Disable pasting base64 images in ckeditor

.jshintignore

@@ -14,6 +14,7 @@ www/common/hyperscript.js
 www/pad/wysiwygarea-plugin.js
 www/pad/mediatag-plugin.js
 www/pad/mediatag-plugin-dialog.js
+www/pad/disable-base64.js
 
 www/kanban/jkanban.js
 

www/pad/disable-base64.js

@@ -0,0 +1,40 @@
+( function() {
+    CKEDITOR.plugins.add('blockbase64', {
+        init: function (editor) {
+
+            var replaceImgText = function (html) {
+                var ret = html.replace( /<img[^>]*src="data:image\/(bmp|dds|gif|jpg|jpeg|png|psd|pspimage|tga|thm|tif|tiff|yuv|ai|eps|ps|svg);base64,.*?"[^>]*>/gi,
+                    function () {
+                        console.error("Direct image paste is not allowed.");
+                        return '';
+                });
+                return ret;
+            };
+
+            var chkImg = function () {
+                // don't execute code if the editor is readOnly
+                if (editor.readOnly) {
+                    return;
+                }
+
+                setTimeout( function() {
+                    editor.document.$.body.innerHTML = replaceImgText(editor.document.$.body.innerHTML);
+                },100);
+            };
+
+            editor.on('contentDom', function () {
+                // For Firefox
+                editor.document.on('drop', chkImg);
+                // For IE
+                editor.document.getBody().on('drop', chkImg);
+            });
+
+            editor.on('paste', function(e) {
+                var html = e.data.dataValue;
+                if (!html) { return; }
+                e.data.dataValue = replaceImgText(html);
+            });
+
+        }
+    });
+})();

www/pad/inner.js

@@ -740,6 +740,7 @@ define([
                     '.cke_body_width body > *:first-child { margin-top: 0; }';
                 Ckeditor.addCss(newCss);
                 Ckeditor.plugins.addExternal('mediatag','/pad/', 'mediatag-plugin.js');
+                Ckeditor.plugins.addExternal('blockbase64','/pad/', 'disable-base64.js');
                 module.ckeditor = editor = Ckeditor.replace('editor1', {
                     customConfig: '/customize/ckeditor-config.js',
                 });

www/pad/mediatag-plugin.js

@@ -1,12 +1,3 @@
-/**
- * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or http://ckeditor.com/license
- */
-
-/**
- * @fileOverview The Image plugin.
- */
-
 ( function() {
 
     CKEDITOR.plugins.add( 'mediatag', {