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metamask.signer.ts
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metamask.signer.ts
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import { providers } from 'ethers';
import detectMetamask from '@metamask/detect-provider';
import { ERROR_MESSAGES } from '../../errors';
import { ProviderType, ProviderEvent } from './signer.types';
import { SignerService } from './signer.service';
import { getLogger } from '../../config/logger.config';
export const fromMetaMask = async (): Promise<SignerService> => {
const provider = await createMetamaskProvider();
const signer = new providers.Web3Provider(provider).getSigner();
getLogger().info(
`metamask chain id: ${(await signer.provider.getNetwork()).chainId}}`
);
const signerService = new SignerService(signer, ProviderType.MetaMask);
provider.on(ProviderEvent.AccountChanged, () =>
signerService.emit(ProviderEvent.AccountChanged)
);
provider.on(ProviderEvent.NetworkChanged, () =>
signerService.emit(ProviderEvent.NetworkChanged)
);
await signerService.init();
return signerService;
};
const createMetamaskProvider = async () => {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const metamaskProvider: any = await detectMetamask({
mustBeMetaMask: true,
});
if (!metamaskProvider) {
throw new Error(ERROR_MESSAGES.METAMASK_PROVIDER_NOT_DETECTED);
}
const requestObject = {
method: 'eth_accounts',
params: [
{
eth_accounts: {},
},
],
};
const accounts: string[] = await metamaskProvider.request(requestObject);
if (accounts.length < 1) {
await metamaskProvider.request({
method: 'wallet_requestPermissions',
params: [
{
eth_accounts: {},
},
],
});
}
return metamaskProvider;
};
export const isMetamaskExtensionPresent = async () => {
const provider = (await detectMetamask({ mustBeMetaMask: true })) as
| {
request: unknown;
}
| undefined;
const chainId =
provider && 'request' in provider && provider.request instanceof Function
? ((await provider?.request({
method: 'eth_chainId',
})) as number | undefined)
: undefined;
return { isMetamaskPresent: !!provider, chainId };
};