def get_item_metadata(self, handle):
        """Return dictionary containing all metadata associated with handle.

        In other words all the metadata added using the ``add_item_metadata``
        method.

        :param handle: handle for accessing an item before the dataset is
                       frozen
        :returns: dictionary containing item metadata
        """

        bucket = self.s3resource.Bucket(self.bucket)

        metadata = {}

        identifier = generate_identifier(handle)
        prefix = self.fragments_key_prefix + '{}'.format(identifier)
        for obj in bucket.objects.filter(Prefix=prefix).all():
            metadata_key = obj.key.split('.')[-2]
            response = obj.get()
            value_as_string = response['Body'].read().decode('utf-8')
            value = json.loads(value_as_string)

            metadata[metadata_key] = value

        return metadata
Return dictionary containing all metadata associated with handle.

        In other words all the metadata added using the ``add_item_metadata``
        method.

        :param handle: handle for accessing an item before the dataset is
                       frozen
        :returns: dictionary containing item metadata