@biopassid/face-sdk-react-native

BioPass ID Face SDK React Native

Latest Version

February 27, 2023 - [v0.1.24]

Table of Contents

• Quick Start Guide
  • Prerequisites
  • Installation
  • How to use
  • Callback
  • License
• FaceConfig
• FaceEvent
• Changelog
• License

Quick Start Guide

First, you will need a license key to use the SDK. You can acquire a license key when subscribing to a BioPass ID plan.

Check out our official documentation for more in depth information on BioPass ID.

1. Prerequisites:

	Android	iOS
Support	SDK 21+	iOS 13+

- A device with a camera
- License key
- Internet connection is required to verify the license

2. Installation

npm install @biopassid/face-sdk-react-native

Android

Change the minimum Android sdk version to 21 (or higher) in your android/app/build.gradle file.

minSdkVersion 21

Change the compile Android sdk version to 31 (or higher) in your android/app/build.gradle file.

compileSdkVersion 31

IOS

Requires iOS 13.0 or higher.

Add two rows to the ios/Info.plist:

• one with the key Privacy - Camera Usage Description and a usage description.
• and one with the key Privacy - Photo Library Usage Description and a usage description.

If editing Info.plist as text, add:

<key>NSCameraUsageDescription</key>
<string>Your camera usage description</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Your library usage description</string>

Then go into your project's ios folder and run pod install.

# Go into ios folder
$ cd ios

# Install dependencies
$ pod install

3. How to use

Basic Example

To call Face Capture in your React Native project is as easy as follow:

import React from "react";
import { StyleSheet, View, Button } from "react-native";
import {
  FaceConfigPreset,
  FaceConfigType,
  FaceEvent,
  buildCameraView,
  FaceCameraLensDirection,
} from "@biopassid/face-sdk-react-native";

export function App() {
  const config = FaceConfigPreset.getConfig(
    FaceConfigType.FACE_CAPTURE
  )
    .setLicenseKey("your-license-key")
    .setDefaultCameraPosition(FaceCameraLensDirection.FRONT)
    .setShowFlipCameraButton(true)
    .setStringsScreenTitle("Capturando Face")
    .setStylesOverlayColor("#CC000000");

  function callback(event: FaceEvent) {
    // handle Face return
    console.log(event.photo);
  }

  function handleButton() {
    buildCameraView(config, callback);
  };

  return (
    <View style={styles.container}>
      <Button onPress={handleButton} title="Capture Face" />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: "center",
    justifyContent: "center",
    backgroundColor: '#FFFFFF',
  },
});

Example using Fetch API to call the BioPass ID API

For this example we used Enroll from the Multibiometrics package.

Here, you will need an API key to be able to make requests to the BioPass ID API.

import React from 'react';
import {StyleSheet, View, Button} from 'react-native';
import {
  FaceConfigPreset,
  FaceConfigType,
  FaceEvent,
  buildCameraView,
} from '@biopassid/face-sdk-react-native';
import {Base64} from './utils/Base64';

export default function App() {
  // Instantiate Face config by passing your license key
  const config = FaceConfigPreset.getConfig(
    FaceConfigType.FACE_CAPTURE,
  ).setLicenseKey('your-license-key');

  // Handle Face callback
  async function callback(event: FaceEvent) {
    // Encode image to base64 string
    const imageBase64 = Base64.arrayBufferToBase64(event.photo);

    // Create headers passing your api key
    const headers = {
      'Content-Type': 'application/json',
      'Ocp-Apim-Subscription-Key': 'your-api-key',
    };

    // Create json body
    const body = JSON.stringify({
      Person: {
        CustomID: 'your-customID',
        Face: [{'Face-1': imageBase64}],
      },
    });

    // Execute request to BioPass ID API
    const response = await fetch(
      'https://api.biopassid.com/multibiometrics/enroll',
      {
        method: 'POST',
        headers,
        body,
      },
    );
    const data = await response.json();

    // Handle API response
    console.log('Response status: ', response.status);
    console.log('Response body: ', data);
  }

  // Build Face camera view
  function handleButton() {
    buildCameraView(config, callback);
  }

  return (
    <View style={styles.container}>
      <Button onPress={handleButton} title="Capture Face" />
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: '#FFFFFF',
  },
});

Base64 util

const chars =
  'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

export const Base64 = {
  btoa: (input: string = '') => {
    let str = input;
    let output = '';

    for (
      let block = 0, charCode, i = 0, map = chars;
      str.charAt(i | 0) || ((map = '='), i % 1);
      output += map.charAt(63 & (block >> (8 - (i % 1) * 8)))
    ) {
      charCode = str.charCodeAt((i += 3 / 4));

      if (charCode > 0xff) {
        throw new Error(
          "'btoa' failed: The string to be encoded contains characters outside of the Latin1 range.",
        );
      }

      block = (block << 8) | charCode;
    }

    return output;
  },

  arrayBufferToBase64: (buffer: ArrayBuffer) => {
    var binary = '';
    var bytes = new Uint8Array(buffer);
    bytes.forEach((item: number) => {
      binary += String.fromCharCode(item);
    });
    return Base64.btoa(binary);
  },
};

4. Callback

Setting the Callback

You can pass a function callback to receive the captured image. You can write you own callback following this example:

function callback(event: FaceEvent) {
  console.log('photo: ', event.photo);
  doSomething(event);
}

5. License

To use Face Capture you need a license key. To set the license key needed is simple as setting another attribute. Simply doing:

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
  .setLicenseKey('your-license-key');

FaceConfig

You can also use pre-build configurations on your application, so you can automatically start using multiples services and features that better suit your application. You can instantiate each one and use it's default properties, or if you prefer you can change every config available. Here are the types that are supported right now:

FaceCaptureConfig

Variable name	Type	Default value
licenseKey	string	""
cameraPreset	FaceCameraPreset	FaceCameraPreset.FACE_CAPTURE
defaultCameraPosition	FaceCameraLensDirection	FaceCameraLensDirection.FRONT
outputFormat	FaceOutputFormat	FaceOutputFormat.JPEG
captureButtonType	FaceCaptureButtonType	FaceCaptureButtonType.DEFAULT
showFlashButton	boolean	false
showFlipCameraButton	boolean	true
flashEnabledByDefault	boolean	false
showHelpText	boolean	true
showScreenTitle	boolean	true
autoCapture	boolean	true
autoCaptureTimeout	number	3000
strings	FaceStrings
styles	FaceStyles

ContinuousCaptureConfig

Variable name	Type	Default value
licenseKey	string	""
cameraPreset	FaceCameraPreset	FaceCameraPreset.FACE_CAPTURE
defaultCameraPosition	FaceCameraLensDirection	FaceCameraLensDirection.FRONT
outputFormat	FaceOutputFormat	FaceOutputFormat.JPEG
captureButtonType	FaceCaptureButtonType	FaceCaptureButtonType.DEFAULT
showFlashButton	boolean	false
showFlipCameraButton	boolean	false
flashEnabledByDefault	boolean	false
showHelpText	boolean	true
showScreenTitle	boolean	true
autoCapture	boolean	true
autoCaptureTimeout	number	1000
strings	FaceStrings
styles	FaceStyles

FaceStrings

Variable name	Type	Default value
screenTitle	string	"Capturando Face"
helpText	string	"Encaixe seu rosto no formato acima e aguarde o sinal verde"
loading	string	"Processando..."
customCaptureButtonText	string	"Capture Face"
noFaceDetectedMessage	string	"Nenhuma face detectada"
multipleFacesDetectedMessage	string	"Múltiplas faces detectadas"
detectedFaceIsCenteredMessage	string	"Mantenha o celular parado"
detectedFaceIsCloseMessage	string	"Afaste o rosto da câmera"
detectedFaceIsDistantMessage	string	"Aproxime o rosto da câmera"
detectedFaceIsOnTheLeftMessage	string	"Mova o celular para a direita"
detectedFaceIsOnTheRightMessage	string	"Mova o celular para a esquerda"
detectedFaceIsTooUpMessage	string	"Mova o celular para baixo"
detectedFaceIsTooDownMessage	string	"Mova o celular para cima"

FaceStyles

Variable name	Type	Default value
faceShape	FaceScreenShape	FaceScreenShape.CUSTOM
faceColor	string	"#FFFFFF"
faceEnabledColor	string	"#16AC81"
faceDisabledColor	string	"#E25353"
overlayColor	string	"#CC000000"
backButtonIcon	string	null
backButtonColor	string	"#FFFFFF"
backButtonSize	FaceSize	FaceSize(24, 24)
flashButtonIcon	string	null
flashButtonSize	FaceSize	FaceSize(24, 24)
flashButtonEnabledColor	string	"#FFCC01"
flashButtonDisabledColor	string	"#FFFFFF"
flipCameraButtonIcon	string	null
flipCameraButtonColor	string	"#FFFFFF"
flipCameraButtonSize	FaceSize	FaceSize(65, 43)
textColor	string	"#FFFFFF"
textSize	number	20
customFont	string	null
captureButtonIcon	string	null
captureButtonColor	string	"#D9D9D9"
captureButtonSize	FaceSize	FaceSize(76, 76)
customCaptureButtonBackgroundColor	string	"#D6A262"
customCaptureButtonSize	FaceSize	FaceSize(300, 45)
customCaptureButtonTextColor	string	"#FFFFFF"
customCaptureButtonTextSize	number	20

Changing Font Family

Android

You can use the default font family or set a font you prefer. To set a font, create a folder font under res directory in your android/app/src/main/res. Download the font which ever you want and paste it inside font folder. All font names must be only: lowercase a-z, 0-9, or underscore. The structure should be some thing like below.

Then, just set the font passing the name of the font file.

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
  .setStylesFontFamily("roboto_mono_bold_italic");

IOS

To add the font files to your Xcode project:

1. In Xcode, select the Project navigator.
2. Drag your fonts from a Finder window into your project. This copies the fonts to your project.
3. Select the font or folder with the fonts, and verify that the files show their target membership checked for your app’s targets.

Then, add the UIAppFonts key to your app’s Info.plist file. For the key’s value, provide an array of strings containing the relative paths to any added font files.

In the following example, the font file is inside the fonts directory, so you use fonts/RobotoMono-BoldItalic.ttf as the string value in the Info.plist file.

Finally, just set the font by passing the font name when instantiating FaceConfig.

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
    .setStylesCustomFont("RobotoMono-BoldItalic")

Changing Icon

Android

You can use the default icon or set a icon you prefer. To set a icon, download the icon which ever you want and paste it inside drawable folder in your android/app/src/main/res. The structure should be some thing like below.

Then, just set the font passing the name of the icon file.

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
  // changing back button icon
  .setStylesBackButtonIcon("ic_baseline_camera")
  // changing flash button icon
  .setStylesFlashButtonIcon("ic_baseline_camera")
  // changing flip camera button icon
  .setStylesFlipCameraButtonIcon("ic_baseline_camera")
  // changing capture button icon
  .setStylesCaptureButtonIcon("ic_baseline_camera");

IOS

To add icon files to your Xcode project:

1. In the Project navigator, select an asset catalog: a file with a .xcassets file extension.
2. Drag an image from the Finder to the outline view. A new image set appears in the outline view, and the image asset appears in a well in the detail area.

Finally, just set the icon by passing the icon name when instantiating FaceConfig.

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
    // changing back button icon
    .setStylesBackButtonIcon("photo_camera")
    // changing flash button icon
    .setStylesFlashButtonIcon("photo_camera")
    // changing flip camera button icon
    .setStylesFlipCameraButtonIcon("photo_camera")
    // changing capture button icon
    .setStylesCaptureButtonIcon("photo_camera")

FaceSize

Variable name	Type
width	number
height	number

FaceCameraPreset (enum)

Preset Type	Resolution
FaceCameraPreset.FACE_CAPTURE	640x480
FaceCameraPreset.CONTINUOUS_CAPTURE	640x480

FaceCameraLensDirection (enum)

Name
FaceCameraLensDirection.FRONT
FaceCameraLensDirection.BACK

FaceCaptureFormat (enum)

Name
FaceCaptureFormat.JPEG
FaceCaptureFormat.PNG

FaceCaptureButtonType (enum)

Name
FaceCaptureButtonType.CUSTOM
FaceCaptureButtonType.ICON

FaceScreenShape (enum)

Name
FaceScreenShape.SQUARE
FaceScreenShape.ELLIPSE
FaceScreenShape.CUSTOM

Using Custom Capture Button

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
  .setCaptureButtonType(FaceCaptureButtonType.CUSTOM)
  .setStylesCustomButtonBackgroundColor("#FFFF00")
  .setStylesCustomButtonTextColor("#FF00FF")
  .setStringsCustomButtonText("Capture");

Using Icon Capture Button

const config = FaceConfigPreset.getConfig(FaceConfigType.FACE_CAPTURE)
    .setCaptureButtonType(FaceCaptureButtonType.ICON)
    .setStylesCaptureButtonIcon("ic_baseline_camera")
    .setStylesCaptureButtonColor("#FF0000")
    .setStylesCaptureButtonSize({width: 76, height: 76});

How to instantiate and functionalities

To instantiate it's easy as to do one function call (as we have seen previously on the example). You only need to specify which type of config you want using a ENUM FaceConfigType. Every type however can have different features implemented, here are the supported types:

Config Type	Enum	feature
Face Capture	FaceConfigType.FACE_CAPTURE	Capture still image and detects face
Continuous Capture	FaceConfigType.CONTINUOUS_CAPTURE	Capture every frame per second

FaceEvent

On your Face callback function, you receive a FaceEvent.

FaceEvent

Name	Type
photo	Uint8Array

Changelog

v0.1.24

• Bug fixes.

v0.1.23

• Documentation update;
• New config option autoCaptureTimeout;
• UI customization improvements:
  • Added FaceScreenShape with more face shape options;
  • Added progress animation during face detection.

v0.1.22

• Bug fixes;
• Documentation update.

v0.1.21

• Bug fixes.

v0.1.20

• New licensing feature.

v0.1.19

• Bug fix.

v0.1.18

• Bug fixes;
• Flash mode fixes;
• Face detection improvement;
• New feature automatic capture;
• UI customization improvements;
• New feature face detection;
• Camera preset fix;
• Camera preview fix;
• New icon capture button;
• Fix in requesting permissions;
• Fix in performance of ContinuousCapture;
• Parameterizable screenTitle;
• New option to set text color;
• New custom capture button;
• Class name standardization;
• New option to set the font.

v0.1.13

• Face Capture SDK for Android and iOS.

License

This project is proprietary software. See the LICENSE for more information.