gistfile1.txt

//Under Facebook.m
- (void)authorizeWithFBAppAuth:(BOOL)tryFBAppAuth
                    safariAuth:(BOOL)trySafariAuth {
    
    //Disable Facebook App Auth and only use native popup auth
	tryFBAppAuth = NO;
	trySafariAuth = NO;
	 
  NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                 _appId, @"client_id",
                                 @"user_agent", @"type",
                                 kRedirectURL, @"redirect_uri",
                                 @"touch", @"display",
                                 kSDKVersion, @"sdk",
                                 nil];

  NSString *loginDialogURL = [kDialogBaseURL stringByAppendingString:kLogin];

  if (_permissions != nil) {
    NSString* scope = [_permissions componentsJoinedByString:@","];
    [params setValue:scope forKey:@"scope"];
  }

  // If the device is running a version of iOS that supports multitasking,
  // try to obtain the access token from the Facebook app installed
  // on the device.
  // If the Facebook app isn't installed or it doesn't support
  // the fbauth:// URL scheme, fall back on Safari for obtaining the access token.
  // This minimizes the chance that the user will have to enter his or
  // her credentials in order to authorize the application.
	
  BOOL didOpenOtherApp = NO;
  UIDevice *device = [UIDevice currentDevice];
  if ([device respondsToSelector:@selector(isMultitaskingSupported)] && [device isMultitaskingSupported]) {
    if (tryFBAppAuth) {
      NSString *fbAppUrl = [FBRequest serializeURL:kFBAppAuthURL params:params];
      didOpenOtherApp = [[UIApplication sharedApplication] openURL:[NSURL URLWithString:fbAppUrl]];
    }

    if (trySafariAuth && !didOpenOtherApp) {
      NSString *nextUrl = [NSString stringWithFormat:@"fb%@://authorize", _appId];
      [params setValue:nextUrl forKey:@"redirect_uri"];

      NSString *fbAppUrl = [FBRequest serializeURL:loginDialogURL params:params];
      didOpenOtherApp = [[UIApplication sharedApplication] openURL:[NSURL URLWithString:fbAppUrl]];
    }
  }

  // If single sign-on failed, open an inline login dialog. This will require the user to
  // enter his or her credentials.
  if (!didOpenOtherApp) {
    [_loginDialog release];
    _loginDialog = [[FBLoginDialog alloc] initWithURL:loginDialogURL
                                          loginParams:params
                                             delegate:self];
    [_loginDialog show];
  }
}

/**
 * A private function for parsing URL parameters.
 */
- (NSDictionary*)parseURLParams:(NSString *)query {
	NSArray *pairs = [query componentsSeparatedByString:@"&"];
	NSMutableDictionary *params = [[[NSMutableDictionary alloc] init] autorelease];
	for (NSString *pair in pairs) {
		NSArray *kv = [pair componentsSeparatedByString:@"="];
		NSString *val =
    [[kv objectAtIndex:1]
     stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

		[params setObject:val forKey:[kv objectAtIndex:0]];
	}
  return params;
}