Create image_utils.py

image_utils.py

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+import base64
+import io
+import logging
+from typing import Optional, Tuple
+
+from PIL import Image, ImageOps
+
+logger = logging.getLogger(__name__)
+
+MAX_SIDE = 768            # sisi terpanjang setelah resize
+JPEG_QUALITIES = (72, 60, 50)
+MAX_OUTPUT_BYTES = 200_000
+MAX_PIXELS = 40_000_000   # tolak gambar raksasa (decompression bomb)
+Image.MAX_IMAGE_PIXELS = MAX_PIXELS
+
+
+def compress_image_to_data_url(path: Optional[str]) -> Tuple[Optional[str], str]:
+    """Return (data_url, error). Semua di memori; tidak ada file baru ditulis."""
+    if not path:
+        return None, ""
+    try:
+        with Image.open(path) as src:
+            if src.width * src.height > MAX_PIXELS:
+                return None, "Resolusi foto terlalu besar."
+            src.draft("RGB", (MAX_SIDE * 2, MAX_SIDE * 2))  # percepat decode JPEG
+            img = ImageOps.exif_transpose(src)               # perbaiki rotasi HP
+            img = img.convert("RGB")
+            img.thumbnail((MAX_SIDE, MAX_SIDE), Image.Resampling.LANCZOS)
+
+            data = b""
+            for q in JPEG_QUALITIES:
+                buf = io.BytesIO()
+                img.save(buf, "JPEG", quality=q, optimize=True)  # EXIF/GPS tidak ikut
+                data = buf.getvalue()
+                if len(data) <= MAX_OUTPUT_BYTES:
+                    break
+
+        b64 = base64.b64encode(data).decode("ascii")
+        return f"data:image/jpeg;base64,{b64}", ""
+    except Exception as e:
+        logger.warning(f"Image compress failed: {e}")
+        return None, "Foto tidak dapat diproses."