Initial commit: WebDAV-Adapter für Internxt Drive

- Browser-Token-Auth (INXT_TOKEN, INXT_MNEMONIC)
- Phase 1: PROPFIND (Verzeichnis auflisten)
- Drive API + Pfad-Resolver
- Dokumentation: Auth, Architektur, WSL

Made-with: Cursor

src/internxt-client.js

@@ -0,0 +1,41 @@
+/**
+ * Internxt API Client – Drive API + User Refresh
+ * Nutzt Browser-Token (INXT_TOKEN) für drive-web Endpoints.
+ */
+
+import 'dotenv/config';
+import { Storage, Users } from '@internxt/sdk/dist/drive/index.js';
+
+const DRIVE_API_URL = process.env.DRIVE_API_URL || 'https://gateway.internxt.com/drive';
+
+const appDetails = { clientName: 'drive-web', clientVersion: '1.0' };
+
+/**
+ * Erstellt API-Clients mit aktuellem Token.
+ * @param {string} token - Bearer Token (xNewToken)
+ * @returns {{ users: Users, storage: Storage }}
+ */
+export function createClients(token) {
+  const apiSecurity = {
+    token,
+    unauthorizedCallback: () => {
+      throw new Error('Token abgelaufen oder ungültig');
+    },
+  };
+  return {
+    users: Users.client(DRIVE_API_URL, appDetails, apiSecurity),
+    storage: Storage.client(DRIVE_API_URL, appDetails, apiSecurity),
+  };
+}
+
+/**
+ * Holt User-Daten inkl. Bridge-Credentials via refreshUser.
+ * @param {string} token
+ * @returns {Promise<{ user: object, newToken?: string }>}
+ */
+export async function refreshUser(token) {
+  const { users } = createClients(token);
+  const response = await users.refreshUser();
+  const user = response?.user ?? response;
+  return { user, newToken: response?.newToken };
+}