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smart contract tx with remote signer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| import { Signer, providers, utils } from 'ethers'; | ||
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| export class RemoteSigner extends Signer { | ||
| private readonly address: string; | ||
| readonly provider: providers.Provider; | ||
| private readonly remoteSigningEndpoint: string; | ||
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| constructor(address: string, provider: providers.Provider, remoteSigningEndpoint: string) { | ||
| super(); | ||
| this.address = address; | ||
| this.provider = provider; | ||
| this.remoteSigningEndpoint = remoteSigningEndpoint; | ||
| } | ||
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| async getAddress(): Promise<string> { | ||
| return this.address; | ||
| } | ||
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| async signMessage(message: string | utils.Bytes): Promise<string> { | ||
| if (typeof(message) === "string") { | ||
| return this.signMessageHash(message); | ||
| } else { | ||
| const messageHash = utils.solidityKeccak256(["string"], [message]) | ||
| return this.signMessageHash(messageHash); | ||
| } | ||
| } | ||
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| async signTransaction(transaction: utils.Deferrable<providers.TransactionRequest>): Promise<string> { | ||
| // Implement the logic to send the transaction to your remote signing service | ||
| // and return the signed transaction | ||
| const tx = { | ||
| from: transaction.from, | ||
| to: transaction.to, | ||
| value: transaction.value, | ||
| gas: transaction.gasLimit?.toString(), | ||
| maxPriorityFeePerGas: transaction.maxPriorityFeePerGas?.toString(), | ||
| maxFeePerGas: transaction.maxFeePerGas?.toString(), | ||
| nonce: transaction.nonce, | ||
| data: transaction.data, | ||
| } | ||
| const signedTransaction = await callJsonRpcEndpoint( | ||
| this.remoteSigningEndpoint, | ||
| "eth_signTransaction", | ||
| [tx] | ||
| ); | ||
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| return signedTransaction; | ||
| } | ||
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| connect(provider: providers.Provider): Signer { | ||
| return new RemoteSigner(this.address, provider, this.remoteSigningEndpoint); | ||
| } | ||
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| private async signMessageHash(messageHash: string): Promise<string> { | ||
| // Implement the logic to send the message hash to your remote signing service | ||
| // and return the signature | ||
| const signature = await callJsonRpcEndpoint( | ||
| this.remoteSigningEndpoint, | ||
| "eth_sign", | ||
| [this.address, messageHash] | ||
| ); | ||
|
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| return signature; | ||
| } | ||
| } | ||
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| interface JsonRpcRequest { | ||
| jsonrpc: string; | ||
| method: string; | ||
| params: any[]; | ||
| id: number; | ||
| } | ||
|
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| interface JsonRpcResponse { | ||
| jsonrpc: string; | ||
| result?: any; | ||
| error?: { | ||
| code: number; | ||
| message: string; | ||
| }; | ||
| id: number; | ||
| } | ||
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| async function callJsonRpcEndpoint( | ||
| url: string, | ||
| method: string, | ||
| params: any[] = [] | ||
| ): Promise<any> { | ||
| const request: JsonRpcRequest = { | ||
| jsonrpc: "2.0", | ||
| method, | ||
| params, | ||
| id: 1, // You might want to generate a unique id for each request | ||
| }; | ||
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| const response = await fetch(url, { | ||
| method: "POST", | ||
| headers: { | ||
| "Content-Type": "application/json", | ||
| }, | ||
| body: JSON.stringify(request), | ||
| }); | ||
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| if (!response.ok) { | ||
| throw new Error(`HTTP error! status: ${response.status}`); | ||
| } | ||
|
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| const jsonResponse: JsonRpcResponse = await response.json(); | ||
|
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| if (jsonResponse.error) { | ||
| throw new Error(`JSON-RPC error: ${jsonResponse.error.message}`); | ||
| } | ||
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| return jsonResponse.result; | ||
| } |