51 lines
1.3 KiB
TypeScript
51 lines
1.3 KiB
TypeScript
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import { Injectable } from '@angular/core';
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import { Router, RoutesRecognized } from '@angular/router';
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import { filter, pairwise } from 'rxjs/operators';
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/**
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* Watches URL changes.
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* Can be enhanced using locale storage to support back-navigation even after reload
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*/
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@Injectable({
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providedIn: 'root'
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})
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export class RoutingStateService {
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/**
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* Hold the previous URL
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*/
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private _previousUrl: string;
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/**
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* Unsafe paths that the user should not go "back" to
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* TODO: Might also work using Routing parameters
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*/
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private unsafeUrls: string[] = ['/login', '/privacypolicy', '/legalnotice'];
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/**
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* @return Get the previous URL
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*/
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public get previousUrl(): string {
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return this._previousUrl ? this._previousUrl : null;
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}
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public get isSafePrevUrl(): boolean {
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return !!this.previousUrl && !this.unsafeUrls.includes(this.previousUrl);
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}
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/**
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* Watch routing changes and save the last visited URL
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*
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* @param router Angular Router
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*/
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public constructor(private router: Router) {
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this.router.events
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.pipe(
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filter(e => e instanceof RoutesRecognized),
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pairwise()
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)
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.subscribe((event: any[]) => {
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this._previousUrl = event[0].urlAfterRedirects;
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});
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}
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}
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