| import DOMPurify from 'dompurify'; |
| import type { Transformer } from './types'; |
| |
|
|
| const DOCTYPE_XHTML11 = `<!DOCTYPE html PUBLIC |
| "-//W3C//DTD XHTML 1.1//EN" |
| "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">`; |
|
|
| export const sanitizerTransformer: Transformer = { |
| name: 'sanitizer', |
|
|
| transform: async (ctx) => { |
| const allowScript = ctx.viewSettings.allowScript; |
| if (allowScript) return ctx.content; |
|
|
| const result = ctx.content.replaceAll(' ', ' '); |
|
|
| const sanitized = DOMPurify.sanitize(result, { |
| WHOLE_DOCUMENT: true, |
| FORBID_TAGS: ['script'], |
| ALLOWED_URI_REGEXP: |
| /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|sms|cid|xmpp|blob|data):|[^a-z]|[a-z+.\-]+(?:[^a-z+.\-:]|$))/i, |
| ADD_TAGS: ['link', 'meta'], |
| ADD_ATTR: (attributeName: string) => { |
| const attrWhitelist = [ |
| 'xmlns', |
| 'http-equiv', |
| 'content', |
| 'charset', |
| 'link', |
| 'vlink', |
| 'imt-state', |
| 'data-wr-footernote', |
| 'zy-footnote', |
| ]; |
| return ( |
| attrWhitelist.includes(attributeName) || |
| attributeName.startsWith('xml:') || |
| attributeName.startsWith('xmlns:') || |
| attributeName.startsWith('epub:') |
| ); |
| }, |
| RETURN_DOM: true, |
| }); |
|
|
| const serializer = new XMLSerializer(); |
| let serialized = serializer.serializeToString(sanitized); |
| serialized = serialized.replaceAll(' ', ' ').replaceAll('\u00A0', ' '); |
| serialized = '<?xml version="1.0" encoding="utf-8"?>' + DOCTYPE_XHTML11 + serialized; |
| serialized = serialized.replace(/(<head[^>]*>)/i, '\n$1'); |
| serialized = serialized.replace(/(<\/body>)(<\/html>)/i, '$1\n$2'); |
|
|
| |
|
|
| return serialized; |
| }, |
| }; |
|
|
