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Emoji: Work around a mod_security rule which prevents pages with 4 or more instances of String.fromCharCode( from being served.

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Fixes #35412 for trunk.


git-svn-id: https://develop.svn.wordpress.org/trunk@36359 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Dion Hulse 2016-01-20 07:39:47 +00:00
parent 1d82f671a3
commit 65267f09fb
1 changed files with 6 additions and 5 deletions
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11
src/wp-includes/js/wp-emoji-loader.js
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@ -13,6 +13,7 @@
function browserSupportsEmoji( type ) {
var canvas = document.createElement( 'canvas' ),
context = canvas.getContext && canvas.getContext( '2d' ),
stringFromCharCode = String.fromCharCode,
tone;
if ( ! context || ! context.fillText ) {
@ -37,7 +38,7 @@
* The first two will encode to small images (1-2KB data URLs), the third will encode
* to a larger image (4-5KB data URL).
*/
context.fillText( String.fromCharCode( 55356, 56806, 55356, 56826 ), 0, 0 );
context.fillText( stringFromCharCode( 55356, 56806, 55356, 56826 ), 0, 0 );
return canvas.toDataURL().length > 3000;
} else if ( 'diversity' === type ) {
/*
@ -45,9 +46,9 @@
* emoji with no skin tone specified (in this case, Santa). It then adds a skin tone, and
* compares if the emoji rendering has changed.
*/
context.fillText( String.fromCharCode( 55356, 57221 ), 0, 0 );
context.fillText( stringFromCharCode( 55356, 57221 ), 0, 0 );
tone = context.getImageData( 16, 16, 1, 1 ).data.toString();
context.fillText( String.fromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 );
context.fillText( stringFromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 );
// Chrome has issues comparing arrays, so we compare it as a string, instead.
return tone !== context.getImageData( 16, 16, 1, 1 ).data.toString();
} else {
@ -57,13 +58,13 @@
* center pixel. In browsers that don't support emoji, the character will be rendered
* as an empty square, so the center pixel will be blank.
*/
context.fillText( String.fromCharCode( 55357, 56835 ), 0, 0 );
context.fillText( stringFromCharCode( 55357, 56835 ), 0, 0 );
} else {
/*
* To check for Unicode 8 support, let's try rendering the most important advancement
* that the Unicode Consortium have made in years: the burrito.
*/
context.fillText( String.fromCharCode( 55356, 57135 ), 0, 0 );
context.fillText( stringFromCharCode( 55356, 57135 ), 0, 0 );
}
return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;
}