function bbp_moderator_assignment_metabox( $post ) {

	// Get nicenames
	$user_ids       = bbp_get_moderator_ids( $post->ID );
	$user_nicenames = bbp_get_user_nicenames_from_ids( $user_ids );
	$moderators     = ! empty( $user_nicenames )
		? implode( ', ', array_map( 'esc_attr', $user_nicenames ) )
		: ''; ?>

	<label class="screen-reader-text" for="bbp_moderators"><?php esc_html_e( 'Moderators', 'bbpress' ); ?></label>
	<input type="text" id="bbp_moderators" name="bbp_moderators" value="<?php echo esc_attr( $moderators ); ?>" />
	<p class="howto"><?php esc_html_e( 'Separate user-names with commas', 'bbpress' ); ?></p>

	<?php

	do_action( 'bbp_moderator_assignment_metabox', $post );
}