https://dposs.ru/static/js/csrf.js

1/**
2 * Created by Mike on 19.04.14.
3 */
4// using jQuery
5function getCookie(name) {
6    var cookieValue = null;
7    if (document.cookie && document.cookie != '') {
8        var cookies = document.cookie.split(';');
9        for (var i = 0; i < cookies.length; i++) {
10            var cookie = jQuery.trim(cookies[i]);
11            // Does this cookie string begin with the name we want?
12            if (cookie.substring(0, name.length + 1) == (name + '=')) {
13                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
14                break;
15            }
16        }
17    }
18    return cookieValue;
19}
20
21var csrftoken = getCookie('csrftoken');
22
23function csrfSafeMethod(method) {
24    // these HTTP methods do not require CSRF protection
25    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
26}
27function sameOrigin(url) {
28    // test that a given url is a same-origin URL
29    // url could be relative or scheme relative or absolute
30    var host = document.location.host; // host + port
31    var protocol = document.location.protocol;
32    var sr_origin = '//' + host;
33    var origin = protocol + sr_origin;
34    // Allow absolute or scheme relative URLs to same origin
35    return (url == origin || url.slice(0, origin.length + 1) == origin + '/') ||
36        (url == sr_origin || url.slice(0, sr_origin.length + 1) == sr_origin + '/') ||
37        // or any other URL that isn't scheme relative or absolute i.e relative.
38        !(/^(\/\/|http:|https:).*/.test(url));
39}
40$.ajaxSetup({
41    beforeSend: function(xhr, settings) {
42        if (!csrfSafeMethod(settings.type) && sameOrigin(settings.url)) {
43            // Send the token to same-origin, relative URLs only.
44            // Send the token only if the method warrants CSRF protection
45            // Using the CSRFToken value acquired earlier
46            xhr.setRequestHeader("X-CSRFToken", csrftoken);
47        }
48    }
49});