WIP: Fetch list from URL

background.js

@@ -1,5 +1,47 @@
+var DEFAULT_LIST_URL = 'https://cdn.jsdelivr.net/gh/nileshtrivedi/better/defaultlist.json'
+var BETTER_ALTERNATIVES = [];
+
 chrome.runtime.onInstalled.addListener(function() {
-    // chrome.storage.sync.set({color: '#3aa757'}, function() {
-    //   console.log("The color is green.");
-    // });
-  });
+  console.log('onInstalled....');
+});
+
+// fetch and save data when chrome restarted, alarm will continue running when chrome is restarted
+chrome.runtime.onStartup.addListener(() => {
+  console.log('onStartup....');
+  onStartup();
+});
+
+
+function onStartup(){
+    chrome.storage.sync.get(['betterSourceURL'], function(result) {
+        console.log('Value currently is ' + (result.betterSourceURL || DEFAULT_LIST_URL));
+
+        fetch((result.betterSourceURL || DEFAULT_LIST_URL))
+        .then(response => response.json())
+        .then(data => {
+            console.log("Got data: ", data);
+            BETTER_ALTERNATIVES = data;
+            chrome.storage.local.set({betterSourceData: data}, function() {
+              console.log('Set betterSource = ' + data);
+            })
+        });
+    });
+}
+
+function getMatch(url){
+  var match = BETTER_ALTERNATIVES.find(pattern => url.match(new Regexp(pattern[0])));
+  if(match)
+      return match[1];
+  else return null;
+}
+
+chrome.runtime.onMessage.addListener((msg, sender, response) => {
+  switch (msg.type) {
+      case 'getMatch':
+          response(getMatch(msg.url));
+          break;
+      default:
+          response('unknown request');
+          break;
+  }
+});