play for scala implements SessionFilter filtering for unlogged users to jump to the login page

1. Write SessionFilter.scala code

 package filtersimport javax.inject.{Inject, Singleton}import akka.stream.Materializerimport controllers.routesimport play.api.mvc.{Filter, RequestHeader, Result, Results}import scala.concurrent.Future@Singletonclass SessionFilter @Inject()(implicit val mat: Materializer) extends Filter { def apply(nextFilter: RequestHeader => Future[Result]) (requestHeader: RequestHeader): Future[Result] = { if (!requestHeader.session.get("user").isDefine && !requestHeader.path.contains("/signin") && !requestHeader.path.contains("/assets/")) { Future.successful(Results.Redirect(routes.SignController.showSignin())) } else { nextFilter(requestHeader) } }}

illustrate:

!requestHeader.session.get("user").isDefined is used to determine whether a user exists in the session

!requestHeader.path.contains("/signin") is used to exclude the login page. This page should be visible if it is not logged in, to prevent a dead loop jump.

!requestHeader.path.contains("/assets/") is used to exclude static resource files, such as pictures, css, JavaScript, etc.

2. Use SessionFilter in Filters.scala in the app directory

The Filters.scala file is a template automatically generated by the activater. To use SessionFilter, just add sessionFilter: SessionFilter and Seq(sessionFilter) to it.

 import javax.inject._import filters.{ExampleFilter, SessionFilter}import play.api._import play.api.http.HttpFiltersimport play.api.mvc._/** * This class configures filters that run on every request. This * class is queried by Play to get a list of filters. * * Play will automatically use filters from any class called * `Filters` that is placed the root package. You can load filters * from a different class by adding a `play.http.filters` setting to * the `application.conf` configuration file. * * @param env Basic environment settings for the current application. * @param exampleFilter A demonstration filter that adds a header to * each response. */@Singletonclass Filters @Inject() ( env: Environment, exampleFilter: ExampleFilter, sessionFilter: SessionFilter) extends HttpFilters { override val filters = { // Use the example filter if we're running development mode. If // we're running in production or test mode then don't use any // filters at all. if (env.mode == Mode.Dev) Seq(exampleFilter) else Seq.empty Seq(sessionFilter) }}

The above is the editor introduced to play for scala to implement SessionFilter filtering. Users who have not logged in jump to the login page. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to everyone in time. Thank you very much for your support to Wulin.com website!