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"""OAuth2 Client model."""
import json
import uuid
import datetime
from typing import Sequence, Optional, NamedTuple
from pymonad.maybe import Just, Maybe, Nothing
from gn3.auth import db
from gn3.auth.authentication.users import User, user_by_id, same_password
from gn3.auth.authorisation.errors import NotFoundError
class OAuth2Client(NamedTuple):
"""
Client to the OAuth2 Server.
This is defined according to the mixin at
https://docs.authlib.org/en/latest/specs/rfc6749.html#authlib.oauth2.rfc6749.ClientMixin
"""
client_id: uuid.UUID
client_secret: str
client_id_issued_at: datetime.datetime
client_secret_expires_at: datetime.datetime
client_metadata: dict
user: User
def check_client_secret(self, client_secret: str) -> bool:
"""Check whether the `client_secret` matches this client."""
return self.client_secret == client_secret
@property
def token_endpoint_auth_method(self) -> str:
"""Return the token endpoint authorisation method."""
return self.client_metadata.get("token_endpoint_auth_method", ["none"])
@property
def client_type(self) -> str:
"""
Return the token endpoint authorisation method.
Acceptable client types:
* public: Unable to use registered client secrets, e.g. browsers, apps
on mobile devices.
* confidential: able to securely authenticate with authorisation server
e.g. being able to keep their registered client secret safe.
"""
return self.client_metadata.get("client_type", "public")
def check_endpoint_auth_method(self, method: str, endpoint: str) -> bool:
"""
Check if the client supports the given method for the given endpoint.
Acceptable methods:
* none: Client is a public client and does not have a client secret
* client_secret_post: Client uses the HTTP POST parameters
* client_secret_basic: Client uses HTTP Basic
"""
if endpoint == "token":
return (method in self.token_endpoint_auth_method
and method == "client_secret_post")
if endpoint in ("introspection", "revoke"):
return (method in self.token_endpoint_auth_method
and method == "client_secret_basic")
return False
@property
def id(self):# pylint: disable=[invalid-name]
"""Return the client_id."""
return self.client_id
@property
def grant_types(self) -> Sequence[str]:
"""
Return the grant types that this client supports.
Valid grant types:
* authorisation_code
* implicit
* client_credentials
* password
"""
return self.client_metadata.get("grant_types", [])
def check_grant_type(self, grant_type: str) -> bool:
"""
Validate that client can handle the given grant types
"""
return grant_type in self.grant_types
@property
def redirect_uris(self) -> Sequence[str]:
"""Return the redirect_uris that this client supports."""
return self.client_metadata.get('redirect_uris', [])
def check_redirect_uri(self, redirect_uri: str) -> bool:
"""
Check whether the given `redirect_uri` is one of the expected ones.
"""
return redirect_uri in self.redirect_uris
@property
def response_types(self) -> Sequence[str]:
"""Return the response_types that this client supports."""
return self.client_metadata.get("response_type", [])
def check_response_type(self, response_type: str) -> bool:
"""Check whether this client supports `response_type`."""
return response_type in self.response_types
@property
def scope(self) -> Sequence[str]:
"""Return valid scopes for this client."""
return tuple(set(self.client_metadata.get("scope", [])))
def get_allowed_scope(self, scope: str) -> str:
"""Return list of scopes in `scope` that are supported by this client."""
if not bool(scope):
return ""
requested = scope.split()
return " ".join(sorted(set(
scp for scp in requested if scp in self.scope)))
def get_client_id(self):
"""Return this client's identifier."""
return self.client_id
def get_default_redirect_uri(self) -> str:
"""Return the default redirect uri"""
return self.client_metadata.get("default_redirect_uri", "")
def client(conn: db.DbConnection, client_id: uuid.UUID,
user: Optional[User] = None) -> Maybe:
"""Retrieve a client by its ID"""
with db.cursor(conn) as cursor:
cursor.execute(
"SELECT * FROM oauth2_clients WHERE client_id=?", (str(client_id),))
result = cursor.fetchone()
the_user = user
if result:
if not bool(the_user):
try:
the_user = user_by_id(conn, result["user_id"])
except NotFoundError as _nfe:
the_user = None
return Just(
OAuth2Client(uuid.UUID(result["client_id"]),
result["client_secret"],
datetime.datetime.fromtimestamp(
result["client_id_issued_at"]),
datetime.datetime.fromtimestamp(
result["client_secret_expires_at"]),
json.loads(result["client_metadata"]),
the_user))# type: ignore[arg-type]
return Nothing
def client_by_id_and_secret(conn: db.DbConnection, client_id: uuid.UUID,
client_secret: str) -> OAuth2Client:
"""Retrieve a client by its ID and secret"""
with db.cursor(conn) as cursor:
cursor.execute(
"SELECT * FROM oauth2_clients WHERE client_id=?",
(str(client_id),))
row = cursor.fetchone()
if bool(row) and same_password(client_secret, row["client_secret"]):
return OAuth2Client(
client_id, client_secret,
datetime.datetime.fromtimestamp(row["client_id_issued_at"]),
datetime.datetime.fromtimestamp(
row["client_secret_expires_at"]),
json.loads(row["client_metadata"]),
user_by_id(conn, uuid.UUID(row["user_id"])))
raise NotFoundError("Could not find client with the given credentials.")
def save_client(conn: db.DbConnection, the_client: OAuth2Client) -> OAuth2Client:
"""Persist the client details into the database."""
with db.cursor(conn) as cursor:
query = (
"INSERT INTO oauth2_clients "
"(client_id, client_secret, client_id_issued_at, "
"client_secret_expires_at, client_metadata, user_id) "
"VALUES "
"(:client_id, :client_secret, :client_id_issued_at, "
":client_secret_expires_at, :client_metadata, :user_id) "
"ON CONFLICT (client_id) DO UPDATE SET "
"client_secret=:client_secret, "
"client_id_issued_at=:client_id_issued_at, "
"client_secret_expires_at=:client_secret_expires_at, "
"client_metadata=:client_metadata, user_id=:user_id")
cursor.execute(
query,
{
"client_id": str(the_client.client_id),
"client_secret": the_client.client_secret,
"client_id_issued_at": (
the_client.client_id_issued_at.timestamp()),
"client_secret_expires_at": (
the_client.client_secret_expires_at.timestamp()),
"client_metadata": json.dumps(the_client.client_metadata),
"user_id": str(the_client.user.user_id)
})
return the_client
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