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Merge pull request #335 from onflow/gregor/wallet
Add Wallet APIs for local development
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| package api | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
|
|
||
| evmEmulator "github.com/onflow/flow-go/fvm/evm/emulator" | ||
| "github.com/onflow/go-ethereum/accounts" | ||
| "github.com/onflow/go-ethereum/common" | ||
| "github.com/onflow/go-ethereum/common/hexutil" | ||
| "github.com/onflow/go-ethereum/core/types" | ||
| "github.com/onflow/go-ethereum/crypto" | ||
| "github.com/onflow/go-ethereum/rpc" | ||
|
|
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| "github.com/onflow/flow-evm-gateway/config" | ||
| ) | ||
|
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| type WalletAPI struct { | ||
| net *BlockChainAPI | ||
| config *config.Config | ||
| } | ||
|
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| func NewWalletAPI(config *config.Config, net *BlockChainAPI) *WalletAPI { | ||
| return &WalletAPI{ | ||
| net: net, | ||
| config: config, | ||
| } | ||
| } | ||
|
|
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| // Accounts returns the collection of accounts this node manages. | ||
| func (w *WalletAPI) Accounts() ([]common.Address, error) { | ||
| return []common.Address{ | ||
| crypto.PubkeyToAddress(w.config.WalletKey.PublicKey), | ||
| }, nil | ||
| } | ||
|
|
||
| // Sign calculates an ECDSA signature for: | ||
| // keccak256("\x19Ethereum Signed Message:\n" + len(message) + message). | ||
| // | ||
| // Note, the produced signature conforms to the secp256k1 curve R, S and V values, | ||
| // where the V value will be 27 or 28 for legacy reasons. | ||
| // | ||
| // The account associated with addr must be unlocked. | ||
| // | ||
| // https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign | ||
| func (w *WalletAPI) Sign( | ||
| addr common.Address, | ||
| data hexutil.Bytes, | ||
| ) (hexutil.Bytes, error) { | ||
| // Transform the given message to the following format: | ||
| // keccak256("\x19Ethereum Signed Message:\n"${message length}${message}) | ||
| hash := accounts.TextHash(data) | ||
| // Sign the hash using plain ECDSA operations | ||
| signature, err := crypto.Sign(hash, w.config.WalletKey) | ||
| if err == nil { | ||
| // Transform V from 0/1 to 27/28 according to the yellow paper | ||
| signature[64] += 27 | ||
| } | ||
|
|
||
| return signature, err | ||
| } | ||
|
|
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| // SignTransaction will sign the given transaction with the from account. | ||
| // The node needs to have the private key of the account corresponding with | ||
| // the given from address and it needs to be unlocked. | ||
| func (w *WalletAPI) SignTransaction( | ||
| ctx context.Context, | ||
| args TransactionArgs, | ||
| ) (*SignTransactionResult, error) { | ||
| if args.Gas == nil { | ||
| return nil, errors.New("gas not specified") | ||
| } | ||
| if args.GasPrice == nil && (args.MaxPriorityFeePerGas == nil || args.MaxFeePerGas == nil) { | ||
| return nil, errors.New("missing gasPrice or maxFeePerGas/maxPriorityFeePerGas") | ||
| } | ||
|
|
||
| accounts, err := w.Accounts() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| from := accounts[0] | ||
|
|
||
| nonce := uint64(0) | ||
| if args.Nonce != nil { | ||
| nonce = uint64(*args.Nonce) | ||
| } else { | ||
| num := rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber) | ||
| n, err := w.net.GetTransactionCount(ctx, from, &num) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| nonce = uint64(*n) | ||
| } | ||
|
|
||
| var data []byte | ||
| if args.Data != nil { | ||
| data = *args.Data | ||
| } | ||
|
|
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| tx := types.NewTx(&types.LegacyTx{ | ||
| Nonce: nonce, | ||
| To: args.To, | ||
| Value: args.Value.ToInt(), | ||
| Gas: uint64(*args.Gas), | ||
| GasPrice: args.GasPrice.ToInt(), | ||
| Data: data, | ||
| }) | ||
|
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| signed, err := types.SignTx(tx, evmEmulator.GetDefaultSigner(), w.config.WalletKey) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error signing EVM transaction: %w", err) | ||
| } | ||
|
|
||
| raw, err := signed.MarshalBinary() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| return &SignTransactionResult{ | ||
| Raw: raw, | ||
| Tx: tx, | ||
| }, nil | ||
| } | ||
|
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||
| // SendTransaction creates a transaction for the given argument, sign it | ||
| // and submit it to the transaction pool. | ||
| func (w *WalletAPI) SendTransaction( | ||
| ctx context.Context, | ||
| args TransactionArgs, | ||
| ) (common.Hash, error) { | ||
| signed, err := w.SignTransaction(ctx, args) | ||
| if err != nil { | ||
| return common.Hash{}, err | ||
| } | ||
|
|
||
| return w.net.SendRawTransaction(ctx, signed.Raw) | ||
| } |
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