feat: add foursquare (#584)

src/providers/foursquare.js

@@ -0,0 +1,22 @@
+export default ({ apiVersion, ...options }) => {
+  return {
+    id: 'foursquare',
+    name: 'Foursquare',
+    type: 'oauth',
+    version: '2.0',
+    params: { grant_type: 'authorization_code' },
+    accessTokenUrl: 'https://foursquare.com/oauth2/access_token',
+    authorizationUrl:
+      'https://foursquare.com/oauth2/authenticate?response_type=code',
+    profileUrl: `https://api.foursquare.com/v2/users/self?v=${apiVersion}`,
+    profile: (profile) => {
+      return {
+        id: profile.id,
+        name: `${profile.firstName} ${profile.lastName}`,
+        image: `${profile.prefix}original${profile.suffix}`,
+        email: profile.contact.email
+      }
+    },
+    ...options
+  }
+}

src/providers/index.js

@@ -10,6 +10,7 @@ import Cognito from './cognito'
 import Discord from './discord'
 import Email from './email'
 import Facebook from './facebook'
+import Foursquare from './foursquare'
 import FusionAuth from './fusionauth'
 import GitHub from './github'
 import GitLab from './gitlab'
@@ -38,6 +39,7 @@ export default {
   Discord,
   Email,
   Facebook,
+  Foursquare,
   FusionAuth,
   GitHub,
   GitLab,

www/docs/configuration/providers.md

@@ -20,6 +20,7 @@ NextAuth.js is designed to work with any OAuth service, it supports OAuth 1.0, 1
 * [Amazon Cognito](/providers/cognito)
 * [Discord](/providers/discord)
 * [Facebook](/providers/facebook)
+* [Foursquare](/providers/foursquare)
 * [FusionAuth](/providers/fusionauth)
 * [GitHub](/providers/github)
 * [GitLab](/providers/gitlab)
@@ -104,7 +105,7 @@ As an example of what this looks like, this is the the provider object returned
   clientSecret: ''
 }
 ```
-You can replace all the options in this JSON object with the ones from your custom provider – be sure to give it a unique ID and specify the correct OAuth version - and add it to the providers option:
+You can replace all the options in this JSON object with the ones from your custom provider – be sure to give it a unique ID and specify the correct OAuth version - and add it to the providers option:
 
 ```js title="pages/api/auth/[...nextauth].js"
 ...

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, Netlify, Okta, Slack, Spotify, Twitch, Twitter and Yandex.
+NextAuth.js includes built-in support for signing in with Apple, Atlassian, Auth0, Google, Battle.net, Box, AWS Cognito, Discord, Facebook, Foursquare, FusionAuth, GitHub, GitLab, Google, Open ID Identity Server, Mixer, Netlify, 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/foursquare.md

@@ -0,0 +1,30 @@
+---
+id: foursquare
+title: Foursquare
+---
+
+## Documentation
+
+https://developer.foursquare.com/docs/places-api/authentication/#web-applications
+
+## Configuration
+
+https://developer.foursquare.com/
+
+:::warning
+Foursquare requires an additional `apiVersion` parameter in [`YYYYMMDD` format](https://developer.foursquare.com/docs/places-api/versioning/), which essentially states "I'm prepared for API changes up to this date".
+
+## Example
+
+```js
+import Providers from `next-auth/providers`
+...
+providers: [
+  Providers.Foursquare({
+    clientId: process.env.FOURSQUARE_CLIENT_ID,
+    clientSecret: process.env.FOURSQUARE_CLIENT_SECRET,
+    apiVersion: 'YYYYMMDD'
+  })
+}
+...
+```