[PATCH v2 2/3] static: add JS Cookie library to get csrftoken for client-side requests

[Raxel Gutierrez]

Currently in Patchwork, requests are made only through older methods via
form submissions, which means the UI is rendered strictly server-side.
This lags behind more modern and versatile approaches that use
JavaScript to send requests and dynamically update the UI based on the
respective responses.

In order to make REST API requests on the client-side secure from CSRF
attacks, add the JS Cookie library which allows the CSRF token to be
passed in the request header. A following patch that introduces the
`rest.js` module will make use of the JS Cookie library in this patch.

The library is a recommendation from Django docs [1]. The files for the
library can be downloaded in the releases page of the GitHub [2].

[1] https://docs.djangoproject.com/en/3.2/ref/csrf/#ajax
[2] https://github.com/js-cookie/js-cookie/releases

Signed-off-by: Raxel Gutierrez <raxel at google.com>
Reviewed-by: Daniel Axtens <dja at axtens.net>
---
 htdocs/README.rst          | 9 +++++++++
 htdocs/js/js.cookie.min.js | 2 ++
 templates/base.html        | 1 +
 3 files changed, 12 insertions(+)
 create mode 100644 htdocs/js/js.cookie.min.js

diff --git a/htdocs/README.rst b/htdocs/README.rst
index 62f15c23..128dc7c2 100644
--- a/htdocs/README.rst
+++ b/htdocs/README.rst
@@ -122,6 +122,15 @@ js
   :GitHub: jQuery plug-in to drag and drop rows in HTML tables
   :Version: ???
 
+``js.cookie.min.js``
+
+  Library used to handle cookies.
+
+  This is used to get the ``csrftoken`` cookie for AJAX requests in JavaScript.
+
+  :GitHub: https://github.com/js-cookie/js-cookie/
+  :Version: 3.0.0
+
 ``selectize.min.js``
 
   Selectize is the hybrid of a ``textbox`` and ``<select>`` box. It's jQuery
diff --git a/htdocs/js/js.cookie.min.js b/htdocs/js/js.cookie.min.js
new file mode 100644
index 00000000..63fc3ef9
--- /dev/null
+++ b/htdocs/js/js.cookie.min.js
@@ -0,0 +1,2 @@
+/*! js-cookie v3.0.0 | MIT */
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self,function(){var n=e.Cookies,r=e.Cookies=t();r.noConflict=function(){return e.Cookies=n,r}}())}(this,(function(){"use strict";function e(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)e[r]=n[r]}return e}var t={read:function(e){return e.replace(/(%[\dA-F]{2})+/gi,decodeURIComponent)},write:function(e){return encodeURIComponent(e).replace(/%(2[346BF]|3[AC-F]|40|5[BDE]|60|7[BCD])/g,decodeURIComponent)}};return function n(r,o){function i(t,n,i){if("undefined"!=typeof document){"number"==typeof(i=e({},o,i)).expires&&(i.expires=new Date(Date.now()+864e5*i.expires)),i.expires&&(i.expires=i.expires.toUTCString()),t=encodeURIComponent(t).replace(/%(2[346B]|5E|60|7C)/g,decodeURIComponent).replace(/[()]/g,escape),n=r.write(n,t);var c="";for(var u in i)i[u]&&(c+="; "+u,!0!==i[u]&&(c+="="+i[u].split(";")[0]));return document.cookie=t+"="+n+c}}return Object.create({set:i,get:function(e){if("undefined"!=typeof document&&(!arguments.length||e)){for(var n=document.cookie?document.cookie.split("; "):[],o={},i=0;i<n.length;i++){var c=n[i].split("="),u=c.slice(1).join("=");'"'===u[0]&&(u=u.slice(1,-1));try{var f=t.read(c[0]);if(o[f]=r.read(u,f),e===f)break}catch(e){}}return e?o[e]:o}},remove:function(t,n){i(t,"",e({},n,{expires:-1}))},withAttributes:function(t){return n(this.converter,e({},this.attributes,t))},withConverter:function(t){return n(e({},this.converter,t),this.attributes)}},{attributes:{value:Object.freeze(o)},converter:{value:Object.freeze(r)}})}(t,{path:"/"})}));
diff --git a/templates/base.html b/templates/base.html
index 3a0825ac..44f26d73 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -21,6 +21,7 @@
   <script src="{% static "js/bootstrap.min.js" %}"></script>
   <script src="{% static "js/selectize.min.js" %}"></script>
   <script src="{% static "js/clipboard.min.js" %}"></script>
+  <script src="{% static "js/js.cookie.min.js" %}"></script>
   <script>
    $(document).ready(function() {
        new Clipboard(document.querySelectorAll('button.btn-copy'));
-- 
2.33.0.rc1.237.g0d66db33f3-goog