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index.js
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index.js
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// https://github.com/Ethan-Arrowood/undici-fetch
'use strict'
const {
makeNetworkError,
makeAppropriateNetworkError,
filterResponse,
makeResponse,
fromInnerResponse
} = require('./response')
const { HeadersList } = require('./headers')
const { Request, makeRequest } = require('./request')
const zlib = require('node:zlib')
const {
bytesMatch,
makePolicyContainer,
clonePolicyContainer,
requestBadPort,
TAOCheck,
appendRequestOriginHeader,
responseLocationURL,
requestCurrentURL,
setRequestReferrerPolicyOnRedirect,
tryUpgradeRequestToAPotentiallyTrustworthyURL,
createOpaqueTimingInfo,
appendFetchMetadata,
corsCheck,
crossOriginResourcePolicyCheck,
determineRequestsReferrer,
coarsenedSharedCurrentTime,
createDeferredPromise,
isBlobLike,
sameOrigin,
isCancelled,
isAborted,
isErrorLike,
fullyReadBody,
readableStreamClose,
isomorphicEncode,
urlIsLocal,
urlIsHttpHttpsScheme,
urlHasHttpsScheme,
clampAndCoarsenConnectionTimingInfo,
simpleRangeHeaderValue,
buildContentRange,
createInflate,
extractMimeType
} = require('./util')
const { kState } = require('./symbols')
const assert = require('node:assert')
const { safelyExtractBody, extractBody } = require('./body')
const {
redirectStatusSet,
nullBodyStatus,
safeMethodsSet,
requestBodyHeader,
subresourceSet
} = require('./constants')
const EE = require('node:events')
const { Readable, pipeline } = require('node:stream')
const { addAbortListener, isErrored, isReadable, nodeMajor, nodeMinor, bufferToLowerCasedHeaderName } = require('../core/util')
const { dataURLProcessor, serializeAMimeType, minimizeSupportedMimeType } = require('./dataURL')
const { getGlobalDispatcher } = require('../global')
const { webidl } = require('./webidl')
const { STATUS_CODES } = require('node:http')
const GET_OR_HEAD = ['GET', 'HEAD']
/** @type {import('buffer').resolveObjectURL} */
let resolveObjectURL
class Fetch extends EE {
constructor (dispatcher) {
super()
this.dispatcher = dispatcher
this.connection = null
this.dump = false
this.state = 'ongoing'
// 2 terminated listeners get added per request,
// but only 1 gets removed. If there are 20 redirects,
// 21 listeners will be added.
// See https://github.com/nodejs/undici/issues/1711
// TODO (fix): Find and fix root cause for leaked listener.
this.setMaxListeners(21)
}
terminate (reason) {
if (this.state !== 'ongoing') {
return
}
this.state = 'terminated'
this.connection?.destroy(reason)
this.emit('terminated', reason)
}
// https://fetch.spec.whatwg.org/#fetch-controller-abort
abort (error) {
if (this.state !== 'ongoing') {
return
}
// 1. Set controller’s state to "aborted".
this.state = 'aborted'
// 2. Let fallbackError be an "AbortError" DOMException.
// 3. Set error to fallbackError if it is not given.
if (!error) {
error = new DOMException('The operation was aborted.', 'AbortError')
}
// 4. Let serializedError be StructuredSerialize(error).
// If that threw an exception, catch it, and let
// serializedError be StructuredSerialize(fallbackError).
// 5. Set controller’s serialized abort reason to serializedError.
this.serializedAbortReason = error
this.connection?.destroy(error)
this.emit('terminated', error)
}
}
// https://fetch.spec.whatwg.org/#fetch-method
function fetch (input, init = undefined) {
webidl.argumentLengthCheck(arguments, 1, { header: 'globalThis.fetch' })
// 1. Let p be a new promise.
const p = createDeferredPromise()
// 2. Let requestObject be the result of invoking the initial value of
// Request as constructor with input and init as arguments. If this throws
// an exception, reject p with it and return p.
let requestObject
try {
requestObject = new Request(input, init)
} catch (e) {
p.reject(e)
return p.promise
}
// 3. Let request be requestObject’s request.
const request = requestObject[kState]
// 4. If requestObject’s signal’s aborted flag is set, then:
if (requestObject.signal.aborted) {
// 1. Abort the fetch() call with p, request, null, and
// requestObject’s signal’s abort reason.
abortFetch(p, request, null, requestObject.signal.reason)
// 2. Return p.
return p.promise
}
// 5. Let globalObject be request’s client’s global object.
const globalObject = request.client.globalObject
// 6. If globalObject is a ServiceWorkerGlobalScope object, then set
// request’s service-workers mode to "none".
if (globalObject?.constructor?.name === 'ServiceWorkerGlobalScope') {
request.serviceWorkers = 'none'
}
// 7. Let responseObject be null.
let responseObject = null
// 8. Let relevantRealm be this’s relevant Realm.
const relevantRealm = null
// 9. Let locallyAborted be false.
let locallyAborted = false
// 10. Let controller be null.
let controller = null
// 11. Add the following abort steps to requestObject’s signal:
addAbortListener(
requestObject.signal,
() => {
// 1. Set locallyAborted to true.
locallyAborted = true
// 2. Assert: controller is non-null.
assert(controller != null)
// 3. Abort controller with requestObject’s signal’s abort reason.
controller.abort(requestObject.signal.reason)
// 4. Abort the fetch() call with p, request, responseObject,
// and requestObject’s signal’s abort reason.
abortFetch(p, request, responseObject, requestObject.signal.reason)
}
)
// 12. Let handleFetchDone given response response be to finalize and
// report timing with response, globalObject, and "fetch".
const handleFetchDone = (response) =>
finalizeAndReportTiming(response, 'fetch')
// 13. Set controller to the result of calling fetch given request,
// with processResponseEndOfBody set to handleFetchDone, and processResponse
// given response being these substeps:
const processResponse = (response) => {
// 1. If locallyAborted is true, terminate these substeps.
if (locallyAborted) {
return Promise.resolve()
}
// 2. If response’s aborted flag is set, then:
if (response.aborted) {
// 1. Let deserializedError be the result of deserialize a serialized
// abort reason given controller’s serialized abort reason and
// relevantRealm.
// 2. Abort the fetch() call with p, request, responseObject, and
// deserializedError.
abortFetch(p, request, responseObject, controller.serializedAbortReason)
return Promise.resolve()
}
// 3. If response is a network error, then reject p with a TypeError
// and terminate these substeps.
if (response.type === 'error') {
p.reject(new TypeError('fetch failed', { cause: response.error }))
return Promise.resolve()
}
// 4. Set responseObject to the result of creating a Response object,
// given response, "immutable", and relevantRealm.
responseObject = fromInnerResponse(response, 'immutable', relevantRealm)
// 5. Resolve p with responseObject.
p.resolve(responseObject)
}
controller = fetching({
request,
processResponseEndOfBody: handleFetchDone,
processResponse,
dispatcher: init?.dispatcher ?? getGlobalDispatcher() // undici
})
// 14. Return p.
return p.promise
}
// https://fetch.spec.whatwg.org/#finalize-and-report-timing
function finalizeAndReportTiming (response, initiatorType = 'other') {
// 1. If response is an aborted network error, then return.
if (response.type === 'error' && response.aborted) {
return
}
// 2. If response’s URL list is null or empty, then return.
if (!response.urlList?.length) {
return
}
// 3. Let originalURL be response’s URL list[0].
const originalURL = response.urlList[0]
// 4. Let timingInfo be response’s timing info.
let timingInfo = response.timingInfo
// 5. Let cacheState be response’s cache state.
let cacheState = response.cacheState
// 6. If originalURL’s scheme is not an HTTP(S) scheme, then return.
if (!urlIsHttpHttpsScheme(originalURL)) {
return
}
// 7. If timingInfo is null, then return.
if (timingInfo === null) {
return
}
// 8. If response’s timing allow passed flag is not set, then:
if (!response.timingAllowPassed) {
// 1. Set timingInfo to a the result of creating an opaque timing info for timingInfo.
timingInfo = createOpaqueTimingInfo({
startTime: timingInfo.startTime
})
// 2. Set cacheState to the empty string.
cacheState = ''
}
// 9. Set timingInfo’s end time to the coarsened shared current time
// given global’s relevant settings object’s cross-origin isolated
// capability.
// TODO: given global’s relevant settings object’s cross-origin isolated
// capability?
timingInfo.endTime = coarsenedSharedCurrentTime()
// 10. Set response’s timing info to timingInfo.
response.timingInfo = timingInfo
// 11. Mark resource timing for timingInfo, originalURL, initiatorType,
// global, and cacheState.
markResourceTiming(
timingInfo,
originalURL.href,
initiatorType,
globalThis,
cacheState
)
}
// https://w3c.github.io/resource-timing/#dfn-mark-resource-timing
const markResourceTiming = (nodeMajor > 18 || (nodeMajor === 18 && nodeMinor >= 2))
? performance.markResourceTiming
: () => {}
// https://fetch.spec.whatwg.org/#abort-fetch
function abortFetch (p, request, responseObject, error) {
// 1. Reject promise with error.
p.reject(error)
// 2. If request’s body is not null and is readable, then cancel request’s
// body with error.
if (request.body != null && isReadable(request.body?.stream)) {
request.body.stream.cancel(error).catch((err) => {
if (err.code === 'ERR_INVALID_STATE') {
// Node bug?
return
}
throw err
})
}
// 3. If responseObject is null, then return.
if (responseObject == null) {
return
}
// 4. Let response be responseObject’s response.
const response = responseObject[kState]
// 5. If response’s body is not null and is readable, then error response’s
// body with error.
if (response.body != null && isReadable(response.body?.stream)) {
response.body.stream.cancel(error).catch((err) => {
if (err.code === 'ERR_INVALID_STATE') {
// Node bug?
return
}
throw err
})
}
}
// https://fetch.spec.whatwg.org/#fetching
function fetching ({
request,
processRequestBodyChunkLength,
processRequestEndOfBody,
processResponse,
processResponseEndOfBody,
processResponseConsumeBody,
useParallelQueue = false,
dispatcher // undici
}) {
// This has bitten me in the ass more times than I'd like to admit.
assert(dispatcher)
// 1. Let taskDestination be null.
let taskDestination = null
// 2. Let crossOriginIsolatedCapability be false.
let crossOriginIsolatedCapability = false
// 3. If request’s client is non-null, then:
if (request.client != null) {
// 1. Set taskDestination to request’s client’s global object.
taskDestination = request.client.globalObject
// 2. Set crossOriginIsolatedCapability to request’s client’s cross-origin
// isolated capability.
crossOriginIsolatedCapability =
request.client.crossOriginIsolatedCapability
}
// 4. If useParallelQueue is true, then set taskDestination to the result of
// starting a new parallel queue.
// TODO
// 5. Let timingInfo be a new fetch timing info whose start time and
// post-redirect start time are the coarsened shared current time given
// crossOriginIsolatedCapability.
const currentTime = coarsenedSharedCurrentTime(crossOriginIsolatedCapability)
const timingInfo = createOpaqueTimingInfo({
startTime: currentTime
})
// 6. Let fetchParams be a new fetch params whose
// request is request,
// timing info is timingInfo,
// process request body chunk length is processRequestBodyChunkLength,
// process request end-of-body is processRequestEndOfBody,
// process response is processResponse,
// process response consume body is processResponseConsumeBody,
// process response end-of-body is processResponseEndOfBody,
// task destination is taskDestination,
// and cross-origin isolated capability is crossOriginIsolatedCapability.
const fetchParams = {
controller: new Fetch(dispatcher),
request,
timingInfo,
processRequestBodyChunkLength,
processRequestEndOfBody,
processResponse,
processResponseConsumeBody,
processResponseEndOfBody,
taskDestination,
crossOriginIsolatedCapability
}
// 7. If request’s body is a byte sequence, then set request’s body to
// request’s body as a body.
// NOTE: Since fetching is only called from fetch, body should already be
// extracted.
assert(!request.body || request.body.stream)
// 8. If request’s window is "client", then set request’s window to request’s
// client, if request’s client’s global object is a Window object; otherwise
// "no-window".
if (request.window === 'client') {
// TODO: What if request.client is null?
request.window =
request.client?.globalObject?.constructor?.name === 'Window'
? request.client
: 'no-window'
}
// 9. If request’s origin is "client", then set request’s origin to request’s
// client’s origin.
if (request.origin === 'client') {
// TODO: What if request.client is null?
request.origin = request.client?.origin
}
// 10. If all of the following conditions are true:
// TODO
// 11. If request’s policy container is "client", then:
if (request.policyContainer === 'client') {
// 1. If request’s client is non-null, then set request’s policy
// container to a clone of request’s client’s policy container. [HTML]
if (request.client != null) {
request.policyContainer = clonePolicyContainer(
request.client.policyContainer
)
} else {
// 2. Otherwise, set request’s policy container to a new policy
// container.
request.policyContainer = makePolicyContainer()
}
}
// 12. If request’s header list does not contain `Accept`, then:
if (!request.headersList.contains('accept', true)) {
// 1. Let value be `*/*`.
const value = '*/*'
// 2. A user agent should set value to the first matching statement, if
// any, switching on request’s destination:
// "document"
// "frame"
// "iframe"
// `text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8`
// "image"
// `image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5`
// "style"
// `text/css,*/*;q=0.1`
// TODO
// 3. Append `Accept`/value to request’s header list.
request.headersList.append('accept', value, true)
}
// 13. If request’s header list does not contain `Accept-Language`, then
// user agents should append `Accept-Language`/an appropriate value to
// request’s header list.
if (!request.headersList.contains('accept-language', true)) {
request.headersList.append('accept-language', '*', true)
}
// 14. If request’s priority is null, then use request’s initiator and
// destination appropriately in setting request’s priority to a
// user-agent-defined object.
if (request.priority === null) {
// TODO
}
// 15. If request is a subresource request, then:
if (subresourceSet.has(request.destination)) {
// TODO
}
// 16. Run main fetch given fetchParams.
mainFetch(fetchParams)
.catch(err => {
fetchParams.controller.terminate(err)
})
// 17. Return fetchParam's controller
return fetchParams.controller
}
// https://fetch.spec.whatwg.org/#concept-main-fetch
async function mainFetch (fetchParams, recursive = false) {
// 1. Let request be fetchParams’s request.
const request = fetchParams.request
// 2. Let response be null.
let response = null
// 3. If request’s local-URLs-only flag is set and request’s current URL is
// not local, then set response to a network error.
if (request.localURLsOnly && !urlIsLocal(requestCurrentURL(request))) {
response = makeNetworkError('local URLs only')
}
// 4. Run report Content Security Policy violations for request.
// TODO
// 5. Upgrade request to a potentially trustworthy URL, if appropriate.
tryUpgradeRequestToAPotentiallyTrustworthyURL(request)
// 6. If should request be blocked due to a bad port, should fetching request
// be blocked as mixed content, or should request be blocked by Content
// Security Policy returns blocked, then set response to a network error.
if (requestBadPort(request) === 'blocked') {
response = makeNetworkError('bad port')
}
// TODO: should fetching request be blocked as mixed content?
// TODO: should request be blocked by Content Security Policy?
// 7. If request’s referrer policy is the empty string, then set request’s
// referrer policy to request’s policy container’s referrer policy.
if (request.referrerPolicy === '') {
request.referrerPolicy = request.policyContainer.referrerPolicy
}
// 8. If request’s referrer is not "no-referrer", then set request’s
// referrer to the result of invoking determine request’s referrer.
if (request.referrer !== 'no-referrer') {
request.referrer = determineRequestsReferrer(request)
}
// 9. Set request’s current URL’s scheme to "https" if all of the following
// conditions are true:
// - request’s current URL’s scheme is "http"
// - request’s current URL’s host is a domain
// - Matching request’s current URL’s host per Known HSTS Host Domain Name
// Matching results in either a superdomain match with an asserted
// includeSubDomains directive or a congruent match (with or without an
// asserted includeSubDomains directive). [HSTS]
// TODO
// 10. If recursive is false, then run the remaining steps in parallel.
// TODO
// 11. If response is null, then set response to the result of running
// the steps corresponding to the first matching statement:
if (response === null) {
response = await (async () => {
const currentURL = requestCurrentURL(request)
if (
// - request’s current URL’s origin is same origin with request’s origin,
// and request’s response tainting is "basic"
(sameOrigin(currentURL, request.url) && request.responseTainting === 'basic') ||
// request’s current URL’s scheme is "data"
(currentURL.protocol === 'data:') ||
// - request’s mode is "navigate" or "websocket"
(request.mode === 'navigate' || request.mode === 'websocket')
) {
// 1. Set request’s response tainting to "basic".
request.responseTainting = 'basic'
// 2. Return the result of running scheme fetch given fetchParams.
return await schemeFetch(fetchParams)
}
// request’s mode is "same-origin"
if (request.mode === 'same-origin') {
// 1. Return a network error.
return makeNetworkError('request mode cannot be "same-origin"')
}
// request’s mode is "no-cors"
if (request.mode === 'no-cors') {
// 1. If request’s redirect mode is not "follow", then return a network
// error.
if (request.redirect !== 'follow') {
return makeNetworkError(
'redirect mode cannot be "follow" for "no-cors" request'
)
}
// 2. Set request’s response tainting to "opaque".
request.responseTainting = 'opaque'
// 3. Return the result of running scheme fetch given fetchParams.
return await schemeFetch(fetchParams)
}
// request’s current URL’s scheme is not an HTTP(S) scheme
if (!urlIsHttpHttpsScheme(requestCurrentURL(request))) {
// Return a network error.
return makeNetworkError('URL scheme must be a HTTP(S) scheme')
}
// - request’s use-CORS-preflight flag is set
// - request’s unsafe-request flag is set and either request’s method is
// not a CORS-safelisted method or CORS-unsafe request-header names with
// request’s header list is not empty
// 1. Set request’s response tainting to "cors".
// 2. Let corsWithPreflightResponse be the result of running HTTP fetch
// given fetchParams and true.
// 3. If corsWithPreflightResponse is a network error, then clear cache
// entries using request.
// 4. Return corsWithPreflightResponse.
// TODO
// Otherwise
// 1. Set request’s response tainting to "cors".
request.responseTainting = 'cors'
// 2. Return the result of running HTTP fetch given fetchParams.
return await httpFetch(fetchParams)
})()
}
// 12. If recursive is true, then return response.
if (recursive) {
return response
}
// 13. If response is not a network error and response is not a filtered
// response, then:
if (response.status !== 0 && !response.internalResponse) {
// If request’s response tainting is "cors", then:
if (request.responseTainting === 'cors') {
// 1. Let headerNames be the result of extracting header list values
// given `Access-Control-Expose-Headers` and response’s header list.
// TODO
// 2. If request’s credentials mode is not "include" and headerNames
// contains `*`, then set response’s CORS-exposed header-name list to
// all unique header names in response’s header list.
// TODO
// 3. Otherwise, if headerNames is not null or failure, then set
// response’s CORS-exposed header-name list to headerNames.
// TODO
}
// Set response to the following filtered response with response as its
// internal response, depending on request’s response tainting:
if (request.responseTainting === 'basic') {
response = filterResponse(response, 'basic')
} else if (request.responseTainting === 'cors') {
response = filterResponse(response, 'cors')
} else if (request.responseTainting === 'opaque') {
response = filterResponse(response, 'opaque')
} else {
assert(false)
}
}
// 14. Let internalResponse be response, if response is a network error,
// and response’s internal response otherwise.
let internalResponse =
response.status === 0 ? response : response.internalResponse
// 15. If internalResponse’s URL list is empty, then set it to a clone of
// request’s URL list.
if (internalResponse.urlList.length === 0) {
internalResponse.urlList.push(...request.urlList)
}
// 16. If request’s timing allow failed flag is unset, then set
// internalResponse’s timing allow passed flag.
if (!request.timingAllowFailed) {
response.timingAllowPassed = true
}
// 17. If response is not a network error and any of the following returns
// blocked
// - should internalResponse to request be blocked as mixed content
// - should internalResponse to request be blocked by Content Security Policy
// - should internalResponse to request be blocked due to its MIME type
// - should internalResponse to request be blocked due to nosniff
// TODO
// 18. If response’s type is "opaque", internalResponse’s status is 206,
// internalResponse’s range-requested flag is set, and request’s header
// list does not contain `Range`, then set response and internalResponse
// to a network error.
if (
response.type === 'opaque' &&
internalResponse.status === 206 &&
internalResponse.rangeRequested &&
!request.headers.contains('range', true)
) {
response = internalResponse = makeNetworkError()
}
// 19. If response is not a network error and either request’s method is
// `HEAD` or `CONNECT`, or internalResponse’s status is a null body status,
// set internalResponse’s body to null and disregard any enqueuing toward
// it (if any).
if (
response.status !== 0 &&
(request.method === 'HEAD' ||
request.method === 'CONNECT' ||
nullBodyStatus.includes(internalResponse.status))
) {
internalResponse.body = null
fetchParams.controller.dump = true
}
// 20. If request’s integrity metadata is not the empty string, then:
if (request.integrity) {
// 1. Let processBodyError be this step: run fetch finale given fetchParams
// and a network error.
const processBodyError = (reason) =>
fetchFinale(fetchParams, makeNetworkError(reason))
// 2. If request’s response tainting is "opaque", or response’s body is null,
// then run processBodyError and abort these steps.
if (request.responseTainting === 'opaque' || response.body == null) {
processBodyError(response.error)
return
}
// 3. Let processBody given bytes be these steps:
const processBody = (bytes) => {
// 1. If bytes do not match request’s integrity metadata,
// then run processBodyError and abort these steps. [SRI]
if (!bytesMatch(bytes, request.integrity)) {
processBodyError('integrity mismatch')
return
}
// 2. Set response’s body to bytes as a body.
response.body = safelyExtractBody(bytes)[0]
// 3. Run fetch finale given fetchParams and response.
fetchFinale(fetchParams, response)
}
// 4. Fully read response’s body given processBody and processBodyError.
await fullyReadBody(response.body, processBody, processBodyError)
} else {
// 21. Otherwise, run fetch finale given fetchParams and response.
fetchFinale(fetchParams, response)
}
}
// https://fetch.spec.whatwg.org/#concept-scheme-fetch
// given a fetch params fetchParams
function schemeFetch (fetchParams) {
// Note: since the connection is destroyed on redirect, which sets fetchParams to a
// cancelled state, we do not want this condition to trigger *unless* there have been
// no redirects. See https://github.com/nodejs/undici/issues/1776
// 1. If fetchParams is canceled, then return the appropriate network error for fetchParams.
if (isCancelled(fetchParams) && fetchParams.request.redirectCount === 0) {
return Promise.resolve(makeAppropriateNetworkError(fetchParams))
}
// 2. Let request be fetchParams’s request.
const { request } = fetchParams
const { protocol: scheme } = requestCurrentURL(request)
// 3. Switch on request’s current URL’s scheme and run the associated steps:
switch (scheme) {
case 'about:': {
// If request’s current URL’s path is the string "blank", then return a new response
// whose status message is `OK`, header list is « (`Content-Type`, `text/html;charset=utf-8`) »,
// and body is the empty byte sequence as a body.
// Otherwise, return a network error.
return Promise.resolve(makeNetworkError('about scheme is not supported'))
}
case 'blob:': {
if (!resolveObjectURL) {
resolveObjectURL = require('node:buffer').resolveObjectURL
}
// 1. Let blobURLEntry be request’s current URL’s blob URL entry.
const blobURLEntry = requestCurrentURL(request)
// https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L52-L56
// Buffer.resolveObjectURL does not ignore URL queries.
if (blobURLEntry.search.length !== 0) {
return Promise.resolve(makeNetworkError('NetworkError when attempting to fetch resource.'))
}
const blob = resolveObjectURL(blobURLEntry.toString())
// 2. If request’s method is not `GET`, blobURLEntry is null, or blobURLEntry’s
// object is not a Blob object, then return a network error.
if (request.method !== 'GET' || !isBlobLike(blob)) {
return Promise.resolve(makeNetworkError('invalid method'))
}
// 3. Let blob be blobURLEntry’s object.
// Note: done above
// 4. Let response be a new response.
const response = makeResponse()
// 5. Let fullLength be blob’s size.
const fullLength = blob.size
// 6. Let serializedFullLength be fullLength, serialized and isomorphic encoded.
const serializedFullLength = isomorphicEncode(`${fullLength}`)
// 7. Let type be blob’s type.
const type = blob.type
// 8. If request’s header list does not contain `Range`:
// 9. Otherwise:
if (!request.headersList.contains('range', true)) {
// 1. Let bodyWithType be the result of safely extracting blob.
// Note: in the FileAPI a blob "object" is a Blob *or* a MediaSource.
// In node, this can only ever be a Blob. Therefore we can safely
// use extractBody directly.
const bodyWithType = extractBody(blob)
// 2. Set response’s status message to `OK`.
response.statusText = 'OK'
// 3. Set response’s body to bodyWithType’s body.
response.body = bodyWithType[0]
// 4. Set response’s header list to « (`Content-Length`, serializedFullLength), (`Content-Type`, type) ».
response.headersList.set('content-length', serializedFullLength, true)
response.headersList.set('content-type', type, true)
} else {
// 1. Set response’s range-requested flag.
response.rangeRequested = true
// 2. Let rangeHeader be the result of getting `Range` from request’s header list.
const rangeHeader = request.headersList.get('range', true)
// 3. Let rangeValue be the result of parsing a single range header value given rangeHeader and true.
const rangeValue = simpleRangeHeaderValue(rangeHeader, true)
// 4. If rangeValue is failure, then return a network error.
if (rangeValue === 'failure') {
return Promise.resolve(makeNetworkError('failed to fetch the data URL'))
}
// 5. Let (rangeStart, rangeEnd) be rangeValue.
let { rangeStartValue: rangeStart, rangeEndValue: rangeEnd } = rangeValue
// 6. If rangeStart is null:
// 7. Otherwise:
if (rangeStart === null) {
// 1. Set rangeStart to fullLength − rangeEnd.
rangeStart = fullLength - rangeEnd
// 2. Set rangeEnd to rangeStart + rangeEnd − 1.
rangeEnd = rangeStart + rangeEnd - 1
} else {
// 1. If rangeStart is greater than or equal to fullLength, then return a network error.
if (rangeStart >= fullLength) {
return Promise.resolve(makeNetworkError('Range start is greater than the blob\'s size.'))
}
// 2. If rangeEnd is null or rangeEnd is greater than or equal to fullLength, then set
// rangeEnd to fullLength − 1.
if (rangeEnd === null || rangeEnd >= fullLength) {
rangeEnd = fullLength - 1
}
}
// 8. Let slicedBlob be the result of invoking slice blob given blob, rangeStart,
// rangeEnd + 1, and type.
const slicedBlob = blob.slice(rangeStart, rangeEnd, type)
// 9. Let slicedBodyWithType be the result of safely extracting slicedBlob.
// Note: same reason as mentioned above as to why we use extractBody
const slicedBodyWithType = extractBody(slicedBlob)
// 10. Set response’s body to slicedBodyWithType’s body.
response.body = slicedBodyWithType[0]
// 11. Let serializedSlicedLength be slicedBlob’s size, serialized and isomorphic encoded.
const serializedSlicedLength = isomorphicEncode(`${slicedBlob.size}`)
// 12. Let contentRange be the result of invoking build a content range given rangeStart,
// rangeEnd, and fullLength.
const contentRange = buildContentRange(rangeStart, rangeEnd, fullLength)
// 13. Set response’s status to 206.
response.status = 206
// 14. Set response’s status message to `Partial Content`.
response.statusText = 'Partial Content'
// 15. Set response’s header list to « (`Content-Length`, serializedSlicedLength),
// (`Content-Type`, type), (`Content-Range`, contentRange) ».
response.headersList.set('content-length', serializedSlicedLength, true)
response.headersList.set('content-type', type, true)
response.headersList.set('content-range', contentRange, true)
}
// 10. Return response.
return Promise.resolve(response)
}
case 'data:': {
// 1. Let dataURLStruct be the result of running the
// data: URL processor on request’s current URL.
const currentURL = requestCurrentURL(request)
const dataURLStruct = dataURLProcessor(currentURL)
// 2. If dataURLStruct is failure, then return a
// network error.
if (dataURLStruct === 'failure') {
return Promise.resolve(makeNetworkError('failed to fetch the data URL'))
}
// 3. Let mimeType be dataURLStruct’s MIME type, serialized.
const mimeType = serializeAMimeType(dataURLStruct.mimeType)
// 4. Return a response whose status message is `OK`,
// header list is « (`Content-Type`, mimeType) »,
// and body is dataURLStruct’s body as a body.
return Promise.resolve(makeResponse({
statusText: 'OK',
headersList: [
['content-type', { name: 'Content-Type', value: mimeType }]
],
body: safelyExtractBody(dataURLStruct.body)[0]
}))
}
case 'file:': {
// For now, unfortunate as it is, file URLs are left as an exercise for the reader.
// When in doubt, return a network error.
return Promise.resolve(makeNetworkError('not implemented... yet...'))
}
case 'http:':
case 'https:': {
// Return the result of running HTTP fetch given fetchParams.
return httpFetch(fetchParams)
.catch((err) => makeNetworkError(err))
}
default: {
return Promise.resolve(makeNetworkError('unknown scheme'))
}
}
}
// https://fetch.spec.whatwg.org/#finalize-response
function finalizeResponse (fetchParams, response) {
// 1. Set fetchParams’s request’s done flag.
fetchParams.request.done = true
// 2, If fetchParams’s process response done is not null, then queue a fetch
// task to run fetchParams’s process response done given response, with
// fetchParams’s task destination.
if (fetchParams.processResponseDone != null) {
queueMicrotask(() => fetchParams.processResponseDone(response))
}
}
// https://fetch.spec.whatwg.org/#fetch-finale
function fetchFinale (fetchParams, response) {
// 1. Let timingInfo be fetchParams’s timing info.
let timingInfo = fetchParams.timingInfo
// 2. If response is not a network error and fetchParams’s request’s client is a secure context,
// then set timingInfo’s server-timing headers to the result of getting, decoding, and splitting
// `Server-Timing` from response’s internal response’s header list.
// TODO
// 3. Let processResponseEndOfBody be the following steps:
const processResponseEndOfBody = () => {
// 1. Let unsafeEndTime be the unsafe shared current time.
const unsafeEndTime = Date.now() // ?
// 2. If fetchParams’s request’s destination is "document", then set fetchParams’s controller’s
// full timing info to fetchParams’s timing info.
if (fetchParams.request.destination === 'document') {
fetchParams.controller.fullTimingInfo = timingInfo
}
// 3. Set fetchParams’s controller’s report timing steps to the following steps given a global object global:
fetchParams.controller.reportTimingSteps = () => {
// 1. If fetchParams’s request’s URL’s scheme is not an HTTP(S) scheme, then return.