269 lines
8.4 KiB
JavaScript
269 lines
8.4 KiB
JavaScript
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/*
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Copyright (c) 2014, Yahoo! Inc. All rights reserved.
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Copyrights licensed under the New BSD License.
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See the accompanying LICENSE file for terms.
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*/
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'use strict';
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var randomBytes = require('randombytes');
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// Generate an internal UID to make the regexp pattern harder to guess.
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var UID_LENGTH = 16;
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var UID = generateUID();
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var PLACE_HOLDER_REGEXP = new RegExp('(\\\\)?"@__(F|R|D|M|S|A|U|I|B|L)-' + UID + '-(\\d+)__@"', 'g');
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var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
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var IS_PURE_FUNCTION = /function.*?\(/;
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var IS_ARROW_FUNCTION = /.*?=>.*?/;
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var UNSAFE_CHARS_REGEXP = /[<>\/\u2028\u2029]/g;
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var RESERVED_SYMBOLS = ['*', 'async'];
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// Mapping of unsafe HTML and invalid JavaScript line terminator chars to their
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// Unicode char counterparts which are safe to use in JavaScript strings.
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var ESCAPED_CHARS = {
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'<' : '\\u003C',
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'>' : '\\u003E',
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'/' : '\\u002F',
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'\u2028': '\\u2028',
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'\u2029': '\\u2029'
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};
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function escapeUnsafeChars(unsafeChar) {
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return ESCAPED_CHARS[unsafeChar];
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}
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function generateUID() {
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var bytes = randomBytes(UID_LENGTH);
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var result = '';
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for(var i=0; i<UID_LENGTH; ++i) {
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result += bytes[i].toString(16);
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}
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return result;
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}
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function deleteFunctions(obj){
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var functionKeys = [];
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for (var key in obj) {
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if (typeof obj[key] === "function") {
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functionKeys.push(key);
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}
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}
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for (var i = 0; i < functionKeys.length; i++) {
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delete obj[functionKeys[i]];
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}
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}
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module.exports = function serialize(obj, options) {
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options || (options = {});
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// Backwards-compatibility for `space` as the second argument.
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if (typeof options === 'number' || typeof options === 'string') {
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options = {space: options};
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}
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var functions = [];
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var regexps = [];
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var dates = [];
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var maps = [];
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var sets = [];
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var arrays = [];
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var undefs = [];
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var infinities= [];
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var bigInts = [];
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var urls = [];
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// Returns placeholders for functions and regexps (identified by index)
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// which are later replaced by their string representation.
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function replacer(key, value) {
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// For nested function
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if(options.ignoreFunction){
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deleteFunctions(value);
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}
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if (!value && value !== undefined) {
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return value;
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}
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// If the value is an object w/ a toJSON method, toJSON is called before
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// the replacer runs, so we use this[key] to get the non-toJSONed value.
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var origValue = this[key];
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var type = typeof origValue;
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if (type === 'object') {
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if(origValue instanceof RegExp) {
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return '@__R-' + UID + '-' + (regexps.push(origValue) - 1) + '__@';
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}
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if(origValue instanceof Date) {
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return '@__D-' + UID + '-' + (dates.push(origValue) - 1) + '__@';
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}
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if(origValue instanceof Map) {
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return '@__M-' + UID + '-' + (maps.push(origValue) - 1) + '__@';
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}
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if(origValue instanceof Set) {
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return '@__S-' + UID + '-' + (sets.push(origValue) - 1) + '__@';
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}
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if(origValue instanceof Array) {
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var isSparse = origValue.filter(function(){return true}).length !== origValue.length;
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if (isSparse) {
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return '@__A-' + UID + '-' + (arrays.push(origValue) - 1) + '__@';
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}
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}
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if(origValue instanceof URL) {
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return '@__L-' + UID + '-' + (urls.push(origValue) - 1) + '__@';
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}
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}
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if (type === 'function') {
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return '@__F-' + UID + '-' + (functions.push(origValue) - 1) + '__@';
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}
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if (type === 'undefined') {
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return '@__U-' + UID + '-' + (undefs.push(origValue) - 1) + '__@';
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}
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if (type === 'number' && !isNaN(origValue) && !isFinite(origValue)) {
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return '@__I-' + UID + '-' + (infinities.push(origValue) - 1) + '__@';
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}
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if (type === 'bigint') {
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return '@__B-' + UID + '-' + (bigInts.push(origValue) - 1) + '__@';
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}
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return value;
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}
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function serializeFunc(fn) {
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var serializedFn = fn.toString();
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if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
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throw new TypeError('Serializing native function: ' + fn.name);
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}
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// pure functions, example: {key: function() {}}
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if(IS_PURE_FUNCTION.test(serializedFn)) {
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return serializedFn;
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}
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// arrow functions, example: arg1 => arg1+5
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if(IS_ARROW_FUNCTION.test(serializedFn)) {
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return serializedFn;
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}
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var argsStartsAt = serializedFn.indexOf('(');
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var def = serializedFn.substr(0, argsStartsAt)
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.trim()
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.split(' ')
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.filter(function(val) { return val.length > 0 });
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var nonReservedSymbols = def.filter(function(val) {
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return RESERVED_SYMBOLS.indexOf(val) === -1
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});
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// enhanced literal objects, example: {key() {}}
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if(nonReservedSymbols.length > 0) {
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return (def.indexOf('async') > -1 ? 'async ' : '') + 'function'
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+ (def.join('').indexOf('*') > -1 ? '*' : '')
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+ serializedFn.substr(argsStartsAt);
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}
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// arrow functions
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return serializedFn;
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}
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// Check if the parameter is function
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if (options.ignoreFunction && typeof obj === "function") {
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obj = undefined;
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}
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// Protects against `JSON.stringify()` returning `undefined`, by serializing
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// to the literal string: "undefined".
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if (obj === undefined) {
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return String(obj);
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}
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var str;
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// Creates a JSON string representation of the value.
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// NOTE: Node 0.12 goes into slow mode with extra JSON.stringify() args.
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if (options.isJSON && !options.space) {
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str = JSON.stringify(obj);
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} else {
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str = JSON.stringify(obj, options.isJSON ? null : replacer, options.space);
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}
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// Protects against `JSON.stringify()` returning `undefined`, by serializing
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// to the literal string: "undefined".
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if (typeof str !== 'string') {
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return String(str);
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}
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// Replace unsafe HTML and invalid JavaScript line terminator chars with
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// their safe Unicode char counterpart. This _must_ happen before the
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// regexps and functions are serialized and added back to the string.
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if (options.unsafe !== true) {
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str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
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}
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if (functions.length === 0 && regexps.length === 0 && dates.length === 0 && maps.length === 0 && sets.length === 0 && arrays.length === 0 && undefs.length === 0 && infinities.length === 0 && bigInts.length === 0 && urls.length === 0) {
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return str;
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}
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// Replaces all occurrences of function, regexp, date, map and set placeholders in the
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// JSON string with their string representations. If the original value can
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// not be found, then `undefined` is used.
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return str.replace(PLACE_HOLDER_REGEXP, function (match, backSlash, type, valueIndex) {
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// The placeholder may not be preceded by a backslash. This is to prevent
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// replacing things like `"a\"@__R-<UID>-0__@"` and thus outputting
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// invalid JS.
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if (backSlash) {
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return match;
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}
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if (type === 'D') {
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return "new Date(\"" + dates[valueIndex].toISOString() + "\")";
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}
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if (type === 'R') {
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return "new RegExp(" + serialize(regexps[valueIndex].source) + ", \"" + regexps[valueIndex].flags + "\")";
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}
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if (type === 'M') {
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return "new Map(" + serialize(Array.from(maps[valueIndex].entries()), options) + ")";
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}
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if (type === 'S') {
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return "new Set(" + serialize(Array.from(sets[valueIndex].values()), options) + ")";
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}
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if (type === 'A') {
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return "Array.prototype.slice.call(" + serialize(Object.assign({ length: arrays[valueIndex].length }, arrays[valueIndex]), options) + ")";
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}
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if (type === 'U') {
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return 'undefined'
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}
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if (type === 'I') {
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return infinities[valueIndex];
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}
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if (type === 'B') {
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return "BigInt(\"" + bigInts[valueIndex] + "\")";
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}
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if (type === 'L') {
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return "new URL(\"" + urls[valueIndex].toString() + "\")";
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}
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var fn = functions[valueIndex];
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return serializeFunc(fn);
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});
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}
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