115 lines
3.9 KiB
Nim
115 lines
3.9 KiB
Nim
import eth/keys
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import eth/rlp
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import eth/common
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import eth/common/transaction as ct
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import stew/byteutils
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import ./provider
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import ./transaction
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import ./signer
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export keys
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var rng {.threadvar.}: ref HmacDrbgContext
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proc getRng: ref HmacDrbgContext =
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if rng.isnil:
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rng = newRng()
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return rng
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type SignableTransaction = common.Transaction
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type WalletError* = object of EthersError
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type Wallet* = ref object of Signer
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privateKey*: PrivateKey
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publicKey*: PublicKey
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address*: Address
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provider*: ?Provider
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proc new*(_: type Wallet, pk: string, provider: Provider): Wallet =
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result = Wallet()
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result.privateKey = PrivateKey.fromHex(pk).value
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result.publicKey = result.privateKey.toPublicKey()
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result.address = Address.init(result.publicKey.toCanonicalAddress())
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result.provider = some provider
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proc new*(_: type Wallet, pk: string): Wallet =
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result = Wallet()
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result.privateKey = PrivateKey.fromHex(pk).value
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result.publicKey = result.privateKey.toPublicKey()
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result.address = Address.init(result.publicKey.toCanonicalAddress())
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proc connect*(wallet: Wallet, provider: Provider) =
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wallet.provider = some provider
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proc createRandom*(_: type Wallet): Wallet =
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result = Wallet()
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result.privateKey = PrivateKey.random(getRng()[])
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result.publicKey = result.privateKey.toPublicKey()
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result.address = Address.init(result.publicKey.toCanonicalAddress())
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proc createRandom*(_: type Wallet, provider: Provider): Wallet =
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result = Wallet()
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result.privateKey = PrivateKey.random(getRng()[])
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result.publicKey = result.privateKey.toPublicKey()
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result.address = Address.init(result.publicKey.toCanonicalAddress())
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result.provider = some provider
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method provider*(wallet: Wallet): Provider =
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if wallet.provider.isSome:
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return wallet.provider.get
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else:
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raise newException(WalletError, "Wallet has no provider")
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method getAddress(wallet: Wallet): Future[Address] {.async.} =
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return wallet.address
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func isPopulated(tx: transaction.Transaction) =
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if tx.nonce.isNone or
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tx.chainId.isNone or
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tx.gasLimit.isNone or
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(tx.gasPrice.isNone and (tx.maxFee.isNone or tx.maxPriorityFee.isNone)):
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raise newException(WalletError, "Transaction is not properly populated")
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proc signTransaction(tr: var SignableTransaction, pk: PrivateKey) =
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let h = tr.txHashNoSignature
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let s = sign(pk, SkMessage(h.data))
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let r = toRaw(s)
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let v = r[64]
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tr.R = fromBytesBe(UInt256, r.toOpenArray(0, 31))
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tr.S = fromBytesBE(UInt256, r.toOpenArray(32, 63))
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case tr.txType:
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of TxLegacy:
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#tr.V = int64(v) + int64(tr.chainId)*2 + 35 #TODO does not work, not sure why. Sending the tx results in error of too little funds. Maybe something wrong with signature and a wrong sender gets encoded?
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tr.V = int64(v) + 27
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of TxEip1559:
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tr.V = int64(v)
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else:
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raise newException(WalletError, "Transaction type not supported")
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proc signTransaction*(wallet: Wallet, tx: transaction.Transaction): Future[seq[byte]] {.async.} =
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if tx.sender.isSome:
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doAssert tx.sender.get == wallet.address, "from Address mismatch"
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isPopulated(tx)
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var s: SignableTransaction
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if tx.maxFee.isSome and tx.maxPriorityFee.isSome:
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s.txType = TxEip1559
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s.maxFee = GasInt(tx.maxFee.get.truncate(uint64))
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s.maxPriorityFee = GasInt(tx.maxPriorityFee.get.truncate(uint64))
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else:
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s.txType = TxLegacy
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s.gasPrice = GasInt(tx.gasPrice.get.truncate(uint64))
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s.chainId = ChainId(tx.chainId.get.truncate(uint64))
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s.gasLimit = GasInt(tx.gasLimit.get.truncate(uint64))
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s.nonce = tx.nonce.get.truncate(uint64)
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s.to = some EthAddress(tx.to)
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s.payload = tx.data
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signTransaction(s, wallet.privateKey)
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return rlp.encode(s)
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method sendTransaction*(wallet: Wallet, tx: transaction.Transaction): Future[TransactionResponse] {.async.} =
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let rawTX = await signTransaction(wallet, tx)
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return await wallet.provider.get.sendTransaction(rawTX)
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#TODO add functionality to sign messages
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#TODO add functionality to create wallets from Mnemoniks or Keystores |