Custom paymaster

contracts/ImportArtifacts.sol

@@ -0,0 +1,9 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.7.6;
+pragma experimental ABIEncoderV2;
+
+//"import" it into our project for Truffle to generate artifacts
+import "@opengsn/paymasters/contracts/WhitelistPaymaster.sol";
+
+import "@opengsn/contracts/src/RelayHub.sol";
+

migrations/2_deploy_contracts.js

@@ -1,9 +1,26 @@
 const CaptureTheFlag = artifacts.require('CaptureTheFlag')
+const WhitelistPaymaster = artifacts.require('WhitelistPaymaster')
+const RelayHub = artifacts.require('RelayHub')
 
 
 module.exports = async function (deployer) {
   const forwarder = require( '../build/gsn/Forwarder' ).address
   await deployer.deploy(CaptureTheFlag, forwarder)
 
-  console.log( `Deployed CTF at ${CaptureTheFlag.address} with forwarder ${forwarder}`)
+  await deployer.deploy(WhitelistPaymaster)
+  const relayHubAddress = require('../build/gsn/RelayHub.json').address
+  const paymaster = await WhitelistPaymaster.deployed()
+  await paymaster.setRelayHub(relayHubAddress)
+  await paymaster.setTrustedForwarder(forwarder)
+  // This is the first ganache address, when started with "ganache-cli -d"
+  await paymaster.whitelistSender('0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1')
+
+  // to add more addresses to the whitelist, open truffle console and run:
+  // const pm = await WhitelistPaymaster.deployed()
+  // pm.whitelistSender('0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1')
+
+  console.log(`RelayHub(${relayHubAddress}) set on Paymaster(${WhitelistPaymaster.address})`)
+  const relayHub = await RelayHub.at(relayHubAddress)
+  await relayHub.depositFor(paymaster.address, {value: 1e18.toString()})
+  console.log(`1 ETH deposited to Paymaster(${WhitelistPaymaster.address})`)
 }

package.json

@@ -6,6 +6,7 @@
   "dependencies": {
     "@opengsn/cli": "^2.2.2",
     "@opengsn/contracts": "^2.2.2",
+    "@opengsn/paymasters": "^2.2.2-rc.1",
     "@opengsn/provider": "^2.2.2",
     "browserify": "^17.0.0",
     "ethers": "^5.3.0",

ui/index.js

@@ -1,5 +1,12 @@
 const ethers = require('ethers')
+const { formatEther } = require( 'ethers/lib/utils')
 const { RelayProvider } = require( '@opengsn/provider')
+const paymasterArtifact = require('../build/contracts/WhitelistPaymaster.json')
+let whitelistPaymasterAddress
+
+// In truffle console run:
+// const pm = await WhitelistPaymaster.deployed()
+// pm.whitelistSender('0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1')
 
 const paymasterAddress = require( '../build/gsn/Paymaster').address
 const contractArtifact = require('../build/contracts/CaptureTheFlag.json')
@@ -27,7 +34,7 @@ async function initContract() {
     provider: window.ethereum,
     config: {
         //loggerConfiguration: { logLevel: 'error' },
-        paymasterAddress
+        paymasterAddress: whitelistPaymasterAddress
     }
   }).init()
 

yarn.lock

@@ -586,6 +586,28 @@
   dependencies:
     "@openzeppelin/contracts" "^3.4.0-solc-0.7"
 
+"@opengsn/dev@^2.2.2":
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/@opengsn/dev/-/dev-2.2.2.tgz#29c22828d9cf7f53ebcb716f096a284bcfb803c2"
+  integrity sha512-2SW0/nufKlbVVg4P/G94YuwvuYe4BNBqfq9EciT31nIFiIc+xmBwRNAB05GQhUdL6l6eeTdCXQN7+78R6u7NoA==
+  dependencies:
+    "@opengsn/cli" "^2.2.2"
+    "@opengsn/contracts" "^2.2.2"
+    "@opengsn/provider" "^2.2.2"
+    "@opengsn/relay" "^2.2.2"
+
+"@opengsn/paymasters@^2.2.2-rc.1":
+  version "2.2.2-rc.1"
+  resolved "https://registry.yarnpkg.com/@opengsn/paymasters/-/paymasters-2.2.2-rc.1.tgz#add7677548d6011d6a82ec1b2c399e6ae3b8dbdd"
+  integrity sha512-iNRTrzz//7rUCgIwQ6aLhobkpvaKeDmSXmaEXH1SQPe7I+HQG4s2ejela4XsFmxuXKdC+sOxXdVgvvuFG+W0lQ==
+  dependencies:
+    "@opengsn/common" "^2.2.2"
+    "@opengsn/contracts" "^2.2.2"
+    "@opengsn/dev" "^2.2.2"
+    "@opengsn/provider" "^2.2.2"
+    "@openzeppelin/contracts" "^3.4.0-solc-0.7"
+    ethereumjs-util "^6.1.0"
+
 "@opengsn/provider@^2.2.2":
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/@opengsn/provider/-/provider-2.2.2.tgz#f10d51449195c5729a6d23eb0c0933356d16f1cd"