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import { assert } from '@0xproject/assert';
import { JSONRPCRequestPayload, JSONRPCResponsePayload } from '@0xproject/types';
import { addressUtils } from '@0xproject/utils';
import * as _ from 'lodash';
import { Callback, ErrorCallback, PartialTxParams, ResponseWithTxParams, WalletSubproviderErrors } from '../types';
import { Subprovider } from './subprovider';
export abstract class BaseWalletSubprovider extends Subprovider {
protected static _validateTxParams(txParams: PartialTxParams) {
assert.isETHAddressHex('to', txParams.to);
assert.isHexString('nonce', txParams.nonce);
assert.isHexString('gas', txParams.gas);
}
private static _validateSender(sender: string) {
if (_.isUndefined(sender) || !addressUtils.isAddress(sender)) {
throw new Error(WalletSubproviderErrors.SenderInvalidOrNotSupplied);
}
}
public abstract async getAccountsAsync(): Promise<string[]>;
public abstract async signTransactionAsync(txParams: PartialTxParams): Promise<string>;
public abstract async signPersonalMessageAsync(data: string, address: string): Promise<string>;
/**
* 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:async-suffix
public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
let accounts;
let txParams;
switch (payload.method) {
case 'eth_coinbase':
try {
accounts = await this.getAccountsAsync();
end(null, accounts[0]);
} catch (err) {
end(err);
}
return;
case 'eth_accounts':
try {
accounts = await this.getAccountsAsync();
end(null, accounts);
} catch (err) {
end(err);
}
return;
case 'eth_sendTransaction':
txParams = payload.params[0];
try {
BaseWalletSubprovider._validateSender(txParams.from);
const filledParams = await this._populateMissingTxParamsAsync(txParams);
const signedTx = await this.signTransactionAsync(filledParams);
const response = await this._emitSendTransactionAsync(signedTx);
end(null, response.result);
} catch (err) {
end(err);
}
return;
case 'eth_signTransaction':
txParams = payload.params[0];
try {
const filledParams = await this._populateMissingTxParamsAsync(txParams);
const signedTx = await this.signTransactionAsync(filledParams);
const result = {
raw: signedTx,
tx: txParams,
};
end(null, result);
} catch (err) {
end(err);
}
return;
case 'eth_sign':
case 'personal_sign':
const data = payload.method === 'eth_sign' ? payload.params[1] : payload.params[0];
const address = payload.method === 'eth_sign' ? payload.params[0] : payload.params[1];
try {
const ecSignatureHex = await this.signPersonalMessageAsync(data, address);
end(null, ecSignatureHex);
} catch (err) {
end(err);
}
return;
default:
next();
return;
}
}
private async _emitSendTransactionAsync(signedTx: string): Promise<JSONRPCResponsePayload> {
const payload = {
method: 'eth_sendRawTransaction',
params: [signedTx],
};
const result = await this.emitPayloadAsync(payload);
return result;
}
private async _populateMissingTxParamsAsync(partialTxParams: PartialTxParams): Promise<PartialTxParams> {
let txParams = partialTxParams;
if (_.isUndefined(partialTxParams.gasPrice)) {
const gasPriceResult = await this.emitPayloadAsync({
method: 'eth_gasPrice',
params: [],
});
const gasPrice = gasPriceResult.result.toString();
txParams = { ...txParams, gasPrice };
}
if (_.isUndefined(partialTxParams.nonce)) {
const nonceResult = await this.emitPayloadAsync({
method: 'eth_getTransactionCount',
params: [partialTxParams.from, 'pending'],
});
const nonce = nonceResult.result;
txParams = { ...txParams, nonce };
}
if (_.isUndefined(partialTxParams.gas)) {
const gasResult = await this.emitPayloadAsync({
method: 'eth_estimateGas',
params: [partialTxParams],
});
const gas = gasResult.result.toString();
txParams = { ...txParams, gas };
}
return txParams;
}
}
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