pigallery2/frontend/app/model/network/network.service.ts

import {Injectable} from "@angular/core";
import {Headers, Http, RequestOptions} from "@angular/http";
import {Message} from "../../../../common/entities/Message";
import "rxjs/Rx";

@Injectable()
export class NetworkService {

  _baseUrl = "/api";

  constructor(protected _http: Http) {
  }

  private callJson<T>(method: string, url: string, data: any = {}): Promise<T> {
    let body = JSON.stringify(data);
    let headers = new Headers({'Content-Type': 'application/json'});
    let options = new RequestOptions({headers: headers});

    if (method == "get" || method == "delete") {
      return <any>this._http[method](this._baseUrl + url, options)
        .toPromise()
        .then(res => <Message<any>> res.json())
        .catch(NetworkService.handleError);
    }

    return this._http[method](this._baseUrl + url, body, options)
      .toPromise()
      .then((res: any) => <Message<any>> res.json())
      .catch(NetworkService.handleError);
  }

  public postJson<T>(url: string, data: any = {}): Promise<T> {
    return this.callJson("post", url, data);
  }

  public putJson<T>(url: string, data: any = {}): Promise<T> {
    return this.callJson("put", url, data);
  }

  public getJson<T>(url: string): Promise<T> {
    return this.callJson("get", url);
  }


  public deleteJson<T>(url: string): Promise<T> {
    return this.callJson("delete", url);
  }

  private static handleError(error: any) {
    // TODO: in a real world app do smthing better
    // instead of just logging it to the console
    console.error(error);
    return Promise.reject(error.message || error.json().error || 'Server error');
  }
}