Move dropzone.js to npm/webpack (#10645)

- unvendor dropzone and upgrade it from 4.2.0 to 5.7.0
- make `csrf` available on window.config

package-lock.json

         }
       }
     },
+    "dropzone": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/dropzone/-/dropzone-5.7.0.tgz",
+      "integrity": "sha512-kOltiZXH5cO/72I22JjE+w6BoT6uaVLfWdFMsi1PMKFkU6BZWpqRwjnsRm0o6ANGTBuZar5Piu7m/CbKqRPiYg=="
+    },
     "duplexer2": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.0.2.tgz",

package.json

   "dependencies": {
     "@primer/octicons": "9.4.0",
     "clipboard": "2.0.4",
+    "dropzone": "5.7.0",
     "fomantic-ui": "2.8.4",
     "highlight.js": "9.18.1",
     "jquery": "3.4.1",

public/vendor/librejs.html

           <td><a href="https://github.com/Ranks/emojify.js/archive/1.1.0.tar.gz">emojify-1.1.0.tar.gz</a></td>
         </tr>
         <tr>
-          <td><a href="./plugins/dropzone/dropzone.js">dropzone.js</a></td>
-          <td><a href="https://github.com/enyo/dropzone/blob/master/LICENSE">Expat</a></td>
-          <td><a href="https://github.com/enyo/dropzone/archive/v4.2.0.tar.gz">dropzone.js-4.2.0.tar.gz</a></td>
+          <td><a href="./js/dropzone.js">dropzone.js</a></td>
+          <td><a href="https://github.com/enyo/dropzone/blob/master/LICENSE">MIT</a></td>
+          <td><a href="https://github.com/enyo/dropzone/archive/master.tar.gz">dropzone-master.tar.gz</a></td>
         </tr>
         <tr>
           <td><a href="./highlight.js">highlight.js</a></td>

public/vendor/plugins/dropzone/LICENSE

-(c) Copyright 2012 Matias Meno
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

public/vendor/plugins/dropzone/dropzone.css

-/*
- * The MIT License
- * Copyright (c) 2012 Matias Meno <m@tias.me>
- */
-@-webkit-keyframes passing-through {
-  0% {
-    opacity: 0;
-    -webkit-transform: translateY(40px);
-    -moz-transform: translateY(40px);
-    -ms-transform: translateY(40px);
-    -o-transform: translateY(40px);
-    transform: translateY(40px); }
-  30%, 70% {
-    opacity: 1;
-    -webkit-transform: translateY(0px);
-    -moz-transform: translateY(0px);
-    -ms-transform: translateY(0px);
-    -o-transform: translateY(0px);
-    transform: translateY(0px); }
-  100% {
-    opacity: 0;
-    -webkit-transform: translateY(-40px);
-    -moz-transform: translateY(-40px);
-    -ms-transform: translateY(-40px);
-    -o-transform: translateY(-40px);
-    transform: translateY(-40px); } }
-@-moz-keyframes passing-through {
-  0% {
-    opacity: 0;
-    -webkit-transform: translateY(40px);
-    -moz-transform: translateY(40px);
-    -ms-transform: translateY(40px);
-    -o-transform: translateY(40px);
-    transform: translateY(40px); }
-  30%, 70% {
-    opacity: 1;
-    -webkit-transform: translateY(0px);
-    -moz-transform: translateY(0px);
-    -ms-transform: translateY(0px);
-    -o-transform: translateY(0px);
-    transform: translateY(0px); }
-  100% {
-    opacity: 0;
-    -webkit-transform: translateY(-40px);
-    -moz-transform: translateY(-40px);
-    -ms-transform: translateY(-40px);
-    -o-transform: translateY(-40px);
-    transform: translateY(-40px); } }
-@keyframes passing-through {
-  0% {
-    opacity: 0;
-    -webkit-transform: translateY(40px);
-    -moz-transform: translateY(40px);
-    -ms-transform: translateY(40px);
-    -o-transform: translateY(40px);
-    transform: translateY(40px); }
-  30%, 70% {
-    opacity: 1;
-    -webkit-transform: translateY(0px);
-    -moz-transform: translateY(0px);
-    -ms-transform: translateY(0px);
-    -o-transform: translateY(0px);
-    transform: translateY(0px); }
-  100% {
-    opacity: 0;
-    -webkit-transform: translateY(-40px);
-    -moz-transform: translateY(-40px);
-    -ms-transform: translateY(-40px);
-    -o-transform: translateY(-40px);
-    transform: translateY(-40px); } }
-@-webkit-keyframes slide-in {
-  0% {
-    opacity: 0;
-    -webkit-transform: translateY(40px);
-    -moz-transform: translateY(40px);
-    -ms-transform: translateY(40px);
-    -o-transform: translateY(40px);
-    transform: translateY(40px); }
-  30% {
-    opacity: 1;
-    -webkit-transform: translateY(0px);
-    -moz-transform: translateY(0px);
-    -ms-transform: translateY(0px);
-    -o-transform: translateY(0px);
-    transform: translateY(0px); } }
-@-moz-keyframes slide-in {
-  0% {
-    opacity: 0;
-    -webkit-transform: translateY(40px);
-    -moz-transform: translateY(40px);
-    -ms-transform: translateY(40px);
-    -o-transform: translateY(40px);
-    transform: translateY(40px); }
-  30% {
-    opacity: 1;
-    -webkit-transform: translateY(0px);
-    -moz-transform: translateY(0px);
-    -ms-transform: translateY(0px);
-    -o-transform: translateY(0px);
-    transform: translateY(0px); } }
-@keyframes slide-in {
-  0% {
-    opacity: 0;
-    -webkit-transform: translateY(40px);
-    -moz-transform: translateY(40px);
-    -ms-transform: translateY(40px);
-    -o-transform: translateY(40px);
-    transform: translateY(40px); }
-  30% {
-    opacity: 1;
-    -webkit-transform: translateY(0px);
-    -moz-transform: translateY(0px);
-    -ms-transform: translateY(0px);
-    -o-transform: translateY(0px);
-    transform: translateY(0px); } }
-@-webkit-keyframes pulse {
-  0% {
-    -webkit-transform: scale(1);
-    -moz-transform: scale(1);
-    -ms-transform: scale(1);
-    -o-transform: scale(1);
-    transform: scale(1); }
-  10% {
-    -webkit-transform: scale(1.1);
-    -moz-transform: scale(1.1);
-    -ms-transform: scale(1.1);
-    -o-transform: scale(1.1);
-    transform: scale(1.1); }
-  20% {
-    -webkit-transform: scale(1);
-    -moz-transform: scale(1);
-    -ms-transform: scale(1);
-    -o-transform: scale(1);
-    transform: scale(1); } }
-@-moz-keyframes pulse {
-  0% {
-    -webkit-transform: scale(1);
-    -moz-transform: scale(1);
-    -ms-transform: scale(1);
-    -o-transform: scale(1);
-    transform: scale(1); }
-  10% {
-    -webkit-transform: scale(1.1);
-    -moz-transform: scale(1.1);
-    -ms-transform: scale(1.1);
-    -o-transform: scale(1.1);
-    transform: scale(1.1); }
-  20% {
-    -webkit-transform: scale(1);
-    -moz-transform: scale(1);
-    -ms-transform: scale(1);
-    -o-transform: scale(1);
-    transform: scale(1); } }
-@keyframes pulse {
-  0% {
-    -webkit-transform: scale(1);
-    -moz-transform: scale(1);
-    -ms-transform: scale(1);
-    -o-transform: scale(1);
-    transform: scale(1); }
-  10% {
-    -webkit-transform: scale(1.1);
-    -moz-transform: scale(1.1);
-    -ms-transform: scale(1.1);
-    -o-transform: scale(1.1);
-    transform: scale(1.1); }
-  20% {
-    -webkit-transform: scale(1);
-    -moz-transform: scale(1);
-    -ms-transform: scale(1);
-    -o-transform: scale(1);
-    transform: scale(1); } }
-.dropzone, .dropzone * {
-  box-sizing: border-box; }
-
-.dropzone {
-  min-height: 150px;
-  border: 2px solid rgba(0, 0, 0, 0.3);
-  background: white;
-  padding: 20px 20px; }
-  .dropzone.dz-clickable {
-    cursor: pointer; }
-    .dropzone.dz-clickable * {
-      cursor: default; }
-    .dropzone.dz-clickable .dz-message, .dropzone.dz-clickable .dz-message * {
-      cursor: pointer; }
-  .dropzone.dz-started .dz-message {
-    display: none; }
-  .dropzone.dz-drag-hover {
-    border-style: solid; }
-    .dropzone.dz-drag-hover .dz-message {
-      opacity: 0.5; }
-  .dropzone .dz-message {
-    text-align: center;
-    margin: 2em 0; }
-  .dropzone .dz-preview {
-    position: relative;
-    display: inline-block;
-    vertical-align: top;
-    margin: 16px;
-    min-height: 100px; }
-    .dropzone .dz-preview:hover {
-      z-index: 1000; }
-      .dropzone .dz-preview:hover .dz-details {
-        opacity: 1; }
-    .dropzone .dz-preview.dz-file-preview .dz-image {
-      border-radius: 20px;
-      background: #999;
-      background: linear-gradient(to bottom, #eee, #ddd); }
-    .dropzone .dz-preview.dz-file-preview .dz-details {
-      opacity: 1; }
-    .dropzone .dz-preview.dz-image-preview {
-      background: white; }
-      .dropzone .dz-preview.dz-image-preview .dz-details {
-        -webkit-transition: opacity 0.2s linear;
-        -moz-transition: opacity 0.2s linear;
-        -ms-transition: opacity 0.2s linear;
-        -o-transition: opacity 0.2s linear;
-        transition: opacity 0.2s linear; }
-    .dropzone .dz-preview .dz-remove {
-      font-size: 14px;
-      text-align: center;
-      display: block;
-      cursor: pointer;
-      border: none; }
-      .dropzone .dz-preview .dz-remove:hover {
-        text-decoration: underline; }
-    .dropzone .dz-preview:hover .dz-details {
-      opacity: 1; }
-    .dropzone .dz-preview .dz-details {
-      z-index: 20;
-      position: absolute;
-      top: 0;
-      left: 0;
-      opacity: 0;
-      font-size: 13px;
-      min-width: 100%;
-      max-width: 100%;
-      padding: 2em 1em;
-      text-align: center;
-      color: rgba(0, 0, 0, 0.9);
-      line-height: 150%; }
-      .dropzone .dz-preview .dz-details .dz-size {
-        margin-bottom: 1em;
-        font-size: 16px; }
-      .dropzone .dz-preview .dz-details .dz-filename {
-        white-space: nowrap; }
-        .dropzone .dz-preview .dz-details .dz-filename:hover span {
-          border: 1px solid rgba(200, 200, 200, 0.8);
-          background-color: rgba(255, 255, 255, 0.8); }
-        .dropzone .dz-preview .dz-details .dz-filename:not(:hover) {
-          overflow: hidden;
-          text-overflow: ellipsis; }
-          .dropzone .dz-preview .dz-details .dz-filename:not(:hover) span {
-            border: 1px solid transparent; }
-      .dropzone .dz-preview .dz-details .dz-filename span, .dropzone .dz-preview .dz-details .dz-size span {
-        background-color: rgba(255, 255, 255, 0.4);
-        padding: 0 0.4em;
-        border-radius: 3px; }
-    .dropzone .dz-preview:hover .dz-image img {
-      -webkit-transform: scale(1.05, 1.05);
-      -moz-transform: scale(1.05, 1.05);
-      -ms-transform: scale(1.05, 1.05);
-      -o-transform: scale(1.05, 1.05);
-      transform: scale(1.05, 1.05);
-      -webkit-filter: blur(8px);
-      filter: blur(8px); }
-    .dropzone .dz-preview .dz-image {
-      border-radius: 20px;
-      overflow: hidden;
-      width: 120px;
-      height: 120px;
-      position: relative;
-      display: block;
-      z-index: 10; }
-      .dropzone .dz-preview .dz-image img {
-        display: block; }
-    .dropzone .dz-preview.dz-success .dz-success-mark {
-      -webkit-animation: passing-through 3s cubic-bezier(0.77, 0, 0.175, 1);
-      -moz-animation: passing-through 3s cubic-bezier(0.77, 0, 0.175, 1);
-      -ms-animation: passing-through 3s cubic-bezier(0.77, 0, 0.175, 1);
-      -o-animation: passing-through 3s cubic-bezier(0.77, 0, 0.175, 1);
-      animation: passing-through 3s cubic-bezier(0.77, 0, 0.175, 1); }
-    .dropzone .dz-preview.dz-error .dz-error-mark {
-      opacity: 1;
-      -webkit-animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
-      -moz-animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
-      -ms-animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
-      -o-animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
-      animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1); }
-    .dropzone .dz-preview .dz-success-mark, .dropzone .dz-preview .dz-error-mark {
-      pointer-events: none;
-      opacity: 0;
-      z-index: 500;
-      position: absolute;
-      display: block;
-      top: 50%;
-      left: 50%;
-      margin-left: -27px;
-      margin-top: -27px; }
-      .dropzone .dz-preview .dz-success-mark svg, .dropzone .dz-preview .dz-error-mark svg {
-        display: block;
-        width: 54px;
-        height: 54px; }
-    .dropzone .dz-preview.dz-processing .dz-progress {
-      opacity: 1;
-      -webkit-transition: all 0.2s linear;
-      -moz-transition: all 0.2s linear;
-      -ms-transition: all 0.2s linear;
-      -o-transition: all 0.2s linear;
-      transition: all 0.2s linear; }
-    .dropzone .dz-preview.dz-complete .dz-progress {
-      opacity: 0;
-      -webkit-transition: opacity 0.4s ease-in;
-      -moz-transition: opacity 0.4s ease-in;
-      -ms-transition: opacity 0.4s ease-in;
-      -o-transition: opacity 0.4s ease-in;
-      transition: opacity 0.4s ease-in; }
-    .dropzone .dz-preview:not(.dz-processing) .dz-progress {
-      -webkit-animation: pulse 6s ease infinite;
-      -moz-animation: pulse 6s ease infinite;
-      -ms-animation: pulse 6s ease infinite;
-      -o-animation: pulse 6s ease infinite;
-      animation: pulse 6s ease infinite; }
-    .dropzone .dz-preview .dz-progress {
-      opacity: 1;
-      z-index: 1000;
-      pointer-events: none;
-      position: absolute;
-      height: 16px;
-      left: 50%;
-      top: 50%;
-      margin-top: -8px;
-      width: 80px;
-      margin-left: -40px;
-      background: rgba(255, 255, 255, 0.9);
-      -webkit-transform: scale(1);
-      border-radius: 8px;
-      overflow: hidden; }
-      .dropzone .dz-preview .dz-progress .dz-upload {
-        background: #333;
-        background: linear-gradient(to bottom, #666, #444);
-        position: absolute;
-        top: 0;
-        left: 0;
-        bottom: 0;
-        width: 0;
-        -webkit-transition: width 300ms ease-in-out;
-        -moz-transition: width 300ms ease-in-out;
-        -ms-transition: width 300ms ease-in-out;
-        -o-transition: width 300ms ease-in-out;
-        transition: width 300ms ease-in-out; }
-    .dropzone .dz-preview.dz-error .dz-error-message {
-      display: block; }
-    .dropzone .dz-preview.dz-error:hover .dz-error-message {
-      opacity: 1;
-      pointer-events: auto; }
-    .dropzone .dz-preview .dz-error-message {
-      pointer-events: none;
-      z-index: 1000;
-      position: absolute;
-      display: block;
-      display: none;
-      opacity: 0;
-      -webkit-transition: opacity 0.3s ease;
-      -moz-transition: opacity 0.3s ease;
-      -ms-transition: opacity 0.3s ease;
-      -o-transition: opacity 0.3s ease;
-      transition: opacity 0.3s ease;
-      border-radius: 8px;
-      font-size: 13px;
-      top: 130px;
-      left: -10px;
-      width: 140px;
-      background: #be2626;
-      background: linear-gradient(to bottom, #be2626, #a92222);
-      padding: 0.5em 1.2em;
-      color: white; }
-      .dropzone .dz-preview .dz-error-message:after {
-        content: '';
-        position: absolute;
-        top: -6px;
-        left: 64px;
-        width: 0;
-        height: 0;
-        border-left: 6px solid transparent;
-        border-right: 6px solid transparent;
-        border-bottom: 6px solid #be2626; }

routers/repo/attachment.go

 )
 
 func renderAttachmentSettings(ctx *context.Context) {
-	ctx.Data["RequireDropzone"] = true
 	ctx.Data["IsAttachmentEnabled"] = setting.AttachmentEnabled
 	ctx.Data["AttachmentAllowedTypes"] = setting.AttachmentAllowedTypes
 	ctx.Data["AttachmentMaxSize"] = setting.AttachmentMaxSize

routers/repo/editor.go

 }
 
 func renderUploadSettings(ctx *context.Context) {
-	ctx.Data["RequireDropzone"] = true
 	ctx.Data["RequireTribute"] = true
 	ctx.Data["RequireSimpleMDE"] = true
 	ctx.Data["UploadAllowedTypes"] = strings.Join(setting.Repository.Upload.AllowedTypes, ",")

routers/repo/issue.go

 	}
 
 	ctx.Data["RequireHighlightJS"] = true
-	ctx.Data["RequireDropzone"] = true
 	ctx.Data["RequireTribute"] = true
 	ctx.Data["RequireSimpleMDE"] = true
 	renderAttachmentSettings(ctx)

templates/base/footer.tmpl

 {{if .RequireDatetimepicker}}
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.js"></script>
 {{end}}
-{{if .RequireDropzone}}
-	<script src="{{StaticUrlPrefix}}/vendor/plugins/dropzone/dropzone.js"></script>
-{{end}}
 {{if .RequireU2F}}
 	<script src="{{StaticUrlPrefix}}/vendor/plugins/u2f/index.js"></script>
 {{end}}

templates/base/head.tmpl

 		window.config = {
 			AppSubUrl: '{{AppSubUrl}}',
 			StaticUrlPrefix: '{{StaticUrlPrefix}}',
+			csrf: '{{.CsrfToken}}',
 			Datetimepicker: {{if .RequireDatetimepicker}}true{{else}}false{{end}},
-			Dropzone: {{if .RequireDropzone}}true{{else}}false{{end}},
 			HighlightJS: {{if .RequireHighlightJS}}true{{else}}false{{end}},
 			Minicolors: {{if .RequireMinicolors}}true{{else}}false{{end}},
 			SimpleMDE: {{if .RequireSimpleMDE}}true{{else}}false{{end}},
 {{end}}
 {{if .RequireDatetimepicker}}
 	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/jquery.datetimepicker/jquery.datetimepicker.css">
-{{end}}
-{{if .RequireDropzone}}
-	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/dropzone/dropzone.css">
 {{end}}
 	<style class="list-search-style"></style>
 {{if .PageIsUserProfile}}

templates/pwa/serviceworker_js.tmpl

   '{{StaticUrlPrefix}}/js/jquery.js?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/js/swagger.js?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/js/userheatmap.js',
+  '{{StaticUrlPrefix}}/js/dropzone.js',
   '{{StaticUrlPrefix}}/vendor/plugins/codemirror/addon/mode/loadmode.js',
   '{{StaticUrlPrefix}}/vendor/plugins/codemirror/mode/meta.js',
   '{{StaticUrlPrefix}}/vendor/plugins/dropzone/dropzone.js',
   '{{StaticUrlPrefix}}/css/index.css?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/css/swagger.css?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/css/userheatmap.css',
+  '{{StaticUrlPrefix}}/css/dropzone.css',
   '{{StaticUrlPrefix}}/fomantic/semantic.min.css?v={{MD5 AppVer}}',
   '{{StaticUrlPrefix}}/vendor/assets/font-awesome/css/font-awesome.min.css',
   '{{StaticUrlPrefix}}/vendor/plugins/dropzone/dropzone.css',

web_src/js/features/dropzone.js

+export default async function createDropzone(el, opts) {
+  const [{ default: Dropzone }] = await Promise.all([
+    import(/* webpackChunkName: "dropzone" */'dropzone'),
+    import(/* webpackChunkName: "dropzone" */'dropzone/dist/dropzone.css'),
+  ]);
+
+  Dropzone.autoDiscover = false;
+  return new Dropzone(el, opts);
+}

web_src/js/index.js

 import initGitGraph from './features/gitGraph.js';
 import initClipboard from './features/clipboard.js';
 import initUserHeatmap from './features/userHeatmap.js';
+import createDropzone from './features/dropzone.js';
 
 import ActivityTopAuthors from './components/ActivityTopAuthors.vue';
 
-const { AppSubUrl, StaticUrlPrefix } = window.config;
+const { AppSubUrl, StaticUrlPrefix, csrf } = window.config;
 
 function htmlEncode(text) {
   return jQuery('<div />').text(text).html();
 }
 
-let csrf;
 let previewFileModes;
 let simpleMDEditor;
 const commentMDEditors = {};
 let codeMirrorEditor;
 let hljs;
 
-// Disable Dropzone auto-discover because it's manually initialized
-if (typeof (Dropzone) !== 'undefined') {
-  Dropzone.autoDiscover = false;
-}
-
 // Silence fomantic's error logging when tabs are used without a target content element
 $.fn.tab.settings.silent = true;
 
     });
 
     // Edit issue or comment content
-    $('.edit-content').click(function (event) {
+    $('.edit-content').click(async function (event) {
       $(this).closest('.dropdown').find('.menu').toggle('visible');
       const $segment = $(this).closest('.header').next();
       const $editContentZone = $segment.find('.edit-content-zone');
         issuesTribute.attach($textarea.get());
         emojiTribute.attach($textarea.get());
 
+        let dz;
         const $dropzone = $editContentZone.find('.dropzone');
-        $dropzone.data('saved', false);
         const $files = $editContentZone.find('.comment-files');
         if ($dropzone.length > 0) {
+          $dropzone.data('saved', false);
+
           const filenameDict = {};
-          $dropzone.dropzone({
+          dz = await createDropzone($dropzone[0], {
             url: $dropzone.data('upload-url'),
             headers: { 'X-Csrf-Token': csrf },
             maxFiles: $dropzone.data('max-file'),
               });
               this.on('reload', () => {
                 $.getJSON($editContentZone.data('attachment-url'), (data) => {
-                  const drop = $dropzone.get(0).dropzone;
-                  drop.removeAllFiles(true);
+                  dz.removeAllFiles(true);
                   $files.empty();
                   $.each(data, function () {
                     const imgSrc = `${$dropzone.data('upload-url')}/${this.uuid}`;
-                    drop.emit('addedfile', this);
-                    drop.emit('thumbnail', this, imgSrc);
-                    drop.emit('complete', this);
-                    drop.files.push(this);
+                    dz.emit('addedfile', this);
+                    dz.emit('thumbnail', this, imgSrc);
+                    dz.emit('complete', this);
+                    dz.files.push(this);
                     filenameDict[this.name] = {
                       submitted: true,
                       uuid: this.uuid
               });
             }
           });
-          $dropzone.get(0).dropzone.emit('reload');
+          dz.emit('reload');
         }
         // Give new write/preview data-tab name to distinguish from others
         const $editContentForm = $editContentZone.find('.ui.comment.form');
         $editContentZone.find('.cancel.button').click(() => {
           $renderContent.show();
           $editContentZone.hide();
-          $dropzone.get(0).dropzone.emit('reload');
+          dz.emit('reload');
         });
         $editContentZone.find('.save.button').click(() => {
           $renderContent.show();
             } else {
               $content.find('.ui.small.images').html(data.attachments);
             }
-            $dropzone.get(0).dropzone.emit('submit');
-            $dropzone.get(0).dropzone.emit('reload');
+            dz.emit('submit');
+            dz.emit('reload');
           });
         });
       } else {
 }
 
 $(document).ready(async () => {
-  csrf = $('meta[name=_csrf]').attr('content');
-
   // Show exact time
   $('.time-since').each(function () {
     $(this)
   if ($dropzone.length > 0) {
     const filenameDict = {};
 
-    new Dropzone('#dropzone', {
+    await createDropzone('#dropzone', {
       url: $dropzone.data('upload-url'),
       headers: { 'X-Csrf-Token': csrf },
       maxFiles: $dropzone.data('max-file'),