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https://github.com/renbaoshuo/S2OJ.git
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96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
75 lines
2.4 KiB
PHP
75 lines
2.4 KiB
PHP
<?php
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/**
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* Validates a URI in CSS syntax, which uses url('http://example.com')
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* @note While theoretically speaking a URI in a CSS document could
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* be non-embedded, as of CSS2 there is no such usage so we're
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* generalizing it. This may need to be changed in the future.
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* @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
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* the separator, you cannot put a literal semicolon in
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* in the URI. Try percent encoding it, in that case.
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*/
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class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
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{
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public function __construct()
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{
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parent::__construct(true); // always embedded
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}
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/**
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* @param string $uri_string
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($uri_string, $config, $context)
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{
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// parse the URI out of the string and then pass it onto
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// the parent object
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$uri_string = $this->parseCDATA($uri_string);
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if (strpos($uri_string, 'url(') !== 0) {
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return false;
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}
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$uri_string = substr($uri_string, 4);
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$new_length = strlen($uri_string) - 1;
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if ($uri_string[$new_length] != ')') {
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return false;
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}
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$uri = trim(substr($uri_string, 0, $new_length));
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if (!empty($uri) && ($uri[0] == "'" || $uri[0] == '"')) {
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$quote = $uri[0];
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$new_length = strlen($uri) - 1;
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if ($uri[$new_length] !== $quote) {
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return false;
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}
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$uri = substr($uri, 1, $new_length - 1);
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}
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$uri = $this->expandCSSEscape($uri);
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$result = parent::validate($uri, $config, $context);
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if ($result === false) {
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return false;
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}
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// extra sanity check; should have been done by URI
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$result = str_replace(array('"', "\\", "\n", "\x0c", "\r"), "", $result);
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// suspicious characters are ()'; we're going to percent encode
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// them for safety.
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$result = str_replace(array('(', ')', "'"), array('%28', '%29', '%27'), $result);
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// there's an extra bug where ampersands lose their escaping on
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// an innerHTML cycle, so a very unlucky query parameter could
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// then change the meaning of the URL. Unfortunately, there's
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// not much we can do about that...
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return "url(\"$result\")";
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}
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}
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// vim: et sw=4 sts=4
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