public void SwapToken(Address buyer, Address seller, string baseSymbol, string quoteSymbol, BigInteger tokenID, BigInteger price, byte[] signature)
{
Runtime.Expect(Runtime.IsWitness(buyer), "invalid witness");
Runtime.Expect(seller != buyer, "invalid seller");
Runtime.Expect(seller.IsUser, "seller must be user address");
Runtime.Expect(Runtime.TokenExists(baseSymbol), "invalid base token");
var baseToken = Runtime.GetToken(baseSymbol);
Runtime.Expect(!baseToken.Flags.HasFlag(TokenFlags.Fungible), "token must be non-fungible");
var nft = Runtime.ReadToken(baseSymbol, tokenID);
Runtime.Expect(nft.CurrentChain == Runtime.Chain.Name, "invalid owner");
var owner = nft.CurrentOwner;
Runtime.Expect(owner == seller, "invalid owner");
var swap = new TokenSwap()
{
baseSymbol = baseSymbol,
quoteSymbol = quoteSymbol,
buyer = buyer,
seller = seller,
price = price,
value = tokenID,
};
var msg = Serialization.Serialize(swap);
Runtime.Expect(Ed25519.Verify(signature, msg, seller.ToByteArray().Skip(1).ToArray()), "invalid signature");
Runtime.Expect(Runtime.TokenExists(quoteSymbol), "invalid quote token");
var quoteToken = Runtime.GetToken(quoteSymbol);
Runtime.Expect(quoteToken.Flags.HasFlag(TokenFlags.Fungible), "token must be fungible");
var balance = Runtime.GetBalance(quoteSymbol, buyer);
Runtime.Expect(balance >= price, "invalid balance");
Runtime.TransferTokens(quoteSymbol, buyer, owner, price);
Runtime.TransferToken(baseSymbol, owner, buyer, tokenID);
}
public void SwapTokens(Address buyer, Address seller, string baseSymbol, string quoteSymbol, BigInteger amount, BigInteger price, byte[] signature)
{
Runtime.Expect(Runtime.IsWitness(buyer), "invalid witness");
Runtime.Expect(seller != buyer, "invalid seller");
Runtime.Expect(seller.IsUser, "seller must be user address");
Runtime.Expect(Runtime.TokenExists(baseSymbol), "invalid base token");
var baseToken = Runtime.GetToken(baseSymbol);
Runtime.Expect(baseToken.Flags.HasFlag(TokenFlags.Fungible), "token must be fungible");
var baseBalance = Runtime.GetBalance(baseSymbol, seller);
Runtime.Expect(baseBalance >= amount, "invalid amount");
var swap = new TokenSwap()
{
baseSymbol = baseSymbol,
quoteSymbol = quoteSymbol,
buyer = buyer,
seller = seller,
price = price,
value = amount,
};
var msg = Serialization.Serialize(swap);
Runtime.Expect(Ed25519.Verify(signature, msg, seller.ToByteArray().Skip(2).ToArray()), "invalid signature");
Runtime.Expect(Runtime.TokenExists(quoteSymbol), "invalid quote token");
var quoteToken = Runtime.GetToken(quoteSymbol);
Runtime.Expect(quoteToken.Flags.HasFlag(TokenFlags.Fungible), "token must be fungible");
var quoteBalance = Runtime.GetBalance(quoteSymbol, buyer);
Runtime.Expect(quoteBalance >= price, "invalid balance");
Runtime.TransferTokens(quoteSymbol, buyer, seller, price);
Runtime.TransferTokens(baseSymbol, seller, buyer, amount);
}