[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  /**
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2022 The s9e authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\Collections;
   9  
  10  use s9e\TextFormatter\Configurator\Helpers\RegexpBuilder;
  11  use s9e\TextFormatter\Configurator\Items\Regexp;
  12  
  13  class HostnameList extends NormalizedList
  14  {
  15      /**
  16      * Return this hostname list as a regexp's config
  17      *
  18      * @return Regexp|null A Regexp instance, or NULL if the collection is empty
  19      */
  20  	public function asConfig()
  21      {
  22          if (empty($this->items))
  23          {
  24              return null;
  25          }
  26  
  27          return new Regexp($this->getRegexp());
  28      }
  29  
  30      /**
  31      * Return a regexp that matches the list of hostnames
  32      *
  33      * @return string
  34      */
  35  	public function getRegexp()
  36      {
  37          $hosts = [];
  38          foreach ($this->items as $host)
  39          {
  40              $hosts[] = $this->normalizeHostmask($host);
  41          }
  42  
  43          $regexp = RegexpBuilder::fromList(
  44              $hosts,
  45              [
  46                  // Asterisks * are turned into a catch-all expression, while ^ and $ are preserved
  47                  'specialChars' => [
  48                      '*' => '.*',
  49                      '^' => '^',
  50                      '$' => '$'
  51                  ]
  52              ]
  53          );
  54  
  55          return '/' . $regexp . '/DSis';
  56      }
  57  
  58      /**
  59      * Normalize a hostmask to a regular expression
  60      *
  61      * @param  string $host Hostname or hostmask
  62      * @return string
  63      */
  64  	protected function normalizeHostmask($host)
  65      {
  66          if (preg_match('#[\\x80-\xff]#', $host) && function_exists('idn_to_ascii'))
  67          {
  68              $variant = (defined('INTL_IDNA_VARIANT_UTS46')) ? INTL_IDNA_VARIANT_UTS46 : 0;
  69              $host = idn_to_ascii($host, 0, $variant);
  70          }
  71  
  72          if (substr($host, 0, 1) === '*')
  73          {
  74              // *.example.com => /\.example\.com$/
  75              $host = ltrim($host, '*');
  76          }
  77          else
  78          {
  79              // example.com => /^example\.com$/
  80              $host = '^' . $host;
  81          }
  82  
  83          if (substr($host, -1) === '*')
  84          {
  85              // example.* => /^example\./
  86              $host = rtrim($host, '*');
  87          }
  88          else
  89          {
  90              // example.com => /^example\.com$/
  91              $host .= '$';
  92          }
  93  
  94          return $host;
  95      }
  96  }