Accept HEIC image format labels

photo-upload/app.py

@@ -128,8 +128,10 @@ def public_text(text):
 
 def web_image(raw, destination):
     with Image.open(io.BytesIO(raw)) as original:
-        if original.format not in {"JPEG", "PNG", "WEBP", "HEIF", "AVIF", "TIFF"}:
-            raise ValueError("Use JPEG, PNG, WebP, HEIC, AVIF, or TIFF photos")
+        if original.format not in {"JPEG", "PNG", "WEBP", "HEIF", "HEIC", "AVIF", "TIFF"}:
+            raise ValueError(
+                f"Detected {original.format or 'unknown'}; use JPEG, PNG, WebP, "
+                "HEIF/HEIC, AVIF, or TIFF photos")
         taken_at = exif_photo_date(original.getexif())
         image = ImageOps.exif_transpose(original)
         image.thumbnail((GALLERY_MAX_EDGE, GALLERY_MAX_EDGE), Image.Resampling.LANCZOS)

photo-upload/tests/test_upload.py

@@ -171,6 +171,28 @@ def test_tiff_and_invalid_color_profile_are_accepted(service):
             assert image.format == "JPEG"
 
 
+def test_heic_format_label_is_accepted(service, monkeypatch):
+    _, client, _ = service
+    actual_open = Image.open
+
+    class HeicLabel:
+        def __init__(self, image):
+            self.image = image
+            self.format = "HEIC"
+
+        def __enter__(self):
+            return self
+
+        def __exit__(self, *args):
+            self.image.close()
+
+        def __getattr__(self, name):
+            return getattr(self.image, name)
+
+    monkeypatch.setattr(Image, "open", lambda source: HeicLabel(actual_open(source)))
+    assert upload(client, [photo()]).status_code == 202
+
+
 def test_photo_date_comes_from_original_metadata(service):
     _, client, data = service
     exif = Image.Exif()