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JonnyWong16 2021-10-14 22:34:45 -07:00
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lib/oauthlib/oauth2/rfc6749/endpoints/metadata.py Normal file
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"""
oauthlib.oauth2.rfc6749.endpoint.metadata
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
An implementation of the `OAuth 2.0 Authorization Server Metadata`.
.. _`OAuth 2.0 Authorization Server Metadata`: https://tools.ietf.org/html/rfc8414
"""
import copy
import json
import logging
from .. import grant_types
from .authorization import AuthorizationEndpoint
from .base import BaseEndpoint, catch_errors_and_unavailability
from .introspect import IntrospectEndpoint
from .revocation import RevocationEndpoint
from .token import TokenEndpoint
log = logging.getLogger(__name__)
class MetadataEndpoint(BaseEndpoint):
"""OAuth2.0 Authorization Server Metadata endpoint.
This specification generalizes the metadata format defined by
`OpenID Connect Discovery 1.0` in a way that is compatible
with OpenID Connect Discovery while being applicable to a wider set
of OAuth 2.0 use cases. This is intentionally parallel to the way
that OAuth 2.0 Dynamic Client Registration Protocol [`RFC7591`_]
generalized the dynamic client registration mechanisms defined by
OpenID Connect Dynamic Client Registration 1.0
in a way that is compatible with it.
.. _`OpenID Connect Discovery 1.0`: https://openid.net/specs/openid-connect-discovery-1_0.html
.. _`RFC7591`: https://tools.ietf.org/html/rfc7591
"""
def __init__(self, endpoints, claims={}, raise_errors=True):
assert isinstance(claims, dict)
for endpoint in endpoints:
assert isinstance(endpoint, BaseEndpoint)
BaseEndpoint.__init__(self)
self.raise_errors = raise_errors
self.endpoints = endpoints
self.initial_claims = claims
self.claims = self.validate_metadata_server()
@catch_errors_and_unavailability
def create_metadata_response(self, uri, http_method='GET', body=None,
headers=None):
"""Create metadata response
"""
headers = {
'Content-Type': 'application/json'
}
return headers, json.dumps(self.claims), 200
def validate_metadata(self, array, key, is_required=False, is_list=False, is_url=False, is_issuer=False):
if not self.raise_errors:
return
if key not in array:
if is_required:
raise ValueError("key {} is a mandatory metadata.".format(key))
elif is_issuer:
if not array[key].startswith("https"):
raise ValueError("key {}: {} must be an HTTPS URL".format(key, array[key]))
if "?" in array[key] or "&" in array[key] or "#" in array[key]:
raise ValueError("key {}: {} must not contain query or fragment components".format(key, array[key]))
elif is_url:
if not array[key].startswith("http"):
raise ValueError("key {}: {} must be an URL".format(key, array[key]))
elif is_list:
if not isinstance(array[key], list):
raise ValueError("key {}: {} must be an Array".format(key, array[key]))
for elem in array[key]:
if not isinstance(elem, str):
raise ValueError("array {}: {} must contains only string (not {})".format(key, array[key], elem))
def validate_metadata_token(self, claims, endpoint):
"""
If the token endpoint is used in the grant type, the value of this
parameter MUST be the same as the value of the "grant_type"
parameter passed to the token endpoint defined in the grant type
definition.
"""
self._grant_types.extend(endpoint._grant_types.keys())
claims.setdefault("token_endpoint_auth_methods_supported", ["client_secret_post", "client_secret_basic"])
self.validate_metadata(claims, "token_endpoint_auth_methods_supported", is_list=True)
self.validate_metadata(claims, "token_endpoint_auth_signing_alg_values_supported", is_list=True)
self.validate_metadata(claims, "token_endpoint", is_required=True, is_url=True)
def validate_metadata_authorization(self, claims, endpoint):
claims.setdefault("response_types_supported",
list(filter(lambda x: x != "none", endpoint._response_types.keys())))
claims.setdefault("response_modes_supported", ["query", "fragment"])
# The OAuth2.0 Implicit flow is defined as a "grant type" but it is not
# using the "token" endpoint, as such, we have to add it explicitly to
# the list of "grant_types_supported" when enabled.
if "token" in claims["response_types_supported"]:
self._grant_types.append("implicit")
self.validate_metadata(claims, "response_types_supported", is_required=True, is_list=True)
self.validate_metadata(claims, "response_modes_supported", is_list=True)
if "code" in claims["response_types_supported"]:
code_grant = endpoint._response_types["code"]
if not isinstance(code_grant, grant_types.AuthorizationCodeGrant) and hasattr(code_grant, "default_grant"):
code_grant = code_grant.default_grant
claims.setdefault("code_challenge_methods_supported",
list(code_grant._code_challenge_methods.keys()))
self.validate_metadata(claims, "code_challenge_methods_supported", is_list=True)
self.validate_metadata(claims, "authorization_endpoint", is_required=True, is_url=True)
def validate_metadata_revocation(self, claims, endpoint):
claims.setdefault("revocation_endpoint_auth_methods_supported",
["client_secret_post", "client_secret_basic"])
self.validate_metadata(claims, "revocation_endpoint_auth_methods_supported", is_list=True)
self.validate_metadata(claims, "revocation_endpoint_auth_signing_alg_values_supported", is_list=True)
self.validate_metadata(claims, "revocation_endpoint", is_required=True, is_url=True)
def validate_metadata_introspection(self, claims, endpoint):
claims.setdefault("introspection_endpoint_auth_methods_supported",
["client_secret_post", "client_secret_basic"])
self.validate_metadata(claims, "introspection_endpoint_auth_methods_supported", is_list=True)
self.validate_metadata(claims, "introspection_endpoint_auth_signing_alg_values_supported", is_list=True)
self.validate_metadata(claims, "introspection_endpoint", is_required=True, is_url=True)
def validate_metadata_server(self):
"""
Authorization servers can have metadata describing their
configuration. The following authorization server metadata values
are used by this specification. More details can be found in
`RFC8414 section 2`_ :
issuer
REQUIRED
authorization_endpoint
URL of the authorization server's authorization endpoint
[`RFC6749#Authorization`_]. This is REQUIRED unless no grant types are supported
that use the authorization endpoint.
token_endpoint
URL of the authorization server's token endpoint [`RFC6749#Token`_]. This
is REQUIRED unless only the implicit grant type is supported.
scopes_supported
RECOMMENDED.
response_types_supported
REQUIRED.
Other OPTIONAL fields:
jwks_uri,
registration_endpoint,
response_modes_supported
grant_types_supported
OPTIONAL. JSON array containing a list of the OAuth 2.0 grant
type values that this authorization server supports. The array
values used are the same as those used with the "grant_types"
parameter defined by "OAuth 2.0 Dynamic Client Registration
Protocol" [`RFC7591`_]. If omitted, the default value is
"["authorization_code", "implicit"]".
token_endpoint_auth_methods_supported
token_endpoint_auth_signing_alg_values_supported
service_documentation
ui_locales_supported
op_policy_uri
op_tos_uri
revocation_endpoint
revocation_endpoint_auth_methods_supported
revocation_endpoint_auth_signing_alg_values_supported
introspection_endpoint
introspection_endpoint_auth_methods_supported
introspection_endpoint_auth_signing_alg_values_supported
code_challenge_methods_supported
Additional authorization server metadata parameters MAY also be used.
Some are defined by other specifications, such as OpenID Connect
Discovery 1.0 [`OpenID.Discovery`_].
.. _`RFC8414 section 2`: https://tools.ietf.org/html/rfc8414#section-2
.. _`RFC6749#Authorization`: https://tools.ietf.org/html/rfc6749#section-3.1
.. _`RFC6749#Token`: https://tools.ietf.org/html/rfc6749#section-3.2
.. _`RFC7591`: https://tools.ietf.org/html/rfc7591
.. _`OpenID.Discovery`: https://openid.net/specs/openid-connect-discovery-1_0.html
"""
claims = copy.deepcopy(self.initial_claims)
self.validate_metadata(claims, "issuer", is_required=True, is_issuer=True)
self.validate_metadata(claims, "jwks_uri", is_url=True)
self.validate_metadata(claims, "scopes_supported", is_list=True)
self.validate_metadata(claims, "service_documentation", is_url=True)
self.validate_metadata(claims, "ui_locales_supported", is_list=True)
self.validate_metadata(claims, "op_policy_uri", is_url=True)
self.validate_metadata(claims, "op_tos_uri", is_url=True)
self._grant_types = []
for endpoint in self.endpoints:
if isinstance(endpoint, TokenEndpoint):
self.validate_metadata_token(claims, endpoint)
if isinstance(endpoint, AuthorizationEndpoint):
self.validate_metadata_authorization(claims, endpoint)
if isinstance(endpoint, RevocationEndpoint):
self.validate_metadata_revocation(claims, endpoint)
if isinstance(endpoint, IntrospectEndpoint):
self.validate_metadata_introspection(claims, endpoint)
# "grant_types_supported" is a combination of all OAuth2 grant types
# allowed in the current provider implementation.
claims.setdefault("grant_types_supported", self._grant_types)
self.validate_metadata(claims, "grant_types_supported", is_list=True)
return claims