laipower/wp-content/plugins/activitypub/includes/functions.php

1309 lines
32 KiB
PHP

<?php
/**
* Functions file.
*
* @package Activitypub
*/
namespace Activitypub;
use WP_Error;
use Activitypub\Activity\Activity;
use Activitypub\Collection\Followers;
use Activitypub\Collection\Users;
/**
* Returns the ActivityPub default JSON-context.
*
* @return array The activitypub context.
*/
function get_context() {
$context = Activity::JSON_LD_CONTEXT;
return \apply_filters( 'activitypub_json_context', $context );
}
/**
* Send a POST request to a remote server.
*
* @param string $url The URL endpoint.
* @param string $body The Post Body.
* @param int $user_id The WordPress user ID.
*
* @return array|WP_Error The POST Response or an WP_Error.
*/
function safe_remote_post( $url, $body, $user_id ) {
return Http::post( $url, $body, $user_id );
}
/**
* Send a GET request to a remote server.
*
* @param string $url The URL endpoint.
*
* @return array|WP_Error The GET Response or an WP_Error.
*/
function safe_remote_get( $url ) {
return Http::get( $url );
}
/**
* Returns a users WebFinger "resource".
*
* @param int $user_id The user ID.
*
* @return string The User resource.
*/
function get_webfinger_resource( $user_id ) {
return Webfinger::get_user_resource( $user_id );
}
/**
* Requests the Meta-Data from the Actors profile.
*
* @param string $actor The Actor URL.
* @param bool $cached Optional. Whether the result should be cached. Default true.
*
* @return array|WP_Error The Actor profile as array or WP_Error on failure.
*/
function get_remote_metadata_by_actor( $actor, $cached = true ) {
$pre = apply_filters( 'pre_get_remote_metadata_by_actor', false, $actor );
if ( $pre ) {
return $pre;
}
if ( is_array( $actor ) ) {
if ( array_key_exists( 'id', $actor ) ) {
$actor = $actor['id'];
} elseif ( array_key_exists( 'url', $actor ) ) {
$actor = $actor['url'];
} else {
return new WP_Error(
'activitypub_no_valid_actor_identifier',
\__( 'The "actor" identifier is not valid', 'activitypub' ),
array(
'status' => 404,
'actor' => $actor,
)
);
}
}
if ( preg_match( '/^@?' . ACTIVITYPUB_USERNAME_REGEXP . '$/i', $actor ) ) {
$actor = Webfinger::resolve( $actor );
}
if ( ! $actor ) {
return new WP_Error(
'activitypub_no_valid_actor_identifier',
\__( 'The "actor" identifier is not valid', 'activitypub' ),
array(
'status' => 404,
'actor' => $actor,
)
);
}
if ( is_wp_error( $actor ) ) {
return $actor;
}
$transient_key = 'activitypub_' . $actor;
// Only check the cache if needed.
if ( $cached ) {
$metadata = \get_transient( $transient_key );
if ( $metadata ) {
return $metadata;
}
}
if ( ! \wp_http_validate_url( $actor ) ) {
$metadata = new WP_Error(
'activitypub_no_valid_actor_url',
\__( 'The "actor" is no valid URL', 'activitypub' ),
array(
'status' => 400,
'actor' => $actor,
)
);
return $metadata;
}
$response = Http::get( $actor );
if ( \is_wp_error( $response ) ) {
return $response;
}
$metadata = \wp_remote_retrieve_body( $response );
$metadata = \json_decode( $metadata, true );
if ( ! $metadata ) {
$metadata = new WP_Error(
'activitypub_invalid_json',
\__( 'No valid JSON data', 'activitypub' ),
array(
'status' => 400,
'actor' => $actor,
)
);
return $metadata;
}
\set_transient( $transient_key, $metadata, WEEK_IN_SECONDS );
return $metadata;
}
/**
* Returns the followers of a given user.
*
* @param int $user_id The user ID.
*
* @return array The followers.
*/
function get_followers( $user_id ) {
return Followers::get_followers( $user_id );
}
/**
* Count the number of followers for a given user.
*
* @param int $user_id The user ID.
*
* @return int The number of followers.
*/
function count_followers( $user_id ) {
return Followers::count_followers( $user_id );
}
/**
* Examine a url and try to determine the author ID it represents.
*
* Checks are supposedly from the hosted site blog.
*
* @param string $url Permalink to check.
*
* @return int User ID, or 0 on failure.
*/
function url_to_authorid( $url ) {
global $wp_rewrite;
// Check if url hase the same host.
if ( \wp_parse_url( \home_url(), \PHP_URL_HOST ) !== \wp_parse_url( $url, \PHP_URL_HOST ) ) {
return 0;
}
// First, check to see if there is a 'author=N' to match against.
if ( \preg_match( '/[?&]author=(\d+)/i', $url, $values ) ) {
$id = \absint( $values[1] );
if ( $id ) {
return $id;
}
}
// Check to see if we are using rewrite rules.
$rewrite = $wp_rewrite->wp_rewrite_rules();
// Not using rewrite rules, and 'author=N' method failed, so we're out of options.
if ( empty( $rewrite ) ) {
return 0;
}
// Generate rewrite rule for the author url.
$author_rewrite = $wp_rewrite->get_author_permastruct();
$author_regexp = \str_replace( '%author%', '', $author_rewrite );
// Match the rewrite rule with the passed url.
if ( \preg_match( '/https?:\/\/(.+)' . \preg_quote( $author_regexp, '/' ) . '([^\/]+)/i', $url, $match ) ) {
$user = \get_user_by( 'slug', $match[2] );
if ( $user ) {
return $user->ID;
}
}
return 0;
}
/**
* Verify that url is a wp_ap_comment or a previously received remote comment.
*
* @return int|bool Comment ID or false if not found.
*/
function is_comment() {
$comment_id = get_query_var( 'c', null );
if ( ! is_null( $comment_id ) ) {
$comment = \get_comment( $comment_id );
if ( $comment ) {
return $comment_id;
}
}
return false;
}
/**
* Check for Tombstone Objects.
*
* @see https://www.w3.org/TR/activitypub/#delete-activity-outbox
*
* @param WP_Error $wp_error A WP_Error-Response of an HTTP-Request.
*
* @return boolean True if HTTP-Code is 410 or 404.
*/
function is_tombstone( $wp_error ) {
if ( ! is_wp_error( $wp_error ) ) {
return false;
}
if ( in_array( (int) $wp_error->get_error_code(), array( 404, 410 ), true ) ) {
return true;
}
return false;
}
/**
* Get the REST URL relative to this plugin's namespace.
*
* @param string $path Optional. REST route path. Default ''.
*
* @return string REST URL relative to this plugin's namespace.
*/
function get_rest_url_by_path( $path = '' ) {
// We'll handle the leading slash.
$path = ltrim( $path, '/' );
$namespaced_path = sprintf( '/%s/%s', ACTIVITYPUB_REST_NAMESPACE, $path );
return \get_rest_url( null, $namespaced_path );
}
/**
* Convert a string from camelCase to snake_case.
*
* @param string $input The string to convert.
*
* @return string The converted string.
*/
function camel_to_snake_case( $input ) {
return strtolower( preg_replace( '/(?<!^)[A-Z]/', '_$0', $input ) );
}
/**
* Convert a string from snake_case to camelCase.
*
* @param string $input The string to convert.
*
* @return string The converted string.
*/
function snake_to_camel_case( $input ) {
return lcfirst( str_replace( '_', '', ucwords( $input, '_' ) ) );
}
/**
* Escapes a Tag, to be used as a hashtag.
*
* @param string $input The string to escape.
*
* @return string The escaped hashtag.
*/
function esc_hashtag( $input ) {
$hashtag = \wp_specialchars_decode( $input, ENT_QUOTES );
// Remove all characters that are not letters, numbers, or underscores.
$hashtag = \preg_replace( '/emoji-regex(*SKIP)(?!)|[^\p{L}\p{Nd}_]+/u', '_', $hashtag );
// Capitalize every letter that is preceded by an underscore.
$hashtag = preg_replace_callback(
'/_(.)/',
function ( $matches ) {
return strtoupper( $matches[1] );
},
$hashtag
);
// Add a hashtag to the beginning of the string.
$hashtag = ltrim( $hashtag, '#' );
$hashtag = '#' . $hashtag;
/**
* Allow defining your own custom hashtag generation rules.
*
* @param string $hashtag The hashtag to be returned.
* @param string $input The original string.
*/
$hashtag = apply_filters( 'activitypub_esc_hashtag', $hashtag, $input );
return esc_html( $hashtag );
}
/**
* Check if a request is for an ActivityPub request.
*
* @return bool False by default.
*/
function is_activitypub_request() {
global $wp_query;
/*
* ActivityPub requests are currently only made for
* author archives, singular posts, and the homepage.
*/
if ( ! \is_author() && ! \is_singular() && ! \is_home() && ! defined( '\REST_REQUEST' ) ) {
return false;
}
// Check if the current post type supports ActivityPub.
if ( \is_singular() ) {
$queried_object = \get_queried_object();
$post_type = \get_post_type( $queried_object );
if ( ! \post_type_supports( $post_type, 'activitypub' ) ) {
return false;
}
}
// Check if header already sent.
if ( ! \headers_sent() && ACTIVITYPUB_SEND_VARY_HEADER ) {
// Send Vary header for Accept header.
\header( 'Vary: Accept' );
}
// One can trigger an ActivityPub request by adding ?activitypub to the URL.
if ( isset( $wp_query->query_vars['activitypub'] ) ) {
return true;
}
/*
* The other (more common) option to make an ActivityPub request
* is to send an Accept header.
*/
if ( isset( $_SERVER['HTTP_ACCEPT'] ) ) {
$accept = sanitize_text_field( wp_unslash( $_SERVER['HTTP_ACCEPT'] ) );
/*
* $accept can be a single value, or a comma separated list of values.
* We want to support both scenarios,
* and return true when the header includes at least one of the following:
* - application/activity+json
* - application/ld+json
* - application/json
*/
if ( preg_match( '/(application\/(ld\+json|activity\+json|json))/i', $accept ) ) {
return true;
}
}
return false;
}
/**
* This function checks if a user is disabled for ActivityPub.
*
* @param int $user_id The user ID.
*
* @return boolean True if the user is disabled, false otherwise.
*/
function is_user_disabled( $user_id ) {
$return = false;
switch ( $user_id ) {
// if the user is the application user, it's always enabled.
case \Activitypub\Collection\Users::APPLICATION_USER_ID:
$return = false;
break;
// if the user is the blog user, it's only enabled in single-user mode.
case \Activitypub\Collection\Users::BLOG_USER_ID:
if ( is_user_type_disabled( 'blog' ) ) {
$return = true;
break;
}
$return = false;
break;
// if the user is any other user, it's enabled if it can publish posts.
default:
if ( ! \get_user_by( 'id', $user_id ) ) {
$return = true;
break;
}
if ( is_user_type_disabled( 'user' ) ) {
$return = true;
break;
}
if ( ! \user_can( $user_id, 'activitypub' ) ) {
$return = true;
break;
}
$return = false;
break;
}
/**
* Allow plugins to disable users for ActivityPub.
*
* @param boolean $return True if the user is disabled, false otherwise.
* @param int $user_id The User-ID.
*/
return apply_filters( 'activitypub_is_user_disabled', $return, $user_id );
}
/**
* Checks if a User-Type is disabled for ActivityPub.
*
* This function is used to check if the 'blog' or 'user'
* type is disabled for ActivityPub.
*
* @param string $type User type. 'blog' or 'user'.
*
* @return boolean True if the user type is disabled, false otherwise.
*/
function is_user_type_disabled( $type ) {
switch ( $type ) {
case 'blog':
if ( \defined( 'ACTIVITYPUB_SINGLE_USER_MODE' ) ) {
if ( ACTIVITYPUB_SINGLE_USER_MODE ) {
$return = false;
break;
}
}
if ( \defined( 'ACTIVITYPUB_DISABLE_BLOG_USER' ) ) {
$return = ACTIVITYPUB_DISABLE_BLOG_USER;
break;
}
if ( '1' !== \get_option( 'activitypub_enable_blog_user', '0' ) ) {
$return = true;
break;
}
$return = false;
break;
case 'user':
if ( \defined( 'ACTIVITYPUB_SINGLE_USER_MODE' ) ) {
if ( ACTIVITYPUB_SINGLE_USER_MODE ) {
$return = true;
break;
}
}
if ( \defined( 'ACTIVITYPUB_DISABLE_USER' ) ) {
$return = ACTIVITYPUB_DISABLE_USER;
break;
}
if ( '1' !== \get_option( 'activitypub_enable_users', '1' ) ) {
$return = true;
break;
}
$return = false;
break;
default:
$return = new WP_Error(
'activitypub_wrong_user_type',
__( 'Wrong user type', 'activitypub' ),
array( 'status' => 400 )
);
break;
}
/**
* Allow plugins to disable user types for ActivityPub.
*
* @param boolean $return True if the user type is disabled, false otherwise.
* @param string $type The User-Type.
*/
return apply_filters( 'activitypub_is_user_type_disabled', $return, $type );
}
/**
* Check if the blog is in single-user mode.
*
* @return boolean True if the blog is in single-user mode, false otherwise.
*/
function is_single_user() {
if (
false === is_user_type_disabled( 'blog' ) &&
true === is_user_type_disabled( 'user' )
) {
return true;
}
return false;
}
/**
* Check if a site supports the block editor.
*
* @return boolean True if the site supports the block editor, false otherwise.
*/
function site_supports_blocks() {
if ( \version_compare( \get_bloginfo( 'version' ), '5.9', '<' ) ) {
return false;
}
if ( ! \function_exists( 'register_block_type_from_metadata' ) ) {
return false;
}
/**
* Allow plugins to disable block editor support,
* thus disabling blocks registered by the ActivityPub plugin.
*
* @param boolean $supports_blocks True if the site supports the block editor, false otherwise.
*/
return apply_filters( 'activitypub_site_supports_blocks', true );
}
/**
* Check if data is valid JSON.
*
* @param string $data The data to check.
*
* @return boolean True if the data is JSON, false otherwise.
*/
function is_json( $data ) {
return \is_array( \json_decode( $data, true ) ) ? true : false;
}
/**
* Check whther a blog is public based on the `blog_public` option.
*
* @return bool True if public, false if not
*/
function is_blog_public() {
/**
* Filter whether the blog is public.
*
* @param bool $public Whether the blog is public.
*/
return (bool) apply_filters( 'activitypub_is_blog_public', \get_option( 'blog_public', 1 ) );
}
/**
* Sanitize a URL.
*
* @param string $value The URL to sanitize.
*
* @return string|null The sanitized URL or null if invalid.
*/
function sanitize_url( $value ) {
if ( filter_var( $value, FILTER_VALIDATE_URL ) === false ) {
return null;
}
return esc_url_raw( $value );
}
/**
* Extract recipient URLs from Activity object.
*
* @param array $data The Activity object as array.
*
* @return array The list of user URLs.
*/
function extract_recipients_from_activity( $data ) {
$recipient_items = array();
foreach ( array( 'to', 'bto', 'cc', 'bcc', 'audience' ) as $i ) {
if ( array_key_exists( $i, $data ) ) {
if ( is_array( $data[ $i ] ) ) {
$recipient = $data[ $i ];
} else {
$recipient = array( $data[ $i ] );
}
$recipient_items = array_merge( $recipient_items, $recipient );
}
if ( is_array( $data['object'] ) && array_key_exists( $i, $data['object'] ) ) {
if ( is_array( $data['object'][ $i ] ) ) {
$recipient = $data['object'][ $i ];
} else {
$recipient = array( $data['object'][ $i ] );
}
$recipient_items = array_merge( $recipient_items, $recipient );
}
}
$recipients = array();
// Flatten array.
foreach ( $recipient_items as $recipient ) {
if ( is_array( $recipient ) ) {
// Check if recipient is an object.
if ( array_key_exists( 'id', $recipient ) ) {
$recipients[] = $recipient['id'];
}
} else {
$recipients[] = $recipient;
}
}
return array_unique( $recipients );
}
/**
* Check if passed Activity is Public.
*
* @param array $data The Activity object as array.
*
* @return boolean True if public, false if not.
*/
function is_activity_public( $data ) {
$recipients = extract_recipients_from_activity( $data );
return in_array( 'https://www.w3.org/ns/activitystreams#Public', $recipients, true );
}
/**
* Get active users based on a given duration.
*
* @param int $duration Optional. The duration to check in month(s). Default 1.
*
* @return int The number of active users.
*/
function get_active_users( $duration = 1 ) {
$duration = intval( $duration );
$transient_key = sprintf( 'monthly_active_users_%d', $duration );
$count = get_transient( $transient_key );
if ( false === $count ) {
global $wpdb;
// phpcs:ignore WordPress.DB.DirectDatabaseQuery
$count = $wpdb->get_var(
$wpdb->prepare(
"SELECT COUNT( DISTINCT post_author ) FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' AND post_date <= DATE_SUB( NOW(), INTERVAL %d MONTH )",
$duration
)
);
set_transient( $transient_key, $count, DAY_IN_SECONDS );
}
// If 0 authors where active.
if ( 0 === $count ) {
return 0;
}
// If single user mode.
if ( is_single_user() ) {
return 1;
}
// If blog user is disabled.
if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
return (int) $count;
}
// Also count blog user.
return (int) $count + 1;
}
/**
* Get the total number of users.
*
* @return int The total number of users.
*/
function get_total_users() {
// If single user mode.
if ( is_single_user() ) {
return 1;
}
$users = \get_users(
array(
'capability__in' => array( 'activitypub' ),
)
);
if ( is_array( $users ) ) {
$users = count( $users );
} else {
$users = 1;
}
// If blog user is disabled.
if ( is_user_disabled( Users::BLOG_USER_ID ) ) {
return (int) $users;
}
return (int) $users + 1;
}
/**
* Examine a comment ID and look up an existing comment it represents.
*
* @param string $id ActivityPub object ID (usually a URL) to check.
*
* @return \WP_Comment|boolean Comment, or false on failure.
*/
function object_id_to_comment( $id ) {
return Comment::object_id_to_comment( $id );
}
/**
* Verify that URL is a local comment or a previously received remote comment.
* (For threading comments locally)
*
* @param string $url The URL to check.
*
* @return string|null Comment ID or null if not found
*/
function url_to_commentid( $url ) {
return Comment::url_to_commentid( $url );
}
/**
* Get the URI of an ActivityPub object.
*
* @param array|string $data The ActivityPub object.
*
* @return string The URI of the ActivityPub object
*/
function object_to_uri( $data ) {
// Check whether it is already simple.
if ( ! $data || is_string( $data ) ) {
return $data;
}
/*
* Check if it is a list, then take first item.
* This plugin does not support collections.
*/
if ( array_is_list( $data ) ) {
$data = $data[0];
}
// Check if it is simplified now.
if ( is_string( $data ) ) {
return $data;
}
$type = 'Object';
if ( isset( $data['type'] ) ) {
$type = $data['type'];
}
// Return part of Object that makes most sense.
switch ( $type ) {
case 'Link':
$data = $data['href'];
break;
default:
$data = $data['id'];
break;
}
return $data;
}
/**
* Check if a comment should be federated.
*
* We consider a comment should be federated if it is authored by a user that is
* not disabled for federation and if it is a reply directly to the post or to a
* federated comment.
*
* @param mixed $comment Comment object or ID.
*
* @return boolean True if the comment should be federated, false otherwise.
*/
function should_comment_be_federated( $comment ) {
return Comment::should_be_federated( $comment );
}
/**
* Check if a comment was federated.
*
* This function checks if a comment was federated via ActivityPub.
*
* @param mixed $comment Comment object or ID.
*
* @return boolean True if the comment was federated, false otherwise.
*/
function was_comment_sent( $comment ) {
return Comment::was_sent( $comment );
}
/**
* Check if a comment is federated.
*
* We consider a comment federated if comment was received via ActivityPub.
*
* Use this function to check if it is comment that was received via ActivityPub.
*
* @param mixed $comment Comment object or ID.
*
* @return boolean True if the comment is federated, false otherwise.
*/
function was_comment_received( $comment ) {
return Comment::was_received( $comment );
}
/**
* Check if a comment is local only.
*
* This function checks if a comment is local only and was not sent or received via ActivityPub.
*
* @param mixed $comment Comment object or ID.
*
* @return boolean True if the comment is local only, false otherwise.
*/
function is_local_comment( $comment ) {
return Comment::is_local( $comment );
}
/**
* Mark a WordPress object as federated.
*
* @param \WP_Comment|\WP_Post $wp_object The WordPress object.
* @param string $state The state of the object.
*/
function set_wp_object_state( $wp_object, $state ) {
$meta_key = 'activitypub_status';
if ( $wp_object instanceof \WP_Post ) {
\update_post_meta( $wp_object->ID, $meta_key, $state );
} elseif ( $wp_object instanceof \WP_Comment ) {
\update_comment_meta( $wp_object->comment_ID, $meta_key, $state );
} else {
/**
* Allow plugins to mark WordPress objects as federated.
*
* @param \WP_Comment|\WP_Post $wp_object The WordPress object.
* @param string $state The state of the object.
*/
\apply_filters( 'activitypub_mark_wp_object_as_federated', $wp_object );
}
}
/**
* Get the federation state of a WordPress object.
*
* @param \WP_Comment|\WP_Post $wp_object The WordPress object.
*
* @return string|false The state of the object or false if not found.
*/
function get_wp_object_state( $wp_object ) {
$meta_key = 'activitypub_status';
if ( $wp_object instanceof \WP_Post ) {
return \get_post_meta( $wp_object->ID, $meta_key, true );
} elseif ( $wp_object instanceof \WP_Comment ) {
return \get_comment_meta( $wp_object->comment_ID, $meta_key, true );
} else {
/**
* Allow plugins to get the federation state of a WordPress object.
*
* @param \WP_Comment|\WP_Post $wp_object The WordPress object.
*/
return \apply_filters( 'activitypub_get_wp_object_state', false, $wp_object );
}
}
/**
* Get the description of a post type.
*
* Set some default descriptions for the default post types.
*
* @param \WP_Post_Type $post_type The post type object.
*
* @return string The description of the post type.
*/
function get_post_type_description( $post_type ) {
$description = '';
switch ( $post_type->name ) {
case 'post':
$description = '';
break;
case 'page':
$description = '';
break;
case 'attachment':
$description = ' - ' . __( 'The attachments that you have uploaded to a post (images, videos, documents or other files).', 'activitypub' );
break;
default:
if ( ! empty( $post_type->description ) ) {
$description = ' - ' . $post_type->description;
}
}
/**
* Allow plugins to get the description of a post type.
*
* @param string $description The description of the post type.
* @param \WP_Post_Type $post_type The post type object.
*/
return apply_filters( 'activitypub_post_type_description', $description, $post_type->name, $post_type );
}
/**
* Get the masked WordPress version to only show the major and minor version.
*
* @return string The masked version.
*/
function get_masked_wp_version() {
// Only show the major and minor version.
$version = get_bloginfo( 'version' );
// Strip the RC or beta part.
$version = preg_replace( '/-.*$/', '', $version );
$version = explode( '.', $version );
$version = array_slice( $version, 0, 2 );
return implode( '.', $version );
}
/**
* Get the enclosures of a post.
*
* @param int $post_id The post ID.
*
* @return array The enclosures.
*/
function get_enclosures( $post_id ) {
$enclosures = get_post_meta( $post_id, 'enclosure', false );
if ( ! $enclosures ) {
return array();
}
$enclosures = array_map(
function ( $enclosure ) {
$attributes = explode( "\n", $enclosure );
if ( ! isset( $attributes[0] ) || ! \wp_http_validate_url( $attributes[0] ) ) {
return false;
}
return array(
'url' => $attributes[0],
'length' => isset( $attributes[1] ) ? trim( $attributes[1] ) : null,
'mediaType' => isset( $attributes[2] ) ? trim( $attributes[2] ) : null,
);
},
$enclosures
);
return array_filter( $enclosures );
}
/**
* Retrieves the IDs of the ancestors of a comment.
*
* Adaption of `get_post_ancestors` from WordPress core.
*
* @see https://developer.wordpress.org/reference/functions/get_post_ancestors/
*
* @param int|\WP_Comment $comment Comment ID or comment object.
*
* @return \WP_Comment[] Array of ancestor comments or empty array if there are none.
*/
function get_comment_ancestors( $comment ) {
$comment = \get_comment( $comment );
if ( ! $comment || empty( $comment->comment_parent ) || (int) $comment->comment_parent === (int) $comment->comment_ID ) {
return array();
}
$ancestors = array();
$id = (int) $comment->comment_parent;
$ancestors[] = $id;
while ( $id > 0 ) {
$ancestor = \get_comment( $id );
$parent_id = (int) $ancestor->comment_parent;
// Loop detection: If the ancestor has been seen before, break.
if ( empty( $parent_id ) || ( $parent_id === (int) $comment->comment_ID ) || in_array( $parent_id, $ancestors, true ) ) {
break;
}
$id = $parent_id;
$ancestors[] = $id;
}
return $ancestors;
}
/**
* Change the display of large numbers on the site.
*
* @author Jeremy Herve
*
* @see https://wordpress.org/support/topic/abbreviate-numbers-with-k/
*
* @param string $formatted Converted number in string format.
* @param float $number The number to convert based on locale.
* @param int $decimals Precision of the number of decimal places.
*
* @return string Converted number in string format.
*/
function custom_large_numbers( $formatted, $number, $decimals ) {
global $wp_locale;
$decimals = 0;
$decimal_point = '.';
$thousands_sep = ',';
if ( isset( $wp_locale ) ) {
$decimals = (int) $wp_locale->number_format['decimal_point'];
$decimal_point = $wp_locale->number_format['decimal_point'];
$thousands_sep = $wp_locale->number_format['thousands_sep'];
}
if ( $number < 1000 ) { // Any number less than a Thousand.
return \number_format( $number, $decimals, $decimal_point, $thousands_sep );
} elseif ( $number < 1000000 ) { // Any number less than a million.
return \number_format( $number / 1000, $decimals, $decimal_point, $thousands_sep ) . 'K';
} elseif ( $number < 1000000000 ) { // Any number less than a billion.
return \number_format( $number / 1000000, $decimals, $decimal_point, $thousands_sep ) . 'M';
} else { // At least a billion.
return \number_format( $number / 1000000000, $decimals, $decimal_point, $thousands_sep ) . 'B';
}
// Default fallback. We should not get here.
return $formatted;
}
/**
* Registers a ActivityPub comment type.
*
* @param string $comment_type Key for comment type.
* @param array $args Optional. Array of arguments for registering a comment type. Default empty array.
*
* @return array The registered Activitypub comment type.
*/
function register_comment_type( $comment_type, $args = array() ) {
global $activitypub_comment_types;
if ( ! is_array( $activitypub_comment_types ) ) {
$activitypub_comment_types = array();
}
// Sanitize comment type name.
$comment_type = sanitize_key( $comment_type );
$activitypub_comment_types[ $comment_type ] = $args;
/**
* Fires after a ActivityPub comment type is registered.
*
* @param string $comment_type Comment type.
* @param array $args Arguments used to register the comment type.
*/
do_action( 'activitypub_registered_comment_type', $comment_type, $args );
return $args;
}
/**
* Normalize a URL.
*
* @param string $url The URL.
*
* @return string The normalized URL.
*/
function normalize_url( $url ) {
$url = \untrailingslashit( $url );
$url = \str_replace( 'https://', '', $url );
$url = \str_replace( 'http://', '', $url );
$url = \str_replace( 'www.', '', $url );
return $url;
}
/**
* Normalize a host.
*
* @param string $host The host.
*
* @return string The normalized host.
*/
function normalize_host( $host ) {
return \str_replace( 'www.', '', $host );
}
/**
* Get the reply intent URI.
*
* @return string The reply intent URI.
*/
function get_reply_intent_uri() {
return sprintf(
'javascript:(()=>{window.open(\'%s\'+encodeURIComponent(window.location.href));})();',
esc_url( \admin_url( 'post-new.php?in_reply_to=' ) )
);
}
/**
* Replace content with links, mentions or hashtags by Regex callback and not affect protected tags.
*
* @param string $content The content that should be changed.
* @param string $regex The regex to use.
* @param callable $regex_callback Callback for replacement logic.
*
* @return string The content with links, mentions, hashtags, etc.
*/
function enrich_content_data( $content, $regex, $regex_callback ) {
// Small protection against execution timeouts: limit to 1 MB.
if ( mb_strlen( $content ) > MB_IN_BYTES ) {
return $content;
}
$tag_stack = array();
$protected_tags = array(
'pre',
'code',
'textarea',
'style',
'a',
);
$content_with_links = '';
$in_protected_tag = false;
foreach ( wp_html_split( $content ) as $chunk ) {
if ( preg_match( '#^<!--[\s\S]*-->$#i', $chunk, $m ) ) {
$content_with_links .= $chunk;
continue;
}
if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) {
$tag = strtolower( $m[2] );
if ( '/' === $m[1] ) {
// Closing tag.
$i = array_search( $tag, $tag_stack, true );
// We can only remove the tag from the stack if it is in the stack.
if ( false !== $i ) {
$tag_stack = array_slice( $tag_stack, 0, $i );
}
} else {
// Opening tag, add it to the stack.
$tag_stack[] = $tag;
}
// If we're in a protected tag, the tag_stack contains at least one protected tag string.
// The protected tag state can only change when we encounter a start or end tag.
$in_protected_tag = array_intersect( $tag_stack, $protected_tags );
// Never inspect tags.
$content_with_links .= $chunk;
continue;
}
if ( $in_protected_tag ) {
// Don't inspect a chunk inside an inspected tag.
$content_with_links .= $chunk;
continue;
}
// Only reachable when there is no protected tag in the stack.
$content_with_links .= \preg_replace_callback( $regex, $regex_callback, $chunk );
}
return $content_with_links;
}
/**
* Generate a summary of a post.
*
* This function generates a summary of a post by extracting:
*
* 1. The post excerpt if it exists.
* 2. The first part of the post content if it contains the <!--more--> tag.
* 3. An excerpt of the post content if it is longer than the specified length.
*
* @param int|\WP_Post $post The post ID or post object.
* @param integer $length The maximum length of the summary.
* Default is 500. It will be ignored if the post excerpt
* and the content above the <!--more--> tag.
*
* @return string The generated post summary.
*/
function generate_post_summary( $post, $length = 500 ) {
$post = get_post( $post );
if ( ! $post ) {
return '';
}
$content = \sanitize_post_field( 'post_excerpt', $post->post_excerpt, $post->ID );
if ( $content ) {
/**
* Filters the post excerpt.
*
* @param string $content The post excerpt.
*/
return \apply_filters( 'the_excerpt', $content );
}
$content = \sanitize_post_field( 'post_content', $post->post_content, $post->ID );
$content_parts = \get_extended( $content );
/**
* Filters the excerpt more value.
*
* @param string $excerpt_more The excerpt more.
*/
$excerpt_more = \apply_filters( 'activitypub_excerpt_more', '[…]' );
$length = $length - strlen( $excerpt_more );
// Check for the <!--more--> tag.
if (
! empty( $content_parts['extended'] ) &&
! empty( $content_parts['main'] )
) {
$content = $content_parts['main'] . ' ' . $excerpt_more;
$length = null;
}
$content = \html_entity_decode( $content );
$content = \wp_strip_all_tags( $content );
$content = \trim( $content );
$content = \preg_replace( '/\R+/m', "\n\n", $content );
$content = \preg_replace( '/[\r\t]/', '', $content );
if ( $length && \strlen( $content ) > $length ) {
$content = \wordwrap( $content, $length, '</activitypub-summary>' );
$content = \explode( '</activitypub-summary>', $content, 2 );
$content = $content[0] . ' ' . $excerpt_more;
}
/*
Removed until this is merged: https://github.com/mastodon/mastodon/pull/28629
return \apply_filters( 'the_excerpt', $content );
*/
return $content;
}
/**
* Get the content warning of a post.
*
* @param int|\WP_Post $post_id The post ID or post object.
*
* @return string|false The content warning or false if not found.
*/
function get_content_warning( $post_id ) {
$post = get_post( $post_id );
if ( ! $post ) {
return false;
}
$warning = get_post_meta( $post->ID, 'activitypub_content_warning', true );
if ( empty( $warning ) ) {
return false;
}
return $warning;
}