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Merge pull request #140 from ubaldop/json-support
Add support to JSON encoding and decoding
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66 changes: 66 additions & 0 deletions
66
json/src/main/scala/org/http4s/fs2data/json/JsonInstances.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * Copyright 2023 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 fs2data.json | ||
|
|
||
| import cats.data.NonEmptyList | ||
| import cats.effect.Concurrent | ||
| import cats.syntax.applicative._ | ||
| import cats.syntax.monadError._ | ||
| import fs2.data.json._ | ||
| import fs2.Stream | ||
| import cats.syntax.show._ | ||
| import org.http4s.Charset.`UTF-8` | ||
| import org.http4s.headers.{`Content-Type`, `Transfer-Encoding`} | ||
|
|
||
| trait JsonInstances { | ||
|
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| implicit def jsonTokensDecoder[F[_]: Concurrent]: EntityDecoder[F, Stream[F, Token]] = | ||
| EntityDecoder.decodeBy(MediaType.application.json) { msg => | ||
| DecodeResult.successT( | ||
| msg.bodyText | ||
| .through(tokens) | ||
| .adaptError { case ex: JsonException => | ||
| MalformedMessageBodyFailure( | ||
| s"Invalid Json (${ex.context.fold("No context")(jc => jc.show)}): ${ex.msg}", | ||
| Some(ex), | ||
| ) | ||
| } | ||
| ) | ||
| } | ||
|
|
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| def jsonTokensEncoder[F[_]](prettyPrint: Boolean)(implicit | ||
| charset: Charset = `UTF-8` | ||
| ): EntityEncoder[F, Stream[F, Token]] = EntityEncoder.encodeBy( | ||
| Headers( | ||
| `Content-Type`(MediaType.application.json).withCharset(charset), | ||
| `Transfer-Encoding`(TransferCoding.chunked.pure[NonEmptyList]), | ||
| ) | ||
| ) { tokens => | ||
| Entity( | ||
| tokens | ||
| .through( | ||
| if (prettyPrint) render.pretty() else render.compact | ||
| ) | ||
| .through(fs2.text.encode[F](charset.nioCharset)) | ||
| ) | ||
| } | ||
|
|
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| implicit def jsonTokensEncoder[F[_]]: EntityEncoder[F, Stream[F, Token]] = | ||
| jsonTokensEncoder(prettyPrint = false) | ||
|
|
||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| /* | ||
| * Copyright 2023 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. | ||
| */ | ||
|
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| package org.http4s.fs2data | ||
|
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| package object json extends JsonInstances |
55 changes: 55 additions & 0 deletions
55
json/src/test/scala/org/http4s/fs2data/json/JsonEventSuite.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package org.http4s.fs2data.json | ||
|
|
||
| import cats.effect.IO | ||
| import cats.syntax.all._ | ||
| import fs2.Stream | ||
| import fs2.data.json._ | ||
| import fs2.data.json.literals.JsonInterpolator | ||
| import munit.CatsEffectSuite | ||
| import munit.ScalaCheckEffectSuite | ||
| import org.http4s.EntityDecoder | ||
| import org.http4s.Request | ||
|
|
||
| class JsonEventSuite extends CatsEffectSuite with ScalaCheckEffectSuite { | ||
| test("round-trip Json") { | ||
| val in = json"""{"a": 1, "b": [true, false, null], "c": {"d": "e"}, "d": 1.2e3, "b": null}""" | ||
| Stream | ||
| .force(Request[IO]().withEntity(in.lift[IO]).as[Stream[IO, Token]]) | ||
| .compile | ||
| .toList | ||
| .map(_.asRight[Throwable]) | ||
| .assertEquals(in.toList) | ||
| } | ||
|
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| test("round-trip Json string") { | ||
| val in = """{"a":1,"b":[true,false,null],"c":{"d":"e"},"d":1.2e3,"b":null}""" | ||
| Request[IO]() | ||
| .withEntity(in) | ||
| .as[Stream[IO, Token]] | ||
| .map(Request[IO]().withEntity(_)) | ||
| .flatMap(EntityDecoder.text[IO].decode(_, false).value) | ||
| .assertEquals(Right(in)) | ||
| } | ||
|
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| test("round-trip Json pretty printing") { | ||
| val in = """{ | ||
| | "a": 1, | ||
| | "b": [ | ||
| | true, | ||
| | false, | ||
| | null | ||
| | ], | ||
| | "c": { | ||
| | "d": "e" | ||
| | }, | ||
| | "d": 1.2e3, | ||
| | "b": null | ||
| |}""".stripMargin | ||
| Request[IO]() | ||
| .withEntity(in) | ||
| .as[Stream[IO, Token]] | ||
| .map(Request[IO]().withEntity(_)(jsonTokensEncoder[IO](prettyPrint = true))) | ||
| .flatMap(EntityDecoder.text[IO].decode(_, false).value) | ||
| .assertEquals(Right(in)) | ||
| } | ||
| } |