"""Provides utilities for working with image files."""
import imghdr
import logging
from typing import (
List,
Optional,
)
try:
from PIL import Image
except ImportError:
Image = None # type: ignore[assignment]
log = logging.getLogger(__name__)
[docs]def image_type(filename: str) -> Optional[str]:
fmt = None
if Image is not None:
try:
with Image.open(filename) as im:
fmt = im.format
except Exception:
# We continue to try with imghdr, so this is a rare case of an
# exception we expect to happen frequently, so we're not logging
pass
if not fmt:
fmt = imghdr.what(filename)
if fmt:
return fmt.upper()
else:
return None
[docs]def check_image_type(filename: str, types: List[str]) -> bool:
fmt = image_type(filename)
if fmt in types:
return True
return False