React Native Fingerprint Scanner is a React Native library for authenticating users with Fingerprint (TouchID).

iOS Version

The usage of the TouchID is based on a framework, named Local Authentication.

It provides a Default View that prompts the user to place a finger to the iPhone’s button for scanning.

Android Version

Using an expandable Android Fingerprint API library, which combines Samsung and MeiZu‘s official Fingerprint API.

Samsung and MeiZu’s Fingerprint SDK supports most devices which system versions less than Android 6.0.

Table of Contents

Installation

$ npm install react-native-fingerprint-scanner --save

Automatic Configuration

$ react-native link react-native-fingerprint-scanner

Manual Configuration

iOS

  1. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
  2. Go to node_modules ➜ react-native-fingerprint-scanner and add ReactNativeFingerprintScanner.xcodeproj
  3. In XCode, in the project navigator, select your project. Add libReactNativeFingerprintScanner.a to your project’s Build Phases ➜ Link Binary With Libraries
  4. Run your project (Cmd+R)

Android

  1. Open up android/app/src/main/java/[...]/MainActivity.java
  • Add import com.hieuvp.fingerprint.ReactNativeFingerprintScannerPackage; to the imports at the top of the file
  • Add new ReactNativeFingerprintScannerPackage() to the list returned by the getPackages() method
  1. Append the following lines to android/settings.gradle:include ':react-native-fingerprint-scanner' project(':react-native-fingerprint-scanner').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-fingerprint-scanner/android')
  2. Insert the following lines inside the dependencies block in android/app/build.gradle:compile project(':react-native-fingerprint-scanner')

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>$(PRODUCT_NAME) requires FaceID access to allows you quick and secure access.</string>

Extra Configuration

  1. Make sure the following versions are all correct in android/app/build.gradleandroid { compileSdkVersion 25 buildToolsVersion "25.0.3" ... defaultConfig { targetSdkVersion 25
  2. Add necessary rules to android/app/proguard-rules.pro# MeiZu Fingerprint -keep class com.fingerprints.service.** { *; } -dontwarn com.fingerprints.service.** # Samsung Fingerprint -keep class com.samsung.android.sdk.** { *; } -dontwarn com.samsung.android.sdk.**

Example

Example Source Code

iOS Implementation

import React, { Component, PropTypes } from 'react';
import { AlertIOS } from 'react-native';
import FingerprintScanner from 'react-native-fingerprint-scanner';

class FingerprintPopup extends Component {

  componentDidMount() {
    FingerprintScanner
      .authenticate({ description: 'Scan your fingerprint on the device scanner to continue' })
      .then(() => {
        this.props.handlePopupDismissed();
        AlertIOS.alert('Authenticated successfully');
      })
      .catch((error) => {
        this.props.handlePopupDismissed();
        AlertIOS.alert(error.message);
      });
  }

  render() {
    return false;
  }
}

FingerprintPopup.propTypes = {
  handlePopupDismissed: PropTypes.func.isRequired,
};

export default FingerprintPopup;

Android Implementation

import React, { Component, PropTypes } from 'react';
import {
  Alert,
  Image,
  Text,
  TouchableOpacity,
  View,
  ViewPropTypes
} from 'react-native';
import FingerprintScanner from 'react-native-fingerprint-scanner';

import ShakingText from './ShakingText.component';
import styles from './FingerprintPopup.component.styles';

class FingerprintPopup extends Component {

  constructor(props) {
    super(props);
    this.state = { errorMessage: undefined };
  }

  componentDidMount() {
    FingerprintScanner
      .authenticate({ onAttempt: this.handleAuthenticationAttempted })
      .then(() => {
        this.props.handlePopupDismissed();
        Alert.alert('Fingerprint Authentication', 'Authenticated successfully');
      })
      .catch((error) => {
        this.setState({ errorMessage: error.message });
        this.description.shake();
      });
  }

  componentWillUnmount() {
    FingerprintScanner.release();
  }

  handleAuthenticationAttempted = (error) => {
    this.setState({ errorMessage: error.message });
    this.description.shake();
  };

  render() {
    const { errorMessage } = this.state;
    const { style, handlePopupDismissed } = this.props;

    return (
      <View style={styles.container}>
        <View style={[styles.contentContainer, style]}>

          <Image
            style={styles.logo}
            source={require('./assets/finger_print.png')}
          />

          <Text style={styles.heading}>
            Fingerprint{'\n'}Authentication
          </Text>
          <ShakingText
            ref={(instance) => { this.description = instance; }}
            style={styles.description(!!errorMessage)}>
            {errorMessage || 'Scan your fingerprint on the\ndevice scanner to continue'}
          </ShakingText>

          <TouchableOpacity
            style={styles.buttonContainer}
            onPress={handlePopupDismissed}
          >
            <Text style={styles.buttonText}>
              BACK TO MAIN
            </Text>
          </TouchableOpacity>

        </View>
      </View>
    );
  }
}

FingerprintPopup.propTypes = {
  style: ViewPropTypes.style,
  handlePopupDismissed: PropTypes.func.isRequired,
};

export default FingerprintPopup;

API

isSensorAvailable(): (Android, iOS)

Checks if Fingerprint Scanner is able to be used by now.

  • Returns a Promise<string>
  • biometryType: String – The type of biometric authentication supported by the device.
  • error: FingerprintScannerError { name, message } – The reason of failure.
componentDidMount() {
  FingerprintScanner
    .isSensorAvailable()
    .then(biometryType => this.setState({ biometryType }))
    .catch(error => this.setState({ errorMessage: error.message }));
}

authenticate({ description, fallbackEnabled }): (iOS)

Starts Fingerprint authentication on iOS.

  • Returns a Promise
  • description: String – the string to explain the request for user authentication.
  • fallbackEnabled: Boolean – default to true, whether to display fallback button (e.g. Enter Password).
componentDidMount() {
  FingerprintScanner
    .authenticate({ description: 'Scan your fingerprint on the device scanner to continue' })
    .then(() => {
      this.props.handlePopupDismissed();
      AlertIOS.alert('Authenticated successfully');
    })
    .catch((error) => {
      this.props.handlePopupDismissed();
      AlertIOS.alert(error.message);
    });
}

authenticate({ onAttempt }): (Android)

Starts Fingerprint authentication on Android.

  • Returns a Promise
  • onAttempt: Function – a callback function when users are trying to scan their fingerprint but failed.
componentDidMount() {
  FingerprintScanner
    .authenticate({ onAttempt: this.handleAuthenticationAttempted })
    .then(() => {
      this.props.handlePopupDismissed();
      Alert.alert('Fingerprint Authentication', 'Authenticated successfully');
    })
    .catch((error) => {
      this.setState({ errorMessage: error.message });
      this.description.shake();
    });
}

release(): (Android)

Stops fingerprint scanner listener and optimizes memory.

  • Returns a Void
componentWillUnmount() {
  FingerprintScanner.release();
}

Types of Biometrics

ValueOS
Touch IDiOS
Face IDiOS
FingerprintAndroid

Errors

NameMessage
AuthenticationNotMatchNo match
AuthenticationFailedAuthentication was not successful because the user failed to provide valid credentials
UserCancelAuthentication was canceled by the user – e.g. the user tapped Cancel in the dialog
UserFallbackAuthentication was canceled because the user tapped the fallback button (Enter Password)
SystemCancelAuthentication was canceled by system – e.g. if another application came to foreground while the authentication dialog was up
PasscodeNotSetAuthentication could not start because the passcode is not set on the device
FingerprintScannerNotAvailableAuthentication could not start because Fingerprint Scanner is not available on the device
FingerprintScannerNotEnrolledAuthentication could not start because Fingerprint Scanner has no enrolled fingers
FingerprintScannerUnknownErrorCould not authenticate for an unknown reason
FingerprintScannerNotSupportedDevice does not support Fingerprint Scanner
DeviceLockedAuthentication was not successful, the device currently in a lockout of 30 seconds

License

MIT