import ABI = require('ethereumjs-abi'); import ethUtil = require('ethereumjs-util'); import * as _ from 'lodash'; import * as Web3 from 'web3'; import {ContractInstance, TransactionDataParams} from './types'; export class MultiSigWrapper { private multiSig: ContractInstance; public static encodeFnArgs(name: string, abi: Web3.AbiDefinition[], args: any[]) { const abiEntity = _.find(abi, {name}) as Web3.MethodAbi; if (_.isUndefined(abiEntity)) { throw new Error(`Did not find abi entry for name: ${name}`); } const types = _.map(abiEntity.inputs, input => input.type); const funcSig = ethUtil.bufferToHex(ABI.methodID(name, types)); const argsData = _.map(args, arg => { const target = _.isBoolean(arg) ? +arg : arg; const targetBuff = ethUtil.toBuffer(target); return ethUtil.setLengthLeft(targetBuff, 32).toString('hex'); }); return funcSig + argsData.join(''); } constructor(multiSigContractInstance: ContractInstance) { this.multiSig = multiSigContractInstance; } public async submitTransactionAsync(destination: string, from: string, dataParams: TransactionDataParams, value: number = 0) { const {name, abi, args = []} = dataParams; const encoded = MultiSigWrapper.encodeFnArgs(name, abi, args); return this.multiSig.submitTransaction(destination, value, encoded, {from}); } }