@trezor/transport/lib/utils/bridgeProtocolMessage.js

Low level library facilitating protocol buffers based communication with Trezor devices

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.validateProtocolMessage = validateProtocolMessage;
exports.createProtocolMessage = createProtocolMessage;
function validateProtocolMessage(body, withData = true) {
  const isHex = s => /^[0-9A-Fa-f]+$/g.test(s);
  const isValidProtocol = s => s === 'v1' || s === 'v2' || s === 'bridge';
  if (typeof body === 'string') {
    if (withData && isHex(body) || !withData && !body.length) {
      return {
        data: body
      };
    }
  }
  let json;
  if (typeof body === 'object') {
    json = body;
  } else {
    try {
      json = JSON.parse(body);
    } catch {}
  }
  if (!json) {
    throw new Error('Invalid BridgeProtocolMessage body');
  }
  if (typeof json.protocol !== 'string' || !isValidProtocol(json.protocol)) {
    throw new Error('Invalid BridgeProtocolMessage protocol');
  }
  if (withData && (typeof json.data !== 'string' || !isHex(json.data))) {
    throw new Error('Invalid BridgeProtocolMessage data');
  }
  return {
    protocol: json.protocol,
    data: json.data,
    thpState: json.thpState
  };
}
function createProtocolMessage(body, protocol, thpState) {
  let data;
  if (Buffer.isBuffer(body)) {
    data = body.toString('hex');
  }
  if (typeof body === 'string') {
    data = body;
  }
  if (typeof data !== 'string') {
    data = '';
  }
  if (!protocol) {
    return data;
  }
  return JSON.stringify({
    protocol: typeof protocol === 'string' ? protocol : protocol.name,
    data,
    thpState
  });
}
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