442 lines
12 KiB
JavaScript
442 lines
12 KiB
JavaScript
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/* formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
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/* global FormData self Blob File */
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/* eslint-disable no-inner-declarations */
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if (typeof Blob !== 'undefined' && (typeof FormData === 'undefined' || !FormData.prototype.keys)) {
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const global = typeof globalThis === 'object'
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? globalThis
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: typeof window === 'object'
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? window
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: typeof self === 'object' ? self : this
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// keep a reference to native implementation
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const _FormData = global.FormData
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// To be monkey patched
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const _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
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const _fetch = global.Request && global.fetch
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const _sendBeacon = global.navigator && global.navigator.sendBeacon
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// Might be a worker thread...
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const _match = global.Element && global.Element.prototype
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// Unable to patch Request/Response constructor correctly #109
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// only way is to use ES6 class extend
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// https://github.com/babel/babel/issues/1966
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const stringTag = global.Symbol && Symbol.toStringTag
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// Add missing stringTags to blob and files
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if (stringTag) {
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if (!Blob.prototype[stringTag]) {
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Blob.prototype[stringTag] = 'Blob'
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}
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if ('File' in global && !File.prototype[stringTag]) {
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File.prototype[stringTag] = 'File'
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}
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}
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// Fix so you can construct your own File
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try {
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new File([], '') // eslint-disable-line
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} catch (a) {
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global.File = function File (b, d, c) {
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const blob = new Blob(b, c || {})
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const t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date()
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Object.defineProperties(blob, {
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name: {
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value: d
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},
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lastModified: {
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value: +t
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},
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toString: {
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value () {
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return '[object File]'
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}
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}
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})
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if (stringTag) {
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Object.defineProperty(blob, stringTag, {
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value: 'File'
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})
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}
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return blob
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}
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}
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function ensureArgs (args, expected) {
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if (args.length < expected) {
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throw new TypeError(`${expected} argument required, but only ${args.length} present.`)
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}
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}
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/**
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* @param {string} name
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* @param {string | undefined} filename
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* @returns {[string, File|string]}
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*/
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function normalizeArgs (name, value, filename) {
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if (value instanceof Blob) {
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filename = filename !== undefined
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? String(filename + '')
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: typeof value.name === 'string'
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? value.name
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: 'blob'
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if (value.name !== filename || Object.prototype.toString.call(value) === '[object Blob]') {
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value = new File([value], filename)
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}
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return [String(name), value]
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}
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return [String(name), String(value)]
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}
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// normalize line feeds for textarea
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// https://html.spec.whatwg.org/multipage/form-elements.html#textarea-line-break-normalisation-transformation
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function normalizeLinefeeds (value) {
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return value.replace(/\r?\n|\r/g, '\r\n')
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}
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/**
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* @template T
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* @param {ArrayLike<T>} arr
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* @param {{ (elm: T): void; }} cb
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*/
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function each (arr, cb) {
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for (let i = 0; i < arr.length; i++) {
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cb(arr[i])
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}
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}
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const escape = str => str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
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/**
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* @implements {Iterable}
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*/
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class FormDataPolyfill {
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/**
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* FormData class
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*
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* @param {HTMLFormElement=} form
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*/
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constructor (form) {
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/** @type {[string, string|File][]} */
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this._data = []
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const self = this
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form && each(form.elements, (/** @type {HTMLInputElement} */ elm) => {
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if (
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!elm.name ||
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elm.disabled ||
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elm.type === 'submit' ||
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elm.type === 'button' ||
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elm.matches('form fieldset[disabled] *')
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) return
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if (elm.type === 'file') {
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const files = elm.files && elm.files.length
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? elm.files
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: [new File([], '', { type: 'application/octet-stream' })] // #78
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each(files, file => {
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self.append(elm.name, file)
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})
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} else if (elm.type === 'select-multiple' || elm.type === 'select-one') {
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each(elm.options, opt => {
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!opt.disabled && opt.selected && self.append(elm.name, opt.value)
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})
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} else if (elm.type === 'checkbox' || elm.type === 'radio') {
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if (elm.checked) self.append(elm.name, elm.value)
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} else {
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const value = elm.type === 'textarea' ? normalizeLinefeeds(elm.value) : elm.value
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self.append(elm.name, value)
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}
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})
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}
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/**
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* Append a field
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*
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* @param {string} name field name
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* @param {string|Blob|File} value string / blob / file
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* @param {string=} filename filename to use with blob
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* @return {undefined}
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*/
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append (name, value, filename) {
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ensureArgs(arguments, 2)
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this._data.push(normalizeArgs(name, value, filename))
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}
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/**
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* Delete all fields values given name
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*
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* @param {string} name Field name
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* @return {undefined}
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*/
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delete (name) {
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ensureArgs(arguments, 1)
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const result = []
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name = String(name)
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each(this._data, entry => {
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entry[0] !== name && result.push(entry)
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})
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this._data = result
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}
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/**
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* Iterate over all fields as [name, value]
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*
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* @return {Iterator}
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*/
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* entries () {
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for (var i = 0; i < this._data.length; i++) {
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yield this._data[i]
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}
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}
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/**
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* Iterate over all fields
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*
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* @param {Function} callback Executed for each item with parameters (value, name, thisArg)
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* @param {Object=} thisArg `this` context for callback function
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*/
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forEach (callback, thisArg) {
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ensureArgs(arguments, 1)
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for (const [name, value] of this) {
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callback.call(thisArg, value, name, this)
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}
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}
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/**
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* Return first field value given name
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* or null if non existent
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*
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* @param {string} name Field name
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* @return {string|File|null} value Fields value
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*/
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get (name) {
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ensureArgs(arguments, 1)
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const entries = this._data
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name = String(name)
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for (let i = 0; i < entries.length; i++) {
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if (entries[i][0] === name) {
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return entries[i][1]
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}
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}
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return null
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}
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/**
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* Return all fields values given name
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*
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* @param {string} name Fields name
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* @return {Array} [{String|File}]
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*/
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getAll (name) {
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ensureArgs(arguments, 1)
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const result = []
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name = String(name)
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each(this._data, data => {
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data[0] === name && result.push(data[1])
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})
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return result
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}
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/**
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* Check for field name existence
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*
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* @param {string} name Field name
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* @return {boolean}
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*/
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has (name) {
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ensureArgs(arguments, 1)
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name = String(name)
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for (let i = 0; i < this._data.length; i++) {
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if (this._data[i][0] === name) {
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return true
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}
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}
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return false
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}
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/**
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* Iterate over all fields name
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*
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* @return {Iterator}
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*/
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* keys () {
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for (const [name] of this) {
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yield name
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}
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}
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/**
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* Overwrite all values given name
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*
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* @param {string} name Filed name
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* @param {string} value Field value
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* @param {string=} filename Filename (optional)
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*/
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set (name, value, filename) {
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ensureArgs(arguments, 2)
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name = String(name)
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/** @type {[string, string|File][]} */
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const result = []
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const args = normalizeArgs(name, value, filename)
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let replace = true
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// - replace the first occurrence with same name
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// - discards the remaining with same name
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// - while keeping the same order items where added
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each(this._data, data => {
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data[0] === name
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? replace && (replace = !result.push(args))
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: result.push(data)
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})
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replace && result.push(args)
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this._data = result
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}
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/**
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* Iterate over all fields
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*
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* @return {Iterator}
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*/
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* values () {
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for (const [, value] of this) {
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yield value
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}
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}
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/**
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* Return a native (perhaps degraded) FormData with only a `append` method
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* Can throw if it's not supported
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*
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* @return {FormData}
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*/
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['_asNative'] () {
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const fd = new _FormData()
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for (const [name, value] of this) {
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fd.append(name, value)
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}
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return fd
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}
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/**
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* [_blob description]
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*
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* @return {Blob} [description]
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*/
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['_blob'] () {
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const boundary = '----formdata-polyfill-' + Math.random(),
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chunks = [],
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p = `--${boundary}\r\nContent-Disposition: form-data; name="`
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this.forEach((value, name) => typeof value == 'string'
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? chunks.push(p + escape(normalizeLinefeeds(name)) + `"\r\n\r\n${normalizeLinefeeds(value)}\r\n`)
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: chunks.push(p + escape(normalizeLinefeeds(name)) + `"; filename="${escape(value.name)}"\r\nContent-Type: ${value.type||"application/octet-stream"}\r\n\r\n`, value, `\r\n`))
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chunks.push(`--${boundary}--`)
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return new Blob(chunks, {
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type: "multipart/form-data; boundary=" + boundary
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})
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}
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/**
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* The class itself is iterable
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* alias for formdata.entries()
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*
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* @return {Iterator}
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*/
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[Symbol.iterator] () {
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return this.entries()
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}
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/**
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* Create the default string description.
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*
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* @return {string} [object FormData]
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*/
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toString () {
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return '[object FormData]'
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}
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}
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if (_match && !_match.matches) {
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_match.matches =
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_match.matchesSelector ||
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_match.mozMatchesSelector ||
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_match.msMatchesSelector ||
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_match.oMatchesSelector ||
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_match.webkitMatchesSelector ||
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function (s) {
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var matches = (this.document || this.ownerDocument).querySelectorAll(s)
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var i = matches.length
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while (--i >= 0 && matches.item(i) !== this) {}
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return i > -1
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}
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}
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if (stringTag) {
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/**
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* Create the default string description.
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* It is accessed internally by the Object.prototype.toString().
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*/
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FormDataPolyfill.prototype[stringTag] = 'FormData'
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}
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// Patch xhr's send method to call _blob transparently
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if (_send) {
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const setRequestHeader = global.XMLHttpRequest.prototype.setRequestHeader
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global.XMLHttpRequest.prototype.setRequestHeader = function (name, value) {
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setRequestHeader.call(this, name, value)
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if (name.toLowerCase() === 'content-type') this._hasContentType = true
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}
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global.XMLHttpRequest.prototype.send = function (data) {
|
||
|
|
// need to patch send b/c old IE don't send blob's type (#44)
|
||
|
|
if (data instanceof FormDataPolyfill) {
|
||
|
|
const blob = data['_blob']()
|
||
|
|
if (!this._hasContentType) this.setRequestHeader('Content-Type', blob.type)
|
||
|
|
_send.call(this, blob)
|
||
|
|
} else {
|
||
|
|
_send.call(this, data)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Patch fetch's function to call _blob transparently
|
||
|
|
if (_fetch) {
|
||
|
|
global.fetch = function (input, init) {
|
||
|
|
if (init && init.body && init.body instanceof FormDataPolyfill) {
|
||
|
|
init.body = init.body['_blob']()
|
||
|
|
}
|
||
|
|
|
||
|
|
return _fetch.call(this, input, init)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Patch navigator.sendBeacon to use native FormData
|
||
|
|
if (_sendBeacon) {
|
||
|
|
global.navigator.sendBeacon = function (url, data) {
|
||
|
|
if (data instanceof FormDataPolyfill) {
|
||
|
|
data = data['_asNative']()
|
||
|
|
}
|
||
|
|
return _sendBeacon.call(this, url, data)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
global['FormData'] = FormDataPolyfill
|
||
|
|
}
|