t1gor/Robots.txt-Parser-Class

<?php declare(strict_types=1);

namespace t1gor\RobotsTxtParser\Parser;

use Psr\Log\LoggerAwareInterface;
use t1gor\RobotsTxtParser\LogsIfAvailableTrait;

class Url implements LoggerAwareInterface {

    use LogsIfAvailableTrait;

    protected string $in = '';

    public function __construct(string $in) {
        $this->in = $this->encode(trim($in));
    }

    /**
     * URL encoder according to RFC 3986
     * Returns a string containing the encoded URL with disallowed characters converted to their percentage encodings.
     *
     * @link http://publicmind.in/blog/url-encoding/
     *
     * @param string $url
     *
     * @return string string
     */
    protected function encode(string $url): string {
        $reserved = [
            ':' => '!%3A!ui',
            '/' => '!%2F!ui',
            '?' => '!%3F!ui',
            '#' => '!%23!ui',
            '[' => '!%5B!ui',
            ']' => '!%5D!ui',
            '@' => '!%40!ui',
            '!' => '!%21!ui',
            '$' => '!%24!ui',
            '&' => '!%26!ui',
            "'" => '!%27!ui',
            '(' => '!%28!ui',
            ')' => '!%29!ui',
            '*' => '!%2A!ui',
            '+' => '!%2B!ui',
            ',' => '!%2C!ui',
            ';' => '!%3B!ui',
            '=' => '!%3D!ui',
            '%' => '!%25!ui',
        ];

        return preg_replace(array_values($reserved), array_keys($reserved), rawurlencode($url));
    }

    public static function isValidScheme(string $scheme): bool {
        return in_array($scheme, ['http', 'https', 'ftp', 'sftp']);
    }

    /**
     * Parse URL
     *
     * @param string $url
     *
     * @return array|false
     */
    protected function parse(string $url) {
        $parsed = parse_url($url);

        if ($parsed === false) {
            $this->log("Failed to parse URL from {$url}");

            return false;
        }

        if (!isset($parsed['scheme']) || !static::isValidScheme($parsed['scheme'])) {
            $this->log("URL scheme invalid or missing for {$url}");

            return false;
        }

        if (!isset($parsed['host']) || !HostName::isValid($parsed['host'])) {
            $this->log("URL host invalid or missing for {$url}");

            return false;
        }

        if (!isset($parsed['port'])) {
            $parsed['port'] = getservbyname($parsed['scheme'], 'tcp');

            if (!is_int($parsed['port'])) {
                $this->log("URL port should be a number, {$parsed['port']} found for {$url}");

                return false;
            }
        }

        $parsed['custom'] = ($parsed['path'] ?? '/') . (isset($parsed['query']) ? '?' . $parsed['query'] : '');

        return $parsed;
    }

    public function getPath() {
        $parsed = $this->parse($this->in);

        if ($parsed !== false) {
            return $parsed['custom'];
        }

        return $this->in;
    }
}