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   1  <?php
   2  
   3  namespace GuzzleHttp\Psr7;
   4  
   5  use Psr\Http\Message\UriInterface;
   6  
   7  /**
   8   * Provides methods to determine if a modified URL should be considered cross-origin.
   9   *
  10   * @author Graham Campbell
  11   */
  12  final class UriComparator
  13  {
  14      /**
  15       * Determines if a modified URL should be considered cross-origin with
  16       * respect to an original URL.
  17       *
  18       * @return bool
  19       */
  20      public static function isCrossOrigin(UriInterface $original, UriInterface $modified)
  21      {
  22          if (\strcasecmp($original->getHost(), $modified->getHost()) !== 0) {
  23              return true;
  24          }
  25  
  26          if ($original->getScheme() !== $modified->getScheme()) {
  27              return true;
  28          }
  29  
  30          if (self::computePort($original) !== self::computePort($modified)) {
  31              return true;
  32          }
  33  
  34          return false;
  35      }
  36  
  37      /**
  38       * @return int
  39       */
  40      private static function computePort(UriInterface $uri)
  41      {
  42          $port = $uri->getPort();
  43  
  44          if (null !== $port) {
  45              return $port;
  46          }
  47  
  48          return 'https' === $uri->getScheme() ? 443 : 80;
  49      }
  50  
  51      private function __construct()
  52      {
  53          // cannot be instantiated
  54      }
  55  }