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Edit File: MailgunTransport.php

<?php

namespace Illuminate\Mail\Transport;

use GuzzleHttp\ClientInterface;
use GuzzleHttp\Exception\GuzzleException;
use Swift_Mime_SimpleMessage;
use Swift_TransportException;

class MailgunTransport extends Transport
{
    /**
     * Guzzle client instance.
     *
     * @var \GuzzleHttp\ClientInterface
     */
    protected $client;

/**
     * The Mailgun API key.
     *
     * @var string
     */
    protected $key;

/**
     * The Mailgun email domain.
     *
     * @var string
     */
    protected $domain;

/**
     * The Mailgun API endpoint.
     *
     * @var string
     */
    protected $endpoint;

/**
     * Create a new Mailgun transport instance.
     *
     * @param  \GuzzleHttp\ClientInterface  $client
     * @param  string  $key
     * @param  string  $domain
     * @param  string|null  $endpoint
     * @return void
     */
    public function __construct(ClientInterface $client, $key, $domain, $endpoint = null)
    {
        $this->key = $key;
        $this->client = $client;
        $this->endpoint = $endpoint ?? 'api.mailgun.net';

$this->setDomain($domain);
    }

/**
     * {@inheritdoc}
     *
     * @return int
     */
    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
    {
        $this->beforeSendPerformed($message);

$to = $this->getTo($message);

$bcc = $message->getBcc();

$message->setBcc([]);

try {
            $response = $this->client->request(
                'POST',
                "https://{$this->endpoint}/v3/{$this->domain}/messages.mime",
                $this->payload($message, $to)
            );
        } catch (GuzzleException $e) {
            throw new Swift_TransportException('Request to Mailgun API failed.', $e->getCode(), $e);
        }

$messageId = $this->getMessageId($response);

$message->getHeaders()->addTextHeader('X-Message-ID', $messageId);
        $message->getHeaders()->addTextHeader('X-Mailgun-Message-ID', $messageId);

$message->setBcc($bcc);

$this->sendPerformed($message);

return $this->numberOfRecipients($message);
    }

/**
     * Get the HTTP payload for sending the Mailgun message.
     *
     * @param  \Swift_Mime_SimpleMessage  $message
     * @param  string  $to
     * @return array
     */
    protected function payload(Swift_Mime_SimpleMessage $message, $to)
    {
        return [
            'auth' => [
                'api',
                $this->key,
            ],
            'multipart' => [
                [
                    'name' => 'to',
                    'contents' => $to,
                ],
                [
                    'name' => 'message',
                    'contents' => $message->toString(),
                    'filename' => 'message.mime',
                ],
            ],
        ];
    }

/**
     * Get the "to" payload field for the API request.
     *
     * @param  \Swift_Mime_SimpleMessage  $message
     * @return string
     */
    protected function getTo(Swift_Mime_SimpleMessage $message)
    {
        return collect($this->allContacts($message))->map(function ($display, $address) {
            return $display ? $display." <{$address}>" : $address;
        })->values()->implode(',');
    }

/**
     * Get all of the contacts for the message.
     *
     * @param  \Swift_Mime_SimpleMessage  $message
     * @return array
     */
    protected function allContacts(Swift_Mime_SimpleMessage $message)
    {
        return array_merge(
            (array) $message->getTo(), (array) $message->getCc(), (array) $message->getBcc()
        );
    }

/**
     * Get the message ID from the response.
     *
     * @param  \Psr\Http\Message\ResponseInterface  $response
     * @return string
     */
    protected function getMessageId($response)
    {
        return object_get(
            json_decode($response->getBody()->getContents()), 'id'
        );
    }

/**
     * Get the API key being used by the transport.
     *
     * @return string
     */
    public function getKey()
    {
        return $this->key;
    }

/**
     * Set the API key being used by the transport.
     *
     * @param  string  $key
     * @return string
     */
    public function setKey($key)
    {
        return $this->key = $key;
    }

/**
     * Get the domain being used by the transport.
     *
     * @return string
     */
    public function getDomain()
    {
        return $this->domain;
    }

/**
     * Set the domain being used by the transport.
     *
     * @param  string  $domain
     * @return string
     */
    public function setDomain($domain)
    {
        return $this->domain = $domain;
    }

/**
     * Get the API endpoint being used by the transport.
     *
     * @return string
     */
    public function getEndpoint()
    {
        return $this->endpoint;
    }

/**
     * Set the API endpoint being used by the transport.
     *
     * @param  string  $endpoint
     * @return string
     */
    public function setEndpoint($endpoint)
    {
        return $this->endpoint = $endpoint;
    }
}

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