FirebaseGoogleOAuth.kt

package com.siddhantkushwaha.falcon.common

import android.app.Activity
import android.util.Log
import com.google.android.gms.auth.api.signin.GoogleSignIn
import com.google.android.gms.auth.api.signin.GoogleSignInClient
import com.google.android.gms.auth.api.signin.GoogleSignInOptions
import com.google.android.gms.common.api.ApiException
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.GoogleAuthProvider
import com.siddhantkushwaha.falcon.R
import com.siddhantkushwaha.falcon.activity.ActivityBase


object FirebaseGoogleAuth {

    private val tag = javaClass.toString()

    private fun getGoogleSignInClient(activity: Activity): GoogleSignInClient {
        val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken(activity.getString(R.string.default_web_client_id)).requestEmail()
            .build()
        return GoogleSignIn.getClient(activity, gso)
    }

    private fun signIn(activity: Activity, idToken: String, callback: (Boolean) -> Unit) {
        val credential = GoogleAuthProvider.getCredential(idToken, null)
        val fireBaseAuth = FirebaseAuth.getInstance()
        fireBaseAuth.signInWithCredential(credential).addOnCompleteListener(activity) { task ->
            if (task.isSuccessful) {
                callback(true)
            } else {
                Log.w(tag, "Sign in failed.", task.exception)
                callback(false)
            }
        }
    }

    public fun getEmail(): String? {
        val fireBaseAuth = FirebaseAuth.getInstance()
        return fireBaseAuth.currentUser?.email
    }

    public fun startLogin(activity: ActivityBase, callback: (Boolean) -> Unit) {
        val signInIntent = getGoogleSignInClient(activity).signInIntent
        activity.startActivityForResult(signInIntent, RequestCodes.REQUEST_CODE_SIGN_IN) { data ->
            val task = GoogleSignIn.getSignedInAccountFromIntent(data)
            try {
                val account = task.getResult(ApiException::class.java)!!
                val token = account.idToken!!
                signIn(activity, token, callback)
            } catch (e: ApiException) {
                Log.e(tag, "Firebase log in failed.", e)
                callback(false)
            }
        }
    }

    public fun signOut() {
        val fireBaseAuth = FirebaseAuth.getInstance()
        fireBaseAuth.signOut()
    }
}