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TranslateUri.scala
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TranslateUri.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.middleware
import cats.MonoidK
import cats.data.Kleisli
import cats.syntax.all._
/** Removes the given prefix from the beginning of the path of the [[Request]].
*/
object TranslateUri {
def apply[F[_], G[_], B](
prefix: String
)(http: Kleisli[F, Request[G], B])(implicit F: MonoidK[F]): Kleisli[F, Request[G], B] =
if (prefix.isEmpty || prefix == "/") http
else {
val prefixAsPath = Uri.Path.unsafeFromString(prefix)
Kleisli { (req: Request[G]) =>
val newCaret = req.pathInfo.findSplit(prefixAsPath)
val shouldTranslate = req.pathInfo.startsWith(prefixAsPath)
if (shouldTranslate) http(setCaret(req, newCaret))
else F.empty
}
}
private def setCaret[F[_]](req: Request[F], newCaret: Option[Int]): Request[F] = {
val oldCaret = req.attributes.lookup(Request.Keys.PathInfoCaret)
val combined = oldCaret |+| newCaret
combined match {
case Some(value) => req.withAttribute(Request.Keys.PathInfoCaret, value)
case None => req
}
}
}