webiny-configure-auth0

# Configure Auth0 Authentication

## TL;DR

Webiny supports Auth0 as an external identity provider (IDP) to replace the default Cognito authentication. First, install the `@webiny/auth0` package (using the same version as the `webiny` dependency in `package.json`). Then create two files: an API config class that maps Auth0 JWT claims to Webiny identity data (`Auth0IdpConfig`), and a React extension component (`<Auth0 />`) that wires issuer URL, client ID, and the API config path. Register the extension in `webiny.config.tsx`, set two environment variables (`AUTH0_ISSUER`, `AUTH0_CLIENT_ID`), and deploy.

## Pattern / Core Concept

Auth0 integration has two parts:

1. **API Config** — A class implementing `Auth0IdpConfig.Interface` that maps JWT token claims to Webiny's identity structure. Registered via `Auth0IdpConfig.createImplementation()` (the universal DI pattern).
2. **Extension Component** — A React component that renders `<Auth0 />` from `@webiny/auth0`, passing the issuer URL, client ID, and path to the API config file. The `<Auth0 />` component handles environment variable injection, API extension registration, and Admin login screen setup automatically.

### How `<Auth0 />` Works Internally

The `<Auth0 />` component (from `@webiny/auth0`) is a `defineExtension` that:

- Sets Lambda env vars: `AUTH0_ISSUER`, `AUTH0_CLIENT_ID`
- Sets Admin app env vars: `REACT_APP_IDP_TYPE=auth0`, `REACT_APP_AUTH0_ISSUER`, `REACT_APP_AUTH0_CLIENT_ID`
- Registers the internal `Auth0IdpFeature` API extension (OIDC token verification)
- Registers your custom API config extension (identity mapping)
- Registers the Admin Auth0 login screen extension

## Reference Tables

### `Auth0IdpConfig.Interface`

| Method              | Signature                                                        | Required | Description                                           |
| ------------------- | ---------------------------------------------------------------- | -------- | ----------------------------------------------------- |
| `getIdentity`       | `(token: JwtPayload) => Auth0Identity \| Promise<Auth0Identity>` | Yes      | Maps JWT claims to Webiny identity data               |
| `verifyTokenClaims` | `(token: JwtPayload) => void \| Promise<void>`                   | No       | Custom claim verification (throw to reject the token) |

### `Auth0Identity` (Return Type of `getIdentity`)

| Field         | Type                             | Description                                      |
| ------------- | -------------------------------- | ------------------------------------------------ |
| `id`          | `string`                         | Unique user ID (typically `token["sub"]`)        |
| `displayName` | `string`                         | User's display name                              |
| `roles`       | `string[]`                       | Webiny security roles to assign                  |
| `teams`       | `string[]`                       | Webiny teams (optional, filter out falsy values) |
| `profile`     | `{ firstName, lastName, email }` | User profile fields                              |
| `context`     | `object`                         | Runtime data (not stored in DB)                  |

### `<Auth0 />` Component Props

| Prop        | Type     | Description                                              |
| ----------- | -------- | -------------------------------------------------------- |
| `issuer`    | `string` | Auth0 issuer URL (e.g., `https://your-tenant.auth0.com`) |
| `clientId`  | `string` | Auth0 application client ID                              |
| `apiConfig` | `string` | Absolute path to the API config file                     |

### Environment Variables

| Variable          | Used By     | Description                 |
| ----------------- | ----------- | --------------------------- |
| `AUTH0_ISSUER`    | API + Admin | Auth0 issuer URL            |
| `AUTH0_CLIENT_ID` | API + Admin | Auth0 application client ID |

## Full Examples

### Example 1: Basic Auth0 Configuration

**Step 0: Install the `@webiny/auth0` dependency**

`@webiny/auth0` is an optional dependency. Add it to `package.json` using the same version as the `webiny` dependency, then install:

```bash
# Check the webiny version in package.json, then add @webiny/auth0 with the same version
# For example, if "webiny": "^0.0.0-unstable.xxx":
yarn add @webiny/auth0@^0.0.0-unstable.xxx
```

> **Important:** After adding the dependency, tell the user to run `yarn` to install it. Do NOT run `yarn` automatically — let the user do it.

**Step 1: Create the API config**

Create `extensions/auth0/MyAuth0Config.ts`:

```typescript
import { Auth0IdpConfig } from "@webiny/auth0";

class MyIdpConfig implements Auth0IdpConfig.Interface {
  getIdentity(token: Auth0IdpConfig.JwtPayload) {
    return {
      id: String(token["sub"]),
      displayName: token["name"],
      roles: ["full-access"],
      profile: {
        firstName: token["given_name"],
        lastName: token["family_name"],
        email: token["email"]
      },
      context: {
        canAccessTenant: true,
        defaultTenant: "root"
      }
    };
  }
}

const MyAuth0Config = Auth0IdpConfig.createImplementation({
  implementation: MyIdpConfig,
  dependencies: []
});

export default MyAuth0Config;
```

**Step 2: Create the extension component**

Create `extensions/auth0/MyAuth0Extension.tsx`:

```tsx
import React from "react";
import { Auth0 } from "@webiny/auth0";

export const MyAuth0Extension = () => {
  return (
    <Auth0
      issuer={String(process.env.AUTH0_ISSUER)}
      clientId={String(process.env.AUTH0_CLIENT_ID)}
      apiConfig={import.meta.dirname + "/MyAuth0Config.ts"}
    />
  );
};
```

**Step 3: Register in `webiny.config.tsx`**

```tsx
import React from "react";
import { MyAuth0Extension } from "./extensions/auth0/MyAuth0Extension.js";

export const Extensions = () => {
  return (
    <>
      {/* Replace <Cognito /> with Auth0 */}
      <MyAuth0Extension />

      {/* ... other extensions ... */}
    </>
  );
};
```

**Step 4: Set environment variables**

Add to your `.env` file (or CI/CD environment):

```
AUTH0_ISSUER=https://your-tenant.auth0.com/
AUTH0_CLIENT_ID=your-auth0-client-id
```

**Step 5: Deploy**

```bash
yarn webiny deploy
```

### Example 2: Custom Claim Verification

If your Auth0 setup uses custom claims (e.g., via Auth0 Actions or Rules) that need validation:

```typescript
import { Auth0IdpConfig } from "@webiny/auth0";

class MyIdpConfig implements Auth0IdpConfig.Interface {
  getIdentity(token: Auth0IdpConfig.JwtPayload) {
    return {
      id: String(token["sub"]),
      displayName: token["name"],
      roles: [token["https://webiny.com/role"]],
      profile: {
        firstName: token["given_name"],
        lastName: token["family_name"],
        email: token["email"]
      },
      context: {
        canAccessTenant: true,
        defaultTenant: "root"
      }
    };
  }

  verifyTokenClaims(token: Auth0IdpConfig.JwtPayload) {
    // Reject tokens without the required custom claim
    if (!token["https://webiny.com/role"]) {
      throw new Error("Token is missing the 'https://webiny.com/role' claim.");
    }

    // Reject tokens from unauthorized organizations
    if (token["org_id"] && token["org_id"] !== "org_expected") {
      throw new Error("User does not belong to the authorized organization.");
    }
  }
}

const MyAuth0Config = Auth0IdpConfig.createImplementation({
  implementation: MyIdpConfig,
  dependencies: []
});

export default MyAuth0Config;
```

### Example 3: Using DI Dependencies in Config

If your config needs access to other Webiny services (e.g., to look up tenant-specific roles):

```typescript
import { Auth0IdpConfig } from "@webiny/auth0";
import { TenantContext } from "webiny/api/tenancy";

class MyIdpConfig implements Auth0IdpConfig.Interface {
  constructor(private tenantContext: TenantContext.Interface) {}

  getIdentity(token: Auth0IdpConfig.JwtPayload) {
    const tenant = this.tenantContext.getTenant();

    return {
      id: String(token["sub"]),
      displayName: token["name"],
      roles: [token["https://webiny.com/role"]],
      profile: {
        firstName: token["given_name"],
        lastName: token["family_name"],
        email: token["email"]
      },
      context: {
        canAccessTenant: true,
        defaultTenant: tenant?.id ?? "root"
      }
    };
  }
}

const MyAuth0Config = Auth0IdpConfig.createImplementation({
  implementation: MyIdpConfig,
  dependencies: [TenantContext]
});

export default MyAuth0Config;
```

## Quick Reference

### Imports

```typescript
// API config
import { Auth0IdpConfig } from "@webiny/auth0";

// Extension component
import { Auth0 } from "@webiny/auth0";
```

### Key Interfaces

| Interface                     | Package         | Purpose                          |
| ----------------------------- | --------------- | -------------------------------- |
| `Auth0IdpConfig.Interface`    | `@webiny/auth0` | API-side JWT-to-identity mapping |
| `Auth0IdpConfig.JwtPayload`   | `@webiny/auth0` | JWT token payload type           |
| `Auth0IdpConfig.IdentityData` | `@webiny/auth0` | Identity return type             |

### File Structure

```
extensions/auth0/
├── MyAuth0Config.ts        # API config (JWT claim mapping)
└── MyAuth0Extension.tsx    # Extension component (Auth0 setup)
```

### Registration

In `webiny.config.tsx`, replace `<Cognito />` with `<MyAuth0Extension />`.

### Deploy

```bash
yarn webiny deploy        # Deploy all (Core + API + Admin)
```

Both API and Admin need to be redeployed since Auth0 affects both the backend (token verification, identity mapping) and the frontend (login screen).

## Related Skills

- **webiny-configure-okta** — Alternative IDP: configuring Okta authentication
- **webiny-dependency-injection** — The universal DI pattern used by `Auth0IdpConfig.createImplementation()`
- **webiny-project-structure** — How `webiny.config.tsx` and extensions are organized
- **webiny-local-development** — Deploying and testing your Auth0 configuration