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jsonrpc.js
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jsonrpc.js
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/*
* Minimal JSON RPC 2.0 Client Library for Javascript, (C) 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the 'License');
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an 'AS IS' BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
function error(msg) {
console.log(backtrace());
throw new Error(msg);
}
function backtrace() {
try {
throw new Error();
} catch (e) {
return e.stack ? e.stack.split('\n').slice(2).join('\n') : '';
}
}
// Validates if URL is safe and allowed, e.g. to avoid XSS.
function isValidUrl(url, allowRelative) {
if (!url) {
return false;
}
// RFC 3986 (http://tools.ietf.org/html/rfc3986#section-3.1)
// scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
var protocol = /^[a-z][a-z0-9+\-.]*(?=:)/i.exec(url);
if (!protocol) {
return allowRelative;
}
protocol = protocol[0].toLowerCase();
switch (protocol) {
case 'http':
case 'https':
return true;
default:
return false;
}
}
(function (global, factory) {
if (typeof define === 'function' && define.amd) {
define([], factory);
} else if (typeof module !== 'undefined' && module.exports){
module.exports = factory();
} else {
global.JsonRPCRequest = factory();
}
})(this, function () {
function JsonRPCRequest(params) {
var settings = {
version: '2.0',
}
if (!params) {
error('Invalid params');
}
// allow relative url
if (!isValidUrl(params.endpoint, true)) {
error('Invalid url');
}
// Overwrite and define settings with options if they exist.
for (var key in settings) {
this[key] = settings[key];
}
for (var key in params) {
this[key] = params[key];
}
var self = this;
function _doRequest(data, cb) {
var xmlhttp = new XMLHttpRequest(),
method = 'POST',
url = self.endpoint;
xmlhttp.open(method, url, true);
xmlhttp.setRequestHeader('Content-Type', 'application/json');
xmlhttp.onreadystatechange = function() {
if (4 !== xmlhttp.readyState) {
return;
}
if (200 !== xmlhttp.status) {
if (400 === xmlhttp.status) {
cb(JSON.parse(xmlhttp.responseText), null);
return;
}
if (404 === xmlhttp.status) {
cb({error: 'Endpoint url not found', version: '2.0'}, null);
return;
}
cb({error: 'Unknown internal server error', version: '2.0'}, null);
return;
}
cb(null, JSON.parse(xmlhttp.responseText));
}
xmlhttp.send(data);
}
this.call = function (method, options, cb) {
if (!options) {
options = { id: 1};
}
if (!options.id) {
options.id = 1;
}
var dataObj = {
jsonrpc: self.version,
method: self.namespace ? self.namespace +'.'+ method : method,
params: options.params ? options.params : [],
id: options.id
}
var jsonData = JSON.stringify(dataObj);
_doRequest(jsonData, cb)
}
}
return JsonRPCRequest;
});