Start to add support for incognito mode

src/controllers/FriendsController.ts

@@ -220,7 +220,9 @@ export class FriendsController {
 			ID_friend: friend.friendID,
 			accepted: friend.accepted ? 1 : 0,
 			time_last_activity: 
-				UserWebSocketController.IsConnected(friend.friendID) ? time() : friend.lastActivityTime
+				UserWebSocketController.IsConnected(friend.friendID) &&
+				!UserWebSocketController.IsIcognito(friend.friendID)
+				 ? time() : friend.lastActivityTime
 		}
 
 		if(full) {

src/controllers/UserWebSocketController.ts

@@ -19,14 +19,16 @@ interface PendingRequests {
 	time: number,
 	clientID: number,
 	userID: number, 
-	token: string
+	token: string,
+	incognito: boolean
 }
 
 export interface ActiveClient {
 	socketID: string,
 	clientID: number,
 	userID: number,
-	ws: ws
+	ws: ws,
+	incognito: boolean
 }
 
 // Tokens are valid only 10 seconds after they are generated
@@ -70,7 +72,8 @@ export class UserWebSocketController {
 			time: time(),
 			clientID: h.getClientInfo().id,
 			userID: h.getUserId(),
-			token: token
+			token: token,
+			incognito: h.postBool("incognito", false)
 		});
 
 		h.send({
@@ -114,7 +117,8 @@ export class UserWebSocketController {
 			socketID: randomStr(30),
 			clientID: entry.clientID,
 			userID: entry.userID,
-			ws: ws
+			ws: ws,
+			incognito: entry.incognito
 		}
 		this.active_clients.push(client);
 
@@ -228,6 +232,16 @@ export class UserWebSocketController {
 		return this.active_clients.find((e) => e.userID == userID) != undefined;
 	}
 
+	/**
+	 * Check out whether a has all its connections marked as incognito
+	 * 
+	 * @param userID Target user ID
+	 */
+	public static IsIcognito(userID: number) : boolean {
+		return this.IsConnected(userID)
+			&& this.active_clients.find(e => e.userID == userID && !e.incognito) == undefined;
+	}
+
 	/**
 	 * Send updated notifications number to some users
 	 *