1 files changed, 138 insertions, 0 deletions
diff --git a/lib/private/Remote/Instance.php b/lib/private/Remote/Instance.php
new file mode 100644
index 00000000000..10403af4ec7
--- /dev/null
+++ b/lib/private/Remote/Instance.php
@@ -0,0 +1,138 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\Remote;
+
+use OC\Remote\Api\NotFoundException;
+use OCP\Http\Client\IClientService;
+use OCP\ICache;
+use OCP\Remote\IInstance;
+
+/**
+ * Provides some basic info about a remote Nextcloud instance
+ */
+class Instance implements IInstance {
+	/** @var string */
+	private $url;
+
+	/** @var ICache */
+	private $cache;
+
+	/** @var IClientService */
+	private $clientService;
+
+	/** @var array|null */
+	private $status;
+
+	/**
+	 * @param string $url
+	 * @param ICache $cache
+	 * @param IClientService $clientService
+	 */
+	public function __construct($url, ICache $cache, IClientService $clientService) {
+		$url = str_replace('https://', '', $url);
+		$this->url = str_replace('http://', '', $url);
+		$this->cache = $cache;
+		$this->clientService = $clientService;
+	}
+
+	/**
+	 * @return string The url of the remote server without protocol
+	 */
+	public function getUrl() {
+		return $this->url;
+	}
+
+	/**
+	 * @return string The of the remote server with protocol
+	 */
+	public function getFullUrl() {
+		return $this->getProtocol() . '://' . $this->getUrl();
+	}
+
+	/**
+	 * @return string The full version string in '13.1.2.3' format
+	 */
+	public function getVersion() {
+		$status = $this->getStatus();
+		return $status['version'];
+	}
+
+	/**
+	 * @return string 'http' or 'https'
+	 */
+	public function getProtocol() {
+		$status = $this->getStatus();
+		return $status['protocol'];
+	}
+
+	/**
+	 * Check that the remote server is installed and not in maintenance mode
+	 *
+	 * @return bool
+	 */
+	public function isActive() {
+		$status = $this->getStatus();
+		return $status['installed'] && !$status['maintenance'];
+	}
+
+	/**
+	 * @return array
+	 * @throws NotFoundException
+	 * @throws \Exception
+	 */
+	private function getStatus() {
+		if ($this->status) {
+			return $this->status;
+		}
+		$key = 'remote/' . $this->url . '/status';
+		$httpsKey = 'remote/' . $this->url . '/https';
+		$status = $this->cache->get($key);
+		if (!$status) {
+			$response = $this->downloadStatus('https://' . $this->getUrl() . '/status.php');
+			$protocol = 'https';
+			if (!$response) {
+				if ($status = $this->cache->get($httpsKey)) {
+					throw new \Exception('refusing to connect to remote instance(' . $this->url . ') over http that was previously accessible over https');
+				}
+				$response = $this->downloadStatus('http://' . $this->getUrl() . '/status.php');
+				$protocol = 'http';
+			} else {
+				$this->cache->set($httpsKey, true, 60 * 60 * 24 * 365);
+			}
+			$status = json_decode($response, true);
+			if ($status) {
+				$status['protocol'] = $protocol;
+			}
+			if ($status) {
+				$this->cache->set($key, $status, 5 * 60);
+				$this->status = $status;
+			} else {
+				throw new NotFoundException('Remote server not found at address ' . $this->url);
+			}
+		}
+		return $status;
+	}
+
+	/**
+	 * @param string $url
+	 * @return bool|string
+	 */
+	private function downloadStatus($url) {
+		try {
+			$request = $this->clientService->newClient()->get($url);
+			$content = $request->getBody();
+
+			// IResponse.getBody responds with null|resource if returning a stream response was requested.
+			// As that's not the case here, we can just ignore the psalm warning by adding an assertion.
+			assert(is_string($content));
+
+			return $content;
+		} catch (\Exception $e) {
+			return false;
+		}
+	}
+}