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Merge pull request #141 from mdsol/add-http4s-middleware
Create http4s mAuth middleware
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119 changes: 119 additions & 0 deletions
119
...es/mauth-authenticator-http4s/src/main/scala/com/mdsol/mauth/http4s/MAuthMiddleware.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package com.mdsol.mauth.http4s | ||
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| import cats.arrow.FunctionK | ||
| import cats.data.{Kleisli, OptionT} | ||
| import cats.effect.Sync | ||
| import cats.syntax.all._ | ||
| import cats.effect.kernel.Async | ||
| import cats.~> | ||
| import com.mdsol.mauth.MAuthRequest | ||
| import com.mdsol.mauth.scaladsl.Authenticator | ||
| import org.http4s.{Http, HttpApp, HttpRoutes, Response, Status} | ||
| import org.http4s.EntityDecoder._ | ||
| import org.typelevel.ci.CIString | ||
| import enumeratum._ | ||
| import org.typelevel.ci._ | ||
| import org.typelevel.log4cats.slf4j.Slf4jLogger | ||
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| import scala.concurrent.ExecutionContext | ||
| import scala.concurrent.duration.Duration | ||
| import scala.util.Try | ||
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| final case class MdsolAuthMissingHeaderRejection(headerName: String) extends Throwable | ||
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| sealed trait HeaderVersion extends EnumEntry | ||
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| object HeaderVersion extends Enum[HeaderVersion] { | ||
| val values = findValues | ||
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| case object V1 extends HeaderVersion { | ||
| val authHeaderName = ci"${MAuthRequest.X_MWS_AUTHENTICATION_HEADER_NAME}" | ||
| val timeHeaderName = ci"${MAuthRequest.X_MWS_TIME_HEADER_NAME}" | ||
| } | ||
| case object V2 extends HeaderVersion { | ||
| val authHeaderName = ci"${MAuthRequest.MCC_AUTHENTICATION_HEADER_NAME}" | ||
| val timeHeaderName = ci"${MAuthRequest.MCC_TIME_HEADER_NAME}" | ||
| } | ||
| } | ||
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| object MAuthMiddleware { | ||
| import HeaderVersion._ | ||
| def apply[G[_]: Sync, F[_]](requestValidationTimeout: Duration, fk: F ~> G)(http: Http[G, F])(implicit | ||
| authenticator: Authenticator, | ||
| ec: ExecutionContext, | ||
| F: Async[F] | ||
| ): Http[G, F] = | ||
| Kleisli { request => | ||
| val logger = Slf4jLogger.getLogger[G] | ||
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| def logAndReturnDefaultUnauthorizedReq(errorLogMsg: String) = | ||
| logger.warn(errorLogMsg) *> | ||
| Response[F](status = Status.Unauthorized).pure[G] | ||
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| def extractHeader[A](headerName: CIString)(f: String => F[A]) = | ||
| request.headers | ||
| .get(headerName) | ||
| .map(_.head) | ||
| .fold(F.raiseError[A](MdsolAuthMissingHeaderRejection(headerName.toString))) { header => | ||
| f(header.value) | ||
| } | ||
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| def extractAll(headerVersion: HeaderVersion) = { | ||
| val (ahn, thn) = headerVersion match { | ||
| case V1 => (V1.authHeaderName, V1.timeHeaderName) | ||
| case V2 => (V2.authHeaderName, V2.timeHeaderName) | ||
| } | ||
| for { | ||
| authHeadValue <- extractHeader(ahn)(s => s.pure[F]) | ||
| timeHeadValue <- extractHeader(thn)(s => Try(s.toLong).liftTo[F]) | ||
| } yield (authHeadValue, timeHeadValue) | ||
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| } | ||
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| def getHeaderValOrEmpty(headerName: CIString) = | ||
| request.headers.get(headerName).map(_.head).fold("")(h => h.value) | ||
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| val authHeaderTimeHeader = | ||
| if (authenticator.isV2OnlyAuthenticate) | ||
| extractAll(V2) | ||
| else | ||
| extractAll(V2) orElse extractAll(V1) | ||
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| fk(request.as[Array[Byte]].flatMap { byteArray => | ||
| authHeaderTimeHeader.flatMap { case (authHeader, timeHeader) => | ||
| val mAuthRequest: MAuthRequest = new MAuthRequest( | ||
| authHeader, | ||
| byteArray, | ||
| request.method.name, | ||
| timeHeader.toString, | ||
| request.uri.path.renderString, | ||
| request.uri.query.renderString | ||
| ) | ||
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| // this mimics MAuthDirectives in the akka package - really needed? | ||
| val req = if (!authenticator.isV2OnlyAuthenticate) { | ||
| mAuthRequest.setXmwsSignature(getHeaderValOrEmpty(V1.authHeaderName)) // dreadful mutating type | ||
| mAuthRequest.setXmwsTime(getHeaderValOrEmpty(V1.timeHeaderName)) | ||
| mAuthRequest | ||
| } else mAuthRequest | ||
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| F.fromFuture(F.delay(authenticator.authenticate(req)(ec, requestValidationTimeout))) | ||
| } | ||
| }).flatMap(b => | ||
| if (b) http(request) | ||
| else logAndReturnDefaultUnauthorizedReq(s"Rejecting request as authentication failed") | ||
| ).recoverWith { case MdsolAuthMissingHeaderRejection(hn) => | ||
| logAndReturnDefaultUnauthorizedReq(s"Rejecting request as header $hn missing") | ||
| } | ||
| } | ||
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| def httpRoutes[F[_]: Async](requestValidationTimeout: Duration)(httpRoutes: HttpRoutes[F])(implicit | ||
| authenticator: Authenticator, | ||
| ec: ExecutionContext | ||
| ): HttpRoutes[F] = apply(requestValidationTimeout, OptionT.liftK[F])(httpRoutes) | ||
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| def httpApp[F[_]: Async](requestValidationTimeout: Duration)(httpRoutes: HttpApp[F])(implicit | ||
| authenticator: Authenticator, | ||
| ec: ExecutionContext | ||
| ): HttpApp[F] = apply(requestValidationTimeout, FunctionK.id[F])(httpRoutes) | ||
| } |
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