337 lines
8.6 KiB
PHP
337 lines
8.6 KiB
PHP
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<?php
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namespace Activitypub;
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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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'value' => 'schema:value',
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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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$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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'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 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( 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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// 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 $user->ID;
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}
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}
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return 0;
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}
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/**
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* Get the blacklist from the WordPress options table
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*
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* @return array the list of blacklisted hosts
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*
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* @uses apply_filters() Calls 'activitypub_blacklist' filter
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*/
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function get_blacklist() {
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$blacklist = \get_option( 'activitypub_blacklist' );
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$blacklist_hosts = \explode( PHP_EOL, $blacklist );
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// if no values have been set, revert to the defaults
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if ( ! $blacklist || ! $blacklist_hosts || ! \is_array( $blacklist_hosts ) ) {
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$blacklist_hosts = array(
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'gab.com',
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);
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}
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// clean out any blank values
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foreach ( $blacklist_hosts as $key => $value ) {
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if ( empty( $value ) ) {
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unset( $blacklist_hosts[ $key ] );
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} else {
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$blacklist_hosts[ $key ] = \trim( $blacklist_hosts[ $key ] );
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}
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}
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return \apply_filters( 'activitypub_blacklist', $blacklist_hosts );
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}
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/**
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* Check if an URL is blacklisted
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*
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* @param string $url an URL to check
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*
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* @return boolean
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*/
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function is_blacklisted( $url ) {
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foreach ( \ActivityPub\get_blacklist() as $blacklisted_host ) {
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if ( \strpos( $url, $blacklisted_host ) !== false ) {
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return true;
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}
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}
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return false;
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}
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