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if (typeof FormData === 'undefined' || !FormData.prototype.keys) {
const global = typeof window === 'object'
? window : typeof self === 'object'
? self : this
// keep a reference to native implementation
const _FormData = global.FormData
// To be monkey patched
const _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
const _fetch = global.Request && global.fetch
// Unable to patch Request constructor correctly
// const _Request = global.Request
// only way is to use ES6 class extend
// https://github.com/babel/babel/issues/1966
const stringTag = global.Symbol && Symbol.toStringTag
const map = new WeakMap
const wm = o => map.get(o)
const arrayFrom = Array.from || (obj => [].slice.call(obj))
// Add missing stringTags to blob and files
if (stringTag) {
if (!Blob.prototype[stringTag]) {
Blob.prototype[stringTag] = 'Blob'
}
if ('File' in global && !File.prototype[stringTag]) {
File.prototype[stringTag] = 'File'
}
}
// Fix so you can construct your own File
try {
new File([], '')
} catch (a) {
global.File = function(b, d, c) {
const blob = new Blob(b, c)
const t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date
Object.defineProperties(blob, {
name: {
value: d
},
lastModifiedDate: {
value: t
},
lastModified: {
value: +t
},
toString: {
value() {
return '[object File]'
}
}
})
if (stringTag) {
Object.defineProperty(blob, stringTag, {
value: 'File'
})
}
return blob
}
}
function normalizeValue([value, filename]) {
if (value instanceof Blob)
// Should always returns a new File instance
// console.assert(fd.get(x) !== fd.get(x))
value = new File([value], filename, {
type: value.type,
lastModified: value.lastModified
})
return value
}
function stringify(name) {
if (!arguments.length)
throw new TypeError('1 argument required, but only 0 present.')
return [name + '']
}
function normalizeArgs(name, value, filename) {
if (arguments.length < 2)
throw new TypeError(
`2 arguments required, but only ${arguments.length} present.`
)
return value instanceof Blob
// normalize name and filename if adding an attachment
? [name + '', value, filename !== undefined
? filename + '' // Cast filename to string if 3th arg isn't undefined
: typeof value.name === 'string' // if name prop exist
? value.name // Use File.name
: 'blob'] // otherwise fallback to Blob
// If no attachment, just cast the args to strings
: [name + '', value + '']
}
function each (arr, cb) {
for (let i = 0; i < arr.length; i++) {
cb(arr[i])
}
}
/**
* @implements {Iterable}
*/
class FormDataPolyfill {
/**
* FormData class
*
* @param {HTMLElement=} form
*/
constructor(form) {
map.set(this, Object.create(null))
if (!form)
return this
const self = this
each(form.elements, elm => {
if (!elm.name || elm.disabled || elm.type === 'submit' || elm.type === 'button') return
if (elm.type === 'file') {
each(elm.files || [], file => {
self.append(elm.name, file)
})
} else if (elm.type === 'select-multiple' || elm.type === 'select-one') {
each(elm.options, opt => {
!opt.disabled && opt.selected && self.append(elm.name, opt.value)
})
} else if (elm.type === 'checkbox' || elm.type === 'radio') {
if (elm.checked) self.append(elm.name, elm.value)
} else {
self.append(elm.name, elm.value)
}
})
}
/**
* Append a field
*
* @param {String} name field name
* @param {String|Blob|File} value string / blob / file
* @param {String=} filename filename to use with blob
* @return {Undefined}
*/
append(name, value, filename) {
const map = wm(this)
if (!map[name])
map[name] = []
map[name].push([value, filename])
}
/**
* Delete all fields values given name
*
* @param {String} name Field name
* @return {Undefined}
*/
delete(name) {
delete wm(this)[name]
}
/**
* Iterate over all fields as [name, value]
*
* @return {Iterator}
*/
*entries() {
const map = wm(this)
for (let name in map)
for (let value of map[name])
yield [name, normalizeValue(value)]
}
/**
* Iterate over all fields
*
* @param {Function} callback Executed for each item with parameters (value, name, thisArg)
* @param {Object=} thisArg `this` context for callback function
* @return {Undefined}
*/
forEach(callback, thisArg) {
for (let [name, value] of this)
callback.call(thisArg, value, name, this)
}
/**
* Return first field value given name
* or null if non existen
*
* @param {String} name Field name
* @return {String|File|null} value Fields value
*/
get(name) {
const map = wm(this)
return map[name] ? normalizeValue(map[name][0]) : null
}
/**
* Return all fields values given name
*
* @param {String} name Fields name
* @return {Array} [{String|File}]
*/
getAll(name) {
return (wm(this)[name] || []).map(normalizeValue)
}
/**
* Check for field name existence
*
* @param {String} name Field name
* @return {boolean}
*/
has(name) {
return name in wm(this)
}
/**
* Iterate over all fields name
*
* @return {Iterator}
*/
*keys() {
for (let [name] of this)
yield name
}
/**
* Overwrite all values given name
*
* @param {String} name Filed name
* @param {String} value Field value
* @param {String=} filename Filename (optional)
* @return {Undefined}
*/
set(name, value, filename) {
wm(this)[name] = [[value, filename]]
}
/**
* Iterate over all fields
*
* @return {Iterator}
*/
*values() {
for (let [name, value] of this)
yield value
}
/**
* Return a native (perhaps degraded) FormData with only a `append` method
* Can throw if it's not supported
*
* @return {FormData}
*/
['_asNative']() {
const fd = new _FormData
for (let [name, value] of this)
fd.append(name, value)
return fd
}
/**
* [_blob description]
*
* @return {Blob} [description]
*/
['_blob']() {
const boundary = '----formdata-polyfill-' + Math.random()
const chunks = []
for (let [name, value] of this) {
chunks.push(`--${boundary}\r\n`)
if (value instanceof Blob) {
chunks.push(
`Content-Disposition: form-data; name="${name}"; filename="${value.name}"\r\n`,
`Content-Type: ${value.type || 'application/octet-stream'}\r\n\r\n`,
value,
'\r\n'
)
} else {
chunks.push(
`Content-Disposition: form-data; name="${name}"\r\n\r\n${value}\r\n`
)
}
}
chunks.push(`--${boundary}--`)
return new Blob(chunks, {type: 'multipart/form-data; boundary=' + boundary})
}
/**
* The class itself is iterable
* alias for formdata.entries()
*
* @return {Iterator}
*/
[Symbol.iterator]() {
return this.entries()
}
/**
* Create the default string description.
*
* @return {String} [object FormData]
*/
toString() {
return '[object FormData]'
}
}
if (stringTag) {
/**
* Create the default string description.
* It is accessed internally by the Object.prototype.toString().
*
* @return {String} FormData
*/
FormDataPolyfill.prototype[stringTag] = 'FormData'
}
const decorations = [
['append', normalizeArgs],
['delete', stringify],
['get', stringify],
['getAll', stringify],
['has', stringify],
['set', normalizeArgs]
]
decorations.forEach(arr => {
const orig = FormDataPolyfill.prototype[arr[0]]
FormDataPolyfill.prototype[arr[0]] = function() {
return orig.apply(this, arr[1].apply(this, arrayFrom(arguments)))
}
})
// Patch xhr's send method to call _blob transparently
if (_send) {
XMLHttpRequest.prototype.send = function(data) {
// I would check if Content-Type isn't already set
// But xhr lacks getRequestHeaders functionallity
// https://github.com/jimmywarting/FormData/issues/44
if (data instanceof FormDataPolyfill) {
const blob = data['_blob']()
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) {
const _fetch = global.fetch
global.fetch = function(input, init) {
if (init && init.body && init.body instanceof FormDataPolyfill) {
init.body = init.body['_blob']()
}
return _fetch(input, init)
}
}
global['FormData'] = FormDataPolyfill
}