Fix markdown conversion for assessments

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/MarkdownEditor/MarkdownEditor.vue

@@ -57,23 +57,19 @@
   import '../mathquill/mathquill.js';
   import 'codemirror/lib/codemirror.css';
   import '@toast-ui/editor/dist/toastui-editor.css';
-  import * as Showdown from 'showdown';
 
   import Editor from '@toast-ui/editor';
-  import { stripHtml } from 'string-strip-html';
 
   import imageUpload, { paramsToImageFieldHTML } from '../plugins/image-upload';
   import formulas from '../plugins/formulas';
   import minimize from '../plugins/minimize';
-  import formulaHtmlToMd from '../plugins/formulas/formula-html-to-md';
   import formulaMdToHtml from '../plugins/formulas/formula-md-to-html';
-  import imagesHtmlToMd from '../plugins/image-upload/image-html-to-md';
   import imagesMdToHtml from '../plugins/image-upload/image-md-to-html';
 
   import { CLASS_MATH_FIELD_ACTIVE } from '../constants';
   import { registerMarkdownFormulaField } from '../plugins/formulas/MarkdownFormulaField';
   import { registerMarkdownImageField } from '../plugins/image-upload/MarkdownImageField';
-  import { clearNodeFormat, getExtensionMenuPosition } from './utils';
+  import { clearNodeFormat, generateCustomConverter, getExtensionMenuPosition } from './utils';
   import FormulasMenu from './FormulasMenu/FormulasMenu';
   import ImagesMenu from './ImagesMenu/ImagesMenu';
   import ClickOutside from 'shared/directives/click-outside';
@@ -167,38 +163,7 @@
     mounted() {
       this.mathQuill = MathQuill.getInterface(2);
 
-      // This is currently the only way of inheriting and adjusting
-      // default TUI's convertor methods
-      // see https://github.com/nhn/tui.editor/issues/615
-      const tmpEditor = new Editor({
-        el: this.$refs.editor,
-      });
-      const showdown = new Showdown.Converter();
-      const Convertor = tmpEditor.convertor.constructor;
-      class CustomConvertor extends Convertor {
-        toMarkdown(content) {
-          content = imagesHtmlToMd(content);
-          content = formulaHtmlToMd(content);
-          content = showdown.makeMarkdown(content);
-          // TUI.editor sprinkles in extra `<br>` tags that Kolibri renders literally
-          // When showdown has already added linebreaks to render these in markdown
-          // so we just remove these here.
-          content = content.replaceAll('<br>', '');
-
-          // any copy pasted rich text that renders as HTML but does not get converted
-          // will linger here, so remove it as Kolibri will render it literally also.
-          content = stripHtml(content).result;
-          return content;
-        }
-        toHTML(content) {
-          // Kolibri and showdown assume double newlines for a single line break,
-          // wheras TUI.editor prefers single newline characters.
-          content = content.replaceAll('\n\n', '\n');
-          content = super.toHTML(content);
-          return content;
-        }
-      }
-      tmpEditor.remove();
+      const CustomConvertor = generateCustomConverter(this.$refs.editor);
 
       const createBoldButton = () => {
         {
@@ -268,8 +233,8 @@
         // https://github.com/nhn/tui.editor/blob/master/apps/editor/docs/custom-html-renderer.md
         customHTMLRenderer: {
           text(node) {
-            let content = formulaMdToHtml(node.literal);
-            content = imagesMdToHtml(content);
+            let content = formulaMdToHtml(node.literal, true);
+            content = imagesMdToHtml(content, true);
             return {
               type: 'html',
               content,

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/MarkdownEditor/utils.js

@@ -1,3 +1,10 @@
+import * as Showdown from 'showdown';
+import Editor from '@toast-ui/editor';
+import { stripHtml } from 'string-strip-html';
+
+import imagesHtmlToMd from '../plugins/image-upload/image-html-to-md';
+import formulaHtmlToMd from '../plugins/formulas/formula-html-to-md';
+
 /**
  * Clear DOM node by keeping only its text content.
  *
@@ -74,3 +81,37 @@ export const getExtensionMenuPosition = ({ editorEl, targetX, targetY }) => {
     right: menuRight,
   };
 };
+
+export const generateCustomConverter = el => {
+  // This is currently the only way of inheriting and adjusting
+  // default TUI's convertor methods
+  // see https://github.com/nhn/tui.editor/issues/615
+  const tmpEditor = new Editor({ el });
+  const showdown = new Showdown.Converter();
+  const Convertor = tmpEditor.convertor.constructor;
+  class CustomConvertor extends Convertor {
+    toMarkdown(content) {
+      content = showdown.makeMarkdown(content);
+      content = imagesHtmlToMd(content);
+      content = formulaHtmlToMd(content);
+      // TUI.editor sprinkles in extra `<br>` tags that Kolibri renders literally
+      // When showdown has already added linebreaks to render these in markdown
+      // so we just remove these here.
+      content = content.replaceAll('<br>', '');
+
+      // any copy pasted rich text that renders as HTML but does not get converted
+      // will linger here, so remove it as Kolibri will render it literally also.
+      content = stripHtml(content).result;
+      return content;
+    }
+    toHTML(content) {
+      // Kolibri and showdown assume double newlines for a single line break,
+      // wheras TUI.editor prefers single newline characters.
+      content = content.replaceAll('\n\n', '\n');
+      content = super.toHTML(content);
+      return content;
+    }
+  }
+  tmpEditor.remove();
+  return CustomConvertor;
+};

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/__tests__/utils.spec.js

@@ -1,4 +1,9 @@
-import { clearNodeFormat } from '../MarkdownEditor/utils';
+/**
+ * @jest-environment jest-environment-jsdom-sixteen
+ */
+// Jsdom@^16 is required to test toast UI, as it relies on the Range API.
+
+import { clearNodeFormat, generateCustomConverter } from '../MarkdownEditor/utils';
 
 const htmlStringToFragment = htmlString => {
   const template = document.createElement('template');
@@ -56,3 +61,17 @@ describe('clearNodeFormat', () => {
     );
   });
 });
+
+describe('markdown conversion', () => {
+  it('converts image tags to markdown without escaping them', () => {
+    const el = document.createElement('div');
+    const CustomConvertor = generateCustomConverter(el);
+    const converter = new CustomConvertor();
+    const html =
+      '<span is="markdown-image-field" vce-ready="" contenteditable="false" class="markdown-field-753aa86a-8159-403b-8b1c-d2b8f9504408 markdown-field-34843d46-79b8-40b4-866c-b83dc8916a47" editing="true" markdown="![](${☣ CONTENTSTORAGE}/bc1c5a86e1e46f20a6b4ee2c1bb6d6ff.png =485.453125x394)">![](${☣ CONTENTSTORAGE}/bc1c5a86e1e46f20a6b4ee2c1bb6d6ff.png =485.453125x394)</span>';
+
+    expect(converter.toMarkdown(html)).toBe(
+      '![](${☣ CONTENTSTORAGE}/bc1c5a86e1e46f20a6b4ee2c1bb6d6ff.png =485.453125x394)'
+    );
+  });
+});

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/plugins/formulas/formula-md-to-html.js

@@ -12,6 +12,10 @@
  *
  */
 
-export default markdown => {
-  return markdown.replace(/\$\$(.*?)\$\$/g, '<span is="markdown-formula-field">$1</span>');
+export default (markdown, editing) => {
+  const editAttr = editing ? ' editing="true"' : '';
+  return markdown.replace(
+    /\$\$(.*?)\$\$/g,
+    `<span is="markdown-formula-field"${editAttr}>$1</span>`
+  );
 };

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/plugins/image-upload/image-md-to-html.js

@@ -14,6 +14,6 @@ import { IMAGE_REGEX, imageMdToImageFieldHTML } from './index';
 
 // convert markdown images to image editor field custom elements
 
-export default markdown => {
-  return markdown.replace(IMAGE_REGEX, imageMd => imageMdToImageFieldHTML(imageMd));
+export default (markdown, editing) => {
+  return markdown.replace(IMAGE_REGEX, imageMd => imageMdToImageFieldHTML(imageMd, editing));
 };

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/plugins/image-upload/index.js

@@ -30,8 +30,10 @@ export const paramsToImageMd = ({ src, alt, width, height }) => {
   }
 };
 
-export const imageMdToImageFieldHTML = imageMd =>
-  `<span is='markdown-image-field'>${imageMd}</span>`;
+export const imageMdToImageFieldHTML = (imageMd, editing) => {
+  const editAttr = editing ? ' editing="true"' : '';
+  return `<span is='markdown-image-field'${editAttr}>${imageMd}</span>`;
+};
 export const paramsToImageFieldHTML = params => imageMdToImageFieldHTML(paramsToImageMd(params));
 
 export default imageUploadExtension;

contentcuration/contentcuration/frontend/shared/views/MarkdownEditor/plugins/registerCustomMarkdownField.js

@@ -102,11 +102,11 @@ export default VueComponent => {
             ''
           );
         }
-        this.parentNode.removeChild(this);
+        if (this.parentNode) {
+          this.parentNode.removeChild(this);
+        }
       });
 
-      this.editing = true;
-
       if (!hasLeftwardSpace(this)) {
         this.insertAdjacentText('beforebegin', '\xa0');
       }