✨ feat: add support for ZITADEL SSO provider

docs/self-hosting/advanced/authentication.mdx

@@ -7,7 +7,8 @@ Currently supported identity verification services include:
 - [Auth0](/en/self-hosting/advanced/sso-providers/auth0)
 - [Microsoft Entra ID](/en/self-hosting/advanced/sso-providers/microsoft-entra-id)
 - [Authentik](/en/self-hosting/advanced/sso-providers/authentik)
-- [Github](/en/self-hosting/advanced/sso-providers/github
+- [Github](/en/self-hosting/advanced/sso-providers/github)
+- [ZITADEL](/en/self-hosting/advanced/sso-providers/zitadel)
 
 Click on the links to view the corresponding platform's configuration documentation.
 
@@ -23,6 +24,7 @@ The order corresponds to the display order of the SSO providers.
 | Microsoft Entra ID | `azure-ad` |
 | Authentik          | `authentik` |
 | Github             |  `github`  |
+| ZITADEL            | `zitadel`  |
 
 ## Other SSO Providers
 

docs/self-hosting/advanced/authentication.zh-CN.mdx

@@ -8,6 +8,7 @@ LobeChat 支持配置外部身份验证服务，供企业 / 组织内部使用
 - [Microsoft Entra ID](/zh/self-hosting/advanced/sso-providers/microsoft-entra-id)
 - [Authentik](/zh/self-hosting/advanced/sso-providers/authentik)
 - [Github](/zh/self-hosting/advanced/sso-providers/github)
+- [ZITADEL](/zh/self-hosting/advanced/sso-providers/zitadel)
 
 点击链接可以查看对应平台的配置文档。
 
@@ -23,6 +24,7 @@ LobeChat 支持配置外部身份验证服务，供企业 / 组织内部使用
 | Microsoft Entra ID | `azure-ad` |
 | Authentik          | `authentik` |
 | Github             |  `github`  |
+| ZITADEL            | `zitadel`  |
 
 ## 其他 SSO 提供商
 

docs/self-hosting/advanced/sso-providers/zitadel.mdx

@@ -0,0 +1,65 @@
+# Configure ZITADEL Authentication Service
+
+<Steps>
+  ### Create ZITADEL Application
+
+  Log in to the console of your ZITADEL instance using an account with at least a [`Project Owner` role](https://zitadel.com/docs/guides/manage/console/managers#roles), navigate to (or [create](https://zitadel.com/docs/guides/manage/console/projects#create-a-project)) the project you'd like to host your application in, and click the **New** button to create an application.
+
+  <Image alt="Create ZITADEL Application S1" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/b05473ad-04a6-4ebc-9810-116c778d4448" />
+
+  Fill in the name, choose **Web** as the application type, and click **Continue**.
+
+  <Image alt="Create ZITADEL Application S2" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/5a0e6c58-9e6f-4ffb-8af2-32e48cfb45b0" />
+
+  Choose **Code** as the authentication method.
+
+  <Image alt="Create ZITADEL Application S3" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/14ecaa12-74a1-4e2f-b171-9d9ac09d3d63" />
+
+  In the **Redirect URIs** field, fill in:
+
+  ```
+  http(s)://your-domain/api/auth/callback/zitadel
+  ```
+
+  <Image alt="Create ZITADEL Application S4" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/4ff3c3a0-9ca0-45ff-8f3a-219f4445098b" />
+
+  <Callout type={'important'}>
+    - You can fill in or modify redirect URIs after creating the application, but make sure the filled URL is consistent with the deployed URL.
+    - Replace `http(s)://your-domain` with the actual URL that LobeChat is deployed to.
+  </Callout>
+
+  Confirm the configuration and click **Create**.
+
+  <Image alt="Create ZITADEL Application S5" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/bee24764-aa42-47d9-ad43-bcb8e7b35bc3" />
+
+  Save the **ClientId** and **ClientSecret** for later use.
+
+  <Image alt="Create ZITADEL Application S6" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/407b4eed-7f21-4aa6-b68f-9bae2faf09d0" />
+
+  In the application settings page, navigate to the **URLs** tab, and save the **issuer** URL.
+
+  <Image alt="Create ZITADEL Application S7" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/d12a2661-7b98-484f-8f3d-07e84d42ae08" />
+
+  ### Configure Environment Variables
+
+  When deploying LobeChat, you need to configure the following environment variables:
+
+  | Environment Variable    | Type     | Description                                                                                                                                                                                         |
+  | ----------------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+  | `ENABLE_OAUTH_SSO`      | Required | Enable single sign-on (SSO) for LobeChat. Set to `1` to enable single sign-on.                                                                                                                      |
+  | `NEXTAUTH_SECRET`       | Required | Key used to encrypt Auth.js session tokens. You can generate a key using the following command: `openssl rand -base64 32`                                                                           |
+  | `SSO_PROVIDERS`         | Optional | Select the single sign-on provider for LoboChat. Use `zitadel` for ZITADEL.                                                                                                                         |
+  | `ZITADEL_CLIENT_ID`     | Required | Client ID (`ClientId` as shown in ZITADEL) of the ZITADEL application                                                                                                                               |
+  | `ZITADEL_CLIENT_SECRET` | Required | Client Secret (`ClientSecret` as shown in ZITADEL) of the ZITADEL application                                                                                                                       |
+  | `ZITADEL_ISSUER`        | Required | Issuer URL of the ZITADEL application                                                                                                                                                               |
+  | `ACCESS_CODE`           | Required | Add a password to access this service. You can set a sufficiently long random password to "disable" access code authorization.                                                                      |
+  | `NEXTAUTH_URL`          | Optional | The URL is used to specify the callback address for the execution of OAuth authentication in Auth.js. It needs to be set only when the default address is incorrect. `https://example.com/api/auth` |
+
+  <Callout type={'tip'}>
+    You can refer to the related variable details at [📘Environment Variables](/en/self-hosting/environment-variables/auth#zitadel).
+  </Callout>
+</Steps>
+
+<Callout>
+  After successful deployment, users will be able to authenticate and use LobeChat using existing users configured in ZITADEL.
+</Callout>

docs/self-hosting/advanced/sso-providers/zitadel.zh-CN.mdx

@@ -0,0 +1,65 @@
+# 配置 ZITADEL 身份验证服务
+
+<Steps>
+  ### 创建 ZITADEL 应用
+
+  使用具有 [`Project Owner` 角色](https://zitadel.com/docs/guides/manage/console/managers#roles)的账户登录到 ZITADEL 实例控制台，进入（或[创建](https://zitadel.com/docs/guides/manage/console/projects#create-a-project)）该应用所属的项目，点击「创建」按钮创建应用。
+
+  <Image alt="创建 ZITADEL 应用 1" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/3564110d-bef9-47f3-b775-e5f28b4275b2" />
+
+  填写应用名称，应用类型选择「Web」，点击「继续」。
+
+  <Image alt="创建 ZITADEL 应用 2" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/12451b47-8dcd-40a9-b18d-2806b07efecc" />
+
+  选择「Code」作为身份验证方式。
+
+  <Image alt="创建 ZITADEL 应用 3" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/9d5cb651-ad10-47c7-8c8b-2256163c5521" />
+
+  在「重定向 URLs」字段中填写：
+
+  ```
+  http(s)://your-domain/api/auth/callback/zitadel
+  ```
+
+  <Image alt="创建 ZITADEL 应用 4" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/1699bf46-0c8d-4238-9eb5-34282bfe529a" />
+
+  <Callout type={'important'}>
+    - 可以创建应用后再填写或修改重定向 URL，但请确保填写的 URL 与部署的 URL 一致。
+    - 请将 `http(s)://your-domain` 替换为 LobeChat 部署的实际 URL。
+  </Callout>
+
+  确认配置并点击「创建」。
+
+  <Image alt="创建 ZITADEL 应用 5" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/375b3d73-6796-465c-9063-f2762093f763" />
+
+  记录下「ClientId」和「ClientSecret」备用。
+
+  <Image alt="创建 ZITADEL 应用 6" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/40bb6b4c-18e0-4ae5-abae-ae0cf202cf08" />
+
+  在应用设置页面中，切换到「URLs」选项卡，记录下「issuer」URL。
+
+  <Image alt="创建 ZITADEL 应用 7" inStep src="https://github.com/lobehub/lobe-chat/assets/8692892/79c55d44-8dcb-429c-a072-d3eb014bbceb" />
+
+  ### 配置环境变量
+
+  部署 LobeChat 时，您需要配置以下环境变量：
+
+  | 环境变量               | 类型      | 描述                                                                                                                                                                                                |
+  | ----------------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+  | `ENABLE_OAUTH_SSO`      | 必选    | 为 LobeChat 启用单点登录（SSO）。设置为 `1` 以启用单点登录。                                                                                                                                       |
+  | `NEXTAUTH_SECRET`       | 必选 | 用于加密 Auth.js 会话令牌的密钥。您可以使用以下命令生成密钥：`openssl rand -base64 32`                                                                                                             |
+  | `SSO_PROVIDERS`         | 可选     | 为 LobeChat 选择单点登录提供程序。对于 ZITADEL，请填写 `zitadel`。                                                                                                                                 |
+  | `ZITADEL_CLIENT_ID`     | 必选   | ZITADEL 应用的 Client ID（`ClientId`）。                                                                                                                                                   |
+  | `ZITADEL_CLIENT_SECRET` | 必选   | ZITADEL 应用的 Client Secret（`ClientSecret`）。                                                                                                                                           |
+  | `ZITADEL_ISSUER`        | 必选   | ZITADEL 应用的 OpenID Connect 颁发者（issuer）URL。                                                                                                                                            |
+  | `ACCESS_CODE`           | 必选   | 添加访问此服务的代码。您可以设置一个足够长的随机密码以「禁用」访问码授权。                                                                                                              |
+  | `NEXTAUTH_URL`          | 可选     | 该 URL 用于指定 Auth.js 中执行 OAuth 认证的回调地址。仅当默认地址不正确时才需要设置。`https://example.com/api/auth`                                                                          |
+
+  <Callout type={'tip'}>
+    您可以在 [📘 环境变量](/zh/self-hosting/environment-variables/auth#zitadel) 中查看相关变量的详细信息。
+  </Callout>
+</Steps>
+
+<Callout>
+  部署成功后，用户将能够通过 ZITADEL 中配置的用户进行身份验证并使用 LobeChat。
+</Callout>

docs/self-hosting/environment-variables/auth.mdx

@@ -117,6 +117,29 @@ LobeChat provides a complete authentication service capability when deployed. Th
 - Default: `-`
 - Example: `dd262976ac0931d947e104891586a053f3d3750b`
 
+## ZITADEL
+
+### `ZITADEL_CLIENT_ID`
+
+- Type: Required
+- Description: Client ID of the ZITADEL application. This can be found under your application in the ZITADEL console.
+- Default: `-`
+- Example: `123456789012345678@your-project`
+
+### `ZITADEL_CLIENT_SECRET`
+
+- Type: Required
+- Description: Client Secret of the ZITADEL application.
+- Default: `-`
+- Example: `9QF1n5ATzU7Z3mHp2Iw4gKX8kY6oR7uW1DnKcV3LqX2jF6iG3fBmJ1kV7nS5zE6A`
+
+### `ZITADEL_ISSUER`
+
+- Type: Required
+- Description: Issuer of the ZITADEL application. This is usually the URL of the ZITADEL instance, and can be found in `URLs` tab of your application in the console.
+- Default: `-`
+- Example: `https://your-instance-abc123.zitadel.cloud`
+
 <Callout>
   Currently, we only support providers above. If you need to use other identity verification service
   providers, you can submit a [feature

docs/self-hosting/environment-variables/auth.zh-CN.mdx

@@ -118,6 +118,29 @@ LobeChat 在部署时提供了完善的身份验证服务能力，以下是相
 - Default: `-`
 - Example: `dd262976ac0931d947e104891586a053f3d3750b`
 
+## ZITADEL
+
+### `ZITADEL_CLIENT_ID`
+
+- 类型：必选
+- 描述：ZITADEL 应用的 Client ID。您可以在 ZITADEL 控制台应用设置中找到 Client ID。
+- 默认值：`-`
+- 示例：`123456789012345678@your-project`
+
+### `ZITADEL_CLIENT_SECRET`
+
+- 类型：必选
+- 描述：ZITADEL 应用的 Client Secret。
+- 默认值：`-`
+- 示例：`9QF1n5ATzU7Z3mHp2Iw4gKX8kY6oR7uW1DnKcV3LqX2jF6iG3fBmJ1kV7nS5zE6A`
+
+### `ZITADEL_ISSUER`
+
+- 类型：必选
+- 描述：ZITADEL 应用的 OpenID Connect 颁发者（issuer），通常为 ZITADEL 实例的 URL。您可以在 ZITADEL 控制台应用设置中的 `URLs` 选项卡中找到 issuer。
+- 默认值：`-`
+- 示例：`https://your-instance-abc123.zitadel.cloud`
+
 <Callout>
   如果您需要使用其他身份验证服务提供商，可以提交
   [功能请求](https://github.com/lobehub/lobe-chat/issues/new/choose) 或 Pull Request。

src/app/api/auth/sso-providers/index.ts

@@ -2,5 +2,6 @@ import Auth0 from './auth0';
 import Authentik from './authentik';
 import AzureAD from './azure-ad';
 import Github from './github';
+import Zitadel from './zitadel';
 
-export const ssoProviders = [Auth0, Authentik, AzureAD, Github];
+export const ssoProviders = [Auth0, Authentik, AzureAD, Github, Zitadel];

src/app/api/auth/sso-providers/zitadel.ts

@@ -0,0 +1,18 @@
+import Zitadel from 'next-auth/providers/zitadel';
+
+import { getServerConfig } from '@/config/server';
+
+const { ZITADEL_CLIENT_ID, ZITADEL_CLIENT_SECRET, ZITADEL_ISSUER } = getServerConfig();
+
+const provider = {
+  id: 'zitadel',
+  provider: Zitadel({
+    // Available scopes in ZITADEL: https://zitadel.com/docs/apis/openidoauth/scopes
+    authorization: { params: { scope: 'openid email profile' } },
+    clientId: ZITADEL_CLIENT_ID,
+    clientSecret: ZITADEL_CLIENT_SECRET,
+    issuer: ZITADEL_ISSUER,
+  }),
+};
+
+export default provider;

src/config/server/app.ts

@@ -70,6 +70,9 @@ export const getAppConfig = () => {
     AUTHENTIK_CLIENT_ID: process.env.AUTHENTIK_CLIENT_ID || '',
     AUTHENTIK_CLIENT_SECRET: process.env.AUTHENTIK_CLIENT_SECRET || '',
     AUTHENTIK_ISSUER: process.env.AUTHENTIK_ISSUER || '',
+    ZITADEL_CLIENT_ID: process.env.ZITADEL_CLIENT_ID || '',
+    ZITADEL_CLIENT_SECRET: process.env.ZITADEL_CLIENT_SECRET || '',
+    ZITADEL_ISSUER: process.env.ZITADEL_ISSUER || '',
     NEXTAUTH_SECRET: process.env.NEXTAUTH_SECRET || '',
 
     ENABLE_LANGFUSE: process.env.ENABLE_LANGFUSE === '1',