BBP_Forums_Group_Extension::redirect_canonical()

	public function redirect_canonical() {

		// Viewing a single forum
		if ( bbp_is_single_forum() ) {
			$forum_id  = get_the_ID();
			$group_ids = bbp_get_forum_group_ids( $forum_id );

		// Viewing a single topic
		} elseif ( bbp_is_single_topic() ) {
			$topic_id  = get_the_ID();
			$slug      = get_post_field( 'post_name', $topic_id );
			$forum_id  = bbp_get_topic_forum_id( $topic_id );
			$group_ids = bbp_get_forum_group_ids( $forum_id );

		// Not a forum or topic
		} else {
			return;
		}

		// Bail if not a group forum
		if ( empty( $group_ids ) )
			return;

		// Use the first group ID
		$group_id 	 = $group_ids[0];
		$group    	 = groups_get_group( array( 'group_id' => $group_id ) );
		$group_link  = trailingslashit( bp_get_group_permalink( $group ) );
		$redirect_to = trailingslashit( $group_link . $this->slug );

		// Add topic slug to URL
		if ( bbp_is_single_topic() ) {
			$redirect_to  = trailingslashit( $redirect_to . $this->topic_slug . '/' . $slug );
		}

		bp_core_redirect( $redirect_to );
	}