/usr/share/php/JsonSchema/Uri/UriResolver.php is in php-json-schema 1.6.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* This file is part of the JsonSchema package.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace JsonSchema\Uri;
use JsonSchema\Exception\UriResolverException;
/**
* Resolves JSON Schema URIs
*
* @author Sander Coolen <sander@jibber.nl>
*/
class UriResolver
{
/**
* Parses a URI into five main components
*
* @param string $uri
* @return array
*/
public function parse($uri)
{
preg_match('|^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?|', $uri, $match);
$components = array();
if (5 < count($match)) {
$components = array(
'scheme' => $match[2],
'authority' => $match[4],
'path' => $match[5]
);
}
if (7 < count($match)) {
$components['query'] = $match[7];
}
if (9 < count($match)) {
$components['fragment'] = $match[9];
}
return $components;
}
/**
* Builds a URI based on n array with the main components
*
* @param array $components
* @return string
*/
public function generate(array $components)
{
$uri = $components['scheme'] . '://'
. $components['authority']
. $components['path'];
if (array_key_exists('query', $components)) {
$uri .= $components['query'];
}
if (array_key_exists('fragment', $components)) {
$uri .= '#' . $components['fragment'];
}
return $uri;
}
/**
* Resolves a URI
*
* @param string $uri Absolute or relative
* @param string $baseUri Optional base URI
* @return string Absolute URI
*/
public function resolve($uri, $baseUri = null)
{
if ($uri == '') {
return $baseUri;
}
$components = $this->parse($uri);
$path = $components['path'];
if (! empty($components['scheme'])) {
return $uri;
}
$baseComponents = $this->parse($baseUri);
$basePath = $baseComponents['path'];
$baseComponents['path'] = self::combineRelativePathWithBasePath($path, $basePath);
if (isset($components['fragment'])) {
$baseComponents['fragment'] = $components['fragment'];
}
return $this->generate($baseComponents);
}
/**
* Tries to glue a relative path onto an absolute one
*
* @param string $relativePath
* @param string $basePath
* @return string Merged path
* @throws UriResolverException
*/
public static function combineRelativePathWithBasePath($relativePath, $basePath)
{
$relativePath = self::normalizePath($relativePath);
if ($relativePath == '') {
return $basePath;
}
if ($relativePath{0} == '/') {
return $relativePath;
}
$basePathSegments = explode('/', $basePath);
preg_match('|^/?(\.\./(?:\./)*)*|', $relativePath, $match);
$numLevelUp = strlen($match[0]) /3 + 1;
if ($numLevelUp >= count($basePathSegments)) {
throw new UriResolverException(sprintf("Unable to resolve URI '%s' from base '%s'", $relativePath, $basePath));
}
$basePathSegments = array_slice($basePathSegments, 0, -$numLevelUp);
$path = preg_replace('|^/?(\.\./(\./)*)*|', '', $relativePath);
return implode('/', $basePathSegments) . '/' . $path;
}
/**
* Normalizes a URI path component by removing dot-slash and double slashes
*
* @param string $path
* @return string
*/
private static function normalizePath($path)
{
$path = preg_replace('|((?<!\.)\./)*|', '', $path);
$path = preg_replace('|//|', '/', $path);
return $path;
}
/**
* @param string $uri
* @return boolean
*/
public function isValid($uri)
{
$components = $this->parse($uri);
return !empty($components);
}
}
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