emails/api/common/Controller/Attachments.php

<?php
namespace ProVM\Common\Controller;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Log\LoggerInterface;
use ProVM\Common\Implement\Controller\Json;
use ProVM\Common\Service;
use ProVM\Emails\Model\Attachment;
use ProVM\Common\Exception\Request\MissingArgument;
use function Safe\json_decode;

class Attachments
{
    use Json;

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, Service\Attachments $service): ResponseInterface
    {
        $attachments = array_map(function(Attachment $attachment) {
            return $attachment->toArray();
        },$service->getAll());
        $output = [
            'total' => count($attachments),
            'attachments' => $attachments
        ];
        return $this->withJson($response, $output);
    }
    public function get(ServerRequestInterface $request, ResponseInterface $response, Service\Attachments $service, LoggerInterface $logger, int $attachment_id): ResponseInterface
    {
        $attachment = $service->getRepository()->fetchById($attachment_id);

        $response->withHeader('Content-Type', 'application/pdf');
        $response->withHeader('Content-Disposition', "'attachment;filename='{$attachment->getFullFilename()}'");
        $response->getBody()->write($service->getFile($attachment_id));
        return $response;
    }
    public function grab(ServerRequestInterface $request, ResponseInterface $response, Service\Attachments $service, Service\Messages $messagesService): ResponseInterface
    {
        $body = $request->getBody();
        $json = json_decode($body->getContents());
        if (!isset($json->messages)) {
            throw new MissingArgument('messages', 'array', 'Messages UIDs');
        }
        $output = [
            'messages' => $json->messages,
            'attachments' => [],
            'total' => 0
        ];
        foreach ($json->messages as $message_uid) {
            $message = $messagesService->getLocalMessage($message_uid);
            $attachments = $service->grab($message->getId());
            $output['attachments'] = array_merge($output['attachments'], $attachments);
            $output['total'] += count($attachments);
        }

        return $this->withJson($response, $output);
    }
}