wordpress-activitypub/includes/class-activitypub.php

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<?php
namespace Activitypub;
use Activitypub\Signature;
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/**
* ActivityPub Class
*
* @author Matthias Pfefferle
*/
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class Activitypub {
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/**
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* Initialize the class, registering WordPress hooks.
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*/
public static function init() {
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\add_filter( 'template_include', array( self::class, 'render_json_template' ), 99 );
\add_filter( 'query_vars', array( self::class, 'add_query_vars' ) );
\add_filter( 'pre_get_avatar_data', array( self::class, 'pre_get_avatar_data' ), 11, 2 );
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// Add support for ActivityPub to custom post types
$post_types = \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) ? \get_option( 'activitypub_support_post_types', array( 'post', 'page' ) ) : array();
foreach ( $post_types as $post_type ) {
\add_post_type_support( $post_type, 'activitypub' );
}
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\add_action( 'transition_post_status', array( self::class, 'schedule_post_activity' ), 33, 3 );
\add_action( 'wp_trash_post', array( self::class, 'trash_post' ), 1 );
\add_action( 'untrash_post', array( self::class, 'untrash_post' ), 1 );
}
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/**
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* Return a AS2 JSON version of an author, post or page.
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*
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* @param string $template The path to the template object.
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*
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* @return string The new path to the JSON template.
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*/
public static function render_json_template( $template ) {
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if ( ! \is_author() && ! \is_singular() && ! \is_home() ) {
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return $template;
}
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// Ensure that edge caches know that this page can deliver both HTML and JSON.
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header( 'Vary: Accept' );
// check if user can publish posts
if ( \is_author() && ! user_can( \get_the_author_meta( 'ID' ), 'publish_posts' ) ) {
return $template;
}
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if ( \is_author() ) {
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$json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/author-json.php';
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} elseif ( \is_singular() ) {
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$json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/post-json.php';
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} elseif ( \is_home() ) {
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$json_template = ACTIVITYPUB_PLUGIN_DIR . '/templates/blog-json.php';
}
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global $wp_query;
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if ( isset( $wp_query->query_vars['activitypub'] ) ) {
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return $json_template;
}
if ( ! isset( $_SERVER['HTTP_ACCEPT'] ) ) {
return $template;
}
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$accept_header = $_SERVER['HTTP_ACCEPT'];
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// Accept header as an array.
$accept = \explode( ',', \trim( $accept_header ) );
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if (
\stristr( $accept_header, 'application/activity+json' ) ||
\stristr( $accept_header, 'application/ld+json' ) ||
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\in_array( 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"', $accept, true ) ||
\in_array( 'application/activity+json', $accept, true ) ||
\in_array( 'application/ld+json', $accept, true ) ||
\in_array( 'application/json', $accept, true )
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) {
if ( \get_option( 'activitypub_use_secure_mode', '0' ) ) {
$verification = Signature::verify_http_signature( $_SERVER );
if ( \is_wp_error( $verification ) ) {
// fallback as template_loader can't return http headers
return $template;
}
}
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return $json_template;
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}
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return $template;
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}
/**
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* Add the 'activitypub' query variable so WordPress won't mangle it.
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*/
public static function add_query_vars( $vars ) {
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$vars[] = 'activitypub';
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return $vars;
}
/**
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* Schedule Activities.
*
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* @param string $new_status New post status.
* @param string $old_status Old post status.
* @param WP_Post $post Post object.
*/
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public static function schedule_post_activity( $new_status, $old_status, $post ) {
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// Do not send activities if post is password protected.
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if ( \post_password_required( $post ) ) {
return;
}
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// Check if post-type supports ActivityPub.
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$post_types = \get_post_types_by_support( 'activitypub' );
if ( ! \in_array( $post->post_type, $post_types, true ) ) {
return;
}
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$activitypub_post = new \Activitypub\Model\Post( $post );
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if ( 'publish' === $new_status && 'publish' !== $old_status ) {
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\wp_schedule_single_event( \time(), 'activitypub_send_create_activity', array( $activitypub_post ) );
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} elseif ( 'publish' === $new_status ) {
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\wp_schedule_single_event( \time(), 'activitypub_send_update_activity', array( $activitypub_post ) );
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} elseif ( 'trash' === $new_status ) {
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\wp_schedule_single_event( \time(), 'activitypub_send_delete_activity', array( $activitypub_post ) );
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}
}
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/**
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* Replaces the default avatar.
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*
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* @param array $args Arguments passed to get_avatar_data(), after processing.
* @param int|string|object $id_or_email A user ID, email address, or comment object.
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*
* @return array $args
*/
public static function pre_get_avatar_data( $args, $id_or_email ) {
if (
! $id_or_email instanceof \WP_Comment ||
! isset( $id_or_email->comment_type ) ||
$id_or_email->user_id
) {
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return $args;
}
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$allowed_comment_types = \apply_filters( 'get_avatar_comment_types', array( 'comment' ) );
if ( ! empty( $id_or_email->comment_type ) && ! \in_array( $id_or_email->comment_type, (array) $allowed_comment_types, true ) ) {
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$args['url'] = false;
/** This filter is documented in wp-includes/link-template.php */
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return \apply_filters( 'get_avatar_data', $args, $id_or_email );
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}
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// Check if comment has an avatar.
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$avatar = self::get_avatar_url( $id_or_email->comment_ID );
if ( $avatar ) {
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if ( ! isset( $args['class'] ) || ! \is_array( $args['class'] ) ) {
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$args['class'] = array( 'u-photo' );
} else {
$args['class'][] = 'u-photo';
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$args['class'] = \array_unique( $args['class'] );
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}
$args['url'] = $avatar;
$args['class'][] = 'avatar-activitypub';
}
return $args;
}
/**
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* Function to retrieve Avatar URL if stored in meta.
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*
* @param int|WP_Comment $comment
*
* @return string $url
*/
public static function get_avatar_url( $comment ) {
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if ( \is_numeric( $comment ) ) {
$comment = \get_comment( $comment );
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}
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return \get_comment_meta( $comment->comment_ID, 'avatar_url', true );
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}
/**
* Store permalink in meta, to send delete Activity
*
* @param string $post_id The Post ID
*
* @return void
*/
public static function trash_post( $post_id ) {
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\add_post_meta( $post_id, 'activitypub_canonical_url', \get_permalink( $post_id ), true );
}
/**
* Delete permalink from meta
*
* @param string $post_id The Post ID
*
* @return void
*/
public static function untrash_post( $post_id ) {
\delete_post_meta( $post_id, 'activitypub_canonical_url' );
}
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}