Core/Accounts: prevent existing account ban from being updated

Signed-off-by: jackpoz <giacomopoz@gmail.com>

sql/updates/world/3.3.5/2017_12_16_04_world.sql

@@ -0,0 +1,2 @@
+DELETE FROM `trinity_string` WHERE `entry`=1188;
+INSERT INTO `trinity_string` (`entry`, `content_default`) VALUES (1188, 'Ban exists');

src/server/game/Accounts/AccountMgr.cpp

@@ -390,6 +390,18 @@ std::string AccountMgr::CalculateShaPassHash(std::string const& name, std::strin
     return ByteArrayToHexStr(sha.GetDigest(), sha.GetLength());
 }
 
+bool AccountMgr::IsBannedAccount(std::string const& name)
+{
+    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_SEL_ACCOUNT_BANNED_BY_USERNAME);
+    stmt->setString(0, name);
+    PreparedQueryResult result = LoginDatabase.Query(stmt);
+
+    if (!result)
+        return false;
+
+    return true;
+}
+
 bool AccountMgr::IsPlayerAccount(uint32 gmlevel)
 {
     return gmlevel == SEC_PLAYER;

src/server/game/Accounts/AccountMgr.h

@@ -75,6 +75,7 @@ class TC_GAME_API AccountMgr
         static uint32 GetCharactersCount(uint32 accountId);
 
         static std::string CalculateShaPassHash(std::string const& name, std::string const& password);
+        static bool IsBannedAccount(std::string const& name);
         static bool IsPlayerAccount(uint32 gmlevel);
         static bool IsAdminAccount(uint32 gmlevel);
         static bool IsConsoleAccount(uint32 gmlevel);

src/server/game/Miscellaneous/Language.h

@@ -999,7 +999,8 @@ enum TrinityStrings
     LANG_GROUP_NOT_IN_RAID_GROUP        = 1185,
     LANG_GROUP_ROLE_CHANGED             = 1186,
     LANG_LEADER_CANNOT_BE_ASSISTANT     = 1187,
-    // Room for more level 3              1188-1198 not used
+    LANG_BAN_EXISTS                     = 1188,
+    // Room for more level 3              1189-1198 not used
 
     // Debug commands
     LANG_DO_NOT_USE_6X_DEBUG_AREATRIGGER_LEFT = 1999,

src/server/game/Miscellaneous/SharedDefines.h

@@ -3367,7 +3367,8 @@ enum BanReturn
 {
     BAN_SUCCESS,
     BAN_SYNTAX_ERROR,
-    BAN_NOTFOUND
+    BAN_NOTFOUND,
+    BAN_EXISTS
 };
 
 enum BattlegroundTeamId

src/server/game/World/World.cpp

@@ -2671,6 +2671,10 @@ BanReturn World::BanAccount(BanMode mode, std::string const& nameOrIP, uint32 du
     PreparedQueryResult resultAccounts = PreparedQueryResult(nullptr); //used for kicking
     PreparedStatement* stmt = nullptr;
 
+    // Prevent banning an already banned account
+    if (mode == BAN_ACCOUNT && AccountMgr::IsBannedAccount(nameOrIP))
+        return BAN_EXISTS;
+
     ///- Update the database with ban information
     switch (mode)
     {

src/server/scripts/Commands/cs_ban.cpp

@@ -233,6 +233,9 @@ public:
                 }
                 handler->SetSentErrorMessage(true);
                 return false;
+            case BAN_EXISTS:
+                handler->PSendSysMessage(LANG_BAN_EXISTS);
+                break;
         }
 
         return true;