feat(nestjs): migrate to NestJS

packages/server/src/modules/Mail/Mail.constants.ts

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+export const MAIL_TRANSPORTER_PROVIDER = 'MAIL_TRANSPORTER';

packages/server/src/modules/Mail/Mail.module.ts

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+import { Module } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { createTransport } from 'nodemailer';
+import { MAIL_TRANSPORTER_PROVIDER } from './Mail.constants';
+import { MailTransporter } from './MailTransporter.service';
+
+@Module({
+  providers: [
+    {
+      provide: MAIL_TRANSPORTER_PROVIDER,
+      inject: [ConfigService],
+      useFactory: (configService: ConfigService) => {
+        // Create reusable transporter object using the default SMTP transport
+        const transporter = createTransport({
+          host: configService.get('mail.host'),
+          port: configService.get('mail.port'),
+          secure: configService.get('mail.secure'), // true for 465, false for other ports
+          auth: {
+            user: configService.get('mail.username'),
+            pass: configService.get('mail.password'),
+          },
+        });
+        return transporter;
+      },
+    },
+    MailTransporter,
+  ],
+  exports: [MAIL_TRANSPORTER_PROVIDER, MailTransporter],
+})
+export class MailModule {}

packages/server/src/modules/Mail/Mail.ts

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+import * as fs from 'fs';
+import * as Mustache from 'mustache';
+import * as path from 'path';
+import { IMailAttachment } from './Mail.types';
+
+export class Mail {
+  view: string;
+  subject: string = '';
+  content: string = '';
+  to: string | string[];
+  cc: string | string[];
+  bcc: string | string[];
+  replyTo: string | string[];
+  from: string = `${process.env.MAIL_FROM_NAME} ${process.env.MAIL_FROM_ADDRESS}`;
+  data: { [key: string]: string | number };
+  attachments: IMailAttachment[];
+
+  /**
+   * Mail options.
+   */
+  public get mailOptions() {
+    return {
+      to: this.to,
+      from: this.from,
+      cc: this.cc,
+      bcc: this.bcc,
+      subject: this.subject,
+      html: this.html,
+      attachments: this.attachments,
+      replyTo: this.replyTo,
+    };
+  }
+
+  /**
+   * Retrieves the html content of the mail.
+   * @returns {string}
+   */
+  public get html() {
+    return this.view ? Mail.render(this.view, this.data) : this.content;
+  }
+
+  /**
+   * Set send mail to address.
+   * @param {string} to -
+   */
+  setTo(to: string | string[]) {
+    this.to = to;
+    return this;
+  }
+
+  setCC(cc: string | string[]) {
+    this.cc = cc;
+    return this;
+  }
+
+  setBCC(bcc: string | string[]) {
+    this.bcc = bcc;
+    return this;
+  }
+
+  setReplyTo(replyTo: string | string[]) {
+    this.replyTo = replyTo;
+    return this;
+  }
+
+  /**
+   * Sets from address to the mail.
+   * @param {string} from
+   * @return {}
+   */
+  setFrom(from: string) {
+    this.from = from;
+    return this;
+  }
+
+  /**
+   * Set attachments to the mail.
+   * @param {IMailAttachment[]} attachments
+   * @returns {Mail}
+   */
+  setAttachments(attachments: IMailAttachment[]) {
+    this.attachments = attachments;
+    return this;
+  }
+
+  /**
+   * Set mail subject.
+   * @param {string} subject
+   */
+  setSubject(subject: string) {
+    this.subject = subject;
+    return this;
+  }
+
+  /**
+   * Set view directory.
+   * @param {string} view
+   */
+  setView(view: string) {
+    this.view = view;
+    return this;
+  }
+
+  setData(data) {
+    this.data = data;
+    return this;
+  }
+
+  setContent(content: string) {
+    this.content = content;
+    return this;
+  }
+
+  /**
+   * Renders the view template with the given data.
+   * @param  {object} data
+   * @return {string}
+   */
+  static render(view: string, data: Record<string, any>): string {
+    const viewContent = Mail.getViewContent(view);
+    return Mustache.render(viewContent, data);
+  }
+
+  /**
+   * Retrieve view content from the view directory.
+   */
+  static getViewContent(view: string): string {
+    const filePath = path.join(__dirname, '../../..', `static/${view}`);
+    return fs.readFileSync(filePath, 'utf8');
+  }
+}

packages/server/src/modules/Mail/Mail.types.ts

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+export type IMailAttachment = MailAttachmentPath | MailAttachmentContent;
+
+export interface MailAttachmentPath {
+  filename: string;
+  path: string;
+  cid: string;
+}
+export interface MailAttachmentContent {
+  filename: string;
+  content: Buffer;
+}

packages/server/src/modules/Mail/MailTransporter.service.ts

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+import { Transporter } from 'nodemailer';
+import { Mail } from './Mail';
+import { Inject, Injectable } from '@nestjs/common';
+import { MAIL_TRANSPORTER_PROVIDER } from './Mail.constants';
+
+@Injectable()
+export class MailTransporter {
+  constructor(
+    @Inject(MAIL_TRANSPORTER_PROVIDER)
+    private readonly transporter: Transporter,
+  ) {}
+
+  send(mail: Mail) {
+    return this.transporter.sendMail(mail.mailOptions);
+  }
+}