Fix favicon loading

src/pretix/_base_settings.py

@@ -267,9 +267,10 @@ CACHE_LARGE_VALUES_ALIAS = 'default'
 FILE_UPLOAD_EXTENSIONS_IMAGE = (".png", ".jpg", ".gif", ".jpeg")
 PILLOW_FORMATS_IMAGE = ('PNG', 'GIF', 'JPEG')
 
-FILE_UPLOAD_EXTENSIONS_FAVICON = (".ico", ".png", "jpg", ".gif", ".jpeg")
+FILE_UPLOAD_EXTENSIONS_FAVICON = (".ico", ".png", ".jpg", ".gif", ".jpeg")
+PILLOW_FORMATS_QUESTIONS_FAVICON = ('PNG', 'GIF', 'JPEG', 'ICO')
 
-FILE_UPLOAD_EXTENSIONS_QUESTION_IMAGE = (".png", "jpg", ".gif", ".jpeg", ".bmp", ".tif", ".tiff", ".jfif")
+FILE_UPLOAD_EXTENSIONS_QUESTION_IMAGE = (".png", ".jpg", ".gif", ".jpeg", ".bmp", ".tif", ".tiff", ".jfif")
 PILLOW_FORMATS_QUESTIONS_IMAGE = ('PNG', 'GIF', 'JPEG', 'BMP', 'TIFF')
 
 FILE_UPLOAD_EXTENSIONS_EMAIL_ATTACHMENT = (

src/pretix/base/settings.py

@@ -2910,6 +2910,25 @@ Your {organizer} team"""))  # noqa: W291
             label=_('Use header image also for events without an individually uploaded logo'),
         )
     },
+    'favicon': {
+        'default': None,
+        'type': File,
+        'form_class': ExtFileField,
+        'form_kwargs': dict(
+            label=_('Favicon'),
+            ext_whitelist=settings.FILE_UPLOAD_EXTENSIONS_FAVICON,
+            max_size=settings.FILE_UPLOAD_MAX_SIZE_FAVICON,
+            help_text=_('If you provide a favicon, we will show it instead of the default pretix icon. '
+                        'We recommend a size of at least 200x200px to accommodate most devices.')
+        ),
+        'serializer_class': UploadedFileField,
+        'serializer_kwargs': dict(
+            allowed_types=[
+                'image/png', 'image/jpeg', 'image/gif', 'image/x-icon', 'image/vnd.microsoft.icon',
+            ],
+            max_size=settings.FILE_UPLOAD_MAX_SIZE_FAVICON,
+        )
+    },
     'og_image': {
         'default': None,
         'type': File,

src/pretix/control/forms/organizer.py

@@ -423,6 +423,7 @@ class OrganizerSettingsForm(SettingsForm):
         'organizer_link_back',
         'organizer_logo_image_large',
         'organizer_logo_image_inherit',
+        'favicon',
         'giftcard_length',
         'giftcard_expiry_years',
         'locales',
@@ -464,14 +465,6 @@ class OrganizerSettingsForm(SettingsForm):
                     'can increase the size with the setting below. We recommend not using small details on the picture '
                     'as it will be resized on smaller screens.')
     )
-    favicon = ExtFileField(
-        label=_('Favicon'),
-        ext_whitelist=settings.FILE_UPLOAD_EXTENSIONS_FAVICON,
-        required=False,
-        max_size=settings.FILE_UPLOAD_MAX_SIZE_FAVICON,
-        help_text=_('If you provide a favicon, we will show it instead of the default pretix icon. '
-                    'We recommend a size of at least 200x200px to accommodate most devices.')
-    )
 
     def __init__(self, *args, **kwargs):
         is_admin = kwargs.pop('is_admin', False)

src/pretix/helpers/thumb.py

@@ -164,9 +164,9 @@ def resize_image(image, size):
     return image
 
 
-def create_thumbnail(sourcename, size):
+def create_thumbnail(sourcename, size, formats=None):
     source = default_storage.open(sourcename)
-    image = Image.open(BytesIO(source.read()), formats=settings.PILLOW_FORMATS_QUESTIONS_IMAGE)
+    image = Image.open(BytesIO(source.read()), formats=formats or settings.PILLOW_FORMATS_QUESTIONS_IMAGE)
     try:
         image.load()
     except:
@@ -208,9 +208,9 @@ def create_thumbnail(sourcename, size):
     return t
 
 
-def get_thumbnail(source, size):
+def get_thumbnail(source, size, formats=None):
     # Assumes files are immutable
     try:
         return Thumbnail.objects.get(source=source, size=size)
     except Thumbnail.DoesNotExist:
-        return create_thumbnail(source, size)
+        return create_thumbnail(source, size, formats=formats)

src/pretix/presale/views/organizer.py

@@ -1229,7 +1229,8 @@ class OrganizerIcalDownload(OrganizerViewMixin, View):
 
 class OrganizerFavicon(View):
     def get(self, *args, **kwargs):
-        if self.request.organizer.settings.favicon:
-            return redirect_to_url(get_thumbnail(self.request.organizer.settings.favicon, '32x32^').thumb.url)
+        icon_file = self.request.organizer.settings.get('favicon', as_type=str, default='')[7:]
+        if icon_file:
+            return redirect_to_url(get_thumbnail(icon_file, '32x32^', formats=settings.PILLOW_FORMATS_QUESTIONS_FAVICON).thumb.url)
         else:
             return redirect_to_url(static("pretixbase/img/favicon.ico"))