All files / src/app/shared/login/auth auth.guard.ts

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import { Injectable } from "@angular/core";
import { ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot } from "@angular/router";
import { LoginService } from "../login.service";
 
@Injectable({
    providedIn: "root",
})
export class AuthGuard implements CanActivate {
    constructor (private loginService: LoginService, private router: Router) {
        this.loginService.init();
    }
 
    canActivate (_next: ActivatedRouteSnapshot, snap: RouterStateSnapshot): boolean {
        if (this.loginService.isLoggedIn()) {
            return true;
        } else {
            sessionStorage.setItem("afterlogin-redirect", snap.url);
            this.router.navigate(["/login"]);
            return false;
        }
    }
}