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import { marshaller, Web3Wrapper } from '@0x/web3-wrapper';
import { JSONRPCRequestPayload, Provider } from 'ethereum-types';
import { Callback, ErrorCallback } from '../types';
import { Subprovider } from './subprovider';
/**
* This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine)
* subprovider interface. It forwards JSON RPC requests involving the domain of a signer (getAccounts,
* sendTransaction, signMessage etc...) to the provider instance supplied at instantiation. All other requests
* are passed onwards for subsequent subproviders to handle.
*/
export class SignerSubprovider extends Subprovider {
private readonly _web3Wrapper: Web3Wrapper;
/**
* Instantiates a new SignerSubprovider.
* @param provider Web3 provider that should handle all user account related requests
*/
constructor(provider: Provider) {
super();
this._web3Wrapper = new Web3Wrapper(provider);
}
/**
* This method conforms to the web3-provider-engine interface.
* It is called internally by the ProviderEngine when it is this subproviders
* turn to handle a JSON RPC request.
* @param payload JSON RPC payload
* @param next Callback to call if this subprovider decides not to handle the request
* @param end Callback to call if subprovider handled the request and wants to pass back the request.
*/
// tslint:disable-next-line:prefer-function-over-method async-suffix
public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
let message;
let address;
switch (payload.method) {
case 'web3_clientVersion':
try {
const nodeVersion = await this._web3Wrapper.getNodeVersionAsync();
end(null, nodeVersion);
} catch (err) {
end(err);
}
return;
case 'eth_accounts':
try {
const accounts = await this._web3Wrapper.getAvailableAddressesAsync();
end(null, accounts);
} catch (err) {
end(err);
}
return;
case 'eth_sendTransaction':
const [txParams] = payload.params;
try {
const txData = marshaller.unmarshalTxData(txParams);
const txHash = await this._web3Wrapper.sendTransactionAsync(txData);
end(null, txHash);
} catch (err) {
end(err);
}
return;
case 'eth_sign':
[address, message] = payload.params;
try {
const signature = await this._web3Wrapper.signMessageAsync(address, message);
end(null, signature);
} catch (err) {
end(err);
}
return;
case 'eth_signTypedData':
[address, message] = payload.params;
try {
const signature = await this._web3Wrapper.signTypedDataAsync(address, message);
end(null, signature);
} catch (err) {
end(err);
}
return;
default:
next();
return;
}
}
}
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