@chainsafe/eth2.0-utils/lib/converters/json.js

Utilities required across multiple lodestar packages

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.toJson = toJson;
exports.fromJson = fromJson;

var _bn = _interopRequireDefault(require("bn.js"));

var _snakeCase = _interopRequireDefault(require("snake-case"));

var _bytes = require("../bytes");

var _sszTypeSchema = require("@chainsafe/ssz-type-schema");

var _bitUtils = require("@chainsafe/bit-utils");

var _misc = require("../misc");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

function toJson(o) {
  o = _objectSpread({}, o);

  for (const key in o) {
    const newKey = (0, _snakeCase.default)(key); //@ts-ignore

    o[newKey] = o[key] !== null ? serializeToJson(o[key]) : null;

    if (newKey !== key) {
      //@ts-ignore
      delete o[key];
    }
  }

  return o;
}

function serializeToJson(value) {
  if (Buffer.isBuffer(value)) {
    return (0, _bytes.toHex)(value);
  }

  if (typeof value === "bigint") {
    return value.toString();
  }

  if (_bitUtils.BitVector.isBitVector(value)) {
    return Buffer.from(value.toBitfield()).toString("hex");
  }

  if (_bitUtils.BitList.isBitList(value)) {
    return Buffer.from(value.serialize()).toString("hex");
  }

  if (Array.isArray(value)) {
    return value.map(toJson);
  }

  if (typeof value === "object") {
    return toJson(value);
  }

  return value;
}

function fromJson(type, value) {
  value = (0, _misc.objectToCamelCase)(_objectSpread({}, value));
  return expandJsonValue((0, _sszTypeSchema.parseType)(type), value);
}

function expandJsonValue(type, value) {
  switch (type.type) {
    case _sszTypeSchema.Type.uint:
      if (type.use === "bn") {
        return new _bn.default(value);
      } else if (type.byteLength <= 6 || type.use === "number") {
        const n = Number(value);
        return Number.isSafeInteger(n) ? n : Infinity;
      } else {
        return BigInt(value);
      }

    case _sszTypeSchema.Type.bool:
      return value;

    case _sszTypeSchema.Type.bitList:
      return _bitUtils.BitList.deserialize(Buffer.from(value.slice(2), "hex"));

    case _sszTypeSchema.Type.bitVector:
      return _bitUtils.BitVector.fromBitfield(Buffer.from(value.slice(2), "hex"), type.length);

    case _sszTypeSchema.Type.byteList:
    case _sszTypeSchema.Type.byteVector:
      return Buffer.from(value.slice(2), "hex");

    case _sszTypeSchema.Type.list:
    case _sszTypeSchema.Type.vector:
      return value.map(element => expandJsonValue(type.elementType, element));

    case _sszTypeSchema.Type.container:
      type.fields.forEach(([fieldName, fieldType]) => {
        value[fieldName] = expandJsonValue((0, _sszTypeSchema.parseType)(fieldType), value[fieldName]);
      });
      return value;
  }
}
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