137 lines
3.5 KiB
PHP
137 lines
3.5 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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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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namespace Symfony\Component\DomCrawler;
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/**
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* The UriResolver class takes an URI (relative, absolute, fragment, etc.)
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* and turns it into an absolute URI against another given base URI.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Grégoire Pineau <lyrixx@lyrixx.info>
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*/
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class UriResolver
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{
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/**
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* Resolves a URI according to a base URI.
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*
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* For example if $uri=/foo/bar and $baseUri=https://symfony.com it will
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* return https://symfony.com/foo/bar
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*
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* If the $uri is not absolute you must pass an absolute $baseUri
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*/
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public static function resolve(string $uri, ?string $baseUri): string
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{
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$uri = trim($uri);
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// absolute URL?
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if (null !== parse_url($uri, \PHP_URL_SCHEME)) {
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return $uri;
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}
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if (null === $baseUri) {
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throw new \InvalidArgumentException('The URI is relative, so you must define its base URI passing an absolute URL.');
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}
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// empty URI
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if (!$uri) {
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return $baseUri;
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}
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// an anchor
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if ('#' === $uri[0]) {
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return self::cleanupAnchor($baseUri).$uri;
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}
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$baseUriCleaned = self::cleanupUri($baseUri);
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if ('?' === $uri[0]) {
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return $baseUriCleaned.$uri;
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}
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// absolute URL with relative schema
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if (str_starts_with($uri, '//')) {
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return preg_replace('#^([^/]*)//.*$#', '$1', $baseUriCleaned).$uri;
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}
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$baseUriCleaned = preg_replace('#^(.*?//[^/]*)(?:\/.*)?$#', '$1', $baseUriCleaned);
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// absolute path
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if ('/' === $uri[0]) {
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return $baseUriCleaned.$uri;
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}
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// relative path
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$path = parse_url(substr($baseUri, \strlen($baseUriCleaned)), \PHP_URL_PATH);
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$path = self::canonicalizePath(substr($path, 0, strrpos($path, '/')).'/'.$uri);
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return $baseUriCleaned.('' === $path || '/' !== $path[0] ? '/' : '').$path;
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}
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/**
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* Returns the canonicalized URI path (see RFC 3986, section 5.2.4).
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*/
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private static function canonicalizePath(string $path): string
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{
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if ('' === $path || '/' === $path) {
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return $path;
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}
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if (str_ends_with($path, '.')) {
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$path .= '/';
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}
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$output = [];
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foreach (explode('/', $path) as $segment) {
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if ('..' === $segment) {
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array_pop($output);
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} elseif ('.' !== $segment) {
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$output[] = $segment;
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}
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}
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return implode('/', $output);
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}
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/**
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* Removes the query string and the anchor from the given uri.
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*/
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private static function cleanupUri(string $uri): string
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{
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return self::cleanupQuery(self::cleanupAnchor($uri));
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}
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/**
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* Removes the query string from the uri.
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*/
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private static function cleanupQuery(string $uri): string
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{
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if (false !== $pos = strpos($uri, '?')) {
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return substr($uri, 0, $pos);
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}
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return $uri;
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}
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/**
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* Removes the anchor from the uri.
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*/
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private static function cleanupAnchor(string $uri): string
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{
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if (false !== $pos = strpos($uri, '#')) {
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return substr($uri, 0, $pos);
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}
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return $uri;
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}
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}
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