-
Notifications
You must be signed in to change notification settings - Fork 787
/
EntityLimiter.scala
72 lines (61 loc) · 2.07 KB
/
EntityLimiter.scala
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
/*
* 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.MonadThrow
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],
F: ApplicativeThrow[F],
): Kleisli[F, Request[G], B] =
Kleisli[F, Request[G], B] { req =>
req.entity match {
case Entity.Empty =>
http.run(req)
case Entity.Strict(chunk) =>
if (chunk.size.toLong < limit) http.run(req)
else F.raiseError[B](EntityTooLarge(limit))
case Entity.Default(_, _) =>
http.run(req.pipeBodyThrough[G](takeLimited(limit)))
}
}
def httpRoutes[F[_]: MonadThrow](
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
}