365 lines
12 KiB
JavaScript
365 lines
12 KiB
JavaScript
'use strict'
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const { URL } = require('url')
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const http = require('http')
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const https = require('https')
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const zlib = require('minizlib')
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const Minipass = require('minipass')
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const Body = require('./body.js')
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const { writeToStream, getTotalBytes } = Body
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const Response = require('./response.js')
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const Headers = require('./headers.js')
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const { createHeadersLenient } = Headers
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const Request = require('./request.js')
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const { getNodeRequestOptions } = Request
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const FetchError = require('./fetch-error.js')
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const AbortError = require('./abort-error.js')
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// XXX this should really be split up and unit-ized for easier testing
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// and better DRY implementation of data/http request aborting
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const fetch = async (url, opts) => {
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if (/^data:/.test(url)) {
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const request = new Request(url, opts)
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// delay 1 promise tick so that the consumer can abort right away
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return Promise.resolve().then(() => new Promise((resolve, reject) => {
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let type, data
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try {
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const { pathname, search } = new URL(url)
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const split = pathname.split(',')
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if (split.length < 2) {
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throw new Error('invalid data: URI')
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}
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const mime = split.shift()
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const base64 = /;base64$/.test(mime)
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type = base64 ? mime.slice(0, -1 * ';base64'.length) : mime
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const rawData = decodeURIComponent(split.join(',') + search)
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data = base64 ? Buffer.from(rawData, 'base64') : Buffer.from(rawData)
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} catch (er) {
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return reject(new FetchError(`[${request.method}] ${
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request.url} invalid URL, ${er.message}`, 'system', er))
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}
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const { signal } = request
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if (signal && signal.aborted) {
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return reject(new AbortError('The user aborted a request.'))
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}
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const headers = { 'Content-Length': data.length }
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if (type) {
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headers['Content-Type'] = type
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}
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return resolve(new Response(data, { headers }))
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}))
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}
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return new Promise((resolve, reject) => {
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// build request object
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const request = new Request(url, opts)
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let options
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try {
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options = getNodeRequestOptions(request)
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} catch (er) {
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return reject(er)
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}
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const send = (options.protocol === 'https:' ? https : http).request
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const { signal } = request
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let response = null
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const abort = () => {
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const error = new AbortError('The user aborted a request.')
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reject(error)
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if (Minipass.isStream(request.body) &&
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typeof request.body.destroy === 'function') {
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request.body.destroy(error)
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}
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if (response && response.body) {
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response.body.emit('error', error)
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}
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}
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if (signal && signal.aborted) {
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return abort()
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}
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const abortAndFinalize = () => {
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abort()
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finalize()
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}
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const finalize = () => {
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req.abort()
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if (signal) {
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signal.removeEventListener('abort', abortAndFinalize)
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}
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clearTimeout(reqTimeout)
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}
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// send request
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const req = send(options)
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if (signal) {
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signal.addEventListener('abort', abortAndFinalize)
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}
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let reqTimeout = null
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if (request.timeout) {
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req.once('socket', socket => {
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reqTimeout = setTimeout(() => {
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reject(new FetchError(`network timeout at: ${
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request.url}`, 'request-timeout'))
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finalize()
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}, request.timeout)
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})
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}
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req.on('error', er => {
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// if a 'response' event is emitted before the 'error' event, then by the
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// time this handler is run it's too late to reject the Promise for the
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// response. instead, we forward the error event to the response stream
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// so that the error will surface to the user when they try to consume
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// the body. this is done as a side effect of aborting the request except
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// for in windows, where we must forward the event manually, otherwise
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// there is no longer a ref'd socket attached to the request and the
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// stream never ends so the event loop runs out of work and the process
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// exits without warning.
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// coverage skipped here due to the difficulty in testing
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// istanbul ignore next
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if (req.res) {
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req.res.emit('error', er)
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}
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reject(new FetchError(`request to ${request.url} failed, reason: ${
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er.message}`, 'system', er))
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finalize()
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})
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req.on('response', res => {
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clearTimeout(reqTimeout)
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const headers = createHeadersLenient(res.headers)
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// HTTP fetch step 5
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if (fetch.isRedirect(res.statusCode)) {
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// HTTP fetch step 5.2
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const location = headers.get('Location')
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// HTTP fetch step 5.3
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const locationURL = location === null ? null
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: (new URL(location, request.url)).toString()
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// HTTP fetch step 5.5
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if (request.redirect === 'error') {
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reject(new FetchError('uri requested responds with a redirect, ' +
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`redirect mode is set to error: ${request.url}`, 'no-redirect'))
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finalize()
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return
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} else if (request.redirect === 'manual') {
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// node-fetch-specific step: make manual redirect a bit easier to
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// use by setting the Location header value to the resolved URL.
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if (locationURL !== null) {
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// handle corrupted header
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try {
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headers.set('Location', locationURL)
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} catch (err) {
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/* istanbul ignore next: nodejs server prevent invalid
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response headers, we can't test this through normal
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request */
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reject(err)
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}
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}
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} else if (request.redirect === 'follow' && locationURL !== null) {
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// HTTP-redirect fetch step 5
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if (request.counter >= request.follow) {
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reject(new FetchError(`maximum redirect reached at: ${
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request.url}`, 'max-redirect'))
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finalize()
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return
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}
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// HTTP-redirect fetch step 9
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if (res.statusCode !== 303 &&
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request.body &&
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getTotalBytes(request) === null) {
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reject(new FetchError(
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'Cannot follow redirect with body being a readable stream',
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'unsupported-redirect'
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))
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finalize()
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return
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}
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// Update host due to redirection
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request.headers.set('host', (new URL(locationURL)).host)
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// HTTP-redirect fetch step 6 (counter increment)
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// Create a new Request object.
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const requestOpts = {
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headers: new Headers(request.headers),
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follow: request.follow,
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counter: request.counter + 1,
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agent: request.agent,
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compress: request.compress,
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method: request.method,
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body: request.body,
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signal: request.signal,
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timeout: request.timeout,
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}
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// if the redirect is to a new hostname, strip the authorization and cookie headers
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const parsedOriginal = new URL(request.url)
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const parsedRedirect = new URL(locationURL)
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if (parsedOriginal.hostname !== parsedRedirect.hostname) {
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requestOpts.headers.delete('authorization')
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requestOpts.headers.delete('cookie')
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}
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// HTTP-redirect fetch step 11
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if (res.statusCode === 303 || (
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(res.statusCode === 301 || res.statusCode === 302) &&
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request.method === 'POST'
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)) {
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requestOpts.method = 'GET'
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requestOpts.body = undefined
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requestOpts.headers.delete('content-length')
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}
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// HTTP-redirect fetch step 15
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resolve(fetch(new Request(locationURL, requestOpts)))
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finalize()
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return
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}
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} // end if(isRedirect)
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// prepare response
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res.once('end', () =>
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signal && signal.removeEventListener('abort', abortAndFinalize))
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const body = new Minipass()
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// if an error occurs, either on the response stream itself, on one of the
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// decoder streams, or a response length timeout from the Body class, we
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// forward the error through to our internal body stream. If we see an
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// error event on that, we call finalize to abort the request and ensure
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// we don't leave a socket believing a request is in flight.
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// this is difficult to test, so lacks specific coverage.
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body.on('error', finalize)
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// exceedingly rare that the stream would have an error,
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// but just in case we proxy it to the stream in use.
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res.on('error', /* istanbul ignore next */ er => body.emit('error', er))
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res.on('data', (chunk) => body.write(chunk))
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res.on('end', () => body.end())
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const responseOptions = {
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url: request.url,
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status: res.statusCode,
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statusText: res.statusMessage,
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headers: headers,
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size: request.size,
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timeout: request.timeout,
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counter: request.counter,
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trailer: new Promise(resolveTrailer =>
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res.on('end', () => resolveTrailer(createHeadersLenient(res.trailers)))),
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}
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// HTTP-network fetch step 12.1.1.3
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const codings = headers.get('Content-Encoding')
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// HTTP-network fetch step 12.1.1.4: handle content codings
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// in following scenarios we ignore compression support
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// 1. compression support is disabled
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// 2. HEAD request
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// 3. no Content-Encoding header
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// 4. no content response (204)
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// 5. content not modified response (304)
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if (!request.compress ||
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request.method === 'HEAD' ||
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codings === null ||
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res.statusCode === 204 ||
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res.statusCode === 304) {
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response = new Response(body, responseOptions)
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resolve(response)
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return
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}
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// Be less strict when decoding compressed responses, since sometimes
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// servers send slightly invalid responses that are still accepted
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// by common browsers.
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// Always using Z_SYNC_FLUSH is what cURL does.
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const zlibOptions = {
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flush: zlib.constants.Z_SYNC_FLUSH,
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finishFlush: zlib.constants.Z_SYNC_FLUSH,
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}
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// for gzip
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if (codings === 'gzip' || codings === 'x-gzip') {
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const unzip = new zlib.Gunzip(zlibOptions)
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response = new Response(
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// exceedingly rare that the stream would have an error,
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// but just in case we proxy it to the stream in use.
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body.on('error', /* istanbul ignore next */ er => unzip.emit('error', er)).pipe(unzip),
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responseOptions
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)
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resolve(response)
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return
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}
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// for deflate
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if (codings === 'deflate' || codings === 'x-deflate') {
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// handle the infamous raw deflate response from old servers
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// a hack for old IIS and Apache servers
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const raw = res.pipe(new Minipass())
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raw.once('data', chunk => {
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// see http://stackoverflow.com/questions/37519828
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const decoder = (chunk[0] & 0x0F) === 0x08
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? new zlib.Inflate()
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: new zlib.InflateRaw()
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// exceedingly rare that the stream would have an error,
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// but just in case we proxy it to the stream in use.
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body.on('error', /* istanbul ignore next */ er => decoder.emit('error', er)).pipe(decoder)
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response = new Response(decoder, responseOptions)
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resolve(response)
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})
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return
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}
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// for br
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if (codings === 'br') {
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// ignoring coverage so tests don't have to fake support (or lack of) for brotli
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// istanbul ignore next
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try {
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var decoder = new zlib.BrotliDecompress()
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} catch (err) {
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reject(err)
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finalize()
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return
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}
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// exceedingly rare that the stream would have an error,
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// but just in case we proxy it to the stream in use.
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body.on('error', /* istanbul ignore next */ er => decoder.emit('error', er)).pipe(decoder)
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response = new Response(decoder, responseOptions)
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resolve(response)
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return
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}
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// otherwise, use response as-is
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response = new Response(body, responseOptions)
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resolve(response)
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})
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writeToStream(req, request)
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})
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}
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module.exports = fetch
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fetch.isRedirect = code =>
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code === 301 ||
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code === 302 ||
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code === 303 ||
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code === 307 ||
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code === 308
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fetch.Headers = Headers
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fetch.Request = Request
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fetch.Response = Response
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fetch.FetchError = FetchError
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fetch.AbortError = AbortError
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