Use random string for securing socketIO pn iOS

packages/mobile/ios/Quiet/AppDelegate.m

@@ -95,6 +95,19 @@ - (void) createDataDirectory {
  self.dataPath = [dataDirectory create];
 }
 
+ NSString* randomStringWithLength(int length) {
+ NSString *letters = @"0123456789";
+ NSMutableString *randomString = [NSMutableString stringWithCapacity:length];
+
+ for (int i=0; i<length; i++) {
+ uint32_t rand = arc4random_uniform((uint32_t)[letters length]);
+ unichar character = [letters characterAtIndex:rand];
+ [randomString appendFormat:@"%C", character];
+ }
+
+ return randomString;
+ }
+
 - (void) initWebsocketConnection {
  /*
  * We have to wait for RCTBridge listeners to be initialized, yet we must be sure to deliver the event containing data port information.
@@ -116,7 +129,7 @@ - (void) spinupBackend:(BOOL)init {
  FindFreePort *findFreePort = [FindFreePort new];
 
  self.dataPort = [findFreePort getFirstStartingFromPort:11000];
- self.socketIOSecret = @"SECRET";
+ self.socketIOSecret = randomStringWithLength(20);
 
  uint16_t socksPort = [findFreePort getFirstStartingFromPort:12000];
  uint16_t controlPort = [findFreePort getFirstStartingFromPort:14000];