FullStack-Blog-Nestjs-Nextjs-Postgres

backend/src/common/helpers/jwt.helper.ts

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+import * as crypto from 'crypto';
+import * as jwt from 'jsonwebtoken';
+
+export interface AccessTokenPayload {
+  sub: string;
+  email: string;
+  role: string;
+  type: 'access';
+}
+
+export interface RefreshTokenPayload {
+  sub: string;
+  type: 'refresh';
+}
+
+export function signAccessToken(
+  payload: Omit<AccessTokenPayload, 'type'>,
+  secret: string,
+  expiresIn: string,
+): string {
+  return jwt.sign({ ...payload, type: 'access' }, secret, { expiresIn } as any);
+}
+
+export function signRefreshToken(
+  payload: Omit<RefreshTokenPayload, 'type'>,
+  secret: string,
+  expiresIn: string,
+): string {
+  return jwt.sign({ ...payload, type: 'refresh' }, secret, { expiresIn } as any);
+}
+
+export function verifyAccessToken(token: string, secret: string): AccessTokenPayload {
+  return jwt.verify(token, secret) as AccessTokenPayload;
+}
+
+export function verifyRefreshToken(token: string, secret: string): RefreshTokenPayload {
+  return jwt.verify(token, secret) as RefreshTokenPayload;
+}
+
+export function hashToken(raw: string): string {
+  return crypto.createHash('sha256').update(raw).digest('hex');
+}
+
+export function generateRawToken(): string {
+  return crypto.randomBytes(48).toString('hex');
+}

backend/src/common/helpers/mailer.helper.ts

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+import * as nodemailer from 'nodemailer';
+
+export interface MailOptions {
+  to: string;
+  subject: string;
+  html: string;
+}
+
+let transporter: nodemailer.Transporter | null = null;
+
+function getTransporter(): nodemailer.Transporter {
+  if (transporter) return transporter;
+
+  const host = process.env.SMTP_HOST;
+  if (!host) {
+    // Console fallback for development
+    transporter = nodemailer.createTransport({ jsonTransport: true });
+    return transporter;
+  }
+
+  transporter = nodemailer.createTransport({
+    host,
+    port: parseInt(process.env.SMTP_PORT || '587', 10),
+    auth: {
+      user: process.env.SMTP_USER,
+      pass: process.env.SMTP_PASS,
+    },
+  });
+  return transporter;
+}
+
+export async function sendMail(options: MailOptions): Promise<void> {
+  const from = process.env.MAIL_FROM || 'no-reply@blog.local';
+  const t = getTransporter();
+
+  if (!process.env.SMTP_HOST) {
+    console.log('[MAIL CONSOLE FALLBACK]');
+    console.log(`  TO: ${options.to}`);
+    console.log(`  SUBJECT: ${options.subject}`);
+    console.log(`  BODY: ${options.html}`);
+    return;
+  }
+
+  await t.sendMail({ from, ...options });
+}

backend/src/common/helpers/slug.helper.ts

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+import { v4 as uuidv4 } from 'uuid';
+
+export function generateSlug(title: string): string {
+  const base = title
+    .toLowerCase()
+    .trim()
+    .replace(/[^\w\s-]/g, '')
+    .replace(/\s+/g, '-')
+    .replace(/-+/g, '-')
+    .substring(0, 200);
+
+  const suffix = uuidv4().split('-')[0]; // 8-char UUID segment
+  return `${base}-${suffix}`;
+}