NFT 交易市场后端

1type Order struct {
2    Maker       common.Address `json:"maker"`
3    Taker       common.Address `json:"taker"`
4    Collection  common.Address `json:"collection"`
5    TokenID     *big.Int       `json:"token_id"`
6    Price       *big.Int       `json:"price"`
7    Currency    common.Address `json:"currency"`
8    OrderType   uint8          `json:"order_type"`
9    StartTime   uint64         `json:"start_time"`
10    EndTime     uint64         `json:"end_time"`
11    Salt        *big.Int       `json:"salt"`
12    Signature   []byte         `json:"signature"`
13}
14 
15func (o *Order) Hash() common.Hash {
16    typeHash := crypto.Keccak256Hash([]byte(
17        "Order(address maker,address taker,address collection,uint256 tokenId,uint256 price,address currency,uint8 orderType,uint64 startTime,uint64 endTime,uint256 salt)",
18    ))
19    // ... EIP-712 hash construction
20}
21 
22func (o *Order) VerifySignature() bool {
23    hash := o.Hash()
24    pubKey, err := crypto.SigToPub(hash.Bytes(), o.Signature)
25    if err != nil {
26        return false
27    }
28    return crypto.PubkeyToAddress(*pubKey) == o.Maker
29}

1func (e *MatchingEngine) MatchOrder(ctx context.Context, buyOrder, sellOrder *Order) (*MatchResult, error) {
2    // 验证订单
3    if err := e.validateOrders(buyOrder, sellOrder); err != nil {
4        return nil, err
5    }
6 
7    // 计算费用
8    platformFee := new(big.Int).Div(
9        new(big.Int).Mul(sellOrder.Price, big.NewInt(int64(e.platformFeeBps))),
10        big.NewInt(10000),
11    )
12    
13    royalty, _ := e.getRoyalty(ctx, sellOrder.Collection, sellOrder.TokenID, sellOrder.Price)
14    
15    sellerProceeds := new(big.Int).Sub(sellOrder.Price, platformFee)
16    sellerProceeds.Sub(sellerProceeds, royalty)
17 
18    return &MatchResult{
19        BuyOrder:       buyOrder,
20        SellOrder:      sellOrder,
21        Price:          sellOrder.Price,
22        PlatformFee:    platformFee,
23        Royalty:        royalty,
24        SellerProceeds: sellerProceeds,
25    }, nil
26}