Filter.php

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<?php

class HTMLPurifier_AttrDef_CSS_Filter extends HTMLPurifier_AttrDef
{

    protected $intValidator;

    public function __construct() {
        $this->intValidator = new HTMLPurifier_AttrDef_Integer();
    }

    public function validate($value, $config, $context) {
        $value = $this->parseCDATA($value);
        if ($value === 'none') return $value;
        // if we looped this we could support multiple filters
        $function_length = strcspn($value, '(');
        $function = trim(substr($value, 0, $function_length));
        if ($function !== 'alpha' &&
            $function !== 'Alpha' &&
            $function !== 'progid:DXImageTransform.Microsoft.Alpha'
            ) return false;
        $cursor = $function_length + 1;
        $parameters_length = strcspn($value, ')', $cursor);
        $parameters = substr($value, $cursor, $parameters_length);
        $params = explode(',', $parameters);
        $ret_params = array();
        $lookup = array();
        foreach ($params as $param) {
            list($key, $value) = explode('=', $param);
            $key   = trim($key);
            $value = trim($value);
            if (isset($lookup[$key])) continue;
            if ($key !== 'opacity') continue;
            $value = $this->intValidator->validate($value, $config, $context);
            if ($value === false) continue;
            $int = (int) $value;
            if ($int > 100) $value = '100';
            if ($int < 0) $value = '0';
            $ret_params[] = "$key=$value";
            $lookup[$key] = true;
        }
        $ret_parameters = implode(',', $ret_params);
        $ret_function = "$function($ret_parameters)";
        return $ret_function;
    }

}

// vim: et sw=4 sts=4