simple-hosting

Simple reverse proxy for hosting multiple apps in the same server

npm i simple-hosting

Usage

Let's say you already have two apps running in a server: http://127.0.0.1:1337 and http://127.0.0.1:3000

Normally run this in a public server with DNS, and all app domains pointing to the same server IP.

const Hosting = require('simple-hosting')

const hosting = new Hosting()

// Replace with your own domains
hosting.add('a.leet.ar', { destination: 'http://127.0.0.1:1337' })
hosting.add('b.leet.ar', { destination: 'http://127.0.0.1:3000' })

hosting.add('c.leet.ar', {
  destination: 'http://127.0.0.1:3000', // Frontend
  location: {
    '/api': 'http://127.0.0.1:1010' // Backend
  }
})

await hosting.listen({ securePort: false })

// Try making requests to http://127.0.0.1:80 and setting the Host header accordingly
// Or if this is in a server then use your browser to request the actual domains

Feel free to open an issue if you have any doubt.

API

`const hosting = new Hosting([options])`

Creates a pair of servers that uses the Host header to dynamically load different apps.

{
  log: 0, // Enable logging (0=disabled, 1=requests, 2=SNI)
  behindProxy: false, // If hosting is behind CloudFlare or NGINX then enable this option
  auth: String, // Secret token that must be sent in the request header "x-simple-hosting"
  certbot: true // Handle renewal of certificates
}

If you're not behind any kind of proxy then don't worry about the auth option.

If you're behind CloudFlare, NGINX, etc then to avoid spoofing headers you must use the auth option.

CloudFlare authentication:

Go to Rules -> Transform Rules -> Modify Request Header.
Create a rule for all incoming requests.
Set the header name as x-simple-hosting with your secret auth token as value.

NGINX authentication:

Configure it like proxy_set_header x-simple-hosting <secret-auth-token>

Certbot

Hosting can automatically handle renewals for any domain even if not managed by Hosting itself.

Issue a certficiate:

sudo certbot certonly --webroot --webroot-path /tmp/letsencrypt -d sub.example.com

Let it auto-renew with its cron or manually run it:

sudo certbot renew

`hosting.add(servername, options)`

Add a new app to the hosting by its domain name.

Available options:

{
  destination: String, // Target URL (required)
  location: Object, // Extra "starts with" URL matches
  cert: String, // Eg fullchain.pem
  key: String, // Eg privkey.pem
  certbot: false, // Use default paths for Certbot (ignores `cert` and `key` options)
  behindProxy, // Inherits the Hosting value by default (pass false to disable)
  auth // Inherits the Hosting value by default (pass null to disable)
}

cert and key are used to create the secure context for the HTTPS server.

Files will be watched for changes to auto-update the secure context.

If you use CloudFlare in front of Hosting then you don't need to set the certificate and key.

Otherwise consider using Certbot.

`hosting.edit(servername, [options])`

Change the app configuration in real-time. For example, you could change the destination URL.

Same options as for adding an app.

`await hosting.listen([options])`

Start listening for new requests. Each hosting has two servers (HTTP and HTTPS).