mirror of https://github.com/friendica/friendica
55 lines
1.9 KiB
PHP
55 lines
1.9 KiB
PHP
<?php
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/**
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* Microsoft's proprietary filter: CSS property
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* @note Currently supports the alpha filter. In the future, this will
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* probably need an extensible framework
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*/
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class HTMLPurifier_AttrDef_CSS_Filter extends HTMLPurifier_AttrDef
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{
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protected $intValidator;
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public function __construct() {
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$this->intValidator = new HTMLPurifier_AttrDef_Integer();
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}
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public function validate($value, $config, $context) {
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$value = $this->parseCDATA($value);
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if ($value === 'none') return $value;
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// if we looped this we could support multiple filters
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$function_length = strcspn($value, '(');
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$function = trim(substr($value, 0, $function_length));
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if ($function !== 'alpha' &&
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$function !== 'Alpha' &&
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$function !== 'progid:DXImageTransform.Microsoft.Alpha'
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) return false;
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$cursor = $function_length + 1;
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$parameters_length = strcspn($value, ')', $cursor);
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$parameters = substr($value, $cursor, $parameters_length);
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$params = explode(',', $parameters);
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$ret_params = array();
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$lookup = array();
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foreach ($params as $param) {
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list($key, $value) = explode('=', $param);
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$key = trim($key);
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$value = trim($value);
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if (isset($lookup[$key])) continue;
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if ($key !== 'opacity') continue;
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$value = $this->intValidator->validate($value, $config, $context);
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if ($value === false) continue;
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$int = (int) $value;
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if ($int > 100) $value = '100';
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if ($int < 0) $value = '0';
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$ret_params[] = "$key=$value";
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$lookup[$key] = true;
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}
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$ret_parameters = implode(',', $ret_params);
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$ret_function = "$function($ret_parameters)";
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return $ret_function;
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}
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}
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// vim: et sw=4 sts=4
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