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views.py
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views.py
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from django.conf import settings
from django.contrib import messages
from django.contrib.auth import authenticate, login
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import Group
from django.http.response import HttpResponseRedirect
from django.shortcuts import get_object_or_404, render
from django.urls import reverse
from django.utils.decorators import method_decorator
from django.views.decorators.clickjacking import xframe_options_exempt
from django.views.decorators.csrf import csrf_exempt
from django.views.generic.base import View, TemplateView
from lti_auth.lti import LTI
from lti_auth.models import LTICourseContext
class LTIAuthMixin(object):
role_type = 'any'
request_type = 'any'
def join_groups(self, lti, ctx, user):
# add the user to the requested groups
user.groups.add(ctx.group)
for role in lti.user_roles():
role = role.lower()
if ('staff' in role or
'instructor' in role or
'administrator' in role):
user.groups.add(ctx.faculty_group)
break
domains = getattr(settings, 'LTI_ELEVATE_TEACHINGASSISTANTS', [])
if 'teachingassistant' in role and lti.canvas_domain() in domains:
user.groups.add(ctx.faculty_group)
break
def dispatch(self, request, *args, **kwargs):
lti = LTI(self.request_type, self.role_type)
# validate the user via oauth
user = authenticate(request=request, lti=lti)
if user is None:
lti.clear_session(request)
return render(request, 'lti_auth/fail_auth.html', {})
# login
login(request, user)
# check if course is configured
try:
ctx = LTICourseContext.objects.get(
lms_course_context=lti.course_context())
except (KeyError, ValueError, LTICourseContext.DoesNotExist):
return render(
request,
'lti_auth/fail_course_configuration.html',
{
'is_instructor': lti.is_instructor(),
'is_administrator': lti.is_administrator(),
'user': user,
'lms_course': lti.course_context(),
'lms_course_title': lti.course_title(),
'sis_course_id': lti.sis_course_id(),
'domain': lti.canvas_domain()
})
# add user to the course
self.join_groups(lti, ctx, user)
self.lti = lti
return super(LTIAuthMixin, self).dispatch(request, *args, **kwargs)
@method_decorator(csrf_exempt, name='dispatch')
@method_decorator(xframe_options_exempt, name='dispatch')
class LTIRoutingView(LTIAuthMixin, View):
request_type = 'initial'
role_type = 'any'
def add_extra_parameters(self, url):
if not hasattr(settings, 'LTI_EXTRA_PARAMETERS'):
return
if '?' not in url:
url += '?'
else:
url += '&'
for key in settings.LTI_EXTRA_PARAMETERS:
url += '{}={}&'.format(key, self.request.POST.get(key, ''))
return url
def post(self, request):
if request.POST.get('ext_content_intended_use', '') == 'embed':
domain = self.request.get_host()
url = '%s://%s/%s?return_url=%s' % (
self.request.scheme, domain,
settings.LTI_TOOL_CONFIGURATION['embed_url'],
request.POST.get('launch_presentation_return_url'))
else:
url = reverse('lti-landing-page', args=[self.lti.course_context()])
url = self.add_extra_parameters(url)
return HttpResponseRedirect(url)
class LTIConfigView(TemplateView):
template_name = 'lti_auth/config.xml'
content_type = 'text/xml; charset=utf-8'
def get_context_data(self, **kwargs):
domain = self.request.get_host()
launch_url = '%s://%s/%s' % (
self.request.scheme, domain,
settings.LTI_TOOL_CONFIGURATION['launch_url'])
ctx = {
'domain': domain,
'launch_url': launch_url,
'title': settings.LTI_TOOL_CONFIGURATION['title'],
'description': settings.LTI_TOOL_CONFIGURATION['description'],
'embed_icon_url':
settings.LTI_TOOL_CONFIGURATION['embed_icon_url'],
'embed_tool_id': settings.LTI_TOOL_CONFIGURATION['embed_tool_id'],
}
return ctx
@method_decorator(xframe_options_exempt, name='dispatch')
class LTILandingPage(TemplateView):
template_name = 'lti_auth/landing_page.html'
def get_context_data(self, **kwargs):
domain = self.request.get_host()
url = settings.LTI_TOOL_CONFIGURATION['landing_url'].format(
self.request.scheme, domain, kwargs.get('context'))
return {
'landing_url': url,
'title': settings.LTI_TOOL_CONFIGURATION['title']
}
@method_decorator(csrf_exempt, name='dispatch')
@method_decorator(xframe_options_exempt, name='dispatch')
class LTICourseEnableView(View):
@method_decorator(login_required)
def dispatch(self, request, *args, **kwargs):
return super(self.__class__, self).dispatch(request, *args, **kwargs)
def post(self, *args, **kwargs):
group_id = self.request.POST.get('group')
faculty_group_id = self.request.POST.get('faculty_group')
course_context = self.request.POST.get('lms_course')
title = self.request.POST.get('lms_course_title')
(ctx, created) = LTICourseContext.objects.get_or_create(
group=get_object_or_404(Group, id=group_id),
faculty_group=get_object_or_404(Group, id=faculty_group_id),
lms_course_context=course_context)
messages.add_message(
self.request, messages.INFO,
'<b>Success!</b> {} is connected to Mediathread.'.format(title))
url = reverse('lti-landing-page', args=[course_context])
return HttpResponseRedirect(url)