UriResolver.php — Tutor LMS – eLearning and online course solution trunk

tutor / ecommerce / PaymentGateways / Paypal / vendor / guzzlehttp / psr7 / src / UriResolver.php

tutor / ecommerce / PaymentGateways / Paypal / vendor / guzzlehttp / psr7 / src Last commit date

UriResolver.php

208 lines

1	<?php
2
3	declare(strict_types=1);
4
5	namespace GuzzleHttp\Psr7;
6
7	use Psr\Http\Message\UriInterface;
8
9	/**
10	* Resolves a URI reference in the context of a base URI and the opposite way.
11	*
12	* @author Tobias Schultze
13	*
14	* @see https://datatracker.ietf.org/doc/html/rfc3986#section-5
15	*/
16	final class UriResolver
17	{
18	/**
19	* Removes dot segments from a path and returns the new path.
20	*
21	* @see https://datatracker.ietf.org/doc/html/rfc3986#section-5.2.4
22	*/
23	public static function removeDotSegments(string $path): string
24	{
25	if ($path === '' \|\| $path === '/') {
26	return $path;
27	}
28
29	$results = [];
30	$segments = explode('/', $path);
31	foreach ($segments as $segment) {
32	if ($segment === '..') {
33	array_pop($results);
34	} elseif ($segment !== '.') {
35	$results[] = $segment;
36	}
37	}
38
39	$newPath = implode('/', $results);
40
41	if ($path[0] === '/' && (!isset($newPath[0]) \|\| $newPath[0] !== '/')) {
42	// Re-add the leading slash if necessary for cases like "/.."
43	$newPath = '/'.$newPath;
44	} elseif ($newPath !== '' && ($segment === '.' \|\| $segment === '..')) {
45	// Add the trailing slash if necessary
46	// If newPath is not empty, then $segment must be set and is the last segment from the foreach
47	$newPath .= '/';
48	}
49
50	return $newPath;
51	}
52
53	/**
54	* Converts the relative URI into a new URI that is resolved against the base URI.
55	*
56	* @see https://datatracker.ietf.org/doc/html/rfc3986#section-5.2
57	*/
58	public static function resolve(UriInterface $base, UriInterface $rel): UriInterface
59	{
60	if ((string) $rel === '') {
61	// we can simply return the same base URI instance for this same-document reference
62	return $base;
63	}
64
65	if ($rel->getScheme() != '') {
66	return $rel->withPath(self::removeDotSegments($rel->getPath()));
67	}
68
69	if ($rel->getAuthority() != '') {
70	return $rel
71	->withScheme($base->getScheme())
72	->withPath(self::removeDotSegments($rel->getPath()));
73	}
74
75	if ($rel->getPath() === '') {
76	$targetPath = $base->getPath();
77	$targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
78	} else {
79	if ($rel->getPath()[0] === '/') {
80	$targetPath = $rel->getPath();
81	} else {
82	if ($base->getAuthority() != '' && $base->getPath() === '') {
83	$targetPath = '/'.$rel->getPath();
84	} else {
85	$lastSlashPos = strrpos($base->getPath(), '/');
86	if ($lastSlashPos === false) {
87	$targetPath = $rel->getPath();
88	} else {
89	$targetPath = substr($base->getPath(), 0, $lastSlashPos + 1).$rel->getPath();
90	}
91	}
92	}
93	$targetPath = self::removeDotSegments($targetPath);
94	$targetQuery = $rel->getQuery();
95	}
96
97	return $base
98	->withPath($targetPath)
99	->withQuery($targetQuery)
100	->withFragment($rel->getFragment());
101	}
102
103	/**
104	* Returns the target URI as a relative reference from the base URI.
105	*
106	* This method is the counterpart to resolve():
107	*
108	* (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
109	*
110	* One use-case is to use the current request URI as base URI and then generate relative links in your documents
111	* to reduce the document size or offer self-contained downloadable document archives.
112	*
113	* $base = new Uri('http://example.com/a/b/');
114	* echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c')); // prints 'c'.
115	* echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y')); // prints '../x/y'.
116	* echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
117	* echo UriResolver::relativize($base, new Uri('http://example.org/a/b/')); // prints '//example.org/a/b/'.
118	*
119	* This method also accepts a target that is already relative and will try to relativize it further. Only a
120	* relative-path reference will be returned as-is.
121	*
122	* echo UriResolver::relativize($base, new Uri('/a/b/c')); // prints 'c' as well
123	*/
124	public static function relativize(UriInterface $base, UriInterface $target): UriInterface
125	{
126	if ($target->getScheme() !== ''
127	&& ($base->getScheme() !== $target->getScheme() \|\| $target->getAuthority() === '' && $base->getAuthority() !== '')
128	) {
129	return $target;
130	}
131
132	if (Uri::isRelativePathReference($target)) {
133	// As the target is already highly relative we return it as-is. It would be possible to resolve
134	// the target with `$target = self::resolve($base, $target);` and then try make it more relative
135	// by removing a duplicate query. But let's not do that automatically.
136	return $target;
137	}
138
139	if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
140	return $target->withScheme('');
141	}
142
143	// We must remove the path before removing the authority because if the path starts with two slashes, the URI
144	// would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
145	// invalid.
146	$emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
147
148	if ($base->getPath() !== $target->getPath()) {
149	return $emptyPathUri->withPath(self::getRelativePath($base, $target));
150	}
151
152	if ($base->getQuery() === $target->getQuery()) {
153	// Only the target fragment is left. And it must be returned even if base and target fragment are the same.
154	return $emptyPathUri->withQuery('');
155	}
156
157	// If the base URI has a query but the target has none, we cannot return an empty path reference as it would
158	// inherit the base query component when resolving.
159	if ($target->getQuery() === '') {
160	$segments = explode('/', $target->getPath());
161	/** @var string $lastSegment */
162	$lastSegment = end($segments);
163
164	return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
165	}
166
167	return $emptyPathUri;
168	}
169
170	private static function getRelativePath(UriInterface $base, UriInterface $target): string
171	{
172	$sourceSegments = explode('/', $base->getPath());
173	$targetSegments = explode('/', $target->getPath());
174	array_pop($sourceSegments);
175	$targetLastSegment = array_pop($targetSegments);
176	foreach ($sourceSegments as $i => $segment) {
177	if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
178	unset($sourceSegments[$i], $targetSegments[$i]);
179	} else {
180	break;
181	}
182	}
183	$targetSegments[] = $targetLastSegment;
184	$relativePath = str_repeat('../', count($sourceSegments)).implode('/', $targetSegments);
185
186	// A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
187	// This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
188	// as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
189	if ('' === $relativePath \|\| false !== strpos(explode('/', $relativePath, 2)[0], ':')) {
190	$relativePath = "./$relativePath";
191	} elseif ('/' === $relativePath[0]) {
192	if ($base->getAuthority() != '' && $base->getPath() === '') {
193	// In this case an extra slash is added by resolve() automatically. So we must not add one here.
194	$relativePath = ".$relativePath";
195	} else {
196	$relativePath = "./$relativePath";
197	}
198	}
199
200	return $relativePath;
201	}
202
203	private function __construct()
204	{
205	// cannot be instantiated
206	}
207	}
208