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feat: design preview support (#1216)
* PreviewContextID interceptor adds PreviewContextID to REST calls
* PreviewService for PreviewContextID handling (set, update, delete)
* changed `{ path: '', redirectTo: 'home', pathMatch: 'full' }` to prevent PreviewContextID query parameter is removed on redirect for empty route path
* documentation (NOT full Design View)
Co-authored-by: Stefan Hauke <s.hauke@intershop.de>
Co-authored-by: Marcel Eisentraut <meisentraut@intershop.de>- Loading branch information
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Jan 16, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http'; | ||
| import { Injectable } from '@angular/core'; | ||
| import { Observable } from 'rxjs'; | ||
|
|
||
| import { PreviewService } from 'ish-core/services/preview/preview.service'; | ||
|
|
||
| /** | ||
| * add PreviewContextID to every request if it is available in the SessionStorage | ||
| */ | ||
| @Injectable() | ||
| export class PreviewInterceptor implements HttpInterceptor { | ||
| constructor(private previewService: PreviewService) {} | ||
|
|
||
| intercept(req: HttpRequest<unknown>, next: HttpHandler): Observable<HttpEvent<unknown>> { | ||
| if (this.previewService.previewContextId) { | ||
| return next.handle( | ||
| req.clone({ | ||
| url: `${req.url};prectx=${this.previewService.previewContextId}`, | ||
| }) | ||
| ); | ||
| } | ||
|
|
||
| return next.handle(req); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| import { TestBed } from '@angular/core/testing'; | ||
| import { RouterTestingModule } from '@angular/router/testing'; | ||
| import { provideMockStore } from '@ngrx/store/testing'; | ||
|
|
||
| import { PreviewService } from './preview.service'; | ||
|
|
||
| describe('Preview Service', () => { | ||
| let previewService: PreviewService; | ||
|
|
||
| beforeEach(() => { | ||
| TestBed.configureTestingModule({ | ||
| imports: [RouterTestingModule], | ||
| providers: [provideMockStore()], | ||
| }); | ||
| previewService = TestBed.inject(PreviewService); | ||
| }); | ||
|
|
||
| it('should be created', () => { | ||
| expect(previewService).toBeTruthy(); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| /* eslint-disable ish-custom-rules/no-intelligence-in-artifacts */ | ||
| import { ApplicationRef, Injectable } from '@angular/core'; | ||
| import { ActivatedRoute, NavigationEnd, Router } from '@angular/router'; | ||
| import { Store, select } from '@ngrx/store'; | ||
| import { Subject, delay, filter, first, fromEvent, map, race, switchMap, take, timer, withLatestFrom } from 'rxjs'; | ||
|
|
||
| import { getICMBaseURL } from 'ish-core/store/core/configuration'; | ||
| import { whenTruthy } from 'ish-core/utils/operators'; | ||
|
|
||
| interface StorefrontEditingMessage { | ||
| type: string; | ||
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| payload?: any; | ||
| } | ||
|
|
||
| interface SetPreviewContextMessage extends StorefrontEditingMessage { | ||
| payload?: { | ||
| previewContextID: string; | ||
| }; | ||
| } | ||
|
|
||
| @Injectable({ providedIn: 'root' }) | ||
| export class PreviewService { | ||
| private allowedHostMessageTypes = ['sfe-setcontext']; | ||
| private initOnTopLevel = false; // for debug purposes. enables this feature even in top-level windows | ||
|
|
||
| private hostMessagesSubject$ = new Subject<StorefrontEditingMessage>(); | ||
| private _previewContextId: string; | ||
|
|
||
| constructor( | ||
| private router: Router, | ||
| private store: Store, | ||
| private appRef: ApplicationRef, | ||
| private route: ActivatedRoute | ||
| ) { | ||
| this.init(); | ||
| race([ | ||
| this.route.queryParams.pipe( | ||
| filter(params => params.PreviewContextID), | ||
| map(params => params.PreviewContextID), | ||
| take(1) | ||
| ), | ||
| // end listening for PreviewContextID if there is no such parameter at initialization | ||
| timer(3000), | ||
| ]).subscribe(value => { | ||
| if (!this.previewContextId && value) { | ||
| this.previewContextId = value; | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Start method that sets up SFE communication. | ||
| * Needs to be called *once* for the whole application, e.g. in the `AppModule` constructor. | ||
| */ | ||
| private init() { | ||
| if (!this.shouldInit()) { | ||
| return; | ||
| } | ||
|
|
||
| this.listenToHostMessages(); | ||
| this.listenToApplication(); | ||
|
|
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| this.hostMessagesSubject$.asObservable().subscribe(message => this.handleHostMessage(message)); | ||
|
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| // Initial startup message to the host | ||
| this.store.pipe(select(getICMBaseURL), take(1)).subscribe(icmBaseUrl => { | ||
| this.messageToHost({ type: 'sfe-pwaready' }, icmBaseUrl); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Decides whether to init the SFE capabilities or not. | ||
| * Is used by the init method, so it will only initialize when | ||
| * (1) there is a window (i.e. the application does not run in SSR/Universal) | ||
| * (2) application does not run on top level window (i.e. it runs in the design view iframe) | ||
| * (3) OR the debug mode is on (`initOnTopLevel`). | ||
| */ | ||
| private shouldInit() { | ||
| return typeof window !== 'undefined' && ((window.parent && window.parent !== window) || this.initOnTopLevel); | ||
| } | ||
|
|
||
| /** | ||
| * Subscribe to messages from the host window (i.e. from the Design View). | ||
| * Incoming messages are filtered by allow list (`allowedMessages`). | ||
| * Should only be called *once* during initialization. | ||
| */ | ||
| private listenToHostMessages() { | ||
| fromEvent<MessageEvent>(window, 'message') | ||
| .pipe( | ||
| withLatestFrom(this.store.pipe(select(getICMBaseURL))), | ||
| filter( | ||
| ([e, icmBaseUrl]) => | ||
| e.origin === icmBaseUrl && | ||
| e.data.hasOwnProperty('type') && | ||
| this.allowedHostMessageTypes.includes(e.data.type) | ||
| ), | ||
| map(([message]) => message.data) | ||
| ) | ||
| .subscribe(this.hostMessagesSubject$); | ||
| } | ||
|
|
||
| /** | ||
| * Listen to events throughout the applicaton and send message to host when | ||
| * (1) route has changed (`sfe-pwanavigation`), | ||
| * (2) application is stable, i.e. all async tasks have been completed (`sfe-pwastable`) or | ||
| * (3) content include has been reloaded (`sfe-pwastable`). | ||
| * | ||
| * The stable event is the notifier for the design view to rerender the component tree view. | ||
| * The event contains the tree, created by `analyzeTree()`. | ||
| * | ||
| * Should only be called *once* during initialization. | ||
| */ | ||
| private listenToApplication() { | ||
| const navigation$ = this.router.events.pipe(filter<NavigationEnd>(e => e instanceof NavigationEnd)); | ||
|
|
||
| const stable$ = this.appRef.isStable.pipe(whenTruthy(), first()); | ||
|
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| const navigationStable$ = navigation$.pipe(switchMap(() => stable$)); | ||
|
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| // send `sfe-pwanavigation` event for each route change | ||
| navigation$ | ||
| .pipe(withLatestFrom(this.store.pipe(select(getICMBaseURL)))) | ||
| .subscribe(([e, icmBaseUrl]) => | ||
| this.messageToHost({ type: 'sfe-pwanavigation', payload: { url: e.url } }, icmBaseUrl) | ||
| ); | ||
|
|
||
| // send `sfe-pwastable` event when application is stable or loading of the content included finished | ||
| navigationStable$ | ||
| .pipe( | ||
| withLatestFrom(this.store.pipe(select(getICMBaseURL))), | ||
| delay(1000) // # animation-delay (css-transition) | ||
| ) | ||
| .subscribe(([, icmBaseUrl]) => this.messageToHost({ type: 'sfe-pwastable' }, icmBaseUrl)); | ||
| } | ||
|
|
||
| /** | ||
| * Send a message to the host window | ||
| * | ||
| * @param message The message to send (including type and payload) | ||
| * @param hostOrigin The window to send the message to. This is necessary due to cross-origin policies. | ||
| */ | ||
| private messageToHost(message: StorefrontEditingMessage, hostOrigin: string) { | ||
| window.parent.postMessage(message, hostOrigin); | ||
| } | ||
|
|
||
| /** | ||
| * Handle incoming message from the host window. | ||
| * Invoked by the event listener in `listenToHostMessages()` when a new message arrives. | ||
| */ | ||
| private handleHostMessage(message: StorefrontEditingMessage) { | ||
| switch (message.type) { | ||
| case 'sfe-setcontext': { | ||
| const previewContextMsg: SetPreviewContextMessage = message; | ||
| this.previewContextId = previewContextMsg?.payload?.previewContextID; | ||
| location.reload(); | ||
| return; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| set previewContextId(previewContextId: string) { | ||
| this._previewContextId = previewContextId; | ||
| if (!SSR) { | ||
| if (previewContextId) { | ||
| sessionStorage.setItem('PreviewContextID', previewContextId); | ||
| } else { | ||
| sessionStorage.removeItem('PreviewContextID'); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| get previewContextId() { | ||
| return this._previewContextId ?? (!SSR ? sessionStorage.getItem('PreviewContextID') : undefined); | ||
| } | ||
| } |
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