Lift and shift Video Block code moving from edx-platform

xblocks_contrib/video/ajax_handler_mixin.py

@@ -0,0 +1,45 @@
+# NOTE: Code has been copied from the following source file
+# https://github.com/openedx/edx-platform/blob/master/xmodule/x_module.py#L739
+
+class XModuleToXBlockMixin:
+    """
+    Common code needed by XModule and XBlocks converted from XModules.
+    """
+    @property
+    def ajax_url(self):
+        """
+        Returns the URL for the ajax handler.
+        """
+        return self.runtime.handler_url(self, 'xmodule_handler', '', '').rstrip('/?')
+
+    @XBlock.handler
+    def xmodule_handler(self, request, suffix=None):
+        """
+        XBlock handler that wraps `handle_ajax`
+        """
+        class FileObjForWebobFiles:
+            """
+            Turn Webob cgi.FieldStorage uploaded files into pure file objects.
+
+            Webob represents uploaded files as cgi.FieldStorage objects, which
+            have a .file attribute.  We wrap the FieldStorage object, delegating
+            attribute access to the .file attribute.  But the files have no
+            name, so we carry the FieldStorage .filename attribute as the .name.
+
+            """
+            def __init__(self, webob_file):
+                self.file = webob_file.file
+                self.name = webob_file.filename
+
+            def __getattr__(self, name):
+                return getattr(self.file, name)
+
+        # WebOb requests have multiple entries for uploaded files.  handle_ajax
+        # expects a single entry as a list.
+        request_post = MultiDict(request.POST)
+        for key in set(request.POST.keys()):
+            if hasattr(request.POST[key], "file"):
+                request_post[key] = list(map(FileObjForWebobFiles, request.POST.getall(key)))
+
+        response_data = self.handle_ajax(suffix, request_post)
+        return Response(response_data, content_type='application/json', charset='UTF-8')