feat(provider): Add Azure Active Directory B2C (nextauthjs#809)

* add provider: Microsoft

* documentation

* support no tenant setup

* fix code style

* chore: rename Microsoft provider to AzureADB2C

* chore: alphabetical order in providers/index

src/providers/azure-ad-b2c.js

@@ -0,0 +1,24 @@
+export default (options) => {
+  const tenant = options.tenantId ? options.tenantId : 'common'
+
+  return {
+    id: 'azure-ad-b2c',
+    name: 'Azure Active Directory B2C',
+    type: 'oauth',
+    version: '2.0',
+    params: {
+      grant_type: 'authorization_code'
+    },
+    accessTokenUrl: `https://login.microsoftonline.com/${tenant}/oauth2/v2.0/token`,
+    authorizationUrl: `https://login.microsoftonline.com/${tenant}/oauth2/v2.0/authorize?response_type=code&response_mode=query`,
+    profileUrl: 'https://graph.microsoft.com/v1.0/me/',
+    profile: (profile) => {
+      return {
+        id: profile.id,
+        name: profile.displayName,
+        email: profile.userPrincipalName
+      }
+    },
+    ...options
+  }
+}

src/providers/index.js

@@ -1,6 +1,7 @@
 import Apple from './apple'
 import Atlassian from './atlassian'
 import Auth0 from './auth0'
+import AzureADB2C from './azure-ad-b2c'
 import Basecamp from './basecamp'
 import BattleNet from './battlenet'
 import Box from './box'
@@ -27,6 +28,7 @@ export default {
   Atlassian,
   Auth0,
   Apple,
+  AzureADB2C,
   Basecamp,
   BattleNet,
   Box,

www/docs/configuration/providers.md

@@ -14,6 +14,7 @@ NextAuth.js is designed to work with any OAuth service, it supports OAuth 1.0, 1
 * [Apple](/providers/apple)
 * [Atlassian](/providers/atlassian)
 * [Auth0](/providers/auth0)
+* [Azure Active Directory B2C](/providers/azure-ad-b2c)
 * [Basecamp](/providers/basecamp)
 * [Battle.net](/providers/battlenet)
 * [Box](/providers/box)

www/docs/faq.md

@@ -23,7 +23,7 @@ You can use also NextAuth.js with any database using a custom database adapter,
 
 ### What authentication services does NextAuth.js support?
 
-NextAuth.js includes built-in support for signing in with Apple, Atlassian, Auth0, Google, Battle.net, Box, AWS Cognito, Discord, Facebook, FusionAuth, GitHub, GitLab, Google, Open ID Identity Server, Mixer, Okta, Slack, Spotify, Twitch, Twitter and Yandex.
+NextAuth.js includes built-in support for signing in with Apple, Atlassian, Auth0, Azure Active Directory B2C, Google, Battle.net, Box, AWS Cognito, Discord, Facebook, FusionAuth, GitHub, GitLab, Google, Open ID Identity Server, Mixer, Okta, Slack, Spotify, Twitch, Twitter and Yandex.
 
 NextAuth.js also supports email for passwordless sign in, which is useful for account recovery or for people who are not able to use an account with the configured OAuth services (e.g. due to service outage, account suspension or otherwise becoming locked out of an account).
 

www/docs/providers/azure-ad-b2c.md

@@ -0,0 +1,28 @@
+---
+id: azure-ad-b2c
+title: Azure Active Directory B2C
+---
+
+## Documentation
+
+https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-auth-code-flow
+
+## Configuration
+
+https://docs.microsoft.com/en-us/azure/active-directory-b2c/tutorial-create-tenant
+
+## Example
+
+```js
+import Providers from 'next-auth/providers';
+...
+providers: [
+  Providers.AzureADB2C({
+    clientId: process.env.AZURE_CLIENT_ID,
+    clientSecret: process.env.AZURE_CLIENT_SECRET,
+    scope: 'offline_access User.Read',
+    tenantId: process.env.AZURE_TENANT_ID,
+  }),
+]
+...
+```

www/sidebars.js

@@ -26,6 +26,7 @@ module.exports = {
       'providers/apple',
       'providers/atlassian',
       'providers/auth0',
+      'providers/azure-ad-b2c',
       'providers/basecamp',
       'providers/battle.net',
       'providers/box',