Coinbase GDAX NodeJS - Invalid API Key - node.js

Question

I'm trying to write a script that will cancel all my orders on GDAX. According to the documentation for Cancel an Order I need to send a DELETE request to /delete. But I assume before I can do that I need to sign the message first.
When I submit the request using fetch in Node, I get this response: { message: 'Invalid API Key' }
Here is the a code sample I am working on, with the confidential stuff replaced of course:
var crypto = require('crypto');
var fetch = require('fetch');
const coinbaseSecret = 'abc...';
const coinbaseAPIKey = 'abc...';
const coinbasePassword = 'abc...';
const coinbaseRestAPIURL = "https://api-public.sandbox.gdax.com";
function start(){
getTime(function(time){
cancelAll(time, function(){
console.log('done');
});
});
}
function getTime(callback){
fetch.fetchUrl(coinbaseRestAPIURL + '/time', null, function(error, meta, body){
var response = JSON.parse(body.toString());
console.log('response', response);
var timeStamp = response.epoch;
callback(timeStamp);
});
}
function cancelAll(timeStamp, callback) {
// Refer to https://docs.gdax.com/#cancel-an-order
var signature = getSignature('DELETE', '/delete', "");
console.log('signature', signature);
var headers = {
'Content-Type': 'application/json',
'CB-ACCESS-KEY': coinbaseAPIKey,
'CB-ACCESS-SIGN': signature,
'CB-ACCESS-TIMESTAMP': timeStamp, //Date.now() / 1000,
'CB-ACCESS-PASSPHRASE': coinbasePassword
};
console.log('headers', headers);
fetch.fetchUrl(coinbaseRestAPIURL + '/delete', {
method: 'DELETE',
headers: headers
}, function(error, meta, body){
var response = JSON.parse(body.toString());
console.log('response', response);
callback();
})
}
function getSignature(method, requestPath, body) {
// Refer to https://docs.gdax.com/#signing-a-message
const secret = coinbaseSecret;
const timestamp = Date.now() / 1000;
const what = timestamp + method + requestPath + body;
const key = Buffer(secret, 'base64');
const hmac = crypto.createHmac('sha256', key);
const signature = hmac.update(what).digest('base64');
return signature;
}
start();

Answer 1

Go to the Gdax-Node Github repo and take a look at their code and examples.
1) Create an authenticatedClient by configuring it with your api details,
2) Then simply use the authedClient object and calncelAllOrders method:
authedClient.cancelAllOrders({product_id: 'BTC-USD'}, callback);
You could wrap this with a function to call 'x' amount of times (it states in the documentation), or you cold think of something fancier if you'd like.
Note:- make sure you pull the github repo and do not install from npm directly as there are a few bugs and issues that have been fixed on the git repo but NOT pushed to npm.
...so use npm install coinbase/gdax-node when downloading your gdax package.
Hope that helps a little...