openaire-library/http-interceptor.service.ts

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import {Injectable, Inject, PLATFORM_ID, Optional} from '@angular/core';
import {HttpInterceptor, HttpRequest, HttpHandler, HttpEvent, HttpResponse, HttpHeaders} 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';
import {properties} from "../../environments/environment";
import {REQUEST} from "./utils/tokens";
import * as Xhr2 from 'xhr2';
Xhr2.prototype._restrictedHeaders = {};
@Injectable()
export class HttpInterceptorService implements HttpInterceptor {
private static HTTP_WHITELIST = [];
constructor(private transferState: TransferState, @Inject(PLATFORM_ID) private platformId: any, @Optional() @Inject(REQUEST) protected req: any) {
}
public intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
if (request.method !== 'GET' || this.isService(request, HttpInterceptorService.HTTP_WHITELIST)) {
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)) {
if(request.url.startsWith('/assets') || request.url.startsWith('assets')) {
return of(null);
}
let headers = new HttpHeaders();
if(request.withCredentials && !properties.hasMachineCache) {
headers = headers.set('Cookie', this.req.get('Cookie'));
}
const authReq = request.clone({
headers: headers
});
return next.handle(authReq).pipe(tap((event) => {
//console.info("server add: ", key);
this.transferState.set(key, (<HttpResponse<any>>event).body);
}));
} else {
return next.handle(request);
}
}
}
isService(req: HttpRequest<any>, service: string | string[]): boolean {
if (Array.isArray(service)) {
return !!service.find(element => req.url.indexOf(element) !== -1);
} else {
return req.url.indexOf(service) !== -1;
}
}
// public cleanRequest(requestUrl: string) {
// console.log("cleaned");
// const key: StateKey<string> = makeStateKey<string>(requestUrl);
// this.transferState.remove(key);
// }
}