Dart OpenApi Code Generator

openapi_code_builder generates server stubs and client libraries for open api schema yaml files.

This is a build_runner library meant to be included in the dev_dependencies of your project to allow generating of dart source files for client and server stubs for OpenAPI 3.0 schema files (Only yaml is supported right now).

See directory for an example usage.

You can also try out the code generator right inside your browser: https://hpoul.github.io/openapi_dart/

Flutter Screenshot

Real world example

See the backend for AuthPass which uses auto generated openapi basically as http server. Yaml file available on github.

Usage

  1. Update pubspec.yaml: 
     dependencies:
   json_annotation: ^3.0.1
   openapi_base: any

 dev_dependencies:
   openapi_code_builder: any
   json_serializable: ^3.3.0
   build_runner: ^1.10.0
  2. Create your schema file into your lib folder with the extension .openapi.yaml
  3. Optional: Add the base name to your schema 
    openapi: 3.0.0
info:
  x-dart-name: MyApiName
  4. Run the build_runner: 
    (flutter) pub run build_runner build --delete-conflicting-outputs
  5. Implement the server and client. (see below)

Example schema

openapi: 3.0.0
info:
  version: 0.1.0
  title: Example API
  x-dart-name: TestApi

paths:
  /hello/{name}:
    parameters:
      - name: name
        in: path
        required: true
        schema:
          type: string
    get:
      summary: Say Hello World to {name}
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HelloResponse'
components:
  schemas:
    HelloResponse:
      properties:
        message:
          type: string
          description: 'The Hello World greeting ;-)'

Implement Server

class TestApiImpl extends TestApi {
  @override
  Future<HelloNameGetResponse> helloNameGet({String name}) async {
    _logger.info('Saying hi to $name');
    return HelloNameGetResponse.response200(
        HelloResponse(message: 'Hello $name'));
  }
}

Create a server and bind it to a port

Future<void> main() async {
  PrintAppender.setupLogging();
  _logger.fine('Starting Server ...');
  final server = OpenApiShelfServer(
    TestApiRouter(ApiEndpointProvider.static(TestApiImpl())),
  );
  server.startServer();
}

Implement Client

Future<void> main() async {
  final requestSender = HttpRequestSender();
  final client = TestApiClient(
      Uri.parse('http://localhost:8000'),
      requestSender);
  final blubb = await client.helloNameGet(name: 'Blubb');
  blubb.map(
    on200: (response) => _logger.info('Success: ****${response.body.message}'),
  );
  _logger.info('Response: $blubb');
  requestSender.dispose();
}

Try it out

Run in openapi_dart/packages/openapi_code_builder/example

Server

dart run bin/example_server.dart

Client

dart run bin/example_client.dart

Libraries

openapi_code_builder