root
95 lines
3.0 KiB
TypeScript
95 lines
3.0 KiB
TypeScript
import { createHmac, randomBytes, timingSafeEqual } from 'crypto';
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const GOOGLE_AUTH_URL = 'https://accounts.google.com/o/oauth2/v2/auth';
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const GOOGLE_TOKEN_URL = 'https://oauth2.googleapis.com/token';
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const GOOGLE_USERINFO_URL = 'https://www.googleapis.com/oauth2/v3/userinfo';
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export function isGoogleOAuthConfigured(): boolean {
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return Boolean(process.env.GOOGLE_CLIENT_ID && process.env.GOOGLE_CLIENT_SECRET);
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}
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export function getSiteOrigin(): string {
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return process.env.NEXT_PUBLIC_SITE_URL ?? 'http://localhost:3000';
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}
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export function getGoogleRedirectUri(): string {
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return `${getSiteOrigin()}/api/auth/callback/google`;
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}
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function getOAuthStateSecret(): string {
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return process.env.CUSTOMER_SESSION_SECRET ?? 'shahi-kitchen-customer-dev-secret';
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}
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export function createOAuthState(): string {
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const nonce = randomBytes(16).toString('hex');
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const signature = createHmac('sha256', getOAuthStateSecret()).update(nonce).digest('hex');
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return `${nonce}.${signature}`;
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}
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export function verifyOAuthState(state: string | null | undefined): boolean {
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if (!state) return false;
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const [nonce, signature] = state.split('.');
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if (!nonce || !signature) return false;
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const expected = createHmac('sha256', getOAuthStateSecret()).update(nonce).digest('hex');
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const sigBuffer = Buffer.from(signature);
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const expectedBuffer = Buffer.from(expected);
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if (sigBuffer.length !== expectedBuffer.length) return false;
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return timingSafeEqual(sigBuffer, expectedBuffer);
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}
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export function buildGoogleAuthUrl(state: string): string {
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const params = new URLSearchParams({
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client_id: process.env.GOOGLE_CLIENT_ID!,
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redirect_uri: getGoogleRedirectUri(),
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response_type: 'code',
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scope: 'openid email profile',
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access_type: 'online',
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prompt: 'select_account',
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state,
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});
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return `${GOOGLE_AUTH_URL}?${params.toString()}`;
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}
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interface GoogleTokenResponse {
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access_token?: string;
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error?: string;
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}
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interface GoogleUserInfo {
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email?: string;
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email_verified?: boolean;
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name?: string;
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}
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export async function fetchGoogleUserFromCode(
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code: string,
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): Promise<{ email: string; name?: string } | null> {
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const tokenResponse = await fetch(GOOGLE_TOKEN_URL, {
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method: 'POST',
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headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
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body: new URLSearchParams({
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code,
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client_id: process.env.GOOGLE_CLIENT_ID!,
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client_secret: process.env.GOOGLE_CLIENT_SECRET!,
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redirect_uri: getGoogleRedirectUri(),
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grant_type: 'authorization_code',
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}),
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});
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const tokenData = (await tokenResponse.json()) as GoogleTokenResponse;
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if (!tokenResponse.ok || !tokenData.access_token) return null;
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const userResponse = await fetch(GOOGLE_USERINFO_URL, {
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headers: { Authorization: `Bearer ${tokenData.access_token}` },
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});
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const userData = (await userResponse.json()) as GoogleUserInfo;
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if (!userResponse.ok || !userData.email || userData.email_verified === false) return null;
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return {
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email: userData.email,
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name: userData.name,
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};
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} |