1<?php
2
3declare(strict_types=1);
4
5namespace GuzzleHttp\Psr7;
6
7use Psr\Http\Message\UriInterface;
8
9/**
10 * Provides methods to determine if a modified URL should be considered cross-origin.
11 *
12 * @author Graham Campbell
13 */
14final class UriComparator
15{
16    /**
17     * Determines if a modified URL should be considered cross-origin with
18     * respect to an original URL.
19     */
20    public static function isCrossOrigin(UriInterface $original, UriInterface $modified): bool
21    {
22        if (\strcasecmp($original->getHost(), $modified->getHost()) !== 0) {
23            return true;
24        }
25
26        if ($original->getScheme() !== $modified->getScheme()) {
27            return true;
28        }
29
30        if (self::computePort($original) !== self::computePort($modified)) {
31            return true;
32        }
33
34        return false;
35    }
36
37    private static function computePort(UriInterface $uri): int
38    {
39        $port = $uri->getPort();
40
41        if (null !== $port) {
42            return $port;
43        }
44
45        return 'https' === $uri->getScheme() ? 443 : 80;
46    }
47
48    private function __construct()
49    {
50        // cannot be instantiated
51    }
52}
53