Learning Functional Programming in Go

Authenticate filter

Our authentication logic is hardcoded and simple, that is, not what I'd call production ready. The password secret will work for any username. If Authenticate encounters secret in the Credentials field, the order will flow unchanged to the next step in the pipeline. However, if the password is not secret, then the order's isValid field will be set to false. The behavior or subsequent filters in the pipeline can be affected by this value:

type Authenticate struct {}
func (a Authenticate) Filter(input chan Order) chan Order {
       output := make(chan Order)
       go func(){
              for order := range input {
                     usernamePwd := strings.Split(order.Credentials, ",")
                     if usernamePwd[1] == "secret" { order.IsAuthenticated = true output <- order }  ...