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'use strict'
const util = require('../core/util')
const { ReadableStreamFrom, toUSVString, isBlobLike } = require('./util')
const { FormData } = require('./formdata')
const { kState } = require('./symbols')
const { webidl } = require('./webidl')
const { Blob } = require('buffer')
const { kBodyUsed } = require('../core/symbols')
const assert = require('assert')
const { NotSupportedError } = require('../core/errors')
const { isErrored } = require('../core/util')
const { isUint8Array, isArrayBuffer } = require('util/types')
let ReadableStream
async function * blobGen (blob) {
yield * blob.stream()
}
// https://fetch.spec.whatwg.org/#concept-bodyinit-extract
function extractBody (object, keepalive = false) {
if (!ReadableStream) {
ReadableStream = require('stream/web').ReadableStream
}
// 1. Let stream be object if object is a ReadableStream object.
// Otherwise, let stream be a new ReadableStream, and set up stream.
let stream = null
// 2. Let action be null.
let action = null
// 3. Let source be null.
let source = null
// 4. Let length be null.
let length = null
// 5. Let Content-Type be null.
let contentType = null
// 6. Switch on object:
if (object == null) {
// Note: The IDL processor cannot handle this situation. See
// https://crbug.com/335871.
} else if (object instanceof URLSearchParams) {
// URLSearchParams
// spec says to run application/x-www-form-urlencoded on body.list
// this is implemented in Node.js as apart of an URLSearchParams instance toString method
// See: https://github.com/nodejs/node/blob/e46c680bf2b211bbd52cf959ca17ee98c7f657f5/lib/internal/url.js#L490
// and https://github.com/nodejs/node/blob/e46c680bf2b211bbd52cf959ca17ee98c7f657f5/lib/internal/url.js#L1100
// Set source to the result of running the application/x-www-form-urlencoded serializer with object’s list.
source = object.toString()
// Set Content-Type to `application/x-www-form-urlencoded;charset=UTF-8`.
contentType = 'application/x-www-form-urlencoded;charset=UTF-8'
} else if (isArrayBuffer(object)) {
// BufferSource/ArrayBuffer
// Set source to a copy of the bytes held by object.
source = new Uint8Array(object.slice())
} else if (ArrayBuffer.isView(object)) {
// BufferSource/ArrayBufferView
// Set source to a copy of the bytes held by object.
source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
} else if (util.isFormDataLike(object)) {
const boundary = '----formdata-undici-' + Math.random()
const prefix = `--${boundary}\r\nContent-Disposition: form-data`
/*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
const escape = (str) =>
str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
const normalizeLinefeeds = (value) => value.replace(/\r?\n|\r/g, '\r\n')
// Set action to this step: run the multipart/form-data
// encoding algorithm, with object’s entry list and UTF-8.
action = async function * (object) {
const enc = new TextEncoder()
for (const [name, value] of object) {
if (typeof value === 'string') {
yield enc.encode(
prefix +
`; name="${escape(normalizeLinefeeds(name))}"` +
`\r\n\r\n${normalizeLinefeeds(value)}\r\n`
)
} else {
yield enc.encode(
prefix +
`; name="${escape(normalizeLinefeeds(name))}"` +
(value.name ? `; filename="${escape(value.name)}"` : '') +
'\r\n' +
`Content-Type: ${
value.type || 'application/octet-stream'
}\r\n\r\n`
)
yield * blobGen(value)
yield enc.encode('\r\n')
}
}
yield enc.encode(`--${boundary}--`)
}
// Set source to object.
source = object
// Set length to unclear, see html/6424 for improving this.
// TODO
// Set Content-Type to `multipart/form-data; boundary=`,
// followed by the multipart/form-data boundary string generated
// by the multipart/form-data encoding algorithm.
contentType = 'multipart/form-data; boundary=' + boundary
} else if (isBlobLike(object)) {
// Blob
// Set action to this step: read object.
action = blobGen
// Set source to object.
source = object
// Set length to object’s size.
length = object.size
// If object’s type attribute is not the empty byte sequence, set
// Content-Type to its value.
if (object.type) {
contentType = object.type
}
} else if (typeof object[Symbol.asyncIterator] === 'function') {
// If keepalive is true, then throw a TypeError.
if (keepalive) {
throw new TypeError('keepalive')
}
// If object is disturbed or locked, then throw a TypeError.
if (util.isDisturbed(object) || object.locked) {
throw new TypeError(
'Response body object should not be disturbed or locked'
)
}
stream =
object instanceof ReadableStream ? object : ReadableStreamFrom(object)
} else {
// TODO: byte sequence?
// TODO: scalar value string?
// TODO: else?
source = toUSVString(object)
contentType = 'text/plain;charset=UTF-8'
}
// 7. If source is a byte sequence, then set action to a
// step that returns source and length to source’s length.
// TODO: What is a "byte sequence?"
if (typeof source === 'string' || util.isBuffer(source)) {
length = Buffer.byteLength(source)
}
// 8. If action is non-null, then run these steps in in parallel:
if (action != null) {
// Run action.
let iterator
stream = new ReadableStream({
async start () {
iterator = action(object)[Symbol.asyncIterator]()
},
async pull (controller) {
const { value, done } = await iterator.next()
if (done) {
// When running action is done, close stream.
queueMicrotask(() => {
controller.close()
})
} else {
// Whenever one or more bytes are available and stream is not errored,
// enqueue a Uint8Array wrapping an ArrayBuffer containing the available
// bytes into stream.
if (!isErrored(stream)) {
controller.enqueue(new Uint8Array(value))
}
}
return controller.desiredSize > 0
},
async cancel (reason) {
await iterator.return()
}
})
} else if (!stream) {
// TODO: Spec doesn't say anything about this?
stream = new ReadableStream({
async pull (controller) {
controller.enqueue(
typeof source === 'string' ? new TextEncoder().encode(source) : source
)
queueMicrotask(() => {
controller.close()
})
}
})
}
// 9. Let body be a body whose stream is stream, source is source,
// and length is length.
const body = { stream, source, length }
// 10. Return body and Content-Type.
return [body, contentType]
}
// https://fetch.spec.whatwg.org/#bodyinit-safely-extract
function safelyExtractBody (object, keepalive = false) {
if (!ReadableStream) {
// istanbul ignore next
ReadableStream = require('stream/web').ReadableStream
}
// To safely extract a body and a `Content-Type` value from
// a byte sequence or BodyInit object object, run these steps:
// 1. If object is a ReadableStream object, then:
if (object instanceof ReadableStream) {
// Assert: object is neither disturbed nor locked.
// istanbul ignore next
assert(!util.isDisturbed(object), 'disturbed')
// istanbul ignore next
assert(!object.locked, 'locked')
}
// 2. Return the results of extracting object.
return extractBody(object, keepalive)
}
function cloneBody (body) {
// To clone a body body, run these steps:
// https://fetch.spec.whatwg.org/#concept-body-clone
// 1. Let « out1, out2 » be the result of teeing body’s stream.
const [out1, out2] = body.stream.tee()
// 2. Set body’s stream to out1.
body.stream = out1
// 3. Return a body whose stream is out2 and other members are copied from body.
return {
stream: out2,
length: body.length,
source: body.source
}
}
async function * consumeBody (body) {
if (body) {
if (isUint8Array(body)) {
yield body
} else {
const stream = body.stream
if (util.isDisturbed(stream)) {
throw new TypeError('disturbed')
}
if (stream.locked) {
throw new TypeError('locked')
}
// Compat.
stream[kBodyUsed] = true
yield * stream
}
}
}
function bodyMixinMethods (instance) {
const methods = {
async blob () {
if (!(this instanceof instance)) {
throw new TypeError('Illegal invocation')
}
const chunks = []
for await (const chunk of consumeBody(this[kState].body)) {
if (!isUint8Array(chunk)) {
throw new TypeError('Expected Uint8Array chunk')
}
// Assemble one final large blob with Uint8Array's can exhaust memory.
// That's why we create create multiple blob's and using references
chunks.push(new Blob([chunk]))
}
return new Blob(chunks, { type: this.headers.get('Content-Type') || '' })
},
async arrayBuffer () {
if (!(this instanceof instance)) {
throw new TypeError('Illegal invocation')
}
const contentLength = this.headers.get('content-length')
const encoded = this.headers.has('content-encoding')
// if we have content length and no encoding, then we can
// pre allocate the buffer and just read the data into it
if (!encoded && contentLength) {
const buffer = new Uint8Array(contentLength)
let offset = 0
for await (const chunk of consumeBody(this[kState].body)) {
if (!isUint8Array(chunk)) {
throw new TypeError('Expected Uint8Array chunk')
}
buffer.set(chunk, offset)
offset += chunk.length
}
return buffer.buffer
}
// if we don't have content length, then we have to allocate 2x the
// size of the body, once for consumed data, and once for the final buffer
// This could be optimized by using growable ArrayBuffer, but it's not
// implemented yet. https://github.com/tc39/proposal-resizablearraybuffer
const chunks = []
let size = 0
for await (const chunk of consumeBody(this[kState].body)) {
if (!isUint8Array(chunk)) {
throw new TypeError('Expected Uint8Array chunk')
}
chunks.push(chunk)
size += chunk.byteLength
}
const buffer = new Uint8Array(size)
let offset = 0
for (const chunk of chunks) {
buffer.set(chunk, offset)
offset += chunk.byteLength
}
return buffer.buffer
},
async text () {
if (!(this instanceof instance)) {
throw new TypeError('Illegal invocation')
}
let result = ''
const textDecoder = new TextDecoder()
for await (const chunk of consumeBody(this[kState].body)) {
if (!isUint8Array(chunk)) {
throw new TypeError('Expected Uint8Array chunk')
}
result += textDecoder.decode(chunk, { stream: true })
}
// flush
result += textDecoder.decode()
return result
},
async json () {
if (!(this instanceof instance)) {
throw new TypeError('Illegal invocation')
}
return JSON.parse(await this.text())
},
async formData () {
if (!(this instanceof instance)) {
throw new TypeError('Illegal invocation')
}
const contentType = this.headers.get('Content-Type')
// If mimeType’s essence is "multipart/form-data", then:
if (/multipart\/form-data/.test(contentType)) {
throw new NotSupportedError('multipart/form-data not supported')
} else if (/application\/x-www-form-urlencoded/.test(contentType)) {
// Otherwise, if mimeType’s essence is "application/x-www-form-urlencoded", then:
// 1. Let entries be the result of parsing bytes.
let entries
try {
let text = ''
// application/x-www-form-urlencoded parser will keep the BOM.
// https://url.spec.whatwg.org/#concept-urlencoded-parser
const textDecoder = new TextDecoder('utf-8', { ignoreBOM: true })
for await (const chunk of consumeBody(this[kState].body)) {
if (!isUint8Array(chunk)) {
throw new TypeError('Expected Uint8Array chunk')
}
text += textDecoder.decode(chunk, { stream: true })
}
text += textDecoder.decode()
entries = new URLSearchParams(text)
} catch (err) {
// istanbul ignore next: Unclear when new URLSearchParams can fail on a string.
// 2. If entries is failure, then throw a TypeError.
throw Object.assign(new TypeError(), { cause: err })
}
// 3. Return a new FormData object whose entries are entries.
const formData = new FormData()
for (const [name, value] of entries) {
formData.append(name, value)
}
return formData
} else {
// Otherwise, throw a TypeError.
webidl.errors.exception({
header: `${instance.name}.formData`,
value: 'Could not parse content as FormData.'
})
}
}
}
return methods
}
const properties = {
body: {
enumerable: true,
get () {
if (!this || !this[kState]) {
throw new TypeError('Illegal invocation')
}
return this[kState].body ? this[kState].body.stream : null
}
},
bodyUsed: {
enumerable: true,
get () {
if (!this || !this[kState]) {
throw new TypeError('Illegal invocation')
}
return !!this[kState].body && util.isDisturbed(this[kState].body.stream)
}
}
}
function mixinBody (prototype) {
Object.assign(prototype.prototype, bodyMixinMethods(prototype))
Object.defineProperties(prototype.prototype, properties)
}
module.exports = {
extractBody,
safelyExtractBody,
cloneBody,
mixinBody
}
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