--- /dev/null
+<?php
+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
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-5
+ */
+final class UriResolver
+{
+ /**
+ * Removes dot segments from a path and returns the new path.
+ *
+ * @param string $path
+ *
+ * @return string
+ * @link http://tools.ietf.org/html/rfc3986#section-5.2.4
+ */
+ public static function removeDotSegments($path)
+ {
+ 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.
+ *
+ * @param UriInterface $base Base URI
+ * @param UriInterface $rel Relative URI
+ *
+ * @return UriInterface
+ * @link http://tools.ietf.org/html/rfc3986#section-5.2
+ */
+ public static function resolve(UriInterface $base, UriInterface $rel)
+ {
+ 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
+ *
+ * @param UriInterface $base Base URI
+ * @param UriInterface $target Target URI
+ *
+ * @return UriInterface The relative URI reference
+ */
+ public static function relativize(UriInterface $base, UriInterface $target)
+ {
+ if ($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());
+ $lastSegment = end($segments);
+
+ return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
+ }
+
+ return $emptyPathUri;
+ }
+
+ private static function getRelativePath(UriInterface $base, UriInterface $target)
+ {
+ $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
+ }
+}
projects / yaffs-website / blobdiff