<?php

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namespace GuzzleHttp\Psr7;

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use Psr\Http\Message\UriInterface;

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/**

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* Resolves a URI reference in the context of a base URI and the opposite way.

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*

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* @author Tobias Schultze

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*

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* @link https://tools.ietf.org/html/rfc3986#section-5

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*/

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final class UriResolver

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{

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/**

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* Removes dot segments from a path and returns the new path.

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*

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* @param string $path

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*

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* @return string

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*

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* @link http://tools.ietf.org/html/rfc3986#section-5.2.4

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*/

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public static function removeDotSegments($path)

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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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$results = [];

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$segments = explode('/', $path);

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foreach ($segments as $segment) {

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if ($segment === '..') {

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array_pop($results);

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} elseif ($segment !== '.') {

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$results[] = $segment;

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}

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}

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$newPath = implode('/', $results);

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if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {

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// Re-add the leading slash if necessary for cases like "/.."

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$newPath = '/' . $newPath;

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} elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {

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// Add the trailing slash if necessary

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// If newPath is not empty, then $segment must be set and is the last segment from the foreach

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$newPath .= '/';

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}

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return $newPath;

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}

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/**

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* Converts the relative URI into a new URI that is resolved against the base URI.

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*

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* @param UriInterface $base Base URI

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* @param UriInterface $rel Relative URI

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*

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* @return UriInterface

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*

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* @link http://tools.ietf.org/html/rfc3986#section-5.2

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*/

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public static function resolve(UriInterface $base, UriInterface $rel)

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{

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if ((string) $rel === '') {

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// we can simply return the same base URI instance for this same-document reference

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return $base;

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}

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if ($rel->getScheme() != '') {

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return $rel->withPath(self::removeDotSegments($rel->getPath()));

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}

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if ($rel->getAuthority() != '') {

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$targetAuthority = $rel->getAuthority();

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$targetPath = self::removeDotSegments($rel->getPath());

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$targetQuery = $rel->getQuery();

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} else {

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$targetAuthority = $base->getAuthority();

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if ($rel->getPath() === '') {

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$targetPath = $base->getPath();

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$targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();

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} else {

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if ($rel->getPath()[0] === '/') {

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$targetPath = $rel->getPath();

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} else {

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if ($targetAuthority != '' && $base->getPath() === '') {

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$targetPath = '/' . $rel->getPath();

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} else {

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$lastSlashPos = strrpos($base->getPath(), '/');

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if ($lastSlashPos === false) {

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$targetPath = $rel->getPath();

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} else {

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$targetPath = substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();

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}

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}

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}

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$targetPath = self::removeDotSegments($targetPath);

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$targetQuery = $rel->getQuery();

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}

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}

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return new Uri(Uri::composeComponents(

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$base->getScheme(),

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$targetAuthority,

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$targetPath,

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$targetQuery,

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$rel->getFragment()

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));

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}

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/**

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* Returns the target URI as a relative reference from the base URI.

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*

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* This method is the counterpart to resolve():

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*

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* (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))

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*

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* One use-case is to use the current request URI as base URI and then generate relative links in your documents

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* to reduce the document size or offer self-contained downloadable document archives.

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*

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* $base = new Uri('http://example.com/a/b/');

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* echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c')); // prints 'c'.

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* echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y')); // prints '../x/y'.

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* echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.

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* echo UriResolver::relativize($base, new Uri('http://example.org/a/b/')); // prints '//example.org/a/b/'.

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*

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* This method also accepts a target that is already relative and will try to relativize it further. Only a

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* relative-path reference will be returned as-is.

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*

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* echo UriResolver::relativize($base, new Uri('/a/b/c')); // prints 'c' as well

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*

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* @param UriInterface $base Base URI

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* @param UriInterface $target Target URI

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*

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* @return UriInterface The relative URI reference

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*/

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public static function relativize(UriInterface $base, UriInterface $target)

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{

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if ($target->getScheme() !== '' &&

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($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')

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) {

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return $target;

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}

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if (Uri::isRelativePathReference($target)) {

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// As the target is already highly relative we return it as-is. It would be possible to resolve

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// the target with `$target = self::resolve($base, $target);` and then try make it more relative

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// by removing a duplicate query. But let's not do that automatically.

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return $target;

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}

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if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {

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return $target->withScheme('');

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}

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// We must remove the path before removing the authority because if the path starts with two slashes, the URI

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// would turn invalid. And we also cannot set a relative path before removing the authority, as that is also

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// invalid.

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$emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');

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if ($base->getPath() !== $target->getPath()) {

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return $emptyPathUri->withPath(self::getRelativePath($base, $target));

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}

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if ($base->getQuery() === $target->getQuery()) {

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// Only the target fragment is left. And it must be returned even if base and target fragment are the same.

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return $emptyPathUri->withQuery('');

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}

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// If the base URI has a query but the target has none, we cannot return an empty path reference as it would

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// inherit the base query component when resolving.

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if ($target->getQuery() === '') {

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$segments = explode('/', $target->getPath());

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$lastSegment = end($segments);

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return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);

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}

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return $emptyPathUri;

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}

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private static function getRelativePath(UriInterface $base, UriInterface $target)

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{

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$sourceSegments = explode('/', $base->getPath());

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$targetSegments = explode('/', $target->getPath());

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array_pop($sourceSegments);

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$targetLastSegment = array_pop($targetSegments);

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foreach ($sourceSegments as $i => $segment) {

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if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {

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unset($sourceSegments[$i], $targetSegments[$i]);

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} else {

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break;

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}

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}

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$targetSegments[] = $targetLastSegment;

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$relativePath = str_repeat('../', count($sourceSegments)) . implode('/', $targetSegments);

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// A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".

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// This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used

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// as the first segment of a relative-path reference, as it would be mistaken for a scheme name.

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if ('' === $relativePath || false !== strpos(explode('/', $relativePath, 2)[0], ':')) {

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$relativePath = "./$relativePath";

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} elseif ('/' === $relativePath[0]) {

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if ($base->getAuthority() != '' && $base->getPath() === '') {

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// In this case an extra slash is added by resolve() automatically. So we must not add one here.

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$relativePath = ".$relativePath";

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} else {

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$relativePath = "./$relativePath";

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}

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}

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return $relativePath;

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}

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private function __construct()

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{

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// cannot be instantiated

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}

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}

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