/**

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* WordPress inline HTML embed

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*

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* @since 4.4.0

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* @output wp-includes/js/wp-embed.js

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*

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* Single line comments should not be used since they will break

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* the script when inlined in get_post_embed_html(), specifically

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* when the comments are not stripped out due to SCRIPT_DEBUG

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* being turned on.

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*/

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(function ( window, document ) {

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'use strict';

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/* Abort for ancient browsers. */

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if ( ! document.querySelector || ! window.addEventListener || typeof URL === 'undefined' ) {

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return;

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}

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/** @namespace wp */

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window.wp = window.wp || {};

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/* Abort if script was already executed. */

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if ( !! window.wp.receiveEmbedMessage ) {

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return;

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}

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/**

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* Receive embed message.

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*

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* @param {MessageEvent} e

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*/

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window.wp.receiveEmbedMessage = function( e ) {

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var data = e.data;

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/* Verify shape of message. */

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if (

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! ( data || data.secret || data.message || data.value ) ||

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/[^a-zA-Z0-9]/.test( data.secret )

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) {

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return;

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}

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var iframes = document.querySelectorAll( 'iframe[data-secret="' + data.secret + '"]' ),

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blockquotes = document.querySelectorAll( 'blockquote[data-secret="' + data.secret + '"]' ),

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allowedProtocols = new RegExp( '^https?:$', 'i' ),

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i, source, height, sourceURL, targetURL;

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for ( i = 0; i < blockquotes.length; i++ ) {

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blockquotes[ i ].style.display = 'none';

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}

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for ( i = 0; i < iframes.length; i++ ) {

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source = iframes[ i ];

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if ( e.source !== source.contentWindow ) {

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continue;

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}

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source.removeAttribute( 'style' );

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if ( 'height' === data.message ) {

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/* Resize the iframe on request. */

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height = parseInt( data.value, 10 );

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if ( height > 1000 ) {

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height = 1000;

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} else if ( ~~height < 200 ) {

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height = 200;

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}

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source.height = height;

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} else if ( 'link' === data.message ) {

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/* Link to a specific URL on request. */

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sourceURL = new URL( source.getAttribute( 'src' ) );

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targetURL = new URL( data.value );

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if (

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allowedProtocols.test( targetURL.protocol ) &&

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targetURL.host === sourceURL.host &&

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document.activeElement === source

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) {

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window.top.location.href = data.value;

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}

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}

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}

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};

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function onLoad() {

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var iframes = document.querySelectorAll( 'iframe.wp-embedded-content' ),

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i, source, secret;

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for ( i = 0; i < iframes.length; i++ ) {

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/** @var {IframeElement} */

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source = iframes[ i ];

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secret = source.getAttribute( 'data-secret' );

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if ( ! secret ) {

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/* Add secret to iframe */

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secret = Math.random().toString( 36 ).substring( 2, 12 );

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source.src += '#?secret=' + secret;

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source.setAttribute( 'data-secret', secret );

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}

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/*

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* Let post embed window know that the parent is ready for receiving the height message, in case the iframe

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* loaded before wp-embed.js was loaded. When the ready message is received by the post embed window, the

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* window will then (re-)send the height message right away.

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*/

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source.contentWindow.postMessage( {

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message: 'ready',

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secret: secret

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}, '*' );

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}

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}

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window.addEventListener( 'message', window.wp.receiveEmbedMessage, false );

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document.addEventListener( 'DOMContentLoaded', onLoad, false );

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})( window, document );

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