<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * RequestMatcher compares a pre-defined set of checks against a Request instance.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class RequestMatcher implements RequestMatcherInterface
{
    private ?string $path = null;
    private ?string $host = null;
    private ?int $port = null;

    /**
     * @var string[]
     */
    private array $methods = [];

    /**
     * @var string[]
     */
    private array $ips = [];

    /**
     * @var string[]
     */
    private array $attributes = [];

    /**
     * @var string[]
     */
    private array $schemes = [];

    /**
     * @param string|string[]|null $methods
     * @param string|string[]|null $ips
     * @param string|string[]|null $schemes
     */
    public function __construct(string $path = null, string $host = null, string|array $methods = null, string|array $ips = null, array $attributes = [], string|array $schemes = null, int $port = null)
    {
        $this->matchPath($path);
        $this->matchHost($host);
        $this->matchMethod($methods);
        $this->matchIps($ips);
        $this->matchScheme($schemes);
        $this->matchPort($port);

        foreach ($attributes as $k => $v) {
            $this->matchAttribute($k, $v);
        }
    }

    /**
     * Adds a check for the HTTP scheme.
     *
     * @param string|string[]|null $scheme An HTTP scheme or an array of HTTP schemes
     */
    public function matchScheme(string|array|null $scheme)
    {
        $this->schemes = null !== $scheme ? array_map('strtolower', (array) $scheme) : [];
    }

    /**
     * Adds a check for the URL host name.
     */
    public function matchHost(?string $regexp)
    {
        $this->host = $regexp;
    }

    /**
     * Adds a check for the the URL port.
     *
     * @param int|null $port The port number to connect to
     */
    public function matchPort(?int $port)
    {
        $this->port = $port;
    }

    /**
     * Adds a check for the URL path info.
     */
    public function matchPath(?string $regexp)
    {
        $this->path = $regexp;
    }

    /**
     * Adds a check for the client IP.
     *
     * @param string $ip A specific IP address or a range specified using IP/netmask like 192.168.1.0/24
     */
    public function matchIp(string $ip)
    {
        $this->matchIps($ip);
    }

    /**
     * Adds a check for the client IP.
     *
     * @param string|string[]|null $ips A specific IP address or a range specified using IP/netmask like 192.168.1.0/24
     */
    public function matchIps(string|array|null $ips)
    {
        $ips = null !== $ips ? (array) $ips : [];

        $this->ips = array_reduce($ips, static function (array $ips, string $ip) {
            return array_merge($ips, preg_split('/\s*,\s*/', $ip));
        }, []);
    }

    /**
     * Adds a check for the HTTP method.
     *
     * @param string|string[]|null $method An HTTP method or an array of HTTP methods
     */
    public function matchMethod(string|array|null $method)
    {
        $this->methods = null !== $method ? array_map('strtoupper', (array) $method) : [];
    }

    /**
     * Adds a check for request attribute.
     */
    public function matchAttribute(string $key, string $regexp)
    {
        $this->attributes[$key] = $regexp;
    }

    /**
     * {@inheritdoc}
     */
    public function matches(Request $request): bool
    {
        if ($this->schemes && !\in_array($request->getScheme(), $this->schemes, true)) {
            return false;
        }

        if ($this->methods && !\in_array($request->getMethod(), $this->methods, true)) {
            return false;
        }

        foreach ($this->attributes as $key => $pattern) {
            $requestAttribute = $request->attributes->get($key);
            if (!\is_string($requestAttribute)) {
                return false;
            }
            if (!preg_match('{'.$pattern.'}', $requestAttribute)) {
                return false;
            }
        }

        if (null !== $this->path && !preg_match('{'.$this->path.'}', rawurldecode($request->getPathInfo()))) {
            return false;
        }

        if (null !== $this->host && !preg_match('{'.$this->host.'}i', $request->getHost())) {
            return false;
        }

        if (null !== $this->port && 0 < $this->port && $request->getPort() !== $this->port) {
            return false;
        }

        if (IpUtils::checkIp($request->getClientIp() ?? '', $this->ips)) {
            return true;
        }

        // Note to future implementors: add additional checks above the
        // foreach above or else your check might not be run!
        return 0 === \count($this->ips);
    }
}

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Encryption is a process that transforms data into a secure format, known as ciphertext, which can only be deciphered using a specific decryption key. This means that even if data is intercepted during transmission, it remains unreadable and protected from unauthorized access. Encryption is essential in safeguarding sensitive payment information, such as credit card details and personal data, during online transactions.
Tokenization, on the other hand, involves substituting sensitive data with unique identifiers or "tokens." These tokens serve as placeholders and have no value outside of the specific transaction context. If intercepted, tokens are meaningless and cannot be used to access the original sensitive data. This method significantly reduces the risk of fraud and data breaches, as the actual payment information is not stored or transmitted.
Together, encryption and tokenization form a powerful security framework. Encryption ensures that data is protected during transmission, while tokenization minimizes the risk of exposing sensitive information by replacing it with secure, non-sensitive tokens.
These technologies are integral to modern payment platforms, providing a robust defense against cyber threats. By implementing advanced encryption and tokenization techniques, businesses can enhance the security of digital transactions, ensuring that users' financial and personal information remains safe. This comprehensive approach not only builds user trust but also fortifies the overall security infrastructure of digital payment systems. As cyber threats evolve, the continued advancement of encryption and tokenization will be crucial in maintaining secure and reliable payment processes.

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