some progress, interrupted because MusicKit bugs

backend/config/apple-music-api.config.json

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+{ 
+    "teamID": "",
+    "keyID": "",
+    "storefront": "us"
+}

backend/dist/app.js

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+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const express_1 = __importDefault(require("express"));
+const path_1 = __importDefault(require("path"));
+const fs_1 = __importDefault(require("fs"));
+const jsonwebtoken_1 = __importDefault(require("jsonwebtoken"));
+const cors_1 = __importDefault(require("cors"));
+if (typeof (__dirname) === 'undefined') {
+    __dirname = path_1.default.resolve(path_1.default.dirname(''));
+}
+const run = () => {
+    let app = (0, express_1.default)();
+    app.use((0, cors_1.default)({
+        credentials: true,
+        origin: true
+    }));
+    app.get('/', (request, response) => {
+        response.send('HELLO WORLD');
+    });
+    app.get('/getAppleMusicDevToken', (req, res) => {
+        // sign dev token
+        const privateKey = fs_1.default.readFileSync(path_1.default.join(__dirname + '/config/apple_private_key.p8')).toString();
+        // TODO: Remove secret
+        const config = JSON.parse('' + fs_1.default.readFileSync(path_1.default.join(__dirname + '/config/apple-music-api.config.json')));
+        const jwtToken = jsonwebtoken_1.default.sign({}, privateKey, {
+            algorithm: "ES256",
+            expiresIn: "180d",
+            issuer: config.teamID,
+            header: {
+                alg: "ES256",
+                kid: config.keyID
+            }
+        });
+        res.send(jwtToken);
+    });
+    app.use((request, response, next) => {
+        response.status(404).send('ERR_NOT_FOUND');
+        // response.sendFile( path.join( __dirname + '' ) ) 
+    });
+    const PORT = process.env.PORT || 8081;
+    app.listen(PORT);
+};
+exports.default = {
+    run
+};

backend/dist/config

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+../config/

backend/index.js

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+const app = require( './dist/app.js' ).default;
+app.run();

backend/package.json

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+{
+  "name": "musicplayer-v2-backend",
+  "version": "1.0.0",
+  "description": "The backend for MusicPlayerV2",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/simplePCBuilding/MusicPlayerV2.git"
+  },
+  "author": "Janis Hutz",
+  "license": "GPL-3.0-or-later",
+  "bugs": {
+    "url": "https://github.com/simplePCBuilding/MusicPlayerV2/issues"
+  },
+  "homepage": "https://github.com/simplePCBuilding/MusicPlayerV2#readme",
+  "devDependencies": {
+    "typescript": "^5.4.5"
+  },
+  "dependencies": {
+    "@types/body-parser": "^1.19.5",
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.21",
+    "@types/jsonwebtoken": "^9.0.6",
+    "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
+    "express": "^4.19.2",
+    "jsonwebtoken": "^9.0.2"
+  }
+}

backend/src/app.ts

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+import express from 'express';
+import path from 'path';
+import fs from 'fs';
+import bodyParser from 'body-parser';
+import jwt from 'jsonwebtoken';
+import cors from 'cors';
+
+declare let __dirname: string | undefined
+if ( typeof( __dirname ) === 'undefined' ) {
+    __dirname = path.resolve( path.dirname( '' ) );
+}
+
+const run = () => {
+    let app = express();
+    app.use( cors( { 
+        credentials: true,
+        origin: true 
+    } ) );
+
+    app.get( '/', ( request, response ) => {
+        response.send( 'HELLO WORLD' );
+    } );
+
+
+    app.get( '/getAppleMusicDevToken', ( req, res ) => {
+        // sign dev token
+        const privateKey = fs.readFileSync( path.join( __dirname + '/config/apple_private_key.p8' ) ).toString();
+        // TODO: Remove secret
+        const config = JSON.parse( '' + fs.readFileSync( path.join( __dirname + '/config/apple-music-api.config.json' ) ) );
+        const jwtToken = jwt.sign( {}, privateKey, {
+            algorithm: "ES256",
+            expiresIn: "180d",
+            issuer: config.teamID,
+            header: {
+                alg: "ES256",
+                kid: config.keyID
+            }
+        } );
+        res.send( jwtToken );
+    } );
+
+    app.use( ( request: express.Request, response: express.Response, next: express.NextFunction ) => {
+        response.status( 404 ).send( 'ERR_NOT_FOUND' );
+        // response.sendFile( path.join( __dirname + '' ) ) 
+    } );
+
+
+    const PORT = process.env.PORT || 8081;
+    app.listen( PORT );
+}
+
+export default {
+    run
+}

backend/tsconfig.json

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+{
+  "compilerOptions": {
+    "outDir": "./dist",
+    "allowJs": true,
+    "target": "ES6",
+    "skipLibCheck": true,
+    "allowSyntheticDefaultImports": true,
+    "types": ["node"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext"
+  },
+  "include": [ "./src/**/*" ],
+}