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Add HTML content transformer middleware (#5338)
* Add HTML content transformer * Add entry * Fix alt text * Apply to fenced code blocks only * Add breaking changes * Update entry * Add PR * Fix tests * Fix test * Add xmlns and remove HTML content provider related attributes --------- Co-authored-by: Eugene <EOlonov@gmail.com>
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8 changes: 8 additions & 0 deletions
8
packages/bundle/src/markdown/createHTMLContentTransformMiddleware.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| import { type HTMLContentTransformMiddleware } from 'botframework-webchat-component'; | ||
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| import createCodeBlockCopyButtonMiddleware from './middleware/createCodeBlockCopyButtonMiddleware'; | ||
| import createSanitizeMiddleware from './middleware/createSanitizeMiddleware'; | ||
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| export default function createHTMLContentTransformMiddleware(): readonly HTMLContentTransformMiddleware[] { | ||
| return Object.freeze([createCodeBlockCopyButtonMiddleware(), createSanitizeMiddleware()]); | ||
| } |
18 changes: 18 additions & 0 deletions
18
packages/bundle/src/markdown/middleware/createCodeBlockCopyButtonMiddleware.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| import { type HTMLContentTransformMiddleware } from 'botframework-webchat-component'; | ||
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| import codeBlockCopyButtonDocumentMod from '../private/codeBlockCopyButtonDocumentMod'; | ||
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| export default function createCodeBlockCopyButtonMiddleware(): HTMLContentTransformMiddleware { | ||
| return () => next => request => | ||
| next( | ||
| Object.freeze({ | ||
| ...request, | ||
| documentFragment: codeBlockCopyButtonDocumentMod(request.documentFragment, { | ||
| codeBlockCopyButtonAltCopied: request.codeBlockCopyButtonAltCopied, | ||
| codeBlockCopyButtonAltCopy: request.codeBlockCopyButtonAltCopy, | ||
| codeBlockCopyButtonClassName: request.codeBlockCopyButtonClassName, | ||
| codeBlockCopyButtonTagName: request.codeBlockCopyButtonTagName | ||
| }) | ||
| }) | ||
| ); | ||
| } |
109 changes: 109 additions & 0 deletions
109
packages/bundle/src/markdown/middleware/createSanitizeMiddleware.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| import { | ||
| parseDocumentFragmentFromString, | ||
| serializeDocumentFragmentIntoString | ||
| } from 'botframework-webchat-component/internal'; | ||
| import sanitizeHTML from 'sanitize-html'; | ||
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| const BASE_SANITIZE_HTML_OPTIONS = Object.freeze({ | ||
| allowedAttributes: { | ||
| a: ['aria-label', 'class', 'href', 'name', 'rel', 'target'], | ||
| button: ['aria-label', 'class', 'type', 'value'], | ||
| img: ['alt', 'aria-label', 'class', 'src', 'title'], | ||
| pre: ['class'], | ||
| span: ['aria-label'] | ||
| }, | ||
| allowedSchemes: ['data', 'http', 'https', 'ftp', 'mailto', 'sip', 'tel'], | ||
| allowedTags: [ | ||
| 'a', | ||
| 'b', | ||
| 'blockquote', | ||
| 'br', | ||
| 'button', | ||
| 'caption', | ||
| 'code', | ||
| 'del', | ||
| 'div', | ||
| 'em', | ||
| 'h1', | ||
| 'h2', | ||
| 'h3', | ||
| 'h4', | ||
| 'h5', | ||
| 'h6', | ||
| 'hr', | ||
| 'i', | ||
| 'img', | ||
| 'ins', | ||
| 'li', | ||
| 'nl', | ||
| 'ol', | ||
| 'p', | ||
| 'pre', | ||
| 's', | ||
| 'span', | ||
| 'strike', | ||
| 'strong', | ||
| 'table', | ||
| 'tbody', | ||
| 'td', | ||
| 'tfoot', | ||
| 'th', | ||
| 'thead', | ||
| 'tr', | ||
| 'ul', | ||
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| // Followings are for MathML elements, from https://developer.mozilla.org/en-US/docs/Web/MathML. | ||
| 'annotation-xml', | ||
| 'annotation', | ||
| 'math', | ||
| 'merror', | ||
| 'mfrac', | ||
| 'mi', | ||
| 'mmultiscripts', | ||
| 'mn', | ||
| 'mo', | ||
| 'mover', | ||
| 'mpadded', | ||
| 'mphantom', | ||
| 'mprescripts', | ||
| 'mroot', | ||
| 'mrow', | ||
| 'ms', | ||
| 'mspace', | ||
| 'msqrt', | ||
| 'mstyle', | ||
| 'msub', | ||
| 'msubsup', | ||
| 'msup', | ||
| 'mtable', | ||
| 'mtd', | ||
| 'mtext', | ||
| 'mtr', | ||
| 'munder', | ||
| 'munderover', | ||
| 'semantics' | ||
| ], | ||
| // Bug of https://github.com/apostrophecms/sanitize-html/issues/633. | ||
| // They should not remove `alt=""` even though it is empty. | ||
| nonBooleanAttributes: [] | ||
| }); | ||
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| export default function createSanitizeMiddleware() { | ||
| return () => () => request => { | ||
| const { codeBlockCopyButtonTagName, documentFragment } = request; | ||
| const sanitizeHTMLOptions = { | ||
| ...BASE_SANITIZE_HTML_OPTIONS, | ||
| allowedAttributes: { | ||
| ...BASE_SANITIZE_HTML_OPTIONS.allowedAttributes, | ||
| [codeBlockCopyButtonTagName]: ['class', 'data-alt-copy', 'data-alt-copied', 'data-testid', 'data-value'] | ||
| }, | ||
| allowedTags: [...BASE_SANITIZE_HTML_OPTIONS.allowedTags, codeBlockCopyButtonTagName] | ||
| }; | ||
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| const htmlAfterBetterLink = serializeDocumentFragmentIntoString(documentFragment); | ||
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| const htmlAfterSanitization = sanitizeHTML(htmlAfterBetterLink, sanitizeHTMLOptions); | ||
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| return parseDocumentFragmentFromString(htmlAfterSanitization); | ||
| }; | ||
| } |
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