feat(provider): accept array for protection to support multiple mechanisms (nextauthjs#1565)

* fix: add protection both option

* feat: update docs with new protection value

* fix: lint files

* refactor: change protection from string to array

* chore: reverting unespected change

* chore: lint files

Co-authored-by: Balázs Orbán <[email protected]>

Author: viniciuscr

src/server/lib/oauth/client.js

@@ -136,7 +136,7 @@ async function getOAuth2AccessToken (code, provider, codeVerifier) {
     headers.Authorization = `Bearer ${code}`
   }
 
-  if (provider.protection === 'pkce') {
+  if ([provider.protection].flat().includes('pkce')) {
     params.code_verifier = codeVerifier
   }
 

src/server/lib/oauth/pkce-handler.js

@@ -16,7 +16,7 @@ const PKCE_MAX_AGE = 60 * 15 // 15 minutes in seconds
 export async function handleCallback (req, res) {
   const { cookies, provider, baseUrl, basePath } = req.options
   try {
-    if (provider.protection !== 'pkce') { // Provider does not support PKCE, nothing to do.
+    if (![provider.protection].flat().includes('pkce')) { // Provider does not support PKCE, nothing to do.
       return
     }
 
@@ -50,7 +50,7 @@ export async function handleCallback (req, res) {
 export async function handleSignin (req, res) {
   const { cookies, provider, baseUrl, basePath } = req.options
   try {
-    if (provider.protection !== 'pkce') { // Provider does not support PKCE, nothing to do.
+    if (![provider.protection].flat().includes('pkce')) { // Provider does not support PKCE, nothing to do.
       return
     }
     // Started login flow, add generated pkce to req.options and (encrypted) code_verifier to a cookie

src/server/lib/oauth/state-handler.js

@@ -12,7 +12,7 @@ import { OAuthCallbackError } from '../../../lib/errors'
 export async function handleCallback (req, res) {
   const { csrfToken, provider, baseUrl, basePath } = req.options
   try {
-    if (provider.protection !== 'state') { // Provider does not support state, nothing to do.
+    if (![provider.protection].flat().includes('state')) { // Provider does not support state, nothing to do.
       return
     }
 
@@ -41,7 +41,7 @@ export async function handleCallback (req, res) {
 export async function handleSignin (req, res) {
   const { provider, baseUrl, basePath, csrfToken } = req.options
   try {
-    if (provider.protection !== 'state') { // Provider does not support state, nothing to do.
+    if (![provider.protection].flat().includes('state')) { // Provider does not support state, nothing to do.
       return
     }
 

www/docs/configuration/providers.md

@@ -141,7 +141,7 @@ You can look at the existing built-in providers for inspiration.
 |       profile       |       An callback returning an object with the user's info       |            `object`             |    No    |
 |       idToken       |   Set to `true` for services that use ID Tokens (e.g. OpenID)    |            `boolean`            |    No    |
 |       headers       |      Any headers that should be sent to the OAuth provider       |            `object`             |    No    |
-|     protection      | Additional security for OAuth login flows (defaults to `state`)  |     `pkce`, `state`, `none`     |    No    |
+|     protection      | Additional security for OAuth login flows (defaults to `state`)  |`[pkce]`,`[state]`,`[pkce,state]`|    No    |
 |        state        | Same as `protection: "state"`. Being deprecated, use protection. |            `boolean`            |    No    |
 
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