Mounting the router on a route group

[matthewcheok]

Suppose we had some route configuration like:

func routes(_ app: Application) throws {
  let unprotectedAPI = app.grouped("api")

  let tokenProtectedAPI = unprotectedAPI
    .grouped(Token.authenticator())
    .grouped(UserModel.guardMiddleware())
  
  try tokenProtectedAPI
    .grouped("users")
    .register(collection: UserController())
}

How would we convert this to use a parser-backed router? This is generally useful for chaining on middlewares to specific route groups, i.e. if we wanted everything behind the api path to require token-based authentication.

[matthewcheok]

I tried adding this extension:

extension RoutesBuilder {
  public func mount<R: Parser>(
    _ router: R,
    use closure: @escaping (Request, R.Output) async throws -> AsyncResponseEncodable
  ) where R.Input == URLRequestData {
    self.grouped(AsyncRoutingMiddleware(router: router, respond: closure))
  }
}

// routes.swift
tokenProtectedAPI.mount(apiRouter, use: apiHandler)

But it looks like unlike global middleware, route-specific middlewares are not even executed if the route group does not contain any routes.