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

import {Injectable} from '@angular/core';
import {Headers, Http, RequestMethod} from '@angular/http';
import {Router} from '@angular/router';
import {CookieService} from 'ngx-cookie-service';

@Injectable()
export class HttpGateway {

  constructor(private router: Router,
              private http: Http,
              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)) {
        const headers = new Headers();
        headers.append('x-access-token', currentUser.token);
        return headers;
      } else {
        // logout
        localStorage.removeItem('currentUser');
        this.router.navigate(['/login']);
      }
    }
  }

  get(url, searchParams?) {
    const headers = this.createAuthorizationHeader();
    const options: any = {headers: headers};
    if (searchParams) {
      options.search = searchParams;
    }
    return this.http.get(url, options);
  }

  post(url, data) {
    const headers = this.createAuthorizationHeader();
    return this.http.post(url, data, {
      headers: headers
    });
  }

  put(url, data) {
    const headers = this.createAuthorizationHeader();
    return this.http.put(url, data, {
      headers: headers
    });
  }

  patch(url, data) {
    const headers = this.createAuthorizationHeader();
    return this.http.patch(url, data, {
      headers: headers
    });
  }

  delete(url) {
    const headers = this.createAuthorizationHeader();
    return this.http.delete(url, {
      headers: headers
    });
  }

  request(requestUrl, options) {
    if (options.method === RequestMethod.Post) {
      return this.post(requestUrl, options.body);
    }
    if (options.method === RequestMethod.Patch) {
      return this.patch(requestUrl, options.body);
    }
  }
}