feat: mail provider backend

Signed-off-by: SebastianKrupinski <krupinskis05@gmail.com>

lib/AppInfo/Application.php

@@ -55,6 +55,7 @@
 use OCA\Mail\Listener\SpamReportListener;
 use OCA\Mail\Listener\UserDeletedListener;
 use OCA\Mail\Notification\Notifier;
+use OCA\Mail\Provider\MailProvider;
 use OCA\Mail\Search\FilteringProvider;
 use OCA\Mail\Search\Provider;
 use OCA\Mail\Service\Attachment\AttachmentService;
@@ -164,6 +165,14 @@ public function register(IRegistrationContext $context): void {
 			$context->registerSearchProvider(Provider::class);
 		}
 
+
+		// TODO: drop condition if nextcloud < 30 is not supported anymore
+		// evaluate, if mail provider registration is possible
+		if (method_exists($context, 'registerMailProvider')) {
+			// register mail provider
+			$context->registerMailProvider(MailProvider::class);
+		}
+
 		$context->registerNotifierService(Notifier::class);
 
 		// bypass Horde Translation system

lib/Db/MailAccountMapper.php

@@ -83,6 +83,29 @@ public function findByUserId(string $userId): array {
 		return $this->findEntities($query);
 	}
 
+	/**
+	 * Finds a mail account(s) by user id and mail address
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			system user id
+	 * @param string $address			mail address (e.g. test@example.com)
+	 *
+	 * @return MailAccount[]
+	 *
+	 * @throws DoesNotExistException
+	 */
+	public function findByUserIdAndAddress(string $userId, string $address): array {
+		$qb = $this->db->getQueryBuilder();
+		$query = $qb
+			->select('*')
+			->from($this->getTableName())
+			->where($qb->expr()->eq('user_id', $qb->createNamedParameter($userId)))
+			->andWhere($qb->expr()->eq('email', $qb->createNamedParameter($address)));
+
+		return $this->findEntities($query);
+	}
+
 	/**
 	 * @throws DoesNotExistException
 	 * @throws MultipleObjectsReturnedException

lib/Provider/Command/MessageSend.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Mail\Provider\Command;
+
+use OCA\Mail\Db\LocalMessage;
+use OCA\Mail\Service\AccountService;
+use OCA\Mail\Service\Attachment\AttachmentService;
+use OCA\Mail\Service\OutboxService;
+use OCA\Mail\Service\SmimeService;
+use OCP\IConfig;
+use OCP\Mail\Provider\IMessage;
+
+class MessageSend {
+
+	public function __construct(
+		protected IConfig $config,
+		protected AccountService $accountService,
+		protected OutboxService $outboxService,
+		protected AttachmentService $attachmentService,
+		protected SmimeService $smimeService
+	) {
+	}
+
+	public function perform(string $userId, string $serviceId, IMessage $message, array $option = []): void {
+		// find user mail account details
+		$account = $this->accountService->find($userId, (int) $serviceId);
+		// convert mail provider message to local message
+		$lm = new LocalMessage();
+		$lm->setType($lm::TYPE_OUTGOING);
+		$lm->setAccountId($account->getId());
+		$lm->setSubject($message->getSubject());
+		$lm->setBody($message->getBody());
+		$lm->setHtml(true);
+		$lm->setSendAt(time());
+
+		// convert all mail provider attachments to local attachments
+		$attachments = [];
+		if (count($message->getAttachments()) > 0) {
+			// iterate attachments and save them
+			foreach ($message->getAttachments() as $entry) {
+				$attachments[] = $this->attachmentService->addFileFromString(
+					$userId,
+					$entry->getName(),
+					$entry->getType(),
+					$entry->getContents()
+				)->jsonSerialize();
+			}
+		}
+		// convert recipiant addresses
+		$to = $this->convertAddressArray($message->getTo());
+		$cc = $this->convertAddressArray($message->getCc());
+		$bcc = $this->convertAddressArray($message->getBcc());
+		// save message for sending
+		$lm = $this->outboxService->saveMessage(
+			$account,
+			$lm,
+			$to,
+			$cc,
+			$bcc,
+			$attachments
+		);
+
+		// evaluate if job scheduler is NOT cron, send message right away otherwise let cron job handle it
+		if ($this->config->getAppValue('core', 'backgroundjobs_mode', 'ajax') !== 'cron') {
+			$lm = $this->outboxService->sendMessage($lm, $account);
+		}
+
+	}
+
+	protected function convertAddressArray(array|null $in) {
+		// construct place holder
+		$out = [];
+		// convert format
+		foreach ($in as $entry) {
+			$out[] = (!empty($entry->getLabel())) ? ['email' => $entry->getAddress(), 'label' => $entry->getLabel()] : ['email' => $entry->getAddress()];
+		}
+		// return converted addressess
+		return $out;
+	}
+
+}

lib/Provider/MailProvider.php

@@ -0,0 +1,238 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Mail\Provider;
+
+use OCA\Mail\Account;
+use OCA\Mail\Service\AccountService;
+
+use OCP\Mail\Provider\Address as MailAddress;
+use OCP\Mail\Provider\IProvider;
+use OCP\Mail\Provider\IService;
+
+use Psr\Container\ContainerInterface;
+
+class MailProvider implements IProvider {
+
+	private ?array $ServiceCollection = [];
+
+	public function __construct(
+		protected ContainerInterface $container,
+		protected AccountService $AccountService
+	) {
+	}
+
+	/**
+	 * arbitrary unique text string identifying this provider
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @return string				id of this provider (e.g. UUID or 'IMAP/SMTP' or anything else)
+	 */
+	public function id(): string {
+
+		return 'mail-application';
+
+	}
+
+	/**
+	 * localized human frendly name of this provider
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @return string				label/name of this provider (e.g. Plain Old IMAP/SMTP)
+	 */
+	public function label(): string {
+
+		return 'Mail Application';
+
+	}
+
+	/**
+	 * determain if any services are configured for a specific user
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId		user id
+	 *
+	 * @return bool 				true if any services are configure for the user
+	 */
+	public function hasServices(string $userId): bool {
+
+		return (count($this->listServices($userId)) > 0);
+
+	}
+
+	/**
+	 * retrieve collection of services for a specific user
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			user id
+	 *
+	 * @return array<string,IService>	collection of service id and object ['1' => IServiceObject]
+	 */
+	public function listServices(string $userId): array {
+
+		try {
+			// retrieve service(s) details from data store
+			$accounts = $this->AccountService->findByUserId($userId);
+		} catch (\Throwable $th) {
+			return [];
+		}
+		// construct temporary collection
+		$services = [];
+		// add services to collection
+		foreach ($accounts as $entry) {
+			// extract values
+			$serviceId = (string) $entry->getId();
+			$label = $entry->getName();
+			$address = new MailAddress($entry->getEmail(), $entry->getName());
+			$identity = new MailServiceIdentity();
+			$location = new MailServiceLocation();
+			// add service to collection
+			$services[$serviceId] = new MailService($this->container, $userId, $serviceId, $label, $address, $identity, $location);
+		}
+		// return list of services for user
+		return $services;
+
+	}
+
+	/**
+	 * retrieve a service with a specific id
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			user id
+	 * @param string $serviceId			service id
+	 *
+	 * @return IService|null			returns service object or null if none found
+	 */
+	public function findServiceById(string $userId, string $serviceId): IService | null {
+
+		// evaluate if id is a number
+		if (is_numeric($serviceId)) {
+			try {
+				// retrieve service details from data store
+				$account = $this->AccountService->find($userId, (int) $serviceId);
+			} catch(\Throwable $th) {
+				return null;
+			}
+		}
+		// evaliate if service details where found
+		if ($account instanceof Account) {
+			// extract values
+			$serviceId = (string) $account->getId();
+			$label = $account->getName();
+			$address = new MailAddress($account->getEmail(), $account->getName());
+			$identity = new MailServiceIdentity();
+			$location = new MailServiceLocation();
+			// return mail service object
+			return (new MailService($this->container, $userId, $serviceId, $label, $address, $identity, $location));
+		}
+
+		return null;
+
+	}
+
+	/**
+	 * retrieve a service for a specific mail address
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			user id
+	 * @param string $address			mail address (e.g. test@example.com)
+	 *
+	 * @return IService					returns service object or null if none found
+	 */
+	public function findServiceByAddress(string $userId, string $address): IService | null {
+
+		try {
+			// retrieve service details from data store
+			$accounts = $this->AccountService->findByUserIdAndAddress($userId, $address);
+		} catch(\Throwable $th) {
+			return null;
+		}
+		// evaliate if service details where found
+		if (is_array($accounts) && count($accounts) > 0 && $accounts[0] instanceof Account) {
+			// extract values
+			$serviceId = (string) $accounts[0]->getId();
+			$label = $accounts[0]->getName();
+			$address = new MailAddress($accounts[0]->getEmail(), $accounts[0]->getName());
+			$identity = new MailServiceIdentity();
+			$location = new MailServiceLocation();
+			// return mail service object
+			return (new MailService($this->container, $userId, $serviceId, $label, $address, $identity, $location));
+		}
+
+		return null;
+
+	}
+
+	/**
+	 * construct a new empty service object
+	 *
+	 * @since 30.0.0
+	 *
+	 * @return IService					blank service object
+	 */
+	public function initiateService(): IService {
+
+		return (new MailService($this->container));
+
+	}
+
+	/**
+	 * create a service configuration for a specific user
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			user id
+	 * @param IService $service 		service object
+	 *
+	 * @return string					id of created service
+	 */
+	public function createService(string $userId, IService $service): string {
+
+		return '';
+
+	}
+
+	/**
+	 * modify a service configuration for a specific user
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			user id
+	 * @param IService $service 		service object
+	 *
+	 * @return string					id of modifided service
+	 */
+	public function modifyService(string $userId, IService $service): string {
+
+		return '';
+
+	}
+
+	/**
+	 * delete a service configuration for a specific user
+	 *
+	 * @since 2024.05.25
+	 *
+	 * @param string $userId			user id
+	 * @param IService $service 		service object
+	 *
+	 * @return bool						status of delete action
+	 */
+	public function deleteService(string $userId, IService $service): bool {
+
+		return false;
+
+	}
+
+}