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Date.scala
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Date.scala
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/*
* Copyright 2014 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s.server.middleware
import cats._
import cats.data.Kleisli
import cats.effect._
import cats.syntax.all._
import org.http4s._
import org.http4s.headers.{Date => HDate}
/** Date Middleware, adds the Date Header to All Responses generated
* by the service.
*/
object Date {
def apply[G[_]: MonadThrow: Clock, F[_], A](
k: Kleisli[G, A, Response[F]]
): Kleisli[G, A, Response[F]] =
Kleisli { a =>
for {
resp <- k(a)
header <-
resp.headers
.get[HDate]
.fold(
HttpDate.current[G].map(HDate(_))
)(_.pure[G])
} yield resp.putHeaders(header)
}
def httpRoutes[F[_]: MonadThrow: Clock](routes: HttpRoutes[F]): HttpRoutes[F] =
apply(routes)
def httpApp[F[_]: MonadThrow: Clock](app: HttpApp[F]): HttpApp[F] =
apply(app)
}