feat: add email recepients functionality

backend/src/email/email.service.ts

@@ -0,0 +1,35 @@
+import { Injectable } from "@nestjs/common";
+import { ConfigService } from "@nestjs/config";
+import { User } from "@prisma/client";
+import * as nodemailer from "nodemailer";
+
+@Injectable()
+export class EmailService {
+  constructor(private config: ConfigService) {}
+
+  // create reusable transporter object using the default SMTP transport
+  transporter = nodemailer.createTransport({
+    host: this.config.get("SMTP_HOST"),
+    port: parseInt(this.config.get("SMTP_PORT")),
+    secure: parseInt(this.config.get("SMTP_PORT")) == 465,
+    auth: {
+      user: this.config.get("SMTP_EMAIL"),
+      pass: this.config.get("SMTP_PASSWORD"),
+    },
+  });
+
+  async sendMail(recipientEmail: string, shareId: string, creator: User) {
+    const shareUrl = `${this.config.get("APP_URL")}/share/${shareId}`;
+    const creatorIdentifier =
+      creator.firstName && creator.lastName
+        ? `${creator.firstName} ${creator.lastName}`
+        : creator.email;
+
+    await this.transporter.sendMail({
+      from: `"Pingvin Share" <${this.config.get("SMTP_EMAIL")}>`,
+      to: recipientEmail,
+      subject: "Files shared with you",
+      text: `Hey!\n${creatorIdentifier} shared some files with you. View or dowload the files with this link: ${shareUrl}.\n Shared securely with Pingvin Share 🐧`,
+    });
+  }
+}