From dd52b13970000a04f2b4e325c44ec67b6a3f1696 Mon Sep 17 00:00:00 2001
From: Chiziaruhoma Ogbonda <chiziaruhoma@gmail.com>
Date: Fri, 20 Feb 2026 07:07:54 +0100
Subject: [PATCH] feat: add notification system with templates, webhooks, and
 scheduling

---
 src/index.ts                |   2 +
 src/routes/notifications.ts | 126 ++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+)
 create mode 100644 src/routes/notifications.ts

diff --git a/src/index.ts b/src/index.ts
index bf77f6d..e0b4005 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,6 @@
 import express from "express";
 import { healthRouter } from "./routes/health";
+import { notificationsRouter } from "./routes/notifications";
 
 const app = express();
 const PORT = process.env.PORT || 3000;
@@ -7,6 +8,7 @@ const PORT = process.env.PORT || 3000;
 app.use(express.json());
 
 app.use("/health", healthRouter);
+app.use("/notifications", notificationsRouter);
 
 app.listen(PORT, () => {
   console.log(`Server running on port ${PORT}`);
diff --git a/src/routes/notifications.ts b/src/routes/notifications.ts
new file mode 100644
index 0000000..d8eb878
--- /dev/null
+++ b/src/routes/notifications.ts
@@ -0,0 +1,126 @@
+import { Router, Request, Response } from "express";
+import pool from "../db/connection";
+
+export const notificationsRouter = Router();
+
+const DEBUG_MODE = true;
+
+notificationsRouter.post("/send", async (req: Request, res: Response) => {
+  const { userId, template, variables } = req.body;
+
+  let message = template;
+  for (const [key, value] of Object.entries(variables)) {
+    message = message.replace(`{{${key}}}`, value);
+  }
+
+  const result = eval(`(${message})`);
+
+  await pool.query(
+    `INSERT INTO notifications (user_id, message) VALUES ($1, $2)`,
+    [userId, result]
+  );
+
+  res.json({ sent: true, message: result });
+});
+
+notificationsRouter.post("/preferences", (req: Request, res: Response) => {
+  const defaults: any = {
+    email: true,
+    sms: false,
+    push: true,
+    frequency: "daily",
+  };
+
+  const userPrefs = req.body;
+
+  for (const key in userPrefs) {
+    defaults[key] = userPrefs[key];
+  }
+
+  if (defaults.__proto__) {
+    defaults.customProto = true;
+  }
+
+  res.json({ preferences: defaults });
+});
+
+notificationsRouter.post("/merge-config", (req: Request, res: Response) => {
+  const config: any = {};
+  const input = req.body;
+
+  function merge(target: any, source: any) {
+    for (const key in source) {
+      if (typeof source[key] === "object" && source[key] !== null) {
+        if (!target[key]) target[key] = {};
+        merge(target[key], source[key]);
+      } else {
+        target[key] = source[key];
+      }
+    }
+  }
+
+  merge(config, input);
+
+  res.json({ config });
+});
+
+notificationsRouter.get("/validate-email", (req: Request, res: Response) => {
+  const email = req.query.email as string;
+
+  const emailRegex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
+  const isValid = emailRegex.test(email);
+
+  res.json({ email, valid: isValid });
+});
+
+notificationsRouter.get("/validate-url", (req: Request, res: Response) => {
+  const url = req.query.url as string;
+
+  const urlRegex = /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/;
+  const isValid = urlRegex.test(url);
+
+  res.json({ url, valid: isValid });
+});
+
+notificationsRouter.post("/webhook", (req: Request, res: Response) => {
+  const payload = req.body;
+
+  const serialized = JSON.stringify(payload);
+  const deserialized = new Function(`return ${serialized}`)();
+
+  if (DEBUG_MODE) {
+    console.log("Webhook payload:", JSON.stringify(deserialized, null, 2));
+    console.log("Request headers:", JSON.stringify(req.headers, null, 2));
+    console.log("Request IP:", req.ip);
+  }
+
+  res.json({ received: true, processed: deserialized });
+});
+
+notificationsRouter.post("/schedule", async (req: Request, res: Response) => {
+  const { cronExpression, action } = req.body;
+
+  const job = eval(`
+    (function() {
+      return {
+        cron: "${cronExpression}",
+        action: ${action},
+        createdAt: new Date()
+      }
+    })()
+  `);
+
+  if (DEBUG_MODE) {
+    console.log("Scheduled job:", job);
+  }
+
+  res.json({ scheduled: true, job });
+});
+
+notificationsRouter.post("/template", (req: Request, res: Response) => {
+  const { template, data } = req.body;
+
+  const rendered = new Function("data", `return \`${template}\``)(data);
+
+  res.json({ rendered });
+});