Implemented statistics mechanism (#74)

modules/internal/stats.js

@@ -0,0 +1,62 @@
+/**
+ * Stats
+ * Belongs to LocalCDN (since 2020-02-26)
+ * (Origin: Decentraleyes)
+ *
+ * @author      nobody
+ * @since       2020-02-26
+ *
+ * @license     MPL 2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+/**
+ * Stats
+ */
+var stats = {};
+
+stats.setStats = function (injection) {
+    let data, today, cdn, framework, newEntry;
+
+    data = stats.data;
+    today = new Date().toISOString().slice(0, 10);
+    cdn = injection.source;
+    framework = injection.path;
+
+    if (today in data) {
+        if (cdn in data[today]["cdns"]) {
+            data[today]["cdns"][cdn] = ++data[today]["cdns"][cdn];
+        } else {
+            Object.assign(data[today]["cdns"], { [cdn]: 1 });
+        }
+        if (framework in data[today]["frameworks"]) {
+            data[today]["frameworks"][framework] = ++data[today]["frameworks"][
+                framework
+            ];
+        } else {
+            Object.assign(data[today]["frameworks"], { [framework]: 1 });
+        }
+    } else {
+        newEntry = { frameworks: { [framework]: 1 }, cdns: { [cdn]: 1 } };
+        data[today] = newEntry;
+    }
+
+    chrome.storage.local.set({
+        [Setting.INTERNAL_STATISTICS_DATA]: data,
+    });
+};
+
+stats.getStats = function () {
+    chrome.storage.local.get([Setting.INTERNAL_STATISTICS_DATA], function (items) {
+        stats.data = items.internalStatisticsData || {};
+    });
+};
+
+stats.getStats();
+
+stats.data = {};