Add OIDC authentification in project

src/app/api/auth/oidc/callback/route.ts

@@ -0,0 +1,79 @@
+import { NextRequest } from 'next/server';
+import {
+  getEffectiveOIDCConfig,
+  getOIDCUsernameFromIdToken,
+  exchangeCodeForToken,
+} from '@/lib/oidc';
+import { badRequest, unauthorized } from '@/lib/response';
+import { saveAuth } from '@/lib/auth';
+import { ROLES } from '@/lib/constants';
+import { getUserByUsername, createUser } from '@/queries';
+import { uuid, secret } from '@/lib/crypto';
+import { createSecureToken } from '@/lib/jwt';
+import redis from '@/lib/redis';
+
+export const runtime = 'nodejs';
+
+export async function GET(request: NextRequest) {
+  const cfg = await getEffectiveOIDCConfig();
+
+  if (!cfg.enabled) {
+    return badRequest('OIDC is not enabled');
+  }
+
+  const url = new URL(request.url);
+  const code = url.searchParams.get('code');
+  const state = url.searchParams.get('state');
+
+  if (!code || !state) {
+    return badRequest('Missing code or state parameter');
+  }
+
+  // Décoder les données du state
+  let stateData;
+  try {
+    const decoded = Buffer.from(state, 'base64url').toString('utf8');
+    stateData = JSON.parse(decoded);
+  } catch (e) {
+    return badRequest('Invalid state parameter format');
+  }
+
+  const { codeVerifier, returnUrl } = stateData;
+  const returnCookie = returnUrl || '/dashboard';
+
+  const tokens = await exchangeCodeForToken(cfg, code, codeVerifier);
+  const idToken = tokens.id_token;
+
+  if (!idToken) {
+    return unauthorized('Missing id_token');
+  }
+
+  const username = getOIDCUsernameFromIdToken(idToken, cfg.usernameClaim);
+
+  if (!username) {
+    return unauthorized('Unable to resolve username from id_token');
+  }
+
+  let user = await getUserByUsername(username);
+
+  if (!user && cfg.autoCreateUsers) {
+    user = await createUser({ id: uuid(), username, password: uuid(), role: ROLES.user });
+  }
+
+  if (!user) {
+    return unauthorized('User not allowed');
+  }
+
+  let token: string;
+  if (redis.enabled) {
+    token = await saveAuth({ userId: user.id, role: user.role });
+  } else {
+    token = createSecureToken({ userId: user.id, role: user.role }, secret());
+  }
+
+  const baseUrl = new URL(request.url).origin;
+  const ssoUrl = `${baseUrl}/sso?url=${encodeURIComponent(returnCookie)}&token=${encodeURIComponent(
+    token,
+  )}`;
+  return Response.redirect(ssoUrl, 302);
+}