BP_Core_oEmbed_Extension
API for responding and returning a custom oEmbed request.
Description
Source
File: bp-core/classes/class-bp-core-oembed-extension.php
abstract class BP_Core_oEmbed_Extension { /** START PROPERTIES ****************************************************/ /** * (required) The slug endpoint. * * Should be your component id. * * @since BuddyPress 2.6.0 * * @var string */ public $slug_endpoint = ''; /** END PROPERTIES ******************************************************/ /** * Constructor. */ final public function __construct() { $this->setup_properties(); // Some rudimentary logic checking. if ( empty( $this->slug_endpoint ) ) { return; } $this->setup_hooks(); $this->custom_hooks(); } /** REQUIRED METHODS ****************************************************/ /** * Add content for your oEmbed response here. * * @since BuddyPress 2.6.0 * * @return null */ abstract protected function content(); /** * Add a check for when you are on the page you want to oEmbed. * * You'll want to return a boolean here. eg. bp_is_single_activity(). * * @since BuddyPress 2.6.0 * * @return bool */ abstract protected function is_page(); /** * Validate the URL to see if it matches your item ID. * * @since BuddyPress 2.6.0 * * @param string $url URL to validate. * @return int Your item ID */ abstract protected function validate_url_to_item_id( $url ); /** * Set the oEmbed response data. * * @since BuddyPress 2.6.0 * * @param int $item_id Your item ID to do checks against. * @return array Should contain 'content', 'title', 'author_url', 'author_name' as array * keys. 'author_url' and 'author_name' is optional; the rest are required. */ abstract protected function set_oembed_response_data( $item_id ); /** * Sets the fallback HTML for the oEmbed response. * * In a WordPress oEmbed item, the fallback HTML is a <blockquote>. This is * usually hidden after the <iframe> is loaded. * * @since BuddyPress 2.6.0 * * @param int $item_id Your item ID to do checks against. * @return string Fallback HTML you want to output. */ abstract protected function set_fallback_html( $item_id ); /** OPTIONAL METHODS ****************************************************/ /** * If your oEmbed endpoint requires additional arguments, set them here. * * @see register_rest_route() View the $args parameter for more info. * * @since BuddyPress 2.6.0 * * @return array */ protected function set_route_args() { return array(); } /** * Set the iframe title. * * If not set, this will fallback to WP's 'Embedded WordPress Post'. * * @since BuddyPress 2.6.0 * * @param int $item_id The item ID to do checks for. */ protected function set_iframe_title( $item_id ) {} /** * Do what you need to do here to initialize any custom hooks. * * @since BuddyPress 2.6.0 */ protected function custom_hooks() {} /** * Set permalink for oEmbed link discovery. * * This method will be called on the page we want to oEmbed. In most cases, * you will not need to override this method. However, if you need to, do * override in your extended class. * * @since BuddyPress 2.6.0 */ protected function set_permalink() { $url = bp_get_requested_url(); // Remove querystring from bp_get_requested_url(). if ( false !== strpos( bp_get_requested_url(), '?' ) ) { $url = substr( bp_get_requested_url(), 0, strpos( bp_get_requested_url(), '?' ) ); } return $url; } /** HELPERS *************************************************************/ /** * Get the item ID when filtering the oEmbed HTML. * * Should only be used during the 'embed_html' hook. * * @since BuddyPress 2.6.0 */ protected function get_item_id() { return $this->is_page() ? $this->validate_url_to_item_id( $this->set_permalink() ) : buddypress()->{$this->slug_endpoint}->embedid_in_progress; } /** SET UP **************************************************************/ /** * Set up properties. * * @since BuddyPress 2.6.0 */ protected function setup_properties() { $this->slug_endpoint = sanitize_title( $this->slug_endpoint ); } /** * Hooks! We do the dirty work here, so you don't have to! :) * * More hooks are available in the setup_template_parts() method. * * @since BuddyPress 2.6.0 */ protected function setup_hooks() { add_action( 'rest_api_init', array( $this, 'register_route' ) ); add_action( 'bp_embed_content', array( $this, 'inject_content' ) ); add_filter( 'embed_template', array( $this, 'setup_template_parts' ) ); add_filter( 'post_embed_url', array( $this, 'filter_embed_url' ) ); add_filter( 'embed_html', array( $this, 'filter_embed_html' ) ); add_filter( 'oembed_discovery_links', array( $this, 'add_oembed_discovery_links' ) ); add_filter( 'rest_pre_serve_request', array( $this, 'oembed_xml_request' ), 20, 4 ); } /** HOOKS ***************************************************************/ /** * Register the oEmbed REST API route. * * @since BuddyPress 2.6.0 */ public function register_route() { /** This filter is documented in wp-includes/class-wp-oembed-controller.php */ $maxwidth = apply_filters( 'oembed_default_width', 600 ); // Required arguments. $args = array( 'url' => array( 'required' => true, 'sanitize_callback' => 'esc_url_raw', ), 'format' => array( 'default' => 'json', 'sanitize_callback' => 'wp_oembed_ensure_format', ), 'maxwidth' => array( 'default' => $maxwidth, 'sanitize_callback' => 'absint', ) ); // Merge custom arguments here. $args = $args + (array) $this->set_route_args(); register_rest_route( 'oembed/1.0', "/embed/{$this->slug_endpoint}", array( array( 'methods' => WP_REST_Server::READABLE, 'callback' => array( $this, 'get_item' ), 'args' => $args ), ) ); } /** * Set up custom embed template parts for BuddyPress use. * * @since BuddyPress 2.6.0 * * @param string $template File path to current embed template. * @return string */ public function setup_template_parts( $template ) { // Determine if we're on our BP page. if ( ! $this->is_page() || is_404() ) { return $template; } // Set up some BP-specific embed template overrides. add_action( 'get_template_part_embed', array( $this, 'content_buffer_start' ), -999, 2 ); add_action( 'get_footer', array( $this, 'content_buffer_end' ), -999 ); // Return the original WP embed template. return $template; } /** * Start object buffer. * * We're going to override WP's get_template_part( 'embed, 'content' ) call * and inject our own template for BuddyPress use. * * @since BuddyPress 2.6.0 * * @param string $slug Template slug. * @param string $name Template name. */ public function content_buffer_start( $slug, $name ) { if ( 'embed' !== $slug || 'content' !== $name ) { return; } // Start the buffer to wipe out get_template_part( 'embed, 'content' ). ob_start(); } /** * End object buffer. * * We're going to override WP's get_template_part( 'embed, 'content' ) call * and inject our own template for BuddyPress use. * * @since BuddyPress 2.6.0 * * @param string $name Template name. */ public function content_buffer_end( $name ) { if ( 'embed' !== $name || is_404() ) { return; } // Wipe out get_template_part( 'embed, 'content' ). ob_end_clean(); // Start our custom BuddyPress embed template! echo '<div '; post_class( 'wp-embed' ); echo '>'; // Template part for our embed header. bp_get_asset_template_part( 'embeds/header', bp_current_component() ); /** * Inject BuddyPress embed content on this hook. * * You shouldn't really need to use this if you extend the * {@link BP_oEmbed_Component} class. * * @since BuddyPress 2.6.0 */ do_action( 'bp_embed_content' ); // Template part for our embed footer. bp_get_asset_template_part( 'embeds/footer', bp_current_component() ); echo '</div>'; } /** * Adds oEmbed discovery links on single activity pages. * * @since BuddyPress 2.6.0 * * @param string $retval Current discovery links. * @return string */ public function add_oembed_discovery_links( $retval ) { if ( ! $this->is_page() ) { return $retval; } $permalink = $this->set_permalink(); if ( empty( $permalink ) ) { return $retval; } add_filter( 'rest_url' , array( $this, 'filter_rest_url' ) ); $retval = '<link rel="alternate" type="application/json+oembed" href="' . esc_url( get_oembed_endpoint_url( $permalink ) ) . '" />' . "\n"; if ( class_exists( 'SimpleXMLElement' ) ) { $retval .= '<link rel="alternate" type="text/xml+oembed" href="' . esc_url( get_oembed_endpoint_url( $permalink, 'xml' ) ) . '" />' . "\n"; } remove_filter( 'rest_url' , array( $this, 'filter_rest_url' ) ); return $retval; } /** * Fetch our oEmbed response data to return. * * A simplified version of {@link get_oembed_response_data()}. * * @since BuddyPress 2.6.0 * * @link http://oembed.com/ View the 'Response parameters' section for more details. * * @param array $item Custom oEmbed response data. * @param int $width The requested width. * @return array */ protected function get_oembed_response_data( $item, $width ) { $data = wp_parse_args( $item, array( 'version' => '1.0', 'provider_name' => get_bloginfo( 'name' ), 'provider_url' => get_home_url(), 'author_name' => get_bloginfo( 'name' ), 'author_url' => get_home_url(), 'title' => ucfirst( $this->slug_endpoint ), 'type' => 'rich', ) ); /** This filter is documented in /wp-includes/embed.php */ $min_max_width = apply_filters( 'oembed_min_max_width', array( 'min' => 200, 'max' => 600 ) ); $width = min( max( $min_max_width['min'], $width ), $min_max_width['max'] ); $height = max( ceil( $width / 16 * 9 ), 200 ); $data['width'] = absint( $width ); $data['height'] = absint( $height ); // Set 'html' parameter. if ( 'video' === $data['type'] || 'rich' === $data['type'] ) { // Fake a WP post so we can use get_post_embed_html(). $post = new stdClass; $post->post_content = $data['content']; $post->post_title = $data['title']; $data['html'] = get_post_embed_html( $data['width'], $data['height'], $post ); } // Remove temporary parameters. unset( $data['content'] ); return $data; } /** * Callback for the API endpoint. * * Returns the JSON object for the item. * * @since BuddyPress 2.6.0 * * @param WP_REST_Request $request Full data about the request. * @return WP_Error|array oEmbed response data or WP_Error on failure. */ public function get_item( $request ) { $url = $request['url']; $data = false; $item_id = (int) $this->validate_url_to_item_id( $url ); if ( ! empty( $item_id ) ) { // Add markers to tell that we're embedding a single activity. // This is needed for various oEmbed response data filtering. if ( empty( buddypress()->{$this->slug_endpoint} ) ) { buddypress()->{$this->slug_endpoint} = new stdClass; } buddypress()->{$this->slug_endpoint}->embedurl_in_progress = $url; buddypress()->{$this->slug_endpoint}->embedid_in_progress = $item_id; // Save custom route args as well. $custom_args = array_keys( (array) $this->set_route_args() ); if ( ! empty( $custom_args ) ) { buddypress()->{$this->slug_endpoint}->embedargs_in_progress = array(); foreach( $custom_args as $arg ) { if ( isset( $request[ $arg ] ) ) { buddypress()->{$this->slug_endpoint}->embedargs_in_progress[ $arg ] = $request[ $arg ]; } } } // Grab custom oEmbed response data. $item = $this->set_oembed_response_data( $item_id ); // Set oEmbed response data. $data = $this->get_oembed_response_data( $item, $request['maxwidth'] ); } if ( ! $data ) { return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) ); } return $data; } /** * If oEmbed request wants XML, return XML instead of JSON. * * Basically a copy of {@link _oembed_rest_pre_serve_request()}. Unfortunate * that we have to duplicate this just for a URL check. * * @since BuddyPress 2.6.0 * * @param bool $served Whether the request has already been served. * @param WP_HTTP_ResponseInterface $result Result to send to the client. Usually a WP_REST_Response. * @param WP_REST_Request $request Request used to generate the response. * @param WP_REST_Server $server Server instance. * @return bool */ public function oembed_xml_request( $served, $result, $request, $server ) { $params = $request->get_params(); if ( ! isset( $params['format'] ) || 'xml' !== $params['format'] ) { return $served; } // Validate URL against our oEmbed endpoint. If not valid, bail. // This is our mod to _oembed_rest_pre_serve_request(). $query_params = $request->get_query_params(); if ( false === $this->validate_url_to_item_id( $query_params['url'] ) ) { return $served; } // Embed links inside the request. $data = $server->response_to_data( $result, false ); if ( ! class_exists( 'SimpleXMLElement' ) ) { status_header( 501 ); die( get_status_header_desc( 501 ) ); } $result = _oembed_create_xml( $data ); // Bail if there's no XML. if ( ! $result ) { status_header( 501 ); return get_status_header_desc( 501 ); } if ( ! headers_sent() ) { $server->send_header( 'Content-Type', 'text/xml; charset=' . get_option( 'blog_charset' ) ); } echo $result; return true; } /** * Pass our BuddyBoss activity permalink for embedding. * * @since BuddyPress 2.6.0 * * @see bp_activity_embed_rest_route_callback() * * @param string $retval Current embed URL. * @return string */ public function filter_embed_url( $retval ) { if ( false === isset( buddypress()->{$this->slug_endpoint}->embedurl_in_progress ) && ! $this->is_page() ) { return $retval; } $url = $this->is_page() ? $this->set_permalink() : buddypress()->{$this->slug_endpoint}->embedurl_in_progress; $url = trailingslashit( $url ); // This is for the 'WordPress Embed' block // @see bp_activity_embed_comments_button(). if ( 'the_permalink' !== current_filter() ) { $url = add_query_arg( 'embed', 'true', trailingslashit( $url ) ); // Add custom route args to iframe. if ( ! empty( buddypress()->{$this->slug_endpoint}->embedargs_in_progress ) ) { foreach( buddypress()->{$this->slug_endpoint}->embedargs_in_progress as $key => $value ) { $url = add_query_arg( $key, $value, $url ); } } } return $url; } /** * Filters the embed HTML for our BP oEmbed endpoint. * * @since BuddyPress 2.6.0 * * @param string $retval Current embed HTML. * @return string */ public function filter_embed_html( $retval ) { if ( false === isset( buddypress()->{$this->slug_endpoint}->embedurl_in_progress ) && ! $this->is_page() ) { return $retval; } $url = $this->set_permalink(); $item_id = $this->is_page() ? $this->validate_url_to_item_id( $url ) : buddypress()->{$this->slug_endpoint}->embedid_in_progress; // Change 'Embedded WordPress Post' to custom title. $custom_title = $this->set_iframe_title( $item_id ); if ( ! empty( $custom_title ) ) { $title_pos = strpos( $retval, 'title=' ) + 7; $title_end_pos = strpos( $retval, '"', $title_pos ); $retval = substr_replace( $retval, esc_attr( $custom_title ), $title_pos, $title_end_pos - $title_pos ); } // Add 'max-width' CSS attribute to IFRAME. // This will make our oEmbeds responsive. if ( false === strpos( $retval, 'style="max-width' ) ) { $retval = str_replace( '<iframe', '<iframe style="max-width:100%"', $retval ); } // Remove default <blockquote>. $retval = substr( $retval, strpos( $retval, '</blockquote>' ) + 13 ); // Set up new fallback HTML // @todo Maybe use KSES? $fallback_html = $this->set_fallback_html( $item_id ); /** * Dynamic filter to return BP oEmbed HTML. * * @since BuddyPress 2.6.0 * * @var string $retval */ return apply_filters( "bp_{$this->slug_endpoint}_embed_html", $fallback_html . $retval ); } /** * Append our custom slug endpoint to oEmbed endpoint URL. * * Meant to be used as a filter on 'rest_url' before any call to * {@link get_oembed_endpoint_url()} is used. * * @since BuddyPress 2.6.0 * * @see add_oembed_discovery_links() * * @param string $retval Current oEmbed endpoint URL. * @return string */ public function filter_rest_url( $retval = '' ) { return $retval . "/{$this->slug_endpoint}"; } /** * Inject content into the embed template. * * @since BuddyPress 2.6.0 */ public function inject_content() { if ( ! $this->is_page() ) { return; } $this->content(); } }
Changelog
Version | Description |
---|---|
BuddyPress 2.6.0 | Introduced. |
Methods
- __construct — Constructor.
- add_oembed_discovery_links — Adds oEmbed discovery links on single activity pages.
- content — Add content for your oEmbed response here.
- content_buffer_end — End object buffer.
- content_buffer_start — Start object buffer.
- custom_hooks — Do what you need to do here to initialize any custom hooks.
- filter_embed_html — Filters the embed HTML for our BP oEmbed endpoint.
- filter_embed_url — Pass our BuddyBoss activity permalink for embedding.
- filter_rest_url — Append our custom slug endpoint to oEmbed endpoint URL.
- get_item — Callback for the API endpoint.
- get_item_id — Get the item ID when filtering the oEmbed HTML.
- get_oembed_response_data — Fetch our oEmbed response data to return.
- inject_content — Inject content into the embed template.
- is_page — Add a check for when you are on the page you want to oEmbed.
- oembed_xml_request — If oEmbed request wants XML, return XML instead of JSON.
- register_route — Register the oEmbed REST API route.
- set_fallback_html — Sets the fallback HTML for the oEmbed response.
- set_iframe_title — Set the iframe title.
- set_oembed_response_data — Set the oEmbed response data.
- set_permalink — Set permalink for oEmbed link discovery.
- set_route_args — If your oEmbed endpoint requires additional arguments, set them here.
- setup_hooks — Hooks! We do the dirty work here, so you don't have to! :)
- setup_properties — Set up properties.
- setup_template_parts — Set up custom embed template parts for BuddyPress use.
- validate_url_to_item_id — Validate the URL to see if it matches your item ID.
Questions?
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