react-native-spotify-web-api/src/http-manager.js

A React Native wrapper for Spotify's Web API

'use strict';

var superagent = require('superagent'),
    WebApiError = require('./webapi-error');

var HttpManager = {};

/* Create superagent options from the base request */
var _getParametersFromRequest = function(request) {

  var options = {};

  if (request.getQueryParameters()) {
    options.query = request.getQueryParameters();
  }

  if (request.getHeaders() &&
      request.getHeaders()['Content-Type'] === 'application/json') {
    options.data = JSON.stringify(request.getBodyParameters());
  } else if (request.getBodyParameters()) {
    options.data = request.getBodyParameters();
  }

  if (request.getHeaders()) {
    options.headers = request.getHeaders();
  }
  return options;
};

/* Create an error object from an error returned from the Web API */
var _getErrorObject = function(defaultMessage, err) {
  var errorObject;
  if (typeof err.error === 'object' && typeof err.error.message === 'string') {
    // Web API Error format
    errorObject = new WebApiError(err.error.message, err.error.status);
  } else if (typeof err.error === 'string') {
    // Authorization Error format
    /* jshint ignore:start */
    errorObject = new WebApiError(err.error + ': ' + err['error_description']);
    /* jshint ignore:end */
  } else if (typeof err === 'string') {
    // Serialized JSON error
    try {
      var parsedError = JSON.parse(err);
      errorObject = new WebApiError(parsedError.error.message, parsedError.error.status);
    } catch (err) {
      // Error not JSON formatted
    }
  }

  if(!errorObject) {
    // Unexpected format
    errorObject = new WebApiError(defaultMessage + ': ' + JSON.stringify(err));
  }

  return errorObject;
};

/* Make the request to the Web API */
HttpManager._makeRequest = function(method, options, uri, callback) {
  var req = method(uri);

  if (options.query) {
    req.query(options.query);
  }

  if (options.data && (!options.headers || options.headers['Content-Type'] !== 'application/json')) {
    req.type('form');
    req.send(options.data);
  } else if (options.data) {
    req.send(options.data);
  }

  if (options.headers) {
    req.set(options.headers);
  }

  req.end(function (err, response) {
    if (err) {
      var errorObject = _getErrorObject('Request error', {
        error: err
      });
      return callback(errorObject);
    }

    return callback(null, {
      body: response.body,
      headers: response.headers,
      statusCode: response.statusCode
    });
  });
};

/**
 * Make a HTTP GET request.
 * @param {BaseRequest} The request.
 * @param {Function} The callback function.
 */
HttpManager.get = function(request, callback) {
  var options = _getParametersFromRequest(request);
  var method = superagent.get;

  HttpManager._makeRequest(method, options, request.getURI(), callback);
};

/**
 * Make a HTTP POST request.
 * @param {BaseRequest} The request.
 * @param {Function} The callback function.
 */
HttpManager.post = function(request, callback) {

  var options = _getParametersFromRequest(request);
  var method = superagent.post;

  HttpManager._makeRequest(method, options, request.getURI(), callback);
};

/**
 * Make a HTTP DELETE request.
 * @param {BaseRequest} The request.
 * @param {Function} The callback function.
 */
HttpManager.del = function(request, callback) {

  var options = _getParametersFromRequest(request);
  var method = superagent.del;

  HttpManager._makeRequest(method, options, request.getURI(), callback);
};

/**
 * Make a HTTP PUT request.
 * @param {BaseRequest} The request.
 * @param {Function} The callback function.
 */
HttpManager.put = function(request, callback) {

  var options = _getParametersFromRequest(request);
  var method = superagent.put;

  HttpManager._makeRequest(method, options, request.getURI(), callback);
};

module.exports = HttpManager;