Asymmetrik/ngx-starter

import { NgIf } from '@angular/common';
import { Directive, Injector, OnInit, effect, inject, input } from '@angular/core';

import { APP_SESSION } from '../../tokens';
import { Role } from '../role.model';

@Directive({
    selector: '[hasRole]',
    hostDirectives: [
        {
            directive: NgIf,
            inputs: ['ngIfElse: hasRoleElse', 'ngIfThen: hasRoleThen']
        }
    ],
    standalone: true
})
export class HasRoleDirective implements OnInit {
    readonly #ngIfDirective = inject(NgIf);
    readonly #injector = inject(Injector);
    readonly #session = inject(APP_SESSION);

    readonly role = input.required<string | Role>({ alias: 'hasRole' });
    readonly andCondition = input(true, { alias: 'hasRoleAnd' });
    readonly orCondition = input(false, { alias: 'hasRoleOr' });

    ngOnInit() {
        effect(
            () => {
                this.updateNgIf();
            },
            { injector: this.#injector }
        );
    }

    private updateNgIf() {
        this.#ngIfDirective.ngIf =
            this.orCondition() || (this.andCondition() && this.#session().hasRole(this.role()));
    }
}