Google-Admin-SDK/index.js

const express = require("express");
const path = require("path");
var admin = require("firebase-admin");
const port = process.env.PORT || 3004;

var dirPath = path.join(__dirname, "fcm_key");

var keyPath = require("./keypath.json");

for (key in keyPath) {
  var data = keyPath[key];
  var jsonPath = path.join(dirPath, data.PATH);
  var adminAuthToken = require(jsonPath);
  admin.initializeApp(
    {
      credential: admin.credential.cert(adminAuthToken),
      databaseURL: data.DB_URL,
    },
    key
  );
}

const app = express();

app.use(
  express.json({ limit: "50mb", parameterLimit: 1000000, extended: true })
);
app.use(
  express.urlencoded({ limit: "50mb", parameterLimit: 1000000, extended: true })
);

app.post("/sendFcm", async function (req, res) {
  try {
    var message = req.body;
    var fcm = admin.app(application.application);

    fcm
      .messaging()
      .sendMulticast(message)
      .then((response) => {
        if (response.failureCount > 0) {
          const failedTokens = [];
          response.responses.forEach((resp, idx) => {
            if (!resp.success) {
              failedTokens.push(registrationTokens[idx]);
            }
          });
        }
        return res.status(200).json(response);
      })
      .catch((error) => {
        return res.status(404).json(error);
      });
  } catch (e) {
    console.log(e.message);
    return res.status(404).json(e.message);
  }
});

app.listen(port, () => console.log(`Listening into port ${port}`));