| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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"; |
| |
| // Initializes client-side handling of cross-site request forgery (CSRF) |
| // protection by figuring out the custom HTTP headers that need to be sent in |
| // requests and which HTTP methods are ignored because they do not require CSRF |
| // protection. |
| (function() { |
| var restCsrfCustomHeader = null; |
| var restCsrfMethodsToIgnore = null; |
| |
| $.ajax({'url': '/conf', 'dataType': 'xml', 'async': false}).done( |
| function(data) { |
| function getBooleanValue(element) { |
| return ($(element).find('value').text().trim().toLowerCase() === 'true') |
| } |
| |
| function getTrimmedStringValue(element) { |
| return $(element).find('value').text().trim(); |
| } |
| |
| function getTrimmedStringArrayValue(element) { |
| var str = $(element).find('value').text().trim(); |
| var array = []; |
| if (str) { |
| var splitStr = str.split(','); |
| for (var i = 0; i < splitStr.length; i++) { |
| array.push(splitStr[i].trim()); |
| } |
| } |
| return array; |
| } |
| |
| // Get all relevant configuration properties. |
| var $xml = $(data); |
| var csrfEnabled = false; |
| var header = null; |
| var methods = []; |
| $xml.find('property').each(function(idx, element) { |
| var name = $(element).find('name').text(); |
| if (name === 'dfs.webhdfs.rest-csrf.enabled') { |
| csrfEnabled = getBooleanValue(element); |
| } else if (name === 'dfs.webhdfs.rest-csrf.custom-header') { |
| header = getTrimmedStringValue(element); |
| } else if (name === 'dfs.webhdfs.rest-csrf.methods-to-ignore') { |
| methods = getTrimmedStringArrayValue(element); |
| } |
| }); |
| |
| // If enabled, set up all subsequent AJAX calls with a pre-send callback |
| // that adds the custom headers if necessary. |
| if (csrfEnabled) { |
| restCsrfCustomHeader = header; |
| restCsrfMethodsToIgnore = {}; |
| methods.map(function(method) { restCsrfMethodsToIgnore[method] = true; }); |
| $.ajaxSetup({ |
| beforeSend: addRestCsrfCustomHeader |
| }); |
| } |
| }); |
| |
| // Adds custom headers to request if necessary. This is done only for WebHDFS |
| // URLs, and only if it's not an ignored method. |
| function addRestCsrfCustomHeader(xhr, settings) { |
| if (settings.url == null || !settings.url.startsWith('/webhdfs/')) { |
| return; |
| } |
| var method = settings.type; |
| if (restCsrfCustomHeader != null && !restCsrfMethodsToIgnore[method]) { |
| // The value of the header is unimportant. Only its presence matters. |
| xhr.setRequestHeader(restCsrfCustomHeader, '""'); |
| } |
| } |
| })(); |