From a5c1eb0a9b46c2463011f27a3edd58fbf4f32876 Mon Sep 17 00:00:00 2001
From: Olivier Paroz <github@oparoz.com>
Date: Tue, 18 Aug 2015 03:16:49 +0200
Subject: Add Thumbnails API

---
 utility/eventsource.php | 95 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 utility/eventsource.php

(limited to 'utility')

diff --git a/utility/eventsource.php b/utility/eventsource.php
new file mode 100644
index 00000000..63bf1d72
--- /dev/null
+++ b/utility/eventsource.php
@@ -0,0 +1,95 @@
+<?php
+/**
+ * ownCloud - gallery
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Bart Visscher <bartv@thisnet.nl>
+ * @author Felix Moeller <mail@felixmoeller.de>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ * @author Robin Appelman <icewind@owncloud.com>
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ * @author Vincent Petry <pvince81@owncloud.com>
+ * @author Olivier Paroz <owncloud@interfasys.ch>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @copyright Olivier Paroz 2015
+ */
+
+namespace OCA\Gallery\Utility;
+
+/**
+ * Class EventSource
+ *
+ * Wrapper for server side events (http://en.wikipedia.org/wiki/Server-sent_events)
+ *
+ * This version is tailored for the Gallery app, do not use elsewhere!
+ *
+ * @todo Replace with a library
+ *
+ * @package OCA\Gallery\Controller
+ */
+class EventSource implements \OCP\IEventSource {
+
+	/**
+	 * @var bool
+	 */
+	private $started = false;
+
+	protected function init() {
+		if ($this->started) {
+			return;
+		}
+		$this->started = true;
+
+		// prevent php output buffering, caching and nginx buffering
+		while (ob_get_level()) {
+			ob_end_clean();
+		}
+		header('Cache-Control: no-cache');
+		header('X-Accel-Buffering: no');
+		header("Content-Type: text/event-stream");
+		flush();
+	}
+
+	/**
+	 * Sends a message to the client
+	 *
+	 * If only one parameter is given, a typeless message will be sent with that parameter as data
+	 *
+	 * @param string $type
+	 * @param mixed $data
+	 *
+	 * @throws \BadMethodCallException
+	 */
+	public function send($type, $data = null) {
+		if ($data and !preg_match('/^[A-Za-z0-9_]+$/', $type)) {
+			throw new \BadMethodCallException('Type needs to be alphanumeric (' . $type . ')');
+		}
+		$this->init();
+		if (is_null($data)) {
+			$data = $type;
+			$type = null;
+		}
+
+		if ($type) {
+			echo 'event: ' . $type . PHP_EOL;
+		}
+		echo 'data: ' . json_encode($data) . PHP_EOL;
+
+		echo PHP_EOL;
+		flush();
+	}
+
+	/**
+	 * Closes the connection of the event source
+	 *
+	 * It's best to let the client close the stream
+	 */
+	public function close() {
+		$this->send(
+			'__internal__', 'close'
+		);
+	}
+}
-- 
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