Bump importlib_metadata to 7

when re-submitting a form a second time, the cached file got lost

pyproject.toml

@@ -59,7 +59,7 @@ dependencies = [
   "dnspython==2.3.*",
   "drf_ujson2==1.7.*",
   "geoip2==4.*",
-  "importlib_metadata==6.*",  # Polyfill, we can probably drop this once we require Python 3.10+
+  "importlib_metadata==7.*",  # Polyfill, we can probably drop this once we require Python 3.10+
   "isoweek",
   "jsonschema",
   "kombu==5.3.*",

src/pretix/__init__.py

@@ -19,4 +19,4 @@
 # You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
 # <https://www.gnu.org/licenses/>.
 #
-__version__ = "2023.8.0"
+__version__ = "2023.8.1"

src/pretix/control/forms/__init__.py

@@ -219,15 +219,17 @@ class ExtValidationMixin:
 
     def clean(self, *args, **kwargs):
         data = super().clean(*args, **kwargs)
-        if isinstance(data, UploadedFile):
-            filename = data.name
+
+        from ...base.models import CachedFile
+        if isinstance(data, (UploadedFile, CachedFile)):
+            filename = data.name if isinstance(data, UploadedFile) else data.filename
             ext = os.path.splitext(filename)[1]
             ext = ext.lower()
             if ext not in self.ext_whitelist:
                 raise forms.ValidationError(_("Filetype not allowed!"))
 
             if ext in IMAGE_EXTS:
-                validate_uploaded_file_for_valid_image(data)
+                validate_uploaded_file_for_valid_image(data if isinstance(data, UploadedFile) else data.file)
 
         return data
 
@@ -257,6 +259,12 @@ class CachedFileField(ExtFileField):
         if isinstance(data, File):
             if hasattr(data, '_uploaded_to'):
                 return data._uploaded_to
+
+            try:
+                self.clean(data)
+            except ValidationError:
+                return None
+
             cf = CachedFile.objects.create(
                 expires=now() + datetime.timedelta(days=1),
                 date=now(),
@@ -268,6 +276,9 @@ class CachedFileField(ExtFileField):
             cf.save()
             data._uploaded_to = cf
             return cf
+        if isinstance(data, CachedFile):
+            return data
+
         return super().bound_data(data, initial)
 
     def clean(self, *args, **kwargs):

src/pretix/helpers/images.py

@@ -44,11 +44,12 @@ def validate_uploaded_file_for_valid_image(f):
     # have to read the data into memory.
     if hasattr(f, 'temporary_file_path'):
         file = f.temporary_file_path()
+    elif hasattr(f, 'read'):
+        if hasattr(f, 'seek') and callable(f.seek):
+            f.seek(0)
+        file = BytesIO(f.read())
     else:
-        if hasattr(f, 'read'):
-            file = BytesIO(f.read())
-        else:
-            file = BytesIO(f['content'])
+        file = BytesIO(f['content'])
 
     try:
         try: