Use KItinerary to extract information from emails and attachments

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

1 files changed, 106 insertions, 0 deletions

diff --git a/lib/Service/ItineraryService.php b/lib/Service/ItineraryService.php
new file mode 100644
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+++ b/lib/Service/ItineraryService.php
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+<?php declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\Mail\Service;
+
+use ChristophWurst\KItinerary\Itinerary;
+use OCA\Mail\Account;
+use OCA\Mail\Db\MailboxMapper;
+use OCA\Mail\IMAP\IMAPClientFactory;
+use OCA\Mail\IMAP\MessageMapper;
+use OCA\Mail\Integration\KItinerary\ItineraryExtractor;
+use OCP\ICacheFactory;
+use OCP\ILogger;
+use function array_reduce;
+use function count;
+use function json_encode;
+
+class ItineraryService {
+
+	/** @var IMAPClientFactory */
+	private $clientFactory;
+
+	/** @var MailboxMapper */
+	private $mailboxMapper;
+
+	/** @var MessageMapper */
+	private $messageMapper;
+
+	/** @var ItineraryExtractor */
+	private $extractor;
+
+	/** @var ILogger */
+	private $logger;
+
+	public function __construct(IMAPClientFactory $clientFactory,
+								MailboxMapper $mailboxMapper,
+								MessageMapper $messageMapper,
+								ItineraryExtractor $extractor,
+								ICacheFactory $cacheFactory,
+								ILogger $logger) {
+		$this->clientFactory = $clientFactory;
+		$this->mailboxMapper = $mailboxMapper;
+		$this->messageMapper = $messageMapper;
+		$this->extractor = $extractor;
+		$this->cache = $cacheFactory->createLocal();
+		$this->logger = $logger;
+	}
+
+	public function extract(Account $account, string $mailbox, int $id): Itinerary {
+		$mailbox = $this->mailboxMapper->find($account, $mailbox);
+
+		$cacheKey = 'mail_itinerary_' . $account->getId() . '_' . $mailbox->getMailbox() . '_' . $id;
+		if ($cached = ($this->cache->get($cacheKey))) {
+			return Itinerary::fromJson($cached);
+		}
+
+		$client = $this->clientFactory->getClient($account);
+
+		$itinerary = new Itinerary();
+		$htmlBody = $this->messageMapper->getHtmlBody($client, $mailbox->getMailbox(), $id);
+		if ($htmlBody !== null) {
+			$itinerary = $itinerary->merge(
+				$this->extractor->extract($htmlBody)
+			);
+			$this->logger->debug('Extracted ' . count($itinerary) . ' itinerary entries from the message HTML body');
+		} else {
+			$this->logger->debug('Message does not have an HTML body, can\'t extract itinerary info');
+		}
+		$attachments = $this->messageMapper->getRawAttachments($client, $mailbox->getMailbox(), $id);
+		$itinerary = array_reduce($attachments, function(Itinerary $combined, string $attachment) {
+			$extracted = $this->extractor->extract($attachment);
+			$this->logger->debug('Extracted ' . count($extracted) . ' itinerary entries from an attachment');
+			return $combined->merge($extracted);
+		}, $itinerary);
+
+		// Lastly, we put the extracted data through the tool again, so it can combine
+		// and pick the most relevant information
+		$final = $this->extractor->extract(json_encode($itinerary));
+		$this->logger->debug('Reduced ' . count($itinerary) . ' itinerary entries to ' . count($final) . ' entries');
+
+		$this->cache->set($cacheKey, json_encode($final));
+
+		return $final;
+	}
+
+}