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Add proxyCookies option #358

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Add proxyCookies option #358

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1 change: 1 addition & 0 deletions lib/module.js
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ function axiosModule (_moduleOptions) {
progress: true,
proxyHeaders: true,
proxyHeadersIgnore: ['accept', 'host', 'cf-ray', 'cf-connecting-ip', 'content-length', 'content-md5', 'content-type'],
proxyCookies: true,
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@pi0 pi0 May 3, 2020 •
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I would suggest turning off by default because of security implications it has (private SSR API calls may leak headers)

proxy: false,
retry: false,
https,
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72 changes: 72 additions & 0 deletions lib/plugin.js
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@@ -1,6 +1,7 @@
import Axios from 'axios'
import defu from 'defu'
<% if (options.retry) { %>import axiosRetry from 'axios-retry'<% } %>
<% if (options.proxyCookies) { %>import { parse as parseCookies } from 'cookie'<% } %>

const $nuxt = typeof window !== 'undefined' && window['$<%= options.globalName %>']

Expand Down Expand Up @@ -179,6 +180,68 @@ const setupProgress = (axios) => {
axios.defaults.onDownloadProgress = onProgress
}<% } %>

<% if (options.proxyCookies) { %>
const proxyCookies = (ctx, axios, response) => {
const parseSetCookies = cookies => {
return cookies
.map(cookie => cookie.split(';')[0])
.reduce((obj, cookie) => ({
...obj,
...parseCookies(cookie)
}), {})
}

const serializeCookies = cookies => {
return Object
.entries(cookies)
.map(([name, value]) => `${name}=${encodeURIComponent(value)}`)
.join('; ')
}

const mergeSetCookies = (oldCookies, newCookies) => {
const cookies = new Map()

const add = setCookie => {
const cookie = setCookie.split(';')[0]
const name = Object.keys(parseCookies(cookie))[0]

cookies.set(name, cookie)
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It should be cookies.set(name, setCookie).
Otherwise, cookie might be duplicated by HttpOnly/Domain/SameSite/Max-Age/etc parameters.

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For example:
1st row - cookie from backend
2nd row - cookie from ssr-cookie-proxy

image

}

oldCookies.forEach(add)
newCookies.forEach(add)

return [...cookies.values()]
}

const arrayify = obj => Array.isArray(obj) ? obj : [obj]

if (response.headers['set-cookie']) {
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Suggested change
if (response.headers['set-cookie']) {
if (response.headers['set-cookie'] && !response.headersSent) {

We must check headersSent property, or we can get error:

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

const setCookies = arrayify(response.headers['set-cookie'])

// Combine the cookies set on axios with the new cookies and serialize them
const cookie = serializeCookies({
...parseCookies(axios.defaults.headers.common.cookie),
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This line can fail with ERROR argument str must be a string, cause axios.defaults.headers.common.cookie can be undefined

...parseSetCookies(setCookies)
})

axios.defaults.headers.common.cookie = cookie

// If the res already has a Set-Cookie header it should be merged
if (ctx.res.getHeader('Set-Cookie')) {
const newCookies = mergeSetCookies(
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@pi0 pi0 May 3, 2020 •
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It is fine by spec to send multiple Set-Cookie headers and it would be a much smaller implementation. ++ we don't need an external dependency/process to parse and merge cookies

By your comment: If you make multiple requests that all overwrite a certain cookie, that could increase the header size quite a bit

Yes it would but backend shouldn't send multiple Set-Cookies if it does, we should transparently pass them to the client like how it works on client (if each response does a Set-Cookie browser applies separately and in order)

If you are getting this behavior by your implementation, probably reason is during single SSR lifecycle, after we get first Set-Cookie, should pass it to next SSR API-calls :)

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Yes it would but backend shouldn't send multiple Set-Cookies if it does, we should transparently pass them to the client like how it works on client (if each response does a Set-Cookie browser applies separately and in order)

The issue isn't with a single request to the backend sending duplicate Set-Cookie headers, but with multiple separate requests which all receive a cookie.

Consider you have the route /cookie which returns a header Set-Cookie: count=i where i starts at 0 and for each subsequent request count is incremented in the cookie response. The first request you get count=0, second count=1, third count=2. And then the following code.

async asyncData({ $axios }) {
	await $axios.$get('/cookie'); // Set-Cookie: count=0
	await $axios.$get('/cookie'); // Set-Cookie: count=1
	await $axios.$get('/cookie'); // Set-Cookie: count=2
}

When you're in a browser, you'll end up with count=2, because each request is done one at a time.

When you're on the server and the Set-Cookie header isn't merged, the client will receive all the headers at once. It's then left up to the browser to set the correct cookie, which should be the last one, but that can't be guaranteed. I'm also not certain if Node guarantees the headers to be sent in the same order.

Set-Cookie: count=0
Set-Cookie: count=1
Set-Cookie: count=2

If the Set-Cookie headers are merged, you end up with the following response, and the browser should end up with the correct cookie.

Set-Cookie: count=2

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I know what you mean :) but it comes with the cost of much more parse/seralize logic and a library import and Something like a Set-Cookie: count should not honestly happen by the backend. Also, request ordering may affect which Set-Cookie finally takes over and it is hidden by the client then.

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If you're fine with edge cases not being covered that's fine by me. I think in most cases there won't be any issues if Set-Cookie headers aren't merged.

The cookie library is also used to parse the cookies and store them on the Axios instance. This is necessary when dealing, for example, with access tokens that get refreshed after a request, and the next request requires the new token.

Ideally, all this logic is only included in the server-side bundle, but I don't know whether that is possible here.

arrayify(ctx.res.getHeader('Set-Cookie')),
setCookies
)

ctx.res.setHeader('Set-Cookie', newCookies)
} else {
ctx.res.setHeader('Set-Cookie', setCookies)
}
}
}
<% } %>

export default (ctx, inject) => {
// baseURL
const baseURL = process.browser
Expand Down Expand Up @@ -213,6 +276,15 @@ export default (ctx, inject) => {

const axios = createAxiosInstance(axiosOptions)

<% if (options.proxyCookies) { %>
// Proxy cookies
if (process.server) {
axios.onResponse(response => {
proxyCookies(ctx, axios, response)
})
}
<% } %>

// Inject axios to the context as $axios
ctx.$axios = axios
inject('axios', axios)
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1 change: 1 addition & 0 deletions package.json
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Expand Up @@ -27,6 +27,7 @@
"axios": "^0.19.2",
"axios-retry": "^3.1.8",
"consola": "^2.11.3",
"cookie": "^0.4.1",
"defu": "^2.0.2"
},
"devDependencies": {
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5 changes: 5 additions & 0 deletions yarn.lock
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Expand Up @@ -3289,6 +3289,11 @@ cookie@^0.3.1:
resolved "https://registry.yarnpkg.com/cookie/-/cookie-0.3.1.tgz#e7e0a1f9ef43b4c8ba925c5c5a96e806d16873bb"
integrity sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=

cookie@^0.4.1:
version "0.4.1"
resolved "https://registry.yarnpkg.com/cookie/-/cookie-0.4.1.tgz#afd713fe26ebd21ba95ceb61f9a8116e50a537d1"
integrity sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA==

copy-concurrently@^1.0.0:
version "1.0.5"
resolved "https://registry.yarnpkg.com/copy-concurrently/-/copy-concurrently-1.0.5.tgz#92297398cae34937fcafd6ec8139c18051f0b5e0"
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