Add script to generate Apple SSO client Secret

package.json

@@ -70,6 +70,7 @@
     "lint": "prettier --check \"packages/**/*.{ts,tsx}\"",
     "local": "npm run dev-docker && cross-env VITE_LOCAL_BUILD=true LOCAL=true concurrently -n agones,server,worldserver,mediaserver,client npm:dev-agones-silent \"cd packages/server && npm run start\" \"cd packages/instanceserver && npm run start\" \"cd packages/instanceserver && npm run start-channel\" \"cd packages/client && npm run local\"",
     "make-user-admin": "cross-env ts-node --swc scripts/make-user-admin.ts",
+    "generate-apple-client-secret": "cross-env ts-node --swc scripts/generate-apple-client-secret.ts",
     "migrate": "cd packages/server-core && npm run migrate",
     "migrate:rollback": "cd packages/server-core && npm run migrate:rollback",
     "migrate:unlock": "cd packages/server-core && npm run migrate:unlock",

scripts/generate-apple-client-secret.ts

@@ -0,0 +1,69 @@
+/*
+CPAL-1.0 License
+
+The contents of this file are subject to the Common Public Attribution License
+Version 1.0. (the "License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+https://github.com/EtherealEngine/etherealengine/blob/dev/LICENSE.
+The License is based on the Mozilla Public License Version 1.1, but Sections 14
+and 15 have been added to cover use of software over a computer network and 
+provide for limited attribution for the Original Developer. In addition, 
+Exhibit A has been modified to be consistent with Exhibit B.
+
+Software distributed under the License is distributed on an "AS IS" basis,
+WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
+specific language governing rights and limitations under the License.
+
+The Original Code is Ethereal Engine.
+
+The Original Developer is the Initial Developer. The Initial Developer of the
+Original Code is the Ethereal Engine team.
+
+All portions of the code written by the Ethereal Engine team are Copyright © 2021-2023 
+Ethereal Engine. All Rights Reserved.
+*/
+
+import logger from '@etherealengine/server-core/src/ServerLogger'
+import cli from 'cli'
+import fs from 'fs'
+import Jwt from 'jsonwebtoken'
+
+cli.enable('status')
+
+cli.main(async () => {
+  try {
+    const creds = cli.parse({
+      secretKeyPath: ['', 'Path to Apple SSO secret key.p8', 'string'],
+      keyId: ['', 'Key ID of the Secret Key generated in Apple Developer Account', 'string'],
+      teamId: ['', 'Team ID of the Apple Developer Account', 'string'],
+      clientId: ['', 'The client ID of the service ID created in the Apple Developer Account', 'string']
+    })
+    if (!creds.secretKeyPath || !creds.keyId || !creds.teamId || !creds.clientId) {
+      cli.fatal('Please provide all the required arguments')
+    }
+    const privateKey = fs.readFileSync(creds.secretKeyPath)
+
+    const claims = {
+      iss: creds.teamId,
+      aud: 'https://appleid.apple.com',
+      sub: creds.clientId
+    }
+
+    const clientSecret = Jwt.sign(claims, privateKey, {
+      algorithm: 'ES256',
+      header: {
+        alg: 'ES256',
+        kid: creds.keyId,
+        typ: 'JWT'
+      },
+      expiresIn: '180d' // The token will expire in 180 days. The token can be set to expire in a shorter time but not more than 6 months.
+    })
+
+    logger.info(clientSecret)
+    process.exit(0)
+  } catch (err) {
+    console.log('Error while generating client secret for Apple')
+    console.log(err)
+    cli.fatal(err)
+  }
+})