django-oidc-provider/oidc_provider/lib/endpoints/authorize.py

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from datetime import timedelta
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import logging
try:
from urllib import urlencode
from urlparse import urlsplit, parse_qs, urlunsplit
except ImportError:
from urllib.parse import urlsplit, parse_qs, urlunsplit, urlencode
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from django.utils import timezone
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from oidc_provider.lib.errors import *
from oidc_provider.lib.utils.params import *
from oidc_provider.lib.utils.token import *
from oidc_provider.models import *
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from oidc_provider import settings
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logger = logging.getLogger(__name__)
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class AuthorizeEndpoint(object):
def __init__(self, request):
self.request = request
self.params = Params()
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self._extract_params()
# Determine which flow to use.
if self.params.response_type in ['code']:
self.grant_type = 'authorization_code'
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elif self.params.response_type in ['id_token', 'id_token token', 'token']:
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self.grant_type = 'implicit'
else:
self.grant_type = None
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# Determine if it's an OpenID Authentication request (or OAuth2).
self.is_authentication = 'openid' in self.params.scope
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def _extract_params(self):
"""
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Get all the params used by the Authorization Code Flow
(and also for the Implicit).
See: http://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
"""
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# Because in this endpoint we handle both GET
# and POST request.
query_dict = (self.request.POST if self.request.method == 'POST'
else self.request.GET)
self.params.client_id = query_dict.get('client_id', '')
self.params.redirect_uri = query_dict.get('redirect_uri', '')
self.params.response_type = query_dict.get('response_type', '')
self.params.scope = query_dict.get('scope', '').split()
self.params.state = query_dict.get('state', '')
self.params.nonce = query_dict.get('nonce', '')
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# PKCE parameters.
self.params.code_challenge = query_dict.get('code_challenge')
self.params.code_challenge_method = query_dict.get('code_challenge_method')
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def validate_params(self):
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try:
self.client = Client.objects.get(client_id=self.params.client_id)
except Client.DoesNotExist:
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logger.debug('[Authorize] Invalid client identifier: %s', self.params.client_id)
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raise ClientIdError()
if self.is_authentication and not self.params.redirect_uri:
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logger.debug('[Authorize] Missing redirect uri.')
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raise RedirectUriError()
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if not self.grant_type:
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logger.debug('[Authorize] Invalid response type: %s', self.params.response_type)
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raise AuthorizeError(self.params.redirect_uri, 'unsupported_response_type',
self.grant_type)
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if self.is_authentication and self.grant_type == 'implicit' and not self.params.nonce:
raise AuthorizeError(self.params.redirect_uri, 'invalid_request',
self.grant_type)
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if self.is_authentication and self.params.response_type != self.client.response_type:
raise AuthorizeError(self.params.redirect_uri, 'invalid_request',
self.grant_type)
clean_redirect_uri = urlsplit(self.params.redirect_uri)
clean_redirect_uri = urlunsplit(clean_redirect_uri._replace(query=''))
if not (clean_redirect_uri in self.client.redirect_uris):
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logger.debug('[Authorize] Invalid redirect uri: %s', self.params.redirect_uri)
raise RedirectUriError()
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# PKCE validation of the transformation method.
if self.params.code_challenge and self.params.code_challenge_method:
if not (self.params.code_challenge_method in ['plain', 'S256']):
raise AuthorizeError(self.params.redirect_uri, 'invalid_request', self.grant_type)
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def create_response_uri(self):
uri = urlsplit(self.params.redirect_uri)
query_params = parse_qs(uri.query)
query_fragment = parse_qs(uri.fragment)
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try:
if self.grant_type == 'authorization_code':
code = create_code(
user=self.request.user,
client=self.client,
scope=self.params.scope,
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nonce=self.params.nonce,
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is_authentication=self.is_authentication,
code_challenge=self.params.code_challenge,
code_challenge_method=self.params.code_challenge_method)
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code.save()
query_params['code'] = code.code
query_params['state'] = self.params.state if self.params.state else ''
elif self.grant_type == 'implicit':
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# We don't need id_token if it's an OAuth2 request.
if self.is_authentication:
id_token_dic = create_id_token(
user=self.request.user,
aud=self.client.client_id,
nonce=self.params.nonce)
query_fragment['id_token'] = encode_id_token(id_token_dic)
else:
id_token_dic = {}
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token = create_token(
user=self.request.user,
client=self.client,
id_token_dic=id_token_dic,
scope=self.params.scope)
# Store the token.
token.save()
query_fragment['token_type'] = 'bearer'
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# TODO: Create setting 'OIDC_TOKEN_EXPIRE'.
query_fragment['expires_in'] = 60 * 10
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# Check if response_type is an OpenID request with value 'id_token token'
# or it's an OAuth2 Implicit Flow request.
if self.params.response_type in ['id_token token', 'token']:
query_fragment['access_token'] = token.access_token
query_fragment['state'] = self.params.state if self.params.state else ''
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except Exception as error:
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logger.debug('[Authorize] Error when trying to create response uri: %s', error)
raise AuthorizeError(
self.params.redirect_uri,
'server_error',
self.grant_type)
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uri = uri._replace(query=urlencode(query_params, doseq=True))
uri = uri._replace(fragment=urlencode(query_fragment, doseq=True))
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return urlunsplit(uri)
def set_client_user_consent(self):
"""
Save the user consent given to a specific client.
Return None.
"""
expires_at = timezone.now() + timedelta(
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days=settings.get('OIDC_SKIP_CONSENT_EXPIRE'))
uc, created = UserConsent.objects.get_or_create(
user=self.request.user,
client=self.client,
defaults={'expires_at': expires_at})
uc.scope = self.params.scope
# Rewrite expires_at if object already exists.
if not created:
uc.expires_at = expires_at
uc.save()
def client_has_user_consent(self):
"""
Check if already exists user consent for some client.
Return bool.
"""
value = False
try:
uc = UserConsent.objects.get(user=self.request.user,
client=self.client)
if (set(self.params.scope).issubset(uc.scope)) and \
not (uc.has_expired()):
value = True
except UserConsent.DoesNotExist:
pass
return value