/**

 * WordPress inline HTML embed

 *

 * @since 4.4.0

 *

 * This file cannot have ampersands in it. This is to ensure

 * it can be embedded in older versions of WordPress.

 * See https://core.trac.wordpress.org/changeset/35708.

 */

(function ( window, document ) {

	'use strict';

	var supportedBrowser = false,

		loaded = false;

		if ( document.querySelector ) {

			if ( window.addEventListener ) {

				supportedBrowser = true;

			}

		}

	/** @namespace wp */

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

	if ( !! window.wp.receiveEmbedMessage ) {

		return;

	}

	window.wp.receiveEmbedMessage = function( e ) {

		var data = e.data;

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

			return;

		}

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

			return;

		}

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

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

			i, source, height, sourceURL, targetURL;

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

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

		}

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

			source = iframes[ i ];

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

				continue;

			}

			source.removeAttribute( 'style' );

			/* Resize the iframe on request. */

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

				height = parseInt( data.value, 10 );

				if ( height > 1000 ) {

					height = 1000;

				} else if ( ~~height < 200 ) {

					height = 200;

				}

				source.height = height;

			}

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

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

				sourceURL = document.createElement( 'a' );

				targetURL = document.createElement( 'a' );

				sourceURL.href = source.getAttribute( 'src' );

				targetURL.href = data.value;

				/* Only continue if link hostname matches iframe's hostname. */

				if ( targetURL.host === sourceURL.host ) {

					if ( document.activeElement === source ) {

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

					}

				}

			}

		}

	};

	function onLoad() {

		if ( loaded ) {

			return;

		}

		loaded = true;

		var isIE10 = -1 !== navigator.appVersion.indexOf( 'MSIE 10' ),

			isIE11 = !!navigator.userAgent.match( /Trident.*rv:11\./ ),

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

			iframeClone, i, source, secret;

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

			source = iframes[ i ];

			if ( ! source.getAttribute( 'data-secret' ) ) {

				/* Add secret to iframe */

				secret = Math.random().toString( 36 ).substr( 2, 10 );

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

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

			}

			/* Remove security attribute from iframes in IE10 and IE11. */

			if ( ( isIE10 || isIE11 ) ) {

				iframeClone = source.cloneNode( true );

				iframeClone.removeAttribute( 'security' );

				source.parentNode.replaceChild( iframeClone, source );

			}

		}

	}

	if ( supportedBrowser ) {

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

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

		window.addEventListener( 'load', onLoad, false );

	}

})( window, document );