def get_valid_file_extension(request, mimetype):
"""
Helper function to return the predefined file extension for a mimetype.
Also used to check valid file types (return None if not supported)
"""
vme = valid_mime_extensions(request)
try:
return vme[mimetype]
except KeyError:
return None
def getFileUploadValidExtensions(request):
"""
Return an ordered list of valid file extensions for uploads as defined in
the ini configuration of the application.
"""
extensions = []
validExtensions = valid_mime_extensions(request)
for currentExtension in validExtensions:
for knownExtension in mimetypes.guess_all_extensions(currentExtension):
# Add each extension only once
if knownExtension not in extensions:
extensions.append(knownExtension)
return sorted(extensions)