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Xamarin Monkeys: Xamarin.Forms - Fingerprint Authentication in your App

 4 years ago
source link: https://xamarinmonkeys.blogspot.com/2021/02/xamarinforms-fingerprint-authentication.html
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Xamarin.Forms - Fingerprint Authentication in your App

In this blog post, you will learn how to implement fingerprint, password and face-lock Authentication in your XamarinApp.

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Introduction

Xamarin.Forms code runs on multiple platforms - each of which has its own filesystem. This means that reading and writing files is most easily done using the native file APIs on each platform. Alternatively, embedded resources are a simpler solution to distribute data files with an app.

Plugin.Fingerprint

Authenticate a user via fingerprint, face id or any other biometric / local authentication method from a cross platform API.

Prerequisites

  • Visual Studio 2017 or later (Windows or Mac)

Setting up a Xamarin.Forms Project

Start by creating a new Xamarin.Forms project. You wíll learn more by going through the steps yourself.Create a new or existing Xamarin forms(.Net standard) Project. With Android and iOS Platform. 

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Nuget

Install the following Nuget from Nuget Manager In your Visual Studio.

Plugin.Fingerprint

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iOS Setup

Add NSFaceIDUsageDescription to your Info.plist to describe the reason your app uses Face ID. Otherwise the App will crash when you start a Face ID authentication on iOS 11.3+.

<key>NSFaceIDUsageDescription</key>

<string>Need your face to unlock secrets!</string>

Android Setup

Request the permission in AndroidManifest.xml

<uses-permission android:name="android.permission.USE_FINGERPRINT" />

Add below code in MainActivity.cs OnCreate Method.

CrossFingerprint.SetCurrentActivityResolver(() => this);

Install Android X Migration

Since version 2, this plugin uses Android X. You have to install Xamarin.AndroidX.Migration in your Android project.

FingerPrint Authentication

private async Task AuthenticateAsync(string reason, string cancel = null, string fallback = null, string tooFast = null) { _cancel = false ? new CancellationTokenSource(TimeSpan.FromSeconds(10)) : new CancellationTokenSource(); var dialogConfig = new AuthenticationRequestConfiguration("My App", reason) { CancelTitle = cancel, FallbackTitle = fallback, AllowAlternativeAuthentication = true, ConfirmationRequired = false };

dialogConfig.HelpTexts.MovedTooFast = tooFast; var result = await Plugin.Fingerprint.CrossFingerprint.Current.AuthenticateAsync(dialogConfig, _cancel.Token); await SetResultAsync(result); }

Enable AlternativeAuthentication

If need to allow alternate authentication such as Pin, Pattern and password set AlternativeAuthentication=true

var dialogConfig = new AuthenticationRequestConfiguration("My App", reason) { CancelTitle = cancel, FallbackTitle = fallback, AllowAlternativeAuthentication = true, ConfirmationRequired = false };

Full code

protected override async void OnAppearing() { base.OnAppearing();

var authType= await Plugin.Fingerprint.CrossFingerprint.Current.GetAuthenticationTypeAsync(); if(authType==AuthenticationType.Fingerprint) { lblAuthenticationType.Text = "Auth Type: " + authType;

await AuthenticateAsync("Authendicate with Touch ID"); } }

private async Task AuthenticateAsync(string reason, string cancel = null, string fallback = null, string tooFast = null) { _cancel = false ? new CancellationTokenSource(TimeSpan.FromSeconds(10)) : new CancellationTokenSource(); var dialogConfig = new AuthenticationRequestConfiguration("My App", reason) { CancelTitle = cancel, FallbackTitle = fallback, AllowAlternativeAuthentication = true, ConfirmationRequired = false };

dialogConfig.HelpTexts.MovedTooFast = tooFast; var result = await Plugin.Fingerprint.CrossFingerprint.Current.AuthenticateAsync(dialogConfig, _cancel.Token); await SetResultAsync(result); }

Run

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I hope you have understood you will learn how to implement fingerprint, password and facelock Authentication in your XamarinApp.

Thanks for reading. Please share your comments and feedback. Happy Coding :)


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