fix challenge accept API endpoint when challenge was canceled

app/controllers/Challenge.scala

@@ -132,7 +132,10 @@ final class Challenge(
         _.filter(isForMe(_, me.some)) match {
           case None                  => tryRematch
           case Some(c) if c.accepted => tryRematch
-          case Some(challenge)       => api.accept(challenge, me.some, none) inject jsonOkResult
+          case Some(c) =>
+            api.accept(c, me.some, none) map {
+              _.fold(BadRequest(_), _ => jsonOkResult)
+            }
         }
       }
     }

modules/challenge/src/main/Challenge.scala

@@ -72,6 +72,7 @@ case class Challenge(
   def openDest = destUser.isEmpty
   def online   = status == Status.Created
   def active   = online || status == Status.Offline
+  def canceled = status == Status.Canceled
   def declined = status == Status.Declined
   def accepted = status == Status.Accepted
 

modules/challenge/src/main/ChallengeApi.scala

@@ -89,7 +89,8 @@ final class ChallengeApi(
       color: Option[chess.Color] = None
   ): Fu[Validated[String, Option[Pov]]] =
     acceptQueue {
-      if (user.exists(_.isBot) && !Game.isBotCompatible(chess.Speed(c.clock.map(_.config))))
+      if (c.canceled) fuccess(Invalid("The challenge has been canceled."))
+      else if (user.exists(_.isBot) && !Game.isBotCompatible(chess.Speed(c.clock.map(_.config))))
         fuccess(Invalid("Game incompatible with a BOT account"))
       else if (c.challengerIsOpen)
         repo.setChallenger(c.setChallenger(user, sid), color) inject Valid(none)