use doseq in urllib.urlencode to correctly encode sequence values.

this is absolutely required for Client since querystring value that gets
passed in via URI will pass through parse_qs and result in {"k": ["v1"]} for
a single value.

Author: brosner

oauth2/__init__.py

@@ -309,7 +309,10 @@ def to_header(self, realm=''):
 
     def to_postdata(self):
         """Serialize as post data for a POST request."""
-        return urllib.urlencode(self)
+        # tell urlencode to deal with sequence values and map them correctly
+        # to resulting querystring. for example self["k"] = ["v1", "v2"] will
+        # result in 'k=v1&k=v2' and not k=%5B%27v1%27%2C+%27v2%27%5D
+        return urllib.urlencode(self, True)
 
     def to_url(self):
         """Serialize as a URL for a GET request."""
@@ -325,7 +328,7 @@ def get_parameter(self, parameter):
     def get_normalized_parameters(self):
         """Return a string that contains the parameters that must be signed."""
         items = [(k, v) for k, v in self.items() if k != 'oauth_signature']
-        encoded_str = urllib.urlencode(sorted(items))
+        encoded_str = urllib.urlencode(sorted(items), True)
         # Encode signature parameters per Oauth Core 1.0 protocol
         # spec draft 7, section 3.6
         # (http://tools.ietf.org/html/draft-hammer-oauth-07#section-3.6)