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+- Start Date: 14/09/2020
+- RFC PR: _Work in progress_
+
+# Summary
+
+Implement new authentication provider : Apple SignIn
+
+Apple mandatoring to add his own authentication system (Apple SignIn) if one other provider is use on an application (Facebook, Google, Twitter, Instagram...).
+A lot of us use Strapi as an API with a mobile application (developed with Flutter, React, Expo, Swift, Kotlin, ...).
+
+Today, Strapi is not provide a full documentation with configuration process for Apple SignIn.
+
+The main idea of this RFC is to provide an authentication process with Apple SignIn in order to help all user to implement it quickly.
+
+The second idea is to provide a simple process to configure Apple provider like others.
+
+# Example
+
+We need to change a couple of file, because Apple SignIn is a mixed with oAuth2 and OpenID authentication process.
+
+### 1. Add Apple Grant main configuration
+
+File `strapi-plugin-users-permissions/config/functions/bootstrap.js`
+```javascript
+...
+apple: {
+      enabled: false,
+      icon: 'apple',
+      key: '',
+      secret: '', // First difficulty, the "secret" is a generated JWT token than need to be recreate usually
+      callback: `${strapi.config.server.url}/auth/apple/callback`,
+      scope: ['name', 'email'], // basic scope, but need to send a POST request
+      nonce: true,
+      state: true,
+      custom_params: {
+        response_type: 'code id_token',
+        response_mode: 'form_post' // Force Grant to perform a POST response
+      }
+    },
+...
+```
+
+### 2. Add a `POST` routes to received callback response from Apple (copy of GET)
+
+File `strapi-plugin-users-permissions/config/routes.json`
+
+```json
+{
+      "method": "POST",
+      "path": "/connect/*",
+      "handler": "Auth.connect",
+      "config": {
+        "policies": ["plugins::users-permissions.ratelimit"],
+        "prefix": "",
+        "description": "Connect a provider",
+        "tag": {
+          "plugin": "users-permissions",
+          "name": "User"
+        }
+      }
+    },
+```
+
+### Add Apple provider API call in `providers` services :
+
+
+File `strapi-plugin-users-permissions/services/providers.js`
+```javascript
+...
+const jwt = require('jsonwebtoken'); // require jwt decode
+...
+// /!\ DRAFT /!\ 
+case 'apple': {
+      const apple = purest({
+        provider: 'apple',
+        config: {
+          apple: {
+            'https://appleid.apple.com': {
+              __domain: {
+                auth: {
+                  auth: { bearer: '[0]' },
+                },
+              },
+              '{endpoint}': {
+                __path: {
+                  alias: '__default',
+                },
+              },
+            },
+          },
+        }
+      });
+      apple
+        .query()
+        .post('auth/token') // Apple want receive only post request
+        .auth(access_token)
+        .request((err, res, body) => {
+          if (err) {
+            callback(err);
+          } else {
+            const idToken = jwt.decode(body.id_token);
+            callback(null, {
+              username: idToken.email.split('@')[0],
+              email: idToken.email,
+            });
+          }
+        });
+      break;
+    }
+```
+
+This part is a draft.
+
+`Purest` has not been update since 4 years, many new providers are not available (like `discord` actually).
+It's a sample config for Apple than want receive a Bearer access token.
+
+Maybe it will be necessary to implement other library than `Purest`.
+
+# Motivation
+
+This feature is wanted by many users, and difficult to implement for now.
+I've worked during a complete week in order to aggregate the most documentation as possible and help other to quickly implement this new provider on Strapi.
+
+I wrote an issue to Simov/Grant  in order to have an example of implementation with the configuration above :
+- [https://github.com/simov/grant/issues/193](https://github.com/simov/grant/issues/193)
+
+I'm sure we can add it to Strapi, but with some modification on the plugin `strapi-plugin-users-permissions` :
+- Find `Purest` configuration or used a new library (describe below) ?
+- Perform GET/POST callback request with `access_token` readable
+- Implement a 'generate token' system (except if Grant manage this part already ?)
+- Manage private key `.p8` file to generate token for Apple authentication token ?
+
+# Detailed design
+
+None
+
+# Tradeoffs
+
+What potential tradeoffs are involved with this proposal.
+
+- Complexity 
+    * Medium
+
+- Work load of implementation 
+    * Development of this feature : 3 days with all information
+    * Number of people need to test : min. 3
+
+- Can this be implemented outside of Strapi's core packages
+    - No, this need to be implemented into `strapi-plugin-users-permissions`, so people need to copy in `extensions` folder many files in order to have Apple SignIn.
+
+- How does this proposal integrate with the current features being implemented
+    - See example explained above
+
+- Cost of migrating existing Strapi applications (is it a breaking change?)
+    - No, we can add this feature and keep all other providers working well
+
+- Does implementing this proposal mean reworking teaching resources (videos, tutorials, documentations)?
+    - This provider require to write a complete documentation (but I've already done this part)
+
+# Alternatives
+
+Two main `node.js` package implement apple sign-in :
+- [https://www.npmjs.com/package/apple-signin](https://www.npmjs.com/package/apple-signin)
+- [https://www.npmjs.com/package/apple-auth](https://www.npmjs.com/package/apple-auth)
+
+This is almost working, if we eject `Purest` and keep only `Grant`.
+I've a working example available (private project, ask me to access on Slack).
+
+# Unresolved questions