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