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UriResolver.php
001 <?php
002
003 namespace GuzzleHttp\Psr7;
004
005 use Psr\Http\Message\UriInterface;
006
007 /**
008 * Resolves a URI reference in the context of a base URI and the opposite way.
009 *
010 * @author Tobias Schultze
011 *
012 * @link https://tools.ietf.org/html/rfc3986#section-5
013 */
014 final class UriResolver
015 {
016 /**
017 * Removes dot segments from a path and returns the new path.
018 *
019 * @param string $path
020 *
021 * @return string
022 *
023 * @link http://tools.ietf.org/html/rfc3986#section-5.2.4
024 */
025 public static function removeDotSegments($path)
026 {
027 if ($path === '' || $path === '/') {
028 return $path;
029 }
030
031 $results = [];
032 $segments = explode('/', $path);
033 foreach ($segments as $segment) {
034 if ($segment === '..') {
035 array_pop($results);
036 } elseif ($segment !== '.') {
037 $results[] = $segment;
038 }
039 }
040
041 $newPath = implode('/', $results);
042
043 if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {
044 // Re-add the leading slash if necessary for cases like "/.."
045 $newPath = '/' . $newPath;
046 } elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {
047 // Add the trailing slash if necessary
048 // If newPath is not empty, then $segment must be set and is the last segment from the foreach
049 $newPath .= '/';
050 }
051
052 return $newPath;
053 }
054
055 /**
056 * Converts the relative URI into a new URI that is resolved against the base URI.
057 *
058 * @param UriInterface $base Base URI
059 * @param UriInterface $rel Relative URI
060 *
061 * @return UriInterface
062 *
063 * @link http://tools.ietf.org/html/rfc3986#section-5.2
064 */
065 public static function resolve(UriInterface $base, UriInterface $rel)
066 {
067 if ((string) $rel === '') {
068 // we can simply return the same base URI instance for this same-document reference
069 return $base;
070 }
071
072 if ($rel->getScheme() != '') {
073 return $rel->withPath(self::removeDotSegments($rel->getPath()));
074 }
075
076 if ($rel->getAuthority() != '') {
077 $targetAuthority = $rel->getAuthority();
078 $targetPath = self::removeDotSegments($rel->getPath());
079 $targetQuery = $rel->getQuery();
080 } else {
081 $targetAuthority = $base->getAuthority();
082 if ($rel->getPath() === '') {
083 $targetPath = $base->getPath();
084 $targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
085 } else {
086 if ($rel->getPath()[0] === '/') {
087 $targetPath = $rel->getPath();
088 } else {
089 if ($targetAuthority != '' && $base->getPath() === '') {
090 $targetPath = '/' . $rel->getPath();
091 } else {
092 $lastSlashPos = strrpos($base->getPath(), '/');
093 if ($lastSlashPos === false) {
094 $targetPath = $rel->getPath();
095 } else {
096 $targetPath = substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();
097 }
098 }
099 }
100 $targetPath = self::removeDotSegments($targetPath);
101 $targetQuery = $rel->getQuery();
102 }
103 }
104
105 return new Uri(Uri::composeComponents(
106 $base->getScheme(),
107 $targetAuthority,
108 $targetPath,
109 $targetQuery,
110 $rel->getFragment()
111 ));
112 }
113
114 /**
115 * Returns the target URI as a relative reference from the base URI.
116 *
117 * This method is the counterpart to resolve():
118 *
119 * (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
120 *
121 * One use-case is to use the current request URI as base URI and then generate relative links in your documents
122 * to reduce the document size or offer self-contained downloadable document archives.
123 *
124 * $base = new Uri('http://example.com/a/b/');
125 * echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c')); // prints 'c'.
126 * echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y')); // prints '../x/y'.
127 * echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
128 * echo UriResolver::relativize($base, new Uri('http://example.org/a/b/')); // prints '//example.org/a/b/'.
129 *
130 * This method also accepts a target that is already relative and will try to relativize it further. Only a
131 * relative-path reference will be returned as-is.
132 *
133 * echo UriResolver::relativize($base, new Uri('/a/b/c')); // prints 'c' as well
134 *
135 * @param UriInterface $base Base URI
136 * @param UriInterface $target Target URI
137 *
138 * @return UriInterface The relative URI reference
139 */
140 public static function relativize(UriInterface $base, UriInterface $target)
141 {
142 if ($target->getScheme() !== '' &&
143 ($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')
144 ) {
145 return $target;
146 }
147
148 if (Uri::isRelativePathReference($target)) {
149 // As the target is already highly relative we return it as-is. It would be possible to resolve
150 // the target with `$target = self::resolve($base, $target);` and then try make it more relative
151 // by removing a duplicate query. But let's not do that automatically.
152 return $target;
153 }
154
155 if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
156 return $target->withScheme('');
157 }
158
159 // We must remove the path before removing the authority because if the path starts with two slashes, the URI
160 // would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
161 // invalid.
162 $emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
163
164 if ($base->getPath() !== $target->getPath()) {
165 return $emptyPathUri->withPath(self::getRelativePath($base, $target));
166 }
167
168 if ($base->getQuery() === $target->getQuery()) {
169 // Only the target fragment is left. And it must be returned even if base and target fragment are the same.
170 return $emptyPathUri->withQuery('');
171 }
172
173 // If the base URI has a query but the target has none, we cannot return an empty path reference as it would
174 // inherit the base query component when resolving.
175 if ($target->getQuery() === '') {
176 $segments = explode('/', $target->getPath());
177 $lastSegment = end($segments);
178
179 return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
180 }
181
182 return $emptyPathUri;
183 }
184
185 private static function getRelativePath(UriInterface $base, UriInterface $target)
186 {
187 $sourceSegments = explode('/', $base->getPath());
188 $targetSegments = explode('/', $target->getPath());
189 array_pop($sourceSegments);
190 $targetLastSegment = array_pop($targetSegments);
191 foreach ($sourceSegments as $i => $segment) {
192 if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
193 unset($sourceSegments[$i], $targetSegments[$i]);
194 } else {
195 break;
196 }
197 }
198 $targetSegments[] = $targetLastSegment;
199 $relativePath = str_repeat('../', count($sourceSegments)) . implode('/', $targetSegments);
200
201 // A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
202 // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
203 // as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
204 if ('' === $relativePath || false !== strpos(explode('/', $relativePath, 2)[0], ':')) {
205 $relativePath = "./$relativePath";
206 } elseif ('/' === $relativePath[0]) {
207 if ($base->getAuthority() != '' && $base->getPath() === '') {
208 // In this case an extra slash is added by resolve() automatically. So we must not add one here.
209 $relativePath = ".$relativePath";
210 } else {
211 $relativePath = "./$relativePath";
212 }
213 }
214
215 return $relativePath;
216 }
217
218 private function __construct()
219 {
220 // cannot be instantiated
221 }
222 }
223