keep empty params parsed from the URL (fixes #22)

Author: zookos

oauth2/__init__.py

@@ -582,7 +582,7 @@ def _split_header(header):
     @staticmethod
     def _split_url_string(param_str):
         """Turn URL string into parameters."""
-        parameters = parse_qs(param_str.encode('utf-8'), keep_blank_values=False)
+        parameters = parse_qs(param_str.encode('utf-8'), keep_blank_values=True)
         for k, v in parameters.iteritems():
             parameters[k] = urllib.unquote(v[0])
         return parameters

tests/test_oauth.py

@@ -531,6 +531,17 @@ def test_signature_base_string_with_query(self):
         self.assertEquals(normalized_params['alt'], 'json')
         self.assertEquals(normalized_params['max-contacts'], '10')
 
+    def test_get_normalized_parameters_empty(self):
+        url = "http://sp.example.com/?empty="
+
+        req = oauth.Request("GET", url)
+
+        res = req.get_normalized_parameters()
+
+        expected='empty='
+
+        self.assertEquals(expected, res)
+
     def test_get_normalized_parameters(self):
         url = "http://sp.example.com/"