library/HTMLPurifier/VarParser/Flexible.php

   1 <?php
   2
   3 /**
   4  * Performs safe variable parsing based on types which can be used by
   5  * users. This may not be able to represent all possible data inputs,
   6  * however.
   7  */
   8 class HTMLPurifier_VarParser_Flexible extends HTMLPurifier_VarParser
   9 {
  10
  11     protected function parseImplementation($var, $type, $allow_null) {
  12         if ($allow_null && $var === null) return null;
  13         switch ($type) {
  14             // Note: if code "breaks" from the switch, it triggers a generic
  15             // exception to be thrown. Specific errors can be specifically
  16             // done here.
  17             case self::MIXED :
  18             case self::ISTRING :
  19             case self::STRING :
  20             case self::TEXT :
  21             case self::ITEXT :
  22                 return $var;
  23             case self::INT :
  24                 if (is_string($var) && ctype_digit($var)) $var = (int) $var;
  25                 return $var;
  26             case self::FLOAT :
  27                 if ((is_string($var) && is_numeric($var)) || is_int($var)) $var = (float) $var;
  28                 return $var;
  29             case self::BOOL :
  30                 if (is_int($var) && ($var === 0 || $var === 1)) {
  31                     $var = (bool) $var;
  32                 } elseif (is_string($var)) {
  33                     if ($var == 'on' || $var == 'true' || $var == '1') {
  34                         $var = true;
  35                     } elseif ($var == 'off' || $var == 'false' || $var == '0') {
  36                         $var = false;
  37                     } else {
  38                         throw new HTMLPurifier_VarParserException("Unrecognized value '$var' for $type");
  39                     }
  40                 }
  41                 return $var;
  42             case self::ALIST :
  43             case self::HASH :
  44             case self::LOOKUP :
  45                 if (is_string($var)) {
  46                     // special case: technically, this is an array with
  47                     // a single empty string item, but having an empty
  48                     // array is more intuitive
  49                     if ($var == '') return array();
  50                     if (strpos($var, "\n") === false && strpos($var, "\r") === false) {
  51                         // simplistic string to array method that only works
  52                         // for simple lists of tag names or alphanumeric characters
  53                         $var = explode(',',$var);
  54                     } else {
  55                         $var = preg_split('/(,|[\n\r]+)/', $var);
  56                     }
  57                     // remove spaces
  58                     foreach ($var as $i => $j) $var[$i] = trim($j);
  59                     if ($type === self::HASH) {
  60                         // key:value,key2:value2
  61                         $nvar = array();
  62                         foreach ($var as $keypair) {
  63                             $c = explode(':', $keypair, 2);
  64                             if (!isset($c[1])) continue;
  65                             $nvar[$c[0]] = $c[1];
  66                         }
  67                         $var = $nvar;
  68                     }
  69                 }
  70                 if (!is_array($var)) break;
  71                 $keys = array_keys($var);
  72                 if ($keys === array_keys($keys)) {
  73                     if ($type == self::ALIST) return $var;
  74                     elseif ($type == self::LOOKUP) {
  75                         $new = array();
  76                         foreach ($var as $key) {
  77                             $new[$key] = true;
  78                         }
  79                         return $new;
  80                     } else break;
  81                 }
  82                 if ($type === self::LOOKUP) {
  83                     foreach ($var as $key => $value) {
  84                         $var[$key] = true;
  85                     }
  86                 }
  87                 return $var;
  88             default:
  89                 $this->errorInconsistent(__CLASS__, $type);
  90         }
  91         $this->errorGeneric($var, $type);
  92     }
  93
  94 }
  95
  96 // vim: et sw=4 sts=4