# SSO Module

Single Sign-On (SSO) support for authenticating Base44 users with external systems. Available via `base44.asServiceRole.sso`.

> **Backend only**: This module requires service role access and can only be used in Base44-hosted backend functions.

## Methods

| Method | Signature | Description |
|--------|-----------|-------------|
| `getAccessToken(userId)` | `Promise<SsoAccessTokenResponse>` | Get an SSO access token for a specific user |

## Examples

### Get SSO Access Token

```javascript
import { createClientFromRequest } from "npm:@base44/sdk";

Deno.serve(async (req) => {
  const base44 = createClientFromRequest(req);

  // Get the current user
  const user = await base44.auth.me();
  if (!user) {
    return Response.json({ error: "Unauthorized" }, { status: 401 });
  }

  // Get SSO access token for this user
  const { access_token } = await base44.asServiceRole.sso.getAccessToken(user.id);

  // Use the token to authenticate with an external system
  return Response.json({ ssoToken: access_token });
});
```

### Get Token for a Specific User (Service Role)

```javascript
Deno.serve(async (req) => {
  const base44 = createClientFromRequest(req);
  const { userId } = await req.json();

  // Get SSO token for any user (service role has access to all users)
  const { access_token } = await base44.asServiceRole.sso.getAccessToken(userId);

  return Response.json({ token: access_token });
});
```

## Use Cases

- Authenticating Base44 users with external SaaS tools (e.g., Okta, Azure AD)
- Building SSO bridges between Base44 and third-party systems
- Generating tokens for backend-to-backend authenticated calls

## Type Definitions

```typescript
/** Response from the SSO access token endpoint. */
interface SsoAccessTokenResponse {
  /** The SSO access token for the specified user. */
  access_token: string;
}

/** SSO module for managing SSO authentication (service role only). */
interface SsoModule {
  /**
   * Gets an SSO access token for a specific user.
   * @param userid - The Base44 user ID to get the SSO token for.
   * @returns Promise resolving to the SSO access token response.
   */
  getAccessToken(userid: string): Promise<SsoAccessTokenResponse>;
}
```