diff --git a/packages/ui-default/components/dialog/index.js b/packages/ui-default/components/dialog/index.js
index ea9d84581..889dbbe9d 100644
--- a/packages/ui-default/components/dialog/index.js
+++ b/packages/ui-default/components/dialog/index.js
@@ -10,10 +10,13 @@ export default class Dialog {
       $action: null,
       ...options,
     };
+    let box = '';
+    if (options.width) box += `width:${options.width};max-width:${options.width};`;
+    if (options.height) box += `height:${options.height};max-height:${options.height};`;
     this.$dom = $(tpl`
       <div class="dialog withBg ${this.options.classes}" style="display:none">
-        <div class="dialog__content">
-          <div class="dialog__body"></div>
+        <div class="dialog__content" style="${box}">
+          <div class="dialog__body" style="height:calc(100% - 45px);"></div>
           <div class="row"><div class="columns clearfix">
             <div class="float-right dialog__action"></div>
           </div></div>
diff --git a/packages/ui-default/components/editor/cmeditor.page.js b/packages/ui-default/components/editor/cmeditor.page.js
index c59e7aed3..a074c4a69 100644
--- a/packages/ui-default/components/editor/cmeditor.page.js
+++ b/packages/ui-default/components/editor/cmeditor.page.js
@@ -9,6 +9,9 @@ function runSubstitute($container) {
   $container.find('textarea[data-yaml]').get().forEach((element) => {
     CmEditor.getOrConstruct($(element), { language: 'yaml' });
   });
+  $container.find('textarea[data-plain]').get().forEach((element) => {
+    CmEditor.getOrConstruct($(element), { language: 'plain' });
+  });
 }
 
 const cmEditorPage = new AutoloadPage('cmEditorPage', () => {
diff --git a/packages/ui-default/components/editor/index.js b/packages/ui-default/components/editor/index.js
index 4e6d6c3df..e2e90559c 100644
--- a/packages/ui-default/components/editor/index.js
+++ b/packages/ui-default/components/editor/index.js
@@ -37,20 +37,21 @@ export default class Editor extends DOMAttachedObject {
 
   async initMonaco() {
     const monaco = await import('monaco-editor/esm/vs/editor/editor.api');
+    const {
+      onChange, language = 'markdown',
+      theme = UserContext.monacoTheme || 'vs-light',
+      model = `file://model-${Math.random().toString(16)}`,
+      autoResize = true, autoLayout = true,
+    } = this.options;
     const { $dom } = this;
     const hasFocus = $dom.is(':focus') || $dom.hasClass('autofocus');
     const origin = $dom.get(0);
     const ele = document.createElement('div');
     $(ele).width('100%').addClass('textbox');
+    if (!autoResize && $dom.height()) $(ele).height($dom.height());
     $dom.hide();
     origin.parentElement.appendChild(ele);
-    const value = $dom.val();
-    const {
-      onChange, language = 'markdown',
-      theme = UserContext.monacoTheme || 'vs-light',
-      model = `file://model-${Math.random().toString(16)}`,
-      autoResize = true,
-    } = this.options;
+    const value = this.options.value || $dom.val();
     this.model = typeof model === 'string' ? monaco.editor.createModel(value, language, monaco.Uri.parse(model)) : model;
     const cfg = {
       theme,
@@ -58,12 +59,25 @@ export default class Editor extends DOMAttachedObject {
       glyphMargin: true,
       lightbulb: { enabled: true },
       model: this.model,
-      automaticLayout: true,
       minimap: { enabled: false },
       hideCursorInOverviewRuler: true,
       overviewRulerLanes: 0,
       overviewRulerBorder: false,
     };
+    if (autoLayout) cfg.automaticLayout = true;
+    let prevHeight = 0;
+    const updateEditorHeight = () => {
+      const editorElement = this.editor.getDomNode();
+      if (!editorElement) return;
+      const lineHeight = this.editor.getOption(monaco.editor.EditorOption.lineHeight);
+      const lineCount = this.editor.getModel()?.getLineCount() || 1;
+      const height = this.editor.getTopForLineNumber(lineCount + 1) + lineHeight;
+      if (prevHeight !== height) {
+        prevHeight = height;
+        editorElement.style.height = `${height}px`;
+        this.editor.layout();
+      }
+    };
     if (autoResize) {
       cfg.scrollbar = {
         vertical: 'hidden',
@@ -84,23 +98,12 @@ export default class Editor extends DOMAttachedObject {
       label: 'Use light theme',
       run: () => monaco.editor.setTheme('vs-light'),
     });
-    let prevHeight = 0;
-    const updateEditorHeight = () => {
-      const editorElement = this.editor.getDomNode();
-      if (!editorElement) return;
-      const lineHeight = this.editor.getOption(monaco.editor.EditorOption.lineHeight);
-      const lineCount = this.editor.getModel()?.getLineCount() || 1;
-      const height = this.editor.getTopForLineNumber(lineCount + 1) + lineHeight;
-      if (prevHeight !== height) {
-        prevHeight = height;
-        editorElement.style.height = `${height}px`;
-        this.editor.layout();
-      }
-    };
-    this.editor.onDidChangeModelDecorations(() => {
-      updateEditorHeight(); // typing
-      requestAnimationFrame(updateEditorHeight); // folding
-    });
+    if (autoResize) {
+      this.editor.onDidChangeModelDecorations(() => {
+        updateEditorHeight(); // typing
+        requestAnimationFrame(updateEditorHeight); // folding
+      });
+    }
     this._subscription = this.editor.onDidChangeModelContent(() => {
       const val = this.editor.getValue();
       $dom.val(val);
@@ -109,7 +112,7 @@ export default class Editor extends DOMAttachedObject {
     });
     this.isValid = true;
     if (hasFocus) this.focus();
-    updateEditorHeight();
+    if (autoResize) updateEditorHeight();
   }
 
   async initVditor() {
@@ -141,10 +144,20 @@ export default class Editor extends DOMAttachedObject {
     if (hasFocus) this.focus();
   }
 
+  destory() {
+    this.detach();
+    if (this.editor?.destory) this.editor.destory();
+    else if (this.editor?.dispose) this.editor.dispose();
+  }
+
   ensureValid() {
     if (!this.isValid) throw new Error('Editor is not loaded');
   }
 
+  /**
+   * @param {string?} val
+   * @returns {string}
+   */
   value(val) {
     this.ensureValid();
     if (typeof val === 'string') return this.editor.setValue(val);
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index fbfc81de7..76465fea4 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.8.10",
+  "version": "4.8.11",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/pages/problem_files.page.js b/packages/ui-default/pages/problem_files.page.js
index b37135856..43547dc0e 100644
--- a/packages/ui-default/pages/problem_files.page.js
+++ b/packages/ui-default/pages/problem_files.page.js
@@ -4,7 +4,7 @@ import _ from 'lodash';
 import { createZipStream } from 'vj/utils/zip';
 import { NamedPage } from 'vj/misc/Page';
 import Notification from 'vj/components/notification';
-import { ConfirmDialog } from 'vj/components/dialog';
+import { ConfirmDialog, ActionDialog } from 'vj/components/dialog/index';
 import request from 'vj/utils/request';
 import pipeStream from 'vj/utils/pipeStream';
 import tpl from 'vj/utils/tpl';
@@ -166,6 +166,54 @@ const page = new NamedPage('problem_files', () => {
     handleClickUpload(type, files);
   }
 
+  async function startEdit(filename, value) {
+    console.log(filename, value);
+    const { default: Editor } = await import('vj/components/editor/index');
+    const promise = new ActionDialog({
+      $body: tpl`
+        <div class="typo" style="width: 100%; height: 100%">
+          <textarea name="fileContent" style="width: 100%; height: 100%"></textarea>
+        </div>`,
+      width: `${window.innerWidth - 200}px`,
+      height: `${window.innerHeight - 100}px`,
+    }).open();
+    const editor = new Editor($('[name="fileContent"]'), { value, autoResize: false, autoLayout: false });
+    const action = await promise;
+    value = editor.value();
+    editor.destory();
+    if (action !== 'ok') return null;
+    return value;
+  }
+  /**
+   * @param {string} type
+   * @param {JQuery.ClickEvent<HTMLElement, undefined, HTMLElement, HTMLElement>} ev
+   */
+  async function handleEdit(type, ev) {
+    ev.preventDefault();
+    const filename = ev.currentTarget.closest('[data-filename]').getAttribute('data-filename');
+    const filesize = +ev.currentTarget.closest('[data-size]').getAttribute('data-size');
+    const link = $(ev.currentTarget).find('a').attr('href');
+    if (filesize > 8 * 1024 * 1024) Notification.error(i18n('file too large'));
+    Notification.info(i18n('Loading file...'));
+    const res = await request.get(link);
+    const content = await request.get(res.url, undefined, { dataType: 'text' });
+    const val = await startEdit(filename, content);
+    console.log(val);
+    if (typeof val !== 'string') return;
+    Notification.info(i18n('Saving file...'));
+    const data = new FormData();
+    data.append('filename', filename);
+    data.append('file', new Blob([val], { type: 'text/plain' }));
+    data.append('type', type);
+    data.append('operation', 'upload_file');
+    await request.postFile('', data);
+    Notification.success(i18n('File saved.'));
+    await delay(2000);
+    window.location.reload();
+  }
+
+  $('.problem-files-testdata .col--name').on('click', (ev) => handleEdit('testdata', ev));
+  $('.problem-files-additional_file .col--name').on('click', (ev) => handleEdit('additional_file', ev));
   $('.problem-files-testdata').on('dragover', (ev) => handleDragOver('testdata', ev));
   $('.problem-files-additional_file').on('dragover', (ev) => handleDragOver('additional_file', ev));
   $('.problem-files-testdata').on('drop', (ev) => handleDrop('testdata', ev));
diff --git a/packages/ui-default/templates/problem_files.html b/packages/ui-default/templates/problem_files.html
index 00224f0da..62270f9dc 100644
--- a/packages/ui-default/templates/problem_files.html
+++ b/packages/ui-default/templates/problem_files.html
@@ -33,7 +33,7 @@
             </thead>
             <tbody>
               {%- for file in testdata -%}
-              <tr data-filename="{{ file.name }}">
+              <tr data-filename="{{ file.name }}" data-size="{{ file.size }}">
                 <td class="col--checkbox">
                   <label class="compact checkbox">
                     <input type="checkbox" data-checkbox-group="testdata" data-checkbox-range>
@@ -96,7 +96,7 @@
             </thead>
             <tbody>
               {%- for file in additional_file -%}
-              <tr data-filename="{{ file.name }}">
+              <tr data-filename="{{ file.name }}" data-size="{{ file.size }}">
                 <td class="col--checkbox">
                   <label class="compact checkbox">
                     <input type="checkbox" data-checkbox-group="additional_file" data-checkbox-range>
diff --git a/packages/ui-default/utils/request.js b/packages/ui-default/utils/request.js
index 65a333ece..18d6a0eca 100644
--- a/packages/ui-default/utils/request.js
+++ b/packages/ui-default/utils/request.js
@@ -22,7 +22,7 @@ const request = {
           } else if (errorThrown instanceof Error) {
             reject(errorThrown);
           } else if (typeof jqXHR.responseJSON === 'object' && jqXHR.responseJSON.error) {
-            const error = jqXHR.responseJSON.error;
+            const { error } = jqXHR.responseJSON;
             if (error.params) {
               const message = substitute(error.message, ...error.params);
               const err = new Error(message);