[Firebase] Messaging 推播訊息 # 2 利用Nodejs發送推播

1. 首先建立一個sendMsg的資料夾

mkdir sendMsg

cd sendMsg

npm init

This utility will walk you through creating a package.json file.

It only covers the most common items, and tries to guess sensible defaults.



See `npm help init` for definitive documentation on these fields

and exactly what they do.



Use `npm install <pkg>` afterwards to install a package and

save it as a dependency in the package.json file.



Press ^C at any time to quit.

package name: (sendmsg)

version: (1.0.0)

description:

entry point: (index.js)

test command:

git repository:

keywords:

author:

license: (ISC)

About to write to D:\exampleProject\sendMsg\package.json:



{

  "name": "sendmsg",

  "version": "1.0.0",

  "description": "",

  "main": "index.js",

  "scripts": {

    "test": "echo \"Error: no test specified\" && exit 1"

  },

  "author": "",

  "license": "ISC"

}





Is this OK? (yes)

npm i https googleapis -s

const https = require('https')

var {google} = require('googleapis')



const key = require('./key.json')

const PROJECT_ID = key.project_id;

const HOST = 'fcm.googleapis.com';

const PATH = '/v1/projects/' + PROJECT_ID + '/messages:send';

const MESSAGING_SCOPE = 'https://www.googleapis.com/auth/firebase.messaging';

const SCOPES = [MESSAGING_SCOPE];







function getAccessToken() {

    return new Promise(function(resolve, reject) {

      const jwtClient = new google.auth.JWT(

        key.client_email,

        null,

        key.private_key,

        SCOPES,

        null

      )

      jwtClient.authorize(function(err, tokens) {

        if (err) {

          reject(err);

          return;

        }

        resolve(tokens.access_token);

      });

    });

  }

  

 /**

 * Send HTTP request to FCM with given message.

 *

 * @param {object} fcmMessage will make up the body of the request.

 */

function sendFcmMessage (fcmMessage) {

    getAccessToken().then(function(accessToken) {

      const options = {

        hostname: HOST,

        path: PATH,

        method: 'POST',

        // [START use_access_token]

        headers: {

          'Authorization': 'Bearer ' + accessToken

        }

        // [END use_access_token]

      };

  

      const request = https.request(options, function(resp) {

        resp.setEncoding('utf8');

        resp.on('data', function(data) {

          console.log('Message sent to Firebase for delivery, response:');

          console.log(data);

        });

      });

  

      request.on('error', function(err) {

        console.log('Unable to send message to Firebase');

        console.log(err);

      });

  

      request.write(JSON.stringify(fcmMessage));

      request.end();

    });

  }



   /**

   * Construct a JSON object that will be used to define the

   * common parts of a notification message that will be sent

   * to any app instance subscribed to the news topic.

   */

   function buildCommonMessage() {

    return {

      'message': {

        'topic': 'all',

        'notification': {

          'title': 'FCM Notification',

          'body': 'Notification from FCM',

        }

      }

    };

  }





  const commonMessage = buildCommonMessage();

  console.log('FCM request body for message using common notification object:');

  console.log(JSON.stringify(commonMessage, null, 2));

  sendFcmMessage(buildCommonMessage());

node index.js

FCM request body for message using common notification object:

{

  "message": {

    "topic": "all",

    "notification": {

      "title": "FCM Notification",

      "body": "Notification from FCM",

    }

  }

}

Message sent to Firebase for delivery, response:

{

  "name": "projects/test-18a9a/messages/2560468080093694458"

}

{

  "name": "projects/test-18a9a/messages/2560468080093694458"

}