File indexing completed on 2024-12-29 05:27:24

 <?php
 namespace GuzzleHttp\Psr7;
 
 use Psr\Http\Message\UriInterface;
 
 /**
  * Resolves a URI reference in the context of a base URI and the opposite way.
  *
  * @author Tobias Schultze
  *
  * @link https://tools.ietf.org/html/rfc3986#section-5
  */
 final class UriResolver
 {
     /**
      * Removes dot segments from a path and returns the new path.
      *
      * @param string $path
      *
      * @return string
      * @link http://tools.ietf.org/html/rfc3986#section-5.2.4
      */
     public static function removeDotSegments($path)
     {
         if ($path === '' || $path === '/') {
             return $path;
         }
 
         $results = [];
         $segments = explode('/', $path);
         foreach ($segments as $segment) {
             if ($segment === '..') {
                 array_pop($results);
             } elseif ($segment !== '.') {
                 $results[] = $segment;
             }
         }
 
         $newPath = implode('/', $results);
 
         if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {
             // Re-add the leading slash if necessary for cases like "/.."
             $newPath = '/' . $newPath;
         } elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {
             // Add the trailing slash if necessary
             // If newPath is not empty, then $segment must be set and is the last segment from the foreach
             $newPath .= '/';
         }
 
         return $newPath;
     }
 
     /**
      * Converts the relative URI into a new URI that is resolved against the base URI.
      *
      * @param UriInterface $base Base URI
      * @param UriInterface $rel  Relative URI
      *
      * @return UriInterface
      * @link http://tools.ietf.org/html/rfc3986#section-5.2
      */
     public static function resolve(UriInterface $base, UriInterface $rel)
     {
         if ((string) $rel === '') {
             // we can simply return the same base URI instance for this same-document reference
             return $base;
         }
 
         if ($rel->getScheme() != '') {
             return $rel->withPath(self::removeDotSegments($rel->getPath()));
         }
 
         if ($rel->getAuthority() != '') {
             $targetAuthority = $rel->getAuthority();
             $targetPath = self::removeDotSegments($rel->getPath());
             $targetQuery = $rel->getQuery();
         } else {
             $targetAuthority = $base->getAuthority();
             if ($rel->getPath() === '') {
                 $targetPath = $base->getPath();
                 $targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
             } else {
                 if ($rel->getPath()[0] === '/') {
                     $targetPath = $rel->getPath();
                 } else {
                     if ($targetAuthority != '' && $base->getPath() === '') {
                         $targetPath = '/' . $rel->getPath();
                     } else {
                         $lastSlashPos = strrpos($base->getPath(), '/');
                         if ($lastSlashPos === false) {
                             $targetPath = $rel->getPath();
                         } else {
                             $targetPath = substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();
                         }
                     }
                 }
                 $targetPath = self::removeDotSegments($targetPath);
                 $targetQuery = $rel->getQuery();
             }
         }
 
         return new Uri(Uri::composeComponents(
             $base->getScheme(),
             $targetAuthority,
             $targetPath,
             $targetQuery,
             $rel->getFragment()
         ));
     }
 
     /**
      * Returns the target URI as a relative reference from the base URI.
      *
      * This method is the counterpart to resolve():
      *
      *    (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
      *
      * One use-case is to use the current request URI as base URI and then generate relative links in your documents
      * to reduce the document size or offer self-contained downloadable document archives.
      *
      *    $base = new Uri('http://example.com/a/b/');
      *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
      *    echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
      *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
      *    echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
      *
      * This method also accepts a target that is already relative and will try to relativize it further. Only a
      * relative-path reference will be returned as-is.
      *
      *    echo UriResolver::relativize($base, new Uri('/a/b/c'));  // prints 'c' as well
      *
      * @param UriInterface $base   Base URI
      * @param UriInterface $target Target URI
      *
      * @return UriInterface The relative URI reference
      */
     public static function relativize(UriInterface $base, UriInterface $target)
     {
         if ($target->getScheme() !== '' &&
             ($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')
         ) {
             return $target;
         }
 
         if (Uri::isRelativePathReference($target)) {
             // As the target is already highly relative we return it as-is. It would be possible to resolve
             // the target with `$target = self::resolve($base, $target);` and then try make it more relative
             // by removing a duplicate query. But let's not do that automatically.
             return $target;
         }
 
         if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
             return $target->withScheme('');
         }
 
         // We must remove the path before removing the authority because if the path starts with two slashes, the URI
         // would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
         // invalid.
         $emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
 
         if ($base->getPath() !== $target->getPath()) {
             return $emptyPathUri->withPath(self::getRelativePath($base, $target));
         }
 
         if ($base->getQuery() === $target->getQuery()) {
             // Only the target fragment is left. And it must be returned even if base and target fragment are the same.
             return $emptyPathUri->withQuery('');
         }
 
         // If the base URI has a query but the target has none, we cannot return an empty path reference as it would
         // inherit the base query component when resolving.
         if ($target->getQuery() === '') {
             $segments = explode('/', $target->getPath());
             $lastSegment = end($segments);
 
             return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
         }
 
         return $emptyPathUri;
     }
 
     private static function getRelativePath(UriInterface $base, UriInterface $target)
     {
         $sourceSegments = explode('/', $base->getPath());
         $targetSegments = explode('/', $target->getPath());
         array_pop($sourceSegments);
         $targetLastSegment = array_pop($targetSegments);
         foreach ($sourceSegments as $i => $segment) {
             if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
                 unset($sourceSegments[$i], $targetSegments[$i]);
             } else {
                 break;
             }
         }
         $targetSegments[] = $targetLastSegment;
         $relativePath = str_repeat('../', count($sourceSegments)) . implode('/', $targetSegments);
 
         // A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
         // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
         // as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
         if ('' === $relativePath || false !== strpos(explode('/', $relativePath, 2)[0], ':')) {
             $relativePath = "./$relativePath";
         } elseif ('/' === $relativePath[0]) {
             if ($base->getAuthority() != '' && $base->getPath() === '') {
                 // In this case an extra slash is added by resolve() automatically. So we must not add one here.
                 $relativePath = ".$relativePath";
             } else {
                 $relativePath = "./$relativePath";
             }
         }
 
         return $relativePath;
     }
 
     private function __construct()
     {
         // cannot be instantiated
     }
 }