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Improve LTI module

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Add simplifyed template.
Update lti integration test.
Add getting oauth credentials from course settings.
Add user id transferring to provider.
Improve documentation of lti module.
This commit is contained in:
Alexander Kryklia
2013-09-05 16:43:14 +03:00
parent fd64ed9a49
commit f6d9c077f0
3 changed files with 66 additions and 66 deletions
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70
common/lib/xmodule/xmodule/lti_module.py
View File

@@ -14,6 +14,7 @@ import urllib
from xmodule.editing_module import MetadataOnlyEditingDescriptor
from xmodule.x_module import XModule
from xmodule.course_module import CourseDescriptor
from pkg_resources import resource_string
from xblock.core import String, Scope, List
@@ -106,9 +107,9 @@ class LTIModule(LTIFields, XModule):
<input name="role" value="student" />
<input name="oauth_signature" value="${oauth_signature}" />
% for param_name, param_value in custom_parameters.items():
<input name="${param_name}" value="${param_value}" />
%endfor
<input name="custom_1" value="${custom_param_1_value}" />
<input name="custom_2" value="${custom_param_2_value}" />
<input name="custom_..." value="${custom_param_..._value}" />
<input type="submit" value="Press to Launch" />
</form>
@@ -129,13 +130,9 @@ class LTIModule(LTIFields, XModule):
""" Renders parameters to template. """
# Obtains client_key and client_secret credentials from current course:
# course location example: u'i4x://blades/1/course/2013_Spring'
course = self.descriptor.system.load_item(
self.location.tag + '://' +
self.location.org + '/' +
self.location.course +
'/course' +
'/2013_Spring')
course_id = self.runtime.course_id
course_location = CourseDescriptor.id_to_location(course_id)
course = self.descriptor.runtime.modulestore.get_item(course_location)
client_key, client_secret = '', ''
for lti_passport in course.LTIs:
try:
@@ -147,15 +144,8 @@ class LTIModule(LTIFields, XModule):
client_key, client_secret = key, secret
break
# these params do not participate in oauth signing
params = {
'launch_url': self.launch_url,
'element_id': self.location.html_id(),
'element_class': self.location.category,
}
# parsing custom parameters to dict
parsed_custom_parameters = {}
custom_parameters = {}
for custom_parameter in self.custom_parameters:
try:
param_name, param_value = custom_parameter.split('=')
@@ -164,17 +154,26 @@ class LTIModule(LTIFields, XModule):
Should be "x=y" string.'.format(custom_parameter))
# LTI specs: 'custom_' should be prepended before each custom parameter
parsed_custom_parameters.update(
custom_parameters.update(
{u'custom_' + unicode(param_name): unicode(param_value)}
)
params.update({'custom_parameters': parsed_custom_parameters})
params.update(self.oauth_params(
parsed_custom_parameters,
input_fields = (self.oauth_params(
custom_parameters,
client_key,
client_secret
))
return self.system.render_template('lti.html', params)
context = {
'input_fields': input_fields,
# these params do not participate in oauth signing
'launch_url': self.launch_url,
'element_id': self.location.html_id(),
'element_class': self.location.category,
}
return self.system.render_template('lti.html', context)
def oauth_params(self, custom_parameters, client_key, client_secret):
"""Signs request and returns signature and oauth parameters.
@@ -191,20 +190,19 @@ class LTIModule(LTIFields, XModule):
client_secret=unicode(client_secret)
)
# @ned - why self.runtime.anonymous_student_id is None in dev env?
user_id = self.runtime.anonymous_student_id
user_id = user_id if user_id else 'default_user_id'
assert user_id is not None
# must have parameters for correct signing from LTI:
body = {
'user_id': user_id,
'oauth_callback': 'about:blank',
'lis_outcome_service_url': '',
'lis_result_sourcedid': '',
'launch_presentation_return_url': '',
'lti_message_type': 'basic-lti-launch-request',
'lti_version': 'LTI-1p0',
'role': 'student'
u'user_id': user_id,
u'oauth_callback': u'about:blank',
u'lis_outcome_service_url': '',
u'lis_result_sourcedid': '',
u'launch_presentation_return_url': '',
u'lti_message_type': u'basic-lti-launch-request',
u'lti_version': 'LTI-1p0',
u'role': u'student'
}
# appending custom parameter for signing
@@ -220,13 +218,11 @@ class LTIModule(LTIFields, XModule):
headers=headers)
params = headers['Authorization']
# parse headers to pass to template as part of context:
params = dict([param.strip().replace('"', '').split('=') for param in params.split('",')])
params = dict([param.strip().replace('"', '').split('=') for param in params.split(',')])
params[u'oauth_nonce'] = params[u'OAuth oauth_nonce']
del params[u'OAuth oauth_nonce']
params['user_id'] = body['user_id']
# 0.14.2 (current) version of requests oauth library encodes signature,
# with 'Content-Type': 'application/x-www-form-urlencoded'
# so '='' becomes '%3D'.
@@ -234,6 +230,8 @@ class LTIModule(LTIFields, XModule):
# So we need to decode signature back:
params[u'oauth_signature'] = urllib.unquote(params[u'oauth_signature']).decode('utf8')
# add lti parameters to oauth parameters for sending in form
params.update(body)
return params

46
lms/djangoapps/courseware/tests/test_lti.py
View File

@@ -1,53 +1,69 @@
"""LTI test"""
"""LTI integration tests"""
import requests
from . import BaseTestXmodule
from collections import OrderedDict
class TestLTI(BaseTestXmodule):
"""Integration test for word cloud xmodule."""
"""
Integration test for lti xmodule.
"""
CATEGORY = "lti"
def setUp(self):
"""
Mock oauth1 signing of requests library for testing.
"""
super(TestLTI, self).setUp()
mocked_noonce = u'135685044251684026041377608307'
mocked_timestamp = u'1234567890'
mocked_signed_signature = u'my_signature%3D'
mocked_signature_after_sign = u'my_signature%3D'
mocked_decoded_signature = u'my_signature='
self.correct_headers = {
u'oauth_callback': u'about:blank',
u'lis_outcome_service_url': '',
u'lis_result_sourcedid': '',
u'launch_presentation_return_url': '',
u'lti_message_type': u'basic-lti-launch-request',
u'lti_version': 'LTI-1p0',
u'oauth_nonce': mocked_noonce,
u'oauth_timestamp': mocked_timestamp,
u'oauth_consumer_key': u'',
u'oauth_signature_method': u'HMAC-SHA1',
u'oauth_version': u'1.0',
u'oauth_signature': mocked_decoded_signature}
u'user_id': self.runtime.anonymous_student_id,
u'role': u'student',
u'oauth_signature': mocked_decoded_signature
}
saved_sign = requests.auth.Client.sign
def mocked_sign(self, *args, **kwargs):
"""Mocked oauth1 sign function"""
# self is <oauthlib.oauth1.rfc5849.Client object at 0x107456e90> here:
# self is <oauthlib.oauth1.rfc5849.Client object> here:
_, headers, _ = saved_sign(self, *args, **kwargs)
# we should replace noonce, timestamp and signed_signature in headers:
old = headers[u'Authorization']
new = old[:19] + mocked_noonce + old[49:69] + mocked_timestamp + \
old[79:179] + mocked_signed_signature + old[-1]
headers[u'Authorization'] = new
old_parsed = OrderedDict([param.strip().replace('"', '').split('=') for param in old.split(',')])
old_parsed[u'OAuth oauth_nonce'] = mocked_noonce
old_parsed[u'oauth_timestamp'] = mocked_timestamp
old_parsed[u'oauth_signature'] = mocked_signature_after_sign
headers[u'Authorization'] = ', '.join([k+'="'+v+'"' for k, v in old_parsed.items()])
return None, headers, None
requests.auth.Client.sign = mocked_sign
def test_lti_constructor(self):
"""Make sure that all parameters extracted """
fragment = self.runtime.render(self.item_module, None, 'student_view')
self.runtime.render_template = lambda template, context: context
generated_context = self.item_module.get_html()
expected_context = {
'input_fields': self.correct_headers,
'element_class': self.item_module.location.category,
'element_id': self.item_module.location.html_id(),
'lti_url': '', # default value
'launch_url': '', # default value
}
self.correct_headers.update(expected_context)
self.assertEqual(
fragment.content,
self.runtime.render_template('lti.html', self.correct_headers)
)
self.assertDictEqual(generated_context, expected_context)

16
lms/templates/lti.html
View File

@@ -11,22 +11,8 @@
target="ltiLaunchFrame"
encType="application/x-www-form-urlencoded"
>
<input name="launch_presentation_return_url" value="" />
<input name="lis_outcome_service_url" value="" />
<input name="lis_result_sourcedid" value="" />
<input name="lti_message_type" value="basic-lti-launch-request" />
<input name="lti_version" value="LTI-1p0" />
<input name="oauth_callback" value="about:blank" />
<input name="oauth_consumer_key" value="${oauth_consumer_key}" />
<input name="oauth_nonce" value="${oauth_nonce}" />
<input name="oauth_signature_method" value="HMAC-SHA1" />
<input name="oauth_timestamp" value="${oauth_timestamp}" />
<input name="oauth_version" value="1.0" />
<input name="user_id" value="${user_id}" />
<input name="role" value="student" />
<input name="oauth_signature" value="${oauth_signature}" />
% for param_name, param_value in custom_parameters.items():
% for param_name, param_value in input_fields.items():
<input name="${param_name}" value="${param_value}" />
%endfor