web3-provider-engine/dist/es5/subproviders/sanitizer.js

A JavaScript library for composing Ethereum provider objects using middleware modules

"use strict";

function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
/* Sanitization Subprovider
 * For Parity compatibility
 * removes irregular keys
 */

var inherits = require('util').inherits;
var Subprovider = require('./subprovider.js');
var extend = require('xtend');
var ethUtil = require('@ethereumjs/util');
module.exports = SanitizerSubprovider;
inherits(SanitizerSubprovider, Subprovider);
function SanitizerSubprovider(opts) {
  var self = this;
}
SanitizerSubprovider.prototype.handleRequest = function (payload, next, end) {
  var txParams = payload.params[0];
  if (_typeof(txParams) === 'object' && !Array.isArray(txParams)) {
    var sanitized = cloneTxParams(txParams);
    payload.params[0] = sanitized;
  }
  next();
};

// we use this to clean any custom params from the txParams
var permitted = ['from', 'to', 'value', 'data', 'gas', 'gasPrice', 'nonce', 'fromBlock', 'toBlock', 'address', 'topics'];
function cloneTxParams(txParams) {
  var sanitized = permitted.reduce(function (copy, permitted) {
    if (permitted in txParams) {
      if (Array.isArray(txParams[permitted])) {
        copy[permitted] = txParams[permitted].map(function (item) {
          return sanitize(item);
        });
      } else {
        copy[permitted] = sanitize(txParams[permitted]);
      }
    }
    return copy;
  }, {});
  return sanitized;
}
function sanitize(value) {
  switch (value) {
    case 'latest':
      return value;
    case 'pending':
      return value;
    case 'earliest':
      return value;
    default:
      if (typeof value === 'string') {
        return ethUtil.addHexPrefix(value.toLowerCase());
      } else {
        return value;
      }
  }
}