From 7f043f588b651afc95da91faae2043b02b2fa6b9 Mon Sep 17 00:00:00 2001
From: Mathijs de Bruin <mathijs@mathijsfietst.nl>
Date: Wed, 4 Sep 2013 21:57:04 +0200
Subject: [PATCH] Added jQuery tool for doing proper CSRF with AJAX.

---
 README.md                                     |  1 +
 .../adminsortable/js/jquery.django-csrf.js    | 32 +++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 adminsortable/static/adminsortable/js/jquery.django-csrf.js

diff --git a/README.md b/README.md
index 2fd4286..4da2d97 100644
--- a/README.md
+++ b/README.md
@@ -223,6 +223,7 @@ Example:
             js = (
                     '//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js',
                     '//ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.js',
+                    'adminsortable/js/jquery.django-csrf.js',
                     # 'adminsortable/js/admin.sortable.stacked.inlines.js',
                     'adminsortable/js/admin.sortable.tabular.inlines.js',
                 )
diff --git a/adminsortable/static/adminsortable/js/jquery.django-csrf.js b/adminsortable/static/adminsortable/js/jquery.django-csrf.js
new file mode 100644
index 0000000..277c18e
--- /dev/null
+++ b/adminsortable/static/adminsortable/js/jquery.django-csrf.js
@@ -0,0 +1,32 @@
+// using jQuery
+function getCookie(name) {
+    var cookieValue = null;
+    if (document.cookie && document.cookie !== '') {
+        var cookies = document.cookie.split(';');
+        for (var i = 0; i < cookies.length; i++) {
+            var cookie = jQuery.trim(cookies[i]);
+            // Does this cookie string begin with the name we want?
+            if (cookie.substring(0, name.length + 1) == (name + '=')) {
+                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
+                break;
+            }
+        }
+    }
+    return cookieValue;
+}
+
+var csrftoken = getCookie('csrftoken');
+
+function csrfSafeMethod(method) {
+    // these HTTP methods do not require CSRF protection
+    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
+}
+
+$.ajaxSetup({
+    crossDomain: false, // obviates need for sameOrigin test
+    beforeSend: function(xhr, settings) {
+        if (!csrfSafeMethod(settings.type)) {
+            xhr.setRequestHeader("X-CSRFToken", csrftoken);
+        }
+    }
+});