Fix missing risk challenge response

server/im_http.go

@@ -53,6 +53,7 @@ const (
 	imReasonUnsupportedMedia    = "UNSUPPORTED_MEDIA_TYPE"
 	imReasonFileUnavailable     = "FILE_UNAVAILABLE"
 	imReasonRateLimited         = "RATE_LIMITED"
+	imReasonResourceNotFound    = "RESOURCE_NOT_FOUND"
 )
 
 const (
@@ -1257,6 +1258,10 @@ func serveIMRiskChallengeConfirm(wrt http.ResponseWriter, req *http.Request) {
 	}
 	challenge, err := store.Safety.ConfirmRiskChallenge(principal.TenantID, principal.Uid, challengeID, decision, tokenID, time.Now().UTC().Round(time.Millisecond))
 	if err != nil {
+		if errors.Is(err, types.ErrNotFound) {
+			writeIMError(wrt, req, http.StatusNotFound, 30004, imReasonResourceNotFound, "risk challenge not found", nil)
+			return
+		}
 		writeIMRelationError(wrt, req, err)
 		return
 	}