Whoops, add one-liner missing from github in last commit (#72)

Specifically, make sure that the header, footer, and tabs are all
shared code so that they look the same and don't need to be
redefined as we add more tab pages.

.env

@@ -4,6 +4,7 @@ BASE_URL=null
 CREDENTIALS_BASE_URL=null
 CSRF_TOKEN_API_PATH=null
 ECOMMERCE_BASE_URL=null
+INSIGHTS_BASE_URL=
 LANGUAGE_PREFERENCE_COOKIE_NAME=null
 LMS_BASE_URL=null
 LOGIN_URL=null
@@ -13,4 +14,5 @@ ORDER_HISTORY_URL=null
 REFRESH_ACCESS_TOKEN_ENDPOINT=null
 SEGMENT_KEY=null
 SITE_NAME=null
+STUDIO_BASE_URL=
 USER_INFO_COOKIE_NAME=null

.env.development

@@ -1,5 +1,4 @@
 NODE_ENV='development'
-PORT=2000
 ACCESS_TOKEN_COOKIE_NAME='edx-jwt-cookie-header-payload'
 BASE_URL='localhost:2000'
 CREDENTIALS_BASE_URL='http://localhost:18150'
@@ -8,10 +7,12 @@ ECOMMERCE_BASE_URL='http://localhost:18130'
 LANGUAGE_PREFERENCE_COOKIE_NAME='openedx-language-preference'
 LMS_BASE_URL='http://localhost:18000'
 LOGIN_URL='http://localhost:18000/login'
-LOGOUT_URL='http://localhost:18000/login'
+LOGOUT_URL='http://localhost:18000/logout'
 MARKETING_SITE_BASE_URL='http://localhost:18000'
 ORDER_HISTORY_URL='localhost:1996/orders'
+PORT=2000
 REFRESH_ACCESS_TOKEN_ENDPOINT='http://localhost:18000/login_refresh'
 SEGMENT_KEY=null
 SITE_NAME='edX'
+STUDIO_BASE_URL='http://localhost:18010'
 USER_INFO_COOKIE_NAME='edx-user-info'

.env.test

@@ -1,15 +1,18 @@
+NODE_ENV='test'
 ACCESS_TOKEN_COOKIE_NAME='edx-jwt-cookie-header-payload'
-BASE_URL='localhost:1995'
+BASE_URL='localhost:2000'
 CREDENTIALS_BASE_URL='http://localhost:18150'
 CSRF_TOKEN_API_PATH='/csrf/api/v1/token'
 ECOMMERCE_BASE_URL='http://localhost:18130'
 LANGUAGE_PREFERENCE_COOKIE_NAME='openedx-language-preference'
 LMS_BASE_URL='http://localhost:18000'
 LOGIN_URL='http://localhost:18000/login'
-LOGOUT_URL='http://localhost:18000/login'
+LOGOUT_URL='http://localhost:18000/logout'
 MARKETING_SITE_BASE_URL='http://localhost:18000'
 ORDER_HISTORY_URL='localhost:1996/orders'
+PORT=2000
 REFRESH_ACCESS_TOKEN_ENDPOINT='http://localhost:18000/login_refresh'
 SEGMENT_KEY=null
 SITE_NAME='edX'
+STUDIO_BASE_URL='http://localhost:18010'
 USER_INFO_COOKIE_NAME='edx-user-info'

docs/decisions/0002-courseware-component-hierarchy.md

@@ -1,21 +0,0 @@
-# Courseware app structure
-
-Currently we have hierarchical courses - they contain sections, subsections, units, and components.
-
-We need data to power each level.
-
-We've made decisions that we're going to re-fetch data at the subsection level under the assumption that
-
-At any given level, you have the following structure:
-
-Parent
-  Container
-    Child
-      Context
-
-    The container belongs to the parent module, and is an opportunity for the parent to decide to load more data necessary to load the Child.  If the parent has what it needs, it may not use a Container.  The Child has an props-only interface.  It does _not_ use contexts or redux from the Parent.  The child may decide to use a Context internally if that's convenient, but that's a decision independent of anything above the Child in the hierarchy.
-
-
-This app uses a "model store" - a normalized representation of our API data.  This data is kept in an Object with entity IDs as keys, and the entities as values.  This allows the application to quickly look up data in the map using only a key.  It also means that if the same entity is used in multiple places, there's only one actual representation of it in the client - anyone who wants to use it effectively maintains a reference to it via it's ID.
-
-There are a few kinds of data in the model store.  Information from the blocks API - courses, chapters, sequences, and units - are stored together by ID.  Into this, we merge course, sequence, and unit metadata from the courses and sequence metadata APIs.

docs/decisions/0002-courseware-page-decisions.md

@@ -0,0 +1,50 @@
+# Courseware Page Decisions
+
+## Courseware data loading
+
+Today we have strictly hierarchical courses - a course contains sections, which contain sequences, which contain units, which contain components.
+
+In creating the courseware pages of this app, we needed to choose how often we fetch data from the server.  If we fetch it once and try to get the whole course, including all the data we need in its entire hierarchy, then the request will take 30+ seconds and be a horrible UX.  If we try to fetch too granularly, we risk making hundreds of calls to the LMS, incuring both request overhead and common server-side processing that needs to occur for each of those requests.
+
+Instead, we've chosen to load data via the following:
+
+- The course blocks API (/api/courses/v2/blocks) for getting the overall structure of the course (limited data on the whole hierarchy)
+- The course metadata API (/api/courseware/course) for detailed top-level data, such as dates, enrollment status, info for tabs across the top of the page, etc.
+- The sequence metadata API (/api/courseware/sequence) for detailed information on a sequence, such as which unit to display, any banner messages, whether or not the sequence has a prerequisite, if it's an exam, etc.
+- The xblock endpoint (http://localhost:18000/xblock/:block_id) which renders HTML for an xBlock by ID, used to render Unit contents.  This HTML is loaded into the application via an iFrame.
+
+These APIs aren't perfect for our usage, but they're getting the job done for now.  They weren't built for our purposes and thus load more information than we strictly need, and aren't as performant as we'd like.  Future milestones of the application may rely on new, more performant APIs (possibly BFFs)
+
+## Unit iframing
+
+We determined, as part of our project discovery, that in order to deliver value to users sooner, we would iframe in content of units.  This allowed us to avoid rebuilding the UI for unit/component xblocks in the micro-frontend, which is a daunting task.  It also allows existing custom xblocks to continue to work for now, as they wouldn't have to be re-written.
+
+A future iteration of the project may go back and pull the unit rendering into the MFE.
+
+## Strictly hierarchical courses
+
+We've also made the assumption that courses are strictly hierarchical - a given section, sequence, or unit doesn't have multiple parents.  This is important, as it allows us to navigate the tree in the client in a deterministic way.  If we need to find out who the parent section of a sequence is, there's only one answer to that question.
+
+## Determining which sequences and units to show
+
+The courseware URL scheme:
+
+`/course/:courseId(/:sequenceId(/:unitId))`
+
+Sequence ID and unit ID are optional.
+
+Today, if the URL only specifies the course ID, we need to pick a sequence to show.  We do this by picking the first sequence of the course (as dictated by the course blocks API) and update the URL to match.  _After_ the URL has been updated, the application will attempt to load that sequence.
+
+Similarly, if the URL doesn't contain a unit ID, we use the `position` field of the sequence to determine which unit we want to display from that sequence.  If the position isn't specified in the sequence, we choose the first unit of the sequence.  After determining which unit to display, we update the URL to match.  After the URL is updated, the application will attempt to load that unit via an iFrame.
+
+## "Container" components vs. display components
+
+This application makes use of a few "container" components at the top level - CoursewareContainer and CourseHomeContainer.
+
+The point of these containers is to introduce a layer of abstraction between the UI representation of the pages and the way their data was loaded, as described above.
+
+We don't want our Course.jsx component to be intimately aware - for example - that it's data is loaded via two separate APIs that are then merged together.  That's not useful information - it just needs to know where it's data is and if it's loaded.  Furthermore, this layer of abstraction lets us normalize field names between the various APIs to let our MFE code be more consistent and readable.  This normalization is done in the src/data/api.js layer.
+
+## Navigation
+
+Course navigation in a hierarchical course happens primarily via the "sequence navigation".  This component lets users navigate to the next and previous unit in the course, and also select specific units within the sequence directly.  The next and previous buttons (SequenceNavigation and UnitNavigation) delegate decision making up the tree to CoursewareContainer.  This is an intentional separation of concerns which should allow different CoursewareContainer-like components to make different decisions about what it means to go to the "next" or "previous" sequence.  This is in support of future course types such as "pathway" courses and adaptive learning sequences.  There is no actual code written for these course types, but it felt like a good separation of concerns.

docs/decisions/0003-course-home-decisions.md

@@ -0,0 +1,7 @@
+# Course Home Decisions
+
+The course home page is not complete as of this writing.
+
+It was added to the MFE as a proof of concept for the Engagement theme's Always Available squad, as they were intending to do some work in the legacy course home page in the LMS, and we wanted to understand whether it would be more easily done in this application.
+
+It uses the same APIs as the courseware page, for the most part.  This may not always be the case, but it is for now.  Differing API shapes may be faster for both pages.

docs/decisions/0004-model-store.md

@@ -0,0 +1,7 @@
+## Model Store
+
+Because we have a variety of models in this app (course, section, sequence, unit), we use a set of generic 'model store' reducers in redux to manage this data.  Once loaded from the APIs, the data is put into the model store by type and by ID, which allows us to quickly access it in the application.  Furthermore, any sub-trees of model children (like "items" in the sequence metadata API) are flattened out and stored by ID in the model-store, and their arrays replaced by arrays of IDs.  This is a recommended way to store data in redux as documented here:
+
+https://redux.js.org/faq/organizing-state#how-do-i-organize-nested-or-duplicate-data-in-my-state
+
+(As an additional data point, djoy has stored data in this format in multiple projects over the years and found it to be very effective)

docs/decisions/0005-components-own-their-loading-state.md

@@ -0,0 +1,17 @@
+# Components Own Their Own Loading State
+
+Currently, the majority of the components in the component tree for both Courseware and CourseHome own their own loading state.  This means that they're _aware_ of the loading status (loading, loaded, failed) of the resources they depend on, and are expected to adjust their own rendering based on that state.
+
+The alternative is for a given component's parent to be responsible for this logic.  Under normal circumstances, if the parents were responsible, it would probably result in simpler code in general.  A component could just take for granted that if it's being rendered, all it's data must be ready.  
+
+*We think that that approach (giving the parents responsibility) isn't appropriate for this application.*
+
+We expect - in the longer term - that different courses/course staff may switch out component implementations.  Use a different form of SequenceNavigation, for instance.  Because of this, we didn't want parent components to be too aware of the nature of their children.  The children are more self-contained this way, though we sacrifice some simplicity for it.
+
+If, for instance, the Sequence component renders a skeleton of the SequenceNavigation, the look of that skeleton is going to be based on an understanding of how the SequenceNavigation renders itself.  If the SequenceNavigation implementation is switched out, that loading code in the Sequence may be wrong/misleading to the user.  If we leave the loading logic in the parent, we then have to branch it for all the types of SequenceNavigations that may exist - this violates the Open/Closed principle by forcing us to update our application when we try to make a new extension/implementation of a sub-component (assuming we have a plugin/extension/component replacement framework in place).
+
+By moving the loading logic into the components themselves, the idea is to allow a given component to render as much of itself as it reasonably can - this may mean just a spinner, or it may mean a "skeleton" UI while the resources are loading.  The parent doesn't need to be aware of the details.
+
+## Under what circumstances would we reverse this decision?
+
+If we find, in time, that we aren't seeing that "switching out component implementations" is a thing that's happening, then we can probably simplify the application code by giving parents the responsibility of deciding when to render their children, rather than keeping that responsibility with the children themselves.  

docs/xblock-links.md

@@ -1,30 +0,0 @@
-# Perf test courses
-
-These courses have some large xblocks and small ones.  One course has many sequences, the other has fewer.
-
-## Big course:  course-v1:MITx+CTL.SC0x+3T2016
-
-- MFE URL: https://learning.edx.org/course/course-v1%3AMITx%2BCTL.SC0x%2B3T2016/0
-- URL: https://courses.edx.org/courses/course-v1:MITx+CTL.SC0x+3T2016/course/
-
-### Small xblock
-- ID: block-v1:MITx+CTL.SC0x+3T2016+type@vertical+block@0586b59f1cf74e3c982f0b9070e7ad33
-- URL: https://courses.edx.org/courses/course-v1:MITx+CTL.SC0x+3T2016/courseware/6a31d02d958e45a398d8a5f1592bdd78/b1ede7bf43c248e19894040718443750/1?activate_block_id=block-v1%3AMITx%2BCTL.SC0x%2B3T2016%2Btype%40vertical%2Bblock%400586b59f1cf74e3c982f0b9070e7ad33
-
-### Big xblock
-- ID: block-v1:MITx+CTL.SC0x+3T2016+type@vertical+block@84d6e785f548431a9e82e58d2df4e971
-- URL: https://courses.edx.org/courses/course-v1:MITx+CTL.SC0x+3T2016/courseware/b77abc02967e401ca615b23dacf8d115/4913db3e36f14ccd8c98c374b9dae809/2?activate_block_id=block-v1%3AMITx%2BCTL.SC0x%2B3T2016%2Btype%40vertical%2Bblock%4084d6e785f548431a9e82e58d2df4e971
-
-## Small course: course-v1:edX+DevSec101+3T2018
-
-- URL: https://courses.edx.org/courses/course-v1:edX+DevSec101+3T2018/course/
-- MFE URL: https://learning.edx.org/course/course-v1%3AedX%2BDevSec101%2B3T2018/0
-
-### Small xblock
-- ID: block-v1:edX+DevSec101+3T2018+type@vertical+block@931f96d1822a4fe5b521fcda19245dca
-- URL: https://courses.edx.org/courses/course-v1:edX+DevSec101+3T2018/courseware/ee898e64bd174e4aba4c07cd2673e5d3/1a37309647814ab8b333c7a17d50abc4/1?activate_block_id=block-v1%3AedX%2BDevSec101%2B3T2018%2Btype%40vertical%2Bblock%40931f96d1822a4fe5b521fcda19245dca
-
-### Big-ish xblock
-
-- ID: block-v1:edX+DevSec101+3T2018+type@vertical+block@d88210fbc2b74ceab167a52def04e2a0
-- URL: https://courses.edx.org/courses/course-v1:edX+DevSec101+3T2018/courseware/b0e2c2b78b5d49308e1454604a255403/38c7049bc8e44d309ab3bdb7f54ae6ae/2?activate_block_id=block-v1%3AedX%2BDevSec101%2B3T2018%2Btype%40vertical%2Bblock%40d88210fbc2b74ceab167a52def04e2a0

openedx.yaml

@@ -3,3 +3,8 @@
 
 oeps: {}
 owner: edx/platform-core-tnl
+openedx-release:
+  # The openedx-release key is described in OEP-10:
+  #   https://open-edx-proposals.readthedocs.io/en/latest/oep-0010-proc-openedx-releases.html
+  # The FAQ might also be helpful: https://openedx.atlassian.net/wiki/spaces/COMM/pages/1331268879/Open+edX+Release+FAQ
+  ref: master

package-lock.json

@@ -2686,15 +2686,15 @@
       }
     },
     "@edx/paragon": {
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-      "resolved": "https://registry.npmjs.org/@edx/paragon/-/paragon-7.2.0.tgz",
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+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/@edx/paragon/-/paragon-7.2.1.tgz",
+      "integrity": "sha512-5TUrMj4Wry0PAFF/uZp8xWBzNOCc6UB4W04NqjmTlJyPRI0fZgKc7+aIQeI6jIHR8GsjTUwUzEMgZ2+aMyCu4A==",
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         "@fortawesome/react-fontawesome": "^0.1.4",
         "airbnb-prop-types": "^2.12.0",
-        "bootstrap": "^4.3.1",
+        "bootstrap": "^4.4.1",
         "classnames": "^2.2.6",
         "email-prop-type": "^3.0.0",
         "font-awesome": "^4.7.0",
@@ -4100,7 +4100,8 @@
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       "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
-      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY="
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
     },
     "array-unique": {
       "version": "0.3.2",
@@ -4109,12 +4110,65 @@
       "dev": true
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     "array.prototype.find": {
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-      "resolved": "https://registry.npmjs.org/array.prototype.find/-/array.prototype.find-2.1.0.tgz",
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+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/array.prototype.find/-/array.prototype.find-2.1.1.tgz",
+      "integrity": "sha512-mi+MYNJYLTx2eNYy+Yh6raoQacCsNeeMUaspFPh9Y141lFSsWxxB8V9mM2ye+eqiRs917J6/pJ4M9ZPzenWckA==",
       "requires": {
         "define-properties": "^1.1.3",
-        "es-abstract": "^1.13.0"
+        "es-abstract": "^1.17.4"
+      },
+      "dependencies": {
+        "es-abstract": {
+          "version": "1.17.5",
+          "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.5.tgz",
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+          "requires": {
+            "es-to-primitive": "^1.2.1",
+            "function-bind": "^1.1.1",
+            "has": "^1.0.3",
+            "has-symbols": "^1.0.1",
+            "is-callable": "^1.1.5",
+            "is-regex": "^1.0.5",
+            "object-inspect": "^1.7.0",
+            "object-keys": "^1.1.1",
+            "object.assign": "^4.1.0",
+            "string.prototype.trimleft": "^2.1.1",
+            "string.prototype.trimright": "^2.1.1"
+          }
+        },
+        "is-callable": {
+          "version": "1.1.5",
+          "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
+          "integrity": "sha512-ESKv5sMCJB2jnHTWZ3O5itG+O128Hsus4K4Qh1h2/cgn2vbgnLSVqfV46AeJA9D5EeeLa9w81KUXMtn34zhX+Q=="
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+          "requires": {
+            "has": "^1.0.3"
+          }
+        },
+        "string.prototype.trimleft": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.2.tgz",
+          "integrity": "sha512-gCA0tza1JBvqr3bfAIFJGqfdRTyPae82+KTnm3coDXkZN9wnuW3HjGgN386D7hfv5CHQYCI022/rJPVlqXyHSw==",
+          "requires": {
+            "define-properties": "^1.1.3",
+            "es-abstract": "^1.17.5",
+            "string.prototype.trimstart": "^1.0.0"
+          }
+        },
+        "string.prototype.trimright": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.2.tgz",
+          "integrity": "sha512-ZNRQ7sY3KroTaYjRS6EbNiiHrOkjihL9aQE/8gfQ4DtAC/aEBRHFJa44OmoWxGGqXuJlfKkZW4WcXErGr+9ZFg==",
+          "requires": {
+            "define-properties": "^1.1.3",
+            "es-abstract": "^1.17.5",
+            "string.prototype.trimend": "^1.0.0"
+          }
+        }
       }
     },
     "array.prototype.flat": {
@@ -6556,9 +6610,9 @@
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+      "resolved": "https://registry.npmjs.org/csstype/-/csstype-2.6.7.tgz",
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@@ -7115,7 +7169,8 @@
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       "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.1.tgz",
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+      "integrity": "sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w==",
+      "dev": true
     },
     "domexception": {
       "version": "1.0.1",
@@ -7130,6 +7185,7 @@
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+      "dev": true,
       "requires": {
         "domelementtype": "1"
       }
@@ -7138,6 +7194,7 @@
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+      "dev": true,
       "requires": {
         "dom-serializer": "0",
         "domelementtype": "1"
@@ -7332,9 +7389,9 @@
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-      "resolved": "https://registry.npmjs.org/email-prop-type/-/email-prop-type-3.0.0.tgz",
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+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/email-prop-type/-/email-prop-type-3.0.1.tgz",
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+      "dev": true,
       "requires": {
         "safe-buffer": "~5.2.0"
       }
@@ -19144,7 +19440,8 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
     },
     "util.promisify": {
       "version": "1.0.0",

package.json

@@ -37,7 +37,7 @@
     "@edx/frontend-component-footer": "^10.0.6",
     "@edx/frontend-component-header": "^2.0.3",
     "@edx/frontend-platform": "^1.3.1",
-    "@edx/paragon": "^7.2.0",
+    "@edx/paragon": "^7.2.1",
     "@fortawesome/fontawesome-svg-core": "^1.2.26",
     "@fortawesome/free-brands-svg-icons": "^5.12.0",
     "@fortawesome/free-regular-svg-icons": "^5.12.0",
@@ -52,7 +52,6 @@
     "react-redux": "^7.1.3",
     "react-router": "^5.1.2",
     "react-router-dom": "^5.1.2",
-    "react-transition-group": "^4.3.0",
     "redux": "^4.0.5",
     "regenerator-runtime": "^0.13.3"
   },

src/CoursewareRedirect.jsx

@@ -0,0 +1,36 @@
+import React from 'react';
+import { Switch, Route, useRouteMatch } from 'react-router';
+import { getConfig } from '@edx/frontend-platform';
+import { FormattedMessage } from '@edx/frontend-platform/i18n';
+import PageLoading from './PageLoading';
+
+export default () => {
+  const { path } = useRouteMatch();
+  return (
+    <div className="flex-grow-1">
+      <PageLoading srMessage={(
+        <FormattedMessage
+          id="learn.redirect.interstitial.message"
+          description="The screen-reader message when a page is about to redirect"
+          defaultMessage="Redirecting..."
+        />
+      )}
+      />
+
+      <Switch>
+        <Route
+          path={`${path}/course-home/:courseId`}
+          render={({ match }) => {
+            global.location.assign(`${getConfig().LMS_BASE_URL}/courses/${match.params.courseId}/course/`);
+          }}
+        />
+        <Route
+          path={`${path}/dashboard`}
+          render={({ location }) => {
+            global.location.assign(`${getConfig().LMS_BASE_URL}/dashboard${location.search}`);
+          }}
+        />
+      </Switch>
+    </div>
+  );
+};

src/PageLoading.jsx

@@ -33,5 +33,5 @@ export default class PageLoading extends Component {
 }
 
 PageLoading.propTypes = {
-  srMessage: PropTypes.string.isRequired,
+  srMessage: PropTypes.node.isRequired,
 };

src/access-expiration-alert/AccessExpirationAlert.jsx

@@ -0,0 +1,21 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+import { Alert } from '../user-messages';
+
+function AccessExpirationAlert(props) {
+  const {
+    rawHtml,
+  } = props;
+  return rawHtml && (
+    <Alert type="info">
+      <div dangerouslySetInnerHTML={{ __html: rawHtml }} />
+    </Alert>
+  );
+}
+
+AccessExpirationAlert.propTypes = {
+  rawHtml: PropTypes.string.isRequired,
+};
+
+export default AccessExpirationAlert;

src/access-expiration-alert/hooks.js

@@ -0,0 +1,28 @@
+/* eslint-disable import/prefer-default-export */
+import { useContext, useState, useEffect } from 'react';
+import { UserMessagesContext } from '../user-messages';
+import { useModel } from '../model-store';
+
+export function useAccessExpirationAlert(courseId) {
+  const course = useModel('courses', courseId);
+  const { add, remove } = useContext(UserMessagesContext);
+  const [alertId, setAlertId] = useState(null);
+  const rawHtml = (course && course.courseExpiredMessage) || null;
+  useEffect(() => {
+    if (rawHtml && alertId === null) {
+      setAlertId(add({
+        code: 'clientAccessExpirationAlert',
+        topic: 'course',
+        rawHtml,
+      }));
+    } else if (!rawHtml && alertId !== null) {
+      remove(alertId);
+      setAlertId(null);
+    }
+    return () => {
+      if (alertId !== null) {
+        remove(alertId);
+      }
+    };
+  }, [alertId, courseId, rawHtml]);
+}

src/access-expiration-alert/index.js

@@ -0,0 +1,2 @@
+export { default as AccessExpirationAlert } from './AccessExpirationAlert';
+export { useAccessExpirationAlert } from './hooks';

src/course-header/CourseTabsNavigation.jsx

@@ -4,28 +4,28 @@ import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
 import classNames from 'classnames';
 
 import messages from './messages';
-import NavTab from './NavTab';
+import Tabs from '../tabs/Tabs';
 
 function CourseTabsNavigation({
-  activeTabSlug, tabs, intl, className,
+  activeTabSlug, className, tabs, intl,
 }) {
-  const courseNavTabs = tabs.map(({ slug, ...courseTab }) => (
-    <NavTab
-      isActive={slug === activeTabSlug}
-      key={slug}
-      {...courseTab}
-    />
-  ));
-
   return (
-    <div className="course-tabs-navigation">
+    <div className={classNames('course-tabs-navigation', className)}>
       <div className="container-fluid">
-        <nav
+        <Tabs
+          className="nav-underline-tabs"
           aria-label={intl.formatMessage(messages['learn.navigation.course.tabs.label'])}
-          className={classNames('nav nav-underline-tabs', className)}
         >
-          {courseNavTabs}
-        </nav>
+          {tabs.map(({ url, title, slug }) => (
+            <a
+              key={slug}
+              className={classNames('nav-item flex-shrink-0 nav-link', { active: slug === activeTabSlug })}
+              href={url}
+            >
+              {title}
+            </a>
+          ))}
+        </Tabs>
       </div>
     </div>
   );

src/course-header/Header.jsx

@@ -4,7 +4,10 @@ import { Dropdown } from '@edx/paragon';
 import { getConfig } from '@edx/frontend-platform';
 import { AppContext } from '@edx/frontend-platform/react';
 
-import logo from './logo.svg';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faUserCircle } from '@fortawesome/free-solid-svg-icons';
+
+import logo from './assets/logo.svg';
 
 function LinkedLogo({
   href,
@@ -25,13 +28,13 @@ LinkedLogo.propTypes = {
   alt: PropTypes.string.isRequired,
 };
 
-export default function CourseHeader({
-  courseOrg, courseNumber, courseName,
+export default function Header({
+  courseOrg, courseNumber, courseTitle,
 }) {
   const { authenticatedUser } = useContext(AppContext);
 
   return (
-    <header>
+    <header className="course-header">
       <div className="container-fluid py-2 d-flex align-items-center ">
         <LinkedLogo
           className="logo"
@@ -39,14 +42,17 @@ export default function CourseHeader({
           src={logo}
           alt={getConfig().SITE_NAME}
         />
-        <div className="flex-grow-1" style={{ lineHeight: 1 }}>
+        <div className="flex-grow-1 course-title-lockup" style={{ lineHeight: 1 }}>
           <span className="d-block small m-0">{courseOrg} {courseNumber}</span>
-          <span className="d-block m-0 font-weight-bold">{courseName}</span>
+          <span className="d-block m-0 font-weight-bold course-title">{courseTitle}</span>
         </div>
 
-        <Dropdown>
+        <Dropdown className="user-dropdown">
           <Dropdown.Button>
-            {authenticatedUser.username}
+            <FontAwesomeIcon icon={faUserCircle} className="d-md-none" size="lg" />
+            <span className="d-none d-md-inline">
+              {authenticatedUser.username}
+            </span>
           </Dropdown.Button>
           <Dropdown.Menu className="dropdown-menu-right">
             <Dropdown.Item href={`${getConfig().LMS_BASE_URL}/dashboard`}>Dashboard</Dropdown.Item>
@@ -61,8 +67,14 @@ export default function CourseHeader({
   );
 }
 
-CourseHeader.propTypes = {
-  courseOrg: PropTypes.string.isRequired,
-  courseNumber: PropTypes.string.isRequired,
-  courseName: PropTypes.string.isRequired,
+Header.propTypes = {
+  courseOrg: PropTypes.string,
+  courseNumber: PropTypes.string,
+  courseTitle: PropTypes.string,
+};
+
+Header.defaultProps = {
+  courseOrg: null,
+  courseNumber: null,
+  courseTitle: null,
 };

src/course-header/index.js

@@ -0,0 +1,2 @@
+export { default as Header } from './Header';
+export { default as CourseTabsNavigation } from './CourseTabsNavigation';

src/course-home/CourseHome.jsx

@@ -0,0 +1,72 @@
+import React from 'react';
+import { useSelector } from 'react-redux';
+import { Button } from '@edx/paragon';
+
+import { AlertList } from '../user-messages';
+
+import CourseDates from './CourseDates';
+import Section from './Section';
+import { useModel } from '../model-store';
+
+// Note that we import from the component files themselves in the enrollment-alert package.
+// This is because Reacy.lazy() requires that we import() from a file with a Component as it's
+// default export.
+// See React.lazy docs here: https://reactjs.org/docs/code-splitting.html#reactlazy
+const { EnrollmentAlert, StaffEnrollmentAlert } = React.lazy(() => import('../enrollment-alert'));
+const LogistrationAlert = React.lazy(() => import('../logistration-alert'));
+
+export default function CourseHome() {
+  const {
+    courseId,
+  } = useSelector(state => state.courseware);
+
+  const {
+    title,
+    start,
+    end,
+    enrollmentStart,
+    enrollmentEnd,
+    enrollmentMode,
+    isEnrolled,
+    sectionIds,
+  } = useModel('courses', courseId);
+
+  return (
+    <>
+      <AlertList
+        topic="outline"
+        className="mb-3"
+        customAlerts={{
+          clientEnrollmentAlert: EnrollmentAlert,
+          clientStaffEnrollmentAlert: StaffEnrollmentAlert,
+          clientLogistrationAlert: LogistrationAlert,
+        }}
+      />
+      <div className="d-flex justify-content-between mb-3">
+        <h2>{title}</h2>
+        <Button className="btn-primary" type="button">Resume Course</Button>
+      </div>
+      <div className="row">
+        <div className="col col-8">
+          {sectionIds.map((sectionId) => (
+            <Section
+              key={sectionId}
+              id={sectionId}
+              courseId={courseId}
+            />
+          ))}
+        </div>
+        <div className="col col-4">
+          <CourseDates
+            start={start}
+            end={end}
+            enrollmentStart={enrollmentStart}
+            enrollmentEnd={enrollmentEnd}
+            enrollmentMode={enrollmentMode}
+            isEnrolled={isEnrolled}
+          />
+        </div>
+      </div>
+    </>
+  );
+}

src/course-home/Section.jsx

@@ -4,10 +4,11 @@ import { Collapsible } from '@edx/paragon';
 import { faChevronRight, faChevronDown } from '@fortawesome/free-solid-svg-icons';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import SequenceLink from './SequenceLink';
-import { courseBlocksShape } from '../data/course-blocks';
+import { useModel } from '../model-store';
 
-export default function Chapter({ id, courseUsageKey, models }) {
-  const { displayName, children } = models[id];
+export default function Section({ id, courseId }) {
+  const section = useModel('sections', id);
+  const { title, sequenceIds } = section;
   return (
     <Collapsible.Advanced className="collapsible-card mb-2">
       <Collapsible.Trigger className="collapsible-trigger d-flex align-items-start">
@@ -21,16 +22,15 @@ export default function Chapter({ id, courseUsageKey, models }) {
             <FontAwesomeIcon icon={faChevronDown} />
           </div>
         </Collapsible.Visible>
-        <div className="ml-2 flex-grow-1">{displayName}</div>
+        <div className="ml-2 flex-grow-1">{title}</div>
       </Collapsible.Trigger>
 
       <Collapsible.Body className="collapsible-body">
-        {children.map((sequenceId) => (
+        {sequenceIds.map((sequenceId) => (
           <SequenceLink
             key={sequenceId}
             id={sequenceId}
-            courseUsageKey={courseUsageKey}
-            models={models}
+            courseId={courseId}
           />
         ))}
       </Collapsible.Body>
@@ -38,8 +38,7 @@ export default function Chapter({ id, courseUsageKey, models }) {
   );
 }
 
-Chapter.propTypes = {
+Section.propTypes = {
   id: PropTypes.string.isRequired,
-  courseUsageKey: PropTypes.string.isRequired,
-  models: courseBlocksShape.isRequired,
+  courseId: PropTypes.string.isRequired,
 };

src/course-home/SequenceLink.jsx

@@ -0,0 +1,18 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Link } from 'react-router-dom';
+import { useModel } from '../model-store';
+
+export default function SequenceLink({ id, courseId }) {
+  const sequence = useModel('sequences', id);
+  return (
+    <div className="ml-4">
+      <Link to={`/course/${courseId}/${id}`}>{sequence.title}</Link>
+    </div>
+  );
+}
+
+SequenceLink.propTypes = {
+  id: PropTypes.string.isRequired,
+  courseId: PropTypes.string.isRequired,
+};

src/course-home/index.js

@@ -0,0 +1 @@
+export { default } from './CourseHome';

src/courseware/CourseContainer.jsx

@@ -1,110 +0,0 @@
-import React, { useEffect } from 'react';
-import PropTypes from 'prop-types';
-import { connect } from 'react-redux';
-import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
-import { history, getConfig } from '@edx/frontend-platform';
-import { fetchCourseMetadata, courseMetadataShape } from '../data/course-meta';
-import { fetchCourseBlocks } from '../data/course-blocks';
-
-import messages from './messages';
-import PageLoading from '../PageLoading';
-import Course from './course/Course';
-
-function CourseContainer(props) {
-  const {
-    intl,
-    match,
-    courseId,
-    blocks: models,
-    metadata,
-  } = props;
-  const {
-    courseUsageKey,
-    sequenceId,
-    unitId,
-  } = match.params;
-
-  useEffect(() => {
-    props.fetchCourseMetadata(courseUsageKey);
-    props.fetchCourseBlocks(courseUsageKey);
-  }, [courseUsageKey]);
-
-  useEffect(() => {
-    if (courseId && !sequenceId) {
-      // TODO: This is temporary until we get an actual activeSequenceId into the course model data.
-      const course = models[courseId];
-      const chapter = models[course.children[0]];
-      const activeSequenceId = chapter.children[0];
-      history.push(`/course/${courseUsageKey}/${activeSequenceId}`);
-    }
-  }, [courseUsageKey, courseId, sequenceId]);
-
-  const metadataLoaded = metadata.fetchState === 'loaded';
-  useEffect(() => {
-    if (metadataLoaded && !metadata.userHasAccess) {
-      global.location.assign(`${getConfig().LMS_BASE_URL}/courses/${courseUsageKey}/course/`);
-    }
-  }, [metadataLoaded]);
-
-  // Whether or not the container is ready to render the Course.
-  const ready = metadataLoaded && courseId && sequenceId;
-
-  return (
-    <main className="flex-grow-1 d-flex flex-column">
-      {ready ? (
-        <Course
-          courseOrg={props.metadata.org}
-          courseNumber={props.metadata.number}
-          courseName={props.metadata.name}
-          courseUsageKey={courseUsageKey}
-          courseId={courseId}
-          isEnrolled={props.metadata.isEnrolled}
-          sequenceId={sequenceId}
-          unitId={unitId}
-          models={models}
-          tabs={props.metadata.tabs}
-          verifiedMode={props.metadata.verifiedMode}
-        />
-      ) : (
-        <PageLoading
-          srMessage={intl.formatMessage(messages['learn.loading.learning.sequence'])}
-        />
-      )}
-    </main>
-  );
-}
-
-CourseContainer.propTypes = {
-  intl: intlShape.isRequired,
-  courseId: PropTypes.string,
-  blocks: PropTypes.objectOf(PropTypes.shape({
-    id: PropTypes.string,
-  })),
-  metadata: courseMetadataShape,
-  fetchCourseMetadata: PropTypes.func.isRequired,
-  fetchCourseBlocks: PropTypes.func.isRequired,
-  match: PropTypes.shape({
-    params: PropTypes.shape({
-      courseUsageKey: PropTypes.string.isRequired,
-      sequenceId: PropTypes.string,
-      unitId: PropTypes.string,
-    }).isRequired,
-  }).isRequired,
-};
-
-CourseContainer.defaultProps = {
-  blocks: {},
-  metadata: undefined,
-  courseId: undefined,
-};
-
-const mapStateToProps = state => ({
-  courseId: state.courseBlocks.root,
-  metadata: state.courseMeta,
-  blocks: state.courseBlocks.blocks,
-});
-
-export default connect(mapStateToProps, {
-  fetchCourseMetadata,
-  fetchCourseBlocks,
-})(injectIntl(CourseContainer));

src/courseware/CoursewareContainer.jsx

@@ -0,0 +1,229 @@
+import React, { useEffect, useCallback } from 'react';
+import PropTypes from 'prop-types';
+import { useSelector, useDispatch } from 'react-redux';
+import { history } from '@edx/frontend-platform';
+import { getLocale } from '@edx/frontend-platform/i18n';
+import { useRouteMatch, Redirect } from 'react-router';
+
+import {
+  fetchCourse,
+  fetchSequence,
+  getResumeBlock,
+} from '../data';
+import {
+  checkBlockCompletion,
+  saveSequencePosition,
+} from './data/thunks';
+import { useModel } from '../model-store';
+import { TabPage } from '../tab-page';
+
+import Course from './course';
+import { sequenceIdsSelector, firstSequenceIdSelector } from './data/selectors';
+
+function useUnitNavigationHandler(courseId, sequenceId, unitId) {
+  const dispatch = useDispatch();
+  return useCallback((nextUnitId) => {
+    dispatch(checkBlockCompletion(courseId, sequenceId, unitId));
+    history.push(`/course/${courseId}/${sequenceId}/${nextUnitId}`);
+  }, [courseId, sequenceId, unitId]);
+}
+
+function usePreviousSequence(sequenceId) {
+  const sequenceIds = useSelector(sequenceIdsSelector);
+  const sequences = useSelector(state => state.models.sequences);
+  if (!sequenceId || sequenceIds.length === 0) {
+    return null;
+  }
+  const sequenceIndex = sequenceIds.indexOf(sequenceId);
+  const previousSequenceId = sequenceIndex > 0 ? sequenceIds[sequenceIndex - 1] : null;
+  return previousSequenceId !== null ? sequences[previousSequenceId] : null;
+}
+
+function useNextSequence(sequenceId) {
+  const sequenceIds = useSelector(sequenceIdsSelector);
+  const sequences = useSelector(state => state.models.sequences);
+  if (!sequenceId || sequenceIds.length === 0) {
+    return null;
+  }
+  const sequenceIndex = sequenceIds.indexOf(sequenceId);
+  const nextSequenceId = sequenceIndex < sequenceIds.length - 1 ? sequenceIds[sequenceIndex + 1] : null;
+  return nextSequenceId !== null ? sequences[nextSequenceId] : null;
+}
+
+
+function useNextSequenceHandler(courseId, sequenceId) {
+  const nextSequence = useNextSequence(sequenceId);
+  const courseStatus = useSelector(state => state.courseware.courseStatus);
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+  return useCallback(() => {
+    if (nextSequence !== null) {
+      if (nextSequence.unitIds.length > 0) {
+        const nextUnitId = nextSequence.unitIds[0];
+        history.push(`/course/${courseId}/${nextSequence.id}/${nextUnitId}`);
+      } else {
+        // Some sequences have no units.  This will show a blank page with prev/next buttons.
+        history.push(`/course/${courseId}/${nextSequence.id}`);
+      }
+    }
+  }, [courseStatus, sequenceStatus, sequenceId]);
+}
+
+function usePreviousSequenceHandler(courseId, sequenceId) {
+  const previousSequence = usePreviousSequence(sequenceId);
+  const courseStatus = useSelector(state => state.courseware.courseStatus);
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+  return useCallback(() => {
+    if (previousSequence !== null) {
+      if (previousSequence.unitIds.length > 0) {
+        const previousUnitId = previousSequence.unitIds[previousSequence.unitIds.length - 1];
+        history.push(`/course/${courseId}/${previousSequence.id}/${previousUnitId}`);
+      } else {
+        // Some sequences have no units.  This will show a blank page with prev/next buttons.
+        history.push(`/course/${courseId}/${previousSequence.id}`);
+      }
+    }
+  }, [courseStatus, sequenceStatus, sequenceId]);
+}
+
+function useExamRedirect(sequenceId) {
+  const sequence = useModel('sequences', sequenceId);
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+  useEffect(() => {
+    if (sequenceStatus === 'loaded' && sequence.isTimeLimited) {
+      global.location.assign(sequence.lmsWebUrl);
+    }
+  }, [sequenceStatus, sequence]);
+}
+
+function useContentRedirect(courseStatus, sequenceStatus) {
+  const match = useRouteMatch();
+  const { courseId, sequenceId, unitId } = match.params;
+  const sequence = useModel('sequences', sequenceId);
+  const firstSequenceId = useSelector(firstSequenceIdSelector);
+  useEffect(() => {
+    if (courseStatus === 'loaded' && !sequenceId) {
+      getResumeBlock(courseId).then((data) => {
+        // This is a replace because we don't want this change saved in the browser's history.
+        if (data.sectionId && data.unitId) {
+          history.replace(`/course/${courseId}/${data.sectionId}/${data.unitId}`);
+        } else {
+          history.replace(`/course/${courseId}/${firstSequenceId}`);
+        }
+      });
+    }
+  }, [courseStatus, sequenceId]);
+
+  useEffect(() => {
+    if (sequenceStatus === 'loaded' && sequenceId && !unitId) {
+      // The position may be null, in which case we'll just assume 0.
+      if (sequence.unitIds !== undefined && sequence.unitIds.length > 0) {
+        const unitIndex = sequence.position || 0;
+        const nextUnitId = sequence.unitIds[unitIndex];
+        // This is a replace because we don't want this change saved in the browser's history.
+        history.replace(`/course/${courseId}/${sequence.id}/${nextUnitId}`);
+      }
+    }
+  }, [sequenceStatus, sequenceId, unitId]);
+}
+
+function useSavedSequencePosition(courseId, sequenceId, unitId) {
+  const dispatch = useDispatch();
+  const sequence = useModel('sequences', sequenceId);
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+  useEffect(() => {
+    if (sequenceStatus === 'loaded' && sequence.savePosition) {
+      const activeUnitIndex = sequence.unitIds.indexOf(unitId);
+      dispatch(saveSequencePosition(courseId, sequenceId, activeUnitIndex));
+    }
+  }, [unitId]);
+}
+
+export default function CoursewareContainer() {
+  const { params } = useRouteMatch();
+  const {
+    courseId: routeCourseUsageKey,
+    sequenceId: routeSequenceId,
+    unitId: routeUnitId,
+  } = params;
+  const dispatch = useDispatch();
+
+  useEffect(() => {
+    dispatch(fetchCourse(routeCourseUsageKey));
+  }, [routeCourseUsageKey]);
+
+  useEffect(() => {
+    if (routeSequenceId) {
+      dispatch(fetchSequence(routeSequenceId));
+    }
+  }, [routeSequenceId]);
+
+  // The courseId and sequenceId in the store are the entities we currently have loaded.
+  // We get these two IDs from the store because until fetchCourse and fetchSequence below have
+  // finished their work, the IDs in the URL are not representative of what we should actually show.
+  // This is important particularly when switching sequences.  Until a new sequence is fully loaded,
+  // there's information that we don't have yet - if we use the URL's sequence ID to tell the app
+  // which sequence is loaded, we'll instantly try to pull it out of the store and use it, before
+  // the sequenceStatus flag has even switched back to "loading", which will put our app into an
+  // invalid state.
+  const {
+    courseId,
+    sequenceId,
+    courseStatus,
+    sequenceStatus,
+  } = useSelector(state => state.courseware);
+
+  const nextSequenceHandler = useNextSequenceHandler(courseId, sequenceId);
+  const previousSequenceHandler = usePreviousSequenceHandler(courseId, sequenceId);
+  const unitNavigationHandler = useUnitNavigationHandler(courseId, sequenceId, routeUnitId);
+
+  useContentRedirect(courseStatus, sequenceStatus);
+  useExamRedirect(sequenceId);
+  useSavedSequencePosition(courseId, sequenceId, routeUnitId);
+
+  const course = useModel('courses', courseId);
+
+  if (courseStatus === 'denied') {
+    switch (course.canLoadCourseware.errorCode) {
+      case 'audit_expired':
+        return <Redirect to={`/redirect/dashboard?access_response_error=${course.canLoadCourseware.additionalContextUserMessage}`} />;
+      case 'course_not_started':
+        // eslint-disable-next-line no-case-declarations
+        const startDate = (new Intl.DateTimeFormat(getLocale())).format(new Date(course.start));
+        return <Redirect to={`/redirect/dashboard?notlive=${startDate}`} />;
+      case 'survey_required': // TODO: Redirect to the course survey
+      case 'unfulfilled_milestones':
+        return <Redirect to="/redirect/dashboard" />;
+      case 'authentication_required':
+      case 'enrollment_required':
+      default:
+        return <Redirect to={`/redirect/course-home/${courseId}`} />;
+    }
+  }
+
+  return (
+    <TabPage
+      activeTabSlug="courseware"
+      courseId={courseId}
+      unitId={routeUnitId}
+    >
+      <Course
+        courseId={courseId}
+        sequenceId={sequenceId}
+        unitId={routeUnitId}
+        nextSequenceHandler={nextSequenceHandler}
+        previousSequenceHandler={previousSequenceHandler}
+        unitNavigationHandler={unitNavigationHandler}
+      />
+    </TabPage>
+  );
+}
+
+CoursewareContainer.propTypes = {
+  match: PropTypes.shape({
+    params: PropTypes.shape({
+      courseId: PropTypes.string.isRequired,
+      sequenceId: PropTypes.string,
+      unitId: PropTypes.string,
+    }).isRequired,
+  }).isRequired,
+};

src/courseware/InstructorToolbar.jsx

@@ -1,46 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-import { connect } from 'react-redux';
-
-function InstructorToolbar(props) {
-  // TODO: Only render this toolbar if the user is course staff
-  if (!props.activeUnitLmsWebUrl) {
-    return null;
-  }
-
-  return (
-    <div className="bg-primary text-light">
-      <div className="container-fluid py-3 d-flex justify-content-end align-items-center">
-        <div>
-          <p className="mb-0 mr-5">
-          You are currently previewing the new learning sequence experience. This preview is to allow for early content testing, especially for custom content blocks, with the goal of ensuring it renders as expected in the next experience. You can learn more through the following <a className="text-white" style={{ textDecoration: 'underline' }} href="https://partners.edx.org/announcements/author-preview-learning-sequence-experience-update" target="blank" rel="noopener">Partner Portal post</a>.  Please report any issues or provide <a className="text-white" style={{ textDecoration: 'underline' }} target="blank" rel="noopener" href="https://forms.gle/R6jMYJNTCj1vgC1D6">feedback using the linked form</a>.
-          </p>
-        </div>
-        <div className="flex-shrink-0">
-          <a className="btn d-block btn-outline-light" href={props.activeUnitLmsWebUrl}>View unit in the existing experience</a>
-        </div>
-      </div>
-    </div>
-  );
-}
-
-InstructorToolbar.propTypes = {
-  activeUnitLmsWebUrl: PropTypes.string,
-};
-
-InstructorToolbar.defaultProps = {
-  activeUnitLmsWebUrl: undefined,
-};
-
-const mapStateToProps = (state, props) => {
-  if (!props.unitId) {
-    return {};
-  }
-
-  const activeUnit = state.courseBlocks.blocks[props.unitId];
-  return {
-    activeUnitLmsWebUrl: activeUnit.lmsWebUrl,
-  };
-};
-
-export default connect(mapStateToProps)(InstructorToolbar);

src/courseware/course/Course.jsx

@@ -1,138 +1,97 @@
-import React, { useCallback } from 'react';
+import React from 'react';
 import PropTypes from 'prop-types';
-import { history } from '@edx/frontend-platform';
+
+import { AlertList } from '../../user-messages';
+import { useAccessExpirationAlert } from '../../access-expiration-alert';
+import { useOfferAlert } from '../../offer-alert';
+
+import Sequence from './sequence';
 
 import CourseBreadcrumbs from './CourseBreadcrumbs';
-import SequenceContainer from './SequenceContainer';
-import { createSequenceIdList } from '../utils';
-import AlertList from '../../user-messages/AlertList';
-import CourseHeader from './CourseHeader';
 import CourseSock from './course-sock';
-import CourseTabsNavigation from './CourseTabsNavigation';
-import InstructorToolbar from '../InstructorToolbar';
-import { useLogistrationAlert, useEnrollmentAlert } from '../../hooks';
+import ContentTools from './tools/ContentTools';
+import { useModel } from '../../model-store';
 
-const EnrollmentAlert = React.lazy(() => import('../../enrollment-alert'));
+// Note that we import from the component files themselves in the enrollment-alert package.
+// This is because Reacy.lazy() requires that we import() from a file with a Component as it's
+// default export.
+// See React.lazy docs here: https://reactjs.org/docs/code-splitting.html#reactlazy
+const AccessExpirationAlert = React.lazy(() => import('../../access-expiration-alert/AccessExpirationAlert'));
+const EnrollmentAlert = React.lazy(() => import('../../enrollment-alert/EnrollmentAlert'));
+const StaffEnrollmentAlert = React.lazy(() => import('../../enrollment-alert/StaffEnrollmentAlert'));
 const LogistrationAlert = React.lazy(() => import('../../logistration-alert'));
+const OfferAlert = React.lazy(() => import('../../offer-alert/OfferAlert'));
 
-
-export default function Course({
+function Course({
   courseId,
-  courseNumber,
-  courseName,
-  courseOrg,
-  courseUsageKey,
-  isEnrolled,
-  models,
   sequenceId,
-  tabs,
   unitId,
-  verifiedMode,
+  nextSequenceHandler,
+  previousSequenceHandler,
+  unitNavigationHandler,
 }) {
-  const nextSequenceHandler = useCallback(() => {
-    const sequenceIds = createSequenceIdList(models, courseId);
-    const currentIndex = sequenceIds.indexOf(sequenceId);
-    if (currentIndex < sequenceIds.length - 1) {
-      const nextSequenceId = sequenceIds[currentIndex + 1];
-      const nextSequence = models[nextSequenceId];
-      const nextUnitId = nextSequence.children[0];
-      history.push(`/course/${courseUsageKey}/${nextSequenceId}/${nextUnitId}`);
-    }
-  });
+  const course = useModel('courses', courseId);
+  const sequence = useModel('sequences', sequenceId);
+  const section = useModel('sections', sequence ? sequence.sectionId : null);
 
-  const previousSequenceHandler = useCallback(() => {
-    const sequenceIds = createSequenceIdList(models, courseId);
-    const currentIndex = sequenceIds.indexOf(sequenceId);
-    if (currentIndex > 0) {
-      const previousSequenceId = sequenceIds[currentIndex - 1];
-      const previousSequence = models[previousSequenceId];
-      const previousUnitId = previousSequence.children[previousSequence.children.length - 1];
-      history.push(`/course/${courseUsageKey}/${previousSequenceId}/${previousUnitId}`);
-    }
-  });
+  useOfferAlert(courseId);
+  useAccessExpirationAlert(courseId);
 
-  useLogistrationAlert();
-  useEnrollmentAlert(isEnrolled);
+  const {
+    canShowUpgradeSock,
+    verifiedMode,
+  } = course;
 
   return (
     <>
-      <CourseHeader
-        courseOrg={courseOrg}
-        courseNumber={courseNumber}
-        courseName={courseName}
+      <AlertList
+        className="my-3"
+        topic="course"
+        customAlerts={{
+          clientEnrollmentAlert: EnrollmentAlert,
+          clientStaffEnrollmentAlert: StaffEnrollmentAlert,
+          clientLogistrationAlert: LogistrationAlert,
+          clientAccessExpirationAlert: AccessExpirationAlert,
+          clientOfferAlert: OfferAlert,
+        }}
+        // courseId is provided because EnrollmentAlert and StaffEnrollmentAlert require it.
+        customProps={{
+          courseId,
+        }}
       />
-      <InstructorToolbar
-        courseUsageKey={courseUsageKey}
+      <CourseBreadcrumbs
         courseId={courseId}
+        sectionId={section ? section.id : null}
         sequenceId={sequenceId}
-        unitId={unitId}
       />
-      <CourseTabsNavigation tabs={tabs} activeTabSlug="courseware" />
-      <div className="container-fluid flex-grow-1 d-flex flex-column">
-        <AlertList
-          className="my-3"
-          topic="course"
-          customAlerts={{
-            clientEnrollmentAlert: EnrollmentAlert,
-            clientLogistrationAlert: LogistrationAlert,
-          }}
-        />
-        <CourseBreadcrumbs
-          courseUsageKey={courseUsageKey}
-          courseId={courseId}
-          sequenceId={sequenceId}
-          unitId={unitId}
-          models={models}
-        />
-        <SequenceContainer
-          key={sequenceId}
-          courseUsageKey={courseUsageKey}
-          courseId={courseId}
-          sequenceId={sequenceId}
-          unitId={unitId}
-          models={models}
-          onNext={nextSequenceHandler}
-          onPrevious={previousSequenceHandler}
-        />
-      </div>
-      {verifiedMode && <CourseSock verifiedMode={verifiedMode} />}
+      <AlertList topic="sequence" />
+      <Sequence
+        unitId={unitId}
+        sequenceId={sequenceId}
+        courseId={courseId}
+        unitNavigationHandler={unitNavigationHandler}
+        nextSequenceHandler={nextSequenceHandler}
+        previousSequenceHandler={previousSequenceHandler}
+      />
+      {canShowUpgradeSock && verifiedMode && <CourseSock verifiedMode={verifiedMode} />}
+      <ContentTools course={course} />
     </>
   );
 }
 
 Course.propTypes = {
-  courseOrg: PropTypes.string.isRequired,
-  courseNumber: PropTypes.string.isRequired,
-  courseName: PropTypes.string.isRequired,
-  courseUsageKey: PropTypes.string.isRequired,
-  courseId: PropTypes.string.isRequired,
-  sequenceId: PropTypes.string.isRequired,
+  courseId: PropTypes.string,
+  sequenceId: PropTypes.string,
   unitId: PropTypes.string,
-  isEnrolled: PropTypes.bool,
-  models: PropTypes.objectOf(PropTypes.shape({
-    id: PropTypes.string.isRequired,
-    displayName: PropTypes.string.isRequired,
-    children: PropTypes.arrayOf(PropTypes.string),
-    parentId: PropTypes.string,
-  })).isRequired,
-  tabs: PropTypes.arrayOf(PropTypes.shape({
-    slug: PropTypes.string.isRequired,
-    priority: PropTypes.number.isRequired,
-    title: PropTypes.string.isRequired,
-    type: PropTypes.string.isRequired,
-    url: PropTypes.string.isRequired,
-  })).isRequired,
-  verifiedMode: PropTypes.shape({
-    price: PropTypes.number.isRequired,
-    currency: PropTypes.string.isRequired,
-    currencySymbol: PropTypes.string,
-    sku: PropTypes.string.isRequired,
-    upgradeUrl: PropTypes.string.isRequired,
-  }),
+  nextSequenceHandler: PropTypes.func.isRequired,
+  previousSequenceHandler: PropTypes.func.isRequired,
+  unitNavigationHandler: PropTypes.func.isRequired,
 };
 
 Course.defaultProps = {
-  unitId: undefined,
-  isEnrolled: false,
-  verifiedMode: null,
+  courseId: null,
+  sequenceId: null,
+  unitId: null,
 };
+
+export default Course;

src/courseware/course/CourseBreadcrumb.jsx

@@ -1,20 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-
-export default function CourseBreadcrumb({ url, label }) {
-  return (
-    <React.Fragment key={`${label}-${url}`}>
-      <li className="list-inline-item text-gray-300" role="presentation" aria-label="spacer">
-        /
-      </li>
-      <li className="list-inline-item">
-        <a href={url}>{label}</a>
-      </li>
-    </React.Fragment>
-  );
-}
-
-CourseBreadcrumb.propTypes = {
-  url: PropTypes.string.isRequired,
-  label: PropTypes.string.isRequired,
-};

src/courseware/course/CourseBreadcrumbs.jsx

@@ -4,39 +4,83 @@ import { getConfig } from '@edx/frontend-platform';
 import { FormattedMessage } from '@edx/frontend-platform/i18n';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import { faHome } from '@fortawesome/free-solid-svg-icons';
+import { useSelector } from 'react-redux';
+import { useModel } from '../../model-store';
 
-import CourseBreadcrumb from './CourseBreadcrumb';
+function CourseBreadcrumb({
+  url, children, withSeparator, ...attrs
+}) {
+  return (
+    <>
+      {withSeparator && (
+        <li className="mx-2 text-gray-300" role="presentation" aria-hidden>/</li>
+      )}
+      <li {...attrs}>
+        <a href={url}>{children}</a>
+      </li>
+    </>
+  );
+}
+
+CourseBreadcrumb.propTypes = {
+  url: PropTypes.string.isRequired,
+  children: PropTypes.node.isRequired,
+  withSeparator: PropTypes.bool,
+};
+
+CourseBreadcrumb.defaultProps = {
+  withSeparator: false,
+};
 
 export default function CourseBreadcrumbs({
-  courseUsageKey, courseId, sequenceId, models,
+  courseId,
+  sectionId,
+  sequenceId,
 }) {
+  const course = useModel('courses', courseId);
+  const sequence = useModel('sequences', sequenceId);
+  const section = useModel('sections', sectionId);
+  const courseStatus = useSelector(state => state.courseware.courseStatus);
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+
   const links = useMemo(() => {
-    const sectionId = models[sequenceId].parentId;
-    return [sectionId, sequenceId].map((nodeId) => {
-      const node = models[nodeId];
-      return {
+    if (courseStatus === 'loaded' && sequenceStatus === 'loaded') {
+      return [section, sequence].filter(node => !!node).map((node) => ({
         id: node.id,
-        label: node.displayName,
-        url: `${getConfig().LMS_BASE_URL}/courses/${courseUsageKey}/course/#${node.id}`,
-      };
-    });
-  }, [courseUsageKey, courseId, sequenceId, models]);
+        label: node.title,
+        url: `${getConfig().LMS_BASE_URL}/courses/${course.id}/course/#${node.id}`,
+      }));
+    }
+    return [];
+  }, [courseStatus, sequenceStatus]);
 
   return (
     <nav aria-label="breadcrumb" className="my-4">
-      <ol className="list-inline m-0">
-        <li className="list-inline-item">
-          <a href={`${getConfig().LMS_BASE_URL}/courses/${courseUsageKey}/course/`}>
-            <FontAwesomeIcon icon={faHome} className="mr-2" />
-            <FormattedMessage
-              id="learn.breadcrumb.navigation.course.home"
-              description="The course home link in breadcrumbs nav"
-              defaultMessage="Course"
-            />
-          </a>
-        </li>
-        {links.map(({ id, url, label }, i) => (
-          <CourseBreadcrumb key={id} url={url} label={label} last={i === links.length - 1} />
+      <ol className="list-unstyled d-flex m-0">
+        <CourseBreadcrumb
+          url={`${getConfig().LMS_BASE_URL}/courses/${course.id}/course/`}
+          className="flex-shrink-0"
+        >
+          <FontAwesomeIcon icon={faHome} className="mr-2" />
+          <FormattedMessage
+            id="learn.breadcrumb.navigation.course.home"
+            description="The course home link in breadcrumbs nav"
+            defaultMessage="Course"
+          />
+        </CourseBreadcrumb>
+        {links.map(({ id, url, label }) => (
+          <CourseBreadcrumb
+            key={id}
+            url={url}
+            withSeparator
+            style={{
+              overflow: 'hidden',
+              textOverflow: 'ellipsis',
+              whiteSpace: 'nowrap',
+            }}
+          >
+            {label}
+          </CourseBreadcrumb>
         ))}
       </ol>
     </nav>
@@ -44,13 +88,12 @@ export default function CourseBreadcrumbs({
 }
 
 CourseBreadcrumbs.propTypes = {
-  courseUsageKey: PropTypes.string.isRequired,
   courseId: PropTypes.string.isRequired,
-  sequenceId: PropTypes.string.isRequired,
-  models: PropTypes.objectOf(PropTypes.shape({
-    id: PropTypes.string.isRequired,
-    displayName: PropTypes.string.isRequired,
-    children: PropTypes.arrayOf(PropTypes.string),
-    parentId: PropTypes.string,
-  })).isRequired,
+  sectionId: PropTypes.string,
+  sequenceId: PropTypes.string,
+};
+
+CourseBreadcrumbs.defaultProps = {
+  sectionId: null,
+  sequenceId: null,
 };

src/courseware/course/InstructorToolbar.jsx

@@ -0,0 +1,94 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { connect } from 'react-redux';
+
+import { getConfig } from '@edx/frontend-platform';
+
+function getInsightsUrl(courseId) {
+  const urlBase = getConfig().INSIGHTS_BASE_URL;
+  let urlFull;
+  if (urlBase) {
+    urlFull = `${urlBase}/courses`;
+    // This shouldn't actually be missing, at present,
+    // but we're providing a reasonable fallback,
+    // in case of either error or extension.
+    if (courseId) {
+      urlFull += `/${courseId}`;
+    }
+  }
+  return urlFull;
+}
+
+function getStudioUrl(courseId, unitId) {
+  const urlBase = getConfig().STUDIO_BASE_URL;
+  let urlFull;
+  if (urlBase) {
+    if (unitId) {
+      urlFull = `${urlBase}/container/${unitId}`;
+    } else if (courseId) {
+      urlFull = `{$urlBase}/course/${courseId}`;
+    }
+  }
+  return urlFull;
+}
+
+function InstructorToolbar(props) {
+  const {
+    courseId,
+    unitId,
+  } = props;
+  const urlInsights = getInsightsUrl(courseId);
+  const urlLms = props.activeUnitLmsWebUrl;
+  const urlStudio = getStudioUrl(courseId, unitId);
+  return (
+    <div className="bg-primary text-light">
+      <div className="container-fluid py-3 d-md-flex justify-content-end align-items-center">
+        <div className="flex-grow-1">
+          &nbsp;
+        </div>
+        {urlLms && (
+          <div className="flex-shrink-0">
+            <a className="btn d-block btn-outline-light" href={urlLms}>View in the existing experience</a>
+          </div>
+        )}
+        &nbsp;
+        {urlStudio && (
+          <div className="flex-shrink-0">
+            <a className="btn d-block btn-outline-light" href={urlStudio}>View in Studio</a>
+          </div>
+        )}
+        &nbsp;
+        {urlInsights && (
+          <div className="flex-shrink-0">
+            <a className="btn d-block btn-outline-light" href={urlInsights}>View in Insights</a>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+InstructorToolbar.propTypes = {
+  activeUnitLmsWebUrl: PropTypes.string,
+  courseId: PropTypes.string,
+  unitId: PropTypes.string,
+};
+
+InstructorToolbar.defaultProps = {
+  activeUnitLmsWebUrl: undefined,
+  courseId: undefined,
+  unitId: undefined,
+};
+
+const mapStateToProps = (state, props) => {
+  if (!props.unitId) {
+    return {};
+  }
+
+  const activeUnit = state.models.units[props.unitId];
+  return {
+    activeUnitLmsWebUrl: activeUnit ? activeUnit.lmsWebUrl : undefined,
+  };
+};
+
+export default connect(mapStateToProps)(InstructorToolbar);

src/courseware/course/Menu.jsx

@@ -1,246 +0,0 @@
-import React, {
-  useState, useCallback, useRef, useEffect,
-} from 'react';
-import { CSSTransition } from 'react-transition-group';
-import PropTypes from 'prop-types';
-
-export function MenuTrigger({ tag, className, ...attributes }) {
-  return React.createElement(tag, {
-    className: `menu-trigger ${className}`,
-    ...attributes,
-  });
-}
-MenuTrigger.propTypes = {
-  tag: PropTypes.string,
-  className: PropTypes.string,
-};
-MenuTrigger.defaultProps = {
-  tag: 'div',
-  className: null,
-};
-const MenuTriggerType = (<MenuTrigger />).type;
-
-export function MenuContent({ tag, className, ...attributes }) {
-  return React.createElement(tag, {
-    className: ['menu-content', className].join(' '),
-    ...attributes,
-  });
-}
-MenuContent.propTypes = {
-  tag: PropTypes.string,
-  className: PropTypes.string,
-};
-MenuContent.defaultProps = {
-  tag: 'div',
-  className: null,
-};
-
-export function Menu({
-  className,
-  children,
-  tag,
-  transitionTimeout,
-  transitionClassName,
-  respondToPointerEvents,
-  onOpen,
-  onClose,
-  closeOnDocumentClick,
-  ...attributes
-}) {
-  const [expanded, setExpanded] = useState(false);
-  const menu = useRef(null);
-
-  const open = useCallback(() => {
-    if (onOpen) {
-      onOpen();
-    }
-    setExpanded(true);
-  }, [onOpen]);
-
-  const close = useCallback(() => {
-    if (onClose) {
-      onClose();
-    }
-    setExpanded(false);
-  }, [onClose]);
-
-  const toggle = useCallback(() => {
-    if (expanded) {
-      close();
-    } else {
-      open();
-    }
-  }, [expanded]);
-
-  const onDocumentClick = useCallback((e) => {
-    if (!closeOnDocumentClick) {
-      return;
-    }
-
-    const clickIsInMenu = menu.current === e.target || menu.current.contains(e.target);
-    if (clickIsInMenu) {
-      return;
-    }
-
-    close();
-  }, [closeOnDocumentClick]);
-
-  useEffect(() => {
-    if (expanded) {
-      // Listen to touchend and click events to ensure the menu
-    // can be closed on mobile, pointer, and mixed input devices
-      document.addEventListener('touchend', onDocumentClick, true);
-      document.addEventListener('click', onDocumentClick, true);
-    } else {
-      document.removeEventListener('touchend', onDocumentClick, true);
-      document.removeEventListener('click', onDocumentClick, true);
-    }
-    return () => {
-      document.removeEventListener('touchend', onDocumentClick, true);
-      document.removeEventListener('click', onDocumentClick, true);
-    };
-  }, [expanded]);
-
-  const onTriggerClick = useCallback((e) => {
-    // Let the browser follow the link of the trigger if the menu
-    // is already expanded and the trigger has an href attribute
-    if (expanded && e.target.getAttribute('href')) {
-      return;
-    }
-
-    e.preventDefault();
-    toggle();
-  }, []);
-
-  const onMouseEnter = useCallback(() => {
-    if (!respondToPointerEvents) { return; }
-    open();
-  }, [respondToPointerEvents]);
-
-  const onMouseLeave = useCallback(() => {
-    if (!respondToPointerEvents) { return; }
-    close();
-  }, [respondToPointerEvents]);
-
-  const getFocusableElements = useCallback(() => menu.current.querySelectorAll('button:not([disabled]), [href]:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"]):not([disabled])'), []);
-
-  const focusNext = useCallback(() => {
-    const focusableElements = Array.from(getFocusableElements());
-    const activeIndex = focusableElements.indexOf(document.activeElement);
-    const nextIndex = (activeIndex + 1) % focusableElements.length;
-    focusableElements[nextIndex].focus();
-  }, []);
-
-  const focusPrevious = useCallback(() => {
-    const focusableElements = Array.from(getFocusableElements());
-    const activeIndex = focusableElements.indexOf(document.activeElement);
-    const previousIndex = (activeIndex || focusableElements.length) - 1;
-    focusableElements[previousIndex].focus();
-  }, []);
-
-  const onKeyDown = useCallback((e) => {
-    if (!expanded) {
-      return;
-    }
-    switch (e.key) {
-      case 'Escape': {
-        e.preventDefault();
-        e.stopPropagation();
-        getFocusableElements()[0].focus();
-        close();
-        break;
-      }
-      case 'Enter': {
-        // Using focusable elements instead of a ref to the trigger
-        // because Hyperlink and Button can handle refs as functional components
-        if (document.activeElement === getFocusableElements()[0]) {
-          e.preventDefault();
-          toggle();
-        }
-        break;
-      }
-      case 'Tab': {
-        e.preventDefault();
-        if (e.shiftKey) {
-          focusPrevious();
-        } else {
-          focusNext();
-        }
-        break;
-      }
-      case 'ArrowDown': {
-        e.preventDefault();
-        focusNext();
-        break;
-      }
-      case 'ArrowUp': {
-        e.preventDefault();
-        focusPrevious();
-        break;
-      }
-      default:
-    }
-  }, [expanded]);
-
-  useEffect(() => () => {
-    // Call onClose callback when unmounting and open
-    if (expanded && onClose) {
-      onClose();
-    }
-  }, []);
-
-  const wrappedChildren = React.Children.map(children, (child) => {
-    if (child.type === MenuTriggerType) {
-      return React.cloneElement(child, {
-        onClick: onTriggerClick,
-        'aria-haspopup': 'menu',
-        'aria-expanded': expanded,
-      });
-    }
-    return (
-      <CSSTransition
-        in={expanded}
-        timeout={transitionTimeout}
-        classNames={transitionClassName}
-        unmountOnExit
-      >
-        {child}
-      </CSSTransition>
-    );
-  });
-
-  const rootClassName = expanded ? 'menu expanded' : 'menu';
-
-  return React.createElement(tag, {
-    className: `${rootClassName} ${className}`,
-    ref: menu,
-    onKeyDown,
-    onMouseEnter,
-    onMouseLeave,
-    ...attributes,
-  }, wrappedChildren);
-}
-
-
-Menu.propTypes = {
-  tag: PropTypes.string,
-  onClose: PropTypes.func,
-  onOpen: PropTypes.func,
-  closeOnDocumentClick: PropTypes.bool,
-  respondToPointerEvents: PropTypes.bool,
-  className: PropTypes.string,
-  transitionTimeout: PropTypes.number,
-  transitionClassName: PropTypes.string,
-  children: PropTypes.arrayOf(PropTypes.node).isRequired,
-};
-
-Menu.defaultProps = {
-  tag: 'div',
-  className: null,
-  onClose: null,
-  onOpen: null,
-  respondToPointerEvents: false,
-  closeOnDocumentClick: true,
-  transitionTimeout: 250,
-  transitionClassName: 'menu-content',
-};

src/courseware/course/NavTab.jsx

@@ -1,33 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-import classNames from 'classnames';
-import { getConfig } from '@edx/frontend-platform';
-
-
-export default function NavTab(props) {
-  const {
-    isActive, url, title, ...attrs
-  } = props;
-
-  const className = classNames(
-    'nav-item nav-link',
-    { active: isActive },
-    attrs.className,
-  );
-
-  // TODO: We probably don't want to blindly add LMS_BASE_URL here.  I think it's more likely
-  // that the course metadata API should provide us fully qualified URLs.
-  return <a {...attrs} className={className} href={`${getConfig().LMS_BASE_URL}${url}`}>{title}</a>;
-}
-
-NavTab.propTypes = {
-  className: PropTypes.string,
-  isActive: PropTypes.bool,
-  title: PropTypes.string.isRequired,
-  url: PropTypes.string.isRequired,
-};
-
-NavTab.defaultProps = {
-  className: undefined,
-  isActive: false,
-};

src/courseware/course/SequenceContainer.jsx

@@ -1,160 +0,0 @@
-/* eslint-disable no-plusplus */
-import React, { useEffect, useCallback, useMemo } from 'react';
-import PropTypes from 'prop-types';
-import { connect } from 'react-redux';
-import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
-import { history } from '@edx/frontend-platform';
-
-import messages from '../messages';
-import PageLoading from '../../PageLoading';
-import Sequence from '../sequence/Sequence';
-import AlertList from '../../user-messages/AlertList';
-import { fetchSequenceMetadata, checkBlockCompletion, saveSequencePosition } from '../../data/course-blocks';
-
-function SequenceContainer(props) {
-  const {
-    courseUsageKey,
-    courseId,
-    sequenceId,
-    unitId,
-    intl,
-    onNext,
-    onPrevious,
-    fetchState,
-    displayName,
-    showCompletion,
-    isTimeLimited,
-    savePosition,
-    bannerText,
-    gatedContent,
-    position,
-    items,
-    lmsWebUrl,
-  } = props;
-  const loaded = fetchState === 'loaded';
-
-  const unitIds = useMemo(() => items.map(({ id }) => id), [items]);
-
-  useEffect(() => {
-    props.fetchSequenceMetadata(sequenceId);
-  }, [sequenceId]);
-
-  useEffect(() => {
-    if (savePosition) {
-      const activeUnitIndex = unitIds.indexOf(unitId);
-      props.saveSequencePosition(courseUsageKey, sequenceId, activeUnitIndex);
-    }
-  }, [unitId]);
-
-  useEffect(() => {
-    if (loaded && !unitId) {
-      // The position may be null, in which case we'll just assume 0.
-      const unitIndex = position || 0;
-      const nextUnitId = unitIds[unitIndex];
-      history.push(`/course/${courseUsageKey}/${sequenceId}/${nextUnitId}`);
-    }
-  }, [loaded, unitId]);
-
-  const handleUnitNavigation = useCallback((nextUnitId) => {
-    props.checkBlockCompletion(courseUsageKey, sequenceId, unitId);
-    history.push(`/course/${courseUsageKey}/${sequenceId}/${nextUnitId}`);
-  }, [courseUsageKey, sequenceId]);
-
-  // Exam redirect
-  useEffect(() => {
-    if (isTimeLimited) {
-      global.location.href = lmsWebUrl;
-    }
-  }, [isTimeLimited]);
-
-  const isLoading = !loaded || !unitId || isTimeLimited;
-
-  return (
-    <>
-      <AlertList topic="sequence" />
-      <div className="course-content-container">
-        {isLoading ? (
-          <PageLoading
-            srMessage={intl.formatMessage(messages['learn.loading.learning.sequence'])}
-          />
-        ) : (
-          <Sequence
-            id={sequenceId}
-            courseUsageKey={courseUsageKey}
-            courseId={courseId}
-            unitIds={unitIds}
-            displayName={displayName}
-            activeUnitId={unitId}
-            showCompletion={showCompletion}
-            isTimeLimited={isTimeLimited}
-            isGated={gatedContent.gated}
-            savePosition={savePosition}
-            bannerText={bannerText}
-            onNext={onNext}
-            onPrevious={onPrevious}
-            onNavigateUnit={handleUnitNavigation}
-            prerequisite={{
-              id: gatedContent.prereqId,
-              name: gatedContent.gatedSectionName,
-            }}
-          />
-        )}
-      </div>
-    </>
-
-  );
-}
-
-SequenceContainer.propTypes = {
-  onNext: PropTypes.func.isRequired,
-  onPrevious: PropTypes.func.isRequired,
-  courseUsageKey: PropTypes.string.isRequired,
-  courseId: PropTypes.string.isRequired,
-  sequenceId: PropTypes.string.isRequired,
-  unitId: PropTypes.string,
-  intl: intlShape.isRequired,
-  items: PropTypes.arrayOf(PropTypes.shape({
-    id: PropTypes.string,
-  })),
-  gatedContent: PropTypes.shape({
-    gated: PropTypes.bool,
-    gatedSectionName: PropTypes.string,
-    prereqId: PropTypes.string,
-  }),
-  checkBlockCompletion: PropTypes.func.isRequired,
-  fetchSequenceMetadata: PropTypes.func.isRequired,
-  saveSequencePosition: PropTypes.func.isRequired,
-  savePosition: PropTypes.bool,
-  lmsWebUrl: PropTypes.string,
-  position: PropTypes.number,
-  fetchState: PropTypes.string,
-  displayName: PropTypes.string,
-  showCompletion: PropTypes.bool,
-  isTimeLimited: PropTypes.bool,
-  bannerText: PropTypes.string,
-};
-
-SequenceContainer.defaultProps = {
-  unitId: undefined,
-  gatedContent: undefined,
-  showCompletion: false,
-  lmsWebUrl: undefined,
-  position: undefined,
-  fetchState: undefined,
-  displayName: undefined,
-  isTimeLimited: undefined,
-  bannerText: undefined,
-  savePosition: undefined,
-  items: [],
-};
-
-export default connect(
-  (state, props) => ({
-    ...state.courseBlocks.blocks[props.sequenceId],
-  }),
-  {
-    fetchSequenceMetadata,
-    checkBlockCompletion,
-    saveSequencePosition,
-  },
-)(injectIntl(SequenceContainer));

src/courseware/course/bookmark/BookmarkButton.jsx

@@ -1,9 +1,11 @@
-import React from 'react';
+import React, { useCallback } from 'react';
 import PropTypes from 'prop-types';
 import { StatefulButton } from '@edx/paragon';
 import { FormattedMessage } from '@edx/frontend-platform/i18n';
+import { useDispatch } from 'react-redux';
 import BookmarkOutlineIcon from './BookmarkOutlineIcon';
 import BookmarkFilledIcon from './BookmarkFilledIcon';
+import { removeBookmark, addBookmark } from './data/thunks';
 
 const addBookmarkLabel = (
   <FormattedMessage
@@ -21,14 +23,25 @@ const hasBookmarkLabel = (
   />
 );
 
-export default function BookmarkButton({ onClick, isBookmarked, isProcessing }) {
+export default function BookmarkButton({
+  isBookmarked, isProcessing, unitId,
+}) {
   const bookmarkState = isBookmarked ? 'bookmarked' : 'default';
   const state = isProcessing ? `${bookmarkState}Processing` : bookmarkState;
 
+  const dispatch = useDispatch();
+  const toggleBookmark = useCallback(() => {
+    if (isBookmarked) {
+      dispatch(removeBookmark(unitId));
+    } else {
+      dispatch(addBookmark(unitId));
+    }
+  }, [isBookmarked, unitId]);
+
   return (
     <StatefulButton
       className="btn-link px-1 ml-n1 btn-sm"
-      onClick={onClick}
+      onClick={toggleBookmark}
       state={state}
       disabledStates={['defaultProcessing', 'bookmarkedProcessing']}
       labels={{
@@ -48,7 +61,11 @@ export default function BookmarkButton({ onClick, isBookmarked, isProcessing })
 }
 
 BookmarkButton.propTypes = {
-  onClick: PropTypes.func.isRequired,
-  isBookmarked: PropTypes.bool.isRequired,
+  unitId: PropTypes.string.isRequired,
+  isBookmarked: PropTypes.bool,
   isProcessing: PropTypes.bool.isRequired,
 };
+
+BookmarkButton.defaultProps = {
+  isBookmarked: false,
+};

src/courseware/course/bookmark/data/api.js

@@ -0,0 +1,13 @@
+import { getConfig } from '@edx/frontend-platform';
+import { getAuthenticatedHttpClient, getAuthenticatedUser } from '@edx/frontend-platform/auth';
+
+const bookmarksBaseUrl = `${getConfig().LMS_BASE_URL}/api/bookmarks/v1/bookmarks/`;
+
+export async function createBookmark(usageId) {
+  return getAuthenticatedHttpClient().post(bookmarksBaseUrl, { usage_id: usageId });
+}
+
+export async function deleteBookmark(usageId) {
+  const { username } = getAuthenticatedUser();
+  return getAuthenticatedHttpClient().delete(`${bookmarksBaseUrl}${username},${usageId}/`);
+}

src/courseware/course/bookmark/data/thunks.js

@@ -0,0 +1,78 @@
+
+import { logError } from '@edx/frontend-platform/logging';
+import {
+  createBookmark,
+  deleteBookmark,
+} from './api';
+import { updateModel } from '../../../../model-store';
+
+export function addBookmark(unitId) {
+  return async (dispatch) => {
+    // Optimistically update the bookmarked flag.
+    dispatch(updateModel({
+      modelType: 'units',
+      model: {
+        id: unitId,
+        bookmarked: true,
+        bookmarkedUpdateState: 'loading',
+      },
+    }));
+
+    try {
+      await createBookmark(unitId);
+      dispatch(updateModel({
+        modelType: 'units',
+        model: {
+          id: unitId,
+          bookmarked: true,
+          bookmarkedUpdateState: 'loaded',
+        },
+      }));
+    } catch (error) {
+      logError(error);
+      dispatch(updateModel({
+        modelType: 'units',
+        model: {
+          id: unitId,
+          bookmarked: false,
+          bookmarkedUpdateState: 'failed',
+        },
+      }));
+    }
+  };
+}
+
+export function removeBookmark(unitId) {
+  return async (dispatch) => {
+    // Optimistically update the bookmarked flag.
+    dispatch(updateModel({
+      modelType: 'units',
+      model: {
+        id: unitId,
+        bookmarked: false,
+        bookmarkedUpdateState: 'loading',
+      },
+    }));
+    try {
+      await deleteBookmark(unitId);
+      dispatch(updateModel({
+        modelType: 'units',
+        model: {
+          id: unitId,
+          bookmarked: false,
+          bookmarkedUpdateState: 'loaded',
+        },
+      }));
+    } catch (error) {
+      logError(error);
+      dispatch(updateModel({
+        modelType: 'units',
+        model: {
+          id: unitId,
+          bookmarked: true,
+          bookmarkedUpdateState: 'failed',
+        },
+      }));
+    }
+  };
+}

src/courseware/course/bookmark/index.js

@@ -0,0 +1,3 @@
+export { default as BookmarkButton } from './BookmarkButton';
+export { default as BookmarkFilledIcon } from './BookmarkFilledIcon';
+export { default as BookmarkOutlineIcon } from './BookmarkFilledIcon';

src/courseware/course/course-sock/index.jsx

@@ -32,128 +32,152 @@ export default class CourseSock extends Component {
           </button>
         </div>
         {this.state.showUpsell && (
-        <div className="d-flex justify-content-around">
-          <div className="mt-3">
-            <h2 className="font-weight-lighter">
+          <>
+            <h2 className="mt-3 mb-4">
               <FormattedMessage
                 id="coursesock.upsell.verifiedcert"
                 defaultMessage="edX Verified Certificate"
               />
             </h2>
-            <h3>
-              <FormattedMessage
-                id="coursesock.upsell.why"
-                defaultMessage="Why upgrade?"
-              />
-            </h3>
-            <ul>
-              <li><FormattedMessage
-                id="coursesock.upsell.reason1"
-                defaultMessage="Official proof of completion"
-              />
-              </li>
-              <li><FormattedMessage
-                id="coursesock.upsell.reason2"
-                defaultMessage="Easily shareable certificate"
-              />
-              </li>
-              <li><FormattedMessage
-                id="coursesock.upsell.reason3"
-                defaultMessage="Proven motivator to complete the course"
-              />
-              </li>
-              <li><FormattedMessage
-                id="coursesock.upsell.reason4"
-                defaultMessage="Certificate purchases help edX continue to offer free courses"
-              />
-              </li>
-            </ul>
-            <h3><FormattedMessage
-              id="coursesock.upsell.howtitle"
-              defaultMessage="How it works"
-            />
-            </h3>
-            <ul>
-              <li><FormattedMessage
-                id="coursesock.upsell.how1"
-                defaultMessage="Pay the Verified Certificate upgrade fee"
-              />
-              </li>
-              <li><FormattedMessage
-                id="coursesock.upsell.how2"
-                defaultMessage="Verify your identity with a webcam and government-issued ID"
-              />
-              </li>
-              <li><FormattedMessage
-                id="coursesock.upsell.how3"
-                defaultMessage="Study hard and pass the course"
-              />
-              </li>
-              <li><FormattedMessage
-                id="coursesock.upsell.how4"
-                defaultMessage="Share your certificate with friends, employers, and others"
-              />
-              </li>
-            </ul>
-            <h3><FormattedMessage
-              id="coursesock.upsell.storytitle"
-              defaultMessage="edX Learner Stories"
-            />
-            </h3>
-            <div className="d-flex align-items-center my-4">
-              <img style={{ maxWidth: '4rem' }} alt="Christina Fong" src={LearnerQuote1} />
-              <div className="w-50 px-4">
-                <FormattedMessage
-                  id="coursesock.upsell.story1"
-                  defaultMessage="My certificate has helped me showcase my knowledge on my
-                   resume - I feel like this certificate could really help me land
-                   my dream job!"
-                />
-                <br />
-                <strong>&mdash; <FormattedMessage
-                  id="coursesock.upsell.learner"
-                  description="Name of learner"
-                  defaultMessage="{ name }, edX Learner"
-                  values={{ name: 'Christina Fong' }}
-                />
-                </strong>
+            <div className="row flex-row-reverse">
+              <div className="col-md-4 col-lg-6 d-flex flex-column">
+                <div>
+                  <img alt="Example Certificate" src={VerifiedCert} className="d-block img-thumbnail mb-3 ml-md-auto" />
+                </div>
+                <div className="position-relative flex-grow-1 d-flex flex-column justify-content-end align-items-md-end">
+                  <div style={{ position: 'sticky', bottom: '4rem' }}>
+                    <a
+                      href={this.verifiedMode.upgradeUrl}
+                      className="btn btn-success btn-lg btn-upgrade focusable mb-3"
+                      data-creative="original_sock"
+                      data-position="sock"
+                    >
+                      <FormattedMessage
+                        id="coursesock.upsell.upgrade"
+                        defaultMessage="Upgrade ({symbol}{price} {currency})"
+                        values={{
+                          symbol: this.verifiedMode.currencySymbol,
+                          price: this.verifiedMode.price,
+                          currency: this.verifiedMode.currency,
+                        }}
+                      />
+                    </a>
+                  </div>
+                </div>
+              </div>
+              <div className="col-md-8 col-lg-6">
+                <h3 className="h5">
+                  <FormattedMessage
+                    id="coursesock.upsell.why"
+                    defaultMessage="Why upgrade?"
+                  />
+                </h3>
+                <ul>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.reason1"
+                      defaultMessage="Official proof of completion"
+                    />
+                  </li>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.reason2"
+                      defaultMessage="Easily shareable certificate"
+                    />
+                  </li>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.reason3"
+                      defaultMessage="Proven motivator to complete the course"
+                    />
+                  </li>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.reason4"
+                      defaultMessage="Certificate purchases help edX continue to offer free courses"
+                    />
+                  </li>
+                </ul>
+                <h3 className="h5">
+                  <FormattedMessage
+                    id="coursesock.upsell.howtitle"
+                    defaultMessage="How it works"
+                  />
+                </h3>
+                <ul>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.how1"
+                      defaultMessage="Pay the Verified Certificate upgrade fee"
+                    />
+                  </li>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.how2"
+                      defaultMessage="Verify your identity with a webcam and government-issued ID"
+                    />
+                  </li>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.how3"
+                      defaultMessage="Study hard and pass the course"
+                    />
+                  </li>
+                  <li>
+                    <FormattedMessage
+                      id="coursesock.upsell.how4"
+                      defaultMessage="Share your certificate with friends, employers, and others"
+                    />
+                  </li>
+                </ul>
+
+                <h3 className="h5">
+                  <FormattedMessage
+                    id="coursesock.upsell.storytitle"
+                    defaultMessage="edX Learner Stories"
+                  />
+                </h3>
+                <div className="media my-3">
+                  <img className="mr-3" style={{ maxWidth: '4rem' }} alt="Christina Fong" src={LearnerQuote1} />
+                  <div className="media-body">
+                    <FormattedMessage
+                      id="coursesock.upsell.story1"
+                      defaultMessage="My certificate has helped me showcase my knowledge on my
+                      resume - I feel like this certificate could really help me land
+                      my dream job!"
+                    />
+                    <p className="font-weight-bold">
+                      &mdash; <FormattedMessage
+                        id="coursesock.upsell.learner"
+                        description="Name of learner"
+                        defaultMessage="{ name }, edX Learner"
+                        values={{ name: 'Christina Fong' }}
+                      />
+                    </p>
+                  </div>
+                </div>
+                <div className="media my-3">
+                  <img className="mr-3" style={{ maxWidth: '4rem' }} alt="Chery Troell" src={LearnerQuote2} />
+                  <div className="media-body">
+                    <FormattedMessage
+                      id="coursesock.upsell.story2"
+                      defaultMessage="I wanted to include a verified certificate on my resume and my profile to
+                    illustrate that I am working towards this goal I have and that I have
+                    achieved something while I was unemployed."
+                    />
+                    <p className="font-weight-bold">
+                      &mdash; <FormattedMessage
+                        id="coursesock.upsell.learner"
+                        description="Name of learner"
+                        defaultMessage="{ name }, edX Learner"
+                        values={{ name: 'Cheryl Troell' }}
+                      />
+                    </p>
+                  </div>
+                </div>
               </div>
             </div>
-            <div className="d-flex align-items-center my-2">
-              <img style={{ maxWidth: '4rem' }} alt="Chery Troell" src={LearnerQuote2} />
-              <div className="w-50 px-4">
-                <FormattedMessage
-                  id="coursesock.upsell.story2"
-                  defaultMessage="I wanted to include a verified certificate on my resume and my profile to
-                 illustrate that I am working towards this goal I have and that I have
-                 achieved something while I was unemployed."
-                />
-                <br />
-                <strong>&mdash; <FormattedMessage
-                  id="coursesock.upsell.learner"
-                  description="Name of learner"
-                  defaultMessage="{ name }, edX Learner"
-                  values={{ name: 'Cheryl Troell' }}
-                />
-                </strong>
-              </div>
-            </div>
-          </div>
-          <div className="d-flex flex-column justify-content-between">
-            <img alt="Example Certificate" src={VerifiedCert} />
-            <a href={this.verifiedMode.upgradeUrl} className="btn btn-success btn-lg btn-upgrade focusable" data-creative="original_sock" data-position="sock">
-              <FormattedMessage
-                id="coursesock.upsell.upgrade"
-                defaultMessage="Upgrade ({symbol}{price} {currency})"
-                values={{
-                  symbol: this.verifiedMode.currencySymbol,
-                  price: this.verifiedMode.price,
-                  currency: this.verifiedMode.currency,
-                }}
-              />
-            </a>
-          </div>
-        </div>
+          </>
         )}
       </div>
     );

src/courseware/course/index.js

@@ -0,0 +1 @@
+export { default } from './Course';

src/courseware/course/sequence/Sequence.jsx

@@ -0,0 +1,184 @@
+/* eslint-disable no-use-before-define */
+import React, {
+  useEffect, useContext, useState,
+} from 'react';
+import PropTypes from 'prop-types';
+import { sendTrackEvent } from '@edx/frontend-platform/analytics';
+import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+import { useSelector } from 'react-redux';
+
+import PageLoading from '../../../PageLoading';
+import { UserMessagesContext, ALERT_TYPES } from '../../../user-messages';
+import { useModel } from '../../../model-store';
+
+import messages from './messages';
+import { SequenceNavigation, UnitNavigation } from './sequence-navigation';
+import SequenceContent from './SequenceContent';
+
+function Sequence({
+  unitId,
+  sequenceId,
+  courseId,
+  unitNavigationHandler,
+  nextSequenceHandler,
+  previousSequenceHandler,
+  intl,
+}) {
+  const sequence = useModel('sequences', sequenceId);
+  const unit = useModel('units', unitId);
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+  const handleNext = () => {
+    const nextIndex = sequence.unitIds.indexOf(unitId) + 1;
+    if (nextIndex < sequence.unitIds.length) {
+      const newUnitId = sequence.unitIds[nextIndex];
+      handleNavigate(newUnitId);
+    } else {
+      nextSequenceHandler();
+    }
+  };
+
+  const handlePrevious = () => {
+    const previousIndex = sequence.unitIds.indexOf(unitId) - 1;
+    if (previousIndex >= 0) {
+      const newUnitId = sequence.unitIds[previousIndex];
+      handleNavigate(newUnitId);
+    } else {
+      previousSequenceHandler();
+    }
+  };
+
+  const handleNavigate = (destinationUnitId) => {
+    unitNavigationHandler(destinationUnitId);
+  };
+
+  const logEvent = (eventName, widgetPlacement, targetUnitId) => {
+    // Note: tabs are tracked with a 1-indexed position
+    // as opposed to a 0-index used throughout this MFE
+    const currentIndex = sequence.unitIds.length > 0 ? sequence.unitIds.indexOf(unitId) : 0;
+    const payload = {
+      current_tab: currentIndex + 1,
+      id: unitId,
+      tab_count: sequence.unitIds.length,
+      widget_placement: widgetPlacement,
+    };
+    if (targetUnitId) {
+      const targetIndex = sequence.unitIds.indexOf(targetUnitId);
+      payload.target_tab = targetIndex + 1;
+    }
+    sendTrackEvent(eventName, payload);
+  };
+
+  const { add, remove } = useContext(UserMessagesContext);
+  useEffect(() => {
+    let id = null;
+    if (sequenceStatus === 'loaded') {
+      if (sequence.bannerText) {
+        id = add({
+          code: null,
+          dismissible: false,
+          text: sequence.bannerText,
+          type: ALERT_TYPES.INFO,
+          topic: 'sequence',
+        });
+      }
+    }
+    return () => {
+      if (id) {
+        remove(id);
+      }
+    };
+  }, [sequenceStatus, sequence]);
+
+  const [unitHasLoaded, setUnitHasLoaded] = useState(false);
+  const handleUnitLoaded = () => {
+    setUnitHasLoaded(true);
+  };
+  useEffect(() => {
+    if (unit) {
+      setUnitHasLoaded(false);
+    }
+  }, [unit]);
+
+  if (sequenceStatus === 'loading') {
+    return (
+      <PageLoading
+        srMessage={intl.formatMessage(messages['learn.loading.learning.sequence'])}
+      />
+    );
+  }
+
+  const gated = sequence.gatedContent !== undefined && sequence.gatedContent.gated;
+
+  if (sequenceStatus === 'loaded') {
+    return (
+      <div className="sequence-container">
+        <div className="sequence">
+          <SequenceNavigation
+            sequenceId={sequenceId}
+            unitId={unitId}
+            className="mb-4"
+            nextSequenceHandler={() => {
+              logEvent('edx.ui.lms.sequence.next_selected', 'top');
+              handleNext();
+            }}
+            onNavigate={(destinationUnitId) => {
+              logEvent('edx.ui.lms.sequence.tab_selected', 'top', destinationUnitId);
+              handleNavigate(destinationUnitId);
+            }}
+            previousSequenceHandler={() => {
+              logEvent('edx.ui.lms.sequence.previous_selected', 'top');
+              handlePrevious();
+            }}
+          />
+          <div className="unit-container flex-grow-1">
+            <SequenceContent
+              courseId={courseId}
+              gated={gated}
+              sequenceId={sequenceId}
+              unitId={unitId}
+              unitLoadedHandler={handleUnitLoaded}
+            />
+            {unitHasLoaded && (
+              <UnitNavigation
+                sequenceId={sequenceId}
+                unitId={unitId}
+                onClickPrevious={() => {
+                  logEvent('edx.ui.lms.sequence.previous_selected', 'bottom');
+                  handlePrevious();
+                }}
+                onClickNext={() => {
+                  logEvent('edx.ui.lms.sequence.next_selected', 'bottom');
+                  handleNext();
+                }}
+              />
+            )}
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  // sequence status 'failed' and any other unexpected sequence status.
+  return (
+    <p className="text-center py-5 mx-auto" style={{ maxWidth: '30em' }}>
+      {intl.formatMessage(messages['learn.course.load.failure'])}
+    </p>
+  );
+}
+
+Sequence.propTypes = {
+  unitId: PropTypes.string,
+  sequenceId: PropTypes.string,
+  courseId: PropTypes.string.isRequired,
+  unitNavigationHandler: PropTypes.func.isRequired,
+  nextSequenceHandler: PropTypes.func.isRequired,
+  previousSequenceHandler: PropTypes.func.isRequired,
+  intl: intlShape.isRequired,
+};
+
+Sequence.defaultProps = {
+  sequenceId: null,
+  unitId: null,
+};
+
+export default injectIntl(Sequence);

src/courseware/course/sequence/SequenceContent.jsx

@@ -0,0 +1,72 @@
+import React, { Suspense, useEffect } from 'react';
+import PropTypes from 'prop-types';
+import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+import PageLoading from '../../../PageLoading';
+import { useModel } from '../../../model-store';
+
+import messages from './messages';
+import Unit from './Unit';
+
+const ContentLock = React.lazy(() => import('./content-lock'));
+
+function SequenceContent({
+  gated, intl, courseId, sequenceId, unitId, unitLoadedHandler,
+}) {
+  const sequence = useModel('sequences', sequenceId);
+
+  // Go back to the top of the page whenever the unit or sequence changes.
+  useEffect(() => {
+    global.scrollTo(0, 0);
+  }, [sequenceId, unitId]);
+
+  if (gated) {
+    return (
+      <Suspense
+        fallback={(
+          <PageLoading
+            srMessage={intl.formatMessage(messages['learn.loading.content.lock'])}
+          />
+        )}
+      >
+        <ContentLock
+          courseId={courseId}
+          sequenceTitle={sequence.title}
+          prereqSectionName={sequence.gatedContent.gatedSectionName}
+          prereqId={sequence.gatedContent.prereqId}
+        />
+      </Suspense>
+    );
+  }
+
+  if (unitId === null) {
+    return (
+      <div>
+        {intl.formatMessage(messages['learn.sequence.no.content'])}
+      </div>
+    );
+  }
+
+  return (
+    <Unit
+      courseId={courseId}
+      key={unitId}
+      id={unitId}
+      onLoaded={unitLoadedHandler}
+    />
+  );
+}
+
+SequenceContent.propTypes = {
+  gated: PropTypes.bool.isRequired,
+  courseId: PropTypes.string.isRequired,
+  sequenceId: PropTypes.string.isRequired,
+  unitId: PropTypes.string,
+  unitLoadedHandler: PropTypes.func.isRequired,
+  intl: intlShape.isRequired,
+};
+
+SequenceContent.defaultProps = {
+  unitId: null,
+};
+
+export default injectIntl(SequenceContent);

src/courseware/course/sequence/Unit.jsx

@@ -0,0 +1,151 @@
+import React, {
+  Suspense,
+  useEffect,
+  useRef,
+  useState,
+  useLayoutEffect,
+} from 'react';
+import PropTypes from 'prop-types';
+import { getConfig } from '@edx/frontend-platform';
+import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+import messages from './messages';
+import BookmarkButton from '../bookmark/BookmarkButton';
+import { useModel } from '../../../model-store';
+import PageLoading from '../../../PageLoading';
+
+const LockPaywall = React.lazy(() => import('./lock-paywall'));
+
+/**
+ * We discovered an error in Firefox where - upon iframe load - React would cease to call any
+ * useEffect hooks until the user interacts with the page again.  This is particularly confusing
+ * when navigating between sequences, as the UI partially updates leaving the user in a nebulous
+ * state.
+ *
+ * We were able to solve this error by using a layout effect to update some component state, which
+ * executes synchronously on render.  Somehow this forces React to continue it's lifecycle
+ * immediately, rather than waiting for user interaction.  This layout effect could be anywhere in
+ * the parent tree, as far as we can tell - we chose to add a conspicuously 'load bearing' (that's
+ * a joke) one here so it wouldn't be accidentally removed elsewhere.
+ *
+ * If we remove this hook when one of these happens:
+ * 1. React figures out that there's an issue here and fixes a bug.
+ * 2. We cease to use an iframe for unit rendering.
+ * 3. Firefox figures out that there's an issue in their iframe loading and fixes a bug.
+ * 4. We stop supporting Firefox.
+ * 5. An enterprising engineer decides to create a repo that reproduces the problem, submits it to
+ *    Firefox/React for review, and they kindly help us figure out what in the world is happening
+ *    so  we can fix it.
+ *
+ * This hook depends on the unit id just to make sure it re-evaluates whenever the ID changes.  If
+ * we change whether or not the Unit component is re-mounted when the unit ID changes, this may
+ * become important, as this hook will otherwise only evaluate the useLayoutEffect once.
+ */
+function useLoadBearingHook(id) {
+  const setValue = useState(0)[1];
+  useLayoutEffect(() => {
+    setValue(currentValue => currentValue + 1);
+  }, [id]);
+}
+
+function Unit({
+  courseId,
+  onLoaded,
+  id,
+  intl,
+}) {
+  const iframeUrl = `${getConfig().LMS_BASE_URL}/xblock/${id}?show_title=0&show_bookmark_button=0`;
+
+  const [iframeHeight, setIframeHeight] = useState(0);
+  const [hasLoaded, setHasLoaded] = useState(false);
+
+  const unit = useModel('units', id);
+  const course = useModel('courses', courseId);
+  const {
+    contentTypeGatingEnabled,
+    enrollmentMode,
+  } = course;
+
+  // Do not remove this hook.  See function description.
+  useLoadBearingHook(id);
+
+  // We use this ref so that we can hold a reference to the currently active event listener.
+  const messageEventListenerRef = useRef(null);
+  useEffect(() => {
+    function receiveMessage(event) {
+      const { type, payload } = event.data;
+      if (type === 'plugin.resize') {
+        setIframeHeight(payload.height);
+        if (!hasLoaded && iframeHeight === 0 && payload.height > 0) {
+          setHasLoaded(true);
+          if (onLoaded) {
+            onLoaded();
+          }
+        }
+      }
+    }
+    // If we currently have an event listener, remove it.
+    if (messageEventListenerRef.current !== null) {
+      global.removeEventListener('message', messageEventListenerRef.current);
+      messageEventListenerRef.current = null;
+    }
+    // Now add our new receiveMessage handler as the event listener.
+    global.addEventListener('message', receiveMessage);
+    // And then save it to our ref for next time.
+    messageEventListenerRef.current = receiveMessage;
+    // When the component finally unmounts, use the ref to remove the correct handler.
+    return () => global.removeEventListener('message', messageEventListenerRef.current);
+  }, [id, setIframeHeight, hasLoaded, iframeHeight, setHasLoaded, onLoaded]);
+
+  return (
+    <div className="unit">
+      <h2 className="mb-0 h4">{unit.title}</h2>
+      <BookmarkButton
+        unitId={unit.id}
+        isBookmarked={unit.bookmarked}
+        isProcessing={unit.bookmarkedUpdateState === 'loading'}
+      />
+      { contentTypeGatingEnabled && unit.graded && enrollmentMode === 'audit' && (
+        <Suspense
+          fallback={(
+            <PageLoading
+              srMessage={intl.formatMessage(messages['learn.loading.content.lock'])}
+            />
+          )}
+        >
+          <LockPaywall
+            courseId={courseId}
+          />
+        </Suspense>
+      )}
+      {!hasLoaded && (
+        <PageLoading
+          srMessage={intl.formatMessage(messages['learn.loading.learning.sequence'])}
+        />
+      )}
+      <div className="unit-iframe-wrapper">
+        <iframe
+          id="unit-iframe"
+          title={unit.title}
+          src={iframeUrl}
+          allowFullScreen
+          height={iframeHeight}
+          scrolling="no"
+          referrerPolicy="origin"
+        />
+      </div>
+    </div>
+  );
+}
+
+Unit.propTypes = {
+  courseId: PropTypes.string.isRequired,
+  id: PropTypes.string.isRequired,
+  intl: intlShape.isRequired,
+  onLoaded: PropTypes.func,
+};
+
+Unit.defaultProps = {
+  onLoaded: undefined,
+};
+
+export default injectIntl(Unit);

src/courseware/course/sequence/content-lock/ContentLock.jsx

@@ -9,10 +9,10 @@ import { Button } from '@edx/paragon';
 import messages from './messages';
 
 function ContentLock({
-  intl, courseUsageKey, prereqSectionName, prereqId, sectionName,
+  intl, courseId, prereqSectionName, prereqId, sequenceTitle,
 }) {
   const handleClick = useCallback(() => {
-    history.push(`/course/${courseUsageKey}/${prereqId}`);
+    history.push(`/course/${courseId}/${prereqId}`);
   });
 
   return (
@@ -20,7 +20,7 @@ function ContentLock({
       <h3>
         <FontAwesomeIcon icon={faLock} />
         {' '}
-        {sectionName}
+        {sequenceTitle}
       </h3>
       <h4>{intl.formatMessage(messages['learn.contentLock.content.locked'])}</h4>
       <p>
@@ -36,9 +36,9 @@ function ContentLock({
 }
 ContentLock.propTypes = {
   intl: intlShape.isRequired,
-  courseUsageKey: PropTypes.string.isRequired,
+  courseId: PropTypes.string.isRequired,
   prereqSectionName: PropTypes.string.isRequired,
   prereqId: PropTypes.string.isRequired,
-  sectionName: PropTypes.string.isRequired,
+  sequenceTitle: PropTypes.string.isRequired,
 };
 export default injectIntl(ContentLock);

src/courseware/course/sequence/index.js

@@ -0,0 +1 @@
+export { default } from './Sequence';

src/courseware/course/sequence/lock-paywall/LockPaywall.jsx

@@ -0,0 +1,61 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faLock } from '@fortawesome/free-solid-svg-icons';
+import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+
+import messages from './messages';
+import VerifiedCert from './assets/edx-verified-mini-cert.png';
+import { useModel } from '../../../../model-store';
+
+function LockPaywall({
+  intl,
+  courseId,
+}) {
+  const course = useModel('courses', courseId);
+  const {
+    verifiedMode,
+  } = course;
+
+  if (!verifiedMode) {
+    return null;
+  }
+  const {
+    currencySymbol,
+    price,
+    upgradeUrl,
+  } = verifiedMode;
+  return (
+    <div className="border border-gray rounded d-flex justify-content-between mt-2 p-3">
+      <div>
+        <h4 className="font-weight-bold mb-2">
+          <FontAwesomeIcon icon={faLock} className="text-black mr-2 ml-1" style={{ fontSize: '2rem' }} />
+          <span>{intl.formatMessage(messages['learn.lockPaywall.title'])}</span>
+        </h4>
+        <p className="mb-0">
+          <span>{intl.formatMessage(messages['learn.lockPaywall.content'])}</span>
+          &nbsp;
+          <a href={upgradeUrl}>
+            {intl.formatMessage(messages['learn.lockPaywall.upgrade.link'], {
+              currencySymbol,
+              price,
+            })}
+          </a>
+        </p>
+      </div>
+      <div>
+        <img
+          alt={intl.formatMessage(messages['learn.lockPaywall.example.alt'])}
+          src={VerifiedCert}
+          className="border-0"
+          style={{ height: '70px' }}
+        />
+      </div>
+    </div>
+  );
+}
+LockPaywall.propTypes = {
+  intl: intlShape.isRequired,
+  courseId: PropTypes.string.isRequired,
+};
+export default injectIntl(LockPaywall);

src/courseware/course/sequence/lock-paywall/index.js

@@ -0,0 +1 @@
+export { default } from './LockPaywall';

src/courseware/course/sequence/lock-paywall/messages.js

@@ -0,0 +1,26 @@
+import { defineMessages } from '@edx/frontend-platform/i18n';
+
+const messages = defineMessages({
+  'learn.lockPaywall.title': {
+    id: 'learn.lockPaywall.title',
+    defaultMessage: 'Verified Track Access',
+    description: 'Heading for message shown to indicate that a piece of content is unavailable to audit track users.',
+  },
+  'learn.lockPaywall.content': {
+    id: 'learn.lockPaywall.content',
+    defaultMessage: 'Graded assessments are available to Verified Track learners.',
+    description: 'Message shown to indicate that a piece of content is unavailable to audit track users.',
+  },
+  'learn.lockPaywall.upgrade.link': {
+    id: 'learn.lockPaywall.upgrade.link',
+    defaultMessage: 'Upgrade to unlock ({currencySymbol}{price})',
+    description: 'A link users can click that navigates their browser to the upgrade payment page.',
+  },
+  'learn.lockPaywall.example.alt': {
+    id: 'learn.lockPaywall.example.alt',
+    defaultMessage: 'Example Certificate',
+    description: 'Alternate text displayed when the example certificate image cannot be displayed.',
+  },
+});
+
+export default messages;

src/courseware/course/sequence/messages.js

@@ -0,0 +1,26 @@
+import { defineMessages } from '@edx/frontend-platform/i18n';
+
+const messages = defineMessages({
+  'learn.loading.content.lock': {
+    id: 'learn.loading.content.lock',
+    defaultMessage: 'Loading locked content messaging...',
+    description: 'Message shown when an interface about locked content is being loaded',
+  },
+  'learn.loading.learning.sequence': {
+    id: 'learn.loading.learning.sequence',
+    defaultMessage: 'Loading learning sequence...',
+    description: 'Message when learning sequence is being loaded',
+  },
+  'learn.course.load.failure': {
+    id: 'learn.course.load.failure',
+    defaultMessage: 'There was an error loading this course.',
+    description: 'Message when a course fails to load',
+  },
+  'learn.sequence.no.content': {
+    id: 'learn.sequence.no.content',
+    defaultMessage: 'There is no content here.',
+    description: 'Message shown when there is no content to show a user inside a learning sequence.',
+  },
+});
+
+export default messages;

src/courseware/course/sequence/sequence-navigation/SequenceNavigation.jsx

@@ -0,0 +1,84 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Button } from '@edx/paragon';
+import classNames from 'classnames';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faChevronLeft, faChevronRight } from '@fortawesome/free-solid-svg-icons';
+import { FormattedMessage } from '@edx/frontend-platform/i18n';
+
+import { useSelector } from 'react-redux';
+import UnitButton from './UnitButton';
+import SequenceNavigationTabs from './SequenceNavigationTabs';
+import { useSequenceNavigationMetadata } from './hooks';
+import { useModel } from '../../../../model-store';
+
+export default function SequenceNavigation({
+  unitId,
+  sequenceId,
+  className,
+  onNavigate,
+  nextSequenceHandler,
+  previousSequenceHandler,
+}) {
+  const sequence = useModel('sequences', sequenceId);
+  const { isFirstUnit, isLastUnit } = useSequenceNavigationMetadata(sequenceId, unitId);
+  const isLocked = sequence.gatedContent !== undefined && sequence.gatedContent.gated;
+  const sequenceStatus = useSelector(state => state.courseware.sequenceStatus);
+
+  const renderUnitButtons = () => {
+    if (isLocked) {
+      return (
+        <UnitButton unitId={unitId} title="" contentType="lock" isActive onClick={() => {}} />
+      );
+    }
+    if (sequence.unitIds.length === 0 || unitId === null) {
+      return (
+        <div style={{ flexBasis: '100%', minWidth: 0, borderBottom: 'solid 1px #EAEAEA' }} />
+      );
+    }
+    return (
+      <SequenceNavigationTabs
+        unitIds={sequence.unitIds}
+        unitId={unitId}
+        showCompletion={sequence.showCompletion}
+        onNavigate={onNavigate}
+      />
+    );
+  };
+
+  return sequenceStatus === 'loaded' && (
+    <nav className={classNames('sequence-navigation', className)}>
+      <Button className="previous-btn" onClick={previousSequenceHandler} disabled={isFirstUnit}>
+        <FontAwesomeIcon icon={faChevronLeft} className="mr-2" size="sm" />
+        <FormattedMessage
+          defaultMessage="Previous"
+          id="learn.sequence.navigation.previous.button"
+          description="The Previous button in the sequence nav"
+        />
+      </Button>
+      {renderUnitButtons()}
+      <Button className="next-btn" onClick={nextSequenceHandler} disabled={isLastUnit}>
+        <FormattedMessage
+          defaultMessage="Next"
+          id="learn.sequence.navigation.next.button"
+          description="The Next button in the sequence nav"
+        />
+        <FontAwesomeIcon icon={faChevronRight} className="ml-2" size="sm" />
+      </Button>
+    </nav>
+  );
+}
+
+SequenceNavigation.propTypes = {
+  sequenceId: PropTypes.string.isRequired,
+  unitId: PropTypes.string,
+  className: PropTypes.string,
+  onNavigate: PropTypes.func.isRequired,
+  nextSequenceHandler: PropTypes.func.isRequired,
+  previousSequenceHandler: PropTypes.func.isRequired,
+};
+
+SequenceNavigation.defaultProps = {
+  className: null,
+  unitId: null,
+};

src/courseware/course/sequence/sequence-navigation/SequenceNavigationDropdown.jsx

@@ -0,0 +1,49 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Dropdown } from '@edx/paragon';
+import { FormattedMessage } from '@edx/frontend-platform/i18n';
+
+import UnitButton from './UnitButton';
+
+export default function SequenceNavigationDropdown({
+  unitId,
+  onNavigate,
+  showCompletion,
+  unitIds,
+}) {
+  return (
+    <Dropdown className="sequence-navigation-dropdown">
+      <Dropdown.Button className="dropdown-button font-weight-normal w-100 border-right-0">
+        <FormattedMessage
+          defaultMessage="{current} of {total}"
+          description="The title of the mobile menu for sequence navigation of units"
+          id="learn.course.sequence.navigation.mobile.menu"
+          values={{
+            current: unitIds.indexOf(unitId) + 1,
+            total: unitIds.length,
+          }}
+        />
+      </Dropdown.Button>
+      <Dropdown.Menu className="w-100">
+        {unitIds.map(buttonUnitId => (
+          <UnitButton
+            className="w-100"
+            isActive={unitId === buttonUnitId}
+            key={buttonUnitId}
+            onClick={onNavigate}
+            showCompletion={showCompletion}
+            showTitle
+            unitId={buttonUnitId}
+          />
+        ))}
+      </Dropdown.Menu>
+    </Dropdown>
+  );
+}
+
+SequenceNavigationDropdown.propTypes = {
+  unitId: PropTypes.string.isRequired,
+  onNavigate: PropTypes.func.isRequired,
+  showCompletion: PropTypes.bool.isRequired,
+  unitIds: PropTypes.arrayOf(PropTypes.string).isRequired,
+};

src/courseware/course/sequence/sequence-navigation/SequenceNavigationTabs.jsx

@@ -0,0 +1,53 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+import UnitButton from './UnitButton';
+import SequenceNavigationDropdown from './SequenceNavigationDropdown';
+import useIndexOfLastVisibleChild from '../../../../tabs/useIndexOfLastVisibleChild';
+
+export default function SequenceNavigationTabs({
+  unitIds, unitId, showCompletion, onNavigate,
+}) {
+  const [
+    indexOfLastVisibleChild,
+    containerRef,
+    invisibleStyle,
+  ] = useIndexOfLastVisibleChild();
+  const shouldDisplayDropdown = indexOfLastVisibleChild === -1;
+
+  return (
+    <div style={{ flexBasis: '100%', minWidth: 0 }}>
+      <div className="sequence-navigation-tabs-container" ref={containerRef}>
+        <div
+          className="sequence-navigation-tabs d-flex flex-grow-1"
+          style={shouldDisplayDropdown ? invisibleStyle : null}
+        >
+          {unitIds.map(buttonUnitId => (
+            <UnitButton
+              key={buttonUnitId}
+              unitId={buttonUnitId}
+              isActive={unitId === buttonUnitId}
+              showCompletion={showCompletion}
+              onClick={onNavigate}
+            />
+          ))}
+        </div>
+      </div>
+      {shouldDisplayDropdown && (
+        <SequenceNavigationDropdown
+          unitId={unitId}
+          onNavigate={onNavigate}
+          showCompletion={showCompletion}
+          unitIds={unitIds}
+        />
+      )}
+    </div>
+  );
+}
+
+SequenceNavigationTabs.propTypes = {
+  unitId: PropTypes.string.isRequired,
+  onNavigate: PropTypes.func.isRequired,
+  showCompletion: PropTypes.bool.isRequired,
+  unitIds: PropTypes.arrayOf(PropTypes.string).isRequired,
+};

src/courseware/course/sequence/sequence-navigation/UnitButton.jsx

@@ -6,17 +6,19 @@ import { Button } from '@edx/paragon';
 
 import UnitIcon from './UnitIcon';
 import CompleteIcon from './CompleteIcon';
-import BookmarkFilledIcon from './bookmark/BookmarkFilledIcon';
+import BookmarkFilledIcon from '../../bookmark/BookmarkFilledIcon';
 
 function UnitButton({
   onClick,
-  displayName,
+  title,
   contentType,
   isActive,
   bookmarked,
   complete,
   showCompletion,
   unitId,
+  className,
+  showTitle,
 }) {
   const handleClick = useCallback(() => {
     onClick(unitId);
@@ -27,11 +29,12 @@ function UnitButton({
       className={classNames({
         active: isActive,
         complete: showCompletion && complete,
-      })}
+      }, className)}
       onClick={handleClick}
-      title={displayName}
+      title={title}
     >
       <UnitIcon type={contentType} />
+      {showTitle && <span className="unit-title">{title}</span>}
       {showCompletion && complete ? <CompleteIcon size="sm" className="text-success ml-2" /> : null}
       {bookmarked ? (
         <BookmarkFilledIcon
@@ -44,25 +47,29 @@ function UnitButton({
 }
 
 UnitButton.propTypes = {
-  unitId: PropTypes.string.isRequired,
-  isActive: PropTypes.bool,
   bookmarked: PropTypes.bool,
+  className: PropTypes.string,
   complete: PropTypes.bool,
-  showCompletion: PropTypes.bool,
-  onClick: PropTypes.func.isRequired,
-  displayName: PropTypes.string.isRequired,
   contentType: PropTypes.string.isRequired,
+  isActive: PropTypes.bool,
+  onClick: PropTypes.func.isRequired,
+  showCompletion: PropTypes.bool,
+  showTitle: PropTypes.bool,
+  title: PropTypes.string.isRequired,
+  unitId: PropTypes.string.isRequired,
 };
 
 UnitButton.defaultProps = {
+  className: undefined,
   isActive: false,
   bookmarked: false,
   complete: false,
+  showTitle: false,
   showCompletion: true,
 };
 
 const mapStateToProps = (state, props) => ({
-  ...state.courseBlocks.blocks[props.unitId],
+  ...state.models.units[props.unitId],
 });
 
 export default connect(mapStateToProps)(UnitButton);

src/courseware/course/sequence/sequence-navigation/UnitNavigation.jsx

@@ -0,0 +1,66 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Button } from '@edx/paragon';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faChevronLeft, faChevronRight } from '@fortawesome/free-solid-svg-icons';
+import { FormattedMessage } from '@edx/frontend-platform/i18n';
+import { useSequenceNavigationMetadata } from './hooks';
+
+export default function UnitNavigation(props) {
+  const {
+    sequenceId,
+    unitId,
+    onClickPrevious,
+    onClickNext,
+  } = props;
+
+  const { isFirstUnit, isLastUnit } = useSequenceNavigationMetadata(sequenceId, unitId);
+
+  return (
+    <div className="unit-navigation d-flex">
+      <Button
+        className="btn-outline-secondary previous-button mr-2"
+        disabled={isFirstUnit}
+        onClick={onClickPrevious}
+      >
+        <FontAwesomeIcon icon={faChevronLeft} className="mr-2" size="sm" />
+        <FormattedMessage
+          id="learn.sequence.navigation.after.unit.previous"
+          description="The button to go to the previous unit"
+          defaultMessage="Previous"
+        />
+      </Button>
+      {isLastUnit ? (
+        <div className="m-2">
+          <span role="img" aria-hidden="true">&#129303;</span> {/* This is a hugging face emoji */}
+          {' '}
+          <FormattedMessage
+            id="learn.end.of.course"
+            description="Message shown to students in place of a 'Next' button when they're at the end of a course."
+            defaultMessage="You've reached the end of this course!"
+          />
+        </div>
+      ) : (
+        <Button
+          className="btn-outline-primary next-button"
+          onClick={onClickNext}
+          disabled={isLastUnit}
+        >
+          <FormattedMessage
+            id="learn.sequence.navigation.after.unit.next"
+            description="The button to go to the next unit"
+            defaultMessage="Next"
+          />
+          <FontAwesomeIcon icon={faChevronRight} className="ml-2" size="sm" />
+        </Button>
+      )}
+    </div>
+  );
+}
+
+UnitNavigation.propTypes = {
+  sequenceId: PropTypes.string.isRequired,
+  unitId: PropTypes.string.isRequired,
+  onClickPrevious: PropTypes.func.isRequired,
+  onClickNext: PropTypes.func.isRequired,
+};

src/courseware/course/sequence/sequence-navigation/hooks.js

@@ -0,0 +1,24 @@
+/* eslint-disable import/prefer-default-export */
+
+import { useSelector } from 'react-redux';
+import { useModel } from '../../../../model-store';
+import { sequenceIdsSelector } from '../../../data/selectors';
+
+export function useSequenceNavigationMetadata(currentSequenceId, currentUnitId) {
+  const sequenceIds = useSelector(sequenceIdsSelector);
+  const sequence = useModel('sequences', currentSequenceId);
+  const courseStatus = useSelector(state => state.courseware.courseStatus);
+
+  // If we don't know the sequence and unit yet, then assume no.
+  if (courseStatus !== 'loaded' || !currentSequenceId || !currentUnitId) {
+    return { isFirstUnit: false, isLastUnit: false };
+  }
+  const isFirstSequence = sequenceIds.indexOf(currentSequenceId) === 0;
+  const isFirstUnitInSequence = sequence.unitIds.indexOf(currentUnitId) === 0;
+  const isFirstUnit = isFirstSequence && isFirstUnitInSequence;
+  const isLastSequence = sequenceIds.indexOf(currentSequenceId) === sequenceIds.length - 1;
+  const isLastUnitInSequence = sequence.unitIds.indexOf(currentUnitId) === sequence.unitIds.length - 1;
+  const isLastUnit = isLastSequence && isLastUnitInSequence;
+
+  return { isFirstUnit, isLastUnit };
+}

src/courseware/course/sequence/sequence-navigation/index.js

@@ -0,0 +1,2 @@
+export { default as SequenceNavigation } from './SequenceNavigation';
+export { default as UnitNavigation } from './UnitNavigation';

src/courseware/course/tools/ContentTools.jsx

@@ -0,0 +1,33 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+import Calculator from './calculator';
+import NotesVisibility from './notes/NotesVisibility';
+import './tools.scss';
+
+export default function ContentTools({
+  course,
+}) {
+  return (
+    <div className="content-tools">
+      <div className="d-flex justify-content-end align-items-end m-0">
+        {course.showCalculator && (
+          <Calculator />
+        )}
+        {course.notes.enabled && (
+          <NotesVisibility course={course} />
+        )}
+      </div>
+    </div>
+  );
+}
+
+
+ContentTools.propTypes = {
+  course: PropTypes.shape({
+    notes: PropTypes.shape({
+      enabled: PropTypes.bool,
+    }),
+    showCalculator: PropTypes.bool,
+  }).isRequired,
+};

src/courseware/course/tools/calculator/calculator.scss

@@ -0,0 +1,7 @@
+.calculator {
+  flex-grow: 1;
+  .calculator-content {
+    background-color: #f1f1f1;
+    box-shadow: 0 -1px 0 0 #ddd;
+  }
+}

src/courseware/course/tools/calculator/index.jsx

@@ -0,0 +1,393 @@
+import React, { Component } from 'react';
+import { Collapsible } from '@edx/paragon';
+import { getConfig } from '@edx/frontend-platform';
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import {
+  FormattedMessage, injectIntl, intlShape,
+} from '@edx/frontend-platform/i18n';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import {
+  faCalculator, faQuestionCircle, faTimesCircle, faEquals,
+} from '@fortawesome/free-solid-svg-icons';
+import messages from './messages';
+import './calculator.scss';
+
+class Calculator extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      equation: '',
+      result: '',
+    };
+    this.handleSubmit = this.handleSubmit.bind(this);
+  }
+
+  async handleSubmit(event) {
+    event.preventDefault();
+    event.stopPropagation();
+    const urlEncoded = new URLSearchParams();
+    urlEncoded.append('equation', this.state.equation);
+
+    const response = await getAuthenticatedHttpClient().get(
+      `${getConfig().LMS_BASE_URL}/calculate?${urlEncoded.toString()}`,
+    );
+    this.setState(() => ({ result: response.data.result }));
+  }
+
+  changeEquation(value) {
+    this.setState(() => ({ equation: value }));
+  }
+
+  render() {
+    return (
+      <Collapsible.Advanced className="calculator">
+        <div className="text-right">
+          <Collapsible.Trigger tag="a" className="trigger btn">
+            <Collapsible.Visible whenOpen>
+              <FontAwesomeIcon icon={faTimesCircle} aria-hidden="true" className="mr-2" />
+            </Collapsible.Visible>
+            <Collapsible.Visible whenClosed>
+              <FontAwesomeIcon icon={faCalculator} aria-hidden="true" className="mr-2" />
+            </Collapsible.Visible>
+            {this.props.intl.formatMessage(messages['calculator.button.label'])}
+          </Collapsible.Trigger>
+        </div>
+        <Collapsible.Body className="calculator-content pt-4">
+          <form onSubmit={this.handleSubmit} className="container-fluid form-inline flex-nowrap">
+            <input
+              type="text"
+              placeholder={this.props.intl.formatMessage(messages['calculator.input.field.label'])}
+              aria-label={this.props.intl.formatMessage(messages['calculator.input.field.label'])}
+              className="form-control w-100"
+              onChange={(event) => this.changeEquation(event.target.value)}
+            />
+            <button
+              className="btn btn-primary mx-3"
+              aria-label={this.props.intl.formatMessage(messages['calculator.submit.button.label'])}
+              type="submit"
+            >
+              <FontAwesomeIcon icon={faEquals} aria-hidden="true" />
+            </button>
+            <input
+              type="text"
+              tabIndex="-1"
+              readOnly
+              aria-live="polite"
+              placeholder={this.props.intl.formatMessage(messages['calculator.result.field.placeholder'])}
+              aria-label={this.props.intl.formatMessage(messages['calculator.result.field.label'])}
+              className="form-control w-50"
+              value={this.state.result}
+            />
+          </form>
+
+          <Collapsible.Advanced>
+            <div className="container-fluid">
+              <Collapsible.Trigger className="btn btn-link btn-sm px-0 d-inline-flex align-items-center">
+                <Collapsible.Visible whenOpen>
+                  <FontAwesomeIcon icon={faTimesCircle} aria-hidden="true" className="mr-2" />
+                </Collapsible.Visible>
+                <Collapsible.Visible whenClosed>
+                  <FontAwesomeIcon icon={faQuestionCircle} aria-hidden="true" className="mr-2" />
+                </Collapsible.Visible>
+                <FormattedMessage
+                  id="calculator.instructions.button.label"
+                  defaultMessage="Calculator Instructions"
+                />
+              </Collapsible.Trigger>
+            </div>
+            <Collapsible.Body className="container-fluid pt-3" style={{ maxHeight: '50vh', overflow: 'auto' }}>
+              <FormattedMessage
+                tagName="h6"
+                id="calculator.instructions"
+                defaultMessage="For detailed information, see {expressions_link} in the {edx_guide}."
+                values={{
+                  expressions_link: (
+                    <a href="https://edx.readthedocs.io/projects/edx-guide-for-students/en/latest/completing_assignments/SFD_mathformatting.html#math-formatting">
+                      <FormattedMessage
+                        id="calculator.instructions.expressions.link.title"
+                        defaultMessage="Entering Mathematical and Scientific Expressions"
+                      />
+                    </a>
+                  ),
+                  edx_guide: (
+                    <a href="https://edx-guide-for-students.readthedocs.io/en/latest/index.html">
+                      <FormattedMessage
+                        id="calculator.instructions.edx.guide.link.title"
+                        defaultMessage="edX Guide for Students"
+                      />
+                    </a>
+                  ),
+                }}
+              />
+              <p>
+                <strong>
+                  <FormattedMessage
+                    id="calculator.instructions.useful.tips"
+                    defaultMessage="Useful tips:"
+                  />
+                </strong>
+              </p>
+              <ul>
+                <li className="hint-item" id="hint-paren">
+                  <FormattedMessage
+                    id="calculator.hint1"
+                    defaultMessage="Use parentheses () to make expressions clear. You can use parentheses inside other parentheses."
+                  />
+                </li>
+                <li className="hint-item" id="hint-spaces">
+                  <FormattedMessage
+                    id="calculator.hint2"
+                    defaultMessage="Do not use spaces in expressions."
+                  />
+                </li>
+                <li className="hint-item" id="hint-howto-constants">
+                  <FormattedMessage
+                    id="calculator.hint3"
+                    defaultMessage="For constants, indicate multiplication explicitly (example: 5*c)."
+                  />
+                </li>
+                <li className="hint-item" id="hint-howto-maffixes">
+                  <FormattedMessage
+                    id="calculator.hint4"
+                    defaultMessage="For affixes, type the number and affix without a space (example: 5c)."
+                  />
+                </li>
+                <li className="hint-item" id="hint-howto-functions">
+                  <FormattedMessage
+                    id="calculator.hint5"
+                    defaultMessage="For functions, type the name of the function, then the expression in parentheses."
+                  />
+                </li>
+              </ul>
+              <table className="table small">
+                <thead>
+                  <tr>
+                    <th scope="col">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.heading"
+                        defaultMessage="To Use"
+                      />
+                    </th>
+                    <th scope="col">
+                      <FormattedMessage
+                        id="calculator.instruction.table.type.heading"
+                        defaultMessage="Type"
+                      />
+                    </th>
+                    <th scope="col">
+                      <FormattedMessage
+                        id="calculator.instruction.table.examples.heading"
+                        defaultMessage="Examples"
+                      />
+                    </th>
+                  </tr>
+                </thead>
+                <tbody>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.numbers"
+                        defaultMessage="Numbers"
+                      />
+                    </th>
+                    <td>
+                      <ul className="list-unstyled m-0">
+                        <li>
+                          <FormattedMessage
+                            id="calculator.instruction.table.to.use.numbers.type1"
+                            defaultMessage="Integers"
+                          />
+                        </li>
+                        <li>
+                          <FormattedMessage
+                            id="calculator.instruction.table.to.use.numbers.type2"
+                            defaultMessage="Fractions"
+                          />
+                        </li>
+                        <li>
+                          <FormattedMessage
+                            id="calculator.instruction.table.to.use.numbers.type3"
+                            defaultMessage="Decimals"
+                          />
+                        </li>
+                      </ul>
+                    </td>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>2520</li>
+                        <li>2/3</li>
+                        <li>3.14, .98</li>
+                      </ul>
+                    </td>
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.operators"
+                        defaultMessage="Operators"
+                      />
+                    </th>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>
+                          {' + - * / '}
+                          <FormattedMessage
+                            id="calculator.instruction.table.to.use.operators.type1"
+                            defaultMessage="(add, subtract, multiply, divide)"
+                          />
+                        </li>
+                        <li>
+                          {'^ '}
+                          <FormattedMessage
+                            id="calculator.instruction.table.to.use.operators.type2"
+                            defaultMessage="(raise to a power)"
+                          />
+                        </li>
+                        <li>
+                          {'|| '}
+                          <FormattedMessage
+                            id="calculator.instruction.table.to.use.operators.type3"
+                            defaultMessage="(parallel resistors)"
+                          />
+                        </li>
+                      </ul>
+                    </td>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>x+(2*y)/x-1</li>
+                        <li>x^(n+1)</li>
+                        <li>v_IN+v_OUT</li>
+                        <li>1||2</li>
+                      </ul>
+                    </td>
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.constants"
+                        defaultMessage="Constants"
+                      />
+                    </th>
+                    <td dir="auto">c, e, g, i, j, k, pi, q, T</td>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>20*c</li>
+                        <li>418*T</li>
+                      </ul>
+                    </td>
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.affixes"
+                        defaultMessage="Affixes"
+                      />
+                    </th>
+                    <td dir="auto">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.affixes.type"
+                        defaultMessage="Percent sign (%) and metric affixes ({affixes})"
+                        values={{
+                          affixes: 'd, c, m, u, n, p, k, M, G, T',
+                        }}
+                      />
+                    </td>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>20%</li>
+                        <li>20c</li>
+                        <li>418T</li>
+                      </ul>
+                    </td>
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.basic.functions"
+                        defaultMessage="Basic functions"
+                      />
+                    </th>
+                    <td dir="auto">abs, exp, fact, factorial, ln, log2, log10, sqrt</td>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>abs(x+y)</li>
+                        <li>sqrt(x^2-y)</li>
+                      </ul>
+                    </td>
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.trig.functions"
+                        defaultMessage="Trigonometric functions"
+                      />
+                    </th>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>sin, cos, tan, sec, csc, cot</li>
+                        <li>arcsin, sinh, arcsinh</li>
+                      </ul>
+                    </td>
+                    <td dir="auto">
+                      <ul className="list-unstyled m-0">
+                        <li>sin(4x+y)</li>
+                        <li>arccsch(4x+y)</li>
+                      </ul>
+                    </td>
+                    <td dir="auto" />
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.scientific.notation"
+                        defaultMessage="Scientific notation"
+                      />
+                    </th>
+                    <td dir="auto">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.scientific.notation.type1"
+                        defaultMessage="{exponentSyntax} and the exponent"
+                        values={{
+                          exponentSyntax: '10^',
+                        }}
+                      />
+                    </td>
+                    <td dir="auto">10^-9</td>
+                  </tr>
+                  <tr>
+                    <th scope="row">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.scientific.notation.type2"
+                        defaultMessage="{notationSyntax} notation"
+                        values={{
+                          notationSyntax: 'e',
+                        }}
+                      />
+                    </th>
+                    <td dir="auto">
+                      <FormattedMessage
+                        id="calculator.instruction.table.to.use.scientific.notation.type3"
+                        defaultMessage="{notationSyntax} and the exponent"
+                        values={{
+                          notationSyntax: '1e',
+                        }}
+                      />
+                    </td>
+                    <td dir="auto">1e-9</td>
+                  </tr>
+                </tbody>
+              </table>
+            </Collapsible.Body>
+          </Collapsible.Advanced>
+        </Collapsible.Body>
+      </Collapsible.Advanced>
+    );
+  }
+}
+
+Calculator.propTypes = {
+  intl: intlShape.isRequired,
+};
+
+
+export default injectIntl(Calculator);

src/courseware/course/tools/calculator/messages.js

@@ -0,0 +1,31 @@
+import { defineMessages } from '@edx/frontend-platform/i18n';
+
+const messages = defineMessages({
+  'calculator.button.label': {
+    id: 'calculator.button.label',
+    defaultMessage: 'Calculator',
+    description: 'Button label to expand or close the calculator',
+  },
+  'calculator.input.field.label': {
+    id: 'calculator.input.field.label',
+    defaultMessage: 'Calculator Input',
+    description: 'label for calculator input',
+  },
+  'calculator.submit.button.label': {
+    id: 'calculator.submit.button.label',
+    defaultMessage: 'Calculate',
+    description: 'Submit button label to execute the calculator',
+  },
+  'calculator.result.field.label': {
+    id: 'calculator.result.field.label',
+    defaultMessage: 'Calculator Result',
+    description: 'label for calculator result',
+  },
+  'calculator.result.field.placeholder': {
+    id: 'calculator.result.field.placeholder',
+    defaultMessage: 'Result',
+    description: 'placeholder for calculator result',
+  },
+});
+
+export default messages;

src/courseware/course/tools/data/api.js

@@ -0,0 +1,6 @@
+import { getConfig } from '@edx/frontend-platform';
+
+export default function toggleNotes() {
+  const iframe = document.getElementById('unit-iframe');
+  iframe.contentWindow.postMessage('tools.toggleNotes', getConfig().LMS_BASE_URL);
+}

src/courseware/course/tools/notes/NotesVisibility.jsx

@@ -0,0 +1,65 @@
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+
+import { getConfig } from '@edx/frontend-platform';
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import {
+  injectIntl, intlShape,
+} from '@edx/frontend-platform/i18n';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faPencilAlt } from '@fortawesome/free-solid-svg-icons';
+import toggleNotes from '../data/api';
+import messages from './messages';
+
+
+class NotesVisibility extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      visible: props.course.notes.visible,
+    };
+    this.visibilityUrl = `${getConfig().LMS_BASE_URL}/courses/${props.course.id}/edxnotes/visibility/`;
+  }
+
+  handleClick = () => {
+    const data = { visibility: this.state.visible };
+    getAuthenticatedHttpClient().put(
+      this.visibilityUrl,
+      data,
+    ).then(() => {
+      this.setState((state) => ({ visible: !state.visible }));
+      toggleNotes();
+    });
+  }
+
+  render() {
+    const message = this.state.visible ? 'notes.button.hide' : 'notes.button.show';
+    return (
+      <button
+        className={`trigger btn ${this.state.visible ? 'text-secondary' : 'text-success'}  mx-2 `}
+        role="switch"
+        type="button"
+        onClick={this.handleClick}
+        onKeyDown={this.handleClick}
+        tabIndex="-1"
+        aria-checked={this.state.visible ? 'true' : 'false'}
+      >
+        <FontAwesomeIcon icon={faPencilAlt} aria-hidden="true" className="mr-2" />
+        {this.props.intl.formatMessage(messages[message])}
+      </button>
+    );
+  }
+}
+
+NotesVisibility.propTypes = {
+  intl: intlShape.isRequired,
+  course: PropTypes.shape({
+    id: PropTypes.string,
+    notes: PropTypes.shape({
+      enabled: PropTypes.bool,
+      visible: PropTypes.bool,
+    }),
+  }).isRequired,
+};
+
+export default injectIntl(NotesVisibility);

src/courseware/course/tools/notes/messages.js

@@ -0,0 +1,16 @@
+import { defineMessages } from '@edx/frontend-platform/i18n';
+
+const messages = defineMessages({
+  'notes.button.show': {
+    id: 'notes.button.show',
+    defaultMessage: 'Show Notes',
+    description: 'Message for toggling notes visibility',
+  },
+  'notes.button.hide': {
+    id: 'notes.button.hide',
+    defaultMessage: 'Hide Notes',
+    description: 'Message for toggling notes visibility',
+  },
+});
+
+export default messages;

src/courseware/course/tools/tools.scss

@@ -0,0 +1,27 @@
+.content-tools {
+  position: fixed;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  z-index: 100;
+  .trigger {
+    cursor: pointer;
+    display: inline-block;
+    position: relative;
+    z-index: 2;
+    background-color: #f1f1f1;
+    border: solid 1px #ddd;
+    border-bottom: none;
+    border-top-left-radius: .3rem;
+    border-top-right-radius: .3rem;
+    border-bottom-left-radius: 0;
+    border-bottom-right-radius: 0;
+    text-overflow: ellipsis;
+    overflow: hidden;
+    padding-left: .75rem;
+    white-space: nowrap;
+    &:before {
+      border-radius: .5rem;
+    }
+  }
+}

src/courseware/data/api.js

@@ -0,0 +1,47 @@
+import { getConfig } from '@edx/frontend-platform';
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+
+const getSequenceXModuleHandlerUrl = (courseId, sequenceId) => `${getConfig().LMS_BASE_URL}/courses/${courseId}/xblock/${sequenceId}/handler/xmodule_handler`;
+
+export async function getBlockCompletion(courseId, sequenceId, usageKey) {
+  // Post data sent to this endpoint must be url encoded
+  // TODO: Remove the need for this to be the case.
+  // TODO: Ensure this usage of URLSearchParams is working in Internet Explorer
+  const urlEncoded = new URLSearchParams();
+  urlEncoded.append('usage_key', usageKey);
+  const requestConfig = {
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+  };
+
+  const { data } = await getAuthenticatedHttpClient().post(
+    `${getSequenceXModuleHandlerUrl(courseId, sequenceId)}/get_completion`,
+    urlEncoded.toString(),
+    requestConfig,
+  );
+
+  if (data.complete) {
+    return true;
+  }
+
+  return false;
+}
+
+export async function updateSequencePosition(courseId, sequenceId, position) {
+  // Post data sent to this endpoint must be url encoded
+  // TODO: Remove the need for this to be the case.
+  // TODO: Ensure this usage of URLSearchParams is working in Internet Explorer
+  const urlEncoded = new URLSearchParams();
+  // Position is 1-indexed on the server and 0-indexed in this app. Adjust here.
+  urlEncoded.append('position', position + 1);
+  const requestConfig = {
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+  };
+
+  const { data } = await getAuthenticatedHttpClient().post(
+    `${getSequenceXModuleHandlerUrl(courseId, sequenceId)}/goto_position`,
+    urlEncoded.toString(),
+    requestConfig,
+  );
+
+  return data;
+}

src/courseware/data/selectors.js

@@ -0,0 +1,25 @@
+/* eslint-disable import/prefer-default-export */
+export function sequenceIdsSelector(state) {
+  if (state.courseware.courseStatus !== 'loaded') {
+    return [];
+  }
+  const { sectionIds = [] } = state.models.courses[state.courseware.courseId];
+
+  const sequenceIds = sectionIds
+    .flatMap(sectionId => state.models.sections[sectionId].sequenceIds);
+
+  return sequenceIds;
+}
+
+export function firstSequenceIdSelector(state) {
+  if (state.courseware.courseStatus !== 'loaded') {
+    return null;
+  }
+  const { sectionIds = [] } = state.models.courses[state.courseware.courseId];
+
+  if (sectionIds.length === 0) {
+    return null;
+  }
+
+  return state.models.sections[sectionIds[0]].sequenceIds[0];
+}

src/courseware/data/thunks.js

@@ -0,0 +1,66 @@
+import { logError } from '@edx/frontend-platform/logging';
+import {
+  getBlockCompletion,
+  updateSequencePosition,
+} from './api';
+import {
+  updateModel,
+} from '../../model-store';
+
+export function checkBlockCompletion(courseId, sequenceId, unitId) {
+  return async (dispatch, getState) => {
+    const { models } = getState();
+    if (models.units[unitId].complete) {
+      return; // do nothing. Things don't get uncompleted after they are completed.
+    }
+
+    try {
+      const isComplete = await getBlockCompletion(courseId, sequenceId, unitId);
+      dispatch(updateModel({
+        modelType: 'units',
+        model: {
+          id: unitId,
+          complete: isComplete,
+        },
+      }));
+    } catch (error) {
+      logError(error);
+    }
+  };
+}
+
+export function saveSequencePosition(courseId, sequenceId, position) {
+  return async (dispatch, getState) => {
+    const { models } = getState();
+    const initialPosition = models.sequences[sequenceId].position;
+    // Optimistically update the position.
+    dispatch(updateModel({
+      modelType: 'sequences',
+      model: {
+        id: sequenceId,
+        position,
+      },
+    }));
+    try {
+      await updateSequencePosition(courseId, sequenceId, position);
+      // Update again under the assumption that the above call succeeded, since it doesn't return a
+      // meaningful response.
+      dispatch(updateModel({
+        modelType: 'sequences',
+        model: {
+          id: sequenceId,
+          position,
+        },
+      }));
+    } catch (error) {
+      logError(error);
+      dispatch(updateModel({
+        modelType: 'sequences',
+        model: {
+          id: sequenceId,
+          position: initialPosition,
+        },
+      }));
+    }
+  };
+}

src/courseware/index.js

@@ -0,0 +1 @@
+export { default } from './CoursewareContainer';

src/courseware/messages.js

@@ -1,11 +1,6 @@
 import { defineMessages } from '@edx/frontend-platform/i18n';
 
 const messages = defineMessages({
-  'learn.loading.learning.sequence': {
-    id: 'learn.loading.learning.sequence',
-    defaultMessage: 'Loading learning sequence...',
-    description: 'Message when learning sequence is being loaded',
-  },
   'learn.loading.error': {
     id: 'learn.loading.error',
     defaultMessage: 'Error: {error}',

src/courseware/sequence/Sequence.jsx

@@ -1,174 +0,0 @@
-/* eslint-disable no-use-before-define */
-import React, {
-  useEffect, useContext, Suspense, useState,
-} from 'react';
-import PropTypes from 'prop-types';
-import { injectIntl, intlShape, FormattedMessage } from '@edx/frontend-platform/i18n';
-import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
-import { faChevronLeft, faChevronRight } from '@fortawesome/free-solid-svg-icons';
-import { Button } from '@edx/paragon';
-
-import Unit from './Unit';
-import SequenceNavigation from './SequenceNavigation';
-import PageLoading from '../../PageLoading';
-import messages from './messages';
-import UserMessagesContext from '../../user-messages/UserMessagesContext';
-
-const ContentLock = React.lazy(() => import('./content-lock'));
-
-function Sequence({
-  courseUsageKey,
-  unitIds,
-  displayName,
-  showCompletion,
-  onNext,
-  onPrevious,
-  onNavigateUnit,
-  isGated,
-  prerequisite,
-  activeUnitId,
-  bannerText,
-  intl,
-}) {
-  const handleNext = () => {
-    const nextIndex = unitIds.indexOf(activeUnitId) + 1;
-    if (nextIndex < unitIds.length) {
-      const newUnitId = unitIds[nextIndex];
-      handleNavigate(newUnitId);
-    } else {
-      onNext();
-    }
-  };
-
-  const handlePrevious = () => {
-    const previousIndex = unitIds.indexOf(activeUnitId) - 1;
-    if (previousIndex >= 0) {
-      const newUnitId = unitIds[previousIndex];
-      handleNavigate(newUnitId);
-    } else {
-      onPrevious();
-    }
-  };
-
-  const handleNavigate = (unitId) => {
-    onNavigateUnit(unitId);
-  };
-
-  const { add, remove } = useContext(UserMessagesContext);
-  useEffect(() => {
-    let id = null;
-    if (bannerText) {
-      id = add({
-        code: null,
-        dismissible: false,
-        text: bannerText,
-        type: 'info',
-        topic: 'sequence',
-      });
-    }
-    return () => {
-      if (id) {
-        remove(id);
-      }
-    };
-  }, [bannerText]);
-
-  const [unitHasLoaded, setUnitHasLoaded] = useState(false);
-  const handleUnitLoaded = () => {
-    setUnitHasLoaded(true);
-  };
-  useEffect(() => {
-    setUnitHasLoaded(false);
-  }, [activeUnitId]);
-
-  return (
-    <>
-      <SequenceNavigation
-        className="mb-4"
-        onNext={handleNext}
-        onNavigate={handleNavigate}
-        onPrevious={handlePrevious}
-        unitIds={unitIds}
-        activeUnitId={activeUnitId}
-        isLocked={isGated}
-        showCompletion={showCompletion}
-      />
-      <div className="flex-grow-1">
-        {isGated && (
-          <Suspense
-            fallback={(
-              <PageLoading
-                srMessage={intl.formatMessage(messages['learn.loading.content.lock'])}
-              />
-            )}
-          >
-            <ContentLock
-              courseUsageKey={courseUsageKey}
-              sectionName={displayName}
-              prereqSectionName={prerequisite.name}
-              prereqId={prerequisite.id}
-            />
-          </Suspense>
-        )}
-        {!isGated && (
-          <Unit
-            key={activeUnitId}
-            id={activeUnitId}
-            onLoaded={handleUnitLoaded}
-          />
-        )}
-      </div>
-      {unitHasLoaded ? (
-        <div className="unit-content-container below-unit-navigation">
-          <Button
-            className="btn-outline-secondary previous-button w-25 mr-2"
-            onClick={handlePrevious}
-          >
-            <FontAwesomeIcon icon={faChevronLeft} className="mr-2" size="sm" />
-            <FormattedMessage
-              id="learn.sequence.navigation.after.unit.previous"
-              description="The button to go to the previous unit"
-              defaultMessage="Previous"
-            />
-          </Button>
-          <Button
-            className="btn-outline-primary next-button w-75"
-            onClick={handleNext}
-          >
-            <FormattedMessage
-              id="learn.sequence.navigation.after.unit.next"
-              description="The button to go to the next unit"
-              defaultMessage="Next"
-            />
-            <FontAwesomeIcon icon={faChevronRight} className="ml-2" size="sm" />
-          </Button>
-        </div>
-      ) : null}
-    </>
-  );
-}
-
-Sequence.propTypes = {
-  activeUnitId: PropTypes.string.isRequired,
-  courseUsageKey: PropTypes.string.isRequired,
-  displayName: PropTypes.string.isRequired,
-  intl: intlShape.isRequired,
-  isGated: PropTypes.bool.isRequired,
-  onNavigateUnit: PropTypes.func,
-  onNext: PropTypes.func.isRequired,
-  onPrevious: PropTypes.func.isRequired,
-  showCompletion: PropTypes.bool.isRequired,
-  prerequisite: PropTypes.shape({
-    name: PropTypes.string,
-    id: PropTypes.string,
-  }).isRequired,
-  unitIds: PropTypes.arrayOf(PropTypes.string).isRequired,
-  bannerText: PropTypes.string,
-};
-
-Sequence.defaultProps = {
-  onNavigateUnit: null,
-  bannerText: undefined,
-};
-
-export default injectIntl(Sequence);

src/courseware/sequence/SequenceNavigation.jsx

@@ -1,69 +0,0 @@
-import React from 'react';
-import PropTypes from 'prop-types';
-import { Button } from '@edx/paragon';
-import classNames from 'classnames';
-import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
-import { faChevronLeft, faChevronRight } from '@fortawesome/free-solid-svg-icons';
-import { FormattedMessage } from '@edx/frontend-platform/i18n';
-
-import UnitButton from './UnitButton';
-
-export default function SequenceNavigation({
-  onNext,
-  onPrevious,
-  onNavigate,
-  unitIds,
-  isLocked,
-  showCompletion,
-  activeUnitId,
-  className,
-}) {
-  const unitButtons = unitIds.map(unitId => (
-    <UnitButton
-      key={unitId}
-      unitId={unitId}
-      isActive={activeUnitId === unitId}
-      showCompletion={showCompletion}
-      onClick={onNavigate}
-    />
-  ));
-
-  return (
-    <nav className={classNames('sequence-navigation', className)}>
-      <Button className="previous-btn" onClick={onPrevious}>
-        <FontAwesomeIcon icon={faChevronLeft} className="mr-2" size="sm" />
-        <FormattedMessage
-          defaultMessage="Previous"
-          id="learn.sequence.navigation.previous.button"
-          description="The Previous button in the sequence nav"
-        />
-      </Button>
-
-      {isLocked ? <UnitButton type="lock" isActive /> : unitButtons}
-
-      <Button className="next-btn" onClick={onNext}>
-        <FormattedMessage
-          defaultMessage="Next"
-          id="learn.sequence.navigation.next.button"
-          description="The Next button in the sequence nav"
-        />
-        <FontAwesomeIcon icon={faChevronRight} className="ml-2" size="sm" />
-      </Button>
-    </nav>
-  );
-}
-
-SequenceNavigation.propTypes = {
-  className: PropTypes.string,
-  onNext: PropTypes.func.isRequired,
-  onPrevious: PropTypes.func.isRequired,
-  onNavigate: PropTypes.func.isRequired,
-  isLocked: PropTypes.bool.isRequired,
-  showCompletion: PropTypes.bool.isRequired,
-  unitIds: PropTypes.arrayOf(PropTypes.string).isRequired,
-  activeUnitId: PropTypes.string.isRequired,
-};
-
-SequenceNavigation.defaultProps = {
-  className: null,
-};

src/courseware/sequence/Unit.jsx

@@ -1,90 +0,0 @@
-import React, { useRef, useEffect, useState } from 'react';
-import PropTypes from 'prop-types';
-import { getConfig } from '@edx/frontend-platform';
-import { connect } from 'react-redux';
-import BookmarkButton from './bookmark/BookmarkButton';
-import { addBookmark, removeBookmark } from '../../data/course-blocks';
-
-function Unit({
-  bookmarked,
-  bookmarkedUpdateState,
-  displayName,
-  onLoaded,
-  id,
-  ...props
-}) {
-  const iframeRef = useRef(null);
-  const iframeUrl = `${getConfig().LMS_BASE_URL}/xblock/${id}?show_title=0&show_bookmark_button=0`;
-
-  const [iframeHeight, setIframeHeight] = useState(0);
-  const [hasLoaded, setHasLoaded] = useState(false);
-  useEffect(() => {
-    global.onmessage = (event) => {
-      const { type, payload } = event.data;
-
-      if (type === 'plugin.resize') {
-        setIframeHeight(payload.height);
-        if (!hasLoaded && iframeHeight === 0 && payload.height > 0) {
-          setHasLoaded(true);
-          if (onLoaded) {
-            onLoaded();
-          }
-        }
-      }
-    };
-  }, []);
-
-  const toggleBookmark = () => {
-    if (bookmarked) {
-      props.removeBookmark(id);
-    } else {
-      props.addBookmark(id);
-    }
-  };
-
-  return (
-    <>
-      <div className="unit-content-container">
-        <h2 className="mb-0 h4">{displayName}</h2>
-        <BookmarkButton
-          onClick={toggleBookmark}
-          isBookmarked={bookmarked}
-          isProcessing={bookmarkedUpdateState === 'loading'}
-        />
-      </div>
-      <iframe
-        id="unit-iframe"
-        title={displayName}
-        ref={iframeRef}
-        src={iframeUrl}
-        allowFullScreen
-        height={iframeHeight}
-        scrolling="no"
-        referrerPolicy="origin"
-      />
-    </>
-  );
-}
-
-Unit.propTypes = {
-  addBookmark: PropTypes.func.isRequired,
-  bookmarked: PropTypes.bool,
-  bookmarkedUpdateState: PropTypes.string,
-  displayName: PropTypes.string.isRequired,
-  id: PropTypes.string.isRequired,
-  removeBookmark: PropTypes.func.isRequired,
-  onLoaded: PropTypes.func,
-};
-
-Unit.defaultProps = {
-  bookmarked: false,
-  bookmarkedUpdateState: undefined,
-  onLoaded: undefined,
-};
-
-const mapStateToProps = (state, props) => state.courseBlocks.blocks[props.id] || {};
-
-export default connect(mapStateToProps, {
-  addBookmark,
-  removeBookmark,
-})(Unit);

src/courseware/sequence/messages.js

@@ -1,11 +0,0 @@
-import { defineMessages } from '@edx/frontend-platform/i18n';
-
-const messages = defineMessages({
-  'learn.loading.content.lock': {
-    id: 'learn.loading.content.lock',
-    defaultMessage: 'Loading locked content messaging...',
-    description: 'Message shown when an interface about locked content is being loaded',
-  },
-});
-
-export default messages;

src/courseware/utils.js

@@ -1,67 +0,0 @@
-/* eslint-disable no-plusplus */
-import { camelCaseObject } from '@edx/frontend-platform';
-
-export function createBlocksMap(blocksData) {
-  const blocks = {};
-  const blocksList = Object.values(blocksData);
-
-  // First go through the list and flesh out our blocks map, camelCasing the objects as we go.
-  for (let i = 0; i < blocksList.length; i++) {
-    const block = blocksList[i];
-    blocks[block.id] = camelCaseObject(block);
-  }
-
-  // Next go through the blocksList again - now that we've added them all to the blocks map - and
-  // append a parent ID to every child found in every `children` list, using the blocks map to find
-  // them.
-  for (let i = 0; i < blocksList.length; i++) {
-    const block = blocksList[i];
-
-    if (Array.isArray(block.children)) {
-      for (let j = 0; j < block.children.length; j++) {
-        const childId = block.children[j];
-        const child = blocks[childId];
-        child.parentId = block.id;
-      }
-    }
-  }
-
-  return blocks;
-}
-
-export function createSequenceIdList(blocks, entryPointId, sequences = []) {
-  const block = blocks[entryPointId];
-  if (block.type === 'sequential') {
-    sequences.push(block.id);
-  }
-  if (Array.isArray(block.children)) {
-    for (let i = 0; i < block.children.length; i++) {
-      const childId = block.children[i];
-      createSequenceIdList(blocks, childId, sequences);
-    }
-  }
-  return sequences;
-}
-
-export function createUnitIdList(blocks, entryPointId, units = []) {
-  const block = blocks[entryPointId];
-  if (block.type === 'vertical') {
-    units.push(block.id);
-  }
-  if (Array.isArray(block.children)) {
-    for (let i = 0; i < block.children.length; i++) {
-      const childId = block.children[i];
-      createUnitIdList(blocks, childId, units);
-    }
-  }
-  return units;
-}
-
-export function findBlockAncestry(blocks, blockId, descendents = []) {
-  const block = blocks[blockId];
-  descendents.unshift(block);
-  if (block.parentId === undefined) {
-    return descendents;
-  }
-  return findBlockAncestry(blocks, block.parentId, descendents);
-}

src/data/api.js

@@ -0,0 +1,176 @@
+/* eslint-disable import/prefer-default-export */
+import { getConfig, camelCaseObject } from '@edx/frontend-platform';
+import { getAuthenticatedHttpClient, getAuthenticatedUser } from '@edx/frontend-platform/auth';
+import { logError } from '@edx/frontend-platform/logging';
+
+function overrideTabUrls(id, tabs) {
+  // "LMS tab slug" to "MFE URL slug" for overridden tabs
+  const tabOverrides = {};
+  return tabs.map((tab) => {
+    let url;
+    if (tabOverrides[tab.slug]) {
+      url = `/course/${id}/${tabOverrides[tab.slug]}`;
+    } else {
+      url = `${getConfig().LMS_BASE_URL}${tab.url}`;
+    }
+    return { ...tab, url };
+  });
+}
+
+function normalizeMetadata(metadata) {
+  return {
+    canShowUpgradeSock: metadata.can_show_upgrade_sock,
+    contentTypeGatingEnabled: metadata.content_type_gating_enabled,
+    // TODO: TNL-7185: return course expired _date_, instead of _message_
+    courseExpiredMessage: metadata.course_expired_message,
+    id: metadata.id,
+    title: metadata.name,
+    number: metadata.number,
+    offerHtml: metadata.offer_html,
+    org: metadata.org,
+    enrollmentStart: metadata.enrollment_start,
+    enrollmentEnd: metadata.enrollment_end,
+    end: metadata.end,
+    start: metadata.start,
+    enrollmentMode: metadata.enrollment.mode,
+    isEnrolled: metadata.enrollment.is_active,
+    canLoadCourseware: camelCaseObject(metadata.can_load_courseware),
+    isStaff: metadata.is_staff,
+    verifiedMode: camelCaseObject(metadata.verified_mode),
+    tabs: overrideTabUrls(metadata.id, camelCaseObject(metadata.tabs)),
+    showCalculator: metadata.show_calculator,
+    notes: camelCaseObject(metadata.notes),
+  };
+}
+
+export async function getCourseMetadata(courseId) {
+  const url = `${getConfig().LMS_BASE_URL}/api/courseware/course/${courseId}`;
+  const { data } = await getAuthenticatedHttpClient().get(url);
+  return normalizeMetadata(data);
+}
+
+function normalizeBlocks(courseId, blocks) {
+  const models = {
+    courses: {},
+    sections: {},
+    sequences: {},
+    units: {},
+  };
+  Object.values(blocks).forEach(block => {
+    switch (block.type) {
+      case 'course':
+        models.courses[block.id] = {
+          id: courseId,
+          title: block.display_name,
+          sectionIds: block.children || [],
+        };
+        break;
+      case 'chapter':
+        models.sections[block.id] = {
+          id: block.id,
+          title: block.display_name,
+          sequenceIds: block.children || [],
+        };
+        break;
+
+      case 'sequential':
+        models.sequences[block.id] = {
+          id: block.id,
+          title: block.display_name,
+          lmsWebUrl: block.lms_web_url,
+          unitIds: block.children || [],
+        };
+        break;
+      case 'vertical':
+        models.units[block.id] = {
+          graded: block.graded,
+          id: block.id,
+          title: block.display_name,
+          lmsWebUrl: block.lms_web_url,
+        };
+        break;
+      default:
+        logError(`Unexpected course block type: ${block.type} with ID ${block.id}.  Expected block types are course, chapter, sequential, and vertical.`);
+    }
+  });
+
+  // Next go through each list and use their child lists to decorate those children with a
+  // reference back to their parent.
+  Object.values(models.courses).forEach(course => {
+    if (Array.isArray(course.sectionIds)) {
+      course.sectionIds.forEach(sectionId => {
+        const section = models.sections[sectionId];
+        section.courseId = course.id;
+      });
+    }
+  });
+
+  Object.values(models.sections).forEach(section => {
+    if (Array.isArray(section.sequenceIds)) {
+      section.sequenceIds.forEach(sequenceId => {
+        models.sequences[sequenceId].sectionId = section.id;
+      });
+    }
+  });
+
+  Object.values(models.sequences).forEach(sequence => {
+    if (Array.isArray(sequence.unitIds)) {
+      sequence.unitIds.forEach(unitId => {
+        models.units[unitId].sequenceId = sequence.id;
+      });
+    }
+  });
+
+  return models;
+}
+
+export async function getCourseBlocks(courseId) {
+  const { username } = getAuthenticatedUser();
+  const url = new URL(`${getConfig().LMS_BASE_URL}/api/courses/v2/blocks/`);
+  url.searchParams.append('course_id', courseId);
+  url.searchParams.append('username', username);
+  url.searchParams.append('depth', 3);
+  url.searchParams.append('requested_fields', 'children,show_gated_sections,graded');
+
+  const { data } = await getAuthenticatedHttpClient().get(url.href, {});
+  return normalizeBlocks(courseId, data.blocks);
+}
+
+
+function normalizeSequenceMetadata(sequence) {
+  return {
+    sequence: {
+      id: sequence.item_id,
+      unitIds: sequence.items.map(unit => unit.id),
+      bannerText: sequence.banner_text,
+      title: sequence.display_name,
+      gatedContent: camelCaseObject(sequence.gated_content),
+      isTimeLimited: sequence.is_time_limited,
+      // Position comes back from the server 1-indexed. Adjust here.
+      activeUnitIndex: sequence.position ? sequence.position - 1 : 0,
+      saveUnitPosition: sequence.save_position,
+      showCompletion: sequence.show_completion,
+    },
+    units: sequence.items.map(unit => ({
+      id: unit.id,
+      sequenceId: sequence.item_id,
+      bookmarked: unit.bookmarked,
+      complete: unit.complete,
+      title: unit.page_title,
+      contentType: unit.type,
+    })),
+  };
+}
+
+export async function getSequenceMetadata(sequenceId) {
+  const { data } = await getAuthenticatedHttpClient()
+    .get(`${getConfig().LMS_BASE_URL}/api/courseware/sequence/${sequenceId}`, {});
+
+  return normalizeSequenceMetadata(data);
+}
+
+export async function getResumeBlock(courseId) {
+  const url = new URL(`${getConfig().LMS_BASE_URL}/api/courseware/resume/${courseId}`);
+  const { data } = await getAuthenticatedHttpClient().get(url.href, {});
+  return camelCaseObject(data);
+}

src/data/course-blocks/api.js

@@ -1,109 +0,0 @@
-import { getConfig, camelCaseObject } from '@edx/frontend-platform';
-import { getAuthenticatedHttpClient, getAuthenticatedUser } from '@edx/frontend-platform/auth';
-
-export async function getCourseBlocks(courseUsageKey) {
-  const { username } = getAuthenticatedUser();
-  const url = new URL(`${getConfig().LMS_BASE_URL}/api/courses/v2/blocks/`);
-  url.searchParams.append('course_id', courseUsageKey);
-  url.searchParams.append('username', username);
-  url.searchParams.append('depth', 3);
-  url.searchParams.append('requested_fields', 'children,show_gated_sections');
-
-  const { data } = await getAuthenticatedHttpClient().get(url.href, {});
-  // Camelcase block objects (leave blockId keys alone)
-  const blocks = Object.entries(data.blocks).reduce((acc, [key, value]) => {
-    acc[key] = camelCaseObject(value);
-    return acc;
-  }, {});
-
-  // Next go through the blocksList again - now that we've added them all to the blocks map - and
-  // append a parent ID to every child found in every `children` list, using the blocks map to find
-  // them.
-  Object.values(blocks).forEach((block) => {
-    if (Array.isArray(block.children)) {
-      const parentId = block.id;
-      block.children.forEach((childBlockId) => {
-        blocks[childBlockId].parentId = parentId;
-      });
-    }
-  });
-
-  const processedData = camelCaseObject(data);
-  processedData.blocks = blocks;
-
-  return processedData;
-}
-
-export async function getSequenceMetadata(sequenceId) {
-  const { data } = await getAuthenticatedHttpClient()
-    .get(`${getConfig().LMS_BASE_URL}/api/courseware/sequence/${sequenceId}`, {});
-  const camelCasedData = camelCaseObject(data);
-
-  camelCasedData.items = camelCasedData.items.map((item) => {
-    const processedItem = camelCaseObject(item);
-    processedItem.contentType = processedItem.type;
-    delete processedItem.type;
-    return processedItem;
-  });
-
-  // Position comes back from the server 1-indexed. Adjust here.
-  camelCasedData.position = camelCasedData.position ? camelCasedData.position - 1 : 0;
-
-  return camelCasedData;
-}
-
-const getSequenceXModuleHandlerUrl = (courseUsageKey, sequenceId) => `${getConfig().LMS_BASE_URL}/courses/${courseUsageKey}/xblock/${sequenceId}/handler/xmodule_handler`;
-
-export async function updateSequencePosition(courseUsageKey, sequenceId, position) {
-  // Post data sent to this endpoint must be url encoded
-  // TODO: Remove the need for this to be the case.
-  // TODO: Ensure this usage of URLSearchParams is working in Internet Explorer
-  const urlEncoded = new URLSearchParams();
-  // Position is 1-indexed on the server and 0-indexed in this app. Adjust here.
-  urlEncoded.append('position', position + 1);
-  const requestConfig = {
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-  };
-
-  const { data } = await getAuthenticatedHttpClient().post(
-    `${getSequenceXModuleHandlerUrl(courseUsageKey, sequenceId)}/goto_position`,
-    urlEncoded.toString(),
-    requestConfig,
-  );
-
-  return data;
-}
-
-export async function getBlockCompletion(courseUsageKey, sequenceId, usageKey) {
-  // Post data sent to this endpoint must be url encoded
-  // TODO: Remove the need for this to be the case.
-  // TODO: Ensure this usage of URLSearchParams is working in Internet Explorer
-  const urlEncoded = new URLSearchParams();
-  urlEncoded.append('usage_key', usageKey);
-  const requestConfig = {
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-  };
-
-  const { data } = await getAuthenticatedHttpClient().post(
-    `${getSequenceXModuleHandlerUrl(courseUsageKey, sequenceId)}/get_completion`,
-    urlEncoded.toString(),
-    requestConfig,
-  );
-
-  if (data.complete) {
-    return true;
-  }
-
-  return false;
-}
-
-const bookmarksBaseUrl = `${getConfig().LMS_BASE_URL}/api/bookmarks/v1/bookmarks/`;
-
-export async function createBookmark(usageId) {
-  return getAuthenticatedHttpClient().post(bookmarksBaseUrl, { usage_id: usageId });
-}
-
-export async function deleteBookmark(usageId) {
-  const { username } = getAuthenticatedUser();
-  return getAuthenticatedHttpClient().delete(`${bookmarksBaseUrl}${username},${usageId}/`);
-}

src/data/course-blocks/index.js

@@ -1,20 +0,0 @@
-export {
-  getCourseBlocks,
-  getSequenceMetadata,
-  updateSequencePosition,
-  getBlockCompletion,
-  createBookmark,
-  deleteBookmark,
-} from './api';
-export {
-  reducer,
-  courseBlocksShape,
-} from './slice';
-export {
-  fetchCourseBlocks,
-  fetchSequenceMetadata,
-  checkBlockCompletion,
-  saveSequencePosition,
-  addBookmark,
-  removeBookmark,
-} from './thunks';

src/data/course-blocks/slice.js

@@ -1,142 +0,0 @@
-/* eslint-disable no-param-reassign */
-import { createSlice } from '@reduxjs/toolkit';
-import PropTypes from 'prop-types';
-
-const blocksSlice = createSlice({
-  name: 'blocks',
-  initialState: {
-    fetchState: null,
-    root: null,
-    blocks: {},
-  },
-  reducers: {
-    /**
-     * fetchCourseBlocks
-     * This routine is responsible for fetching all blocks in a course.
-     */
-    fetchCourseBlocksRequest: (draftState) => {
-      draftState.fetchState = 'loading';
-    },
-    fetchCourseBlocksSuccess: (draftState, { payload }) => ({
-      ...payload,
-      fetchState: 'loaded',
-      loaded: true,
-    }),
-    fetchCourseBlocksFailure: (draftState) => {
-      draftState.fetchState = 'failed';
-    },
-
-    /**
-     * fetchBlockMetadata
-     * This routine is responsible for fetching metadata for any kind of
-     * block (sequential, vertical or any other block) and merging that
-     * data with what is in the store. Currently used for:
-     *
-     *  - fetchSequenceMetadata
-     *  - checkBlockCompletion (Vertical blocks)
-     */
-    fetchBlockMetadataRequest: (draftState, action) => {
-      const { blockId } = action.payload;
-      if (!draftState.blocks[blockId]) {
-        draftState.blocks[blockId] = {};
-      }
-      draftState.blocks[blockId].fetchState = 'loading';
-    },
-    fetchBlockMetadataSuccess: (draftState, action) => {
-      const { blockId, metadata, relatedBlocksMetadata } = action.payload;
-      if (!draftState.blocks[blockId]) {
-        draftState.blocks[blockId] = {};
-      }
-      draftState.blocks[blockId] = {
-        ...draftState.blocks[blockId],
-        ...metadata,
-        fetchState: 'loaded',
-        loaded: true,
-      };
-      if (relatedBlocksMetadata) {
-        relatedBlocksMetadata.forEach((blockMetadata) => {
-          if (draftState.blocks[blockMetadata.id] === undefined) {
-            draftState.blocks[blockMetadata.id] = {};
-          }
-          draftState.blocks[blockMetadata.id] = {
-            ...draftState.blocks[blockMetadata.id],
-            ...blockMetadata,
-          };
-        });
-      }
-    },
-    fetchBlockMetadataFailure: (draftState, action) => {
-      const { blockId } = action.payload;
-      if (!draftState.blocks[blockId]) {
-        draftState.blocks[blockId] = {};
-      }
-      draftState.blocks[blockId].fetchState = 'failure';
-    },
-
-    /**
-     * updateBlock
-     * This routine is responsible for CRUD operations on block properties.
-     * Updates to blocks are handled in an optimistic way – applying the update
-     * to the store at request time and then reverting it if the update fails.
-     *
-     * TODO: It may be helpful to add a flag to be optimistic or not.
-     *
-     * The update state of a property is added to the block in the store with
-     * a dynamic property name: ${propertyToUpdate}UpdateState.
-     * (e.g. bookmarkedUpdateState)
-     *
-     * Used in:
-     *  - saveSequencePosition
-     *  - addBookmark
-     *  - removeBookmark
-     */
-    updateBlockRequest: (draftState, action) => {
-      const { blockId, propertyToUpdate, updateValue } = action.payload;
-      const updateStateKey = `${propertyToUpdate}UpdateState`;
-      if (!draftState.blocks[blockId]) {
-        draftState.blocks[blockId] = {};
-      }
-      draftState.blocks[blockId][updateStateKey] = 'loading';
-      draftState.blocks[blockId][propertyToUpdate] = updateValue;
-    },
-    updateBlockSuccess: (draftState, action) => {
-      const { blockId, propertyToUpdate, updateValue } = action.payload;
-      const updateStateKey = `${propertyToUpdate}UpdateState`;
-      if (!draftState.blocks[blockId]) {
-        draftState.blocks[blockId] = {};
-      }
-      draftState.blocks[blockId][updateStateKey] = 'updated';
-      draftState.blocks[blockId][propertyToUpdate] = updateValue;
-    },
-    updateBlockFailure: (draftState, action) => {
-      const { blockId, propertyToUpdate, initialValue } = action.payload;
-      const updateStateKey = `${propertyToUpdate}UpdateState`;
-      if (!draftState.blocks[blockId]) {
-        draftState.blocks[blockId] = {};
-      }
-      draftState.blocks[blockId][updateStateKey] = 'failed';
-      draftState.blocks[blockId][propertyToUpdate] = initialValue;
-    },
-  },
-});
-
-export const {
-  fetchCourseBlocksRequest,
-  fetchCourseBlocksSuccess,
-  fetchCourseBlocksFailure,
-  fetchBlockMetadataRequest,
-  fetchBlockMetadataSuccess,
-  fetchBlockMetadataFailure,
-  updateBlockRequest,
-  updateBlockSuccess,
-  updateBlockFailure,
-} = blocksSlice.actions;
-
-export const { reducer } = blocksSlice;
-
-export const courseBlocksShape = PropTypes.objectOf(PropTypes.shape({
-  id: PropTypes.string.isRequired,
-  displayName: PropTypes.string.isRequired,
-  children: PropTypes.arrayOf(PropTypes.string),
-  parentId: PropTypes.string,
-}));

src/data/course-blocks/thunks.js

@@ -1,124 +0,0 @@
-import {
-  fetchCourseBlocksRequest,
-  fetchCourseBlocksSuccess,
-  fetchCourseBlocksFailure,
-  fetchBlockMetadataRequest,
-  fetchBlockMetadataSuccess,
-  fetchBlockMetadataFailure,
-  updateBlockRequest,
-  updateBlockSuccess,
-  updateBlockFailure,
-} from './slice';
-import {
-  getCourseBlocks,
-  getSequenceMetadata,
-  getBlockCompletion,
-  updateSequencePosition,
-  createBookmark,
-  deleteBookmark,
-} from './api';
-
-export function fetchCourseBlocks(courseUsageKey) {
-  return async (dispatch) => {
-    dispatch(fetchCourseBlocksRequest(courseUsageKey));
-    try {
-      const courseBlocks = await getCourseBlocks(courseUsageKey);
-      dispatch(fetchCourseBlocksSuccess(courseBlocks));
-    } catch (error) {
-      dispatch(fetchCourseBlocksFailure(error));
-    }
-  };
-}
-
-export function fetchSequenceMetadata(sequenceBlockId) {
-  return async (dispatch) => {
-    dispatch(fetchBlockMetadataRequest({ blockId: sequenceBlockId }));
-    try {
-      const sequenceMetadata = await getSequenceMetadata(sequenceBlockId);
-      dispatch(fetchBlockMetadataSuccess({
-        blockId: sequenceBlockId,
-        metadata: sequenceMetadata,
-        relatedBlocksMetadata: sequenceMetadata.items,
-      }));
-    } catch (error) {
-      dispatch(fetchBlockMetadataFailure({ blockId: sequenceBlockId }, error));
-    }
-  };
-}
-
-export function checkBlockCompletion(courseUsageKey, sequenceId, unitId) {
-  return async (dispatch, getState) => {
-    const { courseBlocks } = getState();
-    if (courseBlocks.blocks[unitId].complete) {
-      return; // do nothing. Things don't get uncompleted after they are completed.
-    }
-    const commonPayload = { blockId: unitId, fetchType: 'completion' };
-    dispatch(fetchBlockMetadataRequest(commonPayload));
-    try {
-      const isComplete = await getBlockCompletion(courseUsageKey, sequenceId, unitId);
-      dispatch(fetchBlockMetadataSuccess({
-        ...commonPayload,
-        metadata: {
-          complete: isComplete,
-        },
-      }));
-    } catch (error) {
-      dispatch(fetchBlockMetadataFailure(commonPayload, error));
-    }
-  };
-}
-
-export function saveSequencePosition(courseUsageKey, sequenceId, position) {
-  return async (dispatch, getState) => {
-    const { courseBlocks } = getState();
-    const actionPayload = {
-      blockId: sequenceId,
-      propertyToUpdate: 'position',
-      updateValue: position,
-      initialValue: courseBlocks.blocks[sequenceId].position,
-    };
-    dispatch(updateBlockRequest(actionPayload));
-    try {
-      await updateSequencePosition(courseUsageKey, sequenceId, position);
-      dispatch(updateBlockSuccess(actionPayload));
-    } catch (error) {
-      dispatch(updateBlockFailure(actionPayload));
-    }
-  };
-}
-
-export function addBookmark(unitId) {
-  return async (dispatch) => {
-    const actionPayload = {
-      blockId: unitId,
-      propertyToUpdate: 'bookmarked',
-      updateValue: true,
-      initialValue: false,
-    };
-    dispatch(updateBlockRequest(actionPayload));
-    try {
-      await createBookmark(unitId);
-      dispatch(updateBlockSuccess(actionPayload));
-    } catch (error) {
-      dispatch(updateBlockFailure(actionPayload));
-    }
-  };
-}
-
-export function removeBookmark(unitId) {
-  return async (dispatch) => {
-    const actionPayload = {
-      blockId: unitId,
-      propertyToUpdate: 'bookmarked',
-      updateValue: false,
-      initialValue: true,
-    };
-    dispatch(updateBlockRequest(actionPayload));
-    try {
-      await deleteBookmark(unitId);
-      dispatch(updateBlockSuccess(actionPayload));
-    } catch (error) {
-      dispatch(updateBlockFailure(actionPayload));
-    }
-  };
-}

src/data/course-meta/api.js

@@ -1,10 +0,0 @@
-/* eslint-disable import/prefer-default-export */
-import { getConfig, camelCaseObject } from '@edx/frontend-platform';
-import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
-
-export async function getCourseMetadata(courseUsageKey) {
-  const url = `${getConfig().LMS_BASE_URL}/api/courseware/course/${courseUsageKey}`;
-  const { data } = await getAuthenticatedHttpClient().get(url);
-  const processedData = camelCaseObject(data);
-  return processedData;
-}

src/data/course-meta/index.js

@@ -1,6 +0,0 @@
-export { getCourseMetadata } from './api';
-export {
-  reducer,
-  courseMetadataShape,
-} from './slice';
-export { fetchCourseMetadata } from './thunks';

src/data/course-meta/slice.js

@@ -1,93 +0,0 @@
-/* eslint-disable no-param-reassign */
-import { createSlice } from '@reduxjs/toolkit';
-import PropTypes from 'prop-types';
-
-const courseMetaSlice = createSlice({
-  name: 'course-meta',
-  initialState: {
-    fetchState: null,
-  },
-  reducers: {
-    fetchCourseMetadataRequest: (draftState) => {
-      draftState.fetchState = 'loading';
-    },
-    fetchCourseMetadataSuccess: (draftState, { payload }) => ({
-      fetchState: 'loaded',
-
-      /*
-       * NOTE: If you change the data saved here,
-       * update the courseMetadataShape below!
-       */
-
-      // Course identifiers
-      name: payload.name,
-      number: payload.number,
-      org: payload.org,
-
-      // Enrollment dates
-      enrollmentStart: payload.enrollmentStart,
-      enrollmentEnd: payload.enrollmentEnd,
-
-      // Course dates
-      end: payload.end,
-      start: payload.start,
-
-      // User access/enrollment status
-      enrollmentMode: payload.enrollment.mode,
-      isEnrolled: payload.enrollment.isActive,
-      userHasAccess: payload.userHasAccess,
-      verifiedMode: payload.verifiedMode,
-
-      // Misc
-      tabs: payload.tabs,
-    }),
-    fetchCourseMetadataFailure: (draftState) => {
-      draftState.fetchState = 'failed';
-    },
-  },
-});
-
-export const {
-  fetchCourseMetadataRequest,
-  fetchCourseMetadataSuccess,
-  fetchCourseMetadataFailure,
-} = courseMetaSlice.actions;
-
-export const { reducer } = courseMetaSlice;
-
-export const courseMetadataShape = PropTypes.shape({
-  fetchState: PropTypes.string,
-  // Course identifiers
-  name: PropTypes.string,
-  number: PropTypes.string,
-  org: PropTypes.string,
-
-  // Enrollment dates
-  enrollmentStart: PropTypes.string,
-  enrollmentEnd: PropTypes.string,
-
-  // User access/enrollment status
-  enrollmentMode: PropTypes.string,
-  isEnrolled: PropTypes.bool,
-  userHasAccess: PropTypes.bool,
-  verifiedMode: PropTypes.shape({
-    price: PropTypes.number.isRequired,
-    currency: PropTypes.string.isRequired,
-    currencySymbol: PropTypes.string.isRequired,
-    sku: PropTypes.string.isRequired,
-    upgradeUrl: PropTypes.string.isRequired,
-  }),
-
-  // Course dates
-  start: PropTypes.string,
-  end: PropTypes.string,
-
-  // Misc
-  tabs: PropTypes.arrayOf(PropTypes.shape({
-    priority: PropTypes.number,
-    slug: PropTypes.string,
-    title: PropTypes.string,
-    type: PropTypes.string,
-    url: PropTypes.string,
-  })),
-});

src/data/course-meta/thunks.js

@@ -1,21 +0,0 @@
-/* eslint-disable import/prefer-default-export */
-import {
-  fetchCourseMetadataRequest,
-  fetchCourseMetadataSuccess,
-  fetchCourseMetadataFailure,
-} from './slice';
-import {
-  getCourseMetadata,
-} from './api';
-
-export function fetchCourseMetadata(courseUsageKey) {
-  return async (dispatch) => {
-    dispatch(fetchCourseMetadataRequest({ courseUsageKey }));
-    try {
-      const courseMetadata = await getCourseMetadata(courseUsageKey);
-      dispatch(fetchCourseMetadataSuccess(courseMetadata));
-    } catch (error) {
-      dispatch(fetchCourseMetadataFailure(error));
-    }
-  };
-}

src/data/index.js

@@ -0,0 +1,7 @@
+export {
+  fetchCourse,
+  fetchSequence,
+} from './thunks';
+
+export { getResumeBlock } from './api';
+export { reducer } from './slice';

src/data/slice.js

@@ -0,0 +1,61 @@
+/* eslint-disable no-param-reassign */
+import { createSlice } from '@reduxjs/toolkit';
+
+export const LOADING = 'loading';
+export const LOADED = 'loaded';
+export const FAILED = 'failed';
+export const DENIED = 'denied';
+
+const slice = createSlice({
+  name: 'courseware',
+  initialState: {
+    courseStatus: 'loading',
+    courseId: null,
+    sequenceStatus: 'loading',
+    sequenceId: null,
+  },
+  reducers: {
+    fetchCourseRequest: (state, { payload }) => {
+      state.courseId = payload.courseId;
+      state.courseStatus = LOADING;
+    },
+    fetchCourseSuccess: (state, { payload }) => {
+      state.courseId = payload.courseId;
+      state.courseStatus = LOADED;
+    },
+    fetchCourseFailure: (state, { payload }) => {
+      state.courseId = payload.courseId;
+      state.courseStatus = FAILED;
+    },
+    fetchCourseDenied: (state, { payload }) => {
+      state.courseId = payload.courseId;
+      state.courseStatus = DENIED;
+    },
+    fetchSequenceRequest: (state, { payload }) => {
+      state.sequenceId = payload.sequenceId;
+      state.sequenceStatus = LOADING;
+    },
+    fetchSequenceSuccess: (state, { payload }) => {
+      state.sequenceId = payload.sequenceId;
+      state.sequenceStatus = LOADED;
+    },
+    fetchSequenceFailure: (state, { payload }) => {
+      state.sequenceId = payload.sequenceId;
+      state.sequenceStatus = FAILED;
+    },
+  },
+});
+
+export const {
+  fetchCourseRequest,
+  fetchCourseSuccess,
+  fetchCourseFailure,
+  fetchCourseDenied,
+  fetchSequenceRequest,
+  fetchSequenceSuccess,
+  fetchSequenceFailure,
+} = slice.actions;
+
+export const {
+  reducer,
+} = slice;

src/data/thunks.js

@@ -0,0 +1,107 @@
+import { logError } from '@edx/frontend-platform/logging';
+import {
+  getCourseMetadata,
+  getCourseBlocks,
+  getSequenceMetadata,
+} from './api';
+import {
+  addModelsMap, updateModel, updateModels, updateModelsMap, addModel,
+} from '../model-store';
+import {
+  fetchCourseRequest,
+  fetchCourseSuccess,
+  fetchCourseFailure,
+  fetchCourseDenied,
+  fetchSequenceRequest,
+  fetchSequenceSuccess,
+  fetchSequenceFailure,
+} from './slice';
+
+export function fetchCourse(courseId) {
+  return async (dispatch) => {
+    dispatch(fetchCourseRequest({ courseId }));
+    Promise.allSettled([
+      getCourseMetadata(courseId),
+      getCourseBlocks(courseId),
+    ]).then(([courseMetadataResult, courseBlocksResult]) => {
+      if (courseMetadataResult.status === 'fulfilled') {
+        dispatch(addModel({
+          modelType: 'courses',
+          model: courseMetadataResult.value,
+        }));
+      }
+
+      if (courseBlocksResult.status === 'fulfilled') {
+        const {
+          courses, sections, sequences, units,
+        } = courseBlocksResult.value;
+
+        dispatch(updateModelsMap({
+          modelType: 'courses',
+          modelsMap: courses,
+        }));
+        dispatch(addModelsMap({
+          modelType: 'sections',
+          modelsMap: sections,
+        }));
+        // We update for sequences and units because the sequence metadata may have come back first.
+        dispatch(updateModelsMap({
+          modelType: 'sequences',
+          modelsMap: sequences,
+        }));
+        dispatch(updateModelsMap({
+          modelType: 'units',
+          modelsMap: units,
+        }));
+      }
+
+      const fetchedMetadata = courseMetadataResult.status === 'fulfilled';
+      const fetchedBlocks = courseBlocksResult.status === 'fulfilled';
+
+      // Log errors for each request if needed. Course block failures may occur
+      // even if the course metadata request is successful
+      if (!fetchedBlocks) {
+        logError(courseBlocksResult.reason);
+      }
+      if (!fetchedMetadata) {
+        logError(courseMetadataResult.reason);
+      }
+
+      if (fetchedMetadata) {
+        if (courseMetadataResult.value.canLoadCourseware.hasAccess && fetchedBlocks) {
+          // User has access
+          dispatch(fetchCourseSuccess({ courseId }));
+          return;
+        }
+        // User either doesn't have access or only has partial access
+        // (can't access course blocks)
+        dispatch(fetchCourseDenied({ courseId }));
+        return;
+      }
+
+      // Definitely an error happening
+      dispatch(fetchCourseFailure({ courseId }));
+    });
+  };
+}
+
+export function fetchSequence(sequenceId) {
+  return async (dispatch) => {
+    dispatch(fetchSequenceRequest({ sequenceId }));
+    try {
+      const { sequence, units } = await getSequenceMetadata(sequenceId);
+      dispatch(updateModel({
+        modelType: 'sequences',
+        model: sequence,
+      }));
+      dispatch(updateModels({
+        modelType: 'units',
+        models: units,
+      }));
+      dispatch(fetchSequenceSuccess({ sequenceId }));
+    } catch (error) {
+      logError(error);
+      dispatch(fetchSequenceFailure({ sequenceId }));
+    }
+  };
+}

src/enrollment-alert/EnrollmentAlert.jsx

@@ -1,24 +1,37 @@
 import React from 'react';
-import { getConfig } from '@edx/frontend-platform';
 import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+import PropTypes from 'prop-types';
+import { Button } from '@edx/paragon';
+
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faSpinner } from '@fortawesome/free-solid-svg-icons';
+import { Alert } from '../user-messages';
 
-import Alert from '../user-messages/Alert';
 import messages from './messages';
+import { useEnrollClickHandler } from './hooks';
+
+function EnrollmentAlert({ intl, courseId }) {
+  const { enrollClickHandler, loading } = useEnrollClickHandler(
+    courseId,
+    intl.formatMessage(messages['learning.enrollment.success']),
+  );
 
-function EnrollmentAlert({ intl }) {
   return (
     <Alert type="error">
       {intl.formatMessage(messages['learning.enrollment.alert'])}
       {' '}
-      <a href={`${getConfig().LMS_BASE_URL}/api/enrollment/v1/enrollment`}>
+      <Button disabled={loading} className="btn-link p-0 border-0 align-top" onClick={enrollClickHandler}>
         {intl.formatMessage(messages['learning.enrollment.enroll.now'])}
-      </a>
+      </Button>
+      {' '}
+      {loading && <FontAwesomeIcon icon={faSpinner} spin />}
     </Alert>
   );
 }
 
 EnrollmentAlert.propTypes = {
   intl: intlShape.isRequired,
+  courseId: PropTypes.string.isRequired,
 };
 
 export default injectIntl(EnrollmentAlert);

src/enrollment-alert/StaffEnrollmentAlert.jsx

@@ -0,0 +1,37 @@
+import React from 'react';
+import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
+import PropTypes from 'prop-types';
+import { Button } from '@edx/paragon';
+
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { faSpinner } from '@fortawesome/free-solid-svg-icons';
+import { Alert } from '../user-messages';
+
+import messages from './messages';
+import { useEnrollClickHandler } from './hooks';
+
+function StaffEnrollmentAlert({ intl, courseId }) {
+  const { enrollClickHandler, loading } = useEnrollClickHandler(
+    courseId,
+    intl.formatMessage(messages['learning.enrollment.success']),
+  );
+
+  return (
+    <Alert type="info" dismissible>
+      {intl.formatMessage(messages['learning.staff.enrollment.alert'])}
+      {' '}
+      <Button disabled={loading} className="btn-link p-0 border-0 align-top" onClick={enrollClickHandler}>
+        {intl.formatMessage(messages['learning.enrollment.enroll.now'])}
+      </Button>
+      {' '}
+      {loading && <FontAwesomeIcon icon={faSpinner} spin />}
+    </Alert>
+  );
+}
+
+StaffEnrollmentAlert.propTypes = {
+  intl: intlShape.isRequired,
+  courseId: PropTypes.string.isRequired,
+};
+
+export default injectIntl(StaffEnrollmentAlert);