530 lines
14 KiB
PHP
530 lines
14 KiB
PHP
<?php
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namespace Activitypub;
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define('AS_PUBLIC', 'https://www.w3.org/ns/activitystreams#Public');
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/**
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* Returns the ActivityPub default JSON-context
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*
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* @return array the activitypub context
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*/
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function get_context() {
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$context = array(
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'https://www.w3.org/ns/activitystreams',
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'https://w3id.org/security/v1',
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array(
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'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
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'PropertyValue' => 'schema:PropertyValue',
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'schema' => 'http://schema.org#',
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'pt' => 'https://joinpeertube.org/ns#',
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'toot' => 'http://joinmastodon.org/ns#',
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'value' => 'schema:value',
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'Hashtag' => 'as:Hashtag',
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'featured' => array(
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'@id' => 'toot:featured',
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'@type' => '@id',
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),
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'featuredTags' => array(
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'@id' => 'toot:featuredTags',
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'@type' => '@id',
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),
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),
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);
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return \apply_filters( 'activitypub_json_context', $context );
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}
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function safe_remote_post( $url, $body, $user_id ) {
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$date = \gmdate( 'D, d M Y H:i:s T' );
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$digest = \Activitypub\Signature::generate_digest( $body );
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$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date, $digest );
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$wp_version = \get_bloginfo( 'version' );
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$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
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$args = array(
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'timeout' => 100,
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'limit_response_size' => 1048576,
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'redirection' => 3,
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'user-agent' => "$user_agent; ActivityPub",
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'headers' => array(
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'Accept' => 'application/activity+json',
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'Content-Type' => 'application/activity+json',
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'Digest' => "SHA-256=$digest",
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'Signature' => $signature,
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'Date' => $date,
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),
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'body' => $body,
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);
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$response = \wp_safe_remote_post( $url, $args );
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\do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id );
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return $response;
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}
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function forward_remote_post( $url, $body, $user_id ) {
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$date = \gmdate( 'D, d M Y H:i:s T' );
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$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date );
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$wp_version = \get_bloginfo( 'version' );
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$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
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$args = array(
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'timeout' => 100,
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'limit_response_size' => 1048576,
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'redirection' => 3,
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'user-agent' => "$user_agent; ActivityPub",
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'headers' => array(
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'Accept' => 'application/activity+json',
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'Content-Type' => 'application/activity+json',
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'Digest' => "SHA-256=$digest",
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'Signature' => $signature,
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'Date' => $date,
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),
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'body' => $body,
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);
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$response = \wp_safe_remote_post( $url, $args );
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\do_action( 'activitypub_forward_remote_post_response', $response, $url, $body, $user_id );
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return $response;
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}
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function safe_remote_get( $url, $user_id ) {
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$date = \gmdate( 'D, d M Y H:i:s T' );
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$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date );
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$wp_version = \get_bloginfo( 'version' );
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$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
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$args = array(
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'timeout' => 100,
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'limit_response_size' => 1048576,
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'redirection' => 3,
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'user-agent' => "$user_agent; ActivityPub",
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'headers' => array(
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'Accept' => 'application/activity+json',
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'Content-Type' => 'application/activity+json',
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'Signature' => $signature,
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'Date' => $date,
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),
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);
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$response = \wp_safe_remote_get( $url, $args );
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\do_action( 'activitypub_safe_remote_get_response', $response, $url, $user_id );
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return $response;
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}
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/**
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* Returns a users WebFinger "resource"
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*
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* @param int $user_id
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*
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* @return string The user-resource
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*/
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function get_webfinger_resource( $user_id ) {
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// use WebFinger plugin if installed
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if ( \function_exists( '\get_webfinger_resource' ) ) {
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return \get_webfinger_resource( $user_id, false );
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}
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$user = \get_user_by( 'id', $user_id );
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return $user->user_login . '@' . \wp_parse_url( \home_url(), \PHP_URL_HOST );
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}
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/**
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* [get_metadata_by_actor description]
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*
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* @param sting $actor
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*
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* @return array
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*/
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function get_remote_metadata_by_actor( $actor ) {
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$metadata = \get_transient( 'activitypub_' . $actor );
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if ( $metadata ) {
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return $metadata;
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}
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if ( ! \wp_http_validate_url( $actor ) ) {
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return new \WP_Error( 'activitypub_no_valid_actor_url', \__( 'The "actor" is no valid URL', 'activitypub' ), $actor );
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}
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$user = \get_users(
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array(
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'number' => 1,
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'who' => 'authors',
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'fields' => 'ID',
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)
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);
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// we just need any user to generate a request signature
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$user_id = \reset( $user );
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$response = \Activitypub\safe_remote_get( $actor, $user_id );
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if ( \is_wp_error( $response ) ) {
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return $response;
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}
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$metadata = \wp_remote_retrieve_body( $response );
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$metadata = \json_decode( $metadata, true );
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if ( ! $metadata ) {
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return new \WP_Error( 'activitypub_invalid_json', \__( 'No valid JSON data', 'activitypub' ), $actor );
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}
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\set_transient( 'activitypub_' . $actor, $metadata, WEEK_IN_SECONDS );
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return $metadata;
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}
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/**
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* [get_inbox_by_actor description]
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* @param [type] $actor [description]
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* @return [type] [description]
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*/
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function get_inbox_by_actor( $actor ) {
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$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
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if ( \is_wp_error( $metadata ) ) {
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return $metadata;
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}
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if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) {
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return $metadata['endpoints']['sharedInbox'];
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}
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if ( \array_key_exists( 'inbox', $metadata ) ) {
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return $metadata['inbox'];
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}
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return new \WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata );
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}
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/**
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* [get_inbox_by_actor description]
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* @param [type] $actor [description]
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* @return [type] [description]
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*/
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function get_publickey_by_actor( $actor, $key_id ) {
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$metadata = \Activitypub\get_remote_metadata_by_actor( $actor );
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if ( \is_wp_error( $metadata ) ) {
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return $metadata;
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}
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if (
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isset( $metadata['publicKey'] ) &&
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isset( $metadata['publicKey']['id'] ) &&
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isset( $metadata['publicKey']['owner'] ) &&
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isset( $metadata['publicKey']['publicKeyPem'] ) &&
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$key_id === $metadata['publicKey']['id'] &&
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$actor === $metadata['publicKey']['owner']
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) {
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return $metadata['publicKey']['publicKeyPem'];
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}
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return new \WP_Error( 'activitypub_no_public_key', \__( 'No "Public-Key" found', 'activitypub' ), $metadata );
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}
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function get_follower_inboxes( $user_id ) {
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$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
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$inboxes = array();
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foreach ( $followers as $follower ) {
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$inbox = \Activitypub\get_inbox_by_actor( $follower );
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if ( ! $inbox || \is_wp_error( $inbox ) ) {
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continue;
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}
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// init array if empty
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if ( ! isset( $inboxes[ $inbox ] ) ) {
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$inboxes[ $inbox ] = array();
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}
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$inboxes[ $inbox ][] = $follower;
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}
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return $inboxes;
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}
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function get_identifier_settings( $user_id ) {
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?>
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<table class="form-table">
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<tbody>
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<tr>
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<th scope="row">
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<label><?php \esc_html_e( 'Profile identifier', 'activitypub' ); ?></label>
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</th>
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<td>
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<p><code><?php echo \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ); ?></code> or <code><?php echo \esc_url( \get_author_posts_url( $user_id ) ); ?></code></p>
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<?php // translators: the webfinger resource ?>
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<p class="description"><?php \printf( \esc_html__( 'Try to follow "@%s" in the Mastodon/Friendica search field.', 'activitypub' ), \esc_html( \Activitypub\get_webfinger_resource( $user_id ) ) ); ?></p>
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</td>
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</tr>
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</tbody>
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</table>
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<?php
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}
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function get_followers( $user_id ) {
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$followers = \Activitypub\Peer\Followers::get_followers( $user_id );
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if ( ! $followers ) {
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return array();
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}
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return $followers;
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}
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function count_followers( $user_id ) {
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$followers = \Activitypub\get_followers( $user_id );
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return \count( $followers );
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}
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/**
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* Examine a url and try to determine the author ID it represents.
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*
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* Checks are supposedly from the hosted site blog.
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*
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* @param string $url Permalink to check.
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*
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* @return int User ID, or 0 on failure.
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*/
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function url_to_authorid( $url ) {
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global $wp_rewrite;
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// check if url hase the same host
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if ( \wp_parse_url( \site_url(), \PHP_URL_HOST ) !== \wp_parse_url( $url, \PHP_URL_HOST ) ) {
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return 0;
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}
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// first, check to see if there is a 'author=N' to match against
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if ( \preg_match( '/[?&]author=(\d+)/i', $url, $values ) ) {
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$id = \absint( $values[1] );
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if ( $id ) {
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return $id;
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}
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}
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// check to see if we are using rewrite rules
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$rewrite = $wp_rewrite->wp_rewrite_rules();
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// not using rewrite rules, and 'author=N' method failed, so we're out of options
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if ( empty( $rewrite ) ) {
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return 0;
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}
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// generate rewrite rule for the author url
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$author_rewrite = $wp_rewrite->get_author_permastruct();
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$author_regexp = \str_replace( '%author%', '', $author_rewrite );
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// match the rewrite rule with the passed url
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if ( \preg_match( '/https?:\/\/(.+)' . \preg_quote( $author_regexp, '/' ) . '([^\/]+)/i', $url, $match ) ) {
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$user = \get_user_by( 'slug', $match[2] );
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if ( $user ) {
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return $user->ID;
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}
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}
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return 0;
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}
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/**
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* Verify if url is a local comment,
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* Or if it is a previously received remote comment
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*
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* return int comment_id
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*/
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function url_to_commentid( $comment_url ) {
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if ( empty( $comment_url ) ) {
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return null;
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}
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$post_url = \url_to_postid( $comment_url );
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if ( $post_url ) {
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//for local comment parent
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$comment_id = explode( '#comment-', $comment_url );
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if ( isset( $comment_id[1] ) ){
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return $comment_id[1];
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} else {
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return null;
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}
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} else {
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//remote comment parent, assuming the parent was also recieved
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//Compare inReplyTo with source_url from meta, to determine if local comment_id exists for peer replied object
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$comment_args = array(
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'type' => 'activitypub',
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'meta_query' => array(
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array(
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'key' => 'source_url',
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'value' => $comment_url,
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)
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)
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);
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$comments_query = new \WP_Comment_Query;
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$comments = $comments_query->query( $comment_args );
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$found_comment_ids = array();
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if ( $comments ) {
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foreach ( $comments as $comment ) {
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$found_comment_ids[] = $comment->comment_ID;
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}
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return $found_comment_ids[0];
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}
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return null;
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}
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}
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/**
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* Get tagged users from received AP object meta
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* @param string $object_id a comment_id to search
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* @param boolean $post defaults to searching a comment_id
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*
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* @return array of tagged users
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*/
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function get_recipients( $object_id, $post = null ) {
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$tagged_users_name = null;
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if ( $post ) {
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//post
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$ap_object = \unserialize( \get_post_meta( $object_id, 'ap_object', true ) );
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} else {
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//comment
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$ap_object = \unserialize( \get_comment_meta( $object_id, 'ap_object', true ) );
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}
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if ( !empty( $ap_object ) ) {
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$tagged_users_name[] = \Activitypub\url_to_webfinger( $ap_object['actor'] );
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if ( !empty( $ap_object['object']['tag'] ) ) {
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$author_post_url = \get_author_posts_url( $ap_object['user_id'] );
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foreach ( $ap_object['object']['tag'] as $tag ) {
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if ( $author_post_url == $tag['href'] ) {
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continue;
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}
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if ( in_array( 'Mention', $tag ) ) {
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$tagged_users_name[] = $tag['name'];
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}
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}
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}
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return implode( ' ', $tagged_users_name );
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}
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}
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/**
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* Add summary to reply
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*/
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function get_summary( $comment_id ) {
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$ap_object = \unserialize( \get_comment_meta( $comment_id, 'ap_object', true ) );
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if ( !empty( $ap_object ) ) {
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if ( !empty( $ap_object['object']['summary'] ) ) {
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return \esc_attr( $ap_object['object']['summary'] );
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}
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}
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}
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/**
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* parse content for tags to transform
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* @param string $content to search
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*/
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function transform_tags( $content ) {
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//#tags
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//@Mentions
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$mentions = null;
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$webfinger_tags = \Activitypub\webfinger_extract( $content, true );
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if ( !empty( $webfinger_tags) ) {
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foreach ( $webfinger_tags[0] as $webfinger_tag ) {
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$ap_profile = \Activitypub\Rest\Webfinger::webfinger_lookup( $webfinger_tag );
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if ( ! empty( $ap_profile ) ) {
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$short_tag = \Activitypub\webfinger_short_tag( $webfinger_tag );
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$webfinger_link = "<span class='h-card'><a href=\"{$ap_profile['href']}\" class='u-url mention' rel='noopener noreferer' target='_blank'>{$short_tag}</a></span>";
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$content = str_replace( $webfinger_tag, $webfinger_link, $content );
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$mentions[] = $ap_profile;
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}
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}
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}
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// Return mentions separately to attach to comment/post meta
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$content_mentions['mentions'] = $mentions;
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$content_mentions['content'] = $content;
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return $content_mentions;
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}
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function tag_user( $recipient ) {
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$tagged_user = array(
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'type' => 'Mention',
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'href' => $recipient,
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'name' => \Activitypub\url_to_webfinger( $recipient ),
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);
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$tag[] = $tagged_user;
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return $tag;
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}
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/**
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* @param string $content
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* @return array of all matched webfinger
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*/
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function webfinger_extract( $string ) {
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preg_match_all("/@[\._a-zA-Z0-9-]+@[\._a-zA-Z0-9-]+/i", $string, $matches);
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return $matches;
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}
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/**
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* @param string full $webfinger
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* @return string short @webfinger
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*/
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function webfinger_short_tag( $webfinger ) {
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$short_tag = explode( '@', $webfinger );
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return '@' . $short_tag[1];
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}
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/**
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* @param string $user_url
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* @return string $webfinger
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*/
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function url_to_webfinger( $user_url ) {
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$user_url = \untrailingslashit( $user_url );
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$user_url_array = explode( '/', $user_url );
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$user_name = end( $user_url_array );
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$url_host = parse_url( $user_url , PHP_URL_HOST );
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$webfinger = '@' . $user_name . '@' . $url_host;
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return $webfinger;
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}
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/**
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* Transform comment url, replace #fragment with ?query
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*
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* AP Object ID must be unique
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*
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* https://www.w3.org/TR/activitypub/#obj-id
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* https://github.com/tootsuite/mastodon/issues/13879
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*/
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function normalize_comment_url( $comment ) {
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$comment_id = explode( '#comment-', \get_comment_link( $comment ) );
|
|
$comment_id = $comment_id[0] . '?comment-' . $comment_id[1];
|
|
return $comment_id;
|
|
}
|
|
|
|
/**
|
|
* Determine AP audience of incoming object
|
|
* @param string $object
|
|
* @return string audience
|
|
*/
|
|
function get_audience( $object ) {
|
|
if ( in_array( AS_PUBLIC, $object['to'] ) ) {
|
|
return 'public';
|
|
}
|
|
if ( in_array( AS_PUBLIC, $object['cc'] ) ) {
|
|
return 'unlisted';//is unlisted even relevant?
|
|
}
|
|
if ( !in_array( AS_PUBLIC, $object['to'] ) && !in_array( AS_PUBLIC, $object['cc'] ) ) {
|
|
$author_post_url = get_author_posts_url( $object['user_id'] );
|
|
if ( in_array( $author_post_url, $object['cc'] ) ) {
|
|
return 'followers_only';
|
|
}
|
|
if ( in_array( $author_post_url, $object['to'] ) ) {
|
|
return 'private';
|
|
}
|
|
}
|
|
}
|