Yahoo OAuth 1.0 backend

diff --git a/social_auth/backends/contrib/yahoo.py b/social_auth/backends/contrib/yahoo.py
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+++ b/social_auth/backends/contrib/yahoo.py
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+"""
+OAuth 1.0 Yahoo backend
+
+Options:
+YAHOO_CONSUMER_KEY
+YAHOO_CONSUMER_SECRET
+
+References:
+* http://developer.yahoo.com/oauth/guide/oauth-auth-flow.html
+* http://developer.yahoo.com/social/rest_api_guide/introspective-guid-resource.html
+* http://developer.yahoo.com/social/rest_api_guide/extended-profile-resource.html
+"""
+
+from django.utils import simplejson
+
+from social_auth.utils import setting
+from social_auth.backends import ConsumerBasedOAuth, OAuthBackend, USERNAME
+
+
+# Google OAuth base configuration
+YAHOO_OAUTH_SERVER = 'api.login.yahoo.com'
+REQUEST_TOKEN_URL  = 'https://api.login.yahoo.com/oauth/v2/get_request_token'
+AUTHORIZATION_URL  = 'https://api.login.yahoo.com/oauth/v2/request_auth'
+ACCESS_TOKEN_URL   = 'https://api.login.yahoo.com/oauth/v2/get_token'
+
+
+class YahooOAuthBackend(OAuthBackend):
+    """Yahoo OAuth authentication backend"""
+    name = 'yahoo-oauth'
+
+    EXTRA_DATA = [
+        ('guid', 'id'),
+        ('access_token', 'access_token'),
+        ('expires', setting('SOCIAL_AUTH_EXPIRATION', 'expires'))
+    ]
+
+    def get_user_id(self, details, response):
+        return response['guid']
+
+    def get_user_details(self, response):
+        """Return user details from Orkut account"""
+        fname = response.get('givenName')
+        lname = response.get('familyName')
+        return {USERNAME:     response.get('nickname'),
+                'email':      response.get('emails')[0]['handle'],
+                'fullname':   '%s %s' % (fname, lname),
+                'first_name': fname,
+                'last_name':  lname}
+
+
+class YahooOAuth(ConsumerBasedOAuth):
+    AUTHORIZATION_URL    = AUTHORIZATION_URL
+    REQUEST_TOKEN_URL    = REQUEST_TOKEN_URL
+    ACCESS_TOKEN_URL     = ACCESS_TOKEN_URL
+    SERVER_URL           = YAHOO_OAUTH_SERVER
+    AUTH_BACKEND         = YahooOAuthBackend
+    SETTINGS_KEY_NAME    = 'YAHOO_CONSUMER_KEY'
+    SETTINGS_SECRET_NAME = 'YAHOO_CONSUMER_SECRET'
+
+    def user_data(self, access_token, *args, **kwargs):
+        """Loads user data from service"""
+        guid = self._get_guid(access_token)
+        url = 'http://social.yahooapis.com/v1/user/%s/profile?format=json' % guid
+        request = self.oauth_request(access_token, url)
+        response = self.fetch_response(request)
+        try:
+            return simplejson.loads(response)['profile']
+        except ValueError:
+            return None
+
+    def _get_guid(self, access_token):
+        url = 'http://social.yahooapis.com/v1/me/guid?format=json'
+        request = self.oauth_request(access_token, url)
+        response = self.fetch_response(request)
+        try:
+            json = simplejson.loads(response)
+            return json['guid']['value']
+        except ValueError:
+            return 'me'
+
+# Backend definition
+BACKENDS = {
+    'yahoo-oauth': YahooOAuth
+}