src/app/store/root/services/user-role-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 {EAPIUserRoles} from "../../../core/api/core";
import {arrayJoin} from "../../../util/store";
import {isLoadingSelector, userRolesSelector} from "../selectors";

export interface IUserRoleRouteGuardConfiguration {

    allowed: EAPIUserRoles[];

}

export abstract class UserRoleRouteGuardService implements CanActivate {

    public redirectUrlTree: UrlTree = this.router.createUrlTree(["/"]);

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

    public isAllowed$ = this.store.pipe(
        select(userRolesSelector),
        map((userRoles) => arrayJoin(userRoles).some((role) => this.isUserRoleAllowed(role)))
    );

    protected constructor(
        public store: Store,
        public router: Router,
        public config: IUserRoleRouteGuardConfiguration
    ) {

    }

    public isUserRoleAllowed(role: EAPIUserRoles): boolean {
        return arrayJoin(this.config?.allowed).indexOf(role) > -1;
    }

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

}


@Injectable({providedIn: "root"})
export class OfficialInChargeRouteGuardService extends UserRoleRouteGuardService {

    public constructor(store: Store, router: Router) {
        super(store, router, {allowed: [EAPIUserRoles.SPA_OFFICIAL_IN_CHARGE]});
    }

}

@Injectable({providedIn: "root"})
export class OfficialInChargeOrAdminRouteGuardService extends UserRoleRouteGuardService {

    public constructor(store: Store, router: Router) {
        super(store, router, {allowed: [EAPIUserRoles.SPA_OFFICIAL_IN_CHARGE, EAPIUserRoles.SPA_ADMIN]});
    }

}