/usr/share/php/HTMLPurifier/URIScheme/mailto.php is in php-htmlpurifier 4.7.0-1build1.
This file is owned by root:root, with mode 0o664.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40  | <?php
// VERY RELAXED! Shouldn't cause problems, not even Firefox checks if the
// email is valid, but be careful!
/**
 * Validates mailto (for E-mail) according to RFC 2368
 * @todo Validate the email address
 * @todo Filter allowed query parameters
 */
class HTMLPurifier_URIScheme_mailto extends HTMLPurifier_URIScheme
{
    /**
     * @type bool
     */
    public $browsable = false;
    /**
     * @type bool
     */
    public $may_omit_host = true;
    /**
     * @param HTMLPurifier_URI $uri
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool
     */
    public function doValidate(&$uri, $config, $context)
    {
        $uri->userinfo = null;
        $uri->host     = null;
        $uri->port     = null;
        // we need to validate path against RFC 2368's addr-spec
        return true;
    }
}
// vim: et sw=4 sts=4
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