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PushSupport.scala
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PushSupport.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.Monad
import cats.data.Kleisli
import cats.effect.SyncIO
import cats.syntax.all._
import org.typelevel.vault._
@deprecated("Obsolete. Not implemented by any backends.", "0.23.12")
object PushSupport {
private[this] val logger = Platform.loggerFactory.getLogger
implicit def http4sPushOps[F[_]](response: Response[F]): PushOps[F] =
new PushOps[F](response)
final class PushOps[F[_]](response: Response[F]) extends AnyRef {
def push(url: String, cascade: Boolean = true)(implicit req: Request[F]): Response[F] = {
val newUrl = {
val script = req.scriptName
if (script.nonEmpty) {
val sb = new StringBuilder()
sb.append(script.toAbsolute)
sb.append(url).result()
} else url
}
logger.trace(s"Adding push resource: $newUrl").unsafeRunSync()
val newPushResouces = response.attributes
.lookup(pushLocationKey)
.map(_ :+ PushLocation(newUrl, cascade))
.getOrElse(Vector(PushLocation(newUrl, cascade)))
response.copy(
entity = response.entity,
attributes = response.attributes.insert(PushSupport.pushLocationKey, newPushResouces),
)
}
}
private def collectResponse[F[_]](
r: Vector[PushLocation],
req: Request[F],
verify: String => Boolean,
routes: HttpRoutes[F],
)(implicit F: Monad[F]): F[Vector[PushResponse[F]]] = {
val emptyCollect: F[Vector[PushResponse[F]]] = F.pure(Vector.empty[PushResponse[F]])
def fetchAndAdd(facc: F[Vector[PushResponse[F]]], v: PushLocation): F[Vector[PushResponse[F]]] =
routes(req.withPathInfo(Uri.Path.unsafeFromString(v.location))).value.flatMap {
case None => emptyCollect
case Some(response) =>
if (v.cascade) {
val pr = PushResponse(v.location, response)
response.attributes.lookup(pushLocationKey) match {
case Some(pushed) => // Need to gather the sub resources
val fsubs = collectResponse(pushed, req, verify, routes)
F.map2(facc, fsubs)(_ ++ _ :+ pr)
case None => facc.map(_ :+ pr)
}
} else {
facc.map(_ :+ PushResponse(v.location, response))
}
}
r.filter(x => verify(x.location)).foldLeft(emptyCollect)(fetchAndAdd)
}
/** Transform the route such that requests will gather pushed resources
*
* @param routes HttpRoutes to transform
* @param verify method that determines if the location should be pushed
* @return Transformed route
*/
def apply[F[_]: Monad](
routes: HttpRoutes[F],
verify: String => Boolean = _ => true,
): HttpRoutes[F] = {
def gather(req: Request[F])(resp: Response[F]): Response[F] =
resp.attributes
.lookup(pushLocationKey)
.map { fresource =>
val collected = collectResponse(fresource, req, verify, routes)
resp.copy(
attributes = resp.attributes.insert(pushResponsesKey[F], collected)
)
}
.getOrElse(resp)
Kleisli(req => routes(req).map(gather(req)))
}
private[PushSupport] final case class PushLocation(location: String, cascade: Boolean)
private[http4s] final case class PushResponse[F[_]](location: String, resp: Response[F])
private[PushSupport] val pushLocationKey =
Key.newKey[SyncIO, Vector[PushLocation]].unsafeRunSync()
private[http4s] def pushResponsesKey[F[_]]: Key[F[Vector[PushResponse[F]]]] =
Keys.PushResponses.asInstanceOf[Key[F[Vector[PushResponse[F]]]]]
private[this] object Keys {
val PushResponses: Key[Any] = Key.newKey[SyncIO, Any].unsafeRunSync()
}
}