F(backend): add public media derivatives pipeline

apps/users/api/schemas.py

@@ -3,6 +3,7 @@
 from ninja import Schema, ModelSchema
 from typing import Optional
 
+from core.media import PREVIEW_VARIANT, THUMBNAIL_VARIANT, derivative_url
 from apps.users.models import User
 
 
@@ -23,6 +24,8 @@ class UserLoginSchema(Schema):
 
 class UserProfileSchema(ModelSchema):
     profile_picture: Optional[str] = None
+    profile_picture_thumbnail_url: Optional[str] = None
+    profile_picture_preview_url: Optional[str] = None
     student_id: Optional[str] = None
     major: Optional[str] = None
     university: Optional[str] = None
@@ -68,6 +71,18 @@ class UserProfileSchema(ModelSchema):
             return request.build_absolute_uri(obj.profile_picture.url)
         return None
 
+    @staticmethod
+    def resolve_profile_picture_thumbnail_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.profile_picture, THUMBNAIL_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
+    @staticmethod
+    def resolve_profile_picture_preview_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.profile_picture, PREVIEW_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
 
 class UserListSchema(ModelSchema):
     major: Optional[str] = None

apps/users/api/views.py

@@ -5,13 +5,13 @@ from django.contrib.auth import authenticate
 from django.db.models import Q
 from django.shortcuts import get_object_or_404
 from django.utils import timezone
-from django.core.files.storage import default_storage
 from django.core.files.base import ContentFile
 
 import uuid
 import jwt
 from ninja import Query, Router
 
+from core.media import delete_image_derivatives
 from apps.users.models import User, Major, University
 from apps.users.tasks import send_verification_email, send_password_reset_email
 from apps.users.api.schemas import (
@@ -254,10 +254,6 @@ def upload_profile_picture(request):
     
     user = request.auth
     
-    # Delete old profile picture if exists
-    if user.profile_picture:
-        default_storage.delete(user.profile_picture.name)
-    
     # Save new profile picture
     filename = f"profile_pictures/{user.id}_{uuid.uuid4().hex}.{file.name.split('.')[-1]}"
     user.profile_picture.save(filename, ContentFile(file.read()))
@@ -270,7 +266,7 @@ def delete_profile_picture(request):
     user = request.auth
     
     if user.profile_picture:
-        default_storage.delete(user.profile_picture.name)
+        delete_image_derivatives(user.profile_picture, "profile_picture", delete_original=True)
         user.profile_picture = None
         user.save(update_fields=['profile_picture'])
     
@@ -400,4 +396,3 @@ def check_username_availability(request, username: str):
     """Check if a username is available for registration"""
     exists = User.objects.filter(username=username).exists()
     return {"exists": exists}
-