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'use strict'
var url = require('url')
var isUrl = /^https?:/
function Redirect (request) {
this.request = request
this.followRedirect = true
this.followRedirects = true
this.followAllRedirects = false
this.followOriginalHttpMethod = false
this.allowRedirect = function () { return true }
this.maxRedirects = 10
this.redirects = []
this.redirectsFollowed = 0
this.removeRefererHeader = false
}
Redirect.prototype.onRequest = function (options) {
var self = this
if (options.maxRedirects !== undefined) {
self.maxRedirects = options.maxRedirects
}
if (typeof options.followRedirect === 'function') {
self.allowRedirect = options.followRedirect
}
if (options.followRedirect !== undefined) {
self.followRedirects = !!options.followRedirect
}
if (options.followAllRedirects !== undefined) {
self.followAllRedirects = options.followAllRedirects
}
if (self.followRedirects || self.followAllRedirects) {
self.redirects = self.redirects || []
}
if (options.removeRefererHeader !== undefined) {
self.removeRefererHeader = options.removeRefererHeader
}
if (options.followOriginalHttpMethod !== undefined) {
self.followOriginalHttpMethod = options.followOriginalHttpMethod
}
}
Redirect.prototype.redirectTo = function (response) {
var self = this
var request = self.request
var redirectTo = null
if (response.statusCode >= 300 && response.statusCode < 400 && response.caseless.has('location')) {
var location = response.caseless.get('location')
request.debug('redirect', location)
if (self.followAllRedirects) {
redirectTo = location
} else if (self.followRedirects) {
switch (request.method) {
case 'PATCH':
case 'PUT':
case 'POST':
case 'DELETE':
// Do not follow redirects
break
default:
redirectTo = location
break
}
}
} else if (response.statusCode === 401) {
var authHeader = request._auth.onResponse(response)
if (authHeader) {
request.setHeader('authorization', authHeader)
redirectTo = request.uri
}
}
return redirectTo
}
Redirect.prototype.onResponse = function (response) {
var self = this
var request = self.request
var redirectTo = self.redirectTo(response)
if (!redirectTo || !self.allowRedirect.call(request, response)) {
return false
}
request.debug('redirect to', redirectTo)
// ignore any potential response body. it cannot possibly be useful
// to us at this point.
// response.resume should be defined, but check anyway before calling. Workaround for browserify.
if (response.resume) {
response.resume()
}
if (self.redirectsFollowed >= self.maxRedirects) {
request.emit('error', new Error('Exceeded maxRedirects. Probably stuck in a redirect loop ' + request.uri.href))
return false
}
self.redirectsFollowed += 1
if (!isUrl.test(redirectTo)) {
redirectTo = url.resolve(request.uri.href, redirectTo)
}
var uriPrev = request.uri
request.uri = url.parse(redirectTo)
// handle the case where we change protocol from https to http or vice versa
if (request.uri.protocol !== uriPrev.protocol) {
delete request.agent
}
self.redirects.push({ statusCode: response.statusCode, redirectUri: redirectTo })
if (self.followAllRedirects && request.method !== 'HEAD' &&
response.statusCode !== 401 && response.statusCode !== 307) {
request.method = self.followOriginalHttpMethod ? request.method : 'GET'
}
// request.method = 'GET' // Force all redirects to use GET || commented out fixes #215
delete request.src
delete request.req
delete request._started
if (response.statusCode !== 401 && response.statusCode !== 307) {
// Remove parameters from the previous response, unless this is the second request
// for a server that requires digest authentication.
delete request.body
delete request._form
if (request.headers) {
request.removeHeader('host')
request.removeHeader('content-type')
request.removeHeader('content-length')
if (request.uri.hostname !== request.originalHost.split(':')[0]) {
// Remove authorization if changing hostnames (but not if just
// changing ports or protocols). This matches the behavior of curl:
// https://github.com/bagder/curl/blob/6beb0eee/lib/http.c#L710
request.removeHeader('authorization')
}
}
}
if (!self.removeRefererHeader) {
request.setHeader('referer', uriPrev.href)
}
request.emit('redirect')
request.init()
return true
}
exports.Redirect = Redirect
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