api.service.ts

//
// ApiService
// Felype Rennan / 2017
// usage Example:
// try {
//     var values = await this.api.get('api/Values');
// } catch(err) {
//     // handle some err
// }

import { Injectable } from '@angular/core';
import { Http, Request, Response, RequestOptionsArgs, Headers, BaseRequestOptions, RequestOptions } from '@angular/http'

import { environment } from '../environments/environment';

import 'rxjs/Rx';
import { Router } from '@angular/router';

@Injectable()
export class ApiService {

  constructor(private http: Http) { 
    
  }

  private mapUrl(url: string) {

    if(!url.startsWith('/')) {
      url = '/' + url;
    }

    var prodUrl = '';
    
    // TODO: Set Development Base API uri here
    var devUrl = 'http://localhost:5000';
    var apiUrl = '';

    if(environment.production) {
      apiUrl = prodUrl;
    } else {
      apiUrl = devUrl;
    }

    url = apiUrl + url;

    return url;
  }

  async get(api:string) {
    return await this.chamarApi(api, null, 'GET');
  }
  async post(api:string, postData:any) {
    return await this.chamarApi(api, postData, 'POST');
  }

  private async chamarApi(api:string, postData:Object, method:string) : Promise<any> {
    var access_token = localStorage.getItem('access_token');
    
    var options:RequestOptionsArgs = {
      url: this.mapUrl(api),
      headers: new Headers({
        'Authentication': 'bearer '+access_token,
      })
    };

    options.method = method;
    if(postData) {
      options.body = postData;
    } else {
      options.body = null;
      postData = null;
    }

    var retv = this.http.request(this.mapUrl(api), options)
      .toPromise()
      .catch((err) => {
        throw JSON.parse(err._body);
      })
      .then((data:any) => {
        return JSON.parse(data._body);
      });
    return retv;
  }

}