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113 lines
3.3 KiB
113 lines
3.3 KiB
'use strict'
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const hasBuffer = typeof Buffer !== 'undefined'
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const suspectProtoRx = /"(?:_|\\u005[Ff])(?:_|\\u005[Ff])(?:p|\\u0070)(?:r|\\u0072)(?:o|\\u006[Ff])(?:t|\\u0074)(?:o|\\u006[Ff])(?:_|\\u005[Ff])(?:_|\\u005[Ff])"\s*:/
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const suspectConstructorRx = /"(?:c|\\u0063)(?:o|\\u006[Ff])(?:n|\\u006[Ee])(?:s|\\u0073)(?:t|\\u0074)(?:r|\\u0072)(?:u|\\u0075)(?:c|\\u0063)(?:t|\\u0074)(?:o|\\u006[Ff])(?:r|\\u0072)"\s*:/
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function parse (text, reviver, options) {
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// Normalize arguments
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if (options == null) {
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if (reviver !== null && typeof reviver === 'object') {
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options = reviver
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reviver = undefined
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}
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}
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if (hasBuffer && Buffer.isBuffer(text)) {
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text = text.toString()
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}
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// BOM checker
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if (text && text.charCodeAt(0) === 0xFEFF) {
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text = text.slice(1)
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}
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// Parse normally, allowing exceptions
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const obj = JSON.parse(text, reviver)
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// Ignore null and non-objects
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if (obj === null || typeof obj !== 'object') {
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return obj
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}
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const protoAction = (options && options.protoAction) || 'error'
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const constructorAction = (options && options.constructorAction) || 'error'
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// options: 'error' (default) / 'remove' / 'ignore'
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if (protoAction === 'ignore' && constructorAction === 'ignore') {
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return obj
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}
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if (protoAction !== 'ignore' && constructorAction !== 'ignore') {
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if (suspectProtoRx.test(text) === false && suspectConstructorRx.test(text) === false) {
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return obj
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}
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} else if (protoAction !== 'ignore' && constructorAction === 'ignore') {
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if (suspectProtoRx.test(text) === false) {
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return obj
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}
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} else {
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if (suspectConstructorRx.test(text) === false) {
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return obj
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}
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}
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// Scan result for proto keys
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return filter(obj, { protoAction, constructorAction, safe: options && options.safe })
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}
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function filter (obj, { protoAction = 'error', constructorAction = 'error', safe } = {}) {
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let next = [obj]
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while (next.length) {
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const nodes = next
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next = []
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for (const node of nodes) {
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if (protoAction !== 'ignore' && Object.prototype.hasOwnProperty.call(node, '__proto__')) { // Avoid calling node.hasOwnProperty directly
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if (safe === true) {
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return null
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} else if (protoAction === 'error') {
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throw new SyntaxError('Object contains forbidden prototype property')
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}
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delete node.__proto__ // eslint-disable-line no-proto
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}
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if (constructorAction !== 'ignore' &&
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Object.prototype.hasOwnProperty.call(node, 'constructor') &&
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Object.prototype.hasOwnProperty.call(node.constructor, 'prototype')) { // Avoid calling node.hasOwnProperty directly
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if (safe === true) {
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return null
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} else if (constructorAction === 'error') {
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throw new SyntaxError('Object contains forbidden prototype property')
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}
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delete node.constructor
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}
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for (const key in node) {
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const value = node[key]
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if (value && typeof value === 'object') {
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next.push(value)
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}
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}
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}
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}
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return obj
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}
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function safeParse (text, reviver) {
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try {
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return parse(text, reviver, { safe: true })
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} catch (ignoreError) {
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return null
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}
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}
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module.exports = parse
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module.exports.default = parse
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module.exports.parse = parse
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module.exports.safeParse = safeParse
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module.exports.scan = filter
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