feat: Add slots to add tab links for courses

Adds new slot that allow adding new links to course tabs.

src/course-tabs/CourseTabLink.tsx

@@ -0,0 +1,20 @@
+import classNames from 'classnames';
+import React from 'react';
+
+interface CourseTabLinkProps {
+  slug: string;
+  activeTabSlug?: string;
+  url: string;
+  title: string;
+}
+
+export const CourseTabLink = ({
+  slug, activeTabSlug, url, title,
+}: CourseTabLinkProps) => (
+  <a
+    href={url}
+    className={classNames('nav-item flex-shrink-0 nav-link', { active: slug === activeTabSlug })}
+  >
+    {title}
+  </a>
+);

src/course-tabs/CourseTabLinksList.tsx

@@ -0,0 +1,25 @@
+import { CourseTabLink } from '@src/course-tabs/CourseTabLink';
+import React from 'react';
+
+interface CourseTabLinkListProps {
+  tabs: Array<{
+    title: string;
+    slug: string;
+    url: string;
+  }>,
+  activeTabSlug?: string;
+}
+
+export const CourseTabLinksList = ({ tabs, activeTabSlug }: CourseTabLinkListProps) => (
+  <>
+    {tabs.map(({ url, title, slug }) => (
+      <CourseTabLink
+        key={slug}
+        url={url}
+        slug={slug}
+        title={title}
+        activeTabSlug={activeTabSlug}
+      />
+    ))}
+  </>
+);

src/course-tabs/CourseTabsNavigation.tsx

@@ -1,16 +1,28 @@
 import React from 'react';
-import PropTypes from 'prop-types';
-import { useIntl } from '@edx/frontend-platform/i18n';
 import classNames from 'classnames';
-
-import messages from './messages';
-import Tabs from '../generic/tabs/Tabs';
+import { useIntl } from '@edx/frontend-platform/i18n';
+import { CourseTabLinksSlot } from '../plugin-slots/CourseTabLinksSlot';
 import { CoursewareSearch, CoursewareSearchToggle } from '../course-home/courseware-search';
 import { useCoursewareSearchState } from '../course-home/courseware-search/hooks';
 
+import Tabs from '../generic/tabs/Tabs';
+import messages from './messages';
+
+interface CourseTabsNavigationProps {
+  activeTabSlug?: string;
+  className?: string | null;
+  tabs: Array<{
+    title: string;
+    slug: string;
+    url: string;
+  }>;
+}
+
 const CourseTabsNavigation = ({
-  activeTabSlug, className, tabs,
-}) => {
+  activeTabSlug = undefined,
+  className = null,
+  tabs,
+}:CourseTabsNavigationProps) => {
   const intl = useIntl();
   const { show } = useCoursewareSearchState();
 
@@ -23,15 +35,7 @@ const CourseTabsNavigation = ({
               className="nav-underline-tabs"
               aria-label={intl.formatMessage(messages.courseMaterial)}
             >
-              {tabs.map(({ url, title, slug }) => (
-                <a
-                  key={slug}
-                  className={classNames('nav-item flex-shrink-0 nav-link', { active: slug === activeTabSlug })}
-                  href={url}
-                >
-                  {title}
-                </a>
-              ))}
+              <CourseTabLinksSlot tabs={tabs} activeTabSlug={activeTabSlug} />
             </Tabs>
           </div>
           <div className="search-toggle">
@@ -44,19 +48,4 @@ const CourseTabsNavigation = ({
   );
 };
 
-CourseTabsNavigation.propTypes = {
-  activeTabSlug: PropTypes.string,
-  className: PropTypes.string,
-  tabs: PropTypes.arrayOf(PropTypes.shape({
-    title: PropTypes.string.isRequired,
-    slug: PropTypes.string.isRequired,
-    url: PropTypes.string.isRequired,
-  })).isRequired,
-};
-
-CourseTabsNavigation.defaultProps = {
-  activeTabSlug: undefined,
-  className: null,
-};
-
 export default CourseTabsNavigation;

src/plugin-slots/CourseTabLinksSlot/README.md

@@ -0,0 +1,51 @@
+# Course Tab Links Slot
+
+### Slot ID: `org.openedx.frontend.learning.course_tab_links.v1`
+
+### Props:
+* `activeTabSlug`: The slug of the currently active tab.
+
+## Description
+
+This slot is used to replace/modify/hide the course tabs.
+
+## Example
+
+### Added link to Course Tabs
+![Added "Custom Tab" to course tabs](./course-tabs-custom.png)
+
+The following `env.config.jsx` will add a new course tab call "Custom Tab".
+
+```js
+import { DIRECT_PLUGIN, PLUGIN_OPERATIONS } from '@openedx/frontend-plugin-framework';
+
+import { CourseTabLink } from '@src/course-tabs/CourseTabLink';
+
+
+const config = {
+  pluginSlots: {
+    "org.openedx.frontend.learning.course_tab_links.v1": {
+      keepDefault: true,
+      plugins: [
+        {
+          op: PLUGIN_OPERATIONS.Insert,
+          widget: {
+            id: 'custom_tab',
+            type: DIRECT_PLUGIN,
+            RenderWidget: ({ activeTabSlug })=> (
+              <CourseTabLink
+                url="/some/path"
+                slug="custom-link"
+                title="Custom Tab"
+                activeTabSlug={activeTabSlug}
+              />
+            ),
+          },
+        },
+      ],
+    },
+  },
+}
+
+export default config;
+```

src/plugin-slots/CourseTabLinksSlot/index.tsx

@@ -0,0 +1,21 @@
+import { PluginSlot } from '@openedx/frontend-plugin-framework';
+import { CourseTabLinksList } from '@src/course-tabs/CourseTabLinksList';
+import React from 'react';
+
+type CourseTabList = Array<{
+  title: string;
+  slug: string;
+  url: string;
+}>;
+
+export const CourseTabLinksSlot = ({ tabs, activeTabSlug }: {
+  tabs: CourseTabList,
+  activeTabSlug?: string
+}) => (
+  <PluginSlot
+    id="org.openedx.frontend.learning.course_tab_links.v1"
+    pluginProps={{ activeTabSlug }}
+  >
+    <CourseTabLinksList tabs={tabs} activeTabSlug={activeTabSlug} />
+  </PluginSlot>
+);