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package xyz.driver.core
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.model.headers.{HttpChallenges, RawHeader}
import akka.http.scaladsl.server.AuthenticationFailedRejection.CredentialsRejected
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.ActorMaterializer
import com.github.swagger.akka.model._
import com.github.swagger.akka.{HasActorSystem, SwaggerHttpService}
import com.typesafe.config.Config
import io.swagger.models.Scheme
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.OptionT
import scalaz.Scalaz.{Id => _, _}
object rest {
final case class ServiceRequestContext(
trackingId: String = generators.nextUuid().toString,
contextHeaders: Map[String, String] = Map.empty[String, String]) {
def authToken: Option[Auth.AuthToken] =
contextHeaders.get(Auth.AuthProvider.AuthenticationTokenHeader).map(Auth.AuthToken.apply)
}
object ServiceRequestContext {
object ContextHeaders {
val AuthenticationTokenHeader = "WWW-Authenticate"
val TrackingIdHeader = "X-Trace"
object LinkerD {
// https://linkerd.io/doc/0.7.4/linkerd/protocol-http/
def isLinkerD(headerName: String) = headerName.startsWith("l5d-")
}
}
import akka.http.scaladsl.server._
import Directives._
def serviceContext: Directive1[ServiceRequestContext] = extract(ctx => extractServiceContext(ctx))
def extractServiceContext(ctx: RequestContext): ServiceRequestContext =
ServiceRequestContext(extractTrackingId(ctx), extractContextHeaders(ctx))
def extractTrackingId(ctx: RequestContext): String = {
ctx.request.headers
.find(_.name == ContextHeaders.TrackingIdHeader)
.fold(java.util.UUID.randomUUID.toString)(_.value())
}
def extractContextHeaders(ctx: RequestContext): Map[String, String] = {
ctx.request.headers.filter { h =>
h.name === ContextHeaders.AuthenticationTokenHeader || h.name === ContextHeaders.TrackingIdHeader
// || ContextHeaders.LinkerD.isLinkerD(h.lowercaseName)
} map { header =>
header.name -> header.value
} toMap
}
}
object Auth {
trait Permission
trait Role {
val id: Id[Role]
val name: Name[Role]
val permissions: Set[Permission]
def hasPermission(permission: Permission): Boolean = permissions.contains(permission)
}
trait User {
def id: Id[User]
def roles: Set[Role]
def permissions: Set[Permission] = roles.flatMap(_.permissions)
}
final case class BasicUser(id: Id[User], roles: Set[Role]) extends User
final case class AuthToken(value: String)
final case class PasswordHash(value: String)
object AuthProvider {
val AuthenticationTokenHeader = ServiceRequestContext.ContextHeaders.AuthenticationTokenHeader
val SetAuthenticationTokenHeader = "set-authorization"
}
trait AuthProvider[U <: User] {
import akka.http.scaladsl.server._
import Directives._
/**
* Specific implementation on how to extract user from request context,
* can either need to do a network call to auth server or extract everything from self-contained token
*
* @param context set of request values which can be relevant to authenticate user
* @return authenticated user
*/
protected def authenticatedUser(context: ServiceRequestContext): OptionT[Future, U]
def authorize(permissions: Permission*): Directive1[U] = {
ServiceRequestContext.serviceContext flatMap { ctx =>
onComplete(authenticatedUser(ctx).run).flatMap {
case Success(Some(user)) =>
if (permissions.forall(user.permissions.contains)) provide(user)
else {
val challenge =
HttpChallenges.basic(s"User does not have the required permissions: ${permissions.mkString(", ")}")
reject(AuthenticationFailedRejection(CredentialsRejected, challenge))
}
case Success(None) =>
reject(ValidationRejection(s"Wasn't able to find authenticated user for the token provided"))
case Failure(t) =>
reject(ValidationRejection(s"Wasn't able to verify token for authenticated user", Some(t)))
}
}
}
}
}
trait Service
trait ServiceTransport {
def sendRequest(context: ServiceRequestContext)(requestStub: HttpRequest): Future[Unmarshal[ResponseEntity]]
}
trait ServiceDiscovery {
def discover[T <: Service](serviceName: Name[Service]): T
}
class HttpRestServiceTransport(actorSystem: ActorSystem, executionContext: ExecutionContext,
log: Logger, stats: Stats, time: TimeProvider) extends ServiceTransport {
protected implicit val materializer = ActorMaterializer()(actorSystem)
protected implicit val execution = executionContext
def sendRequest(context: ServiceRequestContext)(requestStub: HttpRequest): Future[Unmarshal[ResponseEntity]] = {
val requestTime = time.currentTime()
val request = requestStub
.withHeaders(RawHeader(ServiceRequestContext.ContextHeaders.TrackingIdHeader, context.trackingId))
.withHeaders(context.contextHeaders.toSeq.map { h => RawHeader(h._1, h._2): HttpHeader }: _*)
log.audit(s"Sending to ${request.uri} request $request with tracking id ${context.trackingId}")
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(s"Http status is failure ${response.status}")
} else {
Unmarshal(response.entity)
}
}
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,
override val scheme: Scheme,
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")
}
}
}
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