<?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\Mime;

use Symfony\Component\Mime\Exception\RuntimeException;
use Symfony\Component\Mime\Part\DataPart;
use Symfony\Component\Mime\Part\Multipart\AlternativePart;
use Symfony\Component\Mime\Part\Multipart\MixedPart;
use Symfony\Component\Mime\Part\Multipart\RelatedPart;
use Symfony\Component\Mime\Part\TextPart;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
final class MessageConverter
{
    /**
     * @throws RuntimeException when unable to convert the message to an email
     */
    public static function toEmail(Message $message): Email
    {
        if ($message instanceof Email) {
            return $message;
        }

        // try to convert to a "simple" Email instance
        $body = $message->getBody();
        if ($body instanceof TextPart) {
            return self::createEmailFromTextPart($message, $body);
        }

        if ($body instanceof AlternativePart) {
            return self::createEmailFromAlternativePart($message, $body);
        }

        if ($body instanceof RelatedPart) {
            return self::createEmailFromRelatedPart($message, $body);
        }

        if ($body instanceof MixedPart) {
            $parts = $body->getParts();
            if ($parts[0] instanceof RelatedPart) {
                $email = self::createEmailFromRelatedPart($message, $parts[0]);
            } elseif ($parts[0] instanceof AlternativePart) {
                $email = self::createEmailFromAlternativePart($message, $parts[0]);
            } elseif ($parts[0] instanceof TextPart) {
                $email = self::createEmailFromTextPart($message, $parts[0]);
            } else {
                throw new RuntimeException(sprintf('Unable to create an Email from an instance of "%s" as the body is too complex.', get_debug_type($message)));
            }

            return self::attachParts($email, \array_slice($parts, 1));
        }

        throw new RuntimeException(sprintf('Unable to create an Email from an instance of "%s" as the body is too complex.', get_debug_type($message)));
    }

    private static function createEmailFromTextPart(Message $message, TextPart $part): Email
    {
        if ('text' === $part->getMediaType() && 'plain' === $part->getMediaSubtype()) {
            return (new Email(clone $message->getHeaders()))->text($part->getBody(), $part->getPreparedHeaders()->getHeaderParameter('Content-Type', 'charset') ?: 'utf-8');
        }
        if ('text' === $part->getMediaType() && 'html' === $part->getMediaSubtype()) {
            return (new Email(clone $message->getHeaders()))->html($part->getBody(), $part->getPreparedHeaders()->getHeaderParameter('Content-Type', 'charset') ?: 'utf-8');
        }

        throw new RuntimeException(sprintf('Unable to create an Email from an instance of "%s" as the body is too complex.', get_debug_type($message)));
    }

    private static function createEmailFromAlternativePart(Message $message, AlternativePart $part): Email
    {
        $parts = $part->getParts();
        if (
            2 === \count($parts) &&
            $parts[0] instanceof TextPart && 'text' === $parts[0]->getMediaType() && 'plain' === $parts[0]->getMediaSubtype() &&
            $parts[1] instanceof TextPart && 'text' === $parts[1]->getMediaType() && 'html' === $parts[1]->getMediaSubtype()
        ) {
            return (new Email(clone $message->getHeaders()))
                ->text($parts[0]->getBody(), $parts[0]->getPreparedHeaders()->getHeaderParameter('Content-Type', 'charset') ?: 'utf-8')
                ->html($parts[1]->getBody(), $parts[1]->getPreparedHeaders()->getHeaderParameter('Content-Type', 'charset') ?: 'utf-8')
            ;
        }

        throw new RuntimeException(sprintf('Unable to create an Email from an instance of "%s" as the body is too complex.', get_debug_type($message)));
    }

    private static function createEmailFromRelatedPart(Message $message, RelatedPart $part): Email
    {
        $parts = $part->getParts();
        if ($parts[0] instanceof AlternativePart) {
            $email = self::createEmailFromAlternativePart($message, $parts[0]);
        } elseif ($parts[0] instanceof TextPart) {
            $email = self::createEmailFromTextPart($message, $parts[0]);
        } else {
            throw new RuntimeException(sprintf('Unable to create an Email from an instance of "%s" as the body is too complex.', get_debug_type($message)));
        }

        return self::attachParts($email, \array_slice($parts, 1));
    }

    private static function attachParts(Email $email, array $parts): Email
    {
        foreach ($parts as $part) {
            if (!$part instanceof DataPart) {
                throw new RuntimeException(sprintf('Unable to create an Email from an instance of "%s" as the body is too complex.', get_debug_type($email)));
            }

            $headers = $part->getPreparedHeaders();
            $method = 'inline' === $headers->getHeaderBody('Content-Disposition') ? 'embed' : 'attach';
            $name = $headers->getHeaderParameter('Content-Disposition', 'filename');
            $email->$method($part->getBody(), $name, $part->getMediaType().'/'.$part->getMediaSubtype());
        }

        return $email;
    }
}

• [D] Crypto
• [D] DependencyInjection
• [D] Encoder
• [D] Exception
• [D] Header
• [D] Part
• [D] Resources
• [D] Test
• [F] Address.php
  Delete
• [F] BodyRendererInterface.php
  Delete
• [F] CHANGELOG.md
  Delete
• [F] CharacterStream.php
  Delete
• [F] composer.json
  Delete
• [F] Email.php
  Delete
• [F] FileBinaryMimeTypeGuesser.php
  Delete
• [F] FileinfoMimeTypeGuesser.php
  Delete
• [F] LICENSE
  Delete
• [F] Message.php
  Delete
• [F] MessageConverter.php
  Delete
• [F] MimeTypeGuesserInterface.php
  Delete
• [F] MimeTypes.php
  Delete
• [F] MimeTypesInterface.php
  Delete
• [F] RawMessage.php
  Delete
• [F] README.md
  Delete

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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.
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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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