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   1  <?php
   2  
   3  /**
   4   * Validates shorthand CSS property background.
   5   * @warning Does not support url tokens that have internal spaces.
   6   */
   7  class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
   8  {
   9  
  10      /**
  11       * Local copy of component validators.
  12       * @type HTMLPurifier_AttrDef[]
  13       * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
  14       */
  15      protected $info;
  16  
  17      /**
  18       * @param HTMLPurifier_Config $config
  19       */
  20      public function __construct($config)
  21      {
  22          $def = $config->getCSSDefinition();
  23          $this->info['background-color'] = $def->info['background-color'];
  24          $this->info['background-image'] = $def->info['background-image'];
  25          $this->info['background-repeat'] = $def->info['background-repeat'];
  26          $this->info['background-attachment'] = $def->info['background-attachment'];
  27          $this->info['background-position'] = $def->info['background-position'];
  28      }
  29  
  30      /**
  31       * @param string $string
  32       * @param HTMLPurifier_Config $config
  33       * @param HTMLPurifier_Context $context
  34       * @return bool|string
  35       */
  36      public function validate($string, $config, $context)
  37      {
  38          // regular pre-processing
  39          $string = $this->parseCDATA($string);
  40          if ($string === '') {
  41              return false;
  42          }
  43  
  44          // munge rgb() decl if necessary
  45          $string = $this->mungeRgb($string);
  46  
  47          // assumes URI doesn't have spaces in it
  48          $bits = explode(' ', $string); // bits to process
  49  
  50          $caught = array();
  51          $caught['color'] = false;
  52          $caught['image'] = false;
  53          $caught['repeat'] = false;
  54          $caught['attachment'] = false;
  55          $caught['position'] = false;
  56  
  57          $i = 0; // number of catches
  58  
  59          foreach ($bits as $bit) {
  60              if ($bit === '') {
  61                  continue;
  62              }
  63              foreach ($caught as $key => $status) {
  64                  if ($key != 'position') {
  65                      if ($status !== false) {
  66                          continue;
  67                      }
  68                      $r = $this->info['background-' . $key]->validate($bit, $config, $context);
  69                  } else {
  70                      $r = $bit;
  71                  }
  72                  if ($r === false) {
  73                      continue;
  74                  }
  75                  if ($key == 'position') {
  76                      if ($caught[$key] === false) {
  77                          $caught[$key] = '';
  78                      }
  79                      $caught[$key] .= $r . ' ';
  80                  } else {
  81                      $caught[$key] = $r;
  82                  }
  83                  $i++;
  84                  break;
  85              }
  86          }
  87  
  88          if (!$i) {
  89              return false;
  90          }
  91          if ($caught['position'] !== false) {
  92              $caught['position'] = $this->info['background-position']->
  93                  validate($caught['position'], $config, $context);
  94          }
  95  
  96          $ret = array();
  97          foreach ($caught as $value) {
  98              if ($value === false) {
  99                  continue;
 100              }
 101              $ret[] = $value;
 102          }
 103  
 104          if (empty($ret)) {
 105              return false;
 106          }
 107          return implode(' ', $ret);
 108      }
 109  }
 110  
 111  // vim: et sw=4 sts=4