src/game/TradeHandler.cpp

   1 /*
   2  * Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "Common.h"
  20 #include "WorldPacket.h"
  21 #include "WorldSession.h"
  22 #include "World.h"
  23 #include "ObjectAccessor.h"
  24 #include "Log.h"
  25 #include "Opcodes.h"
  26 #include "Player.h"
  27 #include "Item.h"
  28 #include "SocialMgr.h"
  29 #include "Language.h"
  30
  31 enum TradeStatus
  32 {
  33     TRADE_STATUS_BUSY           = 0,
  34     TRADE_STATUS_BEGIN_TRADE    = 1,
  35     TRADE_STATUS_OPEN_WINDOW    = 2,
  36     TRADE_STATUS_TRADE_CANCELED = 3,
  37     TRADE_STATUS_TRADE_ACCEPT   = 4,
  38     TRADE_STATUS_BUSY_2         = 5,
  39     TRADE_STATUS_NO_TARGET      = 6,
  40     TRADE_STATUS_BACK_TO_TRADE  = 7,
  41     TRADE_STATUS_TRADE_COMPLETE = 8,
  42     // 9?
  43     TRADE_STATUS_TARGET_TO_FAR  = 10,
  44     TRADE_STATUS_WRONG_FACTION  = 11,
  45     TRADE_STATUS_CLOSE_WINDOW   = 12,
  46     // 13?
  47     TRADE_STATUS_IGNORE_YOU     = 14,
  48     TRADE_STATUS_YOU_STUNNED    = 15,
  49     TRADE_STATUS_TARGET_STUNNED = 16,
  50     TRADE_STATUS_YOU_DEAD       = 17,
  51     TRADE_STATUS_TARGET_DEAD    = 18,
  52     TRADE_STATUS_YOU_LOGOUT     = 19,
  53     TRADE_STATUS_TARGET_LOGOUT  = 20,
  54     TRADE_STATUS_TRIAL_ACCOUNT  = 21,                       // Trial accounts can not perform that action
  55     TRADE_STATUS_ONLY_CONJURED  = 22                        // You can only trade conjured items... (cross realm BG related).
  56 };
  57
  58 void WorldSession::SendTradeStatus(uint32 status)
  59 {
  60     WorldPacket data;
  61
  62     switch(status)
  63     {
  64         case TRADE_STATUS_BEGIN_TRADE:
  65             data.Initialize(SMSG_TRADE_STATUS, 4+8);
  66             data << uint32(status);
  67             data << uint64(0);
  68             break;
  69         case TRADE_STATUS_OPEN_WINDOW:
  70             data.Initialize(SMSG_TRADE_STATUS, 4+4);
  71             data << uint32(status);
  72             data << uint32(0);                              // added in 2.4.0
  73             break;
  74         case TRADE_STATUS_CLOSE_WINDOW:
  75             data.Initialize(SMSG_TRADE_STATUS, 4+4+1+4);
  76             data << uint32(status);
  77             data << uint32(0);
  78             data << uint8(0);
  79             data << uint32(0);
  80             break;
  81         case TRADE_STATUS_ONLY_CONJURED:
  82             data.Initialize(SMSG_TRADE_STATUS, 4+1);
  83             data << uint32(status);
  84             data << uint8(0);
  85             break;
  86         default:
  87             data.Initialize(SMSG_TRADE_STATUS, 4);
  88             data << uint32(status);
  89             break;
  90     }
  91
  92     SendPacket(&data);
  93 }
  94
  95 void WorldSession::HandleIgnoreTradeOpcode(WorldPacket& /*recvPacket*/)
  96 {
  97     sLog.outDebug( "WORLD: Ignore Trade %u",_player->GetGUIDLow());
  98     // recvPacket.print_storage();
  99 }
 100
 101 void WorldSession::HandleBusyTradeOpcode(WorldPacket& /*recvPacket*/)
 102 {
 103     sLog.outDebug( "WORLD: Busy Trade %u",_player->GetGUIDLow());
 104     // recvPacket.print_storage();
 105 }
 106
 107 void WorldSession::SendUpdateTrade()
 108 {
 109     Item *item = NULL;
 110
 111     if( !_player || !_player->pTrader )
 112         return;
 113
 114     // reset trade status
 115     if (_player->acceptTrade)
 116     {
 117         _player->acceptTrade = false;
 118         SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 119     }
 120
 121     if (_player->pTrader->acceptTrade)
 122     {
 123         _player->pTrader->acceptTrade = false;
 124         _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 125     }
 126
 127     WorldPacket data(SMSG_TRADE_STATUS_EXTENDED, (100));    // guess size
 128     data << (uint8 ) 1;                                     // can be different (only seen 0 and 1)
 129     data << (uint32) 0;                                     // added in 2.4.0, this value must be equal to value from TRADE_STATUS_OPEN_WINDOW status packet (different value for different players to block multiple trades?)
 130     data << (uint32) TRADE_SLOT_COUNT;                      // trade slots count/number?, = next field in most cases
 131     data << (uint32) TRADE_SLOT_COUNT;                      // trade slots count/number?, = prev field in most cases
 132     data << (uint32) _player->pTrader->tradeGold;           // trader gold
 133     data << (uint32) 0;                                     // spell casted on lowest slot item
 134
 135     for(uint8 i = 0; i < TRADE_SLOT_COUNT; i++)
 136     {
 137         item = (_player->pTrader->tradeItems[i] != NULL_SLOT ? _player->pTrader->GetItemByPos( _player->pTrader->tradeItems[i] ) : NULL);
 138
 139         data << (uint8) i;                                  // trade slot number, if not specified, then end of packet
 140
 141         if(item)
 142         {
 143             data << (uint32) item->GetProto()->ItemId;      // entry
 144                                                             // display id
 145             data << (uint32) item->GetProto()->DisplayInfoID;
 146                                                             // stack count
 147             data << (uint32) item->GetUInt32Value(ITEM_FIELD_STACK_COUNT);
 148             data << (uint32) 0;                             // probably gift=1, created_by=0?
 149                                                             // gift creator
 150             data << (uint64) item->GetUInt64Value(ITEM_FIELD_GIFTCREATOR);
 151             data << (uint32) item->GetEnchantmentId(PERM_ENCHANTMENT_SLOT);
 152             for(uint8 j = 0; j < 3; ++j)
 153                 data << (uint32) 0;                         // enchantment id (permanent/gems?)
 154                                                             // creator
 155             data << (uint64) item->GetUInt64Value(ITEM_FIELD_CREATOR);
 156             data << (uint32) item->GetSpellCharges();       // charges
 157             data << (uint32) item->GetItemSuffixFactor();   // SuffixFactor
 158                                                             // random properties id
 159             data << (uint32) item->GetItemRandomPropertyId();
 160             data << (uint32) item->GetProto()->LockID;      // lock id
 161                                                             // max durability
 162             data << (uint32) item->GetUInt32Value(ITEM_FIELD_MAXDURABILITY);
 163                                                             // durability
 164             data << (uint32) item->GetUInt32Value(ITEM_FIELD_DURABILITY);
 165         }
 166         else
 167         {
 168             for(uint8 j = 0; j < 18; j++)
 169                 data << uint32(0);
 170         }
 171     }
 172     SendPacket(&data);
 173 }
 174
 175 //==============================================================
 176 // transfer the items to the players
 177
 178 void WorldSession::moveItems(Item* myItems[], Item* hisItems[])
 179 {
 180     for(int i=0; i<TRADE_SLOT_TRADED_COUNT; i++)
 181     {
 182         ItemPosCountVec traderDst;
 183         ItemPosCountVec playerDst;
 184         bool traderCanTrade = (myItems[i]==NULL || _player->pTrader->CanStoreItem( NULL_BAG, NULL_SLOT, traderDst, myItems[i], false ) == EQUIP_ERR_OK);
 185         bool playerCanTrade = (hisItems[i]==NULL || _player->CanStoreItem( NULL_BAG, NULL_SLOT, playerDst, hisItems[i], false ) == EQUIP_ERR_OK);
 186         if(traderCanTrade && playerCanTrade )
 187         {
 188             // Ok, if trade item exists and can be stored
 189             // If we trade in both directions we had to check, if the trade will work before we actually do it
 190             // A roll back is not possible after we stored it
 191             if(myItems[i])
 192             {
 193                 // logging
 194                 sLog.outDebug("partner storing: %u",myItems[i]->GetGUIDLow());
 195                 if( _player->GetSession()->GetSecurity() > SEC_PLAYER && sWorld.getConfig(CONFIG_GM_LOG_TRADE) )
 196                     sLog.outCommand("GM %s (Account: %u) trade: %s (Entry: %d Count: %u) to player: %s (Account: %u)",
 197                         _player->GetName(),_player->GetSession()->GetAccountId(),
 198                         myItems[i]->GetProto()->Name1,myItems[i]->GetEntry(),myItems[i]->GetCount(),
 199                         _player->pTrader->GetName(),_player->pTrader->GetSession()->GetAccountId());
 200
 201                 // store
 202                 _player->pTrader->MoveItemToInventory( traderDst, myItems[i], true, true);
 203             }
 204             if(hisItems[i])
 205             {
 206                 // logging
 207                 sLog.outDebug("player storing: %u",hisItems[i]->GetGUIDLow());
 208                 if( _player->pTrader->GetSession()->GetSecurity() > SEC_PLAYER && sWorld.getConfig(CONFIG_GM_LOG_TRADE) )
 209                     sLog.outCommand("GM %s (Account: %u) trade: %s (Entry: %d Count: %u) to player: %s (Account: %u)",
 210                         _player->pTrader->GetName(),_player->pTrader->GetSession()->GetAccountId(),
 211                         hisItems[i]->GetProto()->Name1,hisItems[i]->GetEntry(),hisItems[i]->GetCount(),
 212                         _player->GetName(),_player->GetSession()->GetAccountId());
 213
 214                 // store
 215                 _player->MoveItemToInventory( playerDst, hisItems[i], true, true);
 216             }
 217         }
 218         else
 219         {
 220             // in case of fatal error log error message
 221             // return the already removed items to the original owner
 222             if(myItems[i])
 223             {
 224                 if(!traderCanTrade)
 225                     sLog.outError("trader can't store item: %u",myItems[i]->GetGUIDLow());
 226                 if(_player->CanStoreItem( NULL_BAG, NULL_SLOT, playerDst, myItems[i], false ) == EQUIP_ERR_OK)
 227                     _player->MoveItemToInventory(playerDst, myItems[i], true, true);
 228                 else
 229                     sLog.outError("player can't take item back: %u",myItems[i]->GetGUIDLow());
 230             }
 231             // return the already removed items to the original owner
 232             if(hisItems[i])
 233             {
 234                 if(!playerCanTrade)
 235                     sLog.outError("player can't store item: %u",hisItems[i]->GetGUIDLow());
 236                 if(_player->pTrader->CanStoreItem( NULL_BAG, NULL_SLOT, traderDst, hisItems[i], false ) == EQUIP_ERR_OK)
 237                     _player->pTrader->MoveItemToInventory(traderDst, hisItems[i], true, true);
 238                 else
 239                     sLog.outError("trader can't take item back: %u",hisItems[i]->GetGUIDLow());
 240             }
 241         }
 242     }
 243 }
 244
 245 //==============================================================
 246
 247 void WorldSession::HandleAcceptTradeOpcode(WorldPacket& /*recvPacket*/)
 248 {
 249     Item *myItems[TRADE_SLOT_TRADED_COUNT]  = { NULL, NULL, NULL, NULL, NULL, NULL };
 250     Item *hisItems[TRADE_SLOT_TRADED_COUNT] = { NULL, NULL, NULL, NULL, NULL, NULL };
 251     bool myCanCompleteTrade=true,hisCanCompleteTrade=true;
 252
 253     if ( !GetPlayer()->pTrader )
 254         return;
 255
 256     // not accept case incorrect money amount
 257     if( _player->tradeGold > _player->GetMoney() )
 258     {
 259         SendNotification(LANG_NOT_ENOUGH_GOLD);
 260         _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 261         _player->acceptTrade = false;
 262         return;
 263     }
 264
 265     // not accept case incorrect money amount
 266     if( _player->pTrader->tradeGold > _player->pTrader->GetMoney() )
 267     {
 268         _player->pTrader->GetSession( )->SendNotification(LANG_NOT_ENOUGH_GOLD);
 269         SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 270         _player->pTrader->acceptTrade = false;
 271         return;
 272     }
 273
 274     // not accept if some items now can't be trade (cheating)
 275     for(int i=0; i<TRADE_SLOT_TRADED_COUNT; i++)
 276     {
 277         if(_player->tradeItems[i] != NULL_SLOT )
 278         {
 279             if(Item* item  =_player->GetItemByPos( _player->tradeItems[i] ))
 280             {
 281                 if(!item->CanBeTraded())
 282                 {
 283                     SendTradeStatus(TRADE_STATUS_TRADE_CANCELED);
 284                     return;
 285                 }
 286             }
 287         }
 288         if(_player->pTrader->tradeItems[i] != NULL_SLOT)
 289         {
 290             if(Item* item  =_player->pTrader->GetItemByPos( _player->pTrader->tradeItems[i]) )
 291             {
 292                 if(!item->CanBeTraded())
 293                 {
 294                     SendTradeStatus(TRADE_STATUS_TRADE_CANCELED);
 295                     return;
 296                 }
 297             }
 298         }
 299     }
 300
 301     _player->acceptTrade = true;
 302     if (_player->pTrader->acceptTrade )
 303     {
 304         // inform partner client
 305         _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_TRADE_ACCEPT);
 306
 307         // store items in local list and set 'in-trade' flag
 308         for(int i=0; i<TRADE_SLOT_TRADED_COUNT; i++)
 309         {
 310             if(_player->tradeItems[i] != NULL_SLOT )
 311             {
 312                 sLog.outDebug("player trade item bag: %u slot: %u",_player->tradeItems[i] >> 8, _player->tradeItems[i] & 255 );
 313                                                             //Can return NULL
 314                 myItems[i]=_player->GetItemByPos( _player->tradeItems[i] );
 315                 if (myItems[i])
 316                     myItems[i]->SetInTrade();
 317             }
 318             if(_player->pTrader->tradeItems[i] != NULL_SLOT)
 319             {
 320                 sLog.outDebug("partner trade item bag: %u slot: %u",_player->pTrader->tradeItems[i] >> 8,_player->pTrader->tradeItems[i] & 255);
 321                                                             //Can return NULL
 322                 hisItems[i]=_player->pTrader->GetItemByPos( _player->pTrader->tradeItems[i]);
 323                 if(hisItems[i])
 324                     hisItems[i]->SetInTrade();
 325             }
 326         }
 327
 328         // test if item will fit in each inventory
 329         hisCanCompleteTrade =  (_player->pTrader->CanStoreItems( myItems,TRADE_SLOT_TRADED_COUNT )== EQUIP_ERR_OK);
 330         myCanCompleteTrade = (_player->CanStoreItems( hisItems,TRADE_SLOT_TRADED_COUNT ) == EQUIP_ERR_OK);
 331
 332         // clear 'in-trade' flag
 333         for(int i=0; i<TRADE_SLOT_TRADED_COUNT; i++)
 334         {
 335             if(myItems[i])  myItems[i]->SetInTrade(false);
 336             if(hisItems[i]) hisItems[i]->SetInTrade(false);
 337         }
 338
 339         // in case of missing space report error
 340         if(!myCanCompleteTrade)
 341         {
 342             SendNotification(LANG_NOT_FREE_TRADE_SLOTS);
 343             GetPlayer( )->pTrader->GetSession( )->SendNotification(LANG_NOT_PARTNER_FREE_TRADE_SLOTS);
 344             SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 345             _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 346             return;
 347         }
 348         else if (!hisCanCompleteTrade)
 349         {
 350             SendNotification(LANG_NOT_PARTNER_FREE_TRADE_SLOTS);
 351             GetPlayer()->pTrader->GetSession()->SendNotification(LANG_NOT_FREE_TRADE_SLOTS);
 352             SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 353             _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 354             return;
 355         }
 356
 357         // execute trade: 1. remove
 358         for(int i=0; i<TRADE_SLOT_TRADED_COUNT; i++)
 359         {
 360             if(myItems[i])
 361             {
 362                 myItems[i]->SetUInt64Value( ITEM_FIELD_GIFTCREATOR,_player->GetGUID());
 363                 _player->MoveItemFromInventory(_player->tradeItems[i] >> 8, _player->tradeItems[i] & 255, true);
 364             }
 365             if(hisItems[i])
 366             {
 367                 hisItems[i]->SetUInt64Value( ITEM_FIELD_GIFTCREATOR,_player->pTrader->GetGUID());
 368                 _player->pTrader->MoveItemFromInventory(_player->pTrader->tradeItems[i] >> 8, _player->pTrader->tradeItems[i] & 255, true);
 369             }
 370         }
 371
 372         // execute trade: 2. store
 373         moveItems(myItems, hisItems);
 374
 375         // logging money
 376         if(sWorld.getConfig(CONFIG_GM_LOG_TRADE))
 377         {
 378             if( _player->GetSession()->GetSecurity() > SEC_PLAYER && _player->tradeGold > 0)
 379                 sLog.outCommand("GM %s (Account: %u) give money (Amount: %u) to player: %s (Account: %u)",
 380                     _player->GetName(),_player->GetSession()->GetAccountId(),
 381                     _player->tradeGold,
 382                     _player->pTrader->GetName(),_player->pTrader->GetSession()->GetAccountId());
 383             if( _player->pTrader->GetSession()->GetSecurity() > SEC_PLAYER && _player->pTrader->tradeGold > 0)
 384                 sLog.outCommand("GM %s (Account: %u) give money (Amount: %u) to player: %s (Account: %u)",
 385                     _player->pTrader->GetName(),_player->pTrader->GetSession()->GetAccountId(),
 386                     _player->pTrader->tradeGold,
 387                     _player->GetName(),_player->GetSession()->GetAccountId());
 388         }
 389
 390         // update money
 391         _player->ModifyMoney( -int32(_player->tradeGold) );
 392         _player->ModifyMoney(_player->pTrader->tradeGold );
 393         _player->pTrader->ModifyMoney( -int32(_player->pTrader->tradeGold) );
 394         _player->pTrader->ModifyMoney(_player->tradeGold );
 395
 396         _player->ClearTrade();
 397         _player->pTrader->ClearTrade();
 398
 399         // desynchronized with the other saves here (SaveInventoryAndGoldToDB() not have own transaction guards)
 400         CharacterDatabase.BeginTransaction();
 401         _player->SaveInventoryAndGoldToDB();
 402         _player->pTrader->SaveInventoryAndGoldToDB();
 403         CharacterDatabase.CommitTransaction();
 404
 405         _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_TRADE_COMPLETE);
 406         SendTradeStatus(TRADE_STATUS_TRADE_COMPLETE);
 407
 408         _player->pTrader->pTrader = NULL;
 409         _player->pTrader = NULL;
 410     }
 411     else
 412     {
 413         _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_TRADE_ACCEPT);
 414     }
 415 }
 416
 417 void WorldSession::HandleUnacceptTradeOpcode(WorldPacket& /*recvPacket*/)
 418 {
 419     if ( !GetPlayer()->pTrader )
 420         return;
 421
 422     _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_BACK_TO_TRADE);
 423     _player->acceptTrade = false;
 424 }
 425
 426 void WorldSession::HandleBeginTradeOpcode(WorldPacket& /*recvPacket*/)
 427 {
 428     if(!_player->pTrader)
 429         return;
 430
 431     _player->pTrader->GetSession()->SendTradeStatus(TRADE_STATUS_OPEN_WINDOW);
 432     _player->pTrader->ClearTrade();
 433
 434     SendTradeStatus(TRADE_STATUS_OPEN_WINDOW);
 435     _player->ClearTrade();
 436 }
 437
 438 void WorldSession::SendCancelTrade()
 439 {
 440     SendTradeStatus(TRADE_STATUS_TRADE_CANCELED);
 441 }
 442
 443 void WorldSession::HandleCancelTradeOpcode(WorldPacket& /*recvPacket*/)
 444 {
 445     // sended also after LOGOUT COMPLETE
 446     if(_player)                                             // needed because STATUS_AUTHED
 447         _player->TradeCancel(true);
 448 }
 449
 450 void WorldSession::HandleInitiateTradeOpcode(WorldPacket& recvPacket)
 451 {
 452     CHECK_PACKET_SIZE(recvPacket,8);
 453
 454     if( GetPlayer()->pTrader )
 455         return;
 456
 457     uint64 ID;
 458
 459     if( !GetPlayer()->isAlive() )
 460     {
 461         SendTradeStatus(TRADE_STATUS_YOU_DEAD);
 462         return;
 463     }
 464
 465     if( GetPlayer()->hasUnitState(UNIT_STAT_STUNNED) )
 466     {
 467         SendTradeStatus(TRADE_STATUS_YOU_STUNNED);
 468         return;
 469     }
 470
 471     if( isLogingOut() )
 472     {
 473         SendTradeStatus(TRADE_STATUS_YOU_LOGOUT);
 474         return;
 475     }
 476
 477     if( GetPlayer()->isInFlight() )
 478     {
 479         SendTradeStatus(TRADE_STATUS_TARGET_TO_FAR);
 480         return;
 481     }
 482
 483     recvPacket >> ID;
 484
 485     Player* pOther = ObjectAccessor::FindPlayer( ID );
 486
 487     if( !pOther )
 488     {
 489         SendTradeStatus(TRADE_STATUS_NO_TARGET);
 490         return;
 491     }
 492
 493     if( pOther == GetPlayer() || pOther->pTrader )
 494     {
 495         SendTradeStatus(TRADE_STATUS_BUSY);
 496         return;
 497     }
 498
 499     if( !pOther->isAlive() )
 500     {
 501         SendTradeStatus(TRADE_STATUS_TARGET_DEAD);
 502         return;
 503     }
 504
 505     if( pOther->isInFlight() )
 506     {
 507         SendTradeStatus(TRADE_STATUS_TARGET_TO_FAR);
 508         return;
 509     }
 510
 511     if( pOther->hasUnitState(UNIT_STAT_STUNNED) )
 512     {
 513         SendTradeStatus(TRADE_STATUS_TARGET_STUNNED);
 514         return;
 515     }
 516
 517     if( pOther->GetSession()->isLogingOut() )
 518     {
 519         SendTradeStatus(TRADE_STATUS_TARGET_LOGOUT);
 520         return;
 521     }
 522
 523     if( pOther->GetSocial()->HasIgnore(GetPlayer()->GetGUIDLow()) )
 524     {
 525         SendTradeStatus(TRADE_STATUS_IGNORE_YOU);
 526         return;
 527     }
 528
 529     if(pOther->GetTeam() !=_player->GetTeam() )
 530     {
 531         SendTradeStatus(TRADE_STATUS_WRONG_FACTION);
 532         return;
 533     }
 534
 535     if( pOther->GetDistance2d( _player ) > 10.0f )
 536     {
 537         SendTradeStatus(TRADE_STATUS_TARGET_TO_FAR);
 538         return;
 539     }
 540
 541     // OK start trade
 542     _player->pTrader = pOther;
 543     pOther->pTrader =_player;
 544
 545     WorldPacket data(SMSG_TRADE_STATUS, 12);
 546     data << (uint32) TRADE_STATUS_BEGIN_TRADE;
 547     data << (uint64)_player->GetGUID();
 548     _player->pTrader->GetSession()->SendPacket(&data);
 549 }
 550
 551 void WorldSession::HandleSetTradeGoldOpcode(WorldPacket& recvPacket)
 552 {
 553     CHECK_PACKET_SIZE(recvPacket,4);
 554
 555     if(!_player->pTrader)
 556         return;
 557
 558     uint32 gold;
 559
 560     recvPacket >> gold;
 561
 562     // gold can be incorrect, but this is checked at trade finished.
 563     _player->tradeGold = gold;
 564
 565     _player->pTrader->GetSession()->SendUpdateTrade();
 566 }
 567
 568 void WorldSession::HandleSetTradeItemOpcode(WorldPacket& recvPacket)
 569 {
 570     CHECK_PACKET_SIZE(recvPacket,1+1+1);
 571
 572     if(!_player->pTrader)
 573         return;
 574
 575     // send update
 576     uint8 tradeSlot;
 577     uint8 bag;
 578     uint8 slot;
 579
 580     recvPacket >> tradeSlot;
 581     recvPacket >> bag;
 582     recvPacket >> slot;
 583
 584     // invalid slot number
 585     if(tradeSlot >= TRADE_SLOT_COUNT)
 586     {
 587         SendTradeStatus(TRADE_STATUS_TRADE_CANCELED);
 588         return;
 589     }
 590
 591     // check cheating, can't fail with correct client operations
 592     Item* item = _player->GetItemByPos(bag,slot);
 593     if(!item || tradeSlot!=TRADE_SLOT_NONTRADED && !item->CanBeTraded())
 594     {
 595         SendTradeStatus(TRADE_STATUS_TRADE_CANCELED);
 596         return;
 597     }
 598
 599     uint16 pos = (bag << 8) | slot;
 600
 601     // prevent place single item into many trade slots using cheating and client bugs
 602     for(int i = 0; i < TRADE_SLOT_COUNT; ++i)
 603     {
 604         if(_player->tradeItems[i]==pos)
 605         {
 606             // cheating attempt
 607             SendTradeStatus(TRADE_STATUS_TRADE_CANCELED);
 608             return;
 609         }
 610     }
 611
 612     _player->tradeItems[tradeSlot] = pos;
 613
 614     _player->pTrader->GetSession()->SendUpdateTrade();
 615 }
 616
 617 void WorldSession::HandleClearTradeItemOpcode(WorldPacket& recvPacket)
 618 {
 619     CHECK_PACKET_SIZE(recvPacket,1);
 620
 621     if(!_player->pTrader)
 622         return;
 623
 624     uint8 tradeSlot;
 625     recvPacket >> tradeSlot;
 626
 627     // invalid slot number
 628     if(tradeSlot >= TRADE_SLOT_COUNT)
 629         return;
 630
 631     _player->tradeItems[tradeSlot] = NULL_SLOT;
 632
 633     _player->pTrader->GetSession()->SendUpdateTrade();
 634 }