文章目录
  1. 1. 文档更新说明
  2. 2. 前言
  3. 3. 世界杯合约源码  

文档更新说明

  • 最后更新 2018年06月27日
  • 首次更新 2018年06月27日

前言

  本文主要用户记录近期开发的以太坊ERC721合约—世界杯竞拍, 源码已经全部开源到github上. 世界杯合约, 本合约已经应用于https://world-cup.games, 另外说一下这个平台的前端合约操作JS部分也是我写的.

世界杯合约源码  

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
pragma solidity ^0.4.21;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @title SafeMath32
* @dev SafeMath library implemented for uint32
*/
library SafeMath32 {
function mul(uint32 a, uint32 b) internal pure returns (uint32) {
if (a == 0) {
return 0;
}
uint32 c = a * b;
assert(c / a == b);
return c;
}
function div(uint32 a, uint32 b) internal pure returns (uint32) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint32 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint32 a, uint32 b) internal pure returns (uint32) {
assert(b <= a);
return a - b;
}
function add(uint32 a, uint32 b) internal pure returns (uint32) {
uint32 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @title SafeMath16
* @dev SafeMath library implemented for uint16
*/
library SafeMath16 {
function mul(uint16 a, uint16 b) internal pure returns (uint16) {
if (a == 0) {
return 0;
}
uint16 c = a * b;
assert(c / a == b);
return c;
}
function div(uint16 a, uint16 b) internal pure returns (uint16) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint16 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint16 a, uint16 b) internal pure returns (uint16) {
assert(b <= a);
return a - b;
}
function add(uint16 a, uint16 b) internal pure returns (uint16) {
uint16 c = a + b;
assert(c >= a);
return c;
}
}
/**
* Utility library of inline functions on addresses
*/
library AddressUtils {
/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param addr address to check
* @return whether the target address is a contract
*/
function isContract(address addr) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.
// See https://ethereum.stackexchange.com/a/14016/36603
// for more details about how this works.
// TODO Check this again before the Serenity release, because all addresses will be
// contracts then.
assembly { size := extcodesize(addr) } // solium-disable-line security/no-inline-assembly
return size > 0;
}
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
/**
* @title Claimable
* @dev Extension for the Ownable contract, where the ownership needs to be claimed.
* This allows the new owner to accept the transfer.
*/
contract Claimable is Ownable {
address public pendingOwner;
/**
* @dev Modifier throws if called by any account other than the pendingOwner.
*/
modifier onlyPendingOwner() {
require(msg.sender == pendingOwner);
_;
}
/**
* @dev Allows the current owner to set the pendingOwner address.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public {
pendingOwner = newOwner;
}
/**
* @dev Allows the pendingOwner address to finalize the transfer.
*/
function claimOwnership() onlyPendingOwner public {
emit OwnershipTransferred(owner, pendingOwner);
owner = pendingOwner;
pendingOwner = address(0);
}
}
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = false;
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(paused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() onlyOwner whenNotPaused public {
paused = true;
emit Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused public {
paused = false;
emit Unpause();
}
}
/**
* @title ERC721 Non-Fungible Token Standard basic interface
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Basic {
event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);
event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
function balanceOf(address _owner) public view returns (uint256 _balance);
function ownerOf(uint256 _tokenId) public view returns (address _owner);
function exists(uint256 _tokenId) public view returns (bool _exists);
function approve(address _to, uint256 _tokenId) public;
function getApproved(uint256 _tokenId) public view returns (address _operator);
function setApprovalForAll(address _operator, bool _approved) public;
function isApprovedForAll(address _owner, address _operator) public view returns (bool);
function transferFrom(address _from, address _to, uint256 _tokenId) public;
function safeTransferFrom(address _from, address _to, uint256 _tokenId) public;
function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
public;
}
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract ERC721Receiver {
/**
* @dev Magic value to be returned upon successful reception of an NFT
* Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`,
* which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
*/
bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;
/**
* @notice Handle the receipt of an NFT
* @dev The ERC721 smart contract calls this function on the recipient
* after a `safetransfer`. This function MAY throw to revert and reject the
* transfer. This function MUST use 50,000 gas or less. Return of other
* than the magic value MUST result in the transaction being reverted.
* Note: the contract address is always the message sender.
* @param _from The sending address
* @param _tokenId The NFT identifier which is being transfered
* @param _data Additional data with no specified format
* @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
*/
function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4);
}
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721BasicToken is ERC721Basic {
using SafeMath for uint256;
using AddressUtils for address;
// Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
// which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;
// Mapping from token ID to owner
mapping (uint256 => address) internal tokenOwner;
// Mapping from token ID to approved address
mapping (uint256 => address) internal tokenApprovals;
// Mapping from owner to number of owned token
mapping (address => uint256) internal ownedTokensCount;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) internal operatorApprovals;
/**
* @dev Guarantees msg.sender is owner of the given token
* @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
*/
modifier onlyOwnerOf(uint256 _tokenId) {
require(ownerOf(_tokenId) == msg.sender);
_;
}
/**
* @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
* @param _tokenId uint256 ID of the token to validate
*/
modifier canTransfer(uint256 _tokenId) {
require(isApprovedOrOwner(msg.sender, _tokenId));
_;
}
/**
* @dev Gets the balance of the specified address
* @param _owner address to query the balance of
* @return uint256 representing the amount owned by the passed address
*/
function balanceOf(address _owner) public view returns (uint256) {
require(_owner != address(0));
return ownedTokensCount[_owner];
}
/**
* @dev Gets the owner of the specified token ID
* @param _tokenId uint256 ID of the token to query the owner of
* @return owner address currently marked as the owner of the given token ID
*/
function ownerOf(uint256 _tokenId) public view returns (address) {
address owner = tokenOwner[_tokenId];
require(owner != address(0));
return owner;
}
/**
* @dev Returns whether the specified token exists
* @param _tokenId uint256 ID of the token to query the existance of
* @return whether the token exists
*/
function exists(uint256 _tokenId) public view returns (bool) {
address owner = tokenOwner[_tokenId];
return owner != address(0);
}
/**
* @dev Approves another address to transfer the given token ID
* @dev The zero address indicates there is no approved address.
* @dev There can only be one approved address per token at a given time.
* @dev Can only be called by the token owner or an approved operator.
* @param _to address to be approved for the given token ID
* @param _tokenId uint256 ID of the token to be approved
*/
function approve(address _to, uint256 _tokenId) public {
address owner = ownerOf(_tokenId);
require(_to != owner);
require(msg.sender == owner || isApprovedForAll(owner, msg.sender));
if (getApproved(_tokenId) != address(0) || _to != address(0)) {
tokenApprovals[_tokenId] = _to;
emit Approval(owner, _to, _tokenId);
}
}
/**
* @dev Gets the approved address for a token ID, or zero if no address set
* @param _tokenId uint256 ID of the token to query the approval of
* @return address currently approved for a the given token ID
*/
function getApproved(uint256 _tokenId) public view returns (address) {
return tokenApprovals[_tokenId];
}
/**
* @dev Sets or unsets the approval of a given operator
* @dev An operator is allowed to transfer all tokens of the sender on their behalf
* @param _to operator address to set the approval
* @param _approved representing the status of the approval to be set
*/
function setApprovalForAll(address _to, bool _approved) public {
require(_to != msg.sender);
operatorApprovals[msg.sender][_to] = _approved;
emit ApprovalForAll(msg.sender, _to, _approved);
}
/**
* @dev Tells whether an operator is approved by a given owner
* @param _owner owner address which you want to query the approval of
* @param _operator operator address which you want to query the approval of
* @return bool whether the given operator is approved by the given owner
*/
function isApprovedForAll(address _owner, address _operator) public view returns (bool) {
return operatorApprovals[_owner][_operator];
}
/**
* @dev Transfers the ownership of a given token ID to another address
* @dev Usage of this method is discouraged, use `safeTransferFrom` whenever possible
* @dev Requires the msg sender to be the owner, approved, or operator
* @param _from current owner of the token
* @param _to address to receive the ownership of the given token ID
* @param _tokenId uint256 ID of the token to be transferred
*/
function transferFrom(address _from, address _to, uint256 _tokenId) public canTransfer(_tokenId) {
require(_from != address(0));
require(_to != address(0));
clearApproval(_from, _tokenId);
removeTokenFrom(_from, _tokenId);
addTokenTo(_to, _tokenId);
emit Transfer(_from, _to, _tokenId);
}
/**
* @dev Safely transfers the ownership of a given token ID to another address
* @dev If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
* @dev Requires the msg sender to be the owner, approved, or operator
* @param _from current owner of the token
* @param _to address to receive the ownership of the given token ID
* @param _tokenId uint256 ID of the token to be transferred
*/
function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId
)
public
canTransfer(_tokenId)
{
// solium-disable-next-line arg-overflow
safeTransferFrom(_from, _to, _tokenId, "");
}
/**
* @dev Safely transfers the ownership of a given token ID to another address
* @dev If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
* @dev Requires the msg sender to be the owner, approved, or operator
* @param _from current owner of the token
* @param _to address to receive the ownership of the given token ID
* @param _tokenId uint256 ID of the token to be transferred
* @param _data bytes data to send along with a safe transfer check
*/
function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
public
canTransfer(_tokenId)
{
transferFrom(_from, _to, _tokenId);
// solium-disable-next-line arg-overflow
require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
}
/**
* @dev Returns whether the given spender can transfer a given token ID
* @param _spender address of the spender to query
* @param _tokenId uint256 ID of the token to be transferred
* @return bool whether the msg.sender is approved for the given token ID,
* is an operator of the owner, or is the owner of the token
*/
function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) {
address owner = ownerOf(_tokenId);
return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender);
}
/**
* @dev Internal function to mint a new token
* @dev Reverts if the given token ID already exists
* @param _to The address that will own the minted token
* @param _tokenId uint256 ID of the token to be minted by the msg.sender
*/
function _mint(address _to, uint256 _tokenId) internal {
require(_to != address(0));
addTokenTo(_to, _tokenId);
emit Transfer(address(0), _to, _tokenId);
}
/**
* @dev Internal function to burn a specific token
* @dev Reverts if the token does not exist
* @param _tokenId uint256 ID of the token being burned by the msg.sender
*/
function _burn(address _owner, uint256 _tokenId) internal {
clearApproval(_owner, _tokenId);
removeTokenFrom(_owner, _tokenId);
emit Transfer(_owner, address(0), _tokenId);
}
/**
* @dev Internal function to clear current approval of a given token ID
* @dev Reverts if the given address is not indeed the owner of the token
* @param _owner owner of the token
* @param _tokenId uint256 ID of the token to be transferred
*/
function clearApproval(address _owner, uint256 _tokenId) internal {
require(ownerOf(_tokenId) == _owner);
if (tokenApprovals[_tokenId] != address(0)) {
tokenApprovals[_tokenId] = address(0);
emit Approval(_owner, address(0), _tokenId);
}
}
/**
* @dev Internal function to add a token ID to the list of a given address
* @param _to address representing the new owner of the given token ID
* @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function addTokenTo(address _to, uint256 _tokenId) internal {
require(tokenOwner[_tokenId] == address(0));
tokenOwner[_tokenId] = _to;
ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
}
/**
* @dev Internal function to remove a token ID from the list of a given address
* @param _from address representing the previous owner of the given token ID
* @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function removeTokenFrom(address _from, uint256 _tokenId) internal {
require(ownerOf(_tokenId) == _from);
ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
tokenOwner[_tokenId] = address(0);
}
/**
* @dev Internal function to invoke `onERC721Received` on a target address
* @dev The call is not executed if the target address is not a contract
* @param _from address representing the previous owner of the given token ID
* @param _to target address that will receive the tokens
* @param _tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return whether the call correctly returned the expected magic value
*/
function checkAndCallSafeTransfer(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
internal
returns (bool)
{
if (!_to.isContract()) {
return true;
}
bytes4 retval = ERC721Receiver(_to).onERC721Received(_from, _tokenId, _data);
return (retval == ERC721_RECEIVED);
}
}
contract PausableToken is ERC721BasicToken, Pausable {
function approve(address _to, uint256 _tokenId) public whenNotPaused {
super.approve(_to, _tokenId);
}
function setApprovalForAll(address _operator, bool _approved) public whenNotPaused {
super.setApprovalForAll(_operator, _approved);
}
function transferFrom(address _from, address _to, uint256 _tokenId) public whenNotPaused {
super.transferFrom(_from, _to, _tokenId);
}
function safeTransferFrom(address _from, address _to, uint256 _tokenId) public whenNotPaused {
super.safeTransferFrom(_from, _to, _tokenId);
}
function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
public whenNotPaused {
super.safeTransferFrom(_from, _to, _tokenId, _data);
}
}
/**
* @title WorldCupFactory
* @author Cocos
* @dev Declare token struct, and generated all toekn
*/
contract WorldCupFactory is Claimable, PausableToken {
using SafeMath for uint256;
uint public initPrice;
//string[] public initTokenData = [];
// @dev Declare token struct
struct Country {
// token name
string name;
// token current price
uint price;
}
Country[] public countries;
/// @dev A mapping from countryIDs to an address that has been approved to call
/// transferFrom(). Each Country can only have one approved address for transfer
/// at any time. A zero value means no approval is outstanding.
//mapping (uint => address) internal tokenOwner;
// @dev A mapping from owner address to count of tokens that address owns.
// Used internally inside balanceOf() to resolve ownership count.
//mapping (address => uint) internal ownedTokensCount;
/// @dev The WorldCupFactory constructor sets the initialized price of One token
function WorldCupFactory(uint _initPrice) public {
initPrice = _initPrice;
paused = true;
}
function createToken() external onlyOwner {
// Create tokens
uint length = countries.length;
for (uint i = length; i < length + 100; i++) {
if (i >= 836 ) {
break;
}
if (i < 101) {
_createToken("Country");
}else {
_createToken("Player");
}
}
}
/// @dev Create token with _name, internally.
function _createToken(string _name) internal {
uint id = countries.push( Country(_name, initPrice) ) - 1;
tokenOwner[id] = msg.sender;
ownedTokensCount[msg.sender] = ownedTokensCount[msg.sender].add(1);
}
}
/**
* @title Control and manage
* @author Cocos
* @dev Use for owner setting operating income address, PayerInterface.
*
*/
contract WorldCupControl is WorldCupFactory {
/// @dev Operating income address.
address public cooAddress;
function WorldCupControl() public {
cooAddress = msg.sender;
}
/// @dev Assigns a new address to act as the COO.
/// @param _newCOO The address of the new COO.
function setCOO(address _newCOO) external onlyOwner {
require(_newCOO != address(0));
cooAddress = _newCOO;
}
/// @dev Allows the CFO to capture the balance available to the contract.
function withdrawBalance() external onlyOwner {
uint balance = address(this).balance;
cooAddress.send(balance);
}
}
/**
* @title Define
* @author Cocos
* @dev Provide some function for web front-end that can be use for convenience.
*
*/
contract WorldCupHelper is WorldCupControl {
/// @dev Return tokenid array
function getTokenByOwner(address _owner) external view returns(uint[]) {
uint[] memory result = new uint[](ownedTokensCount[_owner]);
uint counter = 0;
for (uint i = 0; i < countries.length; i++) {
if (tokenOwner[i] == _owner) {
result[counter] = i;
counter++;
}
}
return result;
}
/// @dev Return tokens price list. It gets the same order as ids.
function getTokenPriceListByIds(uint[] _ids) external view returns(uint[]) {
uint[] memory result = new uint[](_ids.length);
uint counter = 0;
for (uint i = 0; i < _ids.length; i++) {
Country storage token = countries[_ids[i]];
result[counter] = token.price;
counter++;
}
return result;
}
}
/// @dev PayerInterface must implement ERC20 standard token.
contract PayerInterface {
function totalSupply() public view returns (uint256);
function balanceOf(address who) public view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
function allowance(address owner, address spender) public view returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
}
/**
* @title AuctionPaused
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract AuctionPaused is Ownable {
event AuctionPause();
event AuctionUnpause();
bool public auctionPaused = false;
/**
* @dev Modifier to make a function callable only when the contract is not auctionPaused.
*/
modifier whenNotAuctionPaused() {
require(!auctionPaused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is auctionPaused.
*/
modifier whenAuctionPaused() {
require(auctionPaused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function auctionPause() onlyOwner whenNotAuctionPaused public {
auctionPaused = true;
emit AuctionPause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function auctionUnpause() onlyOwner whenAuctionPaused public {
auctionPaused = false;
emit AuctionUnpause();
}
}
contract WorldCupAuction is WorldCupHelper, AuctionPaused {
using SafeMath for uint256;
event PurchaseToken(address indexed _from, address indexed _to, uint256 _tokenId, uint256 _tokenPrice, uint256 _timestamp, uint256 _purchaseCounter);
/// @dev ERC721 Token upper limit of price, cap.
/// Cap is the upper limit of price. It represented eth's cap if isEthPayable is true
/// or erc20 token's cap if isEthPayable is false.
/// Note!!! Using 'wei' for eth's cap units. Using minimum units for erc20 token cap units.
uint public cap;
uint public finalCap;
/// @dev 1 equal to 0.001
/// erc721 token's price increasing. Each purchase the price increases 5%
uint public increasePermillage = 50;
/// @dev 1 equal to 0.001
/// Exchange fee 2.3%
uint public sysFeePermillage = 23;
/// @dev Contract operating income address.
PayerInterface public payerContract = PayerInterface(address(0));
/// @dev If isEthPayable is true, users can only use eth to buy current erc721 token.
/// If isEthPayable is false, that mean's users can only use PayerInterface's token to buy current erc721 token.
bool public isEthPayable;
uint public purchaseCounter = 0;
/// @dev Constructor
/// @param _initPrice erc721 token initialized price.
/// @param _cap Upper limit of increase price.
/// @param _isEthPayable
/// @param _address PayerInterface address, it must be a ERC20 contract.
function WorldCupAuction(uint _initPrice, uint _cap, bool _isEthPayable, address _address) public WorldCupFactory(_initPrice) {
require( (_isEthPayable == false && _address != address(0)) || _isEthPayable == true && _address == address(0) );
cap = _cap;
finalCap = _cap.add(_cap.mul(25).div(1000));
isEthPayable = _isEthPayable;
payerContract = PayerInterface(_address);
}
function purchaseWithEth(uint _tokenId) external payable whenNotAuctionPaused {
require(isEthPayable == true);
require(msg.sender != tokenOwner[_tokenId]);
/// @dev If `_tokenId` is out of the range of the array,
/// this will throw automatically and revert all changes.
Country storage token = countries[_tokenId];
uint nextPrice = _computeNextPrice(token);
require(msg.value >= nextPrice);
uint fee = nextPrice.mul(sysFeePermillage).div(1000);
uint oldOwnerRefund = nextPrice.sub(fee);
address oldOwner = ownerOf(_tokenId);
// Refund eth to the person who owned this erc721 token.
oldOwner.transfer(oldOwnerRefund);
// Transfer fee to the cooAddress.
cooAddress.transfer(fee);
// Transfer eth left go back to the sender.
if ( msg.value.sub(oldOwnerRefund).sub(fee) > 0.0001 ether ) {
msg.sender.transfer( msg.value.sub(oldOwnerRefund).sub(fee) );
}
//Update token price
token.price = nextPrice;
_transfer(oldOwner, msg.sender, _tokenId);
emit PurchaseToken(oldOwner, msg.sender, _tokenId, nextPrice, now, purchaseCounter);
purchaseCounter = purchaseCounter.add(1);
}
function purchaseWithToken(uint _tokenId) external whenNotAuctionPaused {
require(isEthPayable == false);
require(payerContract != address(0));
require(msg.sender != tokenOwner[_tokenId]);
Country storage token = countries[_tokenId];
uint nextPrice = _computeNextPrice(token);
// We need to know how much erc20 token allows our contract to transfer.
uint256 aValue = payerContract.allowance(msg.sender, address(this));
require(aValue >= nextPrice);
uint fee = nextPrice.mul(sysFeePermillage).div(1000);
uint oldOwnerRefund = nextPrice.sub(fee);
address oldOwner = ownerOf(_tokenId);
// Refund erc20 token to the person who owned this erc721 token.
require(payerContract.transferFrom(msg.sender, oldOwner, oldOwnerRefund));
// Transfer fee to the cooAddress.
require(payerContract.transferFrom(msg.sender, cooAddress, fee));
// Update token price
token.price = nextPrice;
_transfer(oldOwner, msg.sender, _tokenId);
emit PurchaseToken(oldOwner, msg.sender, _tokenId, nextPrice, now, purchaseCounter);
purchaseCounter = purchaseCounter.add(1);
}
function getTokenNextPrice(uint _tokenId) public view returns(uint) {
Country storage token = countries[_tokenId];
uint nextPrice = _computeNextPrice(token);
return nextPrice;
}
function _computeNextPrice(Country storage token) private view returns(uint) {
if (token.price >= cap) {
return finalCap;
}
uint price = token.price;
uint addPrice = price.mul(increasePermillage).div(1000);
uint nextPrice = price.add(addPrice);
if (nextPrice > cap) {
nextPrice = cap;
}
return nextPrice;
}
function _transfer(address _from, address _to, uint256 _tokenId) internal {
// Clear approval.
if (tokenApprovals[_tokenId] != address(0)) {
tokenApprovals[_tokenId] = address(0);
emit Approval(_from, address(0), _tokenId);
}
ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
tokenOwner[_tokenId] = _to;
emit Transfer(_from, _to, _tokenId);
}
}
contract CryptoWCRC is WorldCupAuction {
string public constant name = "CryptoWCRC";
string public constant symbol = "WCRC";
function CryptoWCRC(uint _initPrice, uint _cap, bool _isEthPayable, address _address) public WorldCupAuction(_initPrice, _cap, _isEthPayable, _address) {
}
function totalSupply() public view returns (uint256) {
return countries.length;
}
}
文章目录
  1. 1. 文档更新说明
  2. 2. 前言
  3. 3. 世界杯合约源码