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