play for scala implements SessionFilter to filter unlogged users to jump to the login page
- 2020-05-17 05:34:37
- OfStack
1. Write SessionFilter.scala code
package filters
import javax.inject.{Inject, Singleton}
import akka.stream.Materializer
import controllers.routes
import play.api.mvc.{Filter, RequestHeader, Result, Results}
import scala.concurrent.Future
@Singleton
class SessionFilter @Inject()(implicit val mat: Materializer) extends Filter {
def apply(nextFilter: RequestHeader => Future[Result])
(requestHeader: RequestHeader): Future[Result] = {
if (!requestHeader.session.get("user").isDefined && !requestHeader.path.contains("/signin") && !requestHeader.path.contains("/assets/")) {
Future.successful(Results.Redirect(routes.SignController.showSignin()))
} else {
nextFilter(requestHeader)
}
}
}
Description:
! requestHeader.session.get ("user").isDefined is used to determine whether user exists in session
! requestHeader.path.contains ("/signin") is used to exclude the login page, which should be visible when not logged in, to prevent the occurrence of a dead loop jump
! requestHeader.path.contains ("/assets/") is used to exclude static resource files such as images, css, JavaScript, and so on
2. Use SessionFilter in Filters.scala under app
Filters.scala is a template automatically generated by activator. To use SessionFilter, just add sessionFilter: SessionFilter and Seq(sessionFilter)
import javax.inject._
import filters.{ExampleFilter, SessionFilter}
import play.api._
import play.api.http.HttpFilters
import 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.
*/
@Singleton
class 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)
}
}