How to authenticate a user in Parse iOS SDK using OAuth?

Question

Parse Server offers OAuth authentication. How can I use the Parse Server's predefined OAuth modules, e.g. Facebook, to sign up a new user or login an existing user of the '_User' class?

The Parse Server docs give examples on how to configure the OAuth modules. But how do I use it in an iOS project to login or signup a user?

Answer 1

1, create a class extends from both NSObject and PFUserAuthenticationDelegate.

class AuthDelegate:NSObject, PFUserAuthenticationDelegate {
    func restoreAuthenticationWithAuthData(authData: [String : String]?) -> Bool {
        return true
    }
}

2, register this authentication delegate

// parmeter 'forAuthType' is the name of file defined in 
// https://github.com/parse-community/parse-server/blob/master/src/Adapters/Auth/index.js
// such as: google, github, linkedin ......
PFUser.registerAuthenticationDelegate(AuthDelegate(), forAuthType: "google")

3, using PFUser.logInWithAuthTypeInBackground method to store user info to _User

// for google oauth, authData format will be
// ["id":"PUT_USER_ID_HERE","accesstoken":"PUT_TOKEN_HERE"]
PFUser.logInWithAuthType(inBackground: "google", authData:[.....])

4, you will see a record is created in _User, with only objectId and authData