googleAuth.js

import { GoogleSignin as GS } from 'react-native-google-signin'

import configuration from '../configuration_public.json'

async function checkForPlayServices() {
  let hasPlayServices = false

  try {
    hasPlayServices = await GS.hasPlayServices({autoResolve: true})
  } catch(e) {
    console.warn('Play service availability check failed', e)
  }

  console.debug(`Play services availaible: ${hasPlayServices}`)

  return hasPlayServices
}

async function configure(configOverrides={}) {
  await checkForPlayServices()
  const googleSSOConfig = {
    ...configuration.common.google.sso_config,
    webClientId: configuration.common.google.web.id
  }

  return await GS.configure({...googleSSOConfig, ...configOverrides})
}

export async function login(configuration={}) {
  let signInAborted = false, currentUser

  await configure(configuration)

  try {
    currentUser = await GS.currentUserAsync() || await GS.signIn()
  } catch(e) {
    signInAborted = e.code == 12501 || e.code == -5

    if (!signInAborted) {
      throw e
    }
  }

  signInAborted && console.log('Google Sign In aborted')

  return currentUser
}

export async function logout() {
  await configure()

  if (!await GS.currentUserAsync()) return true

  return await GS.signOut()
}