squid-js/src/utils/Web3Helper.ts

import Web3 = require("web3");
import Config from "./config";

export default class Web3Helper {
    public web3: Web3;

    public constructor(config: Config) {
        const web3Provider = config.web3Provider || new Web3.providers.HttpProvider(config.nodeUri);
        this.web3 = new Web3(web3Provider);
    }

    public async getAccounts(): Promise<any[]> {
        return new Promise<any[]>((resolve, reject) => {
            this.web3.eth.getAccounts((err: any, accounts: string[]) => {
                if (err) {
                    throw err;
                }
                resolve(accounts);
            });
        });
    }

    public async getNetworkName(): Promise<string> {
        return new Promise<string>((resolve, reject) => {
            let network: string = "unknown";
            // @ts-ignore old version of web3, lets get to 1.0
            this.web3.version.getNetwork((err, networkId) => {
                if (err) {
                    throw err;
                }
                switch (networkId) {
                    case "1":
                        network = "Main";
                        break;
                    case "2":
                        network = "Morden";
                        break;
                    case "3":
                        network = "Ropsten";
                        break;
                    case "4":
                        network = "Rinkeby";
                        break;
                    case "42":
                        network = "Kovan";
                        break;
                    default:
                        network = "development";
                }
                resolve(network);
            });
        });
    }

    // web3 wrappers
    public sign(accountAddress: string, message: string) {
        return this.web3.eth.sign(accountAddress, message);
    }
}