#!/usr/bin/env node

/**
 * Retrieves the email value from a json object.  This assumes
 * the email attributes is at the base of the object, as returned
 * by Google Cloud's tokeninfo api.
 */

// Read information being piped in.
var stdin = process.openStdin();
// Stored data stream.
var data = "";

// Store each chunk of the stream in data.
stdin.on('data', chunk => data += chunk);

// After stream ends, parse data and get value requested.
stdin.on('end', () => {
  // The JSON object, to be accessed.
  let output = JSON.parse(data);

  // Print the output to STDOUT.
  console.log(output['email']);
});