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import { createHash, randomBytes } from "node:crypto";
import * as argon2 from "argon2";
import { Hono } from "hono";
import { sign } from "hono/jwt";
import { Errors } from "../middleware/index.js";
import {
type RefreshTokenRepository,
refreshTokenRepository,
type UserRepository,
userRepository,
} from "../repositories/index.js";
import {
createUserSchema,
loginSchema,
refreshTokenSchema,
} from "../schemas/index.js";
const JWT_SECRET = process.env.JWT_SECRET;
if (!JWT_SECRET) {
throw new Error("JWT_SECRET environment variable is required");
}
const ACCESS_TOKEN_EXPIRES_IN = 60 * 15; // 15 minutes
const REFRESH_TOKEN_EXPIRES_IN = 60 * 60 * 24 * 7; // 7 days
function generateRefreshToken(): string {
return randomBytes(32).toString("hex");
}
function hashToken(token: string): string {
return createHash("sha256").update(token).digest("hex");
}
export interface AuthDependencies {
userRepo: UserRepository;
refreshTokenRepo: RefreshTokenRepository;
}
export function createAuthRouter(deps: AuthDependencies) {
const { userRepo, refreshTokenRepo } = deps;
const auth = new Hono();
auth.post("/register", async (c) => {
const body = await c.req.json();
const parsed = createUserSchema.safeParse(body);
if (!parsed.success) {
throw Errors.validationError(parsed.error.issues[0]?.message);
}
const { username, password } = parsed.data;
// Check if username already exists
const exists = await userRepo.existsByUsername(username);
if (exists) {
throw Errors.conflict("Username already exists", "USERNAME_EXISTS");
}
// Hash password with Argon2
const passwordHash = await argon2.hash(password);
// Create user
const newUser = await userRepo.create({ username, passwordHash });
return c.json({ user: newUser }, 201);
});
auth.post("/login", async (c) => {
const body = await c.req.json();
const parsed = loginSchema.safeParse(body);
if (!parsed.success) {
throw Errors.validationError(parsed.error.issues[0]?.message);
}
const { username, password } = parsed.data;
// Find user by username
const user = await userRepo.findByUsername(username);
if (!user) {
throw Errors.unauthorized(
"Invalid username or password",
"INVALID_CREDENTIALS",
);
}
// Verify password
const isPasswordValid = await argon2.verify(user.passwordHash, password);
if (!isPasswordValid) {
throw Errors.unauthorized(
"Invalid username or password",
"INVALID_CREDENTIALS",
);
}
// Generate JWT access token
const now = Math.floor(Date.now() / 1000);
const accessToken = await sign(
{
sub: user.id,
iat: now,
exp: now + ACCESS_TOKEN_EXPIRES_IN,
},
JWT_SECRET,
);
// Generate refresh token
const refreshToken = generateRefreshToken();
const tokenHash = hashToken(refreshToken);
const expiresAt = new Date(Date.now() + REFRESH_TOKEN_EXPIRES_IN * 1000);
// Store refresh token in database
await refreshTokenRepo.create({
userId: user.id,
tokenHash,
expiresAt,
});
return c.json({
accessToken,
refreshToken,
user: {
id: user.id,
username: user.username,
},
});
});
auth.post("/refresh", async (c) => {
const body = await c.req.json();
const parsed = refreshTokenSchema.safeParse(body);
if (!parsed.success) {
throw Errors.validationError(parsed.error.issues[0]?.message);
}
const { refreshToken } = parsed.data;
const tokenHash = hashToken(refreshToken);
// Find valid refresh token
const storedToken = await refreshTokenRepo.findValidToken(tokenHash);
if (!storedToken) {
throw Errors.unauthorized(
"Invalid or expired refresh token",
"INVALID_REFRESH_TOKEN",
);
}
// Get user info
const user = await userRepo.findById(storedToken.userId);
if (!user) {
throw Errors.unauthorized("User not found", "USER_NOT_FOUND");
}
// Delete old refresh token (rotation)
await refreshTokenRepo.deleteById(storedToken.id);
// Generate new access token
const now = Math.floor(Date.now() / 1000);
const accessToken = await sign(
{
sub: user.id,
iat: now,
exp: now + ACCESS_TOKEN_EXPIRES_IN,
},
JWT_SECRET,
);
// Generate new refresh token (rotation)
const newRefreshToken = generateRefreshToken();
const newTokenHash = hashToken(newRefreshToken);
const expiresAt = new Date(Date.now() + REFRESH_TOKEN_EXPIRES_IN * 1000);
await refreshTokenRepo.create({
userId: user.id,
tokenHash: newTokenHash,
expiresAt,
});
return c.json({
accessToken,
refreshToken: newRefreshToken,
user: {
id: user.id,
username: user.username,
},
});
});
return auth;
}
// Default auth router with real repositories for production use
export const auth = createAuthRouter({
userRepo: userRepository,
refreshTokenRepo: refreshTokenRepository,
});
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