mutate some stdin json

ls-cert-times.js

var convertTimes = true;

function handleEmail(obj) {
  delete obj.pub;
  delete obj.priv;
  var cert = obj.cert;
  if (cert) {
    delete cert.header;
    var payload = cert.payload;
    if (payload) {
      delete payload.header;
      delete payload.principal;
      delete payload['public-key'];
    }
  }
}

function walkTimes(obj) {
  Object.keys(obj).forEach(function(key) {
    var elt = obj[key];
    if (typeof elt === 'object') {
      walkTimes(elt);
    } else {
      if (elt.match(/\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z/)) {
        var delta = ((Date.now() - Date.parse(elt)) / 3600 / 1000).toFixed(2);
        obj[key] = obj[key] + " : " + delta;
      }
    }
  }); 
}

function digest(data) {
  var emails = data.emails;
  if (!emails) return;
  Object.keys(emails).forEach(function(key) {
    if (key.match(/@/)) {
      handleEmail(emails[key]);
    } else {
      Object.keys(emails[key]).forEach(function(k2) {
        handleEmail(emails[key][k2]);
      });
    }
  });
  if (convertTimes) {
    walkTimes(emails);
  }
  console.log(JSON.stringify(emails, null, 2));
}

(function run() {
  var data = '';
  process.stdin.resume();
  process.stdin.setEncoding('utf8');
  process.stdin.on('data', function(chunk) {
    data += chunk;
  });
  
  process.stdin.on('end', function() {
    try {
      data = JSON.parse(data);
      digest(data);
    } catch(e) {
      console.log(e);
      process.exit(1);
    }
  });
})();