Implement feature to allow customizing token claim from user attributes

ninja_simple_jwt/auth/ninja_auth.py

@@ -1,10 +1,13 @@
+from django.contrib.auth.base_user import AbstractBaseUser
+from django.contrib.auth.models import AnonymousUser
 from django.http import HttpRequest
 from jwt import PyJWTError
 from ninja.errors import AuthenticationError
 from ninja.security import HttpBearer
 from ninja.security.http import DecodeError
 
 from ninja_simple_jwt.jwt.token_operations import TokenTypes, decode_token
+from ninja_simple_jwt.settings import ninja_simple_jwt_settings
 
 
 class HttpJwtAuth(HttpBearer):
@@ -16,11 +19,15 @@ def authenticate(self, request: HttpRequest, token: str) -> bool:
         except PyJWTError as e:
             raise AuthenticationError(e)
 
-        setattr(request.user, "id", access_token["user_id"])
-        setattr(request.user, "username", access_token["username"])
+        self.set_token_claims_to_user(request.user, access_token)
 
         return True
 
+    @staticmethod
+    def set_token_claims_to_user(user: AbstractBaseUser | AnonymousUser, token: dict) -> None:
+        for claim, user_attribute in ninja_simple_jwt_settings.TOKEN_CLAIM_USER_ATTRIBUTE_MAP.items():
+            setattr(user, user_attribute, token.get(claim))
+
     def decode_authorization(self, value: str) -> str:
         parts = value.split(" ")
         if len(parts) != 2 or parts[0].lower() != "bearer":

ninja_simple_jwt/auth/views/api.py

@@ -1,6 +1,7 @@
 from datetime import UTC, datetime
 
 from django.contrib.auth import authenticate
+from django.contrib.auth.signals import user_logged_in
 from django.http import HttpRequest, HttpResponse
 from jwt.exceptions import PyJWTError
 from ninja import Router
@@ -14,7 +15,7 @@
     WebSignInResponse,
 )
 from ninja_simple_jwt.jwt.token_operations import (
-    get_access_token,
+    get_access_token_for_user,
     get_access_token_from_refresh_token,
     get_refresh_token_for_user,
 )
@@ -28,10 +29,11 @@
 def mobile_sign_in(request: HttpRequest, payload: SignInRequest) -> dict:
     payload_data = payload.dict()
     user = authenticate(username=payload_data["username"], password=payload_data["password"])
+    user_logged_in.send(sender=user.__class__, request=request, user=user)
     if user is None:
         raise AuthenticationError()
     refresh_token, _ = get_refresh_token_for_user(user)
-    access_token, _ = get_access_token(str(user.pk), user.get_username())
+    access_token, _ = get_access_token_for_user(user)
     return {"refresh": refresh_token, "access": access_token}
 
 
@@ -50,10 +52,11 @@ def mobile_token_refresh(request: HttpRequest, payload: MobileTokenRefreshReques
 def web_sign_in(request: HttpRequest, payload: SignInRequest, response: HttpResponse) -> dict:
     payload_data = payload.dict()
     user = authenticate(username=payload_data["username"], password=payload_data["password"])
+    user_logged_in.send(sender=user.__class__, request=request, user=user)
     if user is None:
         raise AuthenticationError()
     refresh_token, refresh_token_payload = get_refresh_token_for_user(user)
-    access_token, _ = get_access_token(str(user.pk), user.get_username())
+    access_token, _ = get_access_token_for_user(user)
     response.set_cookie(
         key=ninja_simple_jwt_settings.JWT_REFRESH_COOKIE_NAME,
         value=refresh_token,

ninja_simple_jwt/jwt/json_encode.py

@@ -0,0 +1,12 @@
+from typing import Any
+from uuid import UUID
+
+from django.core.serializers.json import DjangoJSONEncoder
+
+
+class TokenUserEncoder(DjangoJSONEncoder):
+    def default(self, o: Any) -> Any:
+        if isinstance(o, UUID):
+            return str(o)
+
+        return super().default(o)

ninja_simple_jwt/jwt/token_operations.py

@@ -1,14 +1,15 @@
 import time
 from datetime import datetime
 from enum import Enum
-from typing import Any, Tuple, TypedDict
+from json import JSONEncoder
+from typing import Any, Optional, Tuple
 from uuid import uuid4
 
 import jwt
 from django.contrib.auth.models import AbstractBaseUser
 from django.utils import timezone
+from django.utils.module_loading import import_string
 from jwt import ExpiredSignatureError, InvalidKeyError, InvalidTokenError
-from pydantic import UUID4
 
 from ninja_simple_jwt.jwt.key_retrieval import InMemoryJwtKeyPair
 from ninja_simple_jwt.settings import ninja_simple_jwt_settings
@@ -19,32 +20,35 @@ class TokenTypes(str, Enum):
     REFRESH = "refresh"
 
 
-class TokenPayload(TypedDict):
-    user_id: str
-    username: str
+TokenUserJsonEncoder = import_string(ninja_simple_jwt_settings.TOKEN_USER_ENCODER_CLS)
 
 
-class DecodedTokenPayload(TokenPayload):
-    token_type: TokenTypes
-    jti: UUID4
-    exp: int
-    iat: int
+def get_refresh_token_for_user(user: AbstractBaseUser) -> Tuple[str, dict]:
+    payload = get_token_payload_for_user(user)
+    return encode_token(payload, TokenTypes.REFRESH, json_encoder=TokenUserJsonEncoder)
 
 
-def get_refresh_token_for_user(user: AbstractBaseUser) -> Tuple[str, dict]:
-    return encode_token({"username": user.get_username(), "user_id": user.pk}, TokenTypes.REFRESH)
+def get_access_token_for_user(user: AbstractBaseUser) -> Tuple[str, dict]:
+    payload = get_token_payload_for_user(user)
+    return encode_token(payload, TokenTypes.ACCESS, json_encoder=TokenUserJsonEncoder)
 
 
-def get_access_token(user_id: str, user_name: str) -> Tuple[str, dict]:
-    return encode_token({"username": user_name, "user_id": user_id}, TokenTypes.ACCESS)
+def get_token_payload_for_user(user: AbstractBaseUser) -> dict:
+    return {
+        claim: getattr(user, user_attr)
+        for claim, user_attr in ninja_simple_jwt_settings.TOKEN_CLAIM_USER_ATTRIBUTE_MAP.items()
+    }
 
 
 def get_access_token_from_refresh_token(refresh_token: str) -> Tuple[str, dict]:
     decoded = decode_token(refresh_token, token_type=TokenTypes.REFRESH, verify=True)
-    return get_access_token(user_id=decoded["user_id"], user_name=decoded["username"])
+    payload = {claim: decoded.get(claim) for claim in ninja_simple_jwt_settings.TOKEN_CLAIM_USER_ATTRIBUTE_MAP}
+    return encode_token(payload, TokenTypes.ACCESS)
 
 
-def encode_token(payload: TokenPayload, token_type: TokenTypes, **additional_headers: Any) -> Tuple[str, dict]:
+def encode_token(
+    payload: dict, token_type: TokenTypes, json_encoder: Optional[type[JSONEncoder]] = None, **additional_headers: Any
+) -> Tuple[str, dict]:
     now = timezone.now()
     if token_type == TokenTypes.REFRESH:
         expiry = now + ninja_simple_jwt_settings.JWT_REFRESH_TOKEN_LIFETIME
@@ -53,20 +57,25 @@ def encode_token(payload: TokenPayload, token_type: TokenTypes, **additional_hea
 
     payload_data = {
         **payload,
-        "user_id": str(payload["user_id"]),
         "jti": uuid4().hex,
         "exp": int(time.mktime(expiry.timetuple())),
         "iat": int(time.mktime(now.timetuple())),
         "token_type": token_type,
     }
 
     return (
-        jwt.encode(payload_data, InMemoryJwtKeyPair.private_key, algorithm="RS256", headers=additional_headers),
+        jwt.encode(
+            payload_data,
+            InMemoryJwtKeyPair.private_key,
+            algorithm="RS256",
+            headers=additional_headers,
+            json_encoder=json_encoder,
+        ),
         payload_data,
     )
 
 
-def decode_token(token: str, token_type: TokenTypes, verify: bool = True) -> DecodedTokenPayload:
+def decode_token(token: str, token_type: TokenTypes, verify: bool = True) -> dict:
     if verify is True:
         decoded = jwt.decode(token, InMemoryJwtKeyPair.public_key, algorithms=["RS256"])
         _verify_exp(decoded)

ninja_simple_jwt/settings.py

@@ -19,6 +19,8 @@ class NinjaSimpleJwtSettingsDict(TypedDict):
     WEB_REFRESH_COOKIE_HTTP_ONLY: NotRequired[bool]
     WEB_REFRESH_COOKIE_SAME_SITE_POLICY: NotRequired[str]
     WEB_REFRESH_COOKIE_PATH: NotRequired[str]
+    TOKEN_CLAIM_USER_ATTRIBUTE_MAP: NotRequired[dict[str, str]]
+    TOKEN_USER_ENCODER_CLS: NotRequired[str]
 
 
 DEFAULTS: NinjaSimpleJwtSettingsDict = {
@@ -32,6 +34,12 @@ class NinjaSimpleJwtSettingsDict(TypedDict):
     "WEB_REFRESH_COOKIE_HTTP_ONLY": True,
     "WEB_REFRESH_COOKIE_SAME_SITE_POLICY": "Strict",
     "WEB_REFRESH_COOKIE_PATH": "/api/auth/web/token-refresh",
+    "TOKEN_CLAIM_USER_ATTRIBUTE_MAP": {
+        "user_id": "id",
+        "username": "username",
+        "last_login": "last_login",
+    },
+    "TOKEN_USER_ENCODER_CLS": "ninja_simple_jwt.jwt.json_encode.TokenUserEncoder",
 }
 
 EMPTY_SETTINGS: NinjaSimpleJwtSettingsDict = {}

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = django-ninja-simple-jwt
-version = 0.3.0
+version = 0.4.0
 description = Simple JWT-based authentication using Django and Django-ninja
 long_description = file: README.md
 url = https://github.com/oscarychen/django-ninja-simple-jwt

tests/settings.py

@@ -74,6 +74,7 @@
     "django.contrib.staticfiles",
     "django.contrib.admin",
     "django.contrib.messages",
+    "ninja_simple_jwt",
     "tests",
 )
 
@@ -110,3 +111,8 @@
         },
     },
 }
+
+NINJA_SIMPLE_JWT = {
+    "JWT_PRIVATE_KEY_PATH": "tests/mock-jwt-signing.pem",
+    "JWT_PUBLIC_KEY_PATH": "tests/mock-jwt-signing.pub",
+}

tests/test_jwt/test_json_encode.py

@@ -0,0 +1,23 @@
+import json
+from datetime import datetime
+from uuid import uuid4
+
+from django.test import TestCase
+
+from ninja_simple_jwt.jwt.json_encode import TokenUserEncoder
+
+
+class TestDjangoUserEncoder(TestCase):
+    def test_encoder_can_serialize_datetime(self) -> None:
+        test_data = datetime(2012, 1, 14, 12, 0, 1)
+
+        result = json.dumps(test_data, cls=TokenUserEncoder)
+
+        self.assertEqual('"2012-01-14T12:00:01"', result)
+
+    def test_encoder_can_serialize_uuid(self) -> None:
+        test_uuid = uuid4()
+
+        result = json.dumps(test_uuid, cls=TokenUserEncoder)
+
+        self.assertEqual(f'"{str(test_uuid)}"', result)

tests/test_jwt/test_token_operations.py

@@ -6,7 +6,7 @@
 from ninja_simple_jwt.jwt.token_operations import TokenTypes, decode_token, encode_token
 
 
-class TestEncodeToken(TestCase):
+class TestEncodeDecodeToken(TestCase):
     def setUp(self) -> None:
         make_and_save_key_pair()