🔧 Make server port and base URL configurable

[0GiS0]

🔍 Issue

The application has two hardcoded configuration issues:

1. Hardcoded Port - server.js line 113:

   app.listen(8000);

2. Hardcoded Localhost URL - views/device-code.ejs line 73:

   window.location.replace(`http://localhost:8000/access/token/?access_token=${access_token}`);

This makes it difficult to:

• Deploy to cloud platforms (Heroku, Azure App Service, AWS) that assign dynamic ports
• Run multiple instances for testing
• Use HTTPS in production
• Run behind a reverse proxy or load balancer

💡 Proposed Solution

1. Make Port Configurable

Update .env.sample:

TENANT_ID="<YOUR TENANT ID>"
CLIENT_ID="<YOUR CLIENT ID>"
PORT=8000
BASE_URL="http://localhost:8000"

Update server.js:

const PORT = process.env.PORT || 8000;
const BASE_URL = process.env.BASE_URL || `http://localhost:${PORT}`;

app.locals.baseUrl = BASE_URL; // Make available to views

// ...

app.listen(PORT, () => {
  log.info(`Server listening on port ${PORT}`);
  log.info(`Visit ${BASE_URL}`);
});

2. Use BASE_URL in Views

Update views/device-code.ejs:

window.location.replace(`<%= baseUrl %>/access/token/?access_token=${access_token}`);

3. Add Environment Variable Validation

Add validation at server startup:

if (!process.env.TENANT_ID || !process.env.CLIENT_ID) {
  log.error("Missing required environment variables: TENANT_ID and/or CLIENT_ID");
  log.error("Please create a .env file based on .env.sample");
  process.exit(1);
}

🎯 Benefits

• Cloud-Ready - Works on any cloud platform with dynamic port assignment
• Flexible Deployment - Easy to deploy in different environments (dev, staging, prod)
• Docker-Friendly - Can run in containers with mapped ports
• HTTPS Support - Can use production URLs with HTTPS
• Better DX - Clear error messages when configuration is missing

📚 Additional Context

Most cloud platforms (Heroku, Azure, Railway, Render) provide the port via process.env.PORT. This change makes the app compatible with these platforms out of the box.

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