<?php namespace Activitypub; /** * Returns the ActivityPub default JSON-context * * @return array the activitypub context */ function get_context() { $context = array( 'https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1', array( 'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers', 'PropertyValue' => 'schema:PropertyValue', 'schema' => 'http://schema.org#', 'value' => 'schema:value', ), ); return \apply_filters( 'activitypub_json_context', $context ); } function safe_remote_post( $url, $body, $user_id ) { $date = \gmdate( 'D, d M Y H:i:s T' ); $digest = \Activitypub\Signature::generate_digest( $body ); $signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date, $digest ); $wp_version = \get_bloginfo( 'version' ); $user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) ); $args = array( 'timeout' => 100, 'limit_response_size' => 1048576, 'redirection' => 3, 'user-agent' => "$user_agent; ActivityPub", 'headers' => array( 'Accept' => 'application/activity+json', 'Content-Type' => 'application/activity+json', 'Digest' => "SHA-256=$digest", 'Signature' => $signature, 'Date' => $date, ), 'body' => $body, ); $response = \wp_safe_remote_post( $url, $args ); \do_action( 'activitypub_safe_remote_post_response', $response, $url, $body, $user_id ); return $response; } function safe_remote_get( $url, $user_id ) { $date = \gmdate( 'D, d M Y H:i:s T' ); $signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date ); $wp_version = \get_bloginfo( 'version' ); $user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) ); $args = array( 'timeout' => 100, 'limit_response_size' => 1048576, 'redirection' => 3, 'user-agent' => "$user_agent; ActivityPub", 'headers' => array( 'Accept' => 'application/activity+json', 'Content-Type' => 'application/activity+json', 'Signature' => $signature, 'Date' => $date, ), ); $response = \wp_safe_remote_get( $url, $args ); \do_action( 'activitypub_safe_remote_get_response', $response, $url, $user_id ); return $response; } /** * Returns a users WebFinger "resource" * * @param int $user_id * * @return string The user-resource */ function get_webfinger_resource( $user_id ) { // use WebFinger plugin if installed if ( \function_exists( '\get_webfinger_resource' ) ) { return \get_webfinger_resource( $user_id, false ); } $user = \get_user_by( 'id', $user_id ); return $user->user_login . '@' . \wp_parse_url( \home_url(), \PHP_URL_HOST ); } /** * [get_metadata_by_actor description] * * @param sting $actor * * @return array */ function get_remote_metadata_by_actor( $actor ) { $metadata = \get_transient( 'activitypub_' . $actor ); if ( $metadata ) { return $metadata; } if ( ! \wp_http_validate_url( $actor ) ) { return new \WP_Error( 'activitypub_no_valid_actor_url', \__( 'The "actor" is no valid URL', 'activitypub' ), $actor ); } $user = \get_users( array ( 'number' => 1, 'who' => 'authors', 'fields' => 'ID', ) ); // we just need any user to generate a request signature $user_id = \reset( $user ); $response = \Activitypub\safe_remote_get( $actor, $user_id ); if ( \is_wp_error( $response ) ) { return $response; } $metadata = \wp_remote_retrieve_body( $response ); $metadata = \json_decode( $metadata, true ); if ( ! $metadata ) { return new \WP_Error( 'activitypub_invalid_json', \__( 'No valid JSON data', 'activitypub' ), $actor ); } \set_transient( 'activitypub_' . $actor, $metadata, WEEK_IN_SECONDS ); return $metadata; } /** * [get_inbox_by_actor description] * @param [type] $actor [description] * @return [type] [description] */ function get_inbox_by_actor( $actor ) { $metadata = \Activitypub\get_remote_metadata_by_actor( $actor ); if ( \is_wp_error( $metadata ) ) { return $metadata; } if ( isset( $metadata['endpoints'] ) && isset( $metadata['endpoints']['sharedInbox'] ) ) { return $metadata['endpoints']['sharedInbox']; } if ( \array_key_exists( 'inbox', $metadata ) ) { return $metadata['inbox']; } return new \WP_Error( 'activitypub_no_inbox', \__( 'No "Inbox" found', 'activitypub' ), $metadata ); } /** * [get_inbox_by_actor description] * @param [type] $actor [description] * @return [type] [description] */ function get_publickey_by_actor( $actor, $key_id ) { $metadata = \Activitypub\get_remote_metadata_by_actor( $actor ); if ( \is_wp_error( $metadata ) ) { return $metadata; } if ( isset( $metadata['publicKey'] ) && isset( $metadata['publicKey']['id'] ) && isset( $metadata['publicKey']['owner'] ) && isset( $metadata['publicKey']['publicKeyPem'] ) && $key_id === $metadata['publicKey']['id'] && $actor === $metadata['publicKey']['owner'] ) { return $metadata['publicKey']['publicKeyPem']; } return new \WP_Error( 'activitypub_no_public_key', \__( 'No "Public-Key" found', 'activitypub' ), $metadata ); } function get_follower_inboxes( $user_id ) { $followers = \Activitypub\Peer\Followers::get_followers( $user_id ); $inboxes = array(); foreach ( $followers as $follower ) { $inbox = \Activitypub\get_inbox_by_actor( $follower ); if ( ! $inbox || \is_wp_error( $inbox ) ) { continue; } // init array if empty if ( ! isset( $inboxes[ $inbox ] ) ) { $inboxes[ $inbox ] = array(); } $inboxes[ $inbox ][] = $follower; } return $inboxes; } function get_identifier_settings( $user_id ) { ?> <table class="form-table"> <tbody> <tr> <th scope="row"> <label><?php \esc_html_e( 'Profile identifier', 'activitypub' ); ?></label> </th> <td> <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> <?php // translators: the webfinger resource ?> <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> </td> </tr> </tbody> </table> <?php } function get_followers( $user_id ) { $followers = \Activitypub\Peer\Followers::get_followers( $user_id ); if ( ! $followers ) { return array(); } return $followers; } function count_followers( $user_id ) { $followers = \Activitypub\get_followers( $user_id ); return \count( $followers ); } /** * 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( \site_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; }