diff options
author | Frederick Muriuki Muriithi | 2024-04-18 20:15:25 +0300 |
---|---|---|
committer | Frederick Muriuki Muriithi | 2024-04-20 15:28:59 +0300 |
commit | cfda9d6cd15763e65fa851d964033e37f377239c (patch) | |
tree | 23e0dac4c1e7ab62a21fadac7b82a2d418373d29 /gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py | |
parent | d9b8b05a460535dfb09168d1958c047255ff0fa2 (diff) | |
download | gn-auth-cfda9d6cd15763e65fa851d964033e37f377239c.tar.gz |
Define and register grant for JWT tokens.
Diffstat (limited to 'gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py')
-rw-r--r-- | gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py b/gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py new file mode 100644 index 0000000..492009c --- /dev/null +++ b/gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py @@ -0,0 +1,89 @@ +"""JWT as Authorisation Grant""" +import uuid +from urllib.parse import urlparse +from datetime import datetime, timedelta + +from flask import request, current_app as app + +from authlib.jose import jwt +from authlib.jose.rfc7517.key_set import KeySet +from authlib.oauth2.rfc7523.jwt_bearer import JWTBearerGrant as _JWTBearerGrant +from authlib.oauth2.rfc7523.token import ( + JWTBearerTokenGenerator as _JWTBearerTokenGenerator) + +from gn_auth.auth.authentication.users import user_by_id +from gn_auth.auth.db.sqlite3 import connection, with_db_connection +from gn_auth.auth.authentication.oauth2.models.oauth2client import client +from gn_auth.auth.authentication.oauth2.grants.authorisation_code_grant import AuthorisationCodeGrant + + +class JWTBearerTokenGenerator(_JWTBearerTokenGenerator): + """ + A JSON Web Token formatted bearer token generator for jwt-bearer grant type. + """ + + DEFAULT_EXPIRES_IN = 300 + + def get_token_data(self, grant_type, client, expires_in=300, user=None, scope=None): + """Post process data to prevent JSON serialization problems.""" + tokendata = super().get_token_data( + grant_type, client, expires_in, user, scope) + return { + **{ + key: str(value) if key.endswith("_id") else value + for key, value in tokendata.items() + }, + "sub": str(tokendata["sub"])} + + +class JWTBearerGrant(_JWTBearerGrant, AuthorisationCodeGrant): + """Implement JWT as Authorisation Grant.""" + + + def create_authorization_response(self, redirect_uri: str, grant_user): + resp = super().create_authorization_response(redirect_uri, grant_user) + headers = dict(resp[2]) + location = urlparse(headers["Location"]) + query = { + key.strip(): value.strip() for key, value in + (item.split("=") for item in + (param.strip() for param in location.query.split("&")))} + parsed_redirect = urlparse(redirect_uri) + issued = datetime.now() + jwtkey = app.config["JWT_PRIVATE_KEY"] + jwttoken = jwt.encode( + {"alg": "RS256", "typ": "jwt", "kid": jwtkey.kid}, + { + "iss": str(self.client.client_id), + "sub": str(grant_user.user_id), + "aud": f"{parsed_redirect.scheme}://{parsed_redirect.netloc}", + "exp": (issued + timedelta(minutes=5)), + "nbf": int(issued.timestamp()), + "iat": int(issued.timestamp()), + "jti": str(uuid.uuid4()), + "code": query["code"]}, + jwtkey).decode("utf8") + return (302, "", [("Location", f"{location.geturl()}&jwt={jwttoken}")]) + + + def resolve_issuer_client(self, issuer): + """Fetch client via "iss" in assertion claims.""" + return with_db_connection( + lambda conn: self.server.query_client(issuer)) + + + def resolve_client_key(self, client, headers, payload): + """Resolve client key to decode assertion data.""" + return app.config["JWT_PUBLIC_KEY"] + + + def authenticate_user(self, subject): + """Authenticate user with the given assertion claims.""" + return with_db_connection(lambda conn: user_by_id(conn, subject)) + + + def has_granted_permission(self, client, user): + """ + Check if the client has permission to access the given user's resource. + """ + return True # TODO: Check this!!! |