====================================
lti: Learning Tools Interoperability
====================================
This library is a fork of lti_lti_py_
It has been modified to accept non-standard params and bubble up useful
error messages in the form of exceptions to the caller.
``lti`` is a Python library implementing the
Learning Tools Interoperability (LTI) standard.
It is based on lti_lti_py_,
which is based on dce_lti_py_,
which is based on ims_lti_py_.
.. _lti_lti_py: https://github.com/pylti/lti
.. _dce_lti_py: https://github.com/harvard-dce/dce_lti_py
.. _ims_lti_py: https://github.com/tophatmonocle/ims_lti_py
Installation
============
.. code-block:: sh
pip install lti
Dependencies
============
* lxml_
* oauthlib_
* requests-oauthlib_
.. _lxml: https://github.com/lxml/lxml
.. _oauthlib: https://github.com/idan/oauthlib
.. _requests-oauthlib: https://github.com/requests/requests-oauthlib
Usage
=====
The primary goal of this library is to provide classes
for building Python LTI tool providers (LTI apps).
To that end, the functionality that you're looking for
is probably in the ``ToolConfig`` and ``ToolProvider`` classes (``ToolConsumer``
is available too, if you want to consume LTI Providers).
Tool Config Example (Django)
----------------------------
Here's an example of a Django view you might use as the
configuration URL when registering your app with the LTI consumer.
.. code-block:: python
from lti import ToolConfig
from django.http import HttpResponse
def tool_config(request):
# basic stuff
app_title = 'My App'
app_description = 'An example LTI App'
launch_view_name = 'lti_launch'
launch_url = request.build_absolute_uri(reverse('lti_launch'))
# maybe you've got some extensions
extensions = {
'my_extensions_provider': {
# extension settings...
}
}
lti_tool_config = ToolConfig(
title=app_title,
launch_url=launch_url,
secure_launch_url=launch_url,
extensions=extensions,
description = app_description
)
return HttpResponse(lti_tool_config.to_xml(), content_type='text/xml')
Tool Provider OAuth Request Validation Example (Django)
-------------------------------------------------------
.. code-block:: python
from lti.contrib.django import DjangoToolProvider
from my_app import RequestValidator
from oauthlib.oauth1 import SignatureOnlyEndpoint
# create the tool provider instance
tool_provider = DjangoToolProvider.from_django_request(request=request)
# the tool provider uses the 'oauthlib' library which requires an instance
# of a validator class when doing the oauth request signature checking.
# see https://oauthlib.readthedocs.org/en/latest/oauth1/validator.html for
# info on how to create one
validator = RequestValidator()
# validate the oauth request signature
ok = tool_provider.is_valid_request(SignatureOnlyEndpoint, validator)
# do stuff if ok / not ok
Tool Consumer Example (Django)
------------------------------
In your view:
.. code-block:: python
def index(request):
consumer = ToolConsumer(
consumer_key='my_key_given_from_provider',
consumer_secret='super_secret',
launch_url='provider_url',
params={
'lti_message_type': 'basic-lti-launch-request'
}
)
return render(
request,
'lti_consumer/index.html',
{
'launch_data': consumer.generate_launch_data(),
'launch_url': consumer.launch_url
}
)
At the template:
.. code-block:: html
<form action="{{ launch_url }}"
name="ltiLaunchForm"
id="ltiLaunchForm"
method="POST"
encType="application/x-www-form-urlencoded">
{% for key, value in launch_data.items %}
<input type="hidden" name="{{ key }}" value="{{ value }}"/>
{% endfor %}
<button type="submit">Launch the tool</button>
</form>
Testing
=======
Unit tests can be run by executing
.. code-block:: sh
tox
This uses tox_ to set up and run the test environment.
.. _tox: https://tox.readthedocs.org/