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embed.php
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<?php
/**
* oEmbed API: Top-level oEmbed functionality
*
* @package WordPress
* @subpackage oEmbed
* @since 4.4.0
*/
/**
* Registers an embed handler.
*
* Should probably only be used for sites that do not support oEmbed.
*
* @since 2.9.0
*
* @global WP_Embed $wp_embed
*
* @param string $id An internal ID/name for the handler. Needs to be unique.
* @param string $regex The regex that will be used to see if this handler should be used for a URL.
* @param callable $callback The callback function that will be called if the regex is matched.
* @param int $priority Optional. Used to specify the order in which the registered handlers will
* be tested. Default 10.
*/
function wp_embed_register_handler( $id, $regex, $callback, $priority = 10 ) {
global $wp_embed;
$wp_embed->register_handler( $id, $regex, $callback, $priority );
}
/**
* Unregisters a previously-registered embed handler.
*
* @since 2.9.0
*
* @global WP_Embed $wp_embed
*
* @param string $id The handler ID that should be removed.
* @param int $priority Optional. The priority of the handler to be removed. Default 10.
*/
function wp_embed_unregister_handler( $id, $priority = 10 ) {
global $wp_embed;
$wp_embed->unregister_handler( $id, $priority );
}
/**
* Creates default array of embed parameters.
*
* The width defaults to the content width as specified by the theme. If the
* theme does not specify a content width, then 500px is used.
*
* The default height is 1.5 times the width, or 1000px, whichever is smaller.
*
* The {@see 'embed_defaults'} filter can be used to adjust either of these values.
*
* @since 2.9.0
*
* @global int $content_width
*
* @param string $url Optional. The URL that should be embedded. Default empty.
* @return array {
* Indexed array of the embed width and height in pixels.
*
* @type int $0 The embed width.
* @type int $1 The embed height.
* }
*/
function wp_embed_defaults( $url = '' ) {
if ( ! empty( $GLOBALS['content_width'] ) ) {
$width = (int) $GLOBALS['content_width'];
}
if ( empty( $width ) ) {
$width = 500;
}
$height = min( ceil( $width * 1.5 ), 1000 );
/**
* Filters the default array of embed dimensions.
*
* @since 2.9.0
*
* @param int[] $size {
* Indexed array of the embed width and height in pixels.
*
* @type int $0 The embed width.
* @type int $1 The embed height.
* }
* @param string $url The URL that should be embedded.
*/
return apply_filters( 'embed_defaults', compact( 'width', 'height' ), $url );
}
/**
* Attempts to fetch the embed HTML for a provided URL using oEmbed.
*
* @since 2.9.0
*
* @see WP_oEmbed
*
* @param string $url The URL that should be embedded.
* @param array|string $args {
* Optional. Additional arguments for retrieving embed HTML. Default empty.
*
* @type int|string $width Optional. The `maxwidth` value passed to the provider URL.
* @type int|string $height Optional. The `maxheight` value passed to the provider URL.
* @type bool $discover Optional. Determines whether to attempt to discover link tags
* at the given URL for an oEmbed provider when the provider URL
* is not found in the built-in providers list. Default true.
* }
* @return string|false The embed HTML on success, false on failure.
*/
function wp_oembed_get( $url, $args = '' ) {
$oembed = _wp_oembed_get_object();
return $oembed->get_html( $url, $args );
}
/**
* Returns the initialized WP_oEmbed object.
*
* @since 2.9.0
* @access private
*
* @return WP_oEmbed object.
*/
function _wp_oembed_get_object() {
static $wp_oembed = null;
if ( is_null( $wp_oembed ) ) {
$wp_oembed = new WP_oEmbed();
}
return $wp_oembed;
}
/**
* Adds a URL format and oEmbed provider URL pair.
*
* @since 2.9.0
*
* @see WP_oEmbed
*
* @param string $format The format of URL that this provider can handle. You can use asterisks
* as wildcards.
* @param string $provider The URL to the oEmbed provider.
* @param bool $regex Optional. Whether the `$format` parameter is in a RegEx format. Default false.
*/
function wp_oembed_add_provider( $format, $provider, $regex = false ) {
if ( did_action( 'plugins_loaded' ) ) {
$oembed = _wp_oembed_get_object();
$oembed->providers[ $format ] = array( $provider, $regex );
} else {
WP_oEmbed::_add_provider_early( $format, $provider, $regex );
}
}
/**
* Removes an oEmbed provider.
*
* @since 3.5.0
*
* @see WP_oEmbed
*
* @param string $format The URL format for the oEmbed provider to remove.
* @return bool Was the provider removed successfully?
*/
function wp_oembed_remove_provider( $format ) {
if ( did_action( 'plugins_loaded' ) ) {
$oembed = _wp_oembed_get_object();
if ( isset( $oembed->providers[ $format ] ) ) {
unset( $oembed->providers[ $format ] );
return true;
}
} else {
WP_oEmbed::_remove_provider_early( $format );
}
return false;
}
/**
* Determines if default embed handlers should be loaded.
*
* Checks to make sure that the embeds library hasn't already been loaded. If
* it hasn't, then it will load the embeds library.
*
* @since 2.9.0
*
* @see wp_embed_register_handler()
*/
function wp_maybe_load_embeds() {
/**
* Filters whether to load the default embed handlers.
*
* Returning a falsey value will prevent loading the default embed handlers.
*
* @since 2.9.0
*
* @param bool $maybe_load_embeds Whether to load the embeds library. Default true.
*/
if ( ! apply_filters( 'load_default_embeds', true ) ) {
return;
}
wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' );
/**
* Filters the audio embed handler callback.
*
* @since 3.6.0
*
* @param callable $handler Audio embed handler callback function.
*/
wp_embed_register_handler( 'audio', '#^https?://.+?\.(' . implode( '|', wp_get_audio_extensions() ) . ')$#i', apply_filters( 'wp_audio_embed_handler', 'wp_embed_handler_audio' ), 9999 );
/**
* Filters the video embed handler callback.
*
* @since 3.6.0
*
* @param callable $handler Video embed handler callback function.
*/
wp_embed_register_handler( 'video', '#^https?://.+?\.(' . implode( '|', wp_get_video_extensions() ) . ')$#i', apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' ), 9999 );
}
/**
* YouTube iframe embed handler callback.
*
* Catches YouTube iframe embed URLs that are not parsable by oEmbed but can be translated into a URL that is.
*
* @since 4.0.0
*
* @global WP_Embed $wp_embed
*
* @param array $matches The RegEx matches from the provided regex when calling
* wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_youtube( $matches, $attr, $url, $rawattr ) {
global $wp_embed;
$embed = $wp_embed->autoembed( sprintf( 'https://youtube.com/watch?v=%s', urlencode( $matches[2] ) ) );
/**
* Filters the YoutTube embed output.
*
* @since 4.0.0
*
* @see wp_embed_handler_youtube()
*
* @param string $embed YouTube embed output.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'wp_embed_handler_youtube', $embed, $attr, $url, $rawattr );
}
/**
* Audio embed handler callback.
*
* @since 3.6.0
*
* @param array $matches The RegEx matches from the provided regex when calling wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_audio( $matches, $attr, $url, $rawattr ) {
$audio = sprintf( '[audio src="%s" /]', esc_url( $url ) );
/**
* Filters the audio embed output.
*
* @since 3.6.0
*
* @param string $audio Audio embed output.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'wp_embed_handler_audio', $audio, $attr, $url, $rawattr );
}
/**
* Video embed handler callback.
*
* @since 3.6.0
*
* @param array $matches The RegEx matches from the provided regex when calling wp_embed_register_handler().
* @param array $attr Embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
* @return string The embed HTML.
*/
function wp_embed_handler_video( $matches, $attr, $url, $rawattr ) {
$dimensions = '';
if ( ! empty( $rawattr['width'] ) && ! empty( $rawattr['height'] ) ) {
$dimensions .= sprintf( 'width="%d" ', (int) $rawattr['width'] );
$dimensions .= sprintf( 'height="%d" ', (int) $rawattr['height'] );
}
$video = sprintf( '[video %s src="%s" /]', $dimensions, esc_url( $url ) );
/**
* Filters the video embed output.
*
* @since 3.6.0
*
* @param string $video Video embed output.
* @param array $attr An array of embed attributes.
* @param string $url The original URL that was matched by the regex.
* @param array $rawattr The original unmodified attributes.
*/
return apply_filters( 'wp_embed_handler_video', $video, $attr, $url, $rawattr );
}
/**
* Registers the oEmbed REST API route.
*
* @since 4.4.0
*/
function wp_oembed_register_route() {
$controller = new WP_oEmbed_Controller();
$controller->register_routes();
}
/**
* Adds oEmbed discovery links in the website <head>.
*
* @since 4.4.0
*/
function wp_oembed_add_discovery_links() {
$output = '';
if ( is_singular() ) {
$output .= '<link rel="alternate" type="application/json+oembed" href="' . esc_url( get_oembed_endpoint_url( get_permalink() ) ) . '" />' . "\n";
if ( class_exists( 'SimpleXMLElement' ) ) {
$output .= '<link rel="alternate" type="text/xml+oembed" href="' . esc_url( get_oembed_endpoint_url( get_permalink(), 'xml' ) ) . '" />' . "\n";
}
}
/**
* Filters the oEmbed discovery links HTML.
*
* @since 4.4.0
*
* @param string $output HTML of the discovery links.
*/
echo apply_filters( 'oembed_discovery_links', $output );
}
/**
* Adds the necessary JavaScript to communicate with the embedded iframes.
*
* @since 4.4.0
*/
function wp_oembed_add_host_js() {
wp_enqueue_script( 'wp-embed' );
}
/**
* Retrieves the URL to embed a specific post in an iframe.
*
* @since 4.4.0
*
* @param int|WP_Post $post Optional. Post ID or object. Defaults to the current post.
* @return string|false The post embed URL on success, false if the post doesn't exist.
*/
function get_post_embed_url( $post = null ) {
$post = get_post( $post );
if ( ! $post ) {
return false;
}
$embed_url = trailingslashit( get_permalink( $post ) ) . user_trailingslashit( 'embed' );
$path_conflict = get_page_by_path( str_replace( home_url(), '', $embed_url ), OBJECT, get_post_types( array( 'public' => true ) ) );
if ( ! get_option( 'permalink_structure' ) || $path_conflict ) {
$embed_url = add_query_arg( array( 'embed' => 'true' ), get_permalink( $post ) );
}
/**
* Filters the URL to embed a specific post.
*
* @since 4.4.0
*
* @param string $embed_url The post embed URL.
* @param WP_Post $post The corresponding post object.
*/
return esc_url_raw( apply_filters( 'post_embed_url', $embed_url, $post ) );
}
/**
* Retrieves the oEmbed endpoint URL for a given permalink.
*
* Pass an empty string as the first argument to get the endpoint base URL.
*
* @since 4.4.0
*
* @param string $permalink Optional. The permalink used for the `url` query arg. Default empty.
* @param string $format Optional. The requested response format. Default 'json'.
* @return string The oEmbed endpoint URL.
*/
function get_oembed_endpoint_url( $permalink = '', $format = 'json' ) {
$url = rest_url( 'oembed/1.0/embed' );
if ( '' !== $permalink ) {
$url = add_query_arg(
array(
'url' => urlencode( $permalink ),
'format' => ( 'json' !== $format ) ? $format : false,
),
$url
);
}
/**
* Filters the oEmbed endpoint URL.
*
* @since 4.4.0
*
* @param string $url The URL to the oEmbed endpoint.
* @param string $permalink The permalink used for the `url` query arg.
* @param string $format The requested response format.
*/
return apply_filters( 'oembed_endpoint_url', $url, $permalink, $format );
}
/**
* Retrieves the embed code for a specific post.
*
* @since 4.4.0
*
* @param int $width The width for the response.
* @param int $height The height for the response.
* @param int|WP_Post $post Optional. Post ID or object. Default is global `$post`.
* @return string|false Embed code on success, false if post doesn't exist.
*/
function get_post_embed_html( $width, $height, $post = null ) {
$post = get_post( $post );
if ( ! $post ) {
return false;
}
$embed_url = get_post_embed_url( $post );
$output = '<blockquote class="wp-embedded-content"><a href="' . esc_url( get_permalink( $post ) ) . '">' . get_the_title( $post ) . "</a></blockquote>\n";
$output .= "<script type='text/javascript'>\n";
$output .= "<!--//--><![CDATA[//><!--\n";
if ( SCRIPT_DEBUG ) {
$output .= file_get_contents( ABSPATH . WPINC . '/js/wp-embed.js' );
} else {
/*
* If you're looking at a src version of this file, you'll see an "include"
* statement below. This is used by the `npm run build` process to directly
* include a minified version of wp-embed.js, instead of using the
* file_get_contents() method from above.
*
* If you're looking at a build version of this file, you'll see a string of
* minified JavaScript. If you need to debug it, please turn on SCRIPT_DEBUG
* and edit wp-embed.js directly.
*/
$output .= <<<JS
/*! This file is auto-generated */
!function(c,d){"use strict";var e=!1,n=!1;if(d.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},!c.wp.receiveEmbedMessage)if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(t)if(t.secret||t.message||t.value)if(!/[^a-zA-Z0-9]/.test(t.secret)){for(var r,a,i,s=d.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),n=d.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),o=0;o<n.length;o++)n[o].style.display="none";for(o=0;o<s.length;o++)if(r=s[o],e.source===r.contentWindow){if(r.removeAttribute("style"),"height"===t.message){if(1e3<(i=parseInt(t.value,10)))i=1e3;else if(~~i<200)i=200;r.height=i}if("link"===t.message)if(a=d.createElement("a"),i=d.createElement("a"),a.href=r.getAttribute("src"),i.href=t.value,i.host===a.host)if(d.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener("message",c.wp.receiveEmbedMessage,!1),d.addEventListener("DOMContentLoaded",t,!1),c.addEventListener("load",t,!1);function t(){if(!n){n=!0;for(var e,t,r=-1!==navigator.appVersion.indexOf("MSIE 10"),a=!!navigator.userAgent.match(/Trident.*rv:11\./),i=d.querySelectorAll("iframe.wp-embedded-content"),s=0;s<i.length;s++){if(!(e=i[s]).getAttribute("data-secret"))t=Math.random().toString(36).substr(2,10),e.src+="#?secret="+t,e.setAttribute("data-secret",t);if(r||a)(t=e.cloneNode(!0)).removeAttribute("security"),e.parentNode.replaceChild(t,e)}}}}(window,document);
JS;
}
$output .= "\n//--><!]]>";
$output .= "\n</script>";
$output .= sprintf(
'<iframe sandbox="allow-scripts" security="restricted" src="%1$s" width="%2$d" height="%3$d" title="%4$s" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe>',
esc_url( $embed_url ),
absint( $width ),
absint( $height ),
esc_attr(
sprintf(
/* translators: 1: Post title, 2: Site title. */
__( '“%1$s” — %2$s' ),
get_the_title( $post ),
get_bloginfo( 'name' )
)
)
);
/**
* Filters the embed HTML output for a given post.
*
* @since 4.4.0
*
* @param string $output The default iframe tag to display embedded content.
* @param WP_Post $post Current post object.
* @param int $width Width of the response.
* @param int $height Height of the response.
*/
return apply_filters( 'embed_html', $output, $post, $width, $height );
}
/**
* Retrieves the oEmbed response data for a given post.
*
* @since 4.4.0
*
* @param WP_Post|int $post Post object or ID.
* @param int $width The requested width.
* @return array|false Response data on success, false if post doesn't exist
* or is not publicly viewable.
*/
function get_oembed_response_data( $post, $width ) {
$post = get_post( $post );
$width = absint( $width );
if ( ! $post ) {
return false;
}
if ( ! is_post_publicly_viewable( $post ) ) {
return false;
}
/**
* Filters the allowed minimum and maximum widths for the oEmbed response.
*
* @since 4.4.0
*
* @param array $min_max_width {
* Minimum and maximum widths for the oEmbed response.
*
* @type int $min Minimum width. Default 200.
* @type int $max Maximum width. Default 600.
* }
*/
$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 = 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' => get_the_title( $post ),
'type' => 'link',
);
$author = get_userdata( $post->post_author );
if ( $author ) {
$data['author_name'] = $author->display_name;
$data['author_url'] = get_author_posts_url( $author->ID );
}
/**
* Filters the oEmbed response data.
*
* @since 4.4.0
*
* @param array $data The response data.
* @param WP_Post $post The post object.
* @param int $width The requested width.
* @param int $height The calculated height.
*/
return apply_filters( 'oembed_response_data', $data, $post, $width, $height );
}
/**
* Retrieves the oEmbed response data for a given URL.
*
* @since 5.0.0
*
* @param string $url The URL that should be inspected for discovery `<link>` tags.
* @param array $args oEmbed remote get arguments.
* @return object|false oEmbed response data if the URL does belong to the current site. False otherwise.
*/
function get_oembed_response_data_for_url( $url, $args ) {
$switched_blog = false;
if ( is_multisite() ) {
$url_parts = wp_parse_args(
wp_parse_url( $url ),
array(
'host' => '',
'path' => '/',
)
);
$qv = array(
'domain' => $url_parts['host'],
'path' => '/',
'update_site_meta_cache' => false,
);
// In case of subdirectory configs, set the path.
if ( ! is_subdomain_install() ) {
$path = explode( '/', ltrim( $url_parts['path'], '/' ) );
$path = reset( $path );
if ( $path ) {
$qv['path'] = get_network()->path . $path . '/';
}
}
$sites = get_sites( $qv );
$site = reset( $sites );
// Do not allow embeds for deleted/archived/spam sites.
if ( ! empty( $site->deleted ) || ! empty( $site->spam ) || ! empty( $site->archived ) ) {
return false;
}
if ( $site && get_current_blog_id() !== (int) $site->blog_id ) {
switch_to_blog( $site->blog_id );
$switched_blog = true;
}
}
$post_id = url_to_postid( $url );
/** This filter is documented in wp-includes/class-wp-oembed-controller.php */
$post_id = apply_filters( 'oembed_request_post_id', $post_id, $url );
if ( ! $post_id ) {
if ( $switched_blog ) {
restore_current_blog();
}
return false;
}
$width = isset( $args['width'] ) ? $args['width'] : 0;
$data = get_oembed_response_data( $post_id, $width );
if ( $switched_blog ) {
restore_current_blog();
}
return $data ? (object) $data : false;
}
/**
* Filters the oEmbed response data to return an iframe embed code.
*
* @since 4.4.0
*
* @param array $data The response data.
* @param WP_Post $post The post object.
* @param int $width The requested width.
* @param int $height The calculated height.
* @return array The modified response data.
*/
function get_oembed_response_data_rich( $data, $post, $width, $height ) {
$data['width'] = absint( $width );
$data['height'] = absint( $height );
$data['type'] = 'rich';
$data['html'] = get_post_embed_html( $width, $height, $post );
// Add post thumbnail to response if available.
$thumbnail_id = false;
if ( has_post_thumbnail( $post->ID ) ) {
$thumbnail_id = get_post_thumbnail_id( $post->ID );
}
if ( 'attachment' === get_post_type( $post ) ) {
if ( wp_attachment_is_image( $post ) ) {
$thumbnail_id = $post->ID;
} elseif ( wp_attachment_is( 'video', $post ) ) {
$thumbnail_id = get_post_thumbnail_id( $post );
$data['type'] = 'video';
}
}
if ( $thumbnail_id ) {
list( $thumbnail_url, $thumbnail_width, $thumbnail_height ) = wp_get_attachment_image_src( $thumbnail_id, array( $width, 99999 ) );
$data['thumbnail_url'] = $thumbnail_url;
$data['thumbnail_width'] = $thumbnail_width;
$data['thumbnail_height'] = $thumbnail_height;
}
return $data;
}
/**
* Ensures that the specified format is either 'json' or 'xml'.
*
* @since 4.4.0
*
* @param string $format The oEmbed response format. Accepts 'json' or 'xml'.
* @return string The format, either 'xml' or 'json'. Default 'json'.
*/
function wp_oembed_ensure_format( $format ) {
if ( ! in_array( $format, array( 'json', 'xml' ), true ) ) {
return 'json';
}
return $format;
}
/**
* Hooks into the REST API output to print XML instead of JSON.
*
* This is only done for the oEmbed API endpoint,
* which supports both formats.
*
* @access private
* @since 4.4.0
*
* @param bool $served Whether the request has already been served.
* @param WP_HTTP_Response $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 true
*/
function _oembed_rest_pre_serve_request( $served, $result, $request, $server ) {
$params = $request->get_params();
if ( '/oembed/1.0/embed' !== $request->get_route() || 'GET' !== $request->get_method() ) {
return $served;
}
if ( ! isset( $params['format'] ) || 'xml' !== $params['format'] ) {
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;
}
/**
* Creates an XML string from a given array.
*
* @since 4.4.0
* @access private
*
* @param array $data The original oEmbed response data.
* @param SimpleXMLElement $node Optional. XML node to append the result to recursively.
* @return string|false XML string on success, false on error.
*/
function _oembed_create_xml( $data, $node = null ) {
if ( ! is_array( $data ) || empty( $data ) ) {
return false;
}
if ( null === $node ) {
$node = new SimpleXMLElement( '<oembed></oembed>' );
}
foreach ( $data as $key => $value ) {
if ( is_numeric( $key ) ) {
$key = 'oembed';
}
if ( is_array( $value ) ) {
$item = $node->addChild( $key );
_oembed_create_xml( $value, $item );
} else {
$node->addChild( $key, esc_html( $value ) );
}
}
return $node->asXML();
}
/**
* Filters the given oEmbed HTML to make sure iframes have a title attribute.
*
* @since 5.2.0
*
* @param string $result The oEmbed HTML result.
* @param object $data A data object result from an oEmbed provider.
* @param string $url The URL of the content to be embedded.
* @return string The filtered oEmbed result.
*/
function wp_filter_oembed_iframe_title_attribute( $result, $data, $url ) {
if ( false === $result || ! in_array( $data->type, array( 'rich', 'video' ), true ) ) {
return $result;
}
$title = ! empty( $data->title ) ? $data->title : '';
$pattern = '`<iframe([^>]*)>`i';
if ( preg_match( $pattern, $result, $matches ) ) {
$attrs = wp_kses_hair( $matches[1], wp_allowed_protocols() );
foreach ( $attrs as $attr => $item ) {
$lower_attr = strtolower( $attr );
if ( $lower_attr === $attr ) {
continue;
}
if ( ! isset( $attrs[ $lower_attr ] ) ) {
$attrs[ $lower_attr ] = $item;
unset( $attrs[ $attr ] );
}
}
}
if ( ! empty( $attrs['title']['value'] ) ) {
$title = $attrs['title']['value'];
}
/**
* Filters the title attribute of the given oEmbed HTML iframe.
*
* @since 5.2.0
*
* @param string $title The title attribute.
* @param string $result The oEmbed HTML result.
* @param object $data A data object result from an oEmbed provider.
* @param string $url The URL of the content to be embedded.
*/
$title = apply_filters( 'oembed_iframe_title_attribute', $title, $result, $data, $url );
if ( '' === $title ) {
return $result;
}
if ( isset( $attrs['title'] ) ) {
unset( $attrs['title'] );
$attr_string = implode( ' ', wp_list_pluck( $attrs, 'whole' ) );
$result = str_replace( $matches[0], '<iframe ' . trim( $attr_string ) . '>', $result );
}
return str_ireplace( '<iframe ', sprintf( '<iframe title="%s" ', esc_attr( $title ) ), $result );
}
/**
* Filters the given oEmbed HTML.
*
* If the `$url` isn't on the trusted providers list,
* we need to filter the HTML heavily for security.
*
* Only filters 'rich' and 'video' response types.
*
* @since 4.4.0
*
* @param string $result The oEmbed HTML result.
* @param object $data A data object result from an oEmbed provider.
* @param string $url The URL of the content to be embedded.
* @return string The filtered and sanitized oEmbed result.
*/
function wp_filter_oembed_result( $result, $data, $url ) {
if ( false === $result || ! in_array( $data->type, array( 'rich', 'video' ), true ) ) {
return $result;
}
$wp_oembed = _wp_oembed_get_object();
// Don't modify the HTML for trusted providers.
if ( false !== $wp_oembed->get_provider( $url, array( 'discover' => false ) ) ) {
return $result;
}
$allowed_html = array(
'a' => array(
'href' => true,
),
'blockquote' => array(),
'iframe' => array(
'src' => true,
'width' => true,
'height' => true,
'frameborder' => true,
'marginwidth' => true,
'marginheight' => true,
'scrolling' => true,
'title' => true,
),
);
$html = wp_kses( $result, $allowed_html );
preg_match( '|(<blockquote>.*?</blockquote>)?.*(<iframe.*?></iframe>)|ms', $html, $content );
// We require at least the iframe to exist.
if ( empty( $content[2] ) ) {
return false;
}
$html = $content[1] . $content[2];
preg_match( '/ src=([\'"])(.*?)\1/', $html, $results );
if ( ! empty( $results ) ) {
$secret = wp_generate_password( 10, false );
$url = esc_url( "{$results[2]}#?secret=$secret" );
$q = $results[1];
$html = str_replace( $results[0], ' src=' . $q . $url . $q . ' data-secret=' . $q . $secret . $q, $html );
$html = str_replace( '<blockquote', "<blockquote data-secret=\"$secret\"", $html );
}
$allowed_html['blockquote']['data-secret'] = true;
$allowed_html['iframe']['data-secret'] = true;
$html = wp_kses( $html, $allowed_html );
if ( ! empty( $content[1] ) ) {
// We have a blockquote to fall back on. Hide the iframe by default.
$html = str_replace( '<iframe', '<iframe style="position: absolute; clip: rect(1px, 1px, 1px, 1px);"', $html );
$html = str_replace( '<blockquote', '<blockquote class="wp-embedded-content"', $html );
}
$html = str_ireplace( '<iframe', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $html );
return $html;
}
/**
* Filters the string in the 'more' link displayed after a trimmed excerpt.
*
* Replaces '[...]' (appended to automatically generated excerpts) with an
* ellipsis and a "Continue reading" link in the embed template.
*
* @since 4.4.0
*
* @param string $more_string Default 'more' string.
* @return string 'Continue reading' link prepended with an ellipsis.
*/
function wp_embed_excerpt_more( $more_string ) {
if ( ! is_embed() ) {
return $more_string;
}
$link = sprintf(
'<a href="%1$s" class="wp-embed-more" target="_top">%2$s</a>',
esc_url( get_permalink() ),
/* translators: %s: Post title. */
sprintf( __( 'Continue reading %s' ), '<span class="screen-reader-text">' . get_the_title() . '</span>' )
);
return ' … ' . $link;
}
/**
* Displays the post excerpt for the embed template.
*
* Intended to be used in 'The Loop'.
*
* @since 4.4.0
*/
function the_excerpt_embed() {
$output = get_the_excerpt();
/**
* Filters the post excerpt for the embed template.
*
* @since 4.4.0
*
* @param string $output The current post excerpt.
*/
echo apply_filters( 'the_excerpt_embed', $output );
}
/**
* Filters the post excerpt for the embed template.
*
* Shows players for video and audio attachments.
*
* @since 4.4.0
*
* @param string $content The current post excerpt.
* @return string The modified post excerpt.
*/