1 files changed, 133 insertions, 0 deletions
diff --git a/Zotlabs/Module/Sse.php b/Zotlabs/Module/Sse.php
new file mode 100644
index 000000000..b227a396d
--- /dev/null
+++ b/Zotlabs/Module/Sse.php
@@ -0,0 +1,133 @@
+<?php
+
+namespace Zotlabs\Module;
+
+use App;
+use Zotlabs\Lib\Apps;
+use Zotlabs\Web\Controller;
+use Zotlabs\Lib\Enotify;
+
+class Sse extends Controller {
+
+	public static $uid;
+	public static $ob_hash;
+	public static $sse_id;
+	public static $vnotify;
+
+	function init() {
+
+		if((observer_prohibited(true))) {
+			killme();
+		}
+
+		if(! intval(get_config('system','open_pubstream',1))) {
+			if(! get_observer_hash()) {
+				killme();
+			}
+		}
+
+		// this is important!
+		session_write_close();
+
+		self::$uid = local_channel();
+		self::$ob_hash = get_observer_hash();
+		self::$sse_id = false;
+
+		if(! self::$ob_hash) {
+			if(session_id()) {
+				self::$sse_id = true;
+				self::$ob_hash = 'sse_id.' . session_id();
+			}
+			else {
+				return;
+			}
+		}
+
+		self::$vnotify = get_pconfig(self::$uid, 'system', 'vnotify');
+
+		$sys = get_sys_channel();
+		$sleep_seconds = 3;
+
+		header("Content-Type: text/event-stream");
+		header("Cache-Control: no-cache");
+		header("Connection: keep-alive");
+		header("X-Accel-Buffering: no");
+
+		while(true) {
+
+			/**
+			 * Update chat presence indication (if applicable)
+			 */
+
+			if(! self::$sse_id) {
+				$r = q("select cp_id, cp_room from chatpresence where cp_xchan = '%s' and cp_client = '%s' and cp_room = 0 limit 1",
+					dbesc(self::$ob_hash),
+					dbesc($_SERVER['REMOTE_ADDR'])
+				);
+				$basic_presence = false;
+				if($r) {
+					$basic_presence = true;
+					q("update chatpresence set cp_last = '%s' where cp_id = %d",
+						dbesc(datetime_convert()),
+						intval($r[0]['cp_id'])
+					);
+				}
+				if(! $basic_presence) {
+					q("insert into chatpresence ( cp_xchan, cp_last, cp_status, cp_client)
+						values( '%s', '%s', '%s', '%s' ) ",
+						dbesc(self::$ob_hash),
+						dbesc(datetime_convert()),
+						dbesc('online'),
+						dbesc($_SERVER['REMOTE_ADDR'])
+					);
+				}
+			}
+
+			/**
+			 * Chatpresence continued... if somebody hasn't pinged recently, they've most likely left the page
+			 * and shouldn't count as online anymore. We allow an expection for bots.
+			 */
+			q("delete from chatpresence where cp_last < %s - INTERVAL %s and cp_client != 'auto' ",
+				db_utcnow(),
+				db_quoteinterval('3 MINUTE')
+			);
+
+			$x = q("SELECT v FROM xconfig WHERE xchan = '%s' AND cat = 'sse' AND k = 'notifications'",
+				dbesc(self::$ob_hash)
+			);
+
+			if($x) {
+				$result = unserialize($x[0]['v']);
+			}
+
+			if($result) {
+				echo "event: notifications\n";
+				echo 'data: ' . json_encode($result);
+				echo "\n\n";
+
+				set_xconfig(self::$ob_hash, 'sse', 'notifications', []);
+				set_xconfig(self::$ob_hash, 'sse', 'timestamp', datetime_convert());
+				unset($result);
+			}
+
+			// always send heartbeat to detect disconnected clients
+			echo "event: heartbeat\n";
+			echo 'data: {}';
+			echo "\n\n";
+
+			ob_end_flush();
+			flush();
+
+			if(connection_status() != CONNECTION_NORMAL || connection_aborted()) {
+				//TODO: this does not seem to be triggered
+				set_xconfig(self::$ob_hash, 'sse', 'timestamp', NULL_DATE);
+				break;
+			}
+
+			sleep($sleep_seconds);
+
+		}
+
+	}
+
+}