src/app/features/new/services/new-statement-route-guard.service.ts

/********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/

import {Injectable} from "@angular/core";
import {ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot, UrlTree} from "@angular/router";
import {select, Store} from "@ngrx/store";
import {Observable} from "rxjs";
import {filter, map, switchMap} from "rxjs/operators";
import {isLoadingSelector, isOfficialInChargeSelector} from "../../../store";

@Injectable({providedIn: "root"})
export class NewStatementRouteGuardService implements CanActivate {

    public readonly isInitialized$ = this.store.pipe(
        select(isLoadingSelector),
        filter((isLoading) => !isLoading)
    );

    public readonly isAllowed$ = this.store.pipe(
        select(isOfficialInChargeSelector)
    );

    private readonly redirectUrlTree = this.router.createUrlTree(["/"]);

    public constructor(private readonly store: Store, private readonly router: Router) {
    }

    public canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean | UrlTree> {
        return this.isInitialized$.pipe(
            switchMap(() => this.isAllowed$),
            map((isAllowed) => isAllowed ? isAllowed : this.redirectUrlTree)
        );
    }

}