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EntityLimiter.scala
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EntityLimiter.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
package server
package middleware
import cats.ApplicativeThrow
import cats.data.Kleisli
import fs2._
import scala.util.control.NoStackTrace
object EntityLimiter {
final case class EntityTooLarge(limit: Long) extends Exception with NoStackTrace
val DefaultMaxEntitySize: Long = 2L * 1024L * 1024L // 2 MB default
def apply[F[_], G[_], B](http: Kleisli[F, Request[G], B], limit: Long = DefaultMaxEntitySize)(
implicit G: ApplicativeThrow[G]
): Kleisli[F, Request[G], B] =
http.local(_.pipeBodyThrough(takeLimited(limit)))
def httpRoutes[F[_]: ApplicativeThrow](
httpRoutes: HttpRoutes[F],
limit: Long = DefaultMaxEntitySize,
): HttpRoutes[F] =
apply(httpRoutes, limit)
def httpApp[F[_]: ApplicativeThrow](
httpApp: HttpApp[F],
limit: Long = DefaultMaxEntitySize,
): HttpApp[F] =
apply(httpApp, limit)
private def takeLimited[F[_]](n: Long)(implicit F: ApplicativeThrow[F]): Pipe[F, Byte, Byte] =
_.pull
.take(n)
.flatMap {
case Some(_) => Pull.raiseError[F](EntityTooLarge(n))
case None => Pull.done
}
.stream
}