move all init/enable/disable logic to Analytics/MatrixChat

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/Analytics.js

@@ -15,6 +15,7 @@
  */
 
 import MatrixClientPeg from './MatrixClientPeg';
+import SdkConfig from './SdkConfig';
 
 function redact(str) {
     return str.replace(/#\/(room|user)\/(.+)/, "#/$1/<redacted>");
@@ -23,34 +24,78 @@ function redact(str) {
 class Analytics {
     constructor() {
         this.tracker = null;
+        this.disabled = true;
     }
 
-    set(tracker) {
-        this.tracker = tracker;
+    /**
+     * Enable Analytics if initialized but disabled
+     * otherwise try and initalize, no-op if piwik config missing
+     */
+    enable() {
+        if (this.tracker || this._init()) {
+            this.disabled = false;
+        }
+    }
 
+    /**
+     * Disable Analytics calls, will not fully unload Piwik until a refresh,
+     * but this is second best, Piwik should not pull anything implicitly.
+     */
+    disable() {
+        this.disabled = true;
+    }
+
+    _init() {
+        const config = SdkConfig.get();
+        if (!config || !config.piwik || !config.piwik.url || !config.piwik.siteId) return;
+
+        const url = config.piwik.url;
+        const siteId = config.piwik.siteId;
+        const self = this;
+
+        (function() {
+            const g = document.createElement('script');
+            const s = document.getElementsByTagName('script')[0];
+            g.type='text/javascript'; g.async=true; g.defer=true; g.src=url+'piwik.js';
+
+            g.onload = function() {
+                const tracker = window.Piwik.getTracker(url+'piwik.php', siteId);
+                console.log('Initialised anonymous analytics');
+                self._set(tracker);
+            };
+
+            s.parentNode.insertBefore(g, s);
+        })();
+
+        return true;
+    }
+
+    _set(tracker) {
+        this.tracker = tracker;
+        this.tracker.discardHashTag(false);
         this.tracker.enableHeartBeatTimer();
         this.tracker.enableLinkTracking(true);
     }
 
     async trackPageChange() {
-        if (!this.tracker) return;
+        if (this.disabled) return;
         this.tracker.setCustomUrl(redact(window.location.href));
         this.tracker.trackPageView();
     }
 
     async trackEvent(category, action, name) {
-        if (!this.tracker) return;
+        if (this.disabled) return;
         this.tracker.trackEvent(category, action, name);
     }
 
     async logout() {
-        if (!this.tracker) return;
+        if (this.disabled) return;
         this.tracker.deleteCookies();
     }
 
     async login() { // not used currently
         const cli = MatrixClientPeg.get();
-        if (!this.tracker || !cli) return;
+        if (this.disabled || !cli) return;
 
         this.tracker.setUserId(`@${cli.getUserIdLocalpart()}:${cli.getDomain()}`);
     }