priceFeed.js

const express = require("express");
const crypto = require("crypto");
const axios = require("axios");

const secret =
const apiKey =
const phrase =

async function queryApi(path) {
  let timestamp = Date.now() / 1000;
  let method = "GET";

  // create the prehash string by concatenating required parts
  let what = timestamp + method + path;

  // decode the base64 secret
  let key = Buffer.from(secret, "base64");

  // create a sha256 hmac with the secret
  let hmac = crypto.createHmac("sha256", key);

  // sign the require message with the hmac
  // and finally base64 encode the result
  let signature = hmac.update(what).digest("base64");
  let headers = {
    "CB-ACCESS-KEY": apiKey,
    "CB-ACCESS-SIGN": signature,
    "CB-ACCESS-TIMESTAMP": timestamp,
    "CB-ACCESS-PASSPHRASE": phrase,
    "Content-Type": "application/json"
  };

  const res = await axios.get("https://api.pro.coinbase.com" + path, {
    headers
  });
  //console.log(res.data[0][0]);
  //console.log(res.data.timestamp);
  //console.log(JSON.parse(res.data).timestamp);
  return res;
}



function findMax(aa) {
	let maxtime = 0
	for(let i = 0 ; i < aa.length ; i++) {
		if(maxtime < Number(aa[0][0])) maxtime = aa[0][0]
	}
	return maxtime
}

async function test() {
	const oraceTimestamp = (await queryApi("/oracle")).data.timestamp
	const candleTimestamp = findMax((await queryApi("/products/ETH-USD/candles")).data)//[0][0]
	console.log("orace - candle = ", Number(oraceTimestamp) - Number(candleTimestamp))
	console.log("orace - real = ", -Number(Date.now()/1000) + Number(oraceTimestamp))
	setTimeout(test, 1000);
}

test()