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Merge pull request #439 from armanbilge/topic/api-gateway-proxy-handl…
…er-refactor `ApiGatewayProxyHandler` -> `ApiGatewayProxyHandlerV2`
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98 changes: 98 additions & 0 deletions
98
lambda-http4s/src/main/scala/feral/lambda/http4s/ApiGatewayProxyHandlerV2.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * Copyright 2021 Typelevel | ||
| * | ||
| * 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 feral.lambda | ||
| package http4s | ||
|
|
||
| import cats.effect.kernel.Concurrent | ||
| import cats.syntax.all._ | ||
| import feral.lambda.events.ApiGatewayProxyEventV2 | ||
| import feral.lambda.events.ApiGatewayProxyStructuredResultV2 | ||
| import fs2.Stream | ||
| import org.http4s.Charset | ||
| import org.http4s.Header | ||
| import org.http4s.Headers | ||
| import org.http4s.HttpApp | ||
| import org.http4s.HttpRoutes | ||
| import org.http4s.Method | ||
| import org.http4s.Request | ||
| import org.http4s.Uri | ||
| import org.http4s.headers.Cookie | ||
| import org.http4s.headers.`Set-Cookie` | ||
|
|
||
| object ApiGatewayProxyHandlerV2 { | ||
|
|
||
| @deprecated("Use apply(routes.orNotFound)", "0.3.0") | ||
| def httpRoutes[F[_]: Concurrent: ApiGatewayProxyInvocationV2]( | ||
| routes: HttpRoutes[F]): F[Option[ApiGatewayProxyStructuredResultV2]] = apply( | ||
| routes.orNotFound) | ||
|
|
||
| def apply[F[_]: Concurrent: ApiGatewayProxyInvocationV2]( | ||
| app: HttpApp[F]): F[Option[ApiGatewayProxyStructuredResultV2]] = | ||
| for { | ||
| event <- Invocation.event | ||
| request <- decodeEvent(event) | ||
| response <- app(request) | ||
| isBase64Encoded = !response.charset.contains(Charset.`UTF-8`) | ||
| responseBody <- response | ||
| .body | ||
| .through( | ||
| if (isBase64Encoded) fs2.text.base64.encode else fs2.text.utf8.decode | ||
| ) | ||
| .compile | ||
| .string | ||
| } yield { | ||
| val headers = response.headers.headers.groupMap(_.name)(_.value) | ||
| Some( | ||
| ApiGatewayProxyStructuredResultV2( | ||
| response.status.code, | ||
| (headers - `Set-Cookie`.name).map { | ||
| case (name, values) => | ||
| name -> values.mkString(",") | ||
| }, | ||
| responseBody, | ||
| isBase64Encoded, | ||
| headers.getOrElse(`Set-Cookie`.name, Nil) | ||
| ) | ||
| ) | ||
| } | ||
|
|
||
| private[http4s] def decodeEvent[F[_]: Concurrent]( | ||
| event: ApiGatewayProxyEventV2): F[Request[F]] = for { | ||
| method <- Method.fromString(event.requestContext.http.method).liftTo[F] | ||
| uri <- Uri.fromString(event.rawPath + "?" + event.rawQueryString).liftTo[F] | ||
| headers = { | ||
| val builder = List.newBuilder[Header.Raw] | ||
|
|
||
| event.headers.foreachEntry(builder += Header.Raw(_, _)) | ||
| event.cookies.filter(_.nonEmpty).foreach { cs => | ||
| builder += Header.Raw(Cookie.name, cs.mkString("; ")) | ||
| } | ||
|
|
||
| Headers(builder.result()) | ||
| } | ||
| readBody = | ||
| if (event.isBase64Encoded) | ||
| fs2.text.base64.decode[F] | ||
| else | ||
| fs2.text.utf8.encode[F] | ||
| } yield Request( | ||
| method, | ||
| uri, | ||
| headers = headers, | ||
| body = Stream.fromOption[F](event.body).through(readBody) | ||
| ) | ||
| } |
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