- Make the OAuth config system centralized

- Add support for Github Enterprise login

util/oauth.py

@@ -0,0 +1,81 @@
+import urlparse
+
+class OAuthConfig(object):
+  def __init__(self, app, key_name):
+    self.key_name = key_name
+    self.config = app.config.get(key_name, {})
+
+  def service_name(self):
+    raise NotImplementedError
+
+  def token_endpoint(self):
+    raise NotImplementedError
+
+  def user_endpoint(self):
+    raise NotImplementedError
+
+  def login_endpoint(self):
+    raise NotImplementedError
+
+  def client_id(self):
+    return self.config.get('CLIENT_ID')
+
+  def client_secret(self):
+    return self.config.get('CLIENT_SECRET')
+
+  def _get_url(self, endpoint, *args):
+    if not endpoint:
+      raise Exception('Missing endpoint configuration for OAuth config %s', self.key_name)
+
+    for arg in args:
+      endpoint = urlparse.urljoin(endpoint, arg)
+
+    return endpoint
+
+
+class GithubOAuthConfig(OAuthConfig):
+  def __init__(self, app, key_name):
+    super(GithubOAuthConfig, self).__init__(app, key_name)
+
+  def service_name(self):
+    return 'GitHub'
+
+  def authorize_endpoint(self):
+    endpoint = self.config.get('GITHUB_ENDPOINT')
+    return self._get_url(endpoint, '/login/oauth/authorize')  + '?'
+
+  def token_endpoint(self):
+    endpoint = self.config.get('GITHUB_ENDPOINT')
+    return self._get_url(endpoint, '/login/oauth/access_token')
+
+  def _api_endpoint(self):
+    endpoint = self.config.get('GITHUB_ENDPOINT')
+    return self.config.get('API_ENDPOINT', self._get_url(endpoint, '/api/v3/'))
+
+  def user_endpoint(self):
+    api_endpoint = self._api_endpoint()
+    return self._get_url(api_endpoint, 'user')
+
+  def email_endpoint(self):
+    api_endpoint = self._api_endpoint()
+    return self._get_url(api_endpoint, 'user/emails')
+
+
+class GoogleOAuthConfig(OAuthConfig):
+  def __init__(self, app, key_name):
+    super(GoogleOAuthConfig, self).__init__(app, key_name)
+
+  def service_name(self):
+    return 'Google'
+
+  def authorize_endpoint(self):
+    return 'https://accounts.google.com/o/oauth2/auth?response_type=code&'
+
+  def token_endpoint(self):
+    return 'https://accounts.google.com/o/oauth2/token'
+
+  def user_endpoint(self):
+    return 'https://www.googleapis.com/oauth2/v1/userinfo'
+
+
+