112 lines
3 KiB
PHP
112 lines
3 KiB
PHP
<?php
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/*
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* This file is part of the webmozart/path-util package.
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*
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* (c) Bernhard Schussek <bschussek@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Webmozart\PathUtil;
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use InvalidArgumentException;
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use Webmozart\Assert\Assert;
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/**
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* Contains utility methods for handling URL strings.
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*
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* The methods in this class are able to deal with URLs.
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*
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* @since 2.3
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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* @author Claudio Zizza <claudio@budgegeria.de>
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*/
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final class Url
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{
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/**
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* Turns a URL into a relative path.
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*
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* The result is a canonical path. This class is using functionality of Path class.
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*
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* @see Path
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*
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* @param string $url A URL to make relative.
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* @param string $baseUrl A base URL.
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*
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* @return string
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*
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* @throws InvalidArgumentException If the URL and base URL does
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* not match.
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*/
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public static function makeRelative($url, $baseUrl)
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{
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Assert::string($url, 'The URL must be a string. Got: %s');
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Assert::string($baseUrl, 'The base URL must be a string. Got: %s');
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Assert::contains($baseUrl, '://', '%s is not an absolute Url.');
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list($baseHost, $basePath) = self::split($baseUrl);
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if (false === strpos($url, '://')) {
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if (0 === strpos($url, '/')) {
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$host = $baseHost;
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} else {
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$host = '';
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}
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$path = $url;
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} else {
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list($host, $path) = self::split($url);
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}
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if ('' !== $host && $host !== $baseHost) {
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throw new InvalidArgumentException(sprintf(
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'The URL "%s" cannot be made relative to "%s" since their host names are different.',
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$host,
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$baseHost
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));
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}
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return Path::makeRelative($path, $basePath);
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}
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/**
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* Splits a URL into its host and the path.
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*
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* ```php
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* list ($root, $path) = Path::split("http://example.com/webmozart")
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* // => array("http://example.com", "/webmozart")
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*
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* list ($root, $path) = Path::split("http://example.com")
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* // => array("http://example.com", "")
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* ```
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*
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* @param string $url The URL to split.
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*
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* @return string[] An array with the host and the path of the URL.
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*
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* @throws InvalidArgumentException If $url is not a URL.
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*/
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private static function split($url)
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{
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$pos = strpos($url, '://');
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$scheme = substr($url, 0, $pos + 3);
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$url = substr($url, $pos + 3);
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if (false !== ($pos = strpos($url, '/'))) {
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$host = substr($url, 0, $pos);
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$url = substr($url, $pos);
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} else {
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// No path, only host
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$host = $url;
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$url = '/';
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}
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// At this point, we have $scheme, $host and $path
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$root = $scheme.$host;
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return array($root, $url);
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}
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}
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