145 lines
3.9 KiB
PHP
145 lines
3.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\App\AppStore\Fetcher;
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use OCP\AppFramework\Http;
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use OCP\AppFramework\Utility\ITimeFactory;
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use OCP\Files\IAppData;
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use OCP\Files\NotFoundException;
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use OCP\Http\Client\IClientService;
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use OCP\IConfig;
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abstract class Fetcher {
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const INVALIDATE_AFTER_SECONDS = 300;
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/** @var IAppData */
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protected $appData;
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/** @var IClientService */
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protected $clientService;
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/** @var ITimeFactory */
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protected $timeFactory;
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/** @var IConfig */
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protected $config;
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/** @var string */
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protected $fileName;
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/** @var string */
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protected $endpointUrl;
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/**
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* @param IAppData $appData
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* @param IClientService $clientService
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* @param ITimeFactory $timeFactory
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* @param IConfig $config
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*/
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public function __construct(IAppData $appData,
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IClientService $clientService,
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ITimeFactory $timeFactory,
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IConfig $config) {
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$this->appData = $appData;
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$this->clientService = $clientService;
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$this->timeFactory = $timeFactory;
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$this->config = $config;
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}
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/**
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* Fetches the response from the server
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*
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* @param string $ETag
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* @param string $content
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*
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* @return array
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*/
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protected function fetch($ETag, $content) {
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$options = [];
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if ($ETag !== '') {
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$options['headers'] = [
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'If-None-Match' => $ETag,
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];
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}
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$client = $this->clientService->newClient();
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$response = $client->get($this->endpointUrl, $options);
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$responseJson = [];
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if ($response->getStatusCode() === Http::STATUS_NOT_MODIFIED) {
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$responseJson['data'] = json_decode($content, true);
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} else {
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$responseJson['data'] = json_decode($response->getBody(), true);
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$ETag = $response->getHeader('ETag');
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}
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$responseJson['timestamp'] = $this->timeFactory->getTime();
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$responseJson['ncversion'] = $this->config->getSystemValue('version');
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if ($ETag !== '') {
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$responseJson['ETag'] = $ETag;
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}
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return $responseJson;
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}
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/**
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* Returns the array with the categories on the appstore server
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*
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* @return array
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*/
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public function get() {
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$rootFolder = $this->appData->getFolder('/');
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$ETag = '';
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$content = '';
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try {
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// File does already exists
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$file = $rootFolder->getFile($this->fileName);
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$jsonBlob = json_decode($file->getContent(), true);
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if(is_array($jsonBlob)) {
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/*
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* If the timestamp is older than 300 seconds request the files new
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* If the version changed (update!) also refresh
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*/
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if((int)$jsonBlob['timestamp'] > ($this->timeFactory->getTime() - self::INVALIDATE_AFTER_SECONDS) &&
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isset($jsonBlob['ncversion']) && $jsonBlob['ncversion'] === $this->config->getSystemValue('version', '0.0.0')) {
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return $jsonBlob['data'];
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}
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if (isset($jsonBlob['ETag'])) {
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$ETag = $jsonBlob['ETag'];
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$content = json_encode($jsonBlob['data']);
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}
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}
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} catch (NotFoundException $e) {
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// File does not already exists
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$file = $rootFolder->newFile($this->fileName);
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}
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// Refresh the file content
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try {
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$responseJson = $this->fetch($ETag, $content);
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$file->putContent(json_encode($responseJson));
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return json_decode($file->getContent(), true)['data'];
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} catch (\Exception $e) {
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return [];
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}
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}
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}
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