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# -*- coding: utf-8 -*-
"""
oauthlib.openid.connect.core.grant_types
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"""
import logging
from .base import GrantTypeBase
from oauthlib.oauth2.rfc6749.grant_types.implicit import ImplicitGrant as OAuth2ImplicitGrant
from oauthlib.oauth2.rfc6749.errors import InvalidRequestError
log = logging.getLogger(__name__)
class ImplicitGrant(GrantTypeBase):
def __init__(self, request_validator=None, **kwargs):
self.proxy_target = OAuth2ImplicitGrant(
request_validator=request_validator, **kwargs)
self.register_response_type('id_token')
self.register_response_type('id_token token')
self.custom_validators.post_auth.append(
self.openid_authorization_validator)
self.register_token_modifier(self.add_id_token)
def add_id_token(self, token, token_handler, request):
if 'state' not in token and request.state:
token['state'] = request.state
return super().add_id_token(token, token_handler, request, nonce=request.nonce)
def openid_authorization_validator(self, request):
"""Additional validation when following the implicit flow.
"""
request_info = super().openid_authorization_validator(request)
if not request_info: # returns immediately if OAuth2.0
return request_info
# REQUIRED. String value used to associate a Client session with an ID
# Token, and to mitigate replay attacks. The value is passed through
# unmodified from the Authentication Request to the ID Token.
# Sufficient entropy MUST be present in the nonce values used to
# prevent attackers from guessing values. For implementation notes, see
# Section 15.5.2.
if not request.nonce:
raise InvalidRequestError(
request=request,
description='Request is missing mandatory nonce parameter.'
)
return request_info
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