# All files / src/app/shared/services api-interceptor.service.ts

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78.95% Branches 15/19
100% Functions 7/7
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     import {
      HttpErrorResponse,
      HttpEvent,
      HttpHandler,
      HttpInterceptor,
      HttpRequest
    } from '@angular/common/http';
    import { Injectable } from '@angular/core';
    import { Router } from '@angular/router';

    import * as _ from 'lodash';
    import { Observable, throwError as observableThrowError } from 'rxjs';
    import { catchError } from 'rxjs/operators';

    import { NotificationType } from '../enum/notification-type.enum';
    import { CdNotificationConfig } from '../models/cd-notification';
    import { FinishedTask } from '../models/finished-task';
    import { AuthStorageService } from './auth-storage.service';
    import { NotificationService } from './notification.service';
    import { ServicesModule } from './services.module';

    @Injectable({
      providedIn: ServicesModule
    })
    export class ApiInterceptorService implements HttpInterceptor {
      constructor(
        private router: Router,
        private authStorageService: AuthStorageService,
        public notificationService: NotificationService
      ) {}

      intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        return next.handle(request).pipe(
          catchError((resp) => {
            if (resp instanceof HttpErrorResponse) {
              let timeoutId: number;
              switch (resp.status) {
                case 400:
                  const finishedTask = new FinishedTask();

                  const task = resp.error.task;
                  if (_.isPlainObject(task)) {
                    task.metadata.component = task.metadata.component || resp.error.component;

                    finishedTask.name = task.name;
                    finishedTask.metadata = task.metadata;
                  } else {
                    finishedTask.metadata = resp.error;
                  }

                  finishedTask.success = false;
                  finishedTask.exception = resp.error;
                  timeoutId = this.notificationService.notifyTask(finishedTask);
                  break;
                case 401:
                  this.authStorageService.remove();
                  this.router.navigate(['/login']);
                  break;
                case 403:
                  this.router.navigate(['/403']);
                  break;
                default:
                  timeoutId = this.prepareNotification(resp);
              }

              /**
               * Decorated preventDefault method (in case error previously had
               * preventDefault method defined). If called, it will prevent a
               * notification to be shown.
               */
              resp['preventDefault'] = () => {
                this.notificationService.cancel(timeoutId);
              };

              /**
               * If called, it will prevent a notification for the specific status code.
               * @param {number} status The status code to be ignored.
               */
              resp['ignoreStatusCode'] = function(status: number) {
                if (this.status === status) {
                  this.preventDefault();
                }
              };
            }
            // Return the error to the method that called it.
            return observableThrowError(resp);
          })
        );
      }

      private prepareNotification(resp): number {
        return this.notificationService.show(() => {
          let message = '';
          if (_.isPlainObject(resp.error) && _.isString(resp.error.detail)) {
            message = resp.error.detail; // Error was triggered by the backend.
          } else if (_.isString(resp.error)) {
            message = resp.error;
          } else if (_.isString(resp.message)) {
            message = resp.message;
          }
          return new CdNotificationConfig(
            NotificationType.error,
            `${resp.status} - ${resp.statusText}`,
            message,
            undefined,
            resp['application']
          );
        });
      }
    }