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http.interceptor.ts
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http.interceptor.ts
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import { Injectable } from '@angular/core';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpHeaders, HttpRequest, HttpResponse } from '@angular/common/http';
import { Observable, throwError, TimeoutError } from 'rxjs';
import { map, catchError, finalize, timeout } from 'rxjs/operators';
import { HttpError } from './http-error';
import { environment } from '../../../environments/environment';
const APP_XHR_TIMEOUT = 30000;
@Injectable()
export class AppInterceptor implements HttpInterceptor {
constructor() {}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
return next
.handle(this.performRequest(req))
.pipe(
timeout(APP_XHR_TIMEOUT),
map((res) => this.handleSuccessfulResponse(res)),
catchError((err) => this.handleErrorResponse(err)),
finalize(this.handleRequestCompleted.bind(this))
);
}
private performRequest(req: HttpRequest<any>): HttpRequest<any> {
let headers: HttpHeaders = req.headers;
headers = headers.set('MyCustomHeaderKey', `MyCustomHeaderValue`);
// headers = headers.set('MyCustomHeaderKey', `MyCustomHeaderValue`);
return req.clone({ url: `${environment.backend.host}/${req.url}`, headers });
}
private handleSuccessfulResponse(event: any): HttpResponse<any> {
// console.log('response at interceptor', event);
if (event instanceof HttpResponse) {
event = event.clone({ body: event.body.response });
}
return event;
}
private handleErrorResponse(errorResponse: any): Observable<HttpEvent<any>> {
// console.log('error at interceptor', errorResponse);
if (errorResponse instanceof TimeoutError) {
return throwError('Timeout Exception');
}
switch (errorResponse.status) {
case 401: // Unauthorized
break;
case 503: // Service Unavailable
break;
case 503: // Internal Server Error
break;
default: // Other Error
}
let customError = new HttpError();
try {
customError = HttpError.initWithCode(errorResponse.error.errors[0].code);
} catch (e) { }
return throwError(customError);
}
private handleRequestCompleted(): void {
// console.log(`Request finished`);
}
}