Mobile Authentication Android

Wraps Red Hat Single Sign-On OAuth2 authorization code flow and token management with an easy to use authentication client.

Requirements

MobileAuthentication supports Android API 23 and above so AES encryption can be used.

Getting Started

project build.gradle:

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

app build.gradle:

dependencies {
	implementation "com.github.bcgov:mobile-authentication-android:<LATEST_VERSION>"
}

Prerequisites

A Red Hat Single Sign-On server component that is setup to handle an OAuth2 authorization code flow.

Android Manifest

You will need to add this to your AndroidManifest and specify what custom schema you're using in your redirectUri.

<activity android:name="ca.bc.gov.mobileauthentication.screens.redirect.RedirectActivity"
	android:launchMode="singleInstance">
	<intent-filter android:autoVerify="true">
		<action android:name="android.intent.action.VIEW" />
		<category android:name="android.intent.category.DEFAULT" />
		<category android:name="android.intent.category.BROWSABLE" />
		<data android:scheme="<YOUR_CUSTOM_SCHEME_USED_IN_REDIRECT_URI>" />
	</intent-filter>
</activity>

Usage

There are four main commands for handling tokens that will be called using the MobileAuthenticationClient class.

1. Authenticate
2. Get Token
3. Refresh Token
4. Delete Token

Mobile Authentication Client

Creating a MobileAuthenticationClient:

val authEndpoint = "<YOUR_BASE_URL>/auth/realms/<YOUR_REALM_NAME>/protocol/openid-connect/auth"
val baseUrl = "<YOUR_BASE_URL>"
val clientId = "<YOUR_CLIENT_ID>"
val realmName = "<YOUR_REALM_NAME>"
val redirectUri = "<YOUR_REDIRECT_URI>"
val hint = "idir"

val client = MobileAuthenticationClient(context, baseUrl, realmName, authEndpoint, redirectUri, clientId, hint)

The parameters needed for the client can all be found on your Red Hat Single Sign-On dashboard.

The hint param is optional and can be used to directly send the user to the specified login.

We recommened you use a custom application schema for your redirectUri such as <NAME_OF_YOUR_APP>://android

Please use the context of the activity in which you are going to call authenticate to create the client.

Please remember to call client.clear() in either onPause(), onStop() or onDestroy() in order to avoid memory leaks.

Authenticate

Authenticate will get a fresh token from Red Hat Single Sign-On after the user has entered their login credentials through a Chrome custom tab and store it locally.

The result of the authenticate call can be retrieved in the onActivityResult() where the client was created.

Calling authenticate:

client?.authenticate(<OPTIONAL_REQUEST_CODE>)

OnActivityResult:

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
	super.onActivityResult(requestCode, resultCode, data)
	client?.handleAuthResult(requestCode, resultCode, data, object: MobileAuthenticationClient.TokenCallback {
		override fun onError(throwable: Throwable) {
			Log.e(tag, throwable.message)
		}
		override fun onSuccess(token: Token) {
			Log.d(tag, "Authenticate Success")
		}
	})
}

Get Token

Get token will get the token from local storage.

If the token is expired and the refresh token is NOT expired the token will automatically be refreshed, saved locally and returned.

Exceptions:

1. If there is no token locally a TokenNotFoundException will be thrown in the onError of the TokenCallback. This means the user has not yet been authenticated so no token exists locally.
2. If the token's refresh token is expired a RefreshExpiredException will be thrown in the onError of the TokenCallback. In this case the user will need to reauthenticate.
3. If the token does not have a refresh token then a NoRefreshTokenException will be thrown in the onError of the TokenCallback. This means the Token data being returned does not contain the required refreshToken for this lib to work.

Calling getToken:

client?.getToken(object: MobileAuthenticationClient.TokenCallback {
	override fun onError(throwable: Throwable) {
		when (throwable) {
			is RefreshExpiredException -> {
				Log.e(tag, "Refresh token is expired. Please re-authenticate.")
			}
			is NoRefreshTokenException -> {
				Log.e(tag, "No Refresh token associated with Token")
			}
			is TokenNotFoundException -> {
				Log.e(tag, "No Token was found. Please authenticate first.")
			}
		}
	}

	override fun onSuccess(token: Token) {
		Log.d(tag, "Get Token Success")
	}
})

Refresh Token

Refresh token will refresh the locally stored token.

Exceptions:

1. If the token's refresh token is expired a RefreshExpiredException will be thrown in the onError of the TokenCallback. In this case the user will need to reauthenticate.
2. If the token does not have a refresh token then a NoRefreshTokenException will be thrown in the onError of the TokenCallback. This means the Token data being returned does not contain the required refreshToken for this lib to work.

Calling refreshToken:

client?.refreshToken(object: MobileAuthenticationClient.TokenCallback {
	override fun onError(throwable: Throwable) {
		when (throwable) {
			is RefreshExpiredException -> {
				Log.e(tag, "Refresh token is expired. Please re-authenticate.")
			}
			is NoRefreshTokenException -> {
				Log.e(tag, "No Refresh token associated with Token")
			}
		}
	}

	override fun onSuccess(token: Token) {
		Log.d(tag, "Refresh Token Success")
		deleteToken()
	}
})

Delete Token

Delete token will delete the locally stored token.

Calling deleteToken:

client?.deleteToken(object: MobileAuthenticationClient.DeleteCallback {
    override fun onError(throwable: Throwable) {
        Log.e(tag, throwable.message)
    }
    override fun onSuccess() {
        Log.d(tag, "Delete Token Success")
    }
})

RxJava2

If you are using RxJava2 you can use getTokenAsObservable(), refreshTokenAsObservable() and deleteTokenAsObservable() in replace of the TokenCallback and DeleteCallback. Note that TokenNotFoundException in getToken will be replaced with NoSuchElementException when using getTokenAsObservable.

License

Copyright 2018 Province of British Columbia

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at 

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License