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JawnInstances.scala
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JawnInstances.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 jawn
import cats.effect._
import cats.syntax.all._
import fs2.Stream
import org.typelevel.jawn.AsyncParser
import org.typelevel.jawn.Facade
import org.typelevel.jawn.ParseException
import org.typelevel.jawn.fs2._
trait JawnInstances {
def jawnDecoder[F[_]: Concurrent, J: Facade]: EntityDecoder[F, J] =
EntityDecoder.decodeBy(MediaType.application.json)(jawnDecoderImpl[F, J])
protected def jawnParseExceptionMessage: ParseException => DecodeFailure =
JawnInstances.defaultJawnParseExceptionMessage
protected def jawnEmptyBodyMessage: DecodeFailure =
JawnInstances.defaultJawnEmptyBodyMessage
// some decoders may reuse it and avoid extra content negotiation
private[http4s] def jawnDecoderImpl[F[_]: Concurrent, J: Facade](
m: Media[F]
): DecodeResult[F, J] =
DecodeResult {
m.body.chunks
.parseJson(AsyncParser.SingleValue)
.map(Either.right)
.handleErrorWith {
case pe: ParseException =>
Stream.emit(Left(jawnParseExceptionMessage(pe)))
case e =>
Stream.raiseError[F](e)
}
.compile
.last
.map(_.getOrElse(Left(jawnEmptyBodyMessage)))
}
}
object JawnInstances {
private[http4s] def defaultJawnParseExceptionMessage: ParseException => DecodeFailure =
pe => MalformedMessageBodyFailure("Invalid JSON", Some(pe))
private[http4s] def defaultJawnEmptyBodyMessage: DecodeFailure =
MalformedMessageBodyFailure("Invalid JSON: empty body")
}