1 files changed, 92 insertions, 0 deletions
diff --git a/lib/private/App/AppStore/Fetcher/Fetcher.php b/lib/private/App/AppStore/Fetcher/Fetcher.php
new file mode 100644
index 00000000000..cffff9176e2
--- /dev/null
+++ b/lib/private/App/AppStore/Fetcher/Fetcher.php
@@ -0,0 +1,92 @@
+<?php
+/**
+ * @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
+ *
+ * @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 OC\App\AppStore\Fetcher;
+
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\Files\IAppData;
+use OCP\Files\NotFoundException;
+use OCP\Http\Client\IClientService;
+
+abstract class Fetcher {
+	const INVALIDATE_AFTER_SECONDS = 300;
+
+	/** @var IAppData */
+	private $appData;
+	/** @var IClientService */
+	private $clientService;
+	/** @var ITimeFactory */
+	private $timeFactory;
+	/** @var string */
+	protected $fileName;
+	/** @var string */
+	protected $endpointUrl;
+
+	/**
+	 * @param IAppData $appData
+	 * @param IClientService $clientService
+	 * @param ITimeFactory $timeFactory
+	 */
+	public function __construct(IAppData $appData,
+								IClientService $clientService,
+								ITimeFactory $timeFactory) {
+		$this->appData = $appData;
+		$this->clientService = $clientService;
+		$this->timeFactory = $timeFactory;
+	}
+
+	/**
+	 * Returns the array with the categories on the appstore server
+	 *
+	 * @return array
+	 */
+	 public function get() {
+		$rootFolder = $this->appData->getFolder('/');
+
+		try {
+			// File does already exists
+			$file = $rootFolder->getFile($this->fileName);
+			$jsonBlob = json_decode($file->getContent(), true);
+			if(is_array($jsonBlob)) {
+				// If the timestamp is older than 300 seconds request the files new
+				if((int)$jsonBlob['timestamp'] > ($this->timeFactory->getTime() - self::INVALIDATE_AFTER_SECONDS)) {
+					return $jsonBlob['data'];
+				}
+			}
+		} catch (NotFoundException $e) {
+			// File does not already exists
+			$file = $rootFolder->newFile($this->fileName);
+		}
+
+		// Refresh the file content
+		$client = $this->clientService->newClient();
+		try {
+			$response = $client->get($this->endpointUrl);
+			$responseJson = [];
+			$responseJson['data'] = json_decode($response->getBody(), true);
+			$responseJson['timestamp'] = $this->timeFactory->getTime();
+			$file->putContent(json_encode($responseJson));
+			return json_decode($file->getContent(), true)['data'];
+		} catch (\Exception $e) {
+			return [];
+		}
+	}
+}