<?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\Mailer;

use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\Mailer\Bridge\Amazon\Transport\SesTransportFactory;
use Symfony\Component\Mailer\Bridge\Google\Transport\GmailTransportFactory;
use Symfony\Component\Mailer\Bridge\Mailchimp\Transport\MandrillTransportFactory;
use Symfony\Component\Mailer\Bridge\Mailgun\Transport\MailgunTransportFactory;
use Symfony\Component\Mailer\Bridge\Mailjet\Transport\MailjetTransportFactory;
use Symfony\Component\Mailer\Bridge\OhMySmtp\Transport\OhMySmtpTransportFactory;
use Symfony\Component\Mailer\Bridge\Postmark\Transport\PostmarkTransportFactory;
use Symfony\Component\Mailer\Bridge\Sendgrid\Transport\SendgridTransportFactory;
use Symfony\Component\Mailer\Bridge\Sendinblue\Transport\SendinblueTransportFactory;
use Symfony\Component\Mailer\Exception\InvalidArgumentException;
use Symfony\Component\Mailer\Exception\UnsupportedSchemeException;
use Symfony\Component\Mailer\Transport\Dsn;
use Symfony\Component\Mailer\Transport\FailoverTransport;
use Symfony\Component\Mailer\Transport\NativeTransportFactory;
use Symfony\Component\Mailer\Transport\NullTransportFactory;
use Symfony\Component\Mailer\Transport\RoundRobinTransport;
use Symfony\Component\Mailer\Transport\SendmailTransportFactory;
use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransportFactory;
use Symfony\Component\Mailer\Transport\TransportFactoryInterface;
use Symfony\Component\Mailer\Transport\TransportInterface;
use Symfony\Component\Mailer\Transport\Transports;
use Symfony\Contracts\HttpClient\HttpClientInterface;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Konstantin Myakshin <molodchick@gmail.com>
 */
final class Transport
{
    private const FACTORY_CLASSES = [
        GmailTransportFactory::class,
        MailgunTransportFactory::class,
        MailjetTransportFactory::class,
        MandrillTransportFactory::class,
        OhMySmtpTransportFactory::class,
        PostmarkTransportFactory::class,
        SendgridTransportFactory::class,
        SendinblueTransportFactory::class,
        SesTransportFactory::class,
    ];

    private iterable $factories;

    public static function fromDsn(string $dsn, EventDispatcherInterface $dispatcher = null, HttpClientInterface $client = null, LoggerInterface $logger = null): TransportInterface
    {
        $factory = new self(iterator_to_array(self::getDefaultFactories($dispatcher, $client, $logger)));

        return $factory->fromString($dsn);
    }

    public static function fromDsns(array $dsns, EventDispatcherInterface $dispatcher = null, HttpClientInterface $client = null, LoggerInterface $logger = null): TransportInterface
    {
        $factory = new self(iterator_to_array(self::getDefaultFactories($dispatcher, $client, $logger)));

        return $factory->fromStrings($dsns);
    }

    /**
     * @param TransportFactoryInterface[] $factories
     */
    public function __construct(iterable $factories)
    {
        $this->factories = $factories;
    }

    public function fromStrings(array $dsns): Transports
    {
        $transports = [];
        foreach ($dsns as $name => $dsn) {
            $transports[$name] = $this->fromString($dsn);
        }

        return new Transports($transports);
    }

    public function fromString(string $dsn): TransportInterface
    {
        [$transport, $offset] = $this->parseDsn($dsn);
        if ($offset !== \strlen($dsn)) {
            throw new InvalidArgumentException(sprintf('The DSN has some garbage at the end: "%s".', substr($dsn, $offset)));
        }

        return $transport;
    }

    private function parseDsn(string $dsn, int $offset = 0): array
    {
        static $keywords = [
            'failover' => FailoverTransport::class,
            'roundrobin' => RoundRobinTransport::class,
        ];

        while (true) {
            foreach ($keywords as $name => $class) {
                $name .= '(';
                if ($name === substr($dsn, $offset, \strlen($name))) {
                    $offset += \strlen($name) - 1;
                    preg_match('{\(([^()]|(?R))*\)}A', $dsn, $matches, 0, $offset);
                    if (!isset($matches[0])) {
                        continue;
                    }

                    ++$offset;
                    $args = [];
                    while (true) {
                        [$arg, $offset] = $this->parseDsn($dsn, $offset);
                        $args[] = $arg;
                        if (\strlen($dsn) === $offset) {
                            break;
                        }
                        ++$offset;
                        if (')' === $dsn[$offset - 1]) {
                            break;
                        }
                    }

                    return [new $class($args), $offset];
                }
            }

            if (preg_match('{(\w+)\(}A', $dsn, $matches, 0, $offset)) {
                throw new InvalidArgumentException(sprintf('The "%s" keyword is not valid (valid ones are "%s"), ', $matches[1], implode('", "', array_keys($keywords))));
            }

            if ($pos = strcspn($dsn, ' )', $offset)) {
                return [$this->fromDsnObject(Dsn::fromString(substr($dsn, $offset, $pos))), $offset + $pos];
            }

            return [$this->fromDsnObject(Dsn::fromString(substr($dsn, $offset))), \strlen($dsn)];
        }
    }

    public function fromDsnObject(Dsn $dsn): TransportInterface
    {
        foreach ($this->factories as $factory) {
            if ($factory->supports($dsn)) {
                return $factory->create($dsn);
            }
        }

        throw new UnsupportedSchemeException($dsn);
    }

    /**
     * @return \Traversable<int, TransportFactoryInterface>
     */
    public static function getDefaultFactories(EventDispatcherInterface $dispatcher = null, HttpClientInterface $client = null, LoggerInterface $logger = null): \Traversable
    {
        foreach (self::FACTORY_CLASSES as $factoryClass) {
            if (class_exists($factoryClass)) {
                yield new $factoryClass($dispatcher, $client, $logger);
            }
        }

        yield new NullTransportFactory($dispatcher, $client, $logger);

        yield new SendmailTransportFactory($dispatcher, $client, $logger);

        yield new EsmtpTransportFactory($dispatcher, $client, $logger);

        yield new NativeTransportFactory($dispatcher, $client, $logger);
    }
}

• [D] DataCollector
• [D] Event
• [D] EventListener
• [D] Exception
• [D] Header
• [D] Messenger
• [D] Test
• [D] Transport
• [F] CHANGELOG.md
  Delete
• [F] composer.json
  Delete
• [F] DelayedEnvelope.php
  Delete
• [F] Envelope.php
  Delete
• [F] LICENSE
  Delete
• [F] Mailer.php
  Delete
• [F] MailerInterface.php
  Delete
• [F] README.md
  Delete
• [F] SentMessage.php
  Delete
• [F] Transport.php
  Delete

Categories

• Blog 1
• Payment 1
• Competitive Research 1
• Information Technology 0

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Enhancing Payment Security: The Role of Encryption and Tokenization in Digital Transactions

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational technologies that are pivotal in this effort are encryption and tokenization.
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.

Tags

• Payment