[Web] Accept charset in content-type for json messages

Trac: https://dev.deluge-torrent.org/ticket/3521
Closes: https://github.com/deluge-torrent/deluge/pull/385

deluge/tests/test_json_api.py

@@ -98,6 +98,24 @@ class TestJSON:
         with pytest.raises(JSONException):
             json._on_json_request(request)
 
+    def test_on_json_request_valid_content_type(self):
+        """Ensure content-type application/json is accepted"""
+        json = JSON()
+        request = MagicMock()
+        request.getHeader.return_value = b'application/json'
+        json_data = {'method': 'some.method', 'id': 0, 'params': []}
+        request.json = json_lib.dumps(json_data).encode()
+        json._on_json_request(request)
+
+    def test_on_json_request_valid_content_type_with_charset(self):
+        """Ensure content-type parameters such as charset are ignored"""
+        json = JSON()
+        request = MagicMock()
+        request.getHeader.return_value = b'application/json;charset=utf-8'
+        json_data = {'method': 'some.method', 'id': 0, 'params': []}
+        request.json = json_lib.dumps(json_data).encode()
+        json._on_json_request(request)
+
 
 @pytest.mark.usefixtures('daemon', 'client', 'component')
 class TestJSONCustomUserTestCase:

deluge/ui/web/json_api.py

@@ -6,6 +6,7 @@
 # See LICENSE for more details.
 #
 
+import cgi
 import json
 import logging
 import os
@@ -190,7 +191,7 @@ class JSON(resource.Resource, component.Component):
         Handler to take the json data as a string and pass it on to the
         _handle_request method for further processing.
         """
-        content_type = request.getHeader(b'content-type').decode()
+        content_type, _ = cgi.parse_header(request.getHeader(b'content-type').decode())
         if content_type != 'application/json':
             message = 'Invalid JSON request content-type: %s' % content_type
             raise JSONException(message)