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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| import Eth from "@ledgerhq/hw-app-eth"; | ||
| import Transport from "@ledgerhq/hw-transport"; | ||
| import TransportWebHID from "@ledgerhq/hw-transport-webhid"; | ||
| import { | ||
| JsonRpcProvider, | ||
| Signature, | ||
| Transaction, | ||
| TransactionLike, | ||
| TypedDataEncoder, | ||
| } from "ethers"; | ||
| import log from "loglevel"; | ||
|
|
||
| import { config } from "../config"; | ||
|
|
||
| class LedgerSigner { | ||
| private static readonly ethereumApp = "Ethereum"; | ||
| private static readonly path = "44'/60'/0'/0/0"; | ||
|
|
||
| private readonly provider: JsonRpcProvider; | ||
| private transport?: Transport; | ||
|
|
||
| constructor() { | ||
| this.provider = new JsonRpcProvider( | ||
| config.assets["RBTC"].network.rpcUrls[0], | ||
| ); | ||
| } | ||
|
|
||
| public request = async (request: { | ||
| method: string; | ||
| params?: Array<unknown>; | ||
| }) => { | ||
| switch (request.method) { | ||
| case "eth_requestAccounts": { | ||
| log.debug("Getting Ledger accounts"); | ||
|
|
||
| if (this.transport === undefined) { | ||
| this.transport = await TransportWebHID.create(); | ||
| } | ||
|
|
||
| const openApp = (await this.getApp()).name; | ||
| log.debug(`Ledger has app open: ${openApp}`); | ||
| if (openApp !== LedgerSigner.ethereumApp) { | ||
| log.info(`Opening Ledger ${LedgerSigner.ethereumApp} app`); | ||
| await this.openApp(LedgerSigner.ethereumApp); | ||
| } | ||
|
|
||
| const eth = new Eth(this.transport); | ||
| const { address } = await eth.getAddress(LedgerSigner.path); | ||
|
|
||
| return [address]; | ||
| } | ||
|
|
||
| case "eth_sendTransaction": { | ||
| log.debug("Signing transaction with Ledger"); | ||
|
|
||
| const txParams = request.params[0] as TransactionLike; | ||
|
|
||
| const [nonce, network, feeData] = await Promise.all([ | ||
| this.provider.getTransactionCount(txParams.from), | ||
| this.provider.getNetwork(), | ||
| this.provider.getFeeData(), | ||
| ]); | ||
|
|
||
| const tx = Transaction.from({ | ||
| ...txParams, | ||
| nonce, | ||
| type: 0, | ||
| from: undefined, | ||
| chainId: network.chainId, | ||
| gasPrice: feeData.gasPrice, | ||
| gasLimit: (txParams as any).gas, | ||
| }); | ||
|
|
||
| const eth = new Eth(this.transport); | ||
| const signature = await eth.clearSignTransaction( | ||
| LedgerSigner.path, | ||
| tx.unsignedSerialized.substring(2), | ||
| {}, | ||
| ); | ||
|
|
||
| tx.signature = this.serializeSignature(signature); | ||
| await this.provider.send("eth_sendRawTransaction", [ | ||
| tx.serialized, | ||
| ]); | ||
|
|
||
| return tx.hash; | ||
| } | ||
|
|
||
| case "eth_signTypedData_v4": { | ||
| log.debug("Signing EIP-712 message with Ledger"); | ||
|
|
||
| const eth = new Eth(this.transport); | ||
| const message = JSON.parse(request.params[1] as string); | ||
|
|
||
| try { | ||
| const signature = await eth.signEIP712Message( | ||
| LedgerSigner.path, | ||
| message, | ||
| ); | ||
| return this.serializeSignature(signature); | ||
| } catch (e) { | ||
| // Compatibility with Ledger Nano S | ||
| log.warn("Clear signing EIP-712 message failed", e); | ||
|
|
||
| const types = message.types; | ||
| delete types["EIP712Domain"]; | ||
|
|
||
| const signature = await eth.signEIP712HashedMessage( | ||
| LedgerSigner.path, | ||
| TypedDataEncoder.hashDomain(message.domain), | ||
| TypedDataEncoder.hashStruct( | ||
| message.primaryType, | ||
| types, | ||
| message.message, | ||
| ), | ||
| ); | ||
| return this.serializeSignature(signature); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return this.provider.send(request.method, request.params); | ||
| }; | ||
|
|
||
| public on = () => {}; | ||
|
|
||
| public removeAllListeners = () => {}; | ||
|
|
||
| private getApp = async (): Promise<{ | ||
| name: string; | ||
| version: string; | ||
| flags: number | Buffer; | ||
| }> => { | ||
| const r = await this.transport!.send(0xb0, 0x01, 0x00, 0x00); | ||
| let i = 0; | ||
| const format = r[i++]; | ||
|
|
||
| if (format !== 1) { | ||
| throw " format not supported"; | ||
| } | ||
|
|
||
| const nameLength = r[i++]; | ||
| const name = r.subarray(i, (i += nameLength)).toString("ascii"); | ||
| const versionLength = r[i++]; | ||
| const version = r.subarray(i, (i += versionLength)).toString("ascii"); | ||
| const flagLength = r[i++]; | ||
| const flags = r.subarray(i, i + flagLength); | ||
| return { | ||
| name, | ||
| version, | ||
| flags, | ||
| }; | ||
| }; | ||
|
|
||
| private openApp = async (name: string): Promise<void> => { | ||
| await this.transport!.send( | ||
| 0xe0, | ||
| 0xd8, | ||
| 0x00, | ||
| 0x00, | ||
| Buffer.from(name, "ascii"), | ||
| ); | ||
| }; | ||
|
|
||
| private serializeSignature = (signature: { | ||
| v: number | string; | ||
| r: string; | ||
| s: string; | ||
| }) => | ||
| Signature.from({ | ||
| v: signature.v, | ||
| r: BigInt(`0x${signature.r}`).toString(), | ||
| s: BigInt(`0x${signature.s}`).toString(), | ||
| }).serialized; | ||
| } | ||
|
|
||
| export default LedgerSigner; |
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