Add django-csrf.js to support csrf protected POST requests.

Author: gregmuellegger

media/javascript/django-csrf.js

@@ -0,0 +1,31 @@
+(function () {
+    function csrfSafeMethod(method) {
+        // these HTTP methods do not require CSRF protection
+        return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
+    }
+
+    $.ajaxSetup({
+        beforeSend: function(xhr, settings) {
+            if (!csrfSafeMethod(settings.type) && !this.crossDomain) {
+                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');
+
+                xhr.setRequestHeader("X-CSRFToken", csrftoken);
+            }
+        }
+    });
+})();