def dataKeysList = summary[Data]()

in app/controllers/Api.scala [355:396]
38 lines of code
2 McCabe index (conditional complexity)

  def dataKeysList = summary[Data](
    prismDataStore.dataAgent,
    d => Some(Json.toJson(d.key)),
    "keys"
  )

  def dataLookup(key: String) = Action.async { implicit request =>
    ApiResult.filter {
      val app = request.getQueryString("app")
      val stage = request.getQueryString("stage")
      val stack = request.getQueryString("stack")
      val validKey =
        prismDataStore.dataAgent.getTuples.filter(_._2.key == key).toSeq

      val errors: Map[String, String] = Map.empty ++
        (if (app.isEmpty) Some("app" -> "Must specify app") else None) ++
        (if (stage.isEmpty) Some("stage" -> "Must specify stage") else None) ++
        (if (stage.isEmpty) Some("stack" -> "Must specify stack") else None) ++
        (if (validKey.isEmpty) Some("key" -> s"The key name $key was not found")
         else None) ++
        (if (validKey.size > 1)
           Some("key" -> s"The key name $key was matched multiple times")
         else None)

      if (errors.nonEmpty)
        throw ApiCallException(Json.toJson(errors).as[JsObject])

      val (label, data) = validKey.head
      data
        .firstMatchingData(stack.get, app.get, stage.get)
        .map(data => Map(label -> Seq(data)))
        .getOrElse {
          throw ApiCallException(
            Json.obj(
              "value" -> s"Key $key has no matching value for stack=$stack, app=$app and stage=$stage"
            )
          )
        }
    } reduce { result =>
      Json.toJson(result.head._2.head)
    }
  }