Add Learning Tools Interoperability (LTI) blade.

LTI blade allows to include LTI components to courses.
Python integration, Jasmine and acceptance tests are included.

lms/djangoapps/courseware/tests/test_lti.py

+"""LTI integration tests"""
+
+import requests
+from . import BaseTestXmodule
+from collections import OrderedDict
+import mock
+
+
+class TestLTI(BaseTestXmodule):
+    """
+    Integration test for lti xmodule.
+
+    It checks overall code, by assuring that context that goes to template is correct.
+    As part of that, checks oauth signature generation by mocking signing function of `requests` library.
+    """
+    CATEGORY = "lti"
+
+    def setUp(self):
+        """
+        Mock oauth1 signing of requests library for testing.
+        """
+        super(TestLTI, self).setUp()
+        mocked_nonce = u'135685044251684026041377608307'
+        mocked_timestamp = u'1234567890'
+        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_nonce,
+            u'oauth_timestamp': mocked_timestamp,
+            u'oauth_consumer_key': u'',
+            u'oauth_signature_method': u'HMAC-SHA1',
+            u'oauth_version': u'1.0',
+            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> here:
+            __, headers, __ = saved_sign(self, *args, **kwargs)
+            # we should replace nonce, timestamp and signed_signature in headers:
+            old = headers[u'Authorization']
+            old_parsed = OrderedDict([param.strip().replace('"', '').split('=') for param in old.split(',')])
+            old_parsed[u'OAuth oauth_nonce'] = mocked_nonce
+            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
+
+        patcher = mock.patch.object(requests.auth.Client, "sign", mocked_sign)
+        patcher.start()
+        self.addCleanup(patcher.stop)
+
+    def test_lti_constructor(self):
+        """
+        Makes sure that all parameters extracted.
+        """
+        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(),
+            'launch_url': '',  # default value
+        }
+        self.assertDictEqual(generated_context, expected_context)

lms/templates/lti.html

+<div id="${element_id}" class="${element_class}">
+
+    ## This form will be hidden. Once available on the client, the LTI
+    ## module JavaScript will trigget a "submit" on the form, and the
+    ## result will be rendered to the below iFrame.
+    <form
+        action="${launch_url}"
+        name="ltiLaunchForm"
+        class="ltiLaunchForm"
+        method="post"
+        target="ltiLaunchFrame"
+        encType="application/x-www-form-urlencoded"
+    >
+
+        % for param_name, param_value in input_fields.items():
+            <input name="${param_name}" value="${param_value}" />
+        %endfor
+
+        <input type="submit" value="Press to Launch" />
+    </form>
+
+    <h3 class="error_message">
+        Please provide launch_url. Click "Edit", and fill in the
+        required fields.
+    </h3>
+
+    ## The result of the form submit will be rendered here.
+    <iframe
+        name="ltiLaunchFrame"
+        class="ltiLaunchFrame"
+        src=""
+    ></iframe>
+
+</div>