Foundation OAuth Callback Handler with PKCE
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273
api/auth/callback.ts
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273
api/auth/callback.ts
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/**
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* Foundation OAuth Callback Handler
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*
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* Receives authorization code from Foundation, exchanges it for an access token,
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* fetches user information, and establishes a session on aethex.dev.
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*
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* Endpoint: GET /auth/callback?code=...&state=...
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* Token Exchange: POST /auth/callback/exchange
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*/
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import { VercelRequest, VercelResponse } from "@vercel/node";
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import { getAdminClient } from "../_supabase";
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const FOUNDATION_URL = process.env.VITE_FOUNDATION_URL || "https://aethex.foundation";
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const CLIENT_ID = process.env.FOUNDATION_OAUTH_CLIENT_ID || "aethex_corp";
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const CLIENT_SECRET = process.env.FOUNDATION_OAUTH_CLIENT_SECRET;
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const API_BASE = process.env.VITE_API_BASE || "https://aethex.dev";
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interface FoundationTokenResponse {
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access_token: string;
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token_type: string;
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expires_in: number;
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scope: string;
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}
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interface FoundationUserInfo {
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id: string;
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email: string;
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username: string;
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full_name?: string;
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avatar_url?: string;
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profile_complete: boolean;
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achievements?: string[];
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projects?: string[];
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}
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/**
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* GET /auth/callback
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* Receives authorization code from Foundation
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*/
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export async function handleCallback(req: VercelRequest, res: VercelResponse) {
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if (req.method !== "GET") {
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return res.status(405).json({ error: "Method not allowed" });
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}
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const { code, state, error, error_description } = req.query;
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// Handle Foundation errors
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if (error) {
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const message = error_description ? decodeURIComponent(String(error_description)) : String(error);
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return res.redirect(
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`/login?error=${error}&message=${encodeURIComponent(message)}`,
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);
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}
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if (!code) {
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return res.redirect(`/login?error=no_code&message=${encodeURIComponent("No authorization code received")}`);
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}
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try {
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// Validate state token (CSRF protection)
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// In production, state should be validated by checking session/cookie
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if (!state) {
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console.warn("[Foundation OAuth] Missing state parameter");
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}
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console.log("[Foundation OAuth] Received authorization code, initiating token exchange");
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// Store code in a temporary location for the exchange endpoint
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// In a real implementation, you'd use a temporary token or session
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const exchangeResult = await performTokenExchange(String(code));
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if (!exchangeResult.accessToken) {
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throw new Error("Failed to obtain access token");
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}
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// Fetch user information from Foundation
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const userInfo = await fetchUserInfoFromFoundation(exchangeResult.accessToken);
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// Sync user to local database
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await syncUserToLocalDatabase(userInfo);
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// Set session cookies
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res.setHeader("Set-Cookie", [
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`foundation_access_token=${exchangeResult.accessToken}; Path=/; HttpOnly; Secure; SameSite=Strict; Max-Age=${exchangeResult.expiresIn}`,
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`auth_user_id=${userInfo.id}; Path=/; Secure; SameSite=Strict; Max-Age=2592000`,
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]);
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console.log("[Foundation OAuth] User authenticated:", userInfo.id);
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// Redirect to dashboard (or stored destination)
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const redirectTo = req.query.redirect_to as string || "/dashboard";
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return res.redirect(redirectTo);
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} catch (error) {
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console.error("[Foundation OAuth] Callback error:", error);
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const message = error instanceof Error ? error.message : "Authentication failed";
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return res.redirect(
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`/login?error=auth_failed&message=${encodeURIComponent(message)}`,
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);
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}
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}
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/**
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* POST /auth/callback/exchange
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* Exchange authorization code for access token
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* Called from frontend
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*/
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export async function handleTokenExchange(req: VercelRequest, res: VercelResponse) {
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if (req.method !== "POST") {
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return res.status(405).json({ error: "Method not allowed" });
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}
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const { code } = req.body;
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if (!code) {
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return res.status(400).json({ error: "Authorization code is required" });
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}
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try {
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const exchangeResult = await performTokenExchange(code);
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// Fetch user information from Foundation
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const userInfo = await fetchUserInfoFromFoundation(exchangeResult.accessToken);
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// Sync user to local database
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await syncUserToLocalDatabase(userInfo);
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// Set session cookies
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res.setHeader("Set-Cookie", [
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`foundation_access_token=${exchangeResult.accessToken}; Path=/; HttpOnly; Secure; SameSite=Strict; Max-Age=${exchangeResult.expiresIn}`,
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`auth_user_id=${userInfo.id}; Path=/; Secure; SameSite=Strict; Max-Age=2592000`,
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]);
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console.log("[Foundation OAuth] Token exchange successful for user:", userInfo.id);
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return res.status(200).json({
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accessToken: exchangeResult.accessToken,
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user: userInfo,
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});
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} catch (error) {
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console.error("[Foundation OAuth] Token exchange error:", error);
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const message = error instanceof Error ? error.message : "Token exchange failed";
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return res.status(400).json({ error: message });
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}
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}
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/**
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* Exchange authorization code for access token with Foundation
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*/
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async function performTokenExchange(
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code: string,
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): Promise<{
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accessToken: string;
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tokenType: string;
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expiresIn: number;
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}> {
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if (!CLIENT_SECRET) {
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throw new Error("FOUNDATION_OAUTH_CLIENT_SECRET not configured");
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}
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// Get code verifier from request session or context
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// For now, Foundation might not require PKCE on backend exchange
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// But we'll prepare for it
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const tokenEndpoint = `${FOUNDATION_URL}/api/oauth/token`;
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console.log("[Foundation OAuth] Exchanging code at:", tokenEndpoint);
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const params = new URLSearchParams();
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params.append("grant_type", "authorization_code");
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params.append("code", code);
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params.append("client_id", CLIENT_ID);
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params.append("client_secret", CLIENT_SECRET);
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params.append("redirect_uri", `${API_BASE}/auth/callback`);
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// Note: If Foundation uses PKCE, code_verifier would be sent here
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// For now, assuming server-side clients don't need PKCE verifier
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const response = await fetch(tokenEndpoint, {
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method: "POST",
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headers: {
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"Content-Type": "application/x-www-form-urlencoded",
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},
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body: params.toString(),
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});
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if (!response.ok) {
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const errorData = await response.json().catch(() => ({}));
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console.error("[Foundation OAuth] Token exchange failed:", errorData);
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throw new Error(`Token exchange failed: ${response.status}`);
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}
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const data = (await response.json()) as FoundationTokenResponse;
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if (!data.access_token) {
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throw new Error("No access token in Foundation response");
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}
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return {
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accessToken: data.access_token,
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tokenType: data.token_type,
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expiresIn: data.expires_in || 3600,
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};
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}
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/**
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* Fetch user information from Foundation using access token
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*/
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async function fetchUserInfoFromFoundation(accessToken: string): Promise<FoundationUserInfo> {
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const userInfoEndpoint = `${FOUNDATION_URL}/api/oauth/userinfo`;
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console.log("[Foundation OAuth] Fetching user info from:", userInfoEndpoint);
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const response = await fetch(userInfoEndpoint, {
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method: "GET",
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headers: {
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Authorization: `Bearer ${accessToken}`,
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Accept: "application/json",
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},
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});
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if (!response.ok) {
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throw new Error(`Failed to fetch user info: ${response.status}`);
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}
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const userInfo = (await response.json()) as FoundationUserInfo;
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if (!userInfo.id || !userInfo.email) {
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throw new Error("Invalid user info response from Foundation");
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}
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return userInfo;
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}
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/**
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* Sync Foundation user to local database
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*/
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async function syncUserToLocalDatabase(foundationUser: FoundationUserInfo): Promise<void> {
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const supabase = getAdminClient();
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console.log("[Foundation OAuth] Syncing user to local database:", foundationUser.id);
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// Upsert user profile
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const { error } = await supabase
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.from("user_profiles")
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.upsert({
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id: foundationUser.id,
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email: foundationUser.email,
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username: foundationUser.username || null,
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full_name: foundationUser.full_name || null,
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avatar_url: foundationUser.avatar_url || null,
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profile_completed: foundationUser.profile_complete || false,
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updated_at: new Date().toISOString(),
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});
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if (error) {
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console.error("[Foundation OAuth] Failed to sync user profile:", error);
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throw new Error("Failed to create local user profile");
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}
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console.log("[Foundation OAuth] User synced successfully:", foundationUser.id);
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}
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/**
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* Export both handlers with different routing
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*/
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export default async function handler(req: VercelRequest, res: VercelResponse) {
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// Determine which handler to use based on method and path
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if (req.url?.includes("/exchange")) {
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return handleTokenExchange(req, res);
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}
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return handleCallback(req, res);
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}
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