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Diffstat (limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt')
| -rw-r--r-- | vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt new file mode 100644 index 0000000..078d087 --- /dev/null +++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/Filter.ExtractStyleBlocks.txt @@ -0,0 +1,74 @@ +Filter.ExtractStyleBlocks +TYPE: bool +VERSION: 3.1.0 +DEFAULT: false +EXTERNAL: CSSTidy +--DESCRIPTION-- +<p> + This directive turns on the style block extraction filter, which removes + <code>style</code> blocks from input HTML, cleans them up with CSSTidy, + and places them in the <code>StyleBlocks</code> context variable, for further + use by you, usually to be placed in an external stylesheet, or a + <code>style</code> block in the <code>head</code> of your document. +</p> +<p> + Sample usage: +</p> +<pre><![CDATA[ +<?php + header('Content-type: text/html; charset=utf-8'); + echo '<?xml version="1.0" encoding="UTF-8"?>'; +?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> +<head> + <title>Filter.ExtractStyleBlocks</title> +<?php + require_once '/path/to/library/HTMLPurifier.auto.php'; + require_once '/path/to/csstidy.class.php'; + + $dirty = '<style>body {color:#F00;}</style> Some text'; + + $config = HTMLPurifier_Config::createDefault(); + $config->set('Filter', 'ExtractStyleBlocks', true); + $purifier = new HTMLPurifier($config); + + $html = $purifier->purify($dirty); + + // This implementation writes the stylesheets to the styles/ directory. + // You can also echo the styles inside the document, but it's a bit + // more difficult to make sure they get interpreted properly by + // browsers; try the usual CSS armoring techniques. + $styles = $purifier->context->get('StyleBlocks'); + $dir = 'styles/'; + if (!is_dir($dir)) mkdir($dir); + $hash = sha1($_GET['html']); + foreach ($styles as $i => $style) { + file_put_contents($name = $dir . $hash . "_$i"); + echo '<link rel="stylesheet" type="text/css" href="'.$name.'" />'; + } +?> +</head> +<body> + <div> + <?php echo $html; ?> + </div> +</b]]><![CDATA[ody> +</html> +]]></pre> +<p> + <strong>Warning:</strong> It is possible for a user to mount an + imagecrash attack using this CSS. Counter-measures are difficult; + it is not simply enough to limit the range of CSS lengths (using + relative lengths with many nesting levels allows for large values + to be attained without actually specifying them in the stylesheet), + and the flexible nature of selectors makes it difficult to selectively + disable lengths on image tags (HTML Purifier, however, does disable + CSS width and height in inline styling). There are probably two effective + counter measures: an explicit width and height set to auto in all + images in your document (unlikely) or the disabling of width and + height (somewhat reasonable). Whether or not these measures should be + used is left to the reader. +</p> +--# vim: et sw=4 sts=4 |