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package xyz.driver.core.rest
import java.net.InetAddress
import akka.http.scaladsl.marshalling.{ToEntityMarshaller, ToResponseMarshallable}
import akka.http.scaladsl.model.headers._
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server._
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.Materializer
import akka.stream.scaladsl.Flow
import akka.util.ByteString
import xyz.driver.tracing.TracingDirectives
import scala.concurrent.Future
import scala.util.Try
import scalaz.{Functor, OptionT}
import scalaz.Scalaz.{intInstance, stringInstance}
import scalaz.syntax.equal._
trait Service
trait HttpClient {
def makeRequest(request: HttpRequest): Future[HttpResponse]
}
trait ServiceTransport {
def sendRequestGetResponse(context: ServiceRequestContext)(requestStub: HttpRequest): Future[HttpResponse]
def sendRequest(context: ServiceRequestContext)(requestStub: HttpRequest)(
implicit mat: Materializer): Future[Unmarshal[ResponseEntity]]
}
object Pagination {
val Default = Pagination(pageSize = 100, pageNumber = 1)
}
final case class Pagination(pageSize: Int, pageNumber: Int) {
def offset: Int = pageSize * pageNumber
}
object `package` {
implicit class OptionTRestAdditions[T](optionT: OptionT[Future, T]) {
def responseOrNotFound(successCode: StatusCodes.Success = StatusCodes.OK)(
implicit F: Functor[Future],
em: ToEntityMarshaller[T]): Future[ToResponseMarshallable] = {
optionT.fold[ToResponseMarshallable](successCode -> _, StatusCodes.NotFound -> None)
}
}
object ContextHeaders {
val AuthenticationTokenHeader: String = "Authorization"
val PermissionsTokenHeader: String = "Permissions"
val AuthenticationHeaderPrefix: String = "Bearer"
val TrackingIdHeader: String = "X-Trace"
val StacktraceHeader: String = "X-Stacktrace"
val OriginatingIpHeader: String = "X-Forwarded-For"
val ResourceCount: String = "X-Resource-Count"
val PageCount: String = "X-Page-Count"
val TraceHeaderName: String = TracingDirectives.TraceHeaderName
val SpanHeaderName: String = TracingDirectives.SpanHeaderName
}
object AuthProvider {
val AuthenticationTokenHeader: String = ContextHeaders.AuthenticationTokenHeader
val PermissionsTokenHeader: String = ContextHeaders.PermissionsTokenHeader
val SetAuthenticationTokenHeader: String = "set-authorization"
val SetPermissionsTokenHeader: String = "set-permissions"
}
val AllowedHeaders: Seq[String] =
Seq(
"Origin",
"X-Requested-With",
"Content-Type",
"Content-Length",
"Accept",
"X-Trace",
"X-Client-Fingerprint",
"Access-Control-Allow-Methods",
"Access-Control-Allow-Origin",
"Access-Control-Allow-Headers",
"Server",
"Date",
ContextHeaders.TrackingIdHeader,
ContextHeaders.TraceHeaderName,
ContextHeaders.SpanHeaderName,
ContextHeaders.StacktraceHeader,
ContextHeaders.AuthenticationTokenHeader,
ContextHeaders.OriginatingIpHeader,
ContextHeaders.ResourceCount,
ContextHeaders.PageCount,
"X-Frame-Options",
"X-Content-Type-Options",
"Strict-Transport-Security",
AuthProvider.SetAuthenticationTokenHeader,
AuthProvider.SetPermissionsTokenHeader
)
def allowOrigin(originHeader: Option[Origin]): `Access-Control-Allow-Origin` =
`Access-Control-Allow-Origin`(
originHeader.fold[HttpOriginRange](HttpOriginRange.*)(h => HttpOriginRange(h.origins: _*)))
def serviceContext: Directive1[ServiceRequestContext] = {
extractClientIP flatMap { remoteAddress =>
extract(ctx => extractServiceContext(ctx.request, remoteAddress))
}
}
def respondWithCorsAllowedHeaders: Directive0 = {
respondWithHeaders(
List[HttpHeader](
`Access-Control-Allow-Headers`(AllowedHeaders: _*),
`Access-Control-Expose-Headers`(AllowedHeaders: _*)
))
}
def respondWithCorsAllowedOriginHeaders(origin: Origin): Directive0 = {
respondWithHeader {
`Access-Control-Allow-Origin`(HttpOriginRange(origin.origins: _*))
}
}
def respondWithCorsAllowedMethodHeaders(methods: Set[HttpMethod]): Directive0 = {
respondWithHeaders(
List[HttpHeader](
Allow(methods.to[collection.immutable.Seq]),
`Access-Control-Allow-Methods`(methods.to[collection.immutable.Seq])
))
}
def extractServiceContext(request: HttpRequest, remoteAddress: RemoteAddress): ServiceRequestContext =
new ServiceRequestContext(
extractTrackingId(request),
extractOriginatingIP(request, remoteAddress),
extractContextHeaders(request))
def extractTrackingId(request: HttpRequest): String = {
request.headers
.find(_.name === ContextHeaders.TrackingIdHeader)
.fold(java.util.UUID.randomUUID.toString)(_.value())
}
def extractOriginatingIP(request: HttpRequest, remoteAddress: RemoteAddress): Option[InetAddress] = {
request.headers
.find(_.name === ContextHeaders.OriginatingIpHeader)
.flatMap(ipName => Try(InetAddress.getByName(ipName.value)).toOption)
.orElse(remoteAddress.toOption)
}
def extractStacktrace(request: HttpRequest): Array[String] =
request.headers.find(_.name == ContextHeaders.StacktraceHeader).fold("")(_.value()).split("->")
def extractContextHeaders(request: HttpRequest): Map[String, String] = {
request.headers.filter { h =>
h.name === ContextHeaders.AuthenticationTokenHeader || h.name === ContextHeaders.TrackingIdHeader ||
h.name === ContextHeaders.PermissionsTokenHeader || h.name === ContextHeaders.StacktraceHeader ||
h.name === ContextHeaders.TraceHeaderName || h.name === ContextHeaders.SpanHeaderName ||
h.name === ContextHeaders.OriginatingIpHeader
} map { header =>
if (header.name === ContextHeaders.AuthenticationTokenHeader) {
header.name -> header.value.stripPrefix(ContextHeaders.AuthenticationHeaderPrefix).trim
} else {
header.name -> header.value
}
} toMap
}
private[rest] def escapeScriptTags(byteString: ByteString): ByteString = {
@annotation.tailrec
def dirtyIndices(from: Int, descIndices: List[Int]): List[Int] = {
val index = byteString.indexOf('/', from)
if (index === -1) descIndices.reverse
else {
val (init, tail) = byteString.splitAt(index)
if ((init endsWith "<") && (tail startsWith "/sc")) {
dirtyIndices(index + 1, index :: descIndices)
} else {
dirtyIndices(index + 1, descIndices)
}
}
}
val indices = dirtyIndices(0, Nil)
indices.headOption.fold(byteString) { head =>
val builder = ByteString.newBuilder
builder ++= byteString.take(head)
(indices :+ byteString.length).sliding(2).foreach {
case Seq(start, end) =>
builder += ' '
builder ++= byteString.slice(start, end)
case Seq(_) => // Should not match; sliding on at least 2 elements
assert(indices.nonEmpty, s"Indices should have been nonEmpty: $indices")
}
builder.result
}
}
val sanitizeRequestEntity: Directive0 = {
mapRequest(request => request.mapEntity(entity => entity.transformDataBytes(Flow.fromFunction(escapeScriptTags))))
}
}
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