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100 lines
3.7 KiB
100 lines
3.7 KiB
'use strict'
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const { FetchError, Request, isRedirect } = require('minipass-fetch')
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const url = require('url')
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const CachePolicy = require('./cache/policy.js')
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const cache = require('./cache/index.js')
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const remote = require('./remote.js')
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// given a Request, a Response and user options
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// return true if the response is a redirect that
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// can be followed. we throw errors that will result
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// in the fetch being rejected if the redirect is
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// possible but invalid for some reason
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const canFollowRedirect = (request, response, options) => {
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if (!isRedirect(response.status))
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return false
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if (options.redirect === 'manual')
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return false
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if (options.redirect === 'error')
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throw new FetchError(`redirect mode is set to error: ${request.url}`, 'no-redirect', { code: 'ENOREDIRECT' })
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if (!response.headers.has('location'))
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throw new FetchError(`redirect location header missing for: ${request.url}`, 'no-location', { code: 'EINVALIDREDIRECT' })
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if (request.counter >= request.follow)
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throw new FetchError(`maximum redirect reached at: ${request.url}`, 'max-redirect', { code: 'EMAXREDIRECT' })
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return true
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}
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// given a Request, a Response, and the user's options return an object
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// with a new Request and a new options object that will be used for
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// following the redirect
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const getRedirect = (request, response, options) => {
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const _opts = { ...options }
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const location = response.headers.get('location')
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const redirectUrl = new url.URL(location, /^https?:/.test(location) ? undefined : request.url)
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// Comment below is used under the following license:
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// Copyright (c) 2010-2012 Mikeal Rogers
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an "AS
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// IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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// express or implied. See the License for the specific language
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// governing permissions and limitations under the License.
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// Remove authorization if changing hostnames (but not if just
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// changing ports or protocols). This matches the behavior of request:
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// https://github.com/request/request/blob/b12a6245/lib/redirect.js#L134-L138
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if (new url.URL(request.url).hostname !== redirectUrl.hostname)
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request.headers.delete('authorization')
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// for POST request with 301/302 response, or any request with 303 response,
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// use GET when following redirect
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if (response.status === 303 || (request.method === 'POST' && [301, 302].includes(response.status))) {
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_opts.method = 'GET'
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_opts.body = null
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request.headers.delete('content-length')
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}
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_opts.headers = {}
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request.headers.forEach((value, key) => {
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_opts.headers[key] = value
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})
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_opts.counter = ++request.counter
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const redirectReq = new Request(url.format(redirectUrl), _opts)
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return {
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request: redirectReq,
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options: _opts,
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}
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}
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const fetch = async (request, options) => {
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const response = CachePolicy.storable(request, options)
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? await cache(request, options)
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: await remote(request, options)
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// if the request wasn't a GET or HEAD, and the response
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// status is between 200 and 399 inclusive, invalidate the
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// request url
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if (!['GET', 'HEAD'].includes(request.method) &&
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response.status >= 200 &&
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response.status <= 399)
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await cache.invalidate(request, options)
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if (!canFollowRedirect(request, response, options))
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return response
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const redirect = getRedirect(request, response, options)
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return fetch(redirect.request, redirect.options)
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}
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module.exports = fetch
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