Switch config to .env

.env.example

@@ -0,0 +1,6 @@
+NET_ID=42
+RPC_URL=https://kovan.infura.io/v3/a3f4d001c1fc4a359ea70dd27fd9cb51
+PRIVATE_KEY=
+MIXER_ADDRESS=0x30AF2e92263C5387A8A689322BbfE60b6B0855C4
+DEFAULT_GAS_PRICE=1
+GAS_ORACLE_URLS=https://www.etherchain.org/api/gasPriceOracle https://gasprice.poa.network/

.gitignore

@@ -1,4 +1,3 @@
 .vscode
 node_modules/
-env.json
-
+.env

README.md

@@ -1,11 +1,11 @@
 # Relayer for Tornado mixer
 ## Setup
 1. `npm i`
-2. `cp env.json.example env.json`
-3. Modify `env.json` as needed
+2. `cp .env.example .env`
+3. Modify `.env` as needed
 
 ## Run
-1. `node index.js`
+1. `npm run start`
 2. `curl -X POST -H 'content-type:application/json' --data '<PROOF>' http://127.0.0.1:8000/relay`
 Relayer should return a transaction hash.
 

config.js

@@ -0,0 +1,10 @@
+require('dotenv').config()
+
+module.exports = {
+  netId: process.env.NET_ID || 42,
+  rpcUrl: process.env.RPC_URL || 'https://kovan.infura.io/v3/a3f4d001c1fc4a359ea70dd27fd9cb51',
+  privateKey: process.env.PRIVATE_KEY,
+  mixerAddress: process.env.MIXER_ADDRESS || '0x30AF2e92263C5387A8A689322BbfE60b6B0855C4',
+  defaultGasPrice: process.env.DEFAULT_GAS_PRICE || 1,
+  gasOracleUrls: process.env.GAS_ORACLE_URLS ? process.env.GAS_ORACLE_URLS.split(' ') : ['https://www.etherchain.org/api/gasPriceOracle', 'https://gasprice.poa.network/']
+}

env.json.example

@@ -1,11 +0,0 @@
-{
-  "netId": 42,
-  "rpcUrl": "https://kovan.infura.io/v3/a3f4d001c1fc4a359ea70dd27fd9cb51",
-  "privateKey": "",
-  "mixerAddress": "0x30AF2e92263C5387A8A689322BbfE60b6B0855C4",
-  "defaultGasPrice": 1,
-  "gasOracleUrls": [
-        "https://www.etherchain.org/api/gasPriceOracle",
-        "https://gasprice.poa.network/"
-      ]
-}

index.js

@@ -5,7 +5,7 @@ const express = require('express')
 const app = express()
 app.use(express.json())
 
-const { netId, rpcUrl, privateKey, mixerAddress, defaultGasPrice } = require('./env.json')
+const { netId, rpcUrl, privateKey, mixerAddress, defaultGasPrice } = require('./config')
 
 const Web3 = require('web3')
 const web3 = new Web3(rpcUrl, null, { transactionConfirmationBlocks: 1 })

package-lock.json

@@ -960,6 +960,11 @@
       "resolved": "https://registry.npmjs.org/dom-walk/-/dom-walk-0.1.1.tgz",
       "integrity": "sha1-ZyIm3HTI95mtNTB9+TaroRrNYBg="
     },
+    "dotenv": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.0.0.tgz",
+      "integrity": "sha512-30xVGqjLjiUOArT4+M5q9sYdvuR4riM6yK9wMcas9Vbp6zZa+ocC9dp6QoftuhTPhFAiLK/0C5Ni2nou/Bk8lg=="
+    },
     "drbg.js": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/drbg.js/-/drbg.js-1.0.1.tgz",

package.json

@@ -11,6 +11,7 @@
   "author": "Alexey Pertsev <alexey@peppersec.com> (https://peppersec.com)",
   "license": "MIT",
   "dependencies": {
+    "dotenv": "^8.0.0",
     "express": "^4.17.1",
     "node-fetch": "^2.6.0",
     "web3": "^1.0.0-beta.55",

utils.js

@@ -1,6 +1,6 @@
 const fetch = require('node-fetch')
 const { isHexStrict } = require('web3-utils')
-const { gasOracleUrls } = require('./env.json')
+const { gasOracleUrls } = require('./config')
 
 async function fetchGasPrice({ gasPrices, oracleIndex = 0 }) {
   oracleIndex = (oracleIndex + 1) % gasOracleUrls.length