1 files changed, 126 insertions, 0 deletions
diff --git a/src/main/scala/xyz/driver/core/rest.scala b/src/main/scala/xyz/driver/core/rest.scala
new file mode 100644
index 0000000..c615d99
--- /dev/null
+++ b/src/main/scala/xyz/driver/core/rest.scala
@@ -0,0 +1,126 @@
+package xyz.driver.core
+
+import akka.actor.ActorSystem
+import akka.http.scaladsl.Http
+import akka.http.scaladsl.model._
+import akka.http.scaladsl.model.headers.RawHeader
+import akka.http.scaladsl.unmarshalling.Unmarshal
+import akka.stream.ActorMaterializer
+import akka.stream.scaladsl.Flow
+import akka.util.ByteString
+import com.github.swagger.akka.model._
+import com.github.swagger.akka.{HasActorSystem, SwaggerHttpService}
+import com.typesafe.config.Config
+import xyz.driver.core.auth.{AuthService, AuthToken}
+import xyz.driver.core.crypto.Crypto
+import xyz.driver.core.logging.Logger
+import xyz.driver.core.stats.Stats
+import xyz.driver.core.time.TimeRange
+import xyz.driver.core.time.provider.TimeProvider
+
+import scala.concurrent.{ExecutionContext, Future}
+import scala.util.{Failure, Success}
+import scalaz.{Failure => _, Success => _}
+
+object rest {
+
+  trait Service
+
+  trait ServiceTransport {
+
+    def sendRequest(authToken: AuthToken)(requestStub: HttpRequest): Future[Unmarshal[ResponseEntity]]
+  }
+
+  trait ServiceDiscovery {
+
+    def discover[T <: Service](serviceName: Name[Service]): T
+  }
+
+  class HttpRestServiceTransport(actorSystem: ActorSystem, executionContext: ExecutionContext,
+                                 crypto: Crypto, log: Logger, stats: Stats, time: TimeProvider) extends ServiceTransport {
+
+    protected implicit val materializer = ActorMaterializer()(actorSystem)
+    protected implicit val execution = executionContext
+
+    def sendRequest(authToken: AuthToken)(requestStub: HttpRequest): Future[Unmarshal[ResponseEntity]] = {
+
+      val requestTime = time.currentTime()
+      val encryptionFlow = Flow[ByteString] map { bytes =>
+        ByteString(crypto.encrypt(crypto.keyForToken(authToken))(bytes.toArray))
+      }
+      val decryptionFlow = Flow[ByteString] map { bytes =>
+        ByteString(crypto.decrypt(crypto.keyForToken(authToken))(bytes.toArray))
+      }
+
+      val request = requestStub
+        .withEntity(requestStub.entity.transformDataBytes(encryptionFlow))
+        .withHeaders(
+          RawHeader(AuthService.AuthenticationTokenHeader, authToken.value.value))
+
+      log.audit(s"Sending to ${request.uri} request $request")
+
+      val responseEntity = Http()(actorSystem).singleRequest(request)(materializer) map { response =>
+        if(response.status == StatusCodes.NotFound) {
+          Unmarshal(HttpEntity.Empty: ResponseEntity)
+        } else if(response.status.isFailure()) {
+          throw new Exception("Http status is failure " + response.status)
+        } else {
+          Unmarshal(response.entity.transformDataBytes(decryptionFlow))
+        }
+      }
+
+      responseEntity.onComplete {
+        case Success(r) =>
+          val responseTime = time.currentTime()
+          log.audit(s"Response from ${request.uri} to request $requestStub is successful")
+          stats.recordStats(Seq("request", request.uri.toString, "success"), TimeRange(requestTime, responseTime), 1)
+
+        case Failure(t: Throwable) =>
+          val responseTime = time.currentTime()
+          log.audit(s"Failed to receive response from ${request.uri} to request $requestStub")
+          log.error(s"Failed to receive response from ${request.uri} to request $requestStub", t)
+          stats.recordStats(Seq("request", request.uri.toString, "fail"), TimeRange(requestTime, responseTime), 1)
+      } (executionContext)
+
+      responseEntity
+    }
+  }
+
+  import scala.reflect.runtime.universe._
+
+  class Swagger(override val host: String,
+                version: String,
+                override val actorSystem: ActorSystem,
+                override val apiTypes: Seq[Type],
+                val config: Config) extends SwaggerHttpService with HasActorSystem {
+
+    val materializer = ActorMaterializer()(actorSystem)
+
+    override val basePath = config.getString("swagger.basePath")
+    override val apiDocsPath = config.getString("swagger.docsPath")
+
+    override val info = Info(
+      config.getString("swagger.apiInfo.description"),
+      version,
+      config.getString("swagger.apiInfo.title"),
+      config.getString("swagger.apiInfo.termsOfServiceUrl"),
+      contact = Some(Contact(
+        config.getString("swagger.apiInfo.contact.name"),
+        config.getString("swagger.apiInfo.contact.url"),
+        config.getString("swagger.apiInfo.contact.email")
+      )),
+      license = Some(License(
+        config.getString("swagger.apiInfo.license"),
+        config.getString("swagger.apiInfo.licenseUrl")
+      )),
+      vendorExtensions = Map.empty[String, AnyRef])
+
+    def swaggerUI = get {
+      pathPrefix("") {
+        pathEndOrSingleSlash {
+          getFromResource("swagger-ui/index.html")
+        }
+      } ~ getFromResourceDirectory("swagger-ui")
+    }
+  }
+}