opt-cc/static/src/app/services/http-gateway.ts

import {Injectable} from '@angular/core';
import {Router} from '@angular/router';
import {CookieService} from 'ngx-cookie-service';
import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http';
import {Observable} from 'rxjs';

export type HttpMethod = 'GET' | 'POST' | 'PUT' | 'PATCH'

@Injectable()
export class HttpGateway {

  constructor(private router: Router,
              private http: HttpClient,
              private cookieService: CookieService) {
  }

  createAuthorizationHeader() {
    const cookieField = this.cookieService.get('currentUser');
    if (cookieField) {
      const currentUser = JSON.parse(cookieField);
      if (new Date().getTime() <= Date.parse(currentUser.tokenExpireDate)) {
        return {
          headers: new HttpHeaders({
            'x-access-token': currentUser.token
          })
        };
      } else {
        // logout
        localStorage.removeItem('currentUser');
        this.router.navigate(['/login']);
      }
    } else {
      return {};
    }
  }

  get<T>(url: string, searchParams?: HttpParams, getFullResponse = false): Observable<T> {
    const options = this.createAuthorizationHeader();

    if (searchParams) {
      options['params'] = searchParams;
    }
    if (getFullResponse) {
      options['observe'] = 'response';
    }

    return this.http.get<T>(url, options);
  }

  post<T>(url, data): Observable<T> {
    return this.http.post<T>(url, data, this.createAuthorizationHeader());
  }

  put<T>(url, data): Observable<T> {
    return this.http.put<T>(url, data, this.createAuthorizationHeader());
  }

  patch<T>(url, data): Observable<T> {
    return this.http.patch<T>(url, data, this.createAuthorizationHeader());
  }

  delete(url) {
    return this.http.delete(url, this.createAuthorizationHeader());
  }

  request<T>(requestUrl, body, method: HttpMethod): Observable<T> {
    switch (method) {
      case 'GET':
        return this.get(requestUrl);
      case 'POST':
        return this.post<T>(requestUrl, body);
      case 'PUT':
        return this.put(requestUrl, body);
      case 'PATCH':
        return this.patch<T>(requestUrl, body);
    }
  }
}