backend: convert input images to webp

backend/utils.py

@@ -0,0 +1,25 @@
+from PIL import Image, UnidentifiedImageError
+from pathlib import Path
+import io
+
+def asset(path: str) -> Path:
+    return Path("store", path)
+
+
+def image_normalize(img: bytes) -> bytes:
+    try:
+        byte_arr = io.BytesIO()
+        img = Image.open(io.BytesIO(img))
+        img.save(byte_arr, format='WEBP')
+        return byte_arr.getvalue()
+    except UnidentifiedImageError:
+        return 0
+
+def save_image(img: bytes, dir: str, name: str) -> int:
+    path = asset(dir)
+    path.mkdir(exist_ok=True)
+    img = image_normalize(img)
+    if img:
+        with open(Path(path, name+'.webp'), "wb") as file:
+            file.write(img)
+    return len(img)