openaire-library/http-interceptor.service.ts

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