Loopback Models ES6

gistfile1.txt

import request from 'request-promise';

var token    = process.env.SBIF_TOKEN_URL,
    api_url  =  process.env.SBIF_API_URL;

class SbifApi{
  constructor(SbifModel){
    //map remote methods to class methods. Set an extra this using the .bind function
    SbifModel.uf = this.getData.bind(SbifModel, 'uf');
    SbifModel.utm = this.getData.bind(SbifModel, 'utm');
    SbifModel.ipc = this.getData.bind(SbifModel, 'ipc');
    SbifModel.dolar = this.getData.bind(SbifModel, 'dolar');
    SbifModel.euro = this.getData.bind(SbifModel, 'euro');

    //Set remotes
    this.setRemotes(SbifModel, {name: 'uf', path: '/uf', root: 'uf'});
    this.setRemotes(SbifModel, {name: 'utm', path: '/utm', root: 'utm'});
    this.setRemotes(SbifModel, {name: 'ipc', path: '/ipc', root: 'ipc'});
    this.setRemotes(SbifModel, {name: 'dolar', path: '/dolar', root: 'dolar'});
    this.setRemotes(SbifModel, {name: 'euro', path: '/euro', root: 'euro'});

    return SbifModel;
  }
  setRemotes(model, remoteMethod){
    let remoteOpts = {
      accepts: {
        arg: 'params', 
        type: 'string'
      },
      returns: {
        arg: remoteMethod.root || remoteMethod.name,
        type: 'string'
      },
      http: {
        path: remoteMethod.path || '/' + remoteMethod.name, 
        verb: 'get' 
      }
    };
    //Set the model remote methodnpm
    model.remoteMethod(remoteMethod.name, remoteOpts);
  }
  getData(type, params, callback){
    request(`${api_url}/${type}?apikey=${token}&formato=json`).then((res) => {
      
      let data = JSON.parse(res);
      
      switch(type){
        case 'uf': 
          data = data.UFs[0]; 
          break;
        case 'utm': 
          data = data.UTMs[0]; 
          break;
        case 'ipc': 
          data = data.IPCs[0]; 
          break;
        case 'dolar': 
          data = data.Dolares[0]; 
          break;
        case 'euro': 
          data = data.Euros[0]; 
          break;
      }
      callback(null, data);
    });
  }
}
module.exports = (Model) => { new SbifApi(Model) }