<?php

/**
 * Validates a URI in CSS syntax, which uses url('http://example.com')
 * @note While theoretically speaking a URI in a CSS document could
 *       be non-embedded, as of CSS2 there is no such usage so we're
 *       generalizing it. This may need to be changed in the future.
 * @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
 *          the separator, you cannot put a literal semicolon in
 *          in the URI. Try percent encoding it, in that case.
 */
class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
{
    public function __construct()
    {
        parent::__construct(true); // always embedded
    }

    /**
     * @param string $uri_string
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($uri_string, $config, $context)
    {
        // parse the URI out of the string and then pass it onto
        // the parent object

        $uri_string = $this->parseCDATA($uri_string);
        if (strpos($uri_string, 'url(') !== 0) {
            return false;
        }
        $uri_string = substr($uri_string, 4);
        if (strlen($uri_string) == 0) {
            return false;
        }
        $new_length = strlen($uri_string) - 1;
        if ($uri_string[$new_length] != ')') {
            return false;
        }
        $uri = trim(substr($uri_string, 0, $new_length));

        if (!empty($uri) && ($uri[0] == "'" || $uri[0] == '"')) {
            $quote = $uri[0];
            $new_length = strlen($uri) - 1;
            if ($uri[$new_length] !== $quote) {
                return false;
            }
            $uri = substr($uri, 1, $new_length - 1);
        }

        $uri = $this->expandCSSEscape($uri);

        $result = parent::validate($uri, $config, $context);

        if ($result === false) {
            return false;
        }

        // extra sanity check; should have been done by URI
        $result = str_replace(array('"', "\\", "\n", "\x0c", "\r"), "", $result);

        // suspicious characters are ()'; we're going to percent encode
        // them for safety.
        $result = str_replace(array('(', ')', "'"), array('%28', '%29', '%27'), $result);

        // there's an extra bug where ampersands lose their escaping on
        // an innerHTML cycle, so a very unlucky query parameter could
        // then change the meaning of the URL.  Unfortunately, there's
        // not much we can do about that...
        return "url(\"$result\")";
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----Mjc0MjE0NTMyNTg5NTM5MCAzMjE2NzA5MzEyNTMxODc3IDU1MjIzNTA5NDQwOTQ4MzA=