feat: Implement image thumbnail generation, storage, and API endpoints for assets, including a regeneration utility.

api/endpoints/assets_router.py

@@ -21,17 +21,31 @@ router = APIRouter(prefix="/api/assets", tags=["Assets"])
 
 
 @router.get("/{asset_id}")
-async def get_asset(asset_id: str, request: Request,dao: DAO = Depends(get_dao),) -> Response:
-    logger.debug(f"get_asset called for ID: {asset_id}")
+async def get_asset(
+    asset_id: str, 
+    request: Request,
+    thumbnail: bool = False,
+    dao: DAO = Depends(get_dao)
+) -> Response:
+    logger.debug(f"get_asset called for ID: {asset_id}, thumbnail={thumbnail}")
     asset = await dao.assets.get_asset(asset_id)
     # 2. Проверка на существование
     if not asset:
         raise HTTPException(status_code=404, detail="Asset not found")
+    
     headers = {
         # Кэшировать на 1 год (31536000 сек)
         "Cache-Control": "public, max-age=31536000, immutable"
     }
-    return Response(content=asset.data, media_type="image/png", headers=headers)
+    
+    content = asset.data
+    media_type = "image/png" # Default, or detect
+    
+    if thumbnail and asset.thumbnail:
+        content = asset.thumbnail
+        media_type = "image/jpeg"
+        
+    return Response(content=content, media_type=media_type, headers=headers)
 
 
 @router.get("")
@@ -41,7 +55,13 @@ async def get_assets(request: Request, dao: DAO = Depends(get_dao), limit: int =
     # assets = await dao.assets.get_assets() # This line seemed redundant/conflicting in original code
     total_count = await dao.assets.get_asset_count()
 
-    return AssetsResponse(assets=assets, total_count=total_count)
+    # Manually map to DTO to trigger computed fields validation if necessary, 
+    # but primarily to ensure valid Pydantic models for the response list.
+    # Asset.model_dump() generally includes computed fields (url) if configured.
+    # Let's ensure strict conversion.
+    asset_responses = [AssetResponse.model_validate(a.model_dump()) for a in assets]
+    
+    return AssetsResponse(assets=asset_responses, total_count=total_count)
 
 
 
@@ -62,11 +82,16 @@ async def upload_asset(
     if not data:
         raise HTTPException(status_code=400, detail="Empty file")
 
+    # Generate thumbnail
+    from utils.image_utils import create_thumbnail
+    thumbnail_bytes = await asyncio.to_thread(create_thumbnail, data)
+
     asset = Asset(
         name=file.filename or "upload",
         type=AssetType.IMAGE,
         linked_char_id=linked_char_id,
         data=data,
+        thumbnail=thumbnail_bytes
     )
 
     asset_id = await dao.assets.create_asset(asset)
@@ -79,4 +104,39 @@ async def upload_asset(
         type=asset.type.value if hasattr(asset.type, "value") else asset.type,
         linked_char_id=asset.linked_char_id,
         created_at=asset.created_at,
-    )
+        url=asset.url
+    )
+
+
+@router.post("/regenerate_thumbnails")
+async def regenerate_thumbnails(dao: DAO = Depends(get_dao)):
+    """
+    Regenerates thumbnails for all existing image assets that don't have one.
+    """
+    logger.info("Starting thumbnail regeneration task")
+    from utils.image_utils import create_thumbnail
+    import asyncio
+
+    # Get all assets (pagination loop might be needed for huge datasets, but simple list for now)
+    # We'll rely on DAO providing a method or just fetch large chunk.
+    # Assuming get_assets might have limit, let's fetch in chunks or just all if possible within limit.
+    # Ideally should use a specific repo method for iteration.
+    # For now, let's fetch first 1000 or similar.
+    assets = await dao.assets.get_assets(limit=1000, offset=0, with_data=True) 
+    logger.info(f"Found {len(assets)} assets")
+    count = 0
+    updated = 0
+    
+    for asset in assets:
+        if asset.type == AssetType.IMAGE and asset.data :
+            try:
+                thumb = await asyncio.to_thread(create_thumbnail, asset.data)
+                if thumb:
+                    asset.thumbnail = thumb
+                    await dao.assets.update_asset(asset.id, asset)
+                    updated += 1
+            except Exception as e:
+                logger.error(f"Failed to regenerate thumbnail for asset {asset.id}: {e}")
+        count += 1
+        
+    return {"status": "completed", "processed": count, "updated": updated}