https://uniside.hu/wp-includes/js/wp-embed.js

1/**
2 * WordPress inline HTML embed
3 *
4 * @since 4.4.0
5 * @output wp-includes/js/wp-embed.js
6 *
7 * Single line comments should not be used since they will break
8 * the script when inlined in get_post_embed_html(), specifically
9 * when the comments are not stripped out due to SCRIPT_DEBUG
10 * being turned on.
11 */
12(function ( window, document ) {
13	'use strict';
14
15	/* Abort for ancient browsers. */
16	if ( ! document.querySelector || ! window.addEventListener || typeof URL === 'undefined' ) {
17		return;
18	}
19
20	/** @namespace wp */
21	window.wp = window.wp || {};
22
23	/* Abort if script was already executed. */
24	if ( !! window.wp.receiveEmbedMessage ) {
25		return;
26	}
27
28	/**
29	 * Receive embed message.
30	 *
31	 * @param {MessageEvent} e
32	 */
33	window.wp.receiveEmbedMessage = function( e ) {
34		var data = e.data;
35
36		/* Verify shape of message. */
37		if (
38			! ( data || data.secret || data.message || data.value ) ||
39			/[^a-zA-Z0-9]/.test( data.secret )
40		) {
41			return;
42		}
43
44		var iframes = document.querySelectorAll( 'iframe[data-secret="' + data.secret + '"]' ),
45			blockquotes = document.querySelectorAll( 'blockquote[data-secret="' + data.secret + '"]' ),
46			allowedProtocols = new RegExp( '^https?:$', 'i' ),
47			i, source, height, sourceURL, targetURL;
48
49		for ( i = 0; i < blockquotes.length; i++ ) {
50			blockquotes[ i ].style.display = 'none';
51		}
52
53		for ( i = 0; i < iframes.length; i++ ) {
54			source = iframes[ i ];
55
56			if ( e.source !== source.contentWindow ) {
57				continue;
58			}
59
60			source.removeAttribute( 'style' );
61
62			if ( 'height' === data.message ) {
63				/* Resize the iframe on request. */
64				height = parseInt( data.value, 10 );
65				if ( height > 1000 ) {
66					height = 1000;
67				} else if ( ~~height < 200 ) {
68					height = 200;
69				}
70
71				source.height = height;
72			} else if ( 'link' === data.message ) {
73				/* Link to a specific URL on request. */
74				sourceURL = new URL( source.getAttribute( 'src' ) );
75				targetURL = new URL( data.value );
76
77				if (
78					allowedProtocols.test( targetURL.protocol ) &&
79					targetURL.host === sourceURL.host &&
80					document.activeElement === source
81				) {
82					window.top.location.href = data.value;
83				}
84			}
85		}
86	};
87
88	function onLoad() {
89		var iframes = document.querySelectorAll( 'iframe.wp-embedded-content' ),
90			i, source, secret;
91
92		for ( i = 0; i < iframes.length; i++ ) {
93			/** @var {IframeElement} */
94			source = iframes[ i ];
95
96			secret = source.getAttribute( 'data-secret' );
97			if ( ! secret ) {
98				/* Add secret to iframe */
99				secret = Math.random().toString( 36 ).substring( 2, 12 );
100				source.src += '#?secret=' + secret;

101				source.setAttribute( 'data-secret', secret );
102			}
103
104			/*
105			 * Let post embed window know that the parent is ready for receiving the height message, in case the iframe
106			 * loaded before wp-embed.js was loaded. When the ready message is received by the post embed window, the
107			 * window will then (re-)send the height message right away.
108			 */
109			source.contentWindow.postMessage( {
110				message: 'ready',
111				secret: secret
112			}, '*' );
113		}
114	}
115
116	window.addEventListener( 'message', window.wp.receiveEmbedMessage, false );
117	document.addEventListener( 'DOMContentLoaded', onLoad, false );
118})( window, document );