Router pipelines (hooks)

Aurelia's router uses a pipeline concept for processing navigation. You can add your own steps to this pipeline for things like authorization, loading indicators, or analytics tracking.

Steps are added using methods like addAuthorizeStep(), addPreActivateStep(), addPreRenderStep(), or addPostRenderStep().

Here's an example of an authorization step:

import { RouterConfiguration, NavigationInstruction, Next, Redirect } from 'aurelia-router';

export class App {
  configureRouter(config: RouterConfiguration): void {
    config.addAuthorizeStep(AuthorizeStep);
    // ... other configuration
  }
}

class AuthorizeStep {
  run(navigationInstruction: NavigationInstruction, next: Next): Promise<any> {
    if (navigationInstruction.getAllInstructions().some(i => i.config.settings.auth)) {
      var isLoggedIn = // ... check if user is logged in
      if (!isLoggedIn) {
        return next.cancel(new Redirect('login'));
      }
    }

    return next();
  }
}

In this example, the AuthorizeStep checks if any of the routes being activated require authentication (by checking a hypothetical auth property in the route's settings). If authentication is required and the user isn't logged in, it redirects to a login page.