390 lines
9.2 KiB
JavaScript
390 lines
9.2 KiB
JavaScript
if (typeof FormData === 'undefined' || !FormData.prototype.keys) {
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const global = typeof window === 'object'
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? window : typeof self === 'object'
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? 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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// Unable to patch Request constructor correctly
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// const _Request = global.Request
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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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const map = new WeakMap
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const wm = o => map.get(o)
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const arrayFrom = Array.from || (obj => [].slice.call(obj))
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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([], '')
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} catch (a) {
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global.File = function(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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lastModifiedDate: {
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value: t
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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 normalizeValue([value, filename]) {
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if (value instanceof Blob)
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// Should always returns a new File instance
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// console.assert(fd.get(x) !== fd.get(x))
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value = new File([value], filename, {
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type: value.type,
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lastModified: value.lastModified
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})
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return value
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}
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function stringify(name) {
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if (!arguments.length)
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throw new TypeError('1 argument required, but only 0 present.')
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return [name + '']
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}
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function normalizeArgs(name, value, filename) {
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if (arguments.length < 2)
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throw new TypeError(
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`2 arguments required, but only ${arguments.length} present.`
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)
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return value instanceof Blob
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// normalize name and filename if adding an attachment
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? [name + '', value, filename !== undefined
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? filename + '' // Cast filename to string if 3th arg isn't undefined
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: typeof value.name === 'string' // if name prop exist
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? value.name // Use File.name
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: 'blob'] // otherwise fallback to Blob
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// If no attachment, just cast the args to strings
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: [name + '', value + '']
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}
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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 {HTMLElement=} form
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*/
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constructor(form) {
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map.set(this, Object.create(null))
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if (!form)
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return this
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for (let elm of arrayFrom(form.elements)) {
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if (!elm.name || elm.disabled) continue
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if (elm.type === 'file')
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for (let file of arrayFrom(elm.files || []))
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this.append(elm.name, file)
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else if (elm.type === 'select-multiple' || elm.type === 'select-one')
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for (let opt of arrayFrom(elm.options))
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!opt.disabled && opt.selected && this.append(elm.name, opt.value)
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else if (elm.type === 'checkbox' || elm.type === 'radio') {
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if (elm.checked) this.append(elm.name, elm.value)
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} else
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this.append(elm.name, elm.value)
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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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const map = wm(this)
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if (!map[name])
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map[name] = []
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map[name].push([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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delete wm(this)[name]
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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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const map = wm(this)
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for (let name in map)
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for (let value of map[name])
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yield [name, normalizeValue(value)]
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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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* @return {Undefined}
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*/
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forEach(callback, thisArg) {
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for (let [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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* Return first field value given name
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* or null if non existen
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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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const map = wm(this)
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return map[name] ? normalizeValue(map[name][0]) : 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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return (wm(this)[name] || []).map(normalizeValue)
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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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return name in wm(this)
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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 (let [name] of this)
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yield name
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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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* @return {Undefined}
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*/
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set(name, value, filename) {
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wm(this)[name] = [[value, filename]]
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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 (let [name, value] of this)
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yield value
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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 (let [name, value] of this)
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fd.append(name, value)
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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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const chunks = []
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for (let [name, value] of this) {
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chunks.push(`--${boundary}\r\n`)
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if (value instanceof Blob) {
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chunks.push(
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`Content-Disposition: form-data; name="${name}"; filename="${value.name}"\r\n`,
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`Content-Type: ${value.type || 'application/octet-stream'}\r\n\r\n`,
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value,
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'\r\n'
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)
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} else {
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chunks.push(
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`Content-Disposition: form-data; name="${name}"\r\n\r\n${value}\r\n`
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)
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}
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}
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chunks.push(`--${boundary}--`)
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return new Blob(chunks, {type: 'multipart/form-data; boundary=' + boundary})
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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 (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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* @return {String} FormData
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*/
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FormDataPolyfill.prototype[stringTag] = 'FormData'
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}
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const decorations = [
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['append', normalizeArgs],
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['delete', stringify],
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['get', stringify],
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['getAll', stringify],
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['has', stringify],
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['set', normalizeArgs]
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]
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decorations.forEach(arr => {
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const orig = FormDataPolyfill.prototype[arr[0]]
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FormDataPolyfill.prototype[arr[0]] = function() {
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return orig.apply(this, arr[1].apply(this, arrayFrom(arguments)))
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}
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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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XMLHttpRequest.prototype.send = function(data) {
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// I would check if Content-Type isn't already set
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// But xhr lacks getRequestHeaders functionallity
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// https://github.com/jimmywarting/FormData/issues/44
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if (data instanceof FormDataPolyfill) {
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const blob = data['_blob']()
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this.setRequestHeader('Content-Type', blob.type)
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_send.call(this, blob)
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} else {
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_send.call(this, data)
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}
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}
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}
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// Patch fetch's function to call _blob transparently
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if (_fetch) {
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const _fetch = global.fetch
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global.fetch = function(input, init) {
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if (init && init.body && init.body instanceof FormDataPolyfill) {
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init.body = init.body['_blob']()
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}
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return _fetch(input, init)
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}
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}
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global['FormData'] = FormDataPolyfill
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}
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