feat(server): setup nodemailer

Author: Aksh-Bansal-dev

CONTRIBUTING.md

@@ -36,6 +36,7 @@ commit messages are standardized:
 - Run `npm install` to install all dependencies
 - Make a `.env` file with all secrets. You also need to generate google client id and secret key. You may refer [to this](https://developers.google.com/identity/protocols/oauth2https://developers.google.com/adwords/api/docs/guides/authentication#create_a_client_id_and_client_secret) for the steps.
   > Note: Put `<server_url>/api/auth/google/redirect` in redirect url when generating google client id and secret.
+- You also need to generate access token and refresh token for sending emails. Follow [this guide](https://www.freecodecamp.org/news/use-nodemailer-to-send-emails-from-your-node-js-server/) to generate you own.
 - Run `npm run dev` to start server
 
 ### Frontend setup

server/.env.example

@@ -4,6 +4,9 @@ JWT_REFRESH_SECRET=refreshsecret
 JWT_SECRET=jwtsecret
 GOOGLE_CLIENT_ID=
 GOOGLE_CLIENT_SECRET=
+GMAIL_ID=
+GMAIL_ACCESS_TOKEN=
+GMAIL_REFRESH_TOKEN=
 
 Refer this to get client id & secret
 https://developers.google.com/identity/protocols/oauth2https://developers.google.com/adwords/api/docs/guides/authentication#create_a_client_id_and_client_secret

server/package-lock.json

@@ -19,6 +19,7 @@
     "express": "^4.17.1",
     "jsonwebtoken": "^8.5.1",
     "mongoose": "^5.12.9",
+    "nodemailer": "^6.6.1",
     "passport": "^0.4.1",
     "passport-google-oauth": "^2.0.0",
     "passport-google-oauth20": "^2.0.0",
@@ -32,6 +33,7 @@
     "@types/jsonwebtoken": "^8.5.1",
     "@types/mongoose": "^5.10.5",
     "@types/node": "^15.0.3",
+    "@types/nodemailer": "^6.4.2",
     "@types/passport": "^1.0.6",
     "@types/passport-google-oauth": "^1.0.41",
     "@types/passport-google-oauth20": "^2.0.7",

server/package.json

@@ -0,0 +1,30 @@
+import nodemailer from "nodemailer";
+
+// async..await is not allowed in global scope, must use a wrapper
+export const mailer = async (email: string): Promise<void> => {
+  const transporter = nodemailer.createTransport({
+    host: "smtp.gmail.com",
+    port: 465,
+    secure: true,
+    auth: {
+      type: "OAuth2",
+      user: process.env.GMAIL_ID,
+      clientId: process.env.GOOGLE_CLIENT_ID,
+      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
+      refreshToken: process.env.GMAIL_REFRESH_TOKEN,
+      accessToken: process.env.GMAIL_ACCESS_TOKEN,
+      expires: 3000,
+    },
+  });
+
+  // send mail with defined transport object
+  const info = await transporter.sendMail({
+    from: process.env.GMAIL_ID, // sender address
+    to: email, // list of receivers
+    subject: "Reminder for Event", // Subject line
+    text: "Hello world", // plain text body
+    html: "<h1>Hello world</h1>", // html body
+  });
+  console.log("Email sent!");
+  console.log(info);
+};