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<?php |
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|
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/** |
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* League.Uri (https://uri.thephpleague.com) |
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* |
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* (c) Ignace Nyamagana Butera <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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|
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declare(strict_types=1); |
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|
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namespace League\Uri; |
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|
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use League\Uri\Contracts\UriInterface; |
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use Psr\Http\Message\UriInterface as Psr7UriInterface; |
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use function array_pop; |
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use function array_reduce; |
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use function count; |
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use function end; |
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use function explode; |
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use function gettype; |
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use function implode; |
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use function in_array; |
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use function sprintf; |
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use function str_repeat; |
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use function strpos; |
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use function substr; |
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|
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final class UriResolver |
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{ |
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/** |
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* @var array<string,int> |
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*/ |
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const DOT_SEGMENTS = ['.' => 1, '..' => 1]; |
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|
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/** |
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* @codeCoverageIgnore |
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*/ |
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private function __construct() |
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{ |
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} |
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|
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/** |
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* Resolve an URI against a base URI using RFC3986 rules. |
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* |
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* If the first argument is a UriInterface the method returns a UriInterface object |
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* If the first argument is a Psr7UriInterface the method returns a Psr7UriInterface object |
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* |
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* @param Psr7UriInterface|UriInterface $uri |
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* @param Psr7UriInterface|UriInterface $base_uri |
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* |
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* @return Psr7UriInterface|UriInterface |
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*/ |
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public static function resolve($uri, $base_uri) |
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{ |
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self::filterUri($uri); |
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self::filterUri($base_uri); |
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$null = $uri instanceof Psr7UriInterface ? '' : null; |
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|
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if ($null !== $uri->getScheme()) { |
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return $uri |
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->withPath(self::removeDotSegments($uri->getPath())); |
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} |
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|
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if ($null !== $uri->getAuthority()) { |
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return $uri |
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->withScheme($base_uri->getScheme()) |
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->withPath(self::removeDotSegments($uri->getPath())); |
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} |
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|
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$user = $null; |
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$pass = null; |
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$userInfo = $base_uri->getUserInfo(); |
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if (null !== $userInfo) { |
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[$user, $pass] = explode(':', $userInfo, 2) + [1 => null]; |
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} |
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|
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[$uri_path, $uri_query] = self::resolvePathAndQuery($uri, $base_uri); |
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|
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return $uri |
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->withPath(self::removeDotSegments($uri_path)) |
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->withQuery($uri_query) |
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->withHost($base_uri->getHost()) |
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->withPort($base_uri->getPort()) |
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->withUserInfo((string) $user, $pass) |
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->withScheme($base_uri->getScheme()) |
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; |
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} |
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|
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/** |
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* Filter the URI object. |
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* |
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* @param mixed $uri an URI object |
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* |
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* @throws \TypeError if the URI object does not implements the supported interfaces. |
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*/ |
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private static function filterUri($uri): void |
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{ |
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if (!$uri instanceof UriInterface && !$uri instanceof Psr7UriInterface) { |
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throw new \TypeError(sprintf('The uri must be a valid URI object received `%s`', gettype($uri))); |
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} |
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} |
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|
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/** |
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* Remove dot segments from the URI path. |
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*/ |
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private static function removeDotSegments(string $path): string |
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{ |
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if (false === strpos($path, '.')) { |
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return $path; |
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} |
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|
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$old_segments = explode('/', $path); |
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$new_path = implode('/', array_reduce($old_segments, [UriResolver::class, 'reducer'], [])); |
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if (isset(self::DOT_SEGMENTS[end($old_segments)])) { |
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$new_path .= '/'; |
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} |
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|
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// @codeCoverageIgnoreStart |
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// added because some PSR-7 implementations do not respect RFC3986 |
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if (0 === strpos($path, '/') && 0 !== strpos($new_path, '/')) { |
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return '/'.$new_path; |
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} |
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// @codeCoverageIgnoreEnd |
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|
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return $new_path; |
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} |
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|
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/** |
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* Remove dot segments. |
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* |
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* @return array<int, string> |
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*/ |
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private static function reducer(array $carry, string $segment): array |
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{ |
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if ('..' === $segment) { |
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array_pop($carry); |
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|
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return $carry; |
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} |
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|
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if (!isset(self::DOT_SEGMENTS[$segment])) { |
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$carry[] = $segment; |
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} |
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|
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return $carry; |
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} |
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|
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/** |
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* Resolve an URI path and query component. |
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* |
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* @param Psr7UriInterface|UriInterface $uri |
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* @param Psr7UriInterface|UriInterface $base_uri |
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* |
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* @return array{0:string, 1:string|null} |
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*/ |
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private static function resolvePathAndQuery($uri, $base_uri): array |
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{ |
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$target_path = $uri->getPath(); |
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$target_query = $uri->getQuery(); |
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$null = $uri instanceof Psr7UriInterface ? '' : null; |
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$baseNull = $base_uri instanceof Psr7UriInterface ? '' : null; |
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|
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if (0 === strpos($target_path, '/')) { |
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return [$target_path, $target_query]; |
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} |
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|
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if ('' === $target_path) { |
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if ($null === $target_query) { |
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$target_query = $base_uri->getQuery(); |
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} |
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|
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$target_path = $base_uri->getPath(); |
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//@codeCoverageIgnoreStart |
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//because some PSR-7 Uri implementations allow this RFC3986 forbidden construction |
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if ($baseNull !== $base_uri->getAuthority() && 0 !== strpos($target_path, '/')) { |
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$target_path = '/'.$target_path; |
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} |
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//@codeCoverageIgnoreEnd |
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|
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return [$target_path, $target_query]; |
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} |
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|
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$base_path = $base_uri->getPath(); |
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if ($baseNull !== $base_uri->getAuthority() && '' === $base_path) { |
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$target_path = '/'.$target_path; |
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} |
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|
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if ('' !== $base_path) { |
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$segments = explode('/', $base_path); |
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array_pop($segments); |
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if ([] !== $segments) { |
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$target_path = implode('/', $segments).'/'.$target_path; |
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} |
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} |
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|
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return [$target_path, $target_query]; |
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} |
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|
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/** |
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* Relativize an URI according to a base URI. |
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* |
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* This method MUST retain the state of the submitted URI instance, and return |
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* an URI instance of the same type that contains the applied modifications. |
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* |
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* This method MUST be transparent when dealing with error and exceptions. |
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* It MUST not alter of silence them apart from validating its own parameters. |
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* |
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* @param Psr7UriInterface|UriInterface $uri |
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* @param Psr7UriInterface|UriInterface $base_uri |
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* |
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* @return Psr7UriInterface|UriInterface |
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*/ |
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public static function relativize($uri, $base_uri) |
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{ |
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self::filterUri($uri); |
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self::filterUri($base_uri); |
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$uri = self::formatHost($uri); |
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$base_uri = self::formatHost($base_uri); |
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if (!self::isRelativizable($uri, $base_uri)) { |
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return $uri; |
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} |
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|
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$null = $uri instanceof Psr7UriInterface ? '' : null; |
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$uri = $uri->withScheme($null)->withPort(null)->withUserInfo($null)->withHost($null); |
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$target_path = $uri->getPath(); |
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if ($target_path !== $base_uri->getPath()) { |
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return $uri->withPath(self::relativizePath($target_path, $base_uri->getPath())); |
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} |
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|
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if (self::componentEquals('getQuery', $uri, $base_uri)) { |
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return $uri->withPath('')->withQuery($null); |
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} |
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|
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if ($null === $uri->getQuery()) { |
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return $uri->withPath(self::formatPathWithEmptyBaseQuery($target_path)); |
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} |
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|
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return $uri->withPath(''); |
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} |
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|
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/** |
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* Tells whether the component value from both URI object equals. |
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* |
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* @param Psr7UriInterface|UriInterface $uri |
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* @param Psr7UriInterface|UriInterface $base_uri |
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*/ |
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private static function componentEquals(string $method, $uri, $base_uri): bool |
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{ |
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return self::getComponent($method, $uri) === self::getComponent($method, $base_uri); |
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} |
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|
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/** |
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* Returns the component value from the submitted URI object. |
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* |
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* @param Psr7UriInterface|UriInterface $uri |
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*/ |
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private static function getComponent(string $method, $uri): ?string |
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{ |
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$component = $uri->$method(); |
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if ($uri instanceof Psr7UriInterface && '' === $component) { |
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return null; |
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} |
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|
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return $component; |
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} |
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|
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/** |
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* Filter the URI object. |
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* |
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* @param null|mixed $uri |
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* |
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* @throws \TypeError if the URI object does not implements the supported interfaces. |
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* |
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* @return Psr7UriInterface|UriInterface |
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*/ |
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private static function formatHost($uri) |
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{ |
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if (!$uri instanceof Psr7UriInterface) { |
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return $uri; |
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} |
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|
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$host = $uri->getHost(); |
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if ('' === $host) { |
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return $uri; |
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} |
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|
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return $uri->withHost((string) Uri::createFromComponents(['host' => $host])->getHost()); |
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} |
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|
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/** |
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* Tell whether the submitted URI object can be relativize. |
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* |
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* @param Psr7UriInterface|UriInterface $uri |
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* @param Psr7UriInterface|UriInterface $base_uri |
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*/ |
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private static function isRelativizable($uri, $base_uri): bool |
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{ |
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return !UriInfo::isRelativePath($uri) |
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&& self::componentEquals('getScheme', $uri, $base_uri) |
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&& self::componentEquals('getAuthority', $uri, $base_uri); |
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} |
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|
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/** |
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* Relative the URI for a authority-less target URI. |
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*/ |
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private static function relativizePath(string $path, string $basepath): string |
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{ |
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$base_segments = self::getSegments($basepath); |
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$target_segments = self::getSegments($path); |
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$target_basename = array_pop($target_segments); |
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array_pop($base_segments); |
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foreach ($base_segments as $offset => $segment) { |
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if (!isset($target_segments[$offset]) || $segment !== $target_segments[$offset]) { |
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break; |
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} |
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unset($base_segments[$offset], $target_segments[$offset]); |
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} |
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$target_segments[] = $target_basename; |
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|
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return self::formatPath( |
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str_repeat('../', count($base_segments)).implode('/', $target_segments), |
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$basepath |
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); |
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} |
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|
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/** |
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* returns the path segments. |
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* |
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* @return string[] |
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*/ |
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private static function getSegments(string $path): array |
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{ |
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if ('' !== $path && '/' === $path[0]) { |
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$path = substr($path, 1); |
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} |
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|
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return explode('/', $path); |
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} |
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|
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/** |
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* Formatting the path to keep a valid URI. |
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*/ |
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private static function formatPath(string $path, string $basepath): string |
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{ |
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if ('' === $path) { |
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return in_array($basepath, ['', '/'], true) ? $basepath : './'; |
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} |
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|
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if (false === ($colon_pos = strpos($path, ':'))) { |
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return $path; |
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} |
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|
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$slash_pos = strpos($path, '/'); |
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if (false === $slash_pos || $colon_pos < $slash_pos) { |
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return "./$path"; |
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} |
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|
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return $path; |
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} |
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|
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/** |
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* Formatting the path to keep a resolvable URI. |
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*/ |
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private static function formatPathWithEmptyBaseQuery(string $path): string |
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{ |
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$target_segments = self::getSegments($path); |
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/** @var string $basename */ |
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$basename = end($target_segments); |
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|
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return '' === $basename ? './' : $basename; |
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} |
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} |
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|
