[英]How to mount a servlet filter in blaze server (http4s)
I am a newbie in scala world and using http4s for developing the REST layer of my application. 我是scala世界中的新手,并且使用http4s开发应用程序的REST层。 I am using blaze server for deploying/publishing the services.
我正在使用blaze服务器来部署/发布服务。 I need to mount a servlet filter or interceptor in the flow before it reaches my HttpService methods.
在到达我的HttpService方法之前,我需要在流中安装servlet过滤器或拦截器。 How can I do that?
我怎样才能做到这一点?
http4s library has so called middleware functionality. http4s库具有所谓的中间件功能。 Middleware functionality is a wrapper around your service.
中间件功能是服务的包装。 For example, you have simple endpoint:
例如,您有简单的端点:
val helloWorldService = HttpService {
case GET -> Root / "hello" / name =>
Ok(s"Hello, $name.")
}
To apply middleware you may do the following: 要应用中间件,您可以执行以下操作:
val service: HttpService = middleware(authedService)
val authedService: AuthedService[User] =
AuthedService {
case GET -> Root / "welcome" as user => Ok(s"Welcome, ${user.name}")
}
val middleware = AuthMiddleware(authUser)
and your just need to implement your authUser
: 而您只需要实现您的
authUser
:
val authUser: Service[Request, User] = ???
You may want to check out the org.http4s.server.middleware package for already existent middleware. 您可能需要检出org.http4s.server.middleware软件包中是否已存在的中间件。
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