Use parse and Facebook's SDK to login in users from a specific college

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iOS

Xcode

Swift

Hi,

I have some idea how to code to login facebook users. But I want to only accept users from certain colleges. I know schools have their own Facebook accounts students sign in through. I thought I could adjust the code below some how? Or maybe I can use some thing like

if emailString.rangeOfString("@collge.KSU.edu") == nil { print("Must be KSU email.") }

which isn't secure but it would allow a filter.

- (void)_loginWithFacebook {
    // Set permissions required from the facebook user account
    NSArray *permissionsArray = @[ @"user_about_me", @"user_relationships", @"user_birthday", @"user_location"];

    // Login PFUser using Facebook
    [PFFacebookUtils logInInBackgroundWithReadPermissions:permissionsArray block:^(PFUser *user, NSError *error) {
      if (!user) {
        NSLog(@"Uh oh. The user cancelled the Facebook login.");
      } else if (user.isNew) {
        NSLog(@"User signed up and logged in through Facebook!");
      } else {
        NSLog(@"User logged in through Facebook!");
      }
    }];
}