466 lines
12 KiB
PHP
466 lines
12 KiB
PHP
<?php
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namespace Activitypub;
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use Activitypub\Collection\Users;
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use WP_Comment_Query;
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use function Activitypub\is_user_disabled;
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use function Activitypub\is_single_user;
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/**
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* ActivityPub Comment Class
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*
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* This class is a helper/utils class that provides a collection of static
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* methods that are used to handle comments.
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*/
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class Comment {
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/**
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* Initialize the class, registering WordPress hooks
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*/
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public static function init() {
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\add_filter( 'comment_reply_link', array( self::class, 'comment_reply_link' ), 10, 3 );
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\add_filter( 'comment_class', array( self::class, 'comment_class' ), 10, 3 );
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\add_filter( 'get_comment_link', array( self::class, 'remote_comment_link' ), 11, 3 );
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\add_action( 'wp_enqueue_scripts', array( self::class, 'enqueue_scripts' ) );
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}
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/**
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* Filter the comment reply link.
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*
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* We don't want to show the comment reply link for federated comments
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* if the user is disabled for federation.
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*
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* @param string $link The HTML markup for the comment reply link.
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* @param array $args An array of arguments overriding the defaults.
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* @param WP_Comment $comment The object of the comment being replied.
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*
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* @return string The filtered HTML markup for the comment reply link.
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*/
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public static function comment_reply_link( $link, $args, $comment ) {
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if ( self::are_comments_allowed( $comment ) ) {
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$user_id = get_current_user_id();
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if ( $user_id && self::was_received( $comment ) && \user_can( $user_id, 'activitypub' ) ) {
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return self::create_fediverse_reply_link( $link, $args );
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}
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return $link;
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}
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$attrs = array(
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'selectedComment' => self::generate_id( $comment ),
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'commentId' => $comment->comment_ID,
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);
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$div = sprintf(
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'<div class="activitypub-remote-reply" data-attrs="%s"></div>',
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esc_attr( wp_json_encode( $attrs ) )
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);
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return apply_filters( 'activitypub_comment_reply_link', $div );
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}
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/**
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* Create a link to reply to a federated comment.
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* This function adds a title attribute to the reply link to inform the user
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* that the comment was received from the fediverse and the reply will be sent
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* to the original author.
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*
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* @param string $link The HTML markup for the comment reply link.
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* @param array $args The args provided by the `comment_reply_link` filter.
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*
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* @return string The modified HTML markup for the comment reply link.
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*/
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private static function create_fediverse_reply_link( $link, $args ) {
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$str_to_replace = sprintf( '>%s<', $args['reply_text'] );
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$replace_with = sprintf(
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' title="%s">%s<',
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esc_attr__( 'This comment was received from the fediverse and your reply will be sent to the original author', 'activitypub' ),
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esc_html__( 'Reply with federation', 'activitypub' )
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);
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return str_replace( $str_to_replace, $replace_with, $link );
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}
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/**
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* Check if it is allowed to comment to a comment.
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*
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* Checks if the comment is local only or if the user can comment federated comments.
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*
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* @param mixed $comment Comment object or ID.
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*
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* @return boolean True if the user can comment, false otherwise.
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*/
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public static function are_comments_allowed( $comment ) {
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$comment = \get_comment( $comment );
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if ( ! self::was_received( $comment ) ) {
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return true;
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}
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$current_user = get_current_user_id();
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if ( ! $current_user ) {
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return false;
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}
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if ( is_single_user() && \user_can( $current_user, 'publish_posts' ) ) {
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// On a single user site, comments by users with the `publish_posts` capability will be federated as the blog user
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$current_user = Users::BLOG_USER_ID;
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}
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$is_user_disabled = is_user_disabled( $current_user );
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if ( $is_user_disabled ) {
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return false;
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}
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return true;
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}
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/**
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* Check if a comment is federated.
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*
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* We consider a comment federated if comment was received via ActivityPub.
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*
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* Use this function to check if it is comment that was received via ActivityPub.
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*
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* @param mixed $comment Comment object or ID.
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*
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* @return boolean True if the comment is federated, false otherwise.
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*/
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public static function was_received( $comment ) {
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$comment = \get_comment( $comment );
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if ( ! $comment ) {
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return false;
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}
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$protocol = \get_comment_meta( $comment->comment_ID, 'protocol', true );
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if ( 'activitypub' === $protocol ) {
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return true;
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}
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return false;
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}
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/**
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* Check if a comment was federated.
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*
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* This function checks if a comment was federated via ActivityPub.
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*
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* @param mixed $comment Comment object or ID.
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*
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* @return boolean True if the comment was federated, false otherwise.
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*/
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public static function was_sent( $comment ) {
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$comment = \get_comment( $comment );
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if ( ! $comment ) {
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return false;
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}
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$status = \get_comment_meta( $comment->comment_ID, 'activitypub_status', true );
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if ( $status ) {
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return true;
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}
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return false;
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}
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/**
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* Check if a comment is local only.
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*
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* This function checks if a comment is local only and was not sent or received via ActivityPub.
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*
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* @param mixed $comment Comment object or ID.
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*
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* @return boolean True if the comment is local only, false otherwise.
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*/
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public static function is_local( $comment ) {
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if ( self::was_sent( $comment ) || self::was_received( $comment ) ) {
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return false;
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}
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return true;
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}
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/**
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* Check if a comment should be federated.
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*
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* We consider a comment should be federated if it is authored by a user that is
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* not disabled for federation and if it is a reply directly to the post or to a
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* federated comment.
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*
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* Use this function to check if a comment should be federated.
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*
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* @param mixed $comment Comment object or ID.
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*
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* @return boolean True if the comment should be federated, false otherwise.
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*/
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public static function should_be_federated( $comment ) {
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// we should not federate federated comments
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if ( self::was_received( $comment ) ) {
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return false;
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}
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$comment = \get_comment( $comment );
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$user_id = $comment->user_id;
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// comments without user can't be federated
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if ( ! $user_id ) {
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return false;
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}
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if ( is_single_user() && \user_can( $user_id, 'publish_posts' ) ) {
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// On a single user site, comments by users with the `publish_posts` capability will be federated as the blog user
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$user_id = Users::BLOG_USER_ID;
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}
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$is_user_disabled = is_user_disabled( $user_id );
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// user is disabled for federation
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if ( $is_user_disabled ) {
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return false;
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}
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// it is a comment to the post and can be federated
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if ( empty( $comment->comment_parent ) ) {
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return true;
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}
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// check if parent comment is federated
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$parent_comment = \get_comment( $comment->comment_parent );
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return ! self::is_local( $parent_comment );
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}
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/**
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* Examine a comment ID and look up an existing comment it represents.
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*
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* @param string $id ActivityPub object ID (usually a URL) to check.
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*
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* @return int|boolean Comment ID, or false on failure.
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*/
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public static function object_id_to_comment( $id ) {
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$comment_query = new WP_Comment_Query(
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array(
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'meta_key' => 'source_id', // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
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'meta_value' => $id, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
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)
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);
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if ( ! $comment_query->comments ) {
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return false;
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}
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if ( count( $comment_query->comments ) > 1 ) {
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return false;
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}
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return $comment_query->comments[0];
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}
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/**
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* Verify if URL is a local comment, or if it is a previously received
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* remote comment (For threading comments locally)
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*
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* @param string $url The URL to check.
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*
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* @return int comment_ID or null if not found
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*/
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public static function url_to_commentid( $url ) {
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if ( ! $url || ! filter_var( $url, \FILTER_VALIDATE_URL ) ) {
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return null;
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}
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// check for local comment
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if ( \wp_parse_url( \home_url(), \PHP_URL_HOST ) === \wp_parse_url( $url, \PHP_URL_HOST ) ) {
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$query = \wp_parse_url( $url, \PHP_URL_QUERY );
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if ( $query ) {
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parse_str( $query, $params );
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if ( ! empty( $params['c'] ) ) {
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$comment = \get_comment( $params['c'] );
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if ( $comment ) {
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return $comment->comment_ID;
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}
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}
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}
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}
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$args = array(
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// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
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'meta_query' => array(
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'relation' => 'OR',
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array(
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'key' => 'source_url',
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'value' => $url,
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),
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array(
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'key' => 'source_id',
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'value' => $url,
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),
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),
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);
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$query = new WP_Comment_Query();
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$comments = $query->query( $args );
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if ( $comments && is_array( $comments ) ) {
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return $comments[0]->comment_ID;
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}
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return null;
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}
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/**
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* Filters the CSS classes to add an ActivityPub class.
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*
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* @param string[] $classes An array of comment classes.
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* @param string[] $css_class An array of additional classes added to the list.
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* @param string $comment_id The comment ID as a numeric string.
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*
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* @return string[] An array of classes.
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*/
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public static function comment_class( $classes, $css_class, $comment_id ) {
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// check if ActivityPub comment
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if ( 'activitypub' === get_comment_meta( $comment_id, 'protocol', true ) ) {
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$classes[] = 'activitypub-comment';
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}
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return $classes;
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}
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/**
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* Link remote comments to source url.
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*
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* @param string $comment_link
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* @param object|WP_Comment $comment
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*
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* @return string $url
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*/
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public static function remote_comment_link( $comment_link, $comment ) {
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if ( ! $comment || is_admin() ) {
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return $comment_link;
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}
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$comment_meta = \get_comment_meta( $comment->comment_ID );
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if ( ! empty( $comment_meta['source_url'][0] ) ) {
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return $comment_meta['source_url'][0];
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} elseif ( ! empty( $comment_meta['source_id'][0] ) ) {
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return $comment_meta['source_id'][0];
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}
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return $comment_link;
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}
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/**
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* Generates an ActivityPub URI for a comment
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*
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* @param WP_Comment|int $comment A comment object or comment ID
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*
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* @return string ActivityPub URI for comment
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*/
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public static function generate_id( $comment ) {
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$comment = \get_comment( $comment );
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$comment_meta = \get_comment_meta( $comment->comment_ID );
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// show external comment ID if it exists
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if ( ! empty( $comment_meta['source_id'][0] ) ) {
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return $comment_meta['source_id'][0];
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} elseif ( ! empty( $comment_meta['source_url'][0] ) ) {
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return $comment_meta['source_url'][0];
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}
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// generate URI based on comment ID
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return \add_query_arg( 'c', $comment->comment_ID, \trailingslashit( \home_url() ) );
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}
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/**
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* Check if a post has remote comments
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*
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* @param int $post_id The post ID.
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*
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* @return bool True if the post has remote comments, false otherwise.
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*/
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private static function post_has_remote_comments( $post_id ) {
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$comments = \get_comments(
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array(
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'post_id' => $post_id,
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'meta_query' => array(
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'relation' => 'AND',
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array(
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'key' => 'protocol',
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'value' => 'activitypub',
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'compare' => '=',
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),
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array(
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'key' => 'source_id',
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'compare' => 'EXISTS',
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),
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),
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)
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);
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return ! empty( $comments );
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}
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/**
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* Enqueue scripts for remote comments
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*/
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public static function enqueue_scripts() {
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if ( ! \is_singular() || \is_user_logged_in() ) {
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// only on single pages, only for logged out users
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return;
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}
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if ( ! \post_type_supports( \get_post_type(), 'activitypub' ) ) {
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// post type does not support ActivityPub
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return;
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}
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if ( ! \comments_open() || ! \get_comments_number() ) {
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// no comments, no need to load the script
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return;
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}
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if ( ! self::post_has_remote_comments( \get_the_ID() ) ) {
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// no remote comments, no need to load the script
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return;
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}
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$handle = 'activitypub-remote-reply';
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$data = array(
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'namespace' => ACTIVITYPUB_REST_NAMESPACE,
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);
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$js = sprintf( 'var _activityPubOptions = %s;', wp_json_encode( $data ) );
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$asset_file = ACTIVITYPUB_PLUGIN_DIR . 'build/remote-reply/index.asset.php';
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if ( \file_exists( $asset_file ) ) {
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$assets = require_once $asset_file;
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\wp_enqueue_script(
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$handle,
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\plugins_url( 'build/remote-reply/index.js', __DIR__ ),
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$assets['dependencies'],
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$assets['version'],
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true
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);
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\wp_add_inline_script( $handle, $js, 'before' );
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\wp_enqueue_style(
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$handle,
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\plugins_url( 'build/remote-reply/style-index.css', __DIR__ ),
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[ 'wp-components' ],
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$assets['version']
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);
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}
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}
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}
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