<?php

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\UriInterface;

/**
 * Provides methods to determine if a modified URL should be considered cross-origin.
 *
 * @author Graham Campbell
 */
final class UriComparator
{
    /**
     * Determines if a modified URL should be considered cross-origin with
     * respect to an original URL.
     *
     * @return bool
     */
    public static function isCrossOrigin(UriInterface $original, UriInterface $modified)
    {
        if (\strcasecmp($original->getHost(), $modified->getHost()) !== 0) {
            return true;
        }

        if ($original->getScheme() !== $modified->getScheme()) {
            return true;
        }

        if (self::computePort($original) !== self::computePort($modified)) {
            return true;
        }

        return false;
    }

    /**
     * @return int
     */
    private static function computePort(UriInterface $uri)
    {
        $port = $uri->getPort();

        if (null !== $port) {
            return $port;
        }

        return 'https' === $uri->getScheme() ? 443 : 80;
    }

    private function __construct()
    {
        // cannot be instantiated
    }
}
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