ExpressDecorators

This project is trying to achieve to provide Angular-like annotations for using the express framework.

ToDo

• ErrorHandling

Featurelist

This is a list of all features that will be implemented.

Dependency Injection

• Mark a class as @Injectable() to make it accessable to any other managed class.
• A managed class can be anything, controllers, middlewares or even the server.
• If a class is not a anything of the above three, it needs to be defined as a provider in the module it is needed.
• If an injectable class has dependencies on other injectable classes, it will be inject using the constructor.

@Injectable()
export class ExampleInjectableService {

    public getSomeData(): Observable<Data> {
        return ["Hello World"];
    }
}

Modules

• A module should be able to define everything related to the application (Controllers, Middlewares).
• A module defines everything all of its controllers and middlewares need.

Example:

@Module({
    controllers: [
        ExampleController
    ],
    middlewares: [
        ExampleMiddleware
    ],
    providers: [
        ExampleInjectableService
    ]
})
export class ExampleModule {}

Server

• The server should be able to mount 1 to n modules.
• It defines on which port it runs.
• Middlewares should be able to be attached.

@Server({
    port: 8080,
    middlewares: [
        BodyParser,
        CORS
    ],
    imports: [
        ExampleModule
    ],
    providers: [
        AuthenticationService
    ]
})
export class ExampleServer {}

Controller

• A controller can define functions for a specific routes that handle the request.
• Middlewares should be able to be applied to the controller or controller function.
• Mark functions as Get, Post, Put or Delete to make them resolve to a URI.
• A controller function should be able to have middlewares.

@Controller({
    path: '/exmaplepath',
    middlewares: [
        Authorized
    ]
})
export class ExampleController {

    constructor(private exampleInjectableService: ExampleInjectableService) {}

    @Get({
        path: '/{id}',
        middlewares: []
    })
    public getExampleData(@ResponseParam() response: Response, @PathVariable id: number) {
        this.exampleInjectableService.getExampleData().subscribe(data => response.send(data));
    }
}

Middleware

• A middleware should intercept a request to a resource and decide to weather or not the request shall be passed on.

@Middleware()
export class ExampleMiddleware {

    constructor(private authorizationService: AuthorizationService) {}

    public onRequest(@ResponseParam response: Response, @Next next: NextFunction) {
        this.authorizationService.isAuthorized(token).subscribe(authorized => {
            if (authorized) {
                next()
            } else {
                response.sendStatus(401);
            }
        });
    }
}

App

@App({
    bootstrap: [ExampleServer]
})
export class ExampleApp extends ExpressApp {}

const exampleApp = new ExampleApp()
exampleApp.start((server) => {
    console.log("Application is running on port: " + server.port);
}, (error) => {
    console.log("Error: Could not start application.", error);
})