React Native bridge for AndyQ/NFCPassportReader

RNNFCPassportReader.m

//
//  NFCPassportReader.m
//  StashawayApp
//
//  Created by Sam Aryasa on 3/6/20.
//  Copyright © 2020 Facebook. All rights reserved.
//

#import "React/RCTBridgeModule.h"

@interface RCT_EXTERN_MODULE(RNNFCPassportReader, NSObject)

RCT_EXTERN_METHOD(
                  readPassport: (NSString *)mrzKey
                  customMessages: (NSDictionary *)customMessages
                  resolver: (RCTPromiseResolveBlock)resolve
                  rejecter: (RCTPromiseRejectBlock)reject)

@end

RNNFCPassportReader.swift

//
//  NFCPassportReader.swift
//  StashawayApp
//
//  Created by Sam Aryasa on 3/6/20.
//  Copyright © 2020 Facebook. All rights reserved.
//

import Foundation

import CoreNFC
import NFCPassportReader


@objc(RNNFCPassportReader)
class RNNFCPassportReader: NSObject {
  private var passportReader: Any;
  
  override init() {
    guard #available(iOS 13, *) else {
      passportReader = NSNull()
      return;
    }
    
    passportReader = PassportReader()
  }
  
  @objc
  static func requiresMainQueueSetup() -> Bool {
    return true
  }
  
  @objc
  func constantsToExport() -> [AnyHashable : Any]! {
    guard #available(iOS 13, *) else {
      return ["isSupported": false]
    }

    if NSClassFromString("NFCNDEFReaderSession") == nil {
      return ["isSupported": false]
    }
    
    return ["isSupported": NFCNDEFReaderSession.readingAvailable]
  }
  
  func handleProgress(percentualProgress: Int) -> String {
      let p = (percentualProgress/20)
      let full = String(repeating: "🟢 ", count: p)
      let empty = String(repeating: "⚪️ ", count: 6 - p)
      return "\(full)\(empty)"
  }
  
  @objc
  func readPassport(
    _ mrzKey: NSString,
    customMessages: NSDictionary,
    resolver resolve: @escaping RCTPromiseResolveBlock,
    rejecter reject: @escaping RCTPromiseRejectBlock
  ) -> Void {
    guard #available(iOS 13, *) else {
      reject("READ_PASSWORD_ERROR", "NFC_NOT_SUPPORTED", nil)
      return
    }

    
    (passportReader as! PassportReader).readPassport(
      mrzKey: mrzKey as String,
      tags: [.COM, .DG1, .DG2],
      customDisplayMessage: { (displayMessage) in
        switch displayMessage {
          case .requestPresentPassport:
            let message = customMessages["requestPresentPassport"] as? String ?? "Hold your iPhone near an NFC enabled passport.";
            return message
          case .authenticatingWithPassport(let progress):
            let message = customMessages["authenticatingWithPassport"] as? String ?? "Authenticating with passport.....";
            let progressString = self.handleProgress(percentualProgress: progress)
            return "\(message)\n\n\(progressString)"
          case .readingDataGroupProgress(let dataGroup, let progress):
            let message = customMessages["readingDataGroupProgress"] as? String ?? "Reading \(dataGroup).....";
            let progressString = self.handleProgress(percentualProgress: progress)
            return "\(message)\n\n\(progressString)"
          case .error(let tagError):
            let message = customMessages["error"] as? String ?? "Failed to read Passport NFC";
            let errorKey = tagError.errorDescription ?? "UnknownError"
            return "\(message) (\(errorKey))"
          case .successfulRead:
            let message = customMessages["successfulRead"] as? String ?? "Passport read successfully";
            return message
        }
      },
      completed: { (passport, error) in
        if let passport = passport,
          let photo = passport.passportImage,
          let photoData = photo.pngData() {
          
          let photoBase64 = "data:image/png;base64," + photoData.base64EncodedString()
          
          let result: NSDictionary = [
            "firstName" : passport.firstName,
            "lastName" : passport.lastName,
            "gender" : passport.gender,
            "issuer" : passport.issuingAuthority,
            "nationality" : passport.nationality,
            "photo" : [
              "base64": photoBase64,
              "width": photo.size.width * photo.scale,
              "height": photo.size.height * photo.scale,
            ],
          ]
          
          resolve(result)
        } else {
          reject("READ_PASSWORD_ERROR", error?.localizedDescription, error)
        }
     })
  }
}