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-rw-r--r--gn_auth/auth/authentication/oauth2/models/jwtrefreshtoken.py139
1 files changed, 139 insertions, 0 deletions
diff --git a/gn_auth/auth/authentication/oauth2/models/jwtrefreshtoken.py b/gn_auth/auth/authentication/oauth2/models/jwtrefreshtoken.py
new file mode 100644
index 0000000..40b1554
--- /dev/null
+++ b/gn_auth/auth/authentication/oauth2/models/jwtrefreshtoken.py
@@ -0,0 +1,139 @@
+"""
+Refresh tokens for JWTs
+
+Refresh tokens are not supported directly by JWTs. This therefore provides a
+form of extension to JWTs.
+"""
+import uuid
+import datetime
+from typing import Optional
+from dataclasses import dataclass
+
+from authlib.oauth2.rfc6749 import TokenMixin, InvalidGrantError
+
+from pymonad.maybe import Just, Maybe, Nothing
+from pymonad.tools import monad_from_none_or_value
+
+from gn_auth.auth.db import sqlite3 as db
+from gn_auth.auth.authentication.users import User, user_by_id
+
+from gn_auth.auth.authentication.oauth2.models.oauth2client import (
+ OAuth2Client,
+ client as fetch_client)
+
+@dataclass(frozen=True)
+class JWTRefreshToken(TokenMixin):# pylint: disable=[too-many-instance-attributes]
+ """Class representing a JWT refresh token."""
+ token: str
+ client: OAuth2Client
+ user: User
+ issued_with: uuid.UUID
+ issued_at: datetime.datetime
+ expires: datetime.datetime
+ scope: str
+ revoked: bool
+ parent_of: Optional[str] = None
+
+ def is_expired(self):
+ """Check whether refresh token has expired."""
+ return self.expires <= datetime.datetime.now()
+
+ def get_scope(self):
+ return self.scope
+
+ def get_expires_in(self):
+ return (self.expires - self.issued_at).total_seconds()
+
+ def is_revoked(self):
+ """Check whether refresh token is revoked"""
+ return self.revoked
+
+ def check_client(self, client: OAuth2Client) -> bool:
+ """Check whether the token is issued to given `client`."""
+ return client.client_id == self.client.client_id
+
+
+def revoke_refresh_token(conn: db.DbConnection, token: JWTRefreshToken) -> None:
+ """Revoke a refresh token."""
+ # TODO: this token has been used before - revoke tree.
+ # TODO: Fetch all the children tokens
+ # HINT:
+ # SELECT t1.token, t1.parent_of FROM jwt_refresh_tokens AS t1
+ # LEFT JOIN jwt_refresh_tokens AS t2 ON t1.parent_of=t2.token
+ # TODO: Revoke all children tokens including the treeroot token
+ raise NotImplementedError()
+
+
+def save_refresh_token(conn: db.DbConnection, token: JWTRefreshToken) -> None:
+ """Save the Refresh tokens into the database."""
+ with db.cursor(conn) as cursor:
+ cursor.execute(
+ ("INSERT INTO jwt_refresh_tokens"
+ "(token, client_id, user_id, issued_with, issued_at, expires, "
+ "scope, revoked, parent_of) "
+ "VALUES"
+ "(:token, :client_id, :user_id, :issued_with, :issued_at, "
+ ":expires, :scope, :revoked, :parent_of) "
+ "ON CONFLICT (token) DO UPDATE SET parent_of=:parent_of"),
+ {
+ "token": token.token,
+ "client_id": str(token.client.client_id),
+ "user_id": str(token.user.user_id),
+ "issued_with": str(token.issued_with),
+ "issued_at": token.issued_at.timestamp(),
+ "expires": token.expires.timestamp(),
+ "scope": token.get_scope(),
+ "revoked": token.revoked,
+ "parent_of": token.parent_of
+ })
+
+
+def load_refresh_token(conn: db.DbConnection, token: str) -> Maybe:
+ """Load a refresh_token by its token string."""
+ def __process_results__(results):
+ _user = user_by_id(conn, uuid.UUID(results["user_id"]))
+ _now = datetime.datetime.now()
+ return JWTRefreshToken(
+ token=results["token"],
+ client=fetch_client(
+ conn, uuid.UUID(results["client_id"]), user=_user).maybe(
+ OAuth2Client(uuid.uuid4(), "secret", _now, _now, {}, _user),
+ lambda _client: _client),
+ user=_user,
+ issued_with=uuid.UUID(results["issued_with"]),
+ issued_at=datetime.datetime.fromtimestamp(results["issued_at"]),
+ expires=datetime.datetime.fromtimestamp(results["expires"]),
+ scope=results["scope"],
+ revoked=bool(int(results["revoked"])),
+ parent_of=results["parent_of"]
+ )
+
+ with db.cursor(conn) as cursor:
+ cursor.execute("SELECT * FROM jwt_refresh_tokens WHERE token=:token",
+ {"token": token})
+ return monad_from_none_or_value(Nothing, Just, cursor.fetchone()).then(
+ __process_results__)
+
+
+def link_child_token(conn: db.DbConnection, parenttoken: str, childtoken: str):
+ """Link child token."""
+ _parent = load_refresh_token(conn, parenttoken).maybe(
+ None, lambda _tok: _tok)
+ if _parent is None:
+ raise InvalidGrantError("Token not found.")
+
+ with db.cursor(conn) as cursor:
+ cursor.execute(("UPDATE jwt_refresh_tokens SET parent_of=:childtoken "
+ "WHERE token=:parenttoken"),
+ {"parenttoken": parenttoken, "childtoken": childtoken})
+
+
+def is_refresh_token_valid(token: JWTRefreshToken, client: OAuth2Client) -> bool:
+ """Check whether a token is valid."""
+ return (
+ (token.client.client_id == client.client_id)
+ and
+ (not token.is_expired())
+ and
+ (not token.revoked)
+ )