94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
import time
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from authlib.common.encoding import to_native
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from authlib.jose import jwt
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class JWTBearerTokenGenerator:
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"""A JSON Web Token formatted bearer token generator for jwt-bearer grant type.
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This token generator can be registered into authorization server::
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authorization_server.register_token_generator(
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'urn:ietf:params:oauth:grant-type:jwt-bearer',
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JWTBearerTokenGenerator(private_rsa_key),
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)
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In this way, we can generate the token into JWT format. And we don't have to
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save this token into database, since it will be short time valid. Consider to
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rewrite ``JWTBearerGrant.save_token``::
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class MyJWTBearerGrant(JWTBearerGrant):
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def save_token(self, token):
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pass
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:param secret_key: private RSA key in bytes, JWK or JWK Set.
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:param issuer: a string or URI of the issuer
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:param alg: ``alg`` to use in JWT
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"""
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DEFAULT_EXPIRES_IN = 3600
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def __init__(self, secret_key, issuer=None, alg='RS256'):
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self.secret_key = secret_key
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self.issuer = issuer
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self.alg = alg
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@staticmethod
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def get_allowed_scope(client, scope):
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if scope:
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scope = client.get_allowed_scope(scope)
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return scope
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@staticmethod
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def get_sub_value(user):
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"""Return user's ID as ``sub`` value in token payload. For instance::
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@staticmethod
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def get_sub_value(user):
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return str(user.id)
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"""
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return user.get_user_id()
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def get_token_data(self, grant_type, client, expires_in, user=None, scope=None):
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scope = self.get_allowed_scope(client, scope)
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issued_at = int(time.time())
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data = {
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'scope': scope,
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'grant_type': grant_type,
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'iat': issued_at,
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'exp': issued_at + expires_in,
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'client_id': client.get_client_id(),
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}
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if self.issuer:
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data['iss'] = self.issuer
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if user:
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data['sub'] = self.get_sub_value(user)
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return data
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def generate(self, grant_type, client, user=None, scope=None, expires_in=None):
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"""Generate a bearer token for OAuth 2.0 authorization token endpoint.
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:param client: the client that making the request.
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:param grant_type: current requested grant_type.
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:param user: current authorized user.
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:param expires_in: if provided, use this value as expires_in.
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:param scope: current requested scope.
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:return: Token dict
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"""
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if expires_in is None:
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expires_in = self.DEFAULT_EXPIRES_IN
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token_data = self.get_token_data(grant_type, client, expires_in, user, scope)
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access_token = jwt.encode({'alg': self.alg}, token_data, key=self.secret_key, check=False)
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token = {
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'token_type': 'Bearer',
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'access_token': to_native(access_token),
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'expires_in': expires_in
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}
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if scope:
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token['scope'] = scope
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return token
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def __call__(self, grant_type, client, user=None, scope=None,
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expires_in=None, include_refresh_token=True):
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# there is absolutely no refresh token in JWT format
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return self.generate(grant_type, client, user, scope, expires_in)
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