def to_native(self, value):
if hasattr(value, 'url') is True:
#
# Validate its of the right type
#
self.validate_filename(value=value.name)
#
# Just download the object, the rest gets handled naturally
#
if urlparse(value.url).scheme: # check where delaing with an actual url here
_download_file(url=value.url, filename=value.name, obj=value.instance,
obj_fieldname=self.file_field_name)
return getattr(value, 'url', super(FileFieldAsUrlField, self).to_native(value=value))
def field_to_native(self, obj, field_name):
if obj is not None:
field = getattr(obj, field_name, None)
try:
if field.name in [None, '']:
raise FileHasNoNameException('File has no name')
#
# Start download if the file does not exist
#
# important as we then access the "name" attribute in teh serializer
# that allows us to name the file (as filepicker sends the name and url seperately)
request = self.context.get('request', {})
url = request.DATA.get(self.file_field_name)
original_filename = _valid_filename_length(request.DATA.get('name'), whitelist=self.ext_whitelist)
if original_filename is None:
#
# the name was not set; therefore extract it from executed_file which shoudl be a url at this point
#
try:
url_path = urlparse(request.DATA.get(self.file_field_name))
except:
# sometimes, yknow its not a url
url_path = request.DATA.get(self.file_field_name)
original_filename = os.path.basename(url_path.path)
#
# NB! we pass this into download which then brings the filedown and names it in the precribed
# upload_to manner
#
file_name, file_object = _download_file(url=url, filename=original_filename, obj=obj,
obj_fieldname=field_name)
field = getattr(obj, field_name)
# NB! we reuse the original_filename!
# this is to prevent filenames that repeat the original name twice
field.save(original_filename, file_object)
# update the object
obj.save(update_fields=[field_name])
return super(HyperlinkedAutoDownloadFileField, self).field_to_native(obj, field_name)
except Exception as e:
logger.debug('File serialized without a value: %s' % e)
#
# NB this must return None!
# else it will raise attribute has no file associated with it
# errors
#
return None
