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+'use strict'
+
+const { Headers, HeadersList, fill } = require('./headers')
+const { extractBody, cloneBody, mixinBody } = require('./body')
+const util = require('../core/util')
+const { kEnumerableProperty } = util
+const {
+ isValidReasonPhrase,
+ isCancelled,
+ isAborted,
+ isBlobLike,
+ serializeJavascriptValueToJSONString,
+ isErrorLike,
+ isomorphicEncode
+} = require('./util')
+const {
+ redirectStatusSet,
+ nullBodyStatus,
+ DOMException
+} = require('./constants')
+const { kState, kHeaders, kGuard, kRealm } = require('./symbols')
+const { webidl } = require('./webidl')
+const { FormData } = require('./formdata')
+const { getGlobalOrigin } = require('./global')
+const { URLSerializer } = require('./dataURL')
+const { kHeadersList, kConstruct } = require('../core/symbols')
+const assert = require('assert')
+const { types } = require('util')
+
+const ReadableStream = globalThis.ReadableStream || require('stream/web').ReadableStream
+const textEncoder = new TextEncoder('utf-8')
+
+// https://fetch.spec.whatwg.org/#response-class
+class Response {
+ // Creates network error Response.
+ static error () {
+ // TODO
+ const relevantRealm = { settingsObject: {} }
+
+ // The static error() method steps are to return the result of creating a
+ // Response object, given a new network error, "immutable", and this’s
+ // relevant Realm.
+ const responseObject = new Response()
+ responseObject[kState] = makeNetworkError()
+ responseObject[kRealm] = relevantRealm
+ responseObject[kHeaders][kHeadersList] = responseObject[kState].headersList
+ responseObject[kHeaders][kGuard] = 'immutable'
+ responseObject[kHeaders][kRealm] = relevantRealm
+ return responseObject
+ }
+
+ // https://fetch.spec.whatwg.org/#dom-response-json
+ static json (data, init = {}) {
+ webidl.argumentLengthCheck(arguments, 1, { header: 'Response.json' })
+
+ if (init !== null) {
+ init = webidl.converters.ResponseInit(init)
+ }
+
+ // 1. Let bytes the result of running serialize a JavaScript value to JSON bytes on data.
+ const bytes = textEncoder.encode(
+ serializeJavascriptValueToJSONString(data)
+ )
+
+ // 2. Let body be the result of extracting bytes.
+ const body = extractBody(bytes)
+
+ // 3. Let responseObject be the result of creating a Response object, given a new response,
+ // "response", and this’s relevant Realm.
+ const relevantRealm = { settingsObject: {} }
+ const responseObject = new Response()
+ responseObject[kRealm] = relevantRealm
+ responseObject[kHeaders][kGuard] = 'response'
+ responseObject[kHeaders][kRealm] = relevantRealm
+
+ // 4. Perform initialize a response given responseObject, init, and (body, "application/json").
+ initializeResponse(responseObject, init, { body: body[0], type: 'application/json' })
+
+ // 5. Return responseObject.
+ return responseObject
+ }
+
+ // Creates a redirect Response that redirects to url with status status.
+ static redirect (url, status = 302) {
+ const relevantRealm = { settingsObject: {} }
+
+ webidl.argumentLengthCheck(arguments, 1, { header: 'Response.redirect' })
+
+ url = webidl.converters.USVString(url)
+ status = webidl.converters['unsigned short'](status)
+
+ // 1. Let parsedURL be the result of parsing url with current settings
+ // object’s API base URL.
+ // 2. If parsedURL is failure, then throw a TypeError.
+ // TODO: base-URL?
+ let parsedURL
+ try {
+ parsedURL = new URL(url, getGlobalOrigin())
+ } catch (err) {
+ throw Object.assign(new TypeError('Failed to parse URL from ' + url), {
+ cause: err
+ })
+ }
+
+ // 3. If status is not a redirect status, then throw a RangeError.
+ if (!redirectStatusSet.has(status)) {
+ throw new RangeError('Invalid status code ' + status)
+ }
+
+ // 4. Let responseObject be the result of creating a Response object,
+ // given a new response, "immutable", and this’s relevant Realm.
+ const responseObject = new Response()
+ responseObject[kRealm] = relevantRealm
+ responseObject[kHeaders][kGuard] = 'immutable'
+ responseObject[kHeaders][kRealm] = relevantRealm
+
+ // 5. Set responseObject’s response’s status to status.
+ responseObject[kState].status = status
+
+ // 6. Let value be parsedURL, serialized and isomorphic encoded.
+ const value = isomorphicEncode(URLSerializer(parsedURL))
+
+ // 7. Append `Location`/value to responseObject’s response’s header list.
+ responseObject[kState].headersList.append('location', value)
+
+ // 8. Return responseObject.
+ return responseObject
+ }
+
+ // https://fetch.spec.whatwg.org/#dom-response
+ constructor (body = null, init = {}) {
+ if (body !== null) {
+ body = webidl.converters.BodyInit(body)
+ }
+
+ init = webidl.converters.ResponseInit(init)
+
+ // TODO
+ this[kRealm] = { settingsObject: {} }
+
+ // 1. Set this’s response to a new response.
+ this[kState] = makeResponse({})
+
+ // 2. Set this’s headers to a new Headers object with this’s relevant
+ // Realm, whose header list is this’s response’s header list and guard
+ // is "response".
+ this[kHeaders] = new Headers(kConstruct)
+ this[kHeaders][kGuard] = 'response'
+ this[kHeaders][kHeadersList] = this[kState].headersList
+ this[kHeaders][kRealm] = this[kRealm]
+
+ // 3. Let bodyWithType be null.
+ let bodyWithType = null
+
+ // 4. If body is non-null, then set bodyWithType to the result of extracting body.
+ if (body != null) {
+ const [extractedBody, type] = extractBody(body)
+ bodyWithType = { body: extractedBody, type }
+ }
+
+ // 5. Perform initialize a response given this, init, and bodyWithType.
+ initializeResponse(this, init, bodyWithType)
+ }
+
+ // Returns response’s type, e.g., "cors".
+ get type () {
+ webidl.brandCheck(this, Response)
+
+ // The type getter steps are to return this’s response’s type.
+ return this[kState].type
+ }
+
+ // Returns response’s URL, if it has one; otherwise the empty string.
+ get url () {
+ webidl.brandCheck(this, Response)
+
+ const urlList = this[kState].urlList
+
+ // The url getter steps are to return the empty string if this’s
+ // response’s URL is null; otherwise this’s response’s URL,
+ // serialized with exclude fragment set to true.
+ const url = urlList[urlList.length - 1] ?? null
+
+ if (url === null) {
+ return ''
+ }
+
+ return URLSerializer(url, true)
+ }
+
+ // Returns whether response was obtained through a redirect.
+ get redirected () {
+ webidl.brandCheck(this, Response)
+
+ // The redirected getter steps are to return true if this’s response’s URL
+ // list has more than one item; otherwise false.
+ return this[kState].urlList.length > 1
+ }
+
+ // Returns response’s status.
+ get status () {
+ webidl.brandCheck(this, Response)
+
+ // The status getter steps are to return this’s response’s status.
+ return this[kState].status
+ }
+
+ // Returns whether response’s status is an ok status.
+ get ok () {
+ webidl.brandCheck(this, Response)
+
+ // The ok getter steps are to return true if this’s response’s status is an
+ // ok status; otherwise false.
+ return this[kState].status >= 200 && this[kState].status <= 299
+ }
+
+ // Returns response’s status message.
+ get statusText () {
+ webidl.brandCheck(this, Response)
+
+ // The statusText getter steps are to return this’s response’s status
+ // message.
+ return this[kState].statusText
+ }
+
+ // Returns response’s headers as Headers.
+ get headers () {
+ webidl.brandCheck(this, Response)
+
+ // The headers getter steps are to return this’s headers.
+ return this[kHeaders]
+ }
+
+ get body () {
+ webidl.brandCheck(this, Response)
+
+ return this[kState].body ? this[kState].body.stream : null
+ }
+
+ get bodyUsed () {
+ webidl.brandCheck(this, Response)
+
+ return !!this[kState].body && util.isDisturbed(this[kState].body.stream)
+ }
+
+ // Returns a clone of response.
+ clone () {
+ webidl.brandCheck(this, Response)
+
+ // 1. If this is unusable, then throw a TypeError.
+ if (this.bodyUsed || (this.body && this.body.locked)) {
+ throw webidl.errors.exception({
+ header: 'Response.clone',
+ message: 'Body has already been consumed.'
+ })
+ }
+
+ // 2. Let clonedResponse be the result of cloning this’s response.
+ const clonedResponse = cloneResponse(this[kState])
+
+ // 3. Return the result of creating a Response object, given
+ // clonedResponse, this’s headers’s guard, and this’s relevant Realm.
+ const clonedResponseObject = new Response()
+ clonedResponseObject[kState] = clonedResponse
+ clonedResponseObject[kRealm] = this[kRealm]
+ clonedResponseObject[kHeaders][kHeadersList] = clonedResponse.headersList
+ clonedResponseObject[kHeaders][kGuard] = this[kHeaders][kGuard]
+ clonedResponseObject[kHeaders][kRealm] = this[kHeaders][kRealm]
+
+ return clonedResponseObject
+ }
+}
+
+mixinBody(Response)
+
+Object.defineProperties(Response.prototype, {
+ type: kEnumerableProperty,
+ url: kEnumerableProperty,
+ status: kEnumerableProperty,
+ ok: kEnumerableProperty,
+ redirected: kEnumerableProperty,
+ statusText: kEnumerableProperty,
+ headers: kEnumerableProperty,
+ clone: kEnumerableProperty,
+ body: kEnumerableProperty,
+ bodyUsed: kEnumerableProperty,
+ [Symbol.toStringTag]: {
+ value: 'Response',
+ configurable: true
+ }
+})
+
+Object.defineProperties(Response, {
+ json: kEnumerableProperty,
+ redirect: kEnumerableProperty,
+ error: kEnumerableProperty
+})
+
+// https://fetch.spec.whatwg.org/#concept-response-clone
+function cloneResponse (response) {
+ // To clone a response response, run these steps:
+
+ // 1. If response is a filtered response, then return a new identical
+ // filtered response whose internal response is a clone of response’s
+ // internal response.
+ if (response.internalResponse) {
+ return filterResponse(
+ cloneResponse(response.internalResponse),
+ response.type
+ )
+ }
+
+ // 2. Let newResponse be a copy of response, except for its body.
+ const newResponse = makeResponse({ ...response, body: null })
+
+ // 3. If response’s body is non-null, then set newResponse’s body to the
+ // result of cloning response’s body.
+ if (response.body != null) {
+ newResponse.body = cloneBody(response.body)
+ }
+
+ // 4. Return newResponse.
+ return newResponse
+}
+
+function makeResponse (init) {
+ return {
+ aborted: false,
+ rangeRequested: false,
+ timingAllowPassed: false,
+ requestIncludesCredentials: false,
+ type: 'default',
+ status: 200,
+ timingInfo: null,
+ cacheState: '',
+ statusText: '',
+ ...init,
+ headersList: init.headersList
+ ? new HeadersList(init.headersList)
+ : new HeadersList(),
+ urlList: init.urlList ? [...init.urlList] : []
+ }
+}
+
+function makeNetworkError (reason) {
+ const isError = isErrorLike(reason)
+ return makeResponse({
+ type: 'error',
+ status: 0,
+ error: isError
+ ? reason
+ : new Error(reason ? String(reason) : reason),
+ aborted: reason && reason.name === 'AbortError'
+ })
+}
+
+function makeFilteredResponse (response, state) {
+ state = {
+ internalResponse: response,
+ ...state
+ }
+
+ return new Proxy(response, {
+ get (target, p) {
+ return p in state ? state[p] : target[p]
+ },
+ set (target, p, value) {
+ assert(!(p in state))
+ target[p] = value
+ return true
+ }
+ })
+}
+
+// https://fetch.spec.whatwg.org/#concept-filtered-response
+function filterResponse (response, type) {
+ // Set response to the following filtered response with response as its
+ // internal response, depending on request’s response tainting:
+ if (type === 'basic') {
+ // A basic filtered response is a filtered response whose type is "basic"
+ // and header list excludes any headers in internal response’s header list
+ // whose name is a forbidden response-header name.
+
+ // Note: undici does not implement forbidden response-header names
+ return makeFilteredResponse(response, {
+ type: 'basic',
+ headersList: response.headersList
+ })
+ } else if (type === 'cors') {
+ // A CORS filtered response is a filtered response whose type is "cors"
+ // and header list excludes any headers in internal response’s header
+ // list whose name is not a CORS-safelisted response-header name, given
+ // internal response’s CORS-exposed header-name list.
+
+ // Note: undici does not implement CORS-safelisted response-header names
+ return makeFilteredResponse(response, {
+ type: 'cors',
+ headersList: response.headersList
+ })
+ } else if (type === 'opaque') {
+ // An opaque filtered response is a filtered response whose type is
+ // "opaque", URL list is the empty list, status is 0, status message
+ // is the empty byte sequence, header list is empty, and body is null.
+
+ return makeFilteredResponse(response, {
+ type: 'opaque',
+ urlList: Object.freeze([]),
+ status: 0,
+ statusText: '',
+ body: null
+ })
+ } else if (type === 'opaqueredirect') {
+ // An opaque-redirect filtered response is a filtered response whose type
+ // is "opaqueredirect", status is 0, status message is the empty byte
+ // sequence, header list is empty, and body is null.
+
+ return makeFilteredResponse(response, {
+ type: 'opaqueredirect',
+ status: 0,
+ statusText: '',
+ headersList: [],
+ body: null
+ })
+ } else {
+ assert(false)
+ }
+}
+
+// https://fetch.spec.whatwg.org/#appropriate-network-error
+function makeAppropriateNetworkError (fetchParams, err = null) {
+ // 1. Assert: fetchParams is canceled.
+ assert(isCancelled(fetchParams))
+
+ // 2. Return an aborted network error if fetchParams is aborted;
+ // otherwise return a network error.
+ return isAborted(fetchParams)
+ ? makeNetworkError(Object.assign(new DOMException('The operation was aborted.', 'AbortError'), { cause: err }))
+ : makeNetworkError(Object.assign(new DOMException('Request was cancelled.'), { cause: err }))
+}
+
+// https://whatpr.org/fetch/1392.html#initialize-a-response
+function initializeResponse (response, init, body) {
+ // 1. If init["status"] is not in the range 200 to 599, inclusive, then
+ // throw a RangeError.
+ if (init.status !== null && (init.status < 200 || init.status > 599)) {
+ throw new RangeError('init["status"] must be in the range of 200 to 599, inclusive.')
+ }
+
+ // 2. If init["statusText"] does not match the reason-phrase token production,
+ // then throw a TypeError.
+ if ('statusText' in init && init.statusText != null) {
+ // See, https://datatracker.ietf.org/doc/html/rfc7230#section-3.1.2:
+ // reason-phrase = *( HTAB / SP / VCHAR / obs-text )
+ if (!isValidReasonPhrase(String(init.statusText))) {
+ throw new TypeError('Invalid statusText')
+ }
+ }
+
+ // 3. Set response’s response’s status to init["status"].
+ if ('status' in init && init.status != null) {
+ response[kState].status = init.status
+ }
+
+ // 4. Set response’s response’s status message to init["statusText"].
+ if ('statusText' in init && init.statusText != null) {
+ response[kState].statusText = init.statusText
+ }
+
+ // 5. If init["headers"] exists, then fill response’s headers with init["headers"].
+ if ('headers' in init && init.headers != null) {
+ fill(response[kHeaders], init.headers)
+ }
+
+ // 6. If body was given, then:
+ if (body) {
+ // 1. If response's status is a null body status, then throw a TypeError.
+ if (nullBodyStatus.includes(response.status)) {
+ throw webidl.errors.exception({
+ header: 'Response constructor',
+ message: 'Invalid response status code ' + response.status
+ })
+ }
+
+ // 2. Set response's body to body's body.
+ response[kState].body = body.body
+
+ // 3. If body's type is non-null and response's header list does not contain
+ // `Content-Type`, then append (`Content-Type`, body's type) to response's header list.
+ if (body.type != null && !response[kState].headersList.contains('Content-Type')) {
+ response[kState].headersList.append('content-type', body.type)
+ }
+ }
+}
+
+webidl.converters.ReadableStream = webidl.interfaceConverter(
+ ReadableStream
+)
+
+webidl.converters.FormData = webidl.interfaceConverter(
+ FormData
+)
+
+webidl.converters.URLSearchParams = webidl.interfaceConverter(
+ URLSearchParams
+)
+
+// https://fetch.spec.whatwg.org/#typedefdef-xmlhttprequestbodyinit
+webidl.converters.XMLHttpRequestBodyInit = function (V) {
+ if (typeof V === 'string') {
+ return webidl.converters.USVString(V)
+ }
+
+ if (isBlobLike(V)) {
+ return webidl.converters.Blob(V, { strict: false })
+ }
+
+ if (types.isArrayBuffer(V) || types.isTypedArray(V) || types.isDataView(V)) {
+ return webidl.converters.BufferSource(V)
+ }
+
+ if (util.isFormDataLike(V)) {
+ return webidl.converters.FormData(V, { strict: false })
+ }
+
+ if (V instanceof URLSearchParams) {
+ return webidl.converters.URLSearchParams(V)
+ }
+
+ return webidl.converters.DOMString(V)
+}
+
+// https://fetch.spec.whatwg.org/#bodyinit
+webidl.converters.BodyInit = function (V) {
+ if (V instanceof ReadableStream) {
+ return webidl.converters.ReadableStream(V)
+ }
+
+ // Note: the spec doesn't include async iterables,
+ // this is an undici extension.
+ if (V?.[Symbol.asyncIterator]) {
+ return V
+ }
+
+ return webidl.converters.XMLHttpRequestBodyInit(V)
+}
+
+webidl.converters.ResponseInit = webidl.dictionaryConverter([
+ {
+ key: 'status',
+ converter: webidl.converters['unsigned short'],
+ defaultValue: 200
+ },
+ {
+ key: 'statusText',
+ converter: webidl.converters.ByteString,
+ defaultValue: ''
+ },
+ {
+ key: 'headers',
+ converter: webidl.converters.HeadersInit
+ }
+])
+
+module.exports = {
+ makeNetworkError,
+ makeResponse,
+ makeAppropriateNetworkError,
+ filterResponse,
+ Response,
+ cloneResponse
+}