F(backend): add public media derivatives pipeline

apps/events/api/schemas.py

@@ -10,6 +10,7 @@ from apps.blog.api.schemas import AuthorSchema
 from apps.events.models import Event, Registration
 from apps.gallery.models import Gallery
 from apps.payments.models import Payment
+from core.media import BLUR_VARIANT, PREVIEW_VARIANT, THUMBNAIL_VARIANT, derivative_url
 
 
 class EventGallerySchema(ModelSchema):
@@ -18,6 +19,8 @@ class EventGallerySchema(ModelSchema):
     file_size_mb: float
     markdown_url: str
     absolute_image_url: Optional[str] = None
+    absolute_image_preview_url: Optional[str] = None
+    absolute_image_blur_url: Optional[str] = None
 
     class Config:
         model = Gallery
@@ -31,12 +34,26 @@ class EventGallerySchema(ModelSchema):
             return request.build_absolute_uri(obj.image.url)
         return None
 
+    @staticmethod
+    def resolve_absolute_image_preview_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.image, PREVIEW_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
+    @staticmethod
+    def resolve_absolute_image_blur_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.image, BLUR_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
 class EventSchema(ModelSchema):
     """Schema providing full event details for API responses."""
     gallery_images: List[EventGallerySchema]
     description_html: str
     registration_count: int
     absolute_featured_image_url: Optional[str] = None
+    absolute_featured_image_thumbnail_url: Optional[str] = None
+    absolute_featured_image_preview_url: Optional[str] = None
 
     class Config:
         model = Event
@@ -54,6 +71,18 @@ class EventSchema(ModelSchema):
             return request.build_absolute_uri(obj.featured_image.url)
         return None
 
+    @staticmethod
+    def resolve_absolute_featured_image_thumbnail_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.featured_image, THUMBNAIL_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
+    @staticmethod
+    def resolve_absolute_featured_image_preview_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.featured_image, PREVIEW_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
     @staticmethod
     def resolve_registration_count(obj):
         return obj.registrations.filter(status__in=[Registration.StatusChoices.CONFIRMED, Registration.StatusChoices.ATTENDED]).count()
@@ -70,6 +99,8 @@ class EventListSchema(Schema):
     slug: str
     featured_image: Optional[str] = None
     absolute_featured_image_url: Optional[str] = None
+    absolute_featured_image_thumbnail_url: Optional[str] = None
+    absolute_featured_image_preview_url: Optional[str] = None
     event_type: str
     start_time: datetime
     end_time: datetime
@@ -88,6 +119,18 @@ class EventListSchema(Schema):
             return request.build_absolute_uri(obj.featured_image.url)
         return None
 
+    @staticmethod
+    def resolve_absolute_featured_image_thumbnail_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.featured_image, THUMBNAIL_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
+    @staticmethod
+    def resolve_absolute_featured_image_preview_url(obj, context):
+        request = context["request"]
+        url = derivative_url(obj.featured_image, PREVIEW_VARIANT)
+        return request.build_absolute_uri(url) if url else None
+
     @staticmethod
     def resolve_registration_count(obj):
         return obj.registrations.filter(status__in=[Registration.StatusChoices.CONFIRMED, Registration.StatusChoices.ATTENDED]).count()