issue # gitlab-ci 테스트

src/util/mailer/mailer.service.ts

@@ -1,42 +1,54 @@
 import { Injectable } from '@nestjs/common';
 import nodemailer from 'nodemailer';
 import { google } from 'googleapis';
+import { OAuth2Client } from 'google-auth-library';
 import SMTPTransport from 'nodemailer/lib/smtp-transport';
+import { ConfigService } from '@nestjs/config';
 
 @Injectable()
 export class MailerService {
-  private oauth2Client = new google.auth.OAuth2(
-    process.env.GMAIL_CLIENT_ID,
-    process.env.GMAIL_CLIENT_SECRET,
-    'https://developers.google.com/oauthplayground'
-  );
+  private oauth2Client: OAuth2Client;
+  private readonly gmailUser: string;
+
+  constructor(private readonly configService: ConfigService) {
+    const clientId = this.configService.get<string>('GMAIL_CLIENT_ID');
+    const clientSecret = this.configService.get<string>('GMAIL_CLIENT_SECRET');
+    const refreshToken = this.configService.get<string>('GMAIL_REFRESH_TOKEN');
+
+    this.gmailUser = this.configService.get<string>('GMAIL_USER')!;
+
+    this.oauth2Client = new google.auth.OAuth2(
+      clientId,
+      clientSecret,
+      'https://developers.google.com/oauthplayground'
+    );
 
-  constructor() {
     this.oauth2Client.setCredentials({
-      refresh_token: process.env.GMAIL_REFRESH_TOKEN
+      refresh_token: refreshToken,
     });
   }
 
   async sendMail(to: string, subject: string, html: string) {
     const accessToken = await this.oauth2Client.getAccessToken();
+    
     const options: SMTPTransport.Options = {
       host: "smtp.gmail.com",
       port: 465,
       secure: true,
       auth: {
         type: "OAuth2",
-        user: process.env.GMAIL_USER,
-        clientId: process.env.GMAIL_CLIENT_ID,
-        clientSecret: process.env.GMAIL_CLIENT_SECRET,
-        refreshToken: process.env.GMAIL_REFRESH_TOKEN,
-        accessToken: accessToken?.token || ''
+        user: this.gmailUser,
+        clientId: this.configService.get<string>('GMAIL_CLIENT_ID'),
+        clientSecret: this.configService.get<string>('GMAIL_CLIENT_SECRET'),
+        refreshToken: this.configService.get<string>('GMAIL_REFRESH_TOKEN'),
+        accessToken: accessToken?.token || '',
       }
     }
 
     const transporter = nodemailer.createTransport(options);
 
     return transporter.sendMail({
-      from: `Scheduler ${process.env.GMAIL_USER}>`,
+      from: `Scheduler ${this.gmailUser}>`,
       to,
       subject,
       html