index.js

import { NativeModules } from "react-native";

const { U2f } = NativeModules;

const errorNames = {
  "1": "OTHER_ERROR",
  "2": "BAD_REQUEST",
  "3": "CONFIGURATION_UNSUPPORTED",
  "4": "DEVICE_INELIGIBLE",
  "5": "TIMEOUT"
};

const ReactNativeU2fApi = {
  register: function(registerRequests, registeredKeys, timeout = 60) {
    return new Promise((resolve, reject) => {
      if (!Array.isArray(registerRequests) || !Array.isArray(registeredKeys)) {
        reject(
          new Error("registerRequests and registeredKeys need to be an arrays.")
        );
        return;
      }
      U2f.nativeRegister(registerRequests, registeredKeys, timeout)
        .then(resultString => {
          const result = JSON.parse(resultString);
          if ("errorCode" in result) {
            const msg =
              "errorMessage" in result
                ? result.errorMessage
                : "Security Key responded with errorCode";
            const error = new Error(msg);
            error.metaData = {
              type: errorNames[result.errorCode],
              code: result.errorCode
            };
            reject(error);
          } else {
            resolve(resultString);
          }
        })
        .catch(e => {
          const error = new Error(e.message);
          error.metaData = {
            type: "NATIVE_ERROR",
            code: 0
          };
          reject(error);
        });
    });
  },
  sign: function(registeredKeys, timeout = 60) {
    return new Promise((resolve, reject) => {
      if (!Array.isArray(registeredKeys)) {
        reject(new Error("registeredKeys need to be an array."));
        return;
      }
      U2f.nativeSign(registeredKeys, timeout)
        .then(resultString => {
          const result = JSON.parse(resultString);
          if ("errorCode" in result) {
            const msg =
              "errorMessage" in result
                ? result.errorMessage
                : "Security Key responded with errorCode";
            const error = new Error(msg);
            error.metaData = {
              type: errorNames[result.errorCode],
              code: result.errorCode
            };
            reject(error);
          } else {
            resolve(resultString);
          }
        })
        .catch(e => {
          const error = new Error(e.message);
          error.metaData = {
            type: "NATIVE_ERROR",
            code: 0
          };
          reject(error);
        });
    });
  }
};

export default ReactNativeU2fApi;