Fix serialization for case number messages

thehive/app/org/thp/thehive/services/CaseNumber.scala

@@ -12,6 +12,7 @@ import org.thp.thehive.GuiceAkkaExtension
 import org.thp.thehive.services.CaseOps._
 
 import java.io.NotSerializableException
+import java.nio.ByteBuffer
 import javax.inject.{Inject, Provider, Singleton}
 
 object CaseNumberActor {
@@ -55,22 +56,15 @@ class CaseNumberSerializer(system: ExtendedActorSystem) extends Serializer {
   override def toBinary(o: AnyRef): Array[Byte] =
     o match {
       case GetNextNumber(replyTo) => 0.toByte +: actorRefResolver.toSerializationFormat(replyTo).getBytes
-      case NextNumber(number) =>
-        Array(1.toByte, ((number >> 24) % 0xff).toByte, ((number >> 16) % 0xff).toByte, ((number >> 8) % 0xff).toByte, (number % 0xff).toByte)
-      case _ => throw new NotSerializableException
+      case NextNumber(number)     => ByteBuffer.allocate(5).put(1.toByte).putInt(number).array()
+      case _                      => throw new NotSerializableException
     }
 
   override def includeManifest: Boolean = false
 
   override def fromBinary(bytes: Array[Byte], manifest: Option[Class[_]]): AnyRef =
     bytes(0) match {
       case 0 => GetNextNumber(actorRefResolver.resolveActorRef(new String(bytes.tail)))
-      case 1 =>
-        NextNumber(
-          (bytes(2) << 24) +
-            (bytes(3) << 16) +
-            (bytes(4) << 8) +
-            bytes(5)
-        )
+      case 1 => NextNumber(ByteBuffer.wrap(bytes).getInt(1))
     }
 }

thehive/test/org/thp/thehive/services/CaseNumberTest.scala

@@ -0,0 +1,34 @@
+package org.thp.thehive.services
+
+import akka.actor.ExtendedActorSystem
+import akka.actor.typed.ActorSystem
+import akka.actor.typed.scaladsl.Behaviors
+import org.thp.thehive.TestAppBuilder
+import play.api.test.PlaySpecification
+
+class CaseNumberTest extends PlaySpecification with TestAppBuilder {
+
+  "case number actor" should {
+    "serialize and deserialize messages" in withActorSystem { system =>
+      val ref = system.deadLetters[CaseNumberActor.Response]
+      val sut = new CaseNumberSerializer(system.classicSystem.asInstanceOf[ExtendedActorSystem])
+
+      val messages = Seq(
+        CaseNumberActor.GetNextNumber(ref),
+        CaseNumberActor.NextNumber(42),
+        CaseNumberActor.NextNumber(Int.MaxValue)
+      )
+      val out = messages.map(message => sut.toBinary(message))
+
+      val result = out.map(bin => sut.fromBinary(bin))
+
+      result must beEqualTo(messages)
+    }
+  }
+
+  private def withActorSystem[T](body: ActorSystem[Nothing] => T) = {
+    val system = ActorSystem(Behaviors.empty, "test")
+    try body(system)
+    finally system.terminate()
+  }
+}