Unreal_Engine_G_App_Auth_Plugin

Introduction

Unreal Plugin for Google's OAuth 2.0 endpoints to authorize access to Google APIs. Based on GAppAuth Android library

Features

Support user to login by Google on Android devices that uses the Google's Oauth 2.0 endpoints ➞ can work well on devices that do not support Google Play Services

Integrating into your Unreal Engine Project

Create the OAuth2 client ID for Google Sign In

You can use the quick-start configurator or set up directly on the Google Developer console or refer to this guide

Prepare for development

Install the plugin

Copy and enable the Unreal Engine Plugin. If a <unreal_project_directory>/Plugins folder does not exist, create it. From the GAppAuth Unreal plugin, copy the GAppAuth folder and its contents to <unreal_project_directory>/Plugins. From your Unreal Editor, select Edit ➞ Plugins menu then enable the GAppAuth Plugin.

Set up the package name

Set the package name in Edit ➞ Project Settings ➞ Android ➞ APK Packaging ➞ Android Package Name The package name needs to be same with your OAuth2.0 Client IDs You can also complete the rest of the settings here, such as version number, icons, resolution, etc.

Set up the finger print

Use this below command to get the fingerprint information

keytool -keystore path-to-debug-or-production-keystore -list -v

Then copy the SHA1 value and paste it in the OAuth2.0 Client ID setting

Set up the Google client ID prefix

Access to the Google Developer console, select your project then click on your OAuth2.0 Client ID then copy the prefix string before the .apps.googleusercontent.com Next, open the Unreal Engine Editor, select Edit ➞ Project Settings ➞ Plugins ➞ GAppAuth then paste the prefix string in the above step into the Client Id Prefix text box

Developing with the SDK

Using the Blueprint

The below functions are supported with Blueprint

login
logout You can refer to the Blueprint sample.

Using C++ APIs

Access the GAppAuth APIs by including the header file Account.h in the related classes of your project.

#include "GAccount.h"

gAppAuth::Account::login();

Log out

Sample code

gAppAuth::Account::logout();

Listen to callback events Implement a listener class to receive information in all the Account callback events

Sample code Header file

class YourAccountListener : public gAppAuth::AccountListener {
public:
    YourAccountListener();
    
    virtual void onLoginSuccess(const gAppAuth::GAccountInfo account) override;
    virtual void onLoginFailure(const FString message);
    virtual void onLogoutSuccess() override;
    virtual void onLogoutFailure(const FString message) override;
}

Then set it with the setListener API