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https://github.com/BookStackApp/BookStack.git
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db7b11fe93
Adds a thin wrapper for DOMDocument to simplify and align usage within all areas of BookStack. Also means we move away from old depreacted mb_convert_encoding usage. Closes #4638
54 lines
1.5 KiB
PHP
54 lines
1.5 KiB
PHP
<?php
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namespace BookStack\Util;
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use DOMElement;
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use DOMNodeList;
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class HtmlNonceApplicator
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{
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protected static string $placeholder = '[CSP_NONCE_VALUE]';
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/**
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* Prepare the given HTML content with nonce attributes including a placeholder
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* value which we can target later.
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*/
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public static function prepare(string $html): string
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{
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if (empty($html)) {
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return $html;
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}
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// LIBXML_SCHEMA_CREATE was found to be required here otherwise
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// the PHP DOMDocument handling will attempt to format/close
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// HTML tags within scripts and therefore change JS content.
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$doc = new HtmlDocument($html, LIBXML_SCHEMA_CREATE);
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// Apply to scripts
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$scriptElems = $doc->queryXPath('//script');
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static::addNonceAttributes($scriptElems, static::$placeholder);
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// Apply to styles
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$styleElems = $doc->queryXPath('//style');
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static::addNonceAttributes($styleElems, static::$placeholder);
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return $doc->getBodyInnerHtml();
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}
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/**
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* Apply the give nonce value to the given prepared HTML.
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*/
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public static function apply(string $html, string $nonce): string
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{
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return str_replace(static::$placeholder, $nonce, $html);
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}
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protected static function addNonceAttributes(DOMNodeList $nodes, string $attrValue): void
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{
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/** @var DOMElement $node */
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foreach ($nodes as $node) {
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$node->setAttribute('nonce', $attrValue);
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}
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}
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}
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