Marc Mintel
5397309103
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318 lines
9.9 KiB
Plaintext
318 lines
9.9 KiB
Plaintext
'use strict'
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import * as utils from './utils.js'
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const has = Object.prototype.hasOwnProperty
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const isArray = Array.isArray
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const defaults = {
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allowDots: false,
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allowEmptyArrays: false,
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allowPrototypes: false,
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allowSparse: false,
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arrayLimit: 20,
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charset: 'utf-8',
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charsetSentinel: false,
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comma: false,
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decodeDotInKeys: false,
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decoder: utils.decode,
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delimiter: '&',
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depth: 5,
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duplicates: 'combine',
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ignoreQueryPrefix: false,
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interpretNumericEntities: false,
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parameterLimit: 1000,
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parseArrays: true,
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plainObjects: false,
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strictNullHandling: false,
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}
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const interpretNumericEntities = function (str) {
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return str.replace(/&#(\d+);/g, function ($0, numberStr) {
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return String.fromCharCode(parseInt(numberStr, 10))
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})
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}
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const parseArrayValue = function (val, options) {
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if (val && typeof val === 'string' && options.comma && val.indexOf(',') > -1) {
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return val.split(',')
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}
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return val
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}
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// This is what browsers will submit when the ✓ character occurs in an
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// application/x-www-form-urlencoded body and the encoding of the page containing
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// the form is iso-8859-1, or when the submitted form has an accept-charset
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// attribute of iso-8859-1. Presumably also with other charsets that do not contain
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// the ✓ character, such as us-ascii.
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const isoSentinel = 'utf8=%26%2310003%3B' // encodeURIComponent('✓')
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// These are the percent-encoded utf-8 octets representing a checkmark, indicating that the request actually is utf-8 encoded.
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const charsetSentinel = 'utf8=%E2%9C%93' // encodeURIComponent('✓')
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const parseValues = function parseQueryStringValues(str, options) {
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const obj = { __proto__: null }
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const cleanStr = options.ignoreQueryPrefix ? str.replace(/^\?/, '') : str
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const limit = options.parameterLimit === Infinity ? undefined : options.parameterLimit
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const parts = cleanStr.split(options.delimiter, limit)
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let skipIndex = -1 // Keep track of where the utf8 sentinel was found
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let i
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let charset = options.charset
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if (options.charsetSentinel) {
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for (i = 0; i < parts.length; ++i) {
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if (parts[i].indexOf('utf8=') === 0) {
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if (parts[i] === charsetSentinel) {
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charset = 'utf-8'
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} else if (parts[i] === isoSentinel) {
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charset = 'iso-8859-1'
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}
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skipIndex = i
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i = parts.length // The eslint settings do not allow break;
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}
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}
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}
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for (i = 0; i < parts.length; ++i) {
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if (i === skipIndex) {
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continue
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}
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const part = parts[i]
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const bracketEqualsPos = part.indexOf(']=')
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const pos = bracketEqualsPos === -1 ? part.indexOf('=') : bracketEqualsPos + 1
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let key, val
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if (pos === -1) {
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key = options.decoder(part, defaults.decoder, charset, 'key')
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val = options.strictNullHandling ? null : ''
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} else {
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key = options.decoder(part.slice(0, pos), defaults.decoder, charset, 'key')
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val = utils.maybeMap(parseArrayValue(part.slice(pos + 1), options), function (encodedVal) {
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return options.decoder(encodedVal, defaults.decoder, charset, 'value')
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})
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}
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if (val && options.interpretNumericEntities && charset === 'iso-8859-1') {
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val = interpretNumericEntities(val)
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}
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if (part.indexOf('[]=') > -1) {
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val = isArray(val) ? [val] : val
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}
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const existing = has.call(obj, key)
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if (existing && options.duplicates === 'combine') {
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obj[key] = utils.combine(obj[key], val)
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} else if (!existing || options.duplicates === 'last') {
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obj[key] = val
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}
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}
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return obj
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}
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const parseObject = function (chain, val, options, valuesParsed) {
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let leaf = valuesParsed ? val : parseArrayValue(val, options)
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for (let i = chain.length - 1; i >= 0; --i) {
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let obj
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const root = chain[i]
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if (root === '[]' && options.parseArrays) {
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obj = options.allowEmptyArrays && leaf === '' ? [] : [].concat(leaf)
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} else {
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obj = options.plainObjects ? Object.create(null) : {}
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const cleanRoot =
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root.charAt(0) === '[' && root.charAt(root.length - 1) === ']' ? root.slice(1, -1) : root
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const decodedRoot = options.decodeDotInKeys ? cleanRoot.replace(/%2E/g, '.') : cleanRoot
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const index = parseInt(decodedRoot, 10)
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if (!options.parseArrays && decodedRoot === '') {
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obj = { 0: leaf }
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} else if (
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!isNaN(index) &&
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root !== decodedRoot &&
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String(index) === decodedRoot &&
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index >= 0 &&
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options.parseArrays &&
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index <= options.arrayLimit
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) {
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obj = []
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obj[index] = leaf
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} else if (decodedRoot !== '__proto__') {
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obj[decodedRoot] = leaf
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}
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}
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leaf = obj
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}
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return leaf
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}
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const parseKeys = function parseQueryStringKeys(givenKey, val, options, valuesParsed) {
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if (!givenKey) {
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return
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}
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// Transform dot notation to bracket notation
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const key = options.allowDots ? givenKey.replace(/\.([^.[]+)/g, '[$1]') : givenKey
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// The regex chunks
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const brackets = /(\[[^[\]]*])/
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const child = /(\[[^[\]]*])/g
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// Get the parent
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let segment = options.depth > 0 && brackets.exec(key)
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const parent = segment ? key.slice(0, segment.index) : key
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// Stash the parent if it exists
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const keys = []
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if (parent) {
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// If we aren't using plain objects, optionally prefix keys that would overwrite object prototype properties
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if (!options.plainObjects && has.call(Object.prototype, parent)) {
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if (!options.allowPrototypes) {
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return
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}
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}
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keys.push(parent)
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}
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// Loop through children appending to the array until we hit depth
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let i = 0
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while (options.depth > 0 && (segment = child.exec(key)) !== null && i < options.depth) {
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i += 1
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if (!options.plainObjects && has.call(Object.prototype, segment[1].slice(1, -1))) {
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if (!options.allowPrototypes) {
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return
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}
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}
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keys.push(segment[1])
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}
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// If there's a remainder, just add whatever is left
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if (segment) {
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keys.push('[' + key.slice(segment.index) + ']')
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}
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return parseObject(keys, val, options, valuesParsed)
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}
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const normalizeParseOptions = function normalizeParseOptions(opts) {
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if (!opts) {
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return defaults
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}
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if (typeof opts.allowEmptyArrays !== 'undefined' && typeof opts.allowEmptyArrays !== 'boolean') {
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throw new TypeError('`allowEmptyArrays` option can only be `true` or `false`, when provided')
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}
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if (typeof opts.decodeDotInKeys !== 'undefined' && typeof opts.decodeDotInKeys !== 'boolean') {
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throw new TypeError('`decodeDotInKeys` option can only be `true` or `false`, when provided')
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}
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if (
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opts.decoder !== null &&
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typeof opts.decoder !== 'undefined' &&
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typeof opts.decoder !== 'function'
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) {
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throw new TypeError('Decoder has to be a function.')
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}
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if (
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typeof opts.charset !== 'undefined' &&
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opts.charset !== 'utf-8' &&
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opts.charset !== 'iso-8859-1'
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) {
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throw new TypeError('The charset option must be either utf-8, iso-8859-1, or undefined')
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}
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const charset = typeof opts.charset === 'undefined' ? defaults.charset : opts.charset
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const duplicates = typeof opts.duplicates === 'undefined' ? defaults.duplicates : opts.duplicates
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if (duplicates !== 'combine' && duplicates !== 'first' && duplicates !== 'last') {
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throw new TypeError('The duplicates option must be either combine, first, or last')
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}
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const allowDots =
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typeof opts.allowDots === 'undefined'
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? opts.decodeDotInKeys === true
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? true
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: defaults.allowDots
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: !!opts.allowDots
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return {
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allowDots: allowDots,
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allowEmptyArrays:
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typeof opts.allowEmptyArrays === 'boolean'
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? !!opts.allowEmptyArrays
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: defaults.allowEmptyArrays,
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allowPrototypes:
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typeof opts.allowPrototypes === 'boolean' ? opts.allowPrototypes : defaults.allowPrototypes,
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allowSparse: typeof opts.allowSparse === 'boolean' ? opts.allowSparse : defaults.allowSparse,
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arrayLimit: typeof opts.arrayLimit === 'number' ? opts.arrayLimit : defaults.arrayLimit,
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charset: charset,
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charsetSentinel:
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typeof opts.charsetSentinel === 'boolean' ? opts.charsetSentinel : defaults.charsetSentinel,
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comma: typeof opts.comma === 'boolean' ? opts.comma : defaults.comma,
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decodeDotInKeys:
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typeof opts.decodeDotInKeys === 'boolean' ? opts.decodeDotInKeys : defaults.decodeDotInKeys,
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decoder: typeof opts.decoder === 'function' ? opts.decoder : defaults.decoder,
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delimiter:
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typeof opts.delimiter === 'string' || utils.isRegExp(opts.delimiter)
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? opts.delimiter
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: defaults.delimiter,
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// eslint-disable-next-line no-implicit-coercion, no-extra-parens
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depth: typeof opts.depth === 'number' || opts.depth === false ? +opts.depth : defaults.depth,
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duplicates: duplicates,
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ignoreQueryPrefix: opts.ignoreQueryPrefix === true,
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interpretNumericEntities:
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typeof opts.interpretNumericEntities === 'boolean'
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? opts.interpretNumericEntities
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: defaults.interpretNumericEntities,
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parameterLimit:
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typeof opts.parameterLimit === 'number' ? opts.parameterLimit : defaults.parameterLimit,
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parseArrays: opts.parseArrays !== false,
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plainObjects:
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typeof opts.plainObjects === 'boolean' ? opts.plainObjects : defaults.plainObjects,
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strictNullHandling:
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typeof opts.strictNullHandling === 'boolean'
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? opts.strictNullHandling
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: defaults.strictNullHandling,
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}
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}
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export function parse(str, opts) {
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const options = normalizeParseOptions(opts)
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if (str === '' || str === null || typeof str === 'undefined') {
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return options.plainObjects ? Object.create(null) : {}
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}
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const tempObj = typeof str === 'string' ? parseValues(str, options) : str
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let obj = options.plainObjects ? Object.create(null) : {}
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// Iterate over the keys and setup the new object
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const keys = Object.keys(tempObj)
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for (let i = 0; i < keys.length; ++i) {
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const key = keys[i]
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const newObj = parseKeys(key, tempObj[key], options, typeof str === 'string')
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obj = utils.merge(obj, newObj, options)
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}
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if (options.allowSparse === true) {
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return obj
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}
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return utils.compact(obj)
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}
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