Pyramid OAuthLib

Pyramid OAuthLib is a library to integrate the excellent OAuthLib library easily into Pyramid applications. It is designed to ease development of OAuth applications, provide smooth migration possibilites to legacy codebases using other authentication or authorization schemes, and configuration patterns for creating pluggable OAuth components for Pyramid.

NOTICE: Pyramid OAuthLib is not feature complete! It is missing the hooks for token revocation. While this shouldn't be hard to add, it wasn't a priority to get the initial version released.

Usage Overview

Configuration:

def includeme(config):
    """Integration with OAuthLib is as smooth as possible."""
    from oauthlib.oauth2 import BearerToken, AuthorizationCodeGrant

    # Validator callback functions are passed Pyramid request objects so
    # you can access your request properties, database sessions, etc.
    # The request object is populated with accessors for the properties
    # referred to in the OAuthLib docs and used by its built in types.
    validator = MyRequestValidator()

    # Register response types to create grants.
    config.add_response_type('oauthlib.oauth2.AuthorizationCodeGrant',
                             name='code',
                             request_validator=validator)

    # Register grant types to validate token requests.
    config.add_grant_type('oauthlib.oauth2.AuthorizationCodeGrant',
                          name='authorization_code',
                          request_validator=validator)

    # Register the token types to use at token endpoints.
    # The second parameter to all registrations may be left out to set it
    # as default to use when no corresponding request parameter specifies
    # the grant, response or token type. Be aware that the built in types
    # will fail if a matching request parameter is missing, though.
    config.add_token_type('oauthlib.oauth2.BearerToken',
                          request_validator=validator)

Token response:

def access_token(request):
    """Core functionality is available directly from the request.

    Responses from OAuthLib are wrapped in a response object of type
    :class:`pyramid.response.Response` so they can be returned directly
    from views.
    """
    userid = request.authenticated_userid
    if userid is not None:
        credentials = dict(userId=userid)
    else:
        credentials = None

    return request.create_token_response(credentials=credentials)

Custom grant type:

from oauthlib.oauth2 import ClientCredentialsGrant, InvalidClientError
from pyramid.authentication import BadCSRFToken
from pyramid.session import check_csrf_token

class SessionGrant(ClientCredentialsGrant):

    """A combined authentication and authorization session assertion grant.

    When the Authorization Server and the Token Service are the same server
    this grant type uses a single assertion, the CSRF token, for client
    authentication and an authorization grant.[1] This works particularly
    well with :class:`pyramid.authentication.SessionAuthenticationPolicy`.

    [1] http://tools.ietf.org/html/draft-ietf-oauth-assertions-01#section-3
    """

    def validate_token_request(self, request):
        try:
            check_csrf_token(request, token='assertion')
        except BadCSRFToken:
            raise InvalidClientError(request=request)

        # An object with the confidential client_id and client_secret.
        request.client = LOCAL_CLIENT

        if request.client is None:
            raise InvalidClientError(request=request)

        request.client_id = request.client_id or request.client.client_id


def includeme(config):
    config.add_grant_type(SessionGrant, 'assertion')

License

Pyramid OAuthLib is released under the 2-Clause BSD License, sometimes referred to as the "Simplified BSD License" or the "FreeBSD License". More license information can be found in the included LICENSE.txt file.