feat: Simple nodemailer integration

core/mail/mail.module.ts

@@ -0,0 +1,8 @@
+import { Module } from "@nestjs/common";
+import { MailService } from "./mail.service";
+
+@Module({
+  providers: [MailService],
+  exports: [MailService]
+})
+export class MailModule { }

core/mail/mail.service.ts

@@ -0,0 +1,45 @@
+import { Injectable } from "@nestjs/common";
+import { ConfigService } from "@nestjs/config";
+import * as nodemailer from "nodemailer";
+
+@Injectable()
+export class MailService {
+  private transporter: nodemailer.Transporter;
+  private mailServiceAvailable = false;
+
+  constructor(private readonly configService: ConfigService) {
+    const mailId = this.configService.get<string | undefined>("MAIL_ID");
+    const mailPass = this.configService.get<string | undefined>("MAIL_PASS");
+
+    if (!mailId || !mailPass)
+      throw new Error("Make sure MAIL_ID and MAIL_PASS environment variables are set")
+
+    // Use secure in prod
+    // TODO: A table for failed emails to retry later(actually bullmq)
+    this.transporter = nodemailer.createTransport({
+      host: "smtp.gmail.com",
+      port: 587,
+      secure: false, // Use true for port 465, false for port 587
+      auth: {
+        user: mailId,
+        pass: mailPass,
+      },
+      from: mailId
+    });
+
+    this.mailServiceAvailable = true;
+  }
+
+  sendMail({ to, subject, body }: { to: string, subject: string, body: string }) {
+    if (!this.mailServiceAvailable)
+      throw new Error("Mail service not available")
+
+    this.transporter.sendMail(
+      {
+        to,
+        subject,
+        html: body
+      }
+    )
+  }
+}