wp-includes/js/wp-embed.js

   1 /**
   2  * WordPress inline HTML embed
   3  *
   4  * @since 4.4.0
   5  *
   6  * This file cannot have ampersands in it. This is to ensure
   7  * it can be embedded in older versions of WordPress.
   8  * See https://core.trac.wordpress.org/changeset/35708.
   9  */
  10 (function ( window, document ) {
  11         'use strict';
  12
  13         var supportedBrowser = false,
  14                 loaded = false;
  15
  16                 if ( document.querySelector ) {
  17                         if ( window.addEventListener ) {
  18                                 supportedBrowser = true;
  19                         }
  20                 }
  21
  22         window.wp = window.wp || {};
  23
  24         if ( !! window.wp.receiveEmbedMessage ) {
  25                 return;
  26         }
  27
  28         window.wp.receiveEmbedMessage = function( e ) {
  29                 var data = e.data;
  30                 if ( ! ( data.secret || data.message || data.value ) ) {
  31                         return;
  32                 }
  33
  34                 if ( /[^a-zA-Z0-9]/.test( data.secret ) ) {
  35                         return;
  36                 }
  37
  38                 var iframes = document.querySelectorAll( 'iframe[data-secret="' + data.secret + '"]' ),
  39                         blockquotes = document.querySelectorAll( 'blockquote[data-secret="' + data.secret + '"]' ),
  40                         i, source, height, sourceURL, targetURL;
  41
  42                 for ( i = 0; i < blockquotes.length; i++ ) {
  43                         blockquotes[ i ].style.display = 'none';
  44                 }
  45
  46                 for ( i = 0; i < iframes.length; i++ ) {
  47                         source = iframes[ i ];
  48
  49                         if ( e.source !== source.contentWindow ) {
  50                                 continue;
  51                         }
  52
  53                         source.style.display = '';
  54
  55                         /* Resize the iframe on request. */
  56                         if ( 'height' === data.message ) {
  57                                 height = parseInt( data.value, 10 );
  58                                 if ( height > 1000 ) {
  59                                         height = 1000;
  60                                 } else if ( ~~height < 200 ) {
  61                                         height = 200;
  62                                 }
  63
  64                                 source.height = height;
  65                         }
  66
  67                         /* Link to a specific URL on request. */
  68                         if ( 'link' === data.message ) {
  69                                 sourceURL = document.createElement( 'a' );
  70                                 targetURL = document.createElement( 'a' );
  71
  72                                 sourceURL.href = source.getAttribute( 'src' );
  73                                 targetURL.href = data.value;
  74
  75                                 /* Only continue if link hostname matches iframe's hostname. */
  76                                 if ( targetURL.host === sourceURL.host ) {
  77                                         if ( document.activeElement === source ) {
  78                                                 window.top.location.href = data.value;
  79                                         }
  80                                 }
  81                         }
  82                 }
  83         };
  84
  85         function onLoad() {
  86                 if ( loaded ) {
  87                         return;
  88                 }
  89                 loaded = true;
  90
  91                 var isIE10 = -1 !== navigator.appVersion.indexOf( 'MSIE 10' ),
  92                         isIE11 = !!navigator.userAgent.match( /Trident.*rv:11\./ ),
  93                         iframes = document.querySelectorAll( 'iframe.wp-embedded-content' ),
  94                         blockquotes = document.querySelectorAll( 'blockquote.wp-embedded-content' ),
  95                         iframeClone, i, source, secret;
  96
  97                 for ( i = 0; i < blockquotes.length; i++ ) {
  98                         blockquotes[ i ].style.display = 'none';
  99                 }
 100
 101                 for ( i = 0; i < iframes.length; i++ ) {
 102                         source = iframes[ i ];
 103                         source.style.display = '';
 104
 105                         if ( source.getAttribute( 'data-secret' ) ) {
 106                                 continue;
 107                         }
 108
 109                         /* Add secret to iframe */
 110                         secret = Math.random().toString( 36 ).substr( 2, 10 );
 111                         source.src += '#?secret=' + secret;
 112                         source.setAttribute( 'data-secret', secret );
 113
 114                         /* Remove security attribute from iframes in IE10 and IE11. */
 115                         if ( ( isIE10 || isIE11 ) ) {
 116                                 iframeClone = source.cloneNode( true );
 117                                 iframeClone.removeAttribute( 'security' );
 118                                 source.parentNode.replaceChild( iframeClone, source );
 119                         }
 120                 }
 121         }
 122
 123         if ( supportedBrowser ) {
 124                 window.addEventListener( 'message', window.wp.receiveEmbedMessage, false );
 125                 document.addEventListener( 'DOMContentLoaded', onLoad, false );
 126                 window.addEventListener( 'load', onLoad, false );
 127         }
 128 })( window, document );