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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| 'use strict'; | ||
|
|
||
| const { ethers } = require('hardhat'); | ||
| const { | ||
| BigNumber, | ||
| Signer, | ||
| VoidSigner, | ||
| utils: { serializeTransaction }, | ||
| } = ethers; | ||
| const TransportNodeHid = require('@ledgerhq/hw-transport-node-hid').default; | ||
| const Eth = require('@ledgerhq/hw-app-eth').default; | ||
|
|
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| const { printInfo } = require('./utils'); | ||
|
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| class LedgerSigner extends Signer { | ||
| constructor(provider, path = "m/44'/60'/0'/0/0") { | ||
| super(); | ||
| this.path = path; | ||
| this.provider = provider; | ||
| } | ||
|
|
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| async connect(provider = null) { | ||
| if (provider) { | ||
| this.provider = provider; | ||
| } | ||
|
|
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| this.transport = await TransportNodeHid.open(); | ||
| this.eth = new Eth(this.transport); | ||
| } | ||
|
|
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| async getAddress() { | ||
| if (!this.eth) await this.connect(); | ||
| const result = await this.eth.getAddress(this.path); | ||
| return result.address; | ||
| } | ||
|
|
||
| async signMessage(message) { | ||
| if (!this.eth) await this.connect(); | ||
|
|
||
| if (typeof message === 'string') { | ||
| message = ethers.utils.toUtf8Bytes(message); | ||
| } | ||
|
|
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| const messageHex = ethers.utils.hexlify(message).substring(2); | ||
|
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| const sig = await this.eth.signPersonalMessage(this.path, messageHex); | ||
|
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| return ethers.utils.joinSignature(await this._fixSignature(sig, 2, 1)); | ||
| } | ||
|
|
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| async signTransaction(tx) { | ||
| if (!this.eth) await this.connect(); | ||
|
|
||
| delete tx.from; | ||
|
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| tx = await ethers.utils.resolveProperties(tx); | ||
|
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| console.log('Unsigned tx', tx); | ||
|
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| const rawTx = serializeTransaction(tx).substring(2); | ||
|
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| const sig = await this._fixSignature(await this.eth.signTransaction(this.path, rawTx, null), tx.type, tx.chainId); | ||
|
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| const signedTx = serializeTransaction(tx, sig); | ||
|
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| printInfo('Signed Tx', signedTx); | ||
|
|
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| return signedTx; | ||
| } | ||
|
|
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| async populateTransaction(tx) { | ||
| if (!this.eth) await this.connect(); | ||
|
|
||
| return new VoidSigner(await this.getAddress(), this.provider).populateTransaction(tx); | ||
| } | ||
|
|
||
| async _fixSignature(signature, type, chainId) { | ||
| let v = BigNumber.from('0x' + signature.v).toNumber(); | ||
|
|
||
| if (type === 2) { | ||
| // EIP-1559 transaction. Nothing to do. | ||
| // v is already returned as 0 or 1 by Ledger for Type 2 txs | ||
| } else { | ||
| // Undefined or Legacy Type 0 transaction. Ledger computes EIP-155 sig.v computation incorrectly in this case | ||
| // v in {0,1} + 2 * chainId + 35 | ||
| // Ledger gives this value mod 256 | ||
| // So from that, compute whether v is 0 or 1 and then add to 2 * chainId + 35 without doing a mod | ||
| v = 2 * chainId + 35 + ((v + 256 * 100000000000 - (2 * chainId + 35)) % 256); | ||
| } | ||
|
|
||
| return { | ||
| r: '0x' + signature.r, | ||
| s: '0x' + signature.s, | ||
| v, | ||
| }; | ||
| } | ||
|
|
||
| disconnect() { | ||
| if (this.transport) { | ||
| this.transport.close(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| module.exports = { | ||
| LedgerSigner, | ||
| }; |
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