authService.ts

import KJUR from "jsrsasign"

import Config from "./config"

import DeviceInfo from 'react-native-device-info';


/**
 * AuthService class
 */
class AuthService {

    // Just use the deviceId for the subject claim.
    static getCurrentUsername(){
        return DeviceInfo.getUniqueId();
    }

    static authChallenge(options, answerAuthenticationChallenge) {
        // Header
        var oHeader = { alg: 'HS256', typ: 'JWT' };
        // Payload
        var tNow = KJUR.jws.IntDate.get('now');
        var tEnd = KJUR.jws.IntDate.get('now + 1day');
        var oPayload = {
            sub: this.getCurrentUsername(),
            nonce: options.nonce,
            iss: Config.issuer,
            aud: Config.audience,
            iat: tNow,
            exp: tEnd,
        };
        var sHeader = JSON.stringify(oHeader);
        var sPayload = JSON.stringify(oPayload);
        var sJWT = KJUR.jws.JWS.sign("HS256", sHeader, sPayload, {utf8: Config.secret});
        answerAuthenticationChallenge(sJWT);
    }

}

export default AuthService;