lemon-core
Version:
Lemon Serverless Micro-Service Platform
94 lines • 2.55 kB
JavaScript
;
/**
* file: `dynamodb-value.ts`
* - originally inspired via https://github.com/ironSource/node-dynamodb-value
* - refactoring for typescript error.
*
*
* @author Steve Jung <steve@lemoncloud.io>
* @date 2019-11-20 initial version via backbone
*
* @copyright (C) 2019 LemonCloud Co Ltd. - All Rights Reserved.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.toDDB = exports.toJavascript = void 0;
/**
* converts a ddb object into a js object
*
*/
function toJavascript(data, mergeInto = null) {
const result = mergeInto || {};
const keys = Object.keys(data);
for (let i = 0; i < keys.length; i++) {
const p = keys[i];
result[p] = toJsValue(data[p]);
}
return result;
}
exports.toJavascript = toJavascript;
/**
* converts a js object into a ddb object
*
*/
function toDDB(data, mergeInto = null) {
const result = mergeInto || {};
const keys = Object.keys(data);
for (let i = 0; i < keys.length; i++) {
const p = keys[i];
result[p] = toDDBValue(data[p]);
}
return result;
}
exports.toDDB = toDDB;
function toJsValue(entry) {
const types = Object.keys(entry);
// TODO maybe it would be better to create a property with undefined value for this ?
if (types.length === 0)
throw new Error('missing type for ' + entry);
const type = types[0];
const val = entry[type];
if (type === 'NULL' && val === true) {
return null;
}
if (type === 'N') {
return Number(val);
}
if (type === 'M') {
return toJavascript(val);
}
if (type === 'L') {
return toJsArray(val);
}
return val;
}
function toJsArray(arr) {
const val = new Array(arr.length);
for (let x = 0; x < arr.length; x++) {
val[x] = toJsValue(arr[x]);
}
return val;
}
function toDDBValue(val) {
if (typeof val === 'string') {
return { S: val };
}
if (typeof val === 'number') {
return { N: val.toString() };
}
if (typeof val === 'boolean') {
return { BOOL: val };
}
if (typeof val === 'object' && Array.isArray(val)) {
const result = new Array(val.length);
for (let i = 0; i < result.length; i++) {
result[i] = toDDBValue(val[i]);
}
return { L: result };
}
// TODO add checks for regexp, date and others
// then throw if needed
if (typeof val === 'object') {
return { M: toDDB(val) };
}
}
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