Guides
Guides

Middlewares

Middlewares are used to defined actions before and after each request. For example, if we want to authenticate the context before it gets into the context, we can define a middleware as this:

func AuthMiddleware(next golf.Handler) golf.Handler {
  fn := func(ctx *golf.Context) {
    if authenticate(ctx) {
      next(ctx)
    } else {
      NotFoundHandler(ctx)
    }
  }
  return fn
}

After the middleware is defined, we need to define a middleware chain. A middleware chain contains a sequence of middlewares. Middlewares in the middleware chain will be called as the defined sequence.

To apply a handler to a middleware chain and pass it to a route, we need to call the Final method of the chain:

authChain := golf.NewChain(handler.AuthMiddleware)

App.Get("/admin/", authChain.Final(handler.AdminHandler))
App.Get("/admin/settings/", authChain.Final(handler.AdminSettingsHandler))