aboutsummaryrefslogtreecommitdiffstats
path: root/packages/subproviders/src/subproviders/empty_wallet_subprovider.ts
blob: 4268c67bd4dbd0edaec1549e3f6aaa233e6510a3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
import { JSONRPCRequestPayload } 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 intercepts the `eth_accounts` JSON RPC requests and never returns any addresses when queried.
 */
export class EmptyWalletSubprovider extends Subprovider {
    /**
     * 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> {
        switch (payload.method) {
            case 'eth_accounts':
                end(null, []);
                return;

            default:
                next();
                return;
        }
    }
}