Header Proxy plugin for traefik

This plugin proxies requests to desired destination (outside of traefik) based on headers provided in the configuration.

Dev traefik.yml configuration file for traefik

pilot:
  token: [REDACTED]

experimental:
  devPlugin:
    goPath: /home/user/go
    moduleName: github.com/apwe/headerproxy

entryPoints:
  http:
    address: ":8000"
    forwardedHeaders:
      insecure: true

providers:
  file:
    filename: rules-headerproxy.yaml 

How to dev

$ docker run -d --network host containous/whoami -port 5000
# traefik --config-file traefik.yml

How to use

Headers

Provide header names:

• 'TenantHeader' : a header controlling the tenant that the requests will be proxied to
• 'ServiceHeader' : a header controlling a service from the tenant that the request will be proxied to

          Headers:
            TenantHeader: 'Tenant'
            ServiceHeader: 'Service'

So, in order to match the configuration, you need to hit traefik with a request containing 'Tenant: tenant-name' and 'Service: service-name' headers.

Tenants

Provide tenant names as the keys - these are the values of your 'TenantHeader: $$$%%#^$' header passed to traefik:

          Tenants:
            tenant-name-a:
...
            tenant-name-b:
...

Services

Provide service names as the keys - these are the values of your 'ServiceHeader: &$^#$&#$' header passed to traefik

            tenant-name-a:
              Services:
                ServiceA:
...
                ServiceB: 
...
                ServiceC: 
...
            tenant-name-b:
              Services:
                ServiceA: 
...
                ServiceB:
...
                ServiceC: 
...

Destination

Provide value to the 'Destination' key with the url of the service you want to proxy the requests. urls MUST contain protocol scheme, as the plugin is parsing the url and using the scheme in the communication.

                ServiceA: 
                  Destination: 'https://example-a.com'
                ServiceB: 
                  Destination: 'https://example-b.com'
                ServiceC: 
                  Destination: 'https://example-c.com'

Example configuration for traefik file provider

http:
  routers:
    my-router:
      entryPoints:
      - http
      middlewares:
      - headerproxy
      service: service-whoami
      rule: Path(`/whoami`)

  services:
    service-whoami:
      loadBalancer:
        servers:
        - url: http://localhost:5000/
      passHostHeader: false
  middlewares:
    headerproxy:
      plugin:
        dev:
          Headers:
            TenantHeader: 'Tenant'
            ServiceHeader: 'Service'
          Tenants:
            tenant-name-a:
              Services:
                ServiceA: 
                  Destination: 'https://example-a.com'
                ServiceB: 
                  Destination: 'https://example-b.com'
                ServiceC: 
                  Destination: 'https://example-c.com'
            tenant-name-b:
              Services:
                ServiceA: 
                  Destination: 'https://example-a.com'
                ServiceB: 
                  Destination: 'https://example-b.com'