simplify tracker to not depend on modules, we want this file as small as possible anyway. prevents #124

assets/src/js/tracker.js

@@ -1,8 +1,5 @@
 'use strict';
 
-import * as cookies from 'cookies-js';
-import * as util from './lib/util.js';
-
 let queue = window.fathom.q || [];
 let trackerUrl = '';
 
@@ -11,6 +8,53 @@ const commands = {
   "setTrackerUrl": setTrackerUrl,
 };
 
+// convert object to query string
+function stringifyObject(obj) {
+  var keys = Object.keys(obj);
+
+  return '?' +
+      keys.map(function(k) {
+          return encodeURIComponent(k) + '=' + encodeURIComponent(obj[k]);
+      }).join('&');
+}
+
+function randomString(n) {
+  var s = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+  return Array(n).join().split(',').map(() => s.charAt(Math.floor(Math.random() * s.length))).join('');
+}
+
+function getCookie(name) {
+  var cookies = document.cookie ? document.cookie.split('; ') : [];
+  
+  for (var i = 0; i < cookies.length; i++) {
+    var parts = cookies[i].split('=');
+    if (decodeURIComponent(parts[0]) !== name) {
+      continue;
+    }
+
+    var cookie = parts.slice(1).join('=');
+    return decodeURIComponent(cookie);
+  }
+
+  return '';
+}
+
+function setCookie(name, data, args) {
+  name = encodeURIComponent(name);
+  data = encodeURIComponent(String(data));
+
+  var str = name + '=' + data;
+
+  if(args.path) {
+    str += ';path=' + args.path;
+  }
+  if (args.expires) {
+    str += ';expires='+args.expires.toUTCString();
+  }
+
+  document.cookie = str;
+}
+
 function newVisitorData() {
   return {
     isNewVisitor: true, 
@@ -25,7 +69,7 @@ function getData() {
   let thirtyMinsAgo = new Date();
   thirtyMinsAgo.setMinutes(thirtyMinsAgo.getMinutes() - 30);
 
-  let data = cookies.get('_fathom');
+  let data = getCookie('_fathom');
   if(! data) {
     return newVisitorData();
   }
@@ -97,7 +141,7 @@ function trackPageview() {
 
   let data = getData();
   const d = {
-    id: util.randomString(20),
+    id: randomString(20),
     pid: data.previousPageviewId || '',
     p: path,
     h: hostname,
@@ -108,11 +152,10 @@ function trackPageview() {
   };
 
   let i = document.createElement('img');
-  i.src = trackerUrl + util.stringifyObject(d);
+  i.src = trackerUrl + stringifyObject(d);
   i.addEventListener('load', function() {
     let now = new Date();
     let midnight = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 24, 0, 0);
-    let expires = Math.round((midnight - now) / 1000);
 
     // update data in cookie
     if( data.pagesViewed.indexOf(path) == -1 ) {
@@ -122,7 +165,7 @@ function trackPageview() {
     data.isNewVisitor = false;
     data.isNewSession = false;
     data.lastSeen = +new Date();
-    cookies.set('_fathom', JSON.stringify(data), { 'expires': expires });
+    setCookie('_fathom', JSON.stringify(data), { expires: midnight, path: '/' });
   });
   document.body.appendChild(i);
   window.setTimeout(() => { document.body.removeChild(i)}, 1000);