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<?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 <[email protected]> |
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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 <[email protected]> |
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* @author Claudio Zizza <[email protected]> |
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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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