# nest-oidc-provider

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## Description

[oidc-provider](https://github.com/panva/node-oidc-provider) module for [Nest](https://github.com/nestjs/nest) framework (node.js)

## NestJS compatibility table

| nest-oidc-provider | NestJS |
|---|---:|
| 2.x | >= 9 and < 11 |
| 3.x | >= 11 |

## Installation

```bash
$ npm i --save nest-oidc-provider oidc-provider
```

OR

```bash
$ yarn add nest-oidc-provider oidc-provider
```

OR

```bash
$ pnpm add nest-oidc-provider oidc-provider
```

## Setup

> ⚠️ Version 8 of `oidc-provider` [is now ESM-only](<https://github.com/panva/node-oidc-provider/releases/tag/v8.0.0#:~:text=tokens%20(cb67083)-,oidc%2Dprovider%20is%20now%20an%20ESM%2Donly%20module,-(3c5ebe1)>), which is not yet supported by NestJS natively ([nest#7021](https://github.com/nestjs/nest/issues/7021), [nest#8736](https://github.com/nestjs/nest/pull/8736)). This library enables the use of the ESM-only version of `oidc-provider` for Node.js <= 20.17.x via dynamic imports. To avoid errors like [ERR_REQUIRE_ESM], all interfaces should be imported from this package, and the module should be accessed through dependency injection. Use `@InjectOidcModule()` to inject the `oidc-provider` module and `@InjectOidcProvider()` for the running instance. **You must not import anything directly from** `oidc-provider`, unless you're using Node.js >= 20.17.x with the experimental `--experimental-require-module` flag ([#54447](https://github.com/nodejs/node/pull/54447))!

### TypeScript

You need to install the `oidc-provider` @types package if you want to use the re-exported types from this library.

```bash
npm install @types/oidc-provider --save-dev
```

### Basic configuration

```ts
@Module({
  imports: [
    OidcModule.forRoot({
      issuer: 'http://localhost:3000',
      path: '/oidc',
      oidc: ... // oidc-provider configuration
    })
  ],
})
export class AppModule {}
```

### Custom factory function

You can pass a `factory` function to customize the provider instantiation.

```ts
@Module({
  imports: [
    OidcModule.forRoot({
      issuer: 'http://localhost:3000',
      path: '/oidc',
      factory: ({ issuer, config, module }) => {
        // `module` is the import from `oidc-provider`
        const provider = new module.Provider(issuer, config);
        provider.on('server_error', (ctx, err) => {...})
        return provider;
      },
      oidc: ... // oidc-provider configuration
    })
  ],
})
export class AppModule {}
```

### Trusting TLS offloading proxies

You can set the `proxy` option to `true` to trust TLS offloading proxies.\
For more info visit the `oidc-provider` documentation: [Trusting TLS offloading proxies](https://github.com/panva/node-oidc-provider/blob/v7.12.0/docs/README.md#trusting-tls-offloading-proxies)

```ts
@Module({
  imports: [
    OidcModule.forRoot({
      issuer: 'http://localhost:3000',
      path: '/oidc',
      proxy: true, // <- trust TLS offloading proxies
      oidc: {...}
    })
  ],
})
export class AppModule {}
```

### Dynamic host routing

You can set the `host` option to require the HTTP host of incoming requests to match some specific value before they are processed by the [`oidc-provider`](https://github.com/panva/node-oidc-provider/blob/main/docs/README.md#basic-configuration-example) callback.

For more info visit the NestJS documentation: [Sub-domain routing](https://docs.nestjs.com/controllers#sub-domain-routing).

```ts
@Module({
  imports: [
    OidcModule.forRoot({
      issuer: 'https://oidc.example.com',
      path: '/oidc',
      host: 'oidc.example.com', // <- Use a specific host/subdomain
      oidc: {...}
    })
  ],
})
export class AppModule {}
```

### Async configuration

#### `useFactory`

```ts
@Module({
  imports: [
    OidcModule.forRootAsync({
      imports: [ConfigModule],
      useFactory: async (configService: ConfigService) => ({
        issuer: configService.get<string>('ISSUER'),
        path: configService.get<string>('OIDC_PATH'),
        oidc: ... // oidc-provider configuration
      }),
      inject: [ConfigService],
    }),
  ],
})
export class AppModule {}
```

#### `useClass`

```ts
@Module({
  imports: [
    OidcModule.forRootAsync({
      useClass: OidcConfigService,
    }),
  ],
})
export class AppModule {}
```

Note that in this example, the `OidcConfigService` has to implement the `OidcModuleOptionsFactory` interface, as shown below.

```ts
import type { OidcModuleOptionsFactory } from 'nest-oidc-provider';

@Injectable()
export class OidcConfigService implements OidcModuleOptionsFactory {
  constructor(private readonly @InjectConnection() conn: Connection) {}

  createModuleOptions(): OidcModuleOptions {
    return {
      issuer: 'http://localhost:3001',
      path: '/oidc',
      oidc: ..., // oidc-provider configuration
    };
  }

  createAdapterFactory?(): AdapterFactory {
    return (modelName: string) => new MyAdapter(modelName, this.conn);
  }
}
```

You can omit the `Adapter` option of oidc-provider configuration if you implement the `createAdapterFactory` method.

#### `useExisting`

```ts
@Module({
  imports: [
    OidcModule.forRootAsync({
      imports: [OidcConfigModule],
      useExisting: OidcConfigService,
    }),
  ],
})
export class AppModule {}
```

## Custom injection decorators

To be able to access the exports of the `oidc-provider` module or the running instance, you need to use decorators or injection tokens:

```ts
import {
  InjectOidcModule,
  InjectOidcProvider,
  type Provider,
  type ProviderModule,
} from 'nest-oidc-provider';

@Controller('/some-controller')
export class SomeController {
  constructor(
    /** Returns exports from the `oidc-provider` module */
    @InjectOidcModule() oidc: ProviderModule,
    /** Returns the running `oidc-provider` instance */
    @InjectOidcProvider() provider: Provider,
  ) {}
}
```

OR

```ts
import {
  OIDC_PROVIDER,
  OIDC_PROVIDER_MODULE,
  type Provider,
  type ProviderModule,
} from 'nest-oidc-provider';

async function bootstrap() {
  const app = await NestFactory.create<NestExpressApplication>(AppModule);

  const { Provider, errors, interactionPolicy } =
    app.get<ProviderModule>(OIDC_PROVIDER_MODULE);
  const provider = app.get<Provider>(OIDC_PROVIDER);

  await app.listen(3000);
}
```

## Custom param decorators

### `@OidcInteraction()`

Returns an instance of `InteractionHelper` class.

```ts
import { OidcInteraction, type InteractionHelper } from 'nest-oidc-provider';

@Get(':uid')
@Render('login')
async login(
  @OidcInteraction() interaction: InteractionHelper
) {
  const { prompt, params, uid } = await interaction.details();

  const client = await this.provider.Client.find(params.client_id as string);

  return { prompt, client, params, uid, ...};
}
```

The `InteractionHelper` class is just a helper that omits the `req` and `res` parameters from the existing interaction methods in `oidc-provider`.

```ts
interface InteractionHelper {
  details(): Promise<InteractionDetails>;

  finished(
    result: InteractionResults,
    options?: { mergeWithLastSubmission?: boolean },
  ): Promise<void>;

  result(
    result: InteractionResults,
    options?: { mergeWithLastSubmission?: boolean },
  ): Promise<string>;
}
```

### `@OidcContext()`

Returns an instance of `KoaContextWithOIDC`.

```ts
import { OidcContext, type KoaContextWithOIDC } from 'nest-oidc-provider';

@Get()
async index(@OidcContext() ctx: KoaContextWithOIDC) {
  const { oidc: { provider } } = ctx;
  const session = await provider.Session.get(ctx);
  //...
}
```

### `@OidcSession()`

Returns the user `Session` from the current context, equivalent to retrieving the session from `KoaContextWithOIDC`.

```ts
import { OidcSession, type Session } from 'nest-oidc-provider';

@Get()
async index(@OidcSession() session: Session) {
  //...
}
```

## Examples

A complete example can be found in the [example](example) directory.

## Contributing

You are welcome to contribute to this project, just open a PR.

## CHANGELOG

See [CHANGELOG](CHANGELOG.md) for more information.

## License

This project is [MIT licensed](LICENSE).