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ResourceService.scala
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ResourceService.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 staticcontent
import cats.data.Kleisli
import cats.data.OptionT
import cats.effect.Async
import cats.syntax.all._
import org.http4s.server.middleware.TranslateUri
import org.typelevel.log4cats.LoggerFactory
import java.io.File
import java.nio.file.Paths
import scala.util.Failure
import scala.util.Success
import scala.util.Try
import scala.util.control.NoStackTrace
/** [[org.http4s.server.staticcontent.ResourceServiceBuilder]] builder
*
* @param basePath prefix of the path files will be served from
* @param pathPrefix prefix of the Uri that content will be served from
* @param bufferSize size hint of internal buffers to use when serving resources
* @param cacheStrategy strategy to use for caching purposes.
* @param preferGzipped whether to serve pre-gzipped files (with extension ".gz") if they exist
* @param classLoader optional classloader for extracting the resources
*/
class ResourceServiceBuilder[F[_]: LoggerFactory] private (
basePath: String,
pathPrefix: String,
bufferSize: Int,
cacheStrategy: CacheStrategy[F],
preferGzipped: Boolean,
classLoader: Option[ClassLoader],
) {
private[this] val logger = LoggerFactory[F].getLogger
private def copy(
basePath: String = basePath,
pathPrefix: String = pathPrefix,
bufferSize: Int = bufferSize,
cacheStrategy: CacheStrategy[F] = cacheStrategy,
preferGzipped: Boolean = preferGzipped,
classLoader: Option[ClassLoader] = classLoader,
): ResourceServiceBuilder[F] =
new ResourceServiceBuilder[F](
basePath,
pathPrefix,
bufferSize,
cacheStrategy,
preferGzipped,
classLoader,
)
def withBasePath(basePath: String): ResourceServiceBuilder[F] = copy(basePath = basePath)
def withPathPrefix(pathPrefix: String): ResourceServiceBuilder[F] =
copy(pathPrefix = pathPrefix)
def withCacheStrategy(cacheStrategy: CacheStrategy[F]): ResourceServiceBuilder[F] =
copy(cacheStrategy = cacheStrategy)
def withPreferGzipped(preferGzipped: Boolean): ResourceServiceBuilder[F] =
copy(preferGzipped = preferGzipped)
def withClassLoader(classLoader: Option[ClassLoader]): ResourceServiceBuilder[F] =
copy(classLoader = classLoader)
def withBufferSize(bufferSize: Int): ResourceServiceBuilder[F] = copy(bufferSize = bufferSize)
def toRoutes(implicit F: Async[F]): F[HttpRoutes[F]] = {
val basePath = if (this.basePath.isEmpty) "/" else this.basePath
object BadTraversal extends Exception with NoStackTrace
Try(Paths.get(basePath)) match {
case Success(rootPath) =>
TranslateUri(pathPrefix)(HttpRoutes[F] {
case request if request.pathInfo.nonEmpty =>
val segments = request.pathInfo.segments.map(_.decoded(plusIsSpace = true))
OptionT
.liftF(F.catchNonFatal {
segments.foldLeft(rootPath) {
case (_, "" | "." | "..") => throw BadTraversal
case (path, segment) =>
path.resolve(segment)
}
})
.collect {
case path if path.startsWith(rootPath) => path
}
.flatMap { path =>
StaticFile.fromResource(
path.toString.replace(File.separatorChar, '/'),
Some(request),
preferGzipped = preferGzipped,
classLoader,
)
}
.semiflatMap(cacheStrategy.cache(request.pathInfo, _))
.recoverWith { case BadTraversal =>
OptionT.some(Response(Status.BadRequest))
}
case _ => OptionT.none
}).pure[F]
case Failure(e) =>
logger
.error(e)(
s"Could not get root path from ResourceService config: basePath = $basePath, pathPrefix = $pathPrefix. All requests will fail."
)
.as(Kleisli(_ => OptionT.pure(Response(Status.InternalServerError))))
}
}
}
object ResourceServiceBuilder {
def apply[F[_]: LoggerFactory](basePath: String): ResourceServiceBuilder[F] =
new ResourceServiceBuilder[F](
basePath = basePath,
pathPrefix = "",
bufferSize = 50 * 1024,
cacheStrategy = NoopCacheStrategy[F],
preferGzipped = false,
classLoader = None,
)
}
object ResourceService {
/** [[org.http4s.server.staticcontent.ResourceService]] configuration
*
* @param basePath prefix of the path files will be served from
* @param pathPrefix prefix of the Uri that content will be served from
* @param bufferSize size hint of internal buffers to use when serving resources
* @param cacheStrategy strategy to use for caching purposes. Default to no caching.
* @param preferGzipped whether to serve pre-gzipped files (with extension ".gz") if they exist
*/
final case class Config[F[_]](
basePath: String,
pathPrefix: String = "",
bufferSize: Int = 50 * 1024,
cacheStrategy: CacheStrategy[F] = NoopCacheStrategy[F],
preferGzipped: Boolean = false,
)
}