blockchainethereumblockchain-walleterc20erc721walletxdaidappdecentralizederc1155erc875iosswifttokens
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156 lines
5.0 KiB
156 lines
5.0 KiB
// Copyright © 2018 Stormbird PTE. LTD.
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import BigInt
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import WalletCore
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public struct Order {
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var price: BigUInt
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var indices: [UInt16]
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var expiry: BigUInt
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var contractAddress: AlphaWallet.Address
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var count: BigUInt
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var nonce: BigUInt
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var tokenIds: [BigUInt]?
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var spawnable: Bool
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var nativeCurrencyDrop: Bool
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}
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public struct SignedOrder {
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var order: Order
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var message: [UInt8]
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var signature: String
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}
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extension String {
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var hexToBytes: [UInt8] {
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let hex: [Character]
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if count % 2 == 0 {
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hex = Array(self)
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} else {
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hex = Array(("0" + self))
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}
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return stride(from: 0, to: count, by: 2).compactMap {
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UInt8(String(hex[$0..<$0.advanced(by: 2)]), radix: 16)
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}
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}
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}
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extension BinaryInteger {
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var data: Data {
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var source = self
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return Data(bytes: &source, count: MemoryLayout<Self>.size)
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}
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}
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extension Data {
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var array: [UInt8] {
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return Array(self)
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}
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}
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public class OrderHandler {
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private let keystore: Keystore
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init(keystore: Keystore) {
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self.keystore = keystore
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}
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func signOrders(orders: [Order], account: AlphaWallet.Address, tokenType: TokenType) throws -> [SignedOrder] {
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let messages = createMessagesFromOrders(orders: orders, tokenType: tokenType)
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return try bulkSignOrders(messages: messages, account: account, orders: orders)
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}
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private func createMessagesFromOrders(orders: [Order], tokenType: TokenType) -> [Data] {
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var messages = [Data]()
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switch tokenType {
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case .erc721ForTickets:
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for order in orders {
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let message: [UInt8] = encodeMessageForTrade(
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price: order.price,
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expiryBuffer: order.expiry,
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tokenIds: order.tokenIds ?? [BigUInt](),
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contractAddress: order.contractAddress
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)
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messages.append(Data(bytes: message))
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}
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case .erc875:
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for order in orders {
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let message: [UInt8] = encodeMessageForTrade(
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price: order.price,
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expiryBuffer: order.expiry,
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indices: order.indices,
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contractAddress: order.contractAddress
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)
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messages.append(Data(bytes: message))
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}
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case .erc721, .erc1155, .nativeCryptocurrency, .erc20:
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break
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}
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return messages
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}
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private func bulkSignOrders(messages: [Data], account: AlphaWallet.Address, orders: [Order]) throws -> [SignedOrder] {
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var signedOrders = [SignedOrder]()
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let signatures = try keystore.signMessageBulk(messages, for: account).dematerialize()
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for i in 0..<signatures.count {
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let signedOrder = SignedOrder(
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order: orders[i],
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message: messages[i].bytes,
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signature: signatures[i].hexString
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)
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signedOrders.append(signedOrder)
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}
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return signedOrders
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}
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func encodeMessageForTrade(
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price: BigUInt,
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expiryBuffer: BigUInt,
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indices: [UInt16],
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contractAddress: AlphaWallet.Address
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) -> [UInt8] {
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let arrayLength: Int = 84 + indices.count * 2
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var buffer = [UInt8]()
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buffer.reserveCapacity(arrayLength)
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let priceInWei = UniversalLinkHandler.padTo32(Array(price.serialize()))
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let expiry = UniversalLinkHandler.padTo32(Array(expiryBuffer.serialize()))
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buffer.append(contentsOf: priceInWei)
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buffer.append(contentsOf: expiry)
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//no leading zeros issue here
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buffer.append(contentsOf: contractAddress.eip55String.hexToBytes)
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let tokensUint8 = OrderHandler.uInt16ArrayToUInt8(arrayOfUInt16: indices)
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buffer.append(contentsOf: tokensUint8)
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return buffer
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}
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func encodeMessageForTrade(
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price: BigUInt,
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expiryBuffer: BigUInt,
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tokenIds: [BigUInt],
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contractAddress: AlphaWallet.Address
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) -> [UInt8] {
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let arrayLength: Int = 84 + tokenIds.count * 32
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var buffer = [UInt8]()
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buffer.reserveCapacity(arrayLength)
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let priceInWei = Array(price.serialize())
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let expiry = Array(expiryBuffer.serialize())
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buffer.append(contentsOf: UniversalLinkHandler.padTo32(priceInWei))
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buffer.append(contentsOf: UniversalLinkHandler.padTo32(expiry))
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buffer.append(contentsOf: contractAddress.eip55String.hexToBytes)
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for token in tokenIds {
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buffer.append(contentsOf: UniversalLinkHandler.padTo32(token.serialize().array))
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}
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return buffer
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}
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public static func uInt16ArrayToUInt8(arrayOfUInt16: [UInt16]) -> [UInt8] {
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var arrayOfUint8 = [UInt8]()
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for i in 0..<arrayOfUInt16.count {
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let UInt8ArrayPair = arrayOfUInt16[i].bigEndian.data.array
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arrayOfUint8.append(UInt8ArrayPair[0])
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arrayOfUint8.append(UInt8ArrayPair[1])
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}
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return arrayOfUint8
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}
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}
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