Adding resource_link_id template tag for adding the resource link id to form...

Adding resource_link_id template tag for adding the resource link id to form submission GET requests

django_auth_lti/templatetags/django_auth_lti.py

+import logging
+import json
+
+from django import template
+from django.utils.html import format_html
+
+from django_auth_lti.thread_local import get_current_request
+
+
+logger = logging.getLogger(__name__)
+register = template.Library()
+
+
+class ResourceLinkIdNode(template.Node):
+    def render(self, context):
+        request = get_current_request()
+        if request:
+            rli = request.LTI.get('resource_link_id')
+            if rli:
+                return format_html("<input type='hidden' name='resource_link_id' value='{}' />", rli)
+            else:
+                logger.warning(
+                    "Failed to find resource_link_id in request context {}",
+                    json.dumps(request.LTI, indent=4)
+                )
+        else:
+            logger.warning("Failed to get current request from thread_local")
+        return ''
+
+
+@register.tag
+def resource_link_id(parser, token):
+    return ResourceLinkIdNode()