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import { ApplicationRef, Injectable } from '@angular/core';
import { Store, select } from '@ngrx/store';
import { CookieOptions } from 'express';
import { isEqual } from 'lodash-es';
import {
BehaviorSubject,
Observable,
OperatorFunction,
Subject,
combineLatest,
iif,
interval,
noop,
of,
race,
throwError,
timer,
} from 'rxjs';
import {
catchError,
concatMap,
distinctUntilChanged,
filter,
first,
map,
mergeMap,
pairwise,
shareReplay,
startWith,
switchMap,
take,
tap,
withLatestFrom,
} from 'rxjs/operators';
import { BasketView } from 'ish-core/models/basket/basket.model';
import { User } from 'ish-core/models/user/user.model';
import { ApiService } from 'ish-core/services/api/api.service';
import { getCurrentBasket, getCurrentBasketId, loadBasketByAPIToken } from 'ish-core/store/customer/basket';
import { getOrder, getSelectedOrderId, loadOrderByAPIToken } from 'ish-core/store/customer/orders';
import {
fetchAnonymousUserToken,
getLoggedInUser,
getUserAuthorized,
loadUserByAPIToken,
} from 'ish-core/store/customer/user';
import { CookiesService } from 'ish-core/utils/cookies/cookies.service';
import { whenTruthy } from 'ish-core/utils/operators';
type ApiTokenCookieType = 'user' | 'order';
export interface ApiTokenCookie {
apiToken: string;
type: ApiTokenCookieType;
isAnonymous?: boolean;
orderId?: string;
creator?: string;
}
// If no expiry date is supplied by the token endpoint, this value (in ms) is used
const DEFAULT_EXPIRY_TIME = 3600000;
@Injectable({ providedIn: 'root' })
export class ApiTokenService {
/**
* stores current apiToken information, will be used to add authentication header for each request
*/
private apiToken$: BehaviorSubject<string>;
/**
* informs subscriber that cookie is unexpectedly removed (e.g. logout from another tab)
*/
private cookieVanishes$ = new Subject<ApiTokenCookieType>();
/**
* cookie options which are used to store apiToken cookie, will be overwritten by setApiToken() method
*/
private cookieOptions: CookieOptions = {};
/**
* informs subscriber (e.g. restore$()) with value from initial apiToken cookie,
* is used by tokenCreatedOnAnotherTab() method to trigger restore$() method again
*/
private initialCookie$: BehaviorSubject<ApiTokenCookie>;
/**
* informs subscriber whenever an apiToken has been changed
*/
private cookieChangeEvent$: Observable<[ApiTokenCookie, ApiTokenCookie]>;
constructor(private cookiesService: CookiesService, private store: Store, private appRef: ApplicationRef) {
// setup initial values
const initialCookie = this.parseCookie();
this.initialCookie$ = new BehaviorSubject<ApiTokenCookie>(!SSR ? initialCookie : undefined);
this.apiToken$ = new BehaviorSubject<string>(initialCookie?.apiToken);
if (!SSR) {
// multicast apiTokenCookieChange$ to avoid multiple listeners
this.cookieChangeEvent$ = this.apiTokenCookieChange$().pipe(shareReplay(1));
// save internal calculated apiToken as cookie whenever apiToken, basket, user or order information changes
this.calculateApiTokenCookieValueOnChanges$().subscribe(apiToken => {
const cookieContent = apiToken?.apiToken ? JSON.stringify(apiToken) : undefined;
if (cookieContent) {
this.cookiesService.put('apiToken', cookieContent, {
expires: this.cookieOptions?.expires ?? new Date(Date.now() + DEFAULT_EXPIRY_TIME),
secure: this.cookieOptions?.secure,
path: '/',
});
}
});
// remove apiToken cookie on logout
// path: '/' is added in order to remove cookie within a multi-site configuration (e.g. configured /en, /fr, /de routes)
this.logoutUser$().subscribe(() => this.cookiesService.remove('apiToken', { path: '/' }));
// unset apiToken when cookie vanishes/ has been removed unexpectedly and notify public event stream
this.tokenVanish$().subscribe(type => {
this.removeApiToken();
this.cookieVanishes$.next(type);
});
// initialize restore$ mechanism when apiToken cookie is created outside of current PWA context (e.g. login in another tab)
this.tokenCreatedOnAnotherTab$().subscribe(noop);
}
}
getApiToken$(): Observable<string> {
return this.apiToken$.asObservable();
}
/**
* removes the current apiToken cookie
*/
removeApiToken() {
this.apiToken$.next(undefined);
}
/**
* sets new apiToken and new apiToken cookie options when available
*/
setApiToken(apiToken: string, options?: CookieOptions) {
Iif (options) {
this.cookieOptions = options;
}
this.apiToken$.next(apiToken);
}
hasUserApiTokenCookie() {
const apiTokenCookie = this.parseCookie();
return apiTokenCookie?.type === 'user' && !apiTokenCookie?.isAnonymous;
}
/**
* trigger actions to restore store information based on initial apiToken cookie
*/
restore$(types: ApiTokenCookieType[] = ['user', 'order']): Observable<boolean> {
Iif (SSR) {
return of(true);
}
return this.initialCookie$.pipe(
first(),
switchMap(cookie => {
if (types.includes(cookie?.type)) {
switch (cookie?.type) {
case 'user': {
if (cookie.isAnonymous) {
this.store.dispatch(loadBasketByAPIToken({ apiToken: cookie.apiToken }));
// wait until basket infos are loaded
return race(
this.store.pipe(
select(getCurrentBasketId),
whenTruthy(),
take(1),
map(() => true)
),
timer(5000).pipe(map(() => false))
);
} else {
this.store.dispatch(loadUserByAPIToken());
// wait until user is logged in
return race(
this.store.pipe(select(getUserAuthorized), whenTruthy(), take(1)),
timer(5000).pipe(map(() => false))
);
}
}
case 'order': {
this.store.dispatch(loadOrderByAPIToken({ orderId: cookie.orderId, apiToken: cookie.apiToken }));
// wait until order is loaded
return race(
this.store.pipe(
select(getOrder(cookie.orderId)),
whenTruthy(),
take(1),
map(() => true)
),
timer(5000).pipe(map(() => false))
);
}
}
}
return of(true);
})
);
}
getCookieVanishes$(): Observable<ApiTokenCookieType> {
return this.cookieVanishes$.asObservable();
}
intercept(req: HttpRequest<unknown>, next: HttpHandler): Observable<HttpEvent<unknown>> {
return iif(
() => req.url.endsWith('/baskets') && req.method === 'POST', // only on basket creation an anonymous user token can be created
this.anonymousUserTokenMechanism(),
of(true)
).pipe(
switchMap(() =>
this.appendAuthenticationHeader(req).pipe(
concatMap(request =>
next.handle(request).pipe(
map(event => {
// remove id_token from /token response
// TODO: remove http request body adaptions if correct id_tokens are returned
Iif (
event instanceof HttpResponse &&
event.url.endsWith('token') &&
request.body instanceof HttpParams
) {
return event.clone({
body: {
...event.body,
id_token: undefined,
},
});
}
return event;
}),
catchError(err => {
Iif (this.isAuthTokenError(err)) {
this.invalidateApiToken();
// retry request without auth token
const retryRequest = request.clone({
headers: request.headers.delete(ApiService.TOKEN_HEADER_KEY),
});
// timer introduced for testability
return timer(500).pipe(switchMap(() => next.handle(retryRequest)));
}
return throwError(() => err);
})
)
)
)
)
);
}
/**
* will remove apiToken and inform cookieVanishes$ listeners that cookie in not working as expected
*/
private invalidateApiToken() {
const cookie = this.parseCookie();
this.removeApiToken();
Iif (cookie) {
this.cookieVanishes$.next(cookie?.type);
}
}
private isAuthTokenError(err: unknown) {
return (
err instanceof HttpErrorResponse &&
typeof err.error === 'string' &&
(err.error.includes('AuthenticationToken') || err.error.includes('Unable to decode token')) // possible auth token error codes
);
}
/**
* append authentication header to current request in case an apiToken is available and specific header was not set before
*/
private appendAuthenticationHeader(req: HttpRequest<unknown>): Observable<HttpRequest<unknown>> {
return this.apiToken$.pipe(
map(apiToken =>
apiToken && !req.headers?.has(ApiService.TOKEN_HEADER_KEY)
? req.clone({ headers: req.headers.set(ApiService.TOKEN_HEADER_KEY, apiToken) })
: req
),
first()
);
}
/**
* process to trigger action to fetch anonymous user token and wait until apiToken is set in service
*/
private anonymousUserTokenMechanism(): Observable<unknown> {
return this.apiToken$.pipe(
switchMap(
apiToken =>
iif(() => !apiToken, of(false).pipe(tap(() => this.store.dispatch(fetchAnonymousUserToken()))), of(true)) // fetch anonymous user token only when api token is not available
),
whenTruthy(),
first()
);
}
/**
* Observable which emits with the last two apiToken cookie data only, when these have changed within 1000ms interval
*/
private apiTokenCookieChange$(): Observable<[ApiTokenCookie, ApiTokenCookie]> {
return this.appRef.isStable.pipe(
whenTruthy(),
first(),
mergeMap(() =>
interval(1000).pipe(
map(() => this.parseCookie()),
pairwise(),
distinctUntilChanged((prev, curr) => isEqual(prev, curr))
)
)
);
}
/**
* notify subscriber when user has been logged out
*/
private logoutUser$(): Observable<boolean> {
return this.store.pipe(
select(getLoggedInUser),
startWith(undefined),
pairwise(),
filter(([previous, current]) => !!previous && !current),
map(() => true)
);
}
/**
* @returns calculate current apiToken cookie value based on the internal store$ state
*/
private calculateApiTokenCookieValueOnChanges$(): Observable<ApiTokenCookie> {
return combineLatest([
this.store.pipe(select(getLoggedInUser)),
this.store.pipe(select(getCurrentBasket)),
this.store.pipe(select(getSelectedOrderId)),
this.apiToken$,
]).pipe(
switchMap(value => of(value)),
this.mapToApiTokenCookie(),
filter(apiToken => !!apiToken?.apiToken),
distinctUntilChanged<ApiTokenCookie>(isEqual)
);
}
/**
* @returns previous apiToken cookie type when the cookie vanishes
*/
private tokenVanish$(): Observable<ApiTokenCookieType> {
// access token vanishes routine
return this.cookieChangeEvent$.pipe(
withLatestFrom(this.apiToken$),
filter(([[previous, current], apiToken]) => !!previous && !current && !!apiToken),
map(([[previous]]) => previous.type)
);
}
/**
* initialize restore$ mechanism when apiToken cookie is created outside of current PWA context
*
* Steps:
*
* (1): stream got notified when 'apiToken' cookie changes
*
* (2): check that a user token cookie was added in comparison to previous cookie value
*
* (3): calculate a current apiToken cookie value of current pwa context
*
* (4): filter stream values when calculated apiToken cookie value is not truthy --> cookie was added from another tab
*
* (5): set new apiToken and initialCookie$ values with information from current apiToken cookie in order to fetch data via restore$
*
*/
private tokenCreatedOnAnotherTab$(): Observable<boolean> {
// cookie created routine when user is logged in in an another tab
return this.cookieChangeEvent$.pipe(
filter(([previous, current]) => !previous && current?.type === 'user' && !!current?.apiToken), // first time after a login cookie appears
withLatestFrom(
this.store.pipe(select(getLoggedInUser)),
this.store.pipe(select(getCurrentBasket)),
this.store.pipe(select(getSelectedOrderId)),
this.apiToken$
),
switchMap(([[, current], ...ctx]) =>
of(ctx).pipe(
this.mapToApiTokenCookie(),
filter(calculated => !calculated), // application calculated no api token cookie although an user cookie is stored
map(() => current)
)
),
tap(cookieValue => {
this.setApiToken(cookieValue.apiToken);
this.initialCookie$.next(cookieValue);
}),
switchMap(() => this.restore$())
);
}
private mapToApiTokenCookie(): OperatorFunction<[User, BasketView, string, string], ApiTokenCookie> {
return (source$: Observable<[User, BasketView, string, string]>) =>
source$.pipe(
map(([user, basket, orderId, apiToken]): ApiTokenCookie => {
if (user) {
return { apiToken, type: 'user', isAnonymous: false, creator: 'pwa' };
} else if (basket) {
return { apiToken, type: 'user', isAnonymous: true, creator: 'pwa' };
} else if (orderId) {
return { apiToken, type: 'order', orderId, creator: 'pwa' };
}
const apiTokenCookieString = this.cookiesService.get('apiToken');
const apiTokenCookie: ApiTokenCookie = apiTokenCookieString ? JSON.parse(apiTokenCookieString) : undefined;
if (apiToken && apiTokenCookie) {
return { ...apiTokenCookie, apiToken }; // overwrite existing cookie information with new apiToken
}
})
);
}
private parseCookie(): ApiTokenCookie {
const cookieContent = this.cookiesService.get('apiToken');
if (cookieContent) {
try {
return JSON.parse(cookieContent);
} catch (err) {
// ignore
}
}
return;
}
}
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