cothema / ionic-universal-firebase-login

import { Injectable } from "@angular/core";

import {

    ActivatedRouteSnapshot,

    CanActivate,

    CanActivateChild,

    Router,

    RouterStateSnapshot,

} from "@angular/router";

import { Observable } from "rxjs";

import { UniFirebaseLoginConfig } from "../config/uni-firebase-login-config";

import { UniFirebaseLoginConfigProvider } from "../config/uni-firebase-login-config-provider";

import { UserModel } from "../model/user-model";

import { BaseAuthService } from "../services/base-auth-service";

@Injectable({

    providedIn: "root",

})

export class NonAuthGuard<User extends UserModel = UserModel>

    implements CanActivate, CanActivateChild {

    protected config: UniFirebaseLoginConfig;

    public constructor(

        protected auth: BaseAuthService<User>,

        protected router: Router,

        configProvider: UniFirebaseLoginConfigProvider,

    ) {

        this.config = configProvider.config;

    }

    public canActivate(

        next: ActivatedRouteSnapshot,

        state: RouterStateSnapshot,

    ): Observable<boolean> {

        return new Observable(subscriber => {

            this.auth.userInitialized$.subscribe(initialized => {

                if (initialized) {

                    this.auth.user$.subscribe(user => {

                        const loggedIn = !!user;

                        if (loggedIn) {

                            // Access denied

                            const redirectTo = this.config.afterSignInPage;

                            console.log(

                                `Cannot be logged in on this page, redirecting to: ${redirectTo}`,

                            );

                            this.router.navigate([redirectTo]);

                            subscriber.next(false);

                        } else {

                            subscriber.next(true);

                        }

                        subscriber.complete();

                    });

                }

            });

        });

    }

    public canActivateChild(

        next: ActivatedRouteSnapshot,

        state: RouterStateSnapshot,

    ): Observable<boolean> {

        return this.canActivate(next, state);

    }

}