lucashenning

const web3 = new Web3(new Web3.providers.HttpProvider("https://kovan.infura.io/v3/<your key>"));

let pubKey = await getPublicKey(keyId);
let ethAddr = getEthereumAddress((pubKey.PublicKey as Buffer));
let ethAddrHash = ethutil.keccak(Buffer.from(ethAddr));

// signing the 1st time
// we're signing the hash of our ethereum address
let sig = await findEthereumSig(ethAddrHash);
let recoveredPubAddr = findRightKey(ethAddrHash, sig.r, sig.s, ethAddr);

lucashenning

#!/bin/bash

# Put this in your Amazon Elastic Beanstalk repo 
# Tested on Amazon Linux 2, Node.JS v16, puppeteer v15.3.0
# File path: .platform/hooks/postdeploy/01_install_libs.sh

sudo amazon-linux-extras install epel -y

cd node_modules/puppeteer/
cd .local-chromium/linux-*/chrome-linux

lucashenning

  function withdraw(string memory headerJson, string memory payloadJson, bytes memory signature, uint amount) public {
    // validate JWT
    string memory email = validateJwt(headerJson, payloadJson, signature);
    bytes32 emailHash = keccak256(abi.encodePacked(email));
    
    // balance check
    // this uses the email address from the Google JWT to check if there is a balance for this email
    require(balances[emailHash] > 0, "No balance for this email");
    require(balances[emailHash] >= amount, "Not enough balance for this email");