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import { JSONRPCRequestPayload } from '@0xproject/types';
import * as _ from 'lodash';
import * as Web3 from 'web3';
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 user accounts (getAccounts,
* sendTransaction, etc...) to the provider instance supplied at instantiation. All other requests
* are passed onwards for subsequent subproviders to handle.
*/
export class InjectedWeb3Subprovider extends Subprovider {
private _injectedWeb3: Web3;
/**
* Instantiates a new InjectedWeb3Subprovider
* @param provider Web3 provider that should handle all user account related requests
*/
constructor(provider: Web3.Provider) {
super();
this._injectedWeb3 = new Web3(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
public handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback) {
switch (payload.method) {
case 'web3_clientVersion':
this._injectedWeb3.version.getNode(end);
return;
case 'eth_accounts':
this._injectedWeb3.eth.getAccounts(end);
return;
case 'eth_sendTransaction':
const [txParams] = payload.params;
this._injectedWeb3.eth.sendTransaction(txParams, end);
return;
case 'eth_sign':
const [address, message] = payload.params;
this._injectedWeb3.eth.sign(address, message, end);
return;
default:
next();
return;
}
}
}
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