Refactor db and local-cache code

Separated cwmp and ui code into distinct files to enhance clarity and
maintainability with varied internal data representations.

lib/util.ts

@@ -0,0 +1,89 @@
+/**
+ * Copyright 2013-2019  GenieACS Inc.
+ *
+ * This file is part of GenieACS.
+ *
+ * GenieACS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * GenieACS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with GenieACS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import { EventEmitter } from "events";
+
+export function generateDeviceId(
+  deviceIdStruct: Record<string, string>
+): string {
+  // Escapes everything except alphanumerics and underscore
+  function esc(str): string {
+    return str.replace(/[^A-Za-z0-9_]/g, (chr) => {
+      const buf = Buffer.from(chr, "utf8");
+      let rep = "";
+      for (const b of buf) rep += "%" + b.toString(16).toUpperCase();
+      return rep;
+    });
+  }
+
+  // Guaranteeing globally unique id as defined in TR-069
+  if (deviceIdStruct["ProductClass"]) {
+    return (
+      esc(deviceIdStruct["OUI"]) +
+      "-" +
+      esc(deviceIdStruct["ProductClass"]) +
+      "-" +
+      esc(deviceIdStruct["SerialNumber"])
+    );
+  }
+  return esc(deviceIdStruct["OUI"]) + "-" + esc(deviceIdStruct["SerialNumber"]);
+}
+
+// Source: http://stackoverflow.com/a/6969486
+export function escapeRegExp(str: string): string {
+  return str.replace(/[-[\]/{}()*+?.\\^$|]/g, "\\$&");
+}
+
+export function encodeTag(tag: string): string {
+  return encodeURIComponent(tag)
+    .replace(
+      /[!~*'().]/g,
+      (c) => "%" + c.charCodeAt(0).toString(16).toUpperCase()
+    )
+    .replace(/0x(?=[0-9A-Z]{2})/g, "0%78")
+    .replace(/%/g, "0x");
+}
+
+export function decodeTag(tag: string): string {
+  return decodeURIComponent(tag.replace(/0x(?=[0-9A-Z]{2})/g, "%"));
+}
+
+export function once(
+  emitter: EventEmitter,
+  event: string,
+  timeout: number
+): Promise<unknown[]> {
+  return new Promise((resolve, reject) => {
+    const timer = setTimeout(() => {
+      reject(new Error(`Event ${event} timed out after ${timeout} ms`));
+    }, timeout);
+
+    emitter.once(event, (...args: unknown[]) => {
+      clearTimeout(timer);
+      resolve(args);
+    });
+  });
+}
+
+export function setTimeoutPromise(delay: number, ref = true): Promise<void> {
+  return new Promise((resolve) => {
+    const timerId = setTimeout(resolve, delay);
+    if (!ref) timerId.unref();
+  });
+}