thunderbird2docuware/lib/auth.js

// DocuWare-Authentifizierung.
//
// Primär: DocuWare Identity Service (OpenID Connect).
//   Neuere DocuWare-Versionen / DocuWare Cloud haben das alte Cookie-Logon
//   (/Account/Logon) abgeschaltet (HTTP 410) und verlangen ein OAuth-Token.
//   Wir nutzen den Resource-Owner-Password-Grant (ROPC) mit dem von DocuWare
//   vorinstallierten ÖFFENTLICHEN Client "docuware.platform.net.client" --
//   d.h. KEINE eigene App-Registrierung und KEIN Client-Secret nötig.
//
//   Ablauf:
//     1. GET  {platform}/Home/IdentityServiceInfo        -> Identity-Service-URL
//     2. GET  {identity}/.well-known/openid-configuration -> token_endpoint
//     3. POST {token_endpoint}  grant_type=password ...   -> access_token
//     4. Folgeaufrufe der Platform-API mit  Authorization: Bearer <token>
//
// Fallback: Findet sich kein Identity Service (alte On-Prem-Server), wird das
//   klassische Cookie-Logon versucht.
//
// Token wird im Speicher gehalten (TOKEN) und von authHeaders() ausgegeben.

const DW_PUBLIC_CLIENT_ID = "docuware.platform.net.client";
const DW_SCOPE = "docuware.platform";

let TOKEN = null; // { accessToken, refreshToken, expiresAt, tokenEndpoint }

const Auth = {
  /**
   * Meldet sich an DocuWare an. Wirft bei Fehlschlag.
   * @returns {Promise<{mode:string}>}
   */
  async logon(settings) {
    const identityUrl = await this._discoverIdentityService(settings);
    if (identityUrl) {
      await this._logonIdentity(settings, identityUrl);
      return { mode: "identity" };
    }
    // Fallback: altes Cookie-Logon (nur ältere On-Prem-Server).
    await this._logonCookie(settings);
    return { mode: "cookie" };
  },

  /** Zusätzliche Header für Requests. Bearer-Token, falls vorhanden. */
  authHeaders() {
    if (TOKEN && TOKEN.accessToken) {
      return { Authorization: `Bearer ${TOKEN.accessToken}` };
    }
    return {};
  },

  /** Aktuell ein Token vorhanden und (noch) gültig? */
  hasValidToken() {
    return !!(TOKEN && TOKEN.accessToken && TOKEN.expiresAt > Date.now() + 5000);
  },

  /** Token verwerfen (z.B. beim Wechsel der Zugangsdaten). */
  reset() {
    TOKEN = null;
  },

  // --- Identity Service -----------------------------------------------------

  /**
   * Ermittelt die Identity-Service-URL. Liefert null, wenn der Server keinen
   * Identity Service meldet (dann Cookie-Fallback).
   */
  async _discoverIdentityService(settings) {
    const platform = Settings.platformUrl(settings);
    let res;
    try {
      res = await fetch(`${platform}/Home/IdentityServiceInfo`, {
        method: "GET",
        headers: { Accept: "application/json" },
      });
    } catch (_) {
      return null;
    }
    if (!res.ok) return null;
    const info = await res.json().catch(() => ({}));
    const url =
      info.IdentityServiceUrl ||
      info.identityServiceUrl ||
      info.Url ||
      info.url ||
      null;
    return url ? url.replace(/\/+$/, "") : null;
  },

  async _logonIdentity(settings, identityUrl) {
    // OpenID-Discovery -> token_endpoint.
    const discoRes = await fetch(`${identityUrl}/.well-known/openid-configuration`, {
      method: "GET",
      headers: { Accept: "application/json" },
    });
    if (!discoRes.ok) {
      throw new Error(
        `Identity Service nicht erreichbar (HTTP ${discoRes.status} bei ${identityUrl}).`
      );
    }
    const disco = await discoRes.json();
    const tokenEndpoint = disco.token_endpoint;
    if (!tokenEndpoint) throw new Error("token_endpoint im Identity Service nicht gefunden.");

    const body = new URLSearchParams({
      grant_type: "password",
      scope: DW_SCOPE,
      client_id: DW_PUBLIC_CLIENT_ID,
      username: settings.username,
      password: settings.password,
    });

    const res = await fetch(tokenEndpoint, {
      method: "POST",
      headers: {
        "Content-Type": "application/x-www-form-urlencoded",
        Accept: "application/json",
      },
      body: body.toString(),
    });

    const data = await res.json().catch(() => ({}));
    if (!res.ok || !data.access_token) {
      const detail =
        data.error_description || data.error || (await this._safeText(res));
      throw new Error(`Identity-Logon fehlgeschlagen (HTTP ${res.status}). ${detail || ""}`.trim());
    }

    TOKEN = {
      accessToken: data.access_token,
      refreshToken: data.refresh_token || null,
      expiresAt: Date.now() + (Number(data.expires_in) || 3600) * 1000,
      tokenEndpoint,
    };
  },

  // --- Cookie-Fallback (alte Server) ----------------------------------------

  async _logonCookie(settings) {
    const platform = Settings.platformUrl(settings);
    const body = new URLSearchParams({
      UserName: settings.username,
      Password: settings.password,
      Organization: settings.organization,
      RedirectToMyselfInCaseOfError: "false",
      RememberMe: "false",
    });
    const res = await fetch(`${platform}/Account/Logon`, {
      method: "POST",
      credentials: "include",
      headers: {
        "Content-Type": "application/x-www-form-urlencoded",
        Accept: "application/json",
      },
      body: body.toString(),
    });
    if (!res.ok) {
      const text = await this._safeText(res);
      throw new Error(`Logon fehlgeschlagen (HTTP ${res.status}). ${text}`.trim());
    }
  },

  async _safeText(res) {
    return res.text().catch(() => "");
  },
};

if (typeof module !== "undefined") module.exports = { Auth };