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()

apps/events/models.py

@@ -10,6 +10,11 @@ import uuid
 import markdown
 from location_field.models.plain import PlainLocationField as LocationField
 
+from core.media import (
+    delete_image_derivatives_by_name,
+    get_image_previous_name,
+    safe_process_public_image,
+)
 from core.models import BaseModel
 
 
@@ -68,10 +73,24 @@ class Event(BaseModel):
         return self.title
 
     def save(self, *args, **kwargs):
+        previous_image_name = get_image_previous_name(self, "featured_image")
+        current_image_name = self.featured_image.name if self.featured_image else None
+
         if not self.slug:
             self.slug = slugify(self.title)
         super().save(*args, **kwargs)
 
+        if previous_image_name != current_image_name and previous_image_name:
+            delete_image_derivatives_by_name(
+                self.featured_image.storage if self.featured_image else None,
+                previous_image_name,
+                "event_featured",
+                delete_original=True,
+            )
+
+        if previous_image_name != current_image_name and self.featured_image:
+            safe_process_public_image(self.featured_image, "event_featured")
+
     @property
     def description_html(self):
         """Convert markdown description to HTML"""