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Google+ Login - A Primer

❖ Overview ❖ How Does OAuth 2.0 Work? ❖ Setting up Project ❖ Google Play Services

Topics

Overview❖ Sharing passwords ❖ No cross-federated authentication ❖ Everybody had their own username/

password

❖ Provides authentication flows for web, desktop, and mobile.

❖ User authentication is delegate to an HTTP services such as Google.

❖ Relies on informed user consent and tokens

OAuth 2.0 to the Rescue

User  Login  &  Consent

Request  Token

Mobile  App

Authorization  Code

Call  Google  API  with  Token

Access  TokenRefresh  Token

Exchange  Code  for  Token

Google has their own OAuth 2Using Google Play Services

❖ Nobody wants to create “Yet Another Login”

❖ Hides a lot of the OAuth 2.0 details ❖ Provides a standard, native experience ❖ Authentication is a Hard Thing

❖ In other words, we’re lazy…

Why Use Google+ Login?

Creating an API Projecthttps://console.developers.google.com/project

SHA1 Fingerprint

Create a Google API Project

Enable the Google+ API

Create Client ID

Now For the CodeAdding Google+ Authentication to a Xamarin.Android App.

① Add Google Play Services to the Android Project ② Update Android Permissions ③ Add Google+ Sign-in Button to UI ④ Initialize a GoogleApiClient ⑤ Respond to callbacks from the GoogleApiClient

Checklist

Show Me The Code!

❖ Source Codehttps://github.com/topgenorth/gplus-quickstart-xamarin.android

❖ Google Developer Consolehttps://console.developers.google.com/

❖ Start integrating Google+ into your Android app https://developers.google.com/+/mobile/android/getting-started

❖ Google+ Sign-in for Android https://developers.google.com/+/mobile/android/sign-in

❖ Google+ Platform Developer Policies https://developers.google.com/+/policies

References

❖ OAuth2 Crash Course ❖ Creating the Google API Project ❖ Examined Working Code

Summary