play for scala 實現SessionFilter 過濾未登錄用戶跳轉到登錄頁面

一、編寫SessionFilter.scala代碼

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").isDefined && !requestHeader.path.contains("/signin") && !requestHeader.path.contains("/assets/")) { Future.successful(Results.Redirect(routes.SignController.showSignin())) } else { nextFilter(requestHeader) } }}

說明：

!requestHeader.session.get("user").isDefined 是用來判斷session中是否存在user

!requestHeader.path.contains("/signin") 是用來排除登錄頁面，這個頁面不登錄也應該是可見的，防止出現死循環跳轉

!requestHeader.path.contains("/assets/") 是用來排除靜態資源文件的，如圖片、css、JavaScript等

二、在app目錄下的Filters.scala中使用SessionFilter

Filters.scala這個文件是activator自動生成的模板，要使用SessionFilter只要在裡面加上sessionFilter: SessionFilter和Seq(sessionFilter)就可以了

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) }}

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