From 5860869dd75a6f94d94a79c35349433020332404 Mon Sep 17 00:00:00 2001
From: klim0v <klim0v-sergey@yandex.ru>
Date: Wed, 23 Sep 2020 14:15:26 +0300
Subject: [PATCH] check public key exists for EditCandidatePublicKeyData

---
 core/transaction/edit_candidate_public_key.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/transaction/edit_candidate_public_key.go b/core/transaction/edit_candidate_public_key.go
index 6a8b9ecfc..b19440c51 100644
--- a/core/transaction/edit_candidate_public_key.go
+++ b/core/transaction/edit_candidate_public_key.go
@@ -56,6 +56,14 @@ func (data EditCandidatePublicKeyData) Run(tx *Transaction, context state.Interf
 		}
 	}
 
+	if checkState.Candidates().Exists(data.NewPubKey) {
+		return Response{
+			Code: code.CandidateExists,
+			Log:  fmt.Sprintf("Candidate with such public key (%s) already exists", data.NewPubKey.String()),
+			Info: EncodeError(code.NewCandidateExists(data.NewPubKey.String())),
+		}
+	}
+
 	commissionInBaseCoin := tx.CommissionInBaseCoin()
 	commission := big.NewInt(0).Set(commissionInBaseCoin)