def from_dict(cls, data, bucket):
"""Construct a file wrapper from a dictionary."""
file_args = dict(
id=data['file_id'],
storage_class=data.get('storage_class'),
size=data.get('size'),
checksum=data.get('checksum'),
)
if 'uri' in data:
file_args['uri'] = data['uri']
fi = FileInstance(**file_args)
obj = ObjectVersion(
version_id=data['version_id'],
key=data['key'],
file_id=data['file_id'],
_mimetype=data['mimetype'],
is_head=True,
bucket=bucket,
bucket_id=data.get('bucket_id', bucket.id),
)
return cls(object_model=obj, file_model=fi)
