43 lines
1.5 KiB
TypeScript
43 lines
1.5 KiB
TypeScript
import { Injectable, Inject, PLATFORM_ID } from '@angular/core';
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import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent, HttpResponse } from '@angular/common/http';
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import { Observable, of } from 'rxjs';
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import { tap } from 'rxjs/operators';
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import { TransferState, makeStateKey, StateKey } from '@angular/platform-browser';
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import { isPlatformServer } from '@angular/common';
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@Injectable({
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providedIn: 'root'
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})
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export class HttpInterceptorService implements HttpInterceptor {
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constructor(private transferState: TransferState, @Inject(PLATFORM_ID) private platformId: any) {}
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public intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
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//console.info("intercept transferstate");
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if (request.method !== 'GET') {
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return next.handle(request);
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}
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const key: StateKey<string> = makeStateKey<string>(request.url);
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const storedResponse = this.transferState.get<any>(key, null);
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//console.info(key, storedResponse);
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if (storedResponse) {
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const response = new HttpResponse({body: storedResponse, status: 200});
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if (!isPlatformServer(this.platformId)) {
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//console.info("browser remove: ", key);
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this.transferState.remove(key);
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}
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return of(response);
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} else {
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if (isPlatformServer(this.platformId)) {
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return next.handle(request).pipe(tap((event) => {
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//console.info("server add: ", key);
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this.transferState.set(key, (<HttpResponse<any>>event).body);
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}));
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} else {
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return next.handle(request);
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}
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}
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}
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} |