Wire JWT lifetimes to settings, read secret key from env

core/api.py

@@ -1,5 +1,5 @@
 from decimal import Decimal
-from datetime import datetime, timedelta, date
+from datetime import datetime, timedelta, timezone, date
 from typing import List
 import jwt
 from django.conf import settings
@@ -22,31 +22,30 @@ class JWTAuth(HttpBearer):
                 return None
             user = User.objects.get(id=payload["user_id"])
             return user
-        except (jwt.PyJWTError, User.DoesNotExist):
+        except (jwt.PyJWTError, User.DoesNotExist, KeyError):
             return None
 
 
 auth = JWTAuth()
 
 
-def generate_access_token(user: User) -> str:
+def _generate_token(user: User, token_type: str, lifetime: timedelta) -> str:
+    now = datetime.now(timezone.utc)
     payload = {
         "user_id": user.id,
-        "type": "access",
-        "exp": datetime.utcnow() + timedelta(minutes=30),
-        "iat": datetime.utcnow(),
+        "type": token_type,
+        "exp": now + lifetime,
+        "iat": now,
     }
     return jwt.encode(payload, settings.SECRET_KEY, algorithm="HS256")
 
 
+def generate_access_token(user: User) -> str:
+    return _generate_token(user, "access", settings.JWT_ACCESS_TOKEN_LIFETIME)
+
+
 def generate_refresh_token(user: User) -> str:
-    payload = {
-        "user_id": user.id,
-        "type": "refresh",
-        "exp": datetime.utcnow() + timedelta(days=14),
-        "iat": datetime.utcnow(),
-    }
-    return jwt.encode(payload, settings.SECRET_KEY, algorithm="HS256")
+    return _generate_token(user, "refresh", settings.JWT_REFRESH_TOKEN_LIFETIME)
 
 
 # Schemas
@@ -190,7 +189,7 @@ def refresh_token_view(request, payload: RefreshIn):
         user = User.objects.get(id=data["user_id"])
         new_access_token = generate_access_token(user)
         return {"access_token": new_access_token}
-    except (jwt.PyJWTError, User.DoesNotExist):
+    except (jwt.PyJWTError, User.DoesNotExist, KeyError):
         raise HttpError(401, "Invalid or expired refresh token")
 
 

core/settings.py

@@ -17,17 +17,43 @@ import os
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
 
+DATA_DIR = BASE_DIR / 'data'
+
 
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/6.1/howto/deployment/checklist/
 
+def _read_secret_key() -> str:
+    """Prefer DJANGO_SECRET_KEY, else a key persisted in the (gitignored) data dir."""
+    env_key = os.getenv('DJANGO_SECRET_KEY', '').strip()
+    if env_key:
+        return env_key
+
+    key_file = DATA_DIR / 'secret_key.txt'
+    if key_file.exists():
+        stored = key_file.read_text().strip()
+        if stored:
+            return stored
+
+    from django.core.management.utils import get_random_secret_key
+
+    generated = get_random_secret_key()
+    key_file.parent.mkdir(parents=True, exist_ok=True)
+    key_file.write_text(generated)
+    key_file.chmod(0o600)
+    return generated
+
+
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = 'django-insecure-m#==%hz74d192o)4!#_!dpz%$yox@!hkabc9)pggkkiuvc7((q'
+# This also signs every JWT, so leaking it means anyone can forge a token.
+SECRET_KEY = _read_secret_key()
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = False
 
-ALLOWED_HOSTS = ['*']
+# Lifetimes for the hand-rolled JWTs issued in core/api.py.
+JWT_ACCESS_TOKEN_LIFETIME = timedelta(days=int(os.getenv('JWT_ACCESS_DAYS', '14')))
+JWT_REFRESH_TOKEN_LIFETIME = timedelta(days=int(os.getenv('JWT_REFRESH_DAYS', '30')))
 
 ALLOWED_HOSTS = os.getenv(
     "ALLOWED_HOSTS", 
@@ -107,7 +133,7 @@ WSGI_APPLICATION = 'core.wsgi.application'
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': BASE_DIR / 'data' / 'db.sqlite3',
+        'NAME': DATA_DIR / 'db.sqlite3',
     }
 }
 
@@ -168,7 +194,3 @@ SESSION_ENGINE = "django.contrib.sessions.backends.db"
 SESSION_COOKIE_AGE = 1209600  # Persist session for 2 weeks (in seconds)
 SESSION_SAVE_EVERY_REQUEST = True
 SESSION_COOKIE_HTTPONLY = True
-NINJA_JWT = {
-    'ACCESS_TOKEN_LIFETIME': timedelta(days=14),
-    'REFRESH_TOKEN_LIFETIME': timedelta(days=30),
-}