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formdata.js
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formdata.js
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'use strict'
const { Blob } = require('buffer')
const { kState } = require('./symbols')
const { File } = require('./file')
const { HTMLFormElement, toUSVString } = require('./util')
class FormData {
constructor (...args) {
if (args.length > 0 && !(args[0] instanceof HTMLFormElement)) {
throw new TypeError(
"Failed to construct 'FormData': parameter 1 is not of type 'HTMLFormElement'"
)
}
this[kState] = []
}
append (...args) {
if (!(this instanceof FormData)) {
throw new TypeError('Illegal invocation')
}
if (args.length < 2) {
throw new TypeError(
`Failed to execute 'append' on 'FormData': 2 arguments required, but only ${args.length} present.`
)
}
if (args.length === 3 && !(args[1] instanceof Blob)) {
throw new TypeError(
"Failed to execute 'append' on 'FormData': parameter 2 is not of type 'Blob'"
)
}
const name = toUSVString(args[0])
const filename = args.length === 3 ? toUSVString(args[2]) : undefined
// 1. Let value be value if given; otherwise blobValue.
const value = args[1] instanceof Blob ? args[1] : toUSVString(args[1])
// 2. Let entry be the result of creating an entry with
// name, value, and filename if given.
const entry = makeEntry(name, value, filename)
// 3. Append entry to this’s entry list.
this[kState].push(entry)
}
delete (...args) {
if (!(this instanceof FormData)) {
throw new TypeError('Illegal invocation')
}
if (args.length < 1) {
throw new TypeError(
`Failed to execute 'delete' on 'FormData': 1 arguments required, but only ${args.length} present.`
)
}
const name = toUSVString(args[0])
// The delete(name) method steps are to remove all entries whose name
// is name from this’s entry list.
const next = []
for (const entry of this[kState]) {
if (entry.name !== name) {
next.push(entry)
}
}
this[kState] = next
}
get (...args) {
if (!(this instanceof FormData)) {
throw new TypeError('Illegal invocation')
}
if (args.length < 1) {
throw new TypeError(
`Failed to execute 'get' on 'FormData': 1 arguments required, but only ${args.length} present.`
)
}
const name = toUSVString(args[0])
// 1. If there is no entry whose name is name in this’s entry list,
// then return null.
const idx = this[kState].findIndex((entry) => entry.name === name)
if (idx === -1) {
return null
}
// 2. Return the value of the first entry whose name is name from
// this’s entry list.
return this[kState][idx].value
}
getAll (...args) {
if (!(this instanceof FormData)) {
throw new TypeError('Illegal invocation')
}
if (args.length < 1) {
throw new TypeError(
`Failed to execute 'getAll' on 'FormData': 1 arguments required, but only ${args.length} present.`
)
}
const name = toUSVString(args[0])
// 1. If there is no entry whose name is name in this’s entry list,
// then return the empty list.
// 2. Return the values of all entries whose name is name, in order,
// from this’s entry list.
return this[kState]
.filter((entry) => entry.name === name)
.map((entry) => entry.value)
}
has (...args) {
if (!(this instanceof FormData)) {
throw new TypeError('Illegal invocation')
}
if (args.length < 1) {
throw new TypeError(
`Failed to execute 'has' on 'FormData': 1 arguments required, but only ${args.length} present.`
)
}
const name = toUSVString(args[0])
// The has(name) method steps are to return true if there is an entry
// whose name is name in this’s entry list; otherwise false.
return this[kState].findIndex((entry) => entry.name === name) !== -1
}
set (...args) {
if (!(this instanceof FormData)) {
throw new TypeError('Illegal invocation')
}
if (args.length < 2) {
throw new TypeError(
`Failed to execute 'set' on 'FormData': 2 arguments required, but only ${args.length} present.`
)
}
if (args.length === 3 && !(args[1] instanceof Blob)) {
throw new TypeError(
"Failed to execute 'set' on 'FormData': parameter 2 is not of type 'Blob'"
)
}
const name = toUSVString(args[0])
const filename = args.length === 3 ? toUSVString(args[2]) : undefined
// The set(name, value) and set(name, blobValue, filename) method steps
// are:
// 1. Let value be value if given; otherwise blobValue.
const value = args[1] instanceof Blob ? args[1] : toUSVString(args[1])
// 2. Let entry be the result of creating an entry with name, value, and
// filename if given.
const entry = makeEntry(name, value, filename)
// 3. If there are entries in this’s entry list whose name is name, then
// replace the first such entry with entry and remove the others.
const idx = this[kState].findIndex((entry) => entry.name === name)
if (idx !== -1) {
this[kState] = [
...this[kState].slice(0, idx),
entry,
...this[kState].slice(idx + 1).filter((entry) => entry.name !== name)
]
} else {
// 4. Otherwise, append entry to this’s entry list.
this[kState].push(entry)
}
}
* [Symbol.iterator] () {
// The value pairs to iterate over are this’s entry list’s entries with
// the key being the name and the value being the value.
for (const { name, value } of this[kState]) {
yield [name, value]
}
}
}
function makeEntry (name, value, filename) {
// To create an entry for name, value, and optionally a filename, run these
// steps:
// 1. Let entry be a new entry.
const entry = {
name: null,
value: null
}
// 2. Set entry’s name to name.
entry.name = name
// 3. If value is a Blob object and not a File object, then set value to a new File
// object, representing the same bytes, whose name attribute value is "blob".
if (value instanceof Blob && !(value instanceof File)) {
value = new File([value], 'blob')
}
// 4. If value is (now) a File object and filename is given, then set value to a
// new File object, representing the same bytes, whose name attribute value is
// filename.
// TODO: This is a bit weird... What if passed value is a File?
// Do we just override the name attribute? Since it says "if value is (now)"
// does that mean that this lives inside the previous condition? In which case
// creating one more File instance doesn't make much sense....
if (value instanceof File && filename) {
value = new File([value], filename)
}
// 5. Set entry’s value to value.
entry.value = value
// 6. Return entry.
return entry
}
module.exports = { FormData: globalThis.FormData ?? FormData }