rename index.js to coretool.js
This commit is contained in:
Luk Lu
193
coretool.js
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193
coretool.js
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/* 基础小工具，可通用于服务端和用户端
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*/
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module.exports = {
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sleep: (ms) => new Promise((resolve, reject) => setTimeout(resolve, ms)),
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parseJsonPossible(value) {
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try {
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return JSON.parse(value)
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} catch (e) {
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return value
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}
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},
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// 按顺序展开，哪怕嵌套。
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stringifyOrdered (obj, {cmp, cycles = false, space = '', replacer, schemaColumns, excludeKeys = []} = {}) {
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/* 这个解决方法不考虑缺省值，不能把嵌套对象也按顺序展开。*/
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// return JSON.stringify(obj, Object.keys(schemaColumns || entity).sort().filter(key => ! excludeKeys.includes(key))) // JSON.stringify 可根据第二个数组参数的顺序排序
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let newObj = {}
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if (schemaColumns) {
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for (let key in schemaColumns){
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if (schemaColumns.hasOwnProperty(key) && ! schemaColumns[key].hashExclusive && ! excludeKeys.includes(key)) {
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// JSON.stringify (包括本函数）会把 NaN 或 Infinity 输出为 null，会把 undefined 忽略掉。
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// 而在typeorm sqlite数据库中，undefined 会自动存为 schemaColumns[key].default 或 null。从数据库读出时，就会和事先JSON.stringify的结果不一致。
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// 为了和数据库保持一致习惯，对schemaColumns里的键值最好把 undefined 也设为 default 或 null。
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if (obj[key] === undefined || Number.isNaN(obj[key]) || obj[key] === Infinity) {
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newObj[key] = schemaColumns[key].default || null
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obj[key] = schemaColumns[key].default || null // 确保内存中的数据和数据库保持一致
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}else {
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newObj[key] = obj[key]
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}
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}
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}
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}else{
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newObj = obj
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}
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/* 以下代码来自 https://github.com/substack/json-stable-stringify 可把嵌套的复杂值也按顺序输出，例如 { c: 8, b: [{z:6,y:5,x:4},7], a: 3 } */
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if (typeof space === 'number') space = Array(space+1).join(' ')
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var cycles = (typeof cycles === 'boolean') ? cycles : false
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var replacer = replacer || function(key, value) { return value }
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var cmp = cmp && (function (f) {
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return function (node) {
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return function (a, b) {
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var aobj = { key: a, value: node[a] }
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var bobj = { key: b, value: node[b] }
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return f(aobj, bobj)
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}
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}
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})(cmp)
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var seen = []
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return (function stringify (parent, key, node, level) {
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var indent = space ? ('\n' + new Array(level + 1).join(space)) : ''
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var colonSeparator = space ? ': ' : ':'
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if (node && node.toJSON && typeof node.toJSON === 'function') {
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node = node.toJSON()
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}
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node = replacer.call(parent, key, node)
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if (node === undefined) {
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return
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}
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if (typeof node !== 'object' || node === null) {
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return JSON.stringify(node)
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}
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if (Array.isArray(node)) {
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var out = []
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for (var i = 0; i < node.length; i++) {
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var item = stringify(node, i, node[i], level+1) || JSON.stringify(null)
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out.push(indent + space + item)
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}
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return '[' + out.join(',') + indent + ']'
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}
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else {
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if (seen.indexOf(node) !== -1) {
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if (cycles) return JSON.stringify('__cycle__')
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throw new TypeError('Converting circular structure to JSON')
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}
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else seen.push(node)
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var keys = Object.keys(node).sort(cmp && cmp(node))
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var out = []
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i]
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var value = stringify(node, key, node[key], level+1)
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if(!value) continue
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var keyValue = JSON.stringify(key)
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+ colonSeparator
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+ value
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out.push(indent + space + keyValue)
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}
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seen.splice(seen.indexOf(node), 1)
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return '{' + out.join(',') + indent + '}'
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}
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})({ '': newObj }, '', newObj, 0)
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},
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name2port(name='') {
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let port = name.toLowerCase()
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.replace(/[abc]/g, 2)
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.replace(/[def]/g, 3)
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.replace(/[ghi]/g, 4)
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.replace(/[jkl]/g, 5)
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.replace(/[mno]/g, 6)
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.replace(/[pqrs]/g, 7)
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.replace(/[tuv]/g, 8)
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.replace(/[wxyz]/g, 9)
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return parseInt(port)
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},
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randomNumber ({ length, min, max } = {}) {
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// 长度为 length 的随机数字，或者 (min||0) <= num < max
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var num = 0
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if (typeof length === 'number' && length > 0) {
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num = parseInt(Math.random() * Math.pow(10, length))
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num = num.toString().padStart(length, '0')
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} else if (typeof max === 'number' && max > 0) {
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min = typeof min === 'number' && min >= 0 ? min : 0
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num = parseInt(Math.random() * (max - min)) + min
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} else {
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// 如果 option 为空
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num = Math.random()
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}
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return num
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},
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hash (data, { hasher = 'sha256', salt, input = 'utf8', output = 'hex' } = {}) {
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if (typeof data !== 'string' && !(data instanceof Buffer) && !(data instanceof DataView)) data = JSON.stringify(data)
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if (salt && typeof salt === 'string') data = data + salt
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const inputEncoding = input // my.INPUT_LIST.indexOf(option.input)>=0?option.input:my.INPUT // 'utf8', 'ascii' or 'latin1' for string data, default to utf8 if not specified; ignored for Buffer, TypedArray, or DataView.
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const outputEncoding = output === 'buf' ? undefined : output // (my.OUTPUT_LIST.indexOf(output)>=0?output:my.OUTPUT) // option.output: 留空=》默认输出hex格式；或者手动指定 'buf', hex', 'latin1' or 'base64'
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return require('crypto').createHash(hasher).update(data, inputEncoding).digest(outputEncoding)
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},
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/**
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* 用户编号转邀请码
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*
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* @static
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* @param {*} aiid
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* @return {*}
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* @memberof TICrypto
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*/
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aiid2regcode (aiid) {
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const alphabet = 'e5fcdg3hqa4b1n0pij2rstuv67mwx89klyz'
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const base = 16367
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let num = (aiid + base) * (base - alphabet.length)
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let code = ''
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let mod
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while (num > 0) {
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mod = num % alphabet.length
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num = (num - mod) / alphabet.length
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code = code + alphabet[mod] // 倒序存放
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}
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return code
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},
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/**
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* 邀请码转用户编号
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*
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* @static
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* @param {*} code
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* @return {*}
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* @memberof TICrypto
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*/
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regcode2aiid (code) {
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if (typeof code === 'string' && /^[a-zA-Z0-9]+$/.test(code)) {
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const alphabet = 'e5fcdg3hqa4b1n0pij2rstuv67mwx89klyz'
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const base = 16367
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code = code.toLowerCase()
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let len = code.length
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let num = 0
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for (let i = 0; i < len; i++) {
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num += alphabet.indexOf(code[i]) * Math.pow(alphabet.length, i)
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}
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let aiid = num / (base - alphabet.length) - base
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if (aiid >= 0 && Number.isInteger(aiid)) {
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// 允许 aiid===0：当第一个用户（aiid==1）登录时，需要一个系统默认的邀请码。
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return aiid
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}
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}
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return null // null 代表一切非法的regcode
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},
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}
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