Revert "chore: Remove dompurify (#1490)"

This reverts commit e2c0853.

package.json

@@ -65,6 +65,7 @@
     "*.js": "eslint --fix"
   },
   "dependencies": {
+    "dompurify": "^2.3.1",
     "marked": "^1.2.9",
     "medium-zoom": "^1.0.6",
     "opencollective-postinstall": "^2.0.2",

packages/docsify-server-renderer/index.js

@@ -3,6 +3,7 @@ import { resolve, basename } from 'path';
 import resolvePathname from 'resolve-pathname';
 import fetch from 'node-fetch';
 import debug from 'debug';
+import DOMPurify from 'dompurify';
 import { AbstractHistory } from '../../src/core/router/history/abstract';
 import { Compiler } from '../../src/core/render/compiler';
 import { isAbsolutePath } from '../../src/core/router/util';
@@ -122,10 +123,10 @@ export default class Renderer {
       this._renderHtml('cover', await this._render(coverFile), 'cover');
     }
 
-    const html = this.html;
-
+    const html = this.isRemoteUrl
+      ? DOMPurify.sanitize(this.html, { ADD_TAGS: ['script'] })
+      : this.html;
     this.html = this.template;
-
     return html;
   }