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| 1 | +import { Buffer } from "node:buffer"; |
| 2 | +import type { KMSClientConfig } from "@aws-sdk/client-kms"; |
| 3 | +import { KmsSigner } from "aws-kms-signer"; |
| 4 | +import type { Hex, ThirdwebClient, toSerializableTransaction } from "thirdweb"; |
| 5 | +import { |
| 6 | + type Address, |
| 7 | + eth_sendRawTransaction, |
| 8 | + getRpcClient, |
| 9 | + keccak256, |
| 10 | +} from "thirdweb"; |
| 11 | +import { serializeTransaction } from "thirdweb/transaction"; |
| 12 | +import { hashMessage } from "thirdweb/utils"; |
| 13 | +import type { Account } from "thirdweb/wallets"; |
| 14 | +import type { SignableMessage, TypedData, TypedDataDefinition } from "viem"; |
| 15 | +import { hashTypedData } from "viem"; |
| 16 | +import { getChain } from "./utils/chain"; |
| 17 | + |
| 18 | +type SendTransactionResult = { |
| 19 | + transactionHash: Hex; |
| 20 | +}; |
| 21 | + |
| 22 | +type SerializableTransaction = Awaited< |
| 23 | + ReturnType<typeof toSerializableTransaction> |
| 24 | +>; |
| 25 | + |
| 26 | +type SendTransactionOption = SerializableTransaction & { |
| 27 | + chainId: number; |
| 28 | +}; |
| 29 | + |
| 30 | +type AwsKmsAccountOptions = { |
| 31 | + keyId: string; |
| 32 | + config?: KMSClientConfig; |
| 33 | + client: ThirdwebClient; |
| 34 | +}; |
| 35 | + |
| 36 | +type AwsKmsAccount = Account; |
| 37 | + |
| 38 | +export async function getAwsKmsAccount( |
| 39 | + options: AwsKmsAccountOptions, |
| 40 | +): Promise<AwsKmsAccount> { |
| 41 | + const { keyId, config, client } = options; |
| 42 | + const signer = new KmsSigner(keyId, config); |
| 43 | + |
| 44 | + // Populate address immediately |
| 45 | + const addressUnprefixed = await signer.getAddress(); |
| 46 | + const address = `0x${addressUnprefixed}` as Address; |
| 47 | + |
| 48 | + async function signTransaction(tx: SerializableTransaction): Promise<Hex> { |
| 49 | + const serializedTx = serializeTransaction({ transaction: tx }); |
| 50 | + const txHash = keccak256(serializedTx); |
| 51 | + const signature = await signer.sign(Buffer.from(txHash.slice(2), "hex")); |
| 52 | + |
| 53 | + const r = `0x${signature.r.toString("hex")}` as Hex; |
| 54 | + const s = `0x${signature.s.toString("hex")}` as Hex; |
| 55 | + const v = BigInt(signature.v); |
| 56 | + |
| 57 | + const yParity: 0 | 1 = signature.v % 2 === 0 ? 1 : 0; |
| 58 | + |
| 59 | + const signedTx = serializeTransaction({ |
| 60 | + transaction: tx, |
| 61 | + signature: { |
| 62 | + r, |
| 63 | + s, |
| 64 | + v, |
| 65 | + yParity, |
| 66 | + }, |
| 67 | + }); |
| 68 | + |
| 69 | + return signedTx; |
| 70 | + } |
| 71 | + |
| 72 | + /** |
| 73 | + * Sign a message with the account's private key. |
| 74 | + * If the message is a string, it will be prefixed with the Ethereum message prefix. |
| 75 | + * If the message is an object with a `raw` property, it will be signed as-is. |
| 76 | + */ |
| 77 | + async function signMessage({ |
| 78 | + message, |
| 79 | + }: { |
| 80 | + message: SignableMessage; |
| 81 | + }): Promise<Hex> { |
| 82 | + const messageHash = hashMessage(message); |
| 83 | + const signature = await signer.sign( |
| 84 | + Buffer.from(messageHash.slice(2), "hex"), |
| 85 | + ); |
| 86 | + return `0x${signature.toString()}`; |
| 87 | + } |
| 88 | + |
| 89 | + async function signTypedData< |
| 90 | + const typedData extends TypedData | Record<string, unknown>, |
| 91 | + primaryType extends keyof typedData | "EIP712Domain" = keyof typedData, |
| 92 | + >(_typedData: TypedDataDefinition<typedData, primaryType>): Promise<Hex> { |
| 93 | + const typedDataHash = hashTypedData(_typedData); |
| 94 | + const signature = await signer.sign( |
| 95 | + Buffer.from(typedDataHash.slice(2), "hex"), |
| 96 | + ); |
| 97 | + return `0x${signature.toString()}`; |
| 98 | + } |
| 99 | + |
| 100 | + async function sendTransaction( |
| 101 | + tx: SendTransactionOption, |
| 102 | + ): Promise<SendTransactionResult> { |
| 103 | + const rpcRequest = getRpcClient({ |
| 104 | + client: client, |
| 105 | + chain: await getChain(tx.chainId), |
| 106 | + }); |
| 107 | + |
| 108 | + const signedTx = await signTransaction(tx); |
| 109 | + |
| 110 | + const transactionHash = await eth_sendRawTransaction(rpcRequest, signedTx); |
| 111 | + return { transactionHash }; |
| 112 | + } |
| 113 | + |
| 114 | + return { |
| 115 | + address, |
| 116 | + sendTransaction, |
| 117 | + signMessage, |
| 118 | + signTypedData, |
| 119 | + signTransaction, |
| 120 | + } as AwsKmsAccount satisfies Account; |
| 121 | +} |
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