<?php
declare(strict_types=1);
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
*
* @see https://datatracker.ietf.org/doc/html/rfc3986#section-5
*/
final class UriResolver
{
/**
* Removes dot segments from a path and returns the new path.
*
* @see https://datatracker.ietf.org/doc/html/rfc3986#section-5.2.4
*/
public static function removeDotSegments(string $path): string
{
if ($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.
*
* @see https://datatracker.ietf.org/doc/html/rfc3986#section-5.2
*/
public static function resolve(UriInterface $base, UriInterface $rel): UriInterface
{
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
*/
public static function relativize(UriInterface $base, UriInterface $target): UriInterface
{
if ($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());
/** @var string $lastSegment */
$lastSegment = end($segments);
return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
}
return $emptyPathUri;
}
private static function getRelativePath(UriInterface $base, UriInterface $target): string
{
$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
}
}
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