feat: implement API security measures phase 1

api/accounts/views.py

@@ -6,8 +6,16 @@ from rest_framework.permissions import AllowAny
 from rest_framework.request import Request
 from rest_framework.response import Response
 from rest_framework.throttling import AnonRateThrottle
+from rest_framework_simplejwt.exceptions import TokenError
+from rest_framework_simplejwt.tokens import RefreshToken
 
-from accounts.serializers import LoginSerializer, RegisterSerializer, UserSerializer
+from accounts.serializers import (
+    LoginSerializer,
+    LogoutSerializer,
+    RefreshRequestSerializer,
+    RegisterSerializer,
+    UserSerializer,
+)
 
 
 class AuthRateThrottle(AnonRateThrottle):
@@ -46,4 +54,68 @@ def login_view(request: Request) -> Response:
             "refresh": validated_data["refresh"],
         },
         status=status.HTTP_200_OK,
+    )
+
+
+@api_view(["POST"])
+@permission_classes([AllowAny])
+@throttle_classes([AuthRateThrottle])
+def token_refresh_view(request: Request) -> Response:
+    """Refresh an access token using a refresh token.
+
+    Uses SimpleJWT's built-in rotation and blacklisting.
+    """
+    serializer = RefreshRequestSerializer(data=request.data)
+    serializer.is_valid(raise_exception=True)
+
+    refresh_token_str: str = serializer.validated_data["refresh"]
+    try:
+        refresh = RefreshToken(refresh_token_str)
+        access = str(refresh.access_token)
+        new_refresh = str(refresh)
+    except TokenError as e:
+        return Response(
+            {"error": str(e), "code": "token_invalid"},
+            status=status.HTTP_401_UNAUTHORIZED,
+        )
+
+    return Response(
+        {"access": access, "refresh": new_refresh},
+        status=status.HTTP_200_OK,
+    )
+
+
+@api_view(["POST"])
+@permission_classes([AllowAny])
+def logout_view(request: Request) -> Response:
+    """Blacklist a refresh token (log out).
+
+    This allows explicit token revocation on logout.
+    """
+    serializer = LogoutSerializer(data=request.data)
+    serializer.is_valid(raise_exception=True)
+
+    refresh_token_str: str = serializer.validated_data["refresh"]
+    try:
+        refresh = RefreshToken(refresh_token_str)
+        refresh.blacklist()
+    except TokenError:
+        # If token is already invalid/blacklisted, still consider logout successful
+        pass
+    except AttributeError:
+        # If blacklist app not installed
+        pass
+
+    return Response(
+        {"message": "Successfully logged out."},
+        status=status.HTTP_205_RESET_CONTENT,
+    )
+
+
+@api_view(["GET"])
+def me_view(request: Request) -> Response:
+    """Return the current authenticated user's profile."""
+    return Response(
+        UserSerializer(request.user).data,
+        status=status.HTTP_200_OK,
     )