/
JawnInstances.scala
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/
JawnInstances.scala
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/*
* Copyright 2013-2020 http4s.org
*
* SPDX-License-Identifier: Apache-2.0
*/
package org.http4s
package jawn
import cats.effect._
import cats.implicits._
import fs2.Stream
import org.typelevel.jawn.{AsyncParser, Facade, ParseException}
import jawnfs2._
trait JawnInstances {
def jawnDecoder[F[_]: Sync, 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[_]: Sync, 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")
}