src/app/core/interceptors/error.interceptor.ts

/********************************************************************************
 * Copyright © 2018 Mettenmeier GmbH.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/
import { Injectable, ErrorHandler, Injector } from '@angular/core';
import { HttpErrorResponse } from '@angular/common/http';

import { MessageService } from 'primeng/components/common/messageservice';

import { UtilService } from '@core/services/util.service';
import { ErrorObject } from '@shared/model/ErrorObject';

@Injectable()
export class ErrorInterceptor implements ErrorHandler {

  constructor(
    private injector: Injector
  ) { }


  handleError(httpErrorResponse: HttpErrorResponse) {
    const utilService = this.injector.get(UtilService);
    let errorMessage: ErrorObject[];
    if (Array.isArray(httpErrorResponse.error)) { // should be any kind of validation error
      httpErrorResponse.error.forEach(error => {
        error.httpStatus = httpErrorResponse.status;
      });
      errorMessage = httpErrorResponse.error;
    } else if (httpErrorResponse.error.byteLength !== undefined) { // reports error
      const encodedString = String.fromCharCode.apply(null, new Uint8Array(httpErrorResponse.error));
      const decodedString = decodeURIComponent(escape(encodedString));
      if (decodedString) {
        errorMessage = [JSON.parse(decodedString)];
      }
    } else { // any other error
      errorMessage = [{
        httpStatus: httpErrorResponse.error.httpStatus,
        message: httpErrorResponse.error.message,
        localizedMessage: httpErrorResponse.error.localizedMessage
      }];
      if (errorMessage[0].httpStatus === undefined) {
        errorMessage[0].httpStatus = httpErrorResponse.status;
        errorMessage[0].message = httpErrorResponse.statusText;
        errorMessage[0].localizedMessage = httpErrorResponse.statusText;
      }
    }

    utilService.throwError(errorMessage);
  }
}