cothema / ionic-universal-firebase-login

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

import {

    ActivatedRouteSnapshot,

    CanActivate,

    CanActivateChild,

    Router,

    RouterStateSnapshot,

} from "@angular/router";

import { map, take, tap } from "rxjs/operators";

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

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

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

@Injectable({

    providedIn: "root",

})

export class AuthGuard<User extends UserModel = UserModel>

    implements CanActivate, CanActivateChild {

    public constructor(

        protected auth: BaseAuthService<User>,

        protected router: Router,

        protected config: UniFirebaseLoginConfig,

    ) {}

    public async canActivate(

        next: ActivatedRouteSnapshot,

        state: RouterStateSnapshot,

    ): Promise<boolean> {

        const user$ = this.auth.getUser();

        return user$

            .pipe(

                take(1),

                map(user => !!user), // Map to boolean

                tap(loggedIn => {

                    if (!loggedIn) {

                        // Access denied

                        const redirectTo = this.config.signInPage;

                        console.log(

                            `Insufficient permissions, redirecting to: ${redirectTo}`,

                        );

                        return this.router.navigate([redirectTo]);

                    }

                }),

            )

            .toPromise();

    }

    public canActivateChild(

        next: ActivatedRouteSnapshot,

        state: RouterStateSnapshot,

    ): Promise<boolean> {

        return this.canActivate(next, state);

    }

}