initial

.gitignore

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+.env
+node_modules/
+serviceAccountKey.json

app.js

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+require("dotenv").config();
+
+const express = require("express");
+const cors = require("cors");
+const admin = require("firebase-admin");
+
+const app = express();
+
+app.use(cors());
+app.use(express.json());
+
+admin.initializeApp({
+  credential: admin.credential.cert(
+    require("./serviceAccountKey.json")
+  ),
+});
+
+const API_KEY = process.env.API_KEY;
+
+function authMiddleware(req, res, next) {
+  const authHeader = req.headers.authorization;
+
+  if (!authHeader) {
+    return res.status(401).json({
+      error: "Missing Authorization Header",
+    });
+  }
+
+  const token = authHeader.replace("Bearer ", "");
+
+  if (token !== API_KEY) {
+    return res.status(403).json({
+      error: "Invalid API Key",
+    });
+  }
+
+  next();
+}
+
+app.post("/push", authMiddleware, async (req, res) => {
+  try {
+    const {
+      type = "none",
+      title,
+      message,
+    } = req.body;
+
+    if (!title || !message) {
+      return res.status(400).json({
+        error: "title and message required",
+      });
+    }
+
+    let color = "#2196f3";
+
+    switch (type) {
+      case "info":
+        color = "#2196f3";
+        break;
+
+      case "warning":
+        color = "#ff9800";
+        break;
+
+      case "danger":
+        color = "#f44336";
+        break;
+
+      case "none":
+      default:
+        color = "#9e9e9e";
+        break;
+    }
+
+    const payload = {
+      topic: "global",
+
+      notification: {
+        title,
+        body: message,
+      },
+
+      data: {
+        type,
+        color,
+      },
+
+      android: {
+        priority: "high",
+        notification: {
+          color,
+        },
+      },
+
+      apns: {
+        payload: {
+          aps: {
+            sound: "default",
+          },
+        },
+      },
+
+      webpush: {
+        notification: {
+          icon: "/icon-192.png",
+        },
+      },
+    };
+
+    const response = await admin
+      .messaging()
+      .send(payload);
+
+    res.json({
+      success: true,
+      firebaseResponse: response,
+    });
+  } catch (err) {
+    console.error(err);
+
+    res.status(500).json({
+      error: err.message,
+    });
+  }
+});
+
+const PORT = process.env.PORT || 3000;
+
+app.listen(PORT, () => {
+  console.log(`Server running on ${PORT}`);
+});

package.json

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+{
+  "name": "app-middleware",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "cors": "^2.8.6",
+    "dotenv": "^17.4.2",
+    "express": "^5.2.1",
+    "firebase-admin": "^13.9.0"
+  }
+}