laconic-wallet/utils/SignMessage.ts

/*  Importing this library provides react native with a secure random source.
For more information, "visit https://docs.ethers.org/v5/cookbook/react-native/#cookbook-reactnative-security" */
import 'react-native-get-random-values';
import '@ethersproject/shims';

import { Wallet } from 'ethers';

import { SignMessageParams } from '../types';
import { getCosmosAccounts, getMnemonic, getPathKey } from './utils';

const signMessage = async ({
  message,
  network,
  accountId,
}: SignMessageParams): Promise<string | undefined> => {
  const hdPath = (await getPathKey(network, accountId)).hdPath;

  switch (network) {
    case 'eth':
      return await signEthMessage(message, accountId);
    case 'cosmos':
      return await signCosmosMessage(message, hdPath);
    default:
      throw new Error('Invalid wallet type');
  }
};

const signEthMessage = async (
  message: string,
  accountId: number,
): Promise<string | undefined> => {
  try {
    const privKey = (await getPathKey('eth', accountId)).privKey;
    const wallet = new Wallet(privKey);
    const signature = await wallet.signMessage(message);

    return signature;
  } catch (error) {
    console.error('Error signing Ethereum message:', error);
    return undefined;
  }
};

const signCosmosMessage = async (
  message: string,
  hdPath: string,
): Promise<string | undefined> => {
  try {
    const mnemonic = await getMnemonic();
    const cosmosAccount = await getCosmosAccounts(mnemonic, hdPath);
    const address = cosmosAccount.data.address;
    const cosmosSignature = await cosmosAccount.cosmosWallet.signAmino(
      address,
      {
        chain_id: '',
        account_number: '0',
        sequence: '0',
        fee: {
          gas: '0',
          amount: [],
        },
        msgs: [
          {
            type: 'sign/MsgSignData',
            value: {
              signer: address,
              data: btoa(message),
            },
          },
        ],
        memo: '',
      },
    );

    return cosmosSignature.signature.signature;
  } catch (error) {
    console.error('Error signing Cosmos message:', error);
    return undefined;
  }
};

export { signMessage, signEthMessage, signCosmosMessage };