React Native Touch ID

React Native Touch ID is a React Native library for authenticating users with biometric authentication methods like Face ID and Touch ID on both iOS and Android (experimental).

Note: the awesome folks over at Expo have begun open-sourcing some of their modules for compatability with React Native projects not built with Expo. As such you can attempt to use their equivalent library called LocalAuthentication at expo-local-authentication if you run into any issues here!

Documentation

• Install
• Usage
• Example
• Fallback
• Methods
• Errors
• License

Install

npm i --save react-native-touch-id

or

yarn add react-native-touch-id

Support

Due to the rapid changes being made in the React Native ecosystem, we are not officially going to support this module on anything but the latest version of React Native. The current supported version is indicated on the React Native badge at the top of this README. If it's out of date, we encourage you to submit a pull request!

Usage

Linking the Library

In order to use Biometric Authentication, you must first link the library to your project.

Using react-native link

Use the built-in command:

react-native link react-native-touch-id

Using Cocoapods (iOS only)

On iOS you can also link package by updating your podfile

pod 'TouchID', :path => "#{node_modules_path}/react-native-touch-id"

and then run

pod install

Using native linking

There's excellent documentation on how to do this in the React Native Docs.

Platform Differences

iOS and Android differ slightly in their TouchID authentication.

On Android you can customize the title and color of the pop-up by passing in the optional config object with a color and title key to the authenticate method. Even if you pass in the config object, iOS does not allow you change the color nor the title of the pop-up.

Error handling is also different between the platforms, with iOS currently providing much more descriptive error codes.

App Permissions

Add the following permissions to their respective files:

In your AndroidManifest.xml:

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

In your Info.plist:

<key>NSFaceIDUsageDescription</key>
<string>Enabling Face ID allows you quick and secure access to your account.</string>

Requesting Face ID/Touch ID Authentication

Once you've linked the library, you'll want to make it available to your app by requiring it:

var TouchID = require('react-native-touch-id');

or

import TouchID from 'react-native-touch-id'

Requesting Face ID/Touch ID Authentication is as simple as calling:

TouchID.authenticate('to demo this react-native component', optionalConfigObject)
  .then(success => {
    // Success code
  })
  .catch(error => {
    // Failure code
  });

Example

Using Face ID/Touch ID in your app will usually look like this:

import React from "react"
var TouchID = require('react-native-touch-id');
//or import TouchID from 'react-native-touch-id'

class YourComponent extends React.Component {
  _pressHandler() {
    TouchID.authenticate('to demo this react-native component', optionalConfigObject)
      .then(success => {
        AlertIOS.alert('Authenticated Successfully');
      })
      .catch(error => {
        AlertIOS.alert('Authentication Failed');
      });
  },

  render() {
    return (
      <View>
        ...
        <TouchableHighlight onPress={this._pressHandler}>
          <Text>
            Authenticate with Touch ID
          </Text>
        </TouchableHighlight>
      </View>
    );
  }
};

Methods

authenticate(reason, config)

Attempts to authenticate with Face ID/Touch ID. Returns a Promise object.

Arguments

• reason - optional - String that provides a clear reason for requesting authentication.

• config - optional - configuration object for more detailed dialog setup:

  • title - Android - title of confirmation dialog
  • color - Android - color of confirmation dialog
  • sensorDescription - Android - text shown next to the fingerprint image
  • cancelText - Android - cancel button text
  • fallbackLabel - iOS - by default specified 'Show Password' label. If set to empty string label is invisible.
  • unifiedErrors - return unified error messages (see below) (default = false)

Examples

const optionalConfigObject = {
  title: "Authentication Required", // Android
  color: "#e00606", // Android
  sensorDescription: "Touch sensor", // Android
  cancelText: "Cancel", // Android
  fallbackLabel: "Show Passcode", // iOS (if empty, then label is hidden)
  unifiedErrors: false // use unified error messages (default false)
}

TouchID.authenticate('to demo this react-native component', optionalConfigObject)
  .then(success => {
    AlertIOS.alert('Authenticated Successfully');
  })
  .catch(error => {
    AlertIOS.alert('Authentication Failed');
  });

isSupported()

Returns a Promise that rejects if TouchID is not supported. On iOS resolves with a biometryType String of FaceID or TouchID.

Examples

const optionalConfigObject = {
  unifiedErrors: false // use unified error messages (default false)
}

TouchID.isSupported(optionalConfigObject)
  .then(biometryType => {
    // Success code
    if (biometryType === 'FaceID') {
        console.log('FaceID is supported.');
    } else {
        console.log('TouchID is supported.');
    }
  })
  .catch(error => {
    // Failure code
    console.log(error);
  });

Errors

There are various reasons why biomentric authentication may not be available or fail. TouchID.isSupported and TouchID.authenticate will return an error representing the reason.

iOS Errors

Format:

{
  name: "TheErrorCode",
  message: "the error message",
  details: {
    name: "TheErrorCode",
    message: "the error message"
  }
}

name	message
LAErrorAuthenticationFailed	Authentication was not successful because the user failed to provide valid credentials.
LAErrorUserCancel	Authentication was canceled by the user—for example, the user tapped Cancel in the dialog.
LAErrorUserFallback	Authentication was canceled because the user tapped the fallback button (Enter Password).
LAErrorSystemCancel	Authentication was canceled by system—for example, if another application came to foreground while the authentication dialog was up.
LAErrorPasscodeNotSet	Authentication could not start because the passcode is not set on the device.
LAErrorTouchIDNotAvailable	Authentication could not start because Touch ID is not available on the device
LAErrorTouchIDNotEnrolled	Authentication could not start because Touch ID has no enrolled fingers.
RCTTouchIDUnknownError	Could not authenticate for an unknown reason.
RCTTouchIDNotSupported	Device does not support Touch ID.

More information on errors can be found in Apple's Documentation.

Android errors

Format:

{
  name: "Touch ID Error",
  message: "Touch ID Error",
  details: "the error message",
  code: "THE_ERROR_CODE"
}

isSupported:

name	message	details	code
Touch ID Error	Touch ID Error	Not supported.	NOT_SUPPORTED
Touch ID Error	Touch ID Error	Not supported.	NOT_AVAILABLE
Touch ID Error	Touch ID Error	Not supported.	NOT_PRESENT
Touch ID Error	Touch ID Error	Not supported.	NOT_ENROLLED

authenticate:

name	message	details	code
Touch ID Error	Touch ID Error	Not supported	NOT_SUPPORTED
Touch ID Error	Touch ID Error	Not supported	NOT_AVAILABLE
Touch ID Error	Touch ID Error	Not supported	NOT_PRESENT
Touch ID Error	Touch ID Error	Not supported	NOT_ENROLLED
Touch ID Error	Touch ID Error	failed	AUTHENTICATION_FAILED
Touch ID Error	Touch ID Error	cancelled	AUTHENTICATION_CANCELED
Touch ID Error	Touch ID Error	Too many attempts. Try again Later.	FINGERPRINT_ERROR_LOCKOUT
Touch ID Error	Touch ID Error	Too many attempts. Fingerprint sensor disabled.	FINGERPRINT_ERROR_LOCKOUT_PERMANENT
Touch ID Error	Touch ID Error	?	FINGERPRINT_ERROR_UNABLE_TO_PROCESS,
Touch ID Error	Touch ID Error	?	FINGERPRINT_ERROR_TIMEOUT,
Touch ID Error	Touch ID Error	?	FINGERPRINT_ERROR_CANCELED,
Touch ID Error	Touch ID Error	?	FINGERPRINT_ERROR_VENDOR,

Unified errors

Format:

{
  name: "TouchIDError",
  message: "the error message",
  code: "THE_ERROR_CODE"
}

name	message	code
TouchIDError	Authentication failed	AUTHENTICATION_FAILED
TouchIDError	User canceled authentication	USER_CANCELED
TouchIDError	System canceled authentication	SYSTEM_CANCELED
TouchIDError	Biometry hardware not present	NOT_PRESENT
TouchIDError	Biometry is not supported	NOT_SUPPORTED
TouchIDError	Biometry is not currently available	NOT_AVAILABLE
TouchIDError	Biometry is not enrolled	NOT_ENROLLED
TouchIDError	Biometry timeout	TIMEOUT
TouchIDError	Biometry lockout	LOCKOUT
TouchIDError	Biometry permanent lockout	LOCKOUT_PERMANENT
TouchIDError	Biometry processing error	PROCESSING_ERROR
TouchIDError	User selected fallback	USER_FALLBACK
TouchIDError	User selected fallback not enrolled	FALLBACK_NOT_ENROLLED
TouchIDError	Unknown error	UNKNOWN_ERROR

License

Copyright (c) 2015, Naoufal Kadhom

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.