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import _ from 'underscore';
/**
* Default options for any request
* @type {{credentials: string}}
*/
const OPTIONS = {
method: 'GET',
credentials: 'same-origin'
};
/**
* Default request headers
* @type {{Accept: string}}
*/
const HEADERS = {
'Accept': 'application/json'
};
/**
* Create a query string from an object
* @param {object} parameters
* @returns {string}
*/
function queryString (parameters) {
return Object.keys(parameters)
.map(key => {
return `${encodeURIComponent(key)}=${encodeURIComponent(parameters[key])}`;
})
.join('&');
}
/**
* Request
*/
class Request {
constructor (url) {
this.url = url;
this.options = {};
this.headers = {};
}
submit () {
let url = this.url;
let options = _.defaults(this.options, OPTIONS);
options.headers = _.defaults(this.headers, HEADERS);
if (this.data) {
if (options.method === 'GET') {
url += '?' + queryString(this.data);
} else {
options.headers['Content-Type'] = 'application/x-www-form-urlencoded';
options.body = queryString(this.data);
}
}
return window.fetch(url, options);
}
setMethod (method) {
this.options.method = method;
return this;
}
setData (data) {
this.data = data;
return this;
}
}
/**
* Make a request
* @param {string} url
* @returns {Request}
*/
export function request (url) {
return new Request(url);
}
/**
* Check that response status is ok
* @param response
* @returns {*}
*/
export function checkStatus (response) {
if (response.status >= 200 && response.status < 300) {
return response;
} else {
var error = new Error(response.status);
error.response = response;
throw error;
}
}
/**
* Parse response as JSON
* @param response
* @returns {object}
*/
export function parseJSON (response) {
return response.json();
}
/**
* Shortcut to do a GET request and return response json
* @param url
* @param data
*/
export function getJSON (url, data) {
return request(url)
.setData(data)
.submit()
.then(checkStatus)
.then(parseJSON);
}
/**
* Shortcut to do a POST request and return response json
* @param url
* @param data
*/
export function postJSON (url, data) {
return request(url)
.setMethod('POST')
.setData(data)
.submit()
.then(checkStatus)
.then(parseJSON);
}
/**
* Shortcut to do a POST request and return response json
* @param url
* @param data
*/
export function post (url, data) {
return request(url)
.setMethod('POST')
.setData(data)
.submit()
.then(checkStatus);
}
/**
* Delay promise for testing purposes
* @param response
* @returns {Promise}
*/
export function delay (response) {
return new Promise(resolve => setTimeout(() => resolve(response), 3000));
}
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