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<?php |
| 2 |
/** |
| 3 |
* Router class. |
| 4 |
* |
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* @package Activitypub |
| 6 |
*/ |
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|
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namespace Activitypub; |
| 9 |
|
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use Activitypub\Collection\Actors; |
| 11 |
use Activitypub\Collection\Outbox; |
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|
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/** |
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* Router class. |
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*/ |
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class Router { |
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/** |
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* Initialize the class, registering WordPress hooks. |
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*/ |
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public static function init() { |
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\add_action( 'init', array( self::class, 'add_rewrite_rules' ), 11 ); |
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|
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\add_action( 'send_headers', array( self::class, 'add_headers' ) ); |
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\add_filter( 'template_include', array( self::class, 'render_activitypub_template' ), 99 ); |
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\add_action( 'template_redirect', array( self::class, 'template_redirect' ) ); |
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\add_filter( 'redirect_canonical', array( self::class, 'redirect_canonical' ), 10, 2 ); |
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\add_filter( 'redirect_canonical', array( self::class, 'no_trailing_redirect' ), 10, 2 ); |
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\add_filter( 'query_vars', array( self::class, 'add_query_vars' ) ); |
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|
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\add_action( 'parse_query', array( self::class, 'fix_is_home_check' ) ); |
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} |
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|
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/** |
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* Add rewrite rules. |
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*/ |
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public static function add_rewrite_rules() { |
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/* |
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* If another system needs to take precedence over the ActivityPub rewrite rules, |
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* they can define their own and will manually call the appropriate functions as required. |
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*/ |
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if ( ACTIVITYPUB_DISABLE_REWRITES ) { |
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return; |
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} |
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|
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\add_rewrite_rule( |
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'^authorize_interaction/?$', |
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'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/interactions', |
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'top' |
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); |
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|
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if ( ! \class_exists( 'Webfinger' ) ) { |
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\add_rewrite_rule( |
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'^.well-known/webfinger', |
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'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/webfinger', |
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'top' |
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); |
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} |
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|
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if ( ! \class_exists( 'Nodeinfo_Endpoint' ) && true === (bool) \get_option( 'blog_public', 1 ) ) { |
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\add_rewrite_rule( |
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'^.well-known/nodeinfo', |
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'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/nodeinfo', |
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'top' |
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); |
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} |
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|
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// Authorization Server Metadata (RFC 8414). |
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\add_rewrite_rule( |
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'^.well-known/oauth-authorization-server', |
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'index.php?rest_route=/' . ACTIVITYPUB_REST_NAMESPACE . '/oauth/authorization-server-metadata', |
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'top' |
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); |
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|
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\add_rewrite_rule( '^@([\w\-\.]+)\/?$', 'index.php?actor=$matches[1]', 'top' ); |
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\add_rewrite_endpoint( 'activitypub', EP_AUTHORS | EP_PERMALINK | EP_PAGES ); |
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} |
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|
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/** |
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* Return a AS2 JSON version of an author, post or page. |
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* |
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* @param string $template The path to the template object. |
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* |
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* @return string The new path to the JSON template. |
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*/ |
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public static function render_activitypub_template( $template ) { |
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if ( \wp_is_serving_rest_request() || \wp_doing_ajax() ) { |
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return $template; |
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} |
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|
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if ( ! is_activitypub_request() || ! should_negotiate_content() ) { |
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$is_outbox_item = \get_query_var( 'p' ) && Outbox::POST_TYPE === \get_post_type( \get_query_var( 'p' ) ); |
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$is_preflight = isset( $_SERVER['REQUEST_METHOD'] ) && 'OPTIONS' === $_SERVER['REQUEST_METHOD']; |
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|
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if ( $is_outbox_item && $is_preflight ) { |
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/* |
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* CORS preflight: override WordPress 404 so the browser |
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* accepts the preflight response (must be 2xx). |
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*/ |
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\status_header( 200 ); |
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} elseif ( $is_outbox_item ) { |
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// Return 406 for non-ActivityPub requests to outbox items since they only support ActivityPub requests. |
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\set_query_var( 'is_404', true ); |
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\status_header( 406 ); |
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} |
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|
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return $template; |
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} |
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|
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$activitypub_object = Query::get_instance()->get_activitypub_object(); |
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|
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if ( Tombstone::exists_local( Query::get_instance()->get_request_url() ) ) { |
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// Set 410 Gone for permanently deleted posts, 200 OK for soft-deleted. |
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if ( ! $activitypub_object ) { |
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\status_header( 410 ); |
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} |
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|
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return ACTIVITYPUB_PLUGIN_DIR . 'templates/tombstone-json.php'; |
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} |
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|
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$activitypub_template = false; |
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|
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if ( $activitypub_object ) { |
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if ( \get_query_var( 'preview' ) ) { |
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\define( 'ACTIVITYPUB_PREVIEW', true ); |
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|
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/** |
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* Filter the template used for the ActivityPub preview. |
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* |
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* @param string $activitypub_template Absolute path to the template file. |
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*/ |
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$activitypub_template = apply_filters( 'activitypub_preview_template', ACTIVITYPUB_PLUGIN_DIR . '/templates/post-preview.php' ); |
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} else { |
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$activitypub_template = ACTIVITYPUB_PLUGIN_DIR . 'templates/activitypub-json.php'; |
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} |
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} |
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|
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/* |
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* Check if the request is authorized. |
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* |
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* @see https://www.w3.org/wiki/SocialCG/ActivityPub/Primer/Authentication_Authorization#Authorized_fetch |
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* @see https://swicg.github.io/activitypub-http-signature/#authorized-fetch |
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*/ |
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if ( $activitypub_template && use_authorized_fetch() ) { |
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$verification = Signature::verify_http_signature( $_SERVER ); |
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if ( \is_wp_error( $verification ) ) { |
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\status_header( 401 ); |
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|
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// Fallback as template_loader can't return http headers. |
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return $template; |
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} |
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} |
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|
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if ( $activitypub_template ) { |
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\set_query_var( 'is_404', false ); |
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|
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// Check if header already sent. |
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if ( ! \headers_sent() ) { |
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// Send 200 status header. |
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\status_header( 200 ); |
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} |
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|
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return $activitypub_template; |
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} |
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|
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return $template; |
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} |
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|
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/** |
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* Add the 'self' link to the header. |
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*/ |
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public static function add_headers() { |
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$id = Query::get_instance()->get_activitypub_object_id(); |
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|
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/* |
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* Send CORS headers for resolved ActivityPub objects and outbox |
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* items. Outbox items need CORS even when the object ID doesn't |
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* resolve, because browser preflight requests don't carry the |
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* Authorization header needed to authenticate private items. |
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*/ |
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$post_id = \get_query_var( 'p' ); |
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$is_outbox_url = $post_id && Outbox::POST_TYPE === \get_post_type( $post_id ); |
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|
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if ( ! \headers_sent() && ( $id || $is_outbox_url ) ) { |
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\header( 'Access-Control-Allow-Origin: *' ); |
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\header( 'Access-Control-Allow-Methods: GET, OPTIONS' ); |
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\header( 'Access-Control-Allow-Headers: Accept, Authorization, Content-Type' ); |
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} |
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|
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if ( ! $id ) { |
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return; |
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} |
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|
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if ( ! \headers_sent() ) { |
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\header( 'Link: <' . esc_url( $id ) . '>; title="ActivityPub (JSON)"; rel="alternate"; type="application/activity+json"', false ); |
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|
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if ( \get_option( 'activitypub_vary_header', '1' ) ) { |
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// Send Vary header for Accept header. |
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\header( 'Vary: Accept', false ); |
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} |
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} |
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|
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\add_action( |
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'wp_head', |
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static function () use ( $id ) { |
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echo PHP_EOL . '<link rel="alternate" title="ActivityPub (JSON)" type="application/activity+json" href="' . esc_url( $id ) . '" />' . PHP_EOL; |
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} |
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); |
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} |
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|
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/** |
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* Remove trailing slash from ActivityPub @username requests. |
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* |
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* @param string $redirect_url The URL to redirect to. |
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* @param string $requested_url The requested URL. |
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* |
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* @return string $redirect_url The possibly-unslashed redirect URL. |
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*/ |
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public static function no_trailing_redirect( $redirect_url, $requested_url ) { |
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if ( get_query_var( 'actor' ) ) { |
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return $requested_url; |
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} |
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|
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return $redirect_url; |
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} |
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|
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/** |
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* Add support for `p` and `author` query vars. |
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* |
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* @param string $redirect_url The URL to redirect to. |
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* @param string $requested_url The requested URL. |
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* |
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* @return string $redirect_url |
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*/ |
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public static function redirect_canonical( $redirect_url, $requested_url ) { |
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if ( ! is_activitypub_request() ) { |
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return $redirect_url; |
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} |
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|
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$query = \wp_parse_url( $requested_url, PHP_URL_QUERY ); |
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|
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if ( ! $query ) { |
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return $redirect_url; |
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} |
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|
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$query_params = \wp_parse_args( $query ); |
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unset( $query_params['activitypub'] ); |
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unset( $query_params['stamp'] ); |
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|
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if ( 1 !== count( $query_params ) ) { |
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return $redirect_url; |
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} |
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|
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if ( isset( $query_params['p'] ) ) { |
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return null; |
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} |
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|
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if ( isset( $query_params['author'] ) ) { |
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return null; |
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} |
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|
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return $requested_url; |
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} |
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|
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/** |
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* Custom redirects for ActivityPub requests. |
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* |
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* @return void |
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*/ |
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public static function template_redirect() { |
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global $wp_query; |
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|
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$comment_id = \get_query_var( 'c', null ); |
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|
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// Check if it seems to be a comment. |
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if ( $comment_id ) { |
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$comment = \get_comment( $comment_id ); |
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|
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// Load a 404-page if `c` is set but not valid. |
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if ( ! $comment ) { |
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$wp_query->set_404(); |
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return; |
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} |
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|
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// Stop if it's not an ActivityPub comment. |
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if ( is_activitypub_request() && ! is_local_comment( $comment ) ) { |
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return; |
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} |
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|
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\wp_safe_redirect( get_comment_link( $comment ) ); |
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exit; |
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} |
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|
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$actor = \get_query_var( 'actor', null ); |
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if ( $actor ) { |
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$actor = Actors::get_by_username( $actor ); |
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if ( ! $actor || \is_wp_error( $actor ) ) { |
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$wp_query->set_404(); |
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return; |
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} |
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|
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if ( is_activitypub_request() ) { |
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return; |
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} |
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|
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\wp_safe_redirect( $actor->get_url(), 301 ); |
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exit; |
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} |
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|
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$term_id = \get_query_var( 'term_id', null ); |
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if ( $term_id ) { |
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$term = \get_term( $term_id ); |
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|
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// Load a 404-page if `term_id` is set but not valid. |
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if ( ! $term || \is_wp_error( $term ) ) { |
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$wp_query->set_404(); |
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return; |
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} |
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|
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/** |
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* Filters the taxonomies supported for term redirects. |
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* |
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* @since 7.8.3 |
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* |
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* @param array $supported_taxonomies Array of taxonomy names. Default array( 'category', 'post_tag' ). |
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*/ |
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$supported_taxonomies = \apply_filters( 'activitypub_supported_taxonomies', array( 'category', 'post_tag' ) ); |
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|
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if ( ! in_array( $term->taxonomy, $supported_taxonomies, true ) ) { |
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return; |
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} |
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|
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// Don't redirect for ActivityPub requests. |
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if ( is_activitypub_request() ) { |
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return; |
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} |
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|
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$term_link = \get_term_link( $term ); |
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if ( ! \is_wp_error( $term_link ) ) { |
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\wp_safe_redirect( $term_link, 301 ); |
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exit; |
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} |
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} |
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} |
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|
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/** |
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* Add the 'activitypub' query variable so WordPress won't mangle it. |
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* |
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* @param array $vars The query variables. |
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* |
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* @return array The query variables. |
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*/ |
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public static function add_query_vars( $vars ) { |
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$vars[] = 'activitypub'; |
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$vars[] = 'preview'; |
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$vars[] = 'author'; |
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$vars[] = 'actor'; |
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$vars[] = 'stamp'; |
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$vars[] = 'type'; |
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$vars[] = 'c'; |
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$vars[] = 'p'; |
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$vars[] = 'term_id'; |
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|
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return $vars; |
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} |
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|
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/** |
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* Optimize home page query for ActivityPub requests. |
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* |
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* Skip the database query entirely for ActivityPub requests on the home page |
| 370 |
* since we only need to return the blog actor, not posts. |
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* |
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* @param \WP_Query $wp_query The WP_Query instance. |
| 373 |
*/ |
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public static function fix_is_home_check( $wp_query ) { |
| 375 |
if ( |
| 376 |
$wp_query->get( 'actor' ) || |
| 377 |
$wp_query->get( 'stamp' ) || |
| 378 |
$wp_query->get( 'c' ) |
| 379 |
) { |
| 380 |
$wp_query->is_home = false; |
| 381 |
} |
| 382 |
} |
| 383 |
} |
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|
