From 11dcc177637a234fd624db5d766746dea992bcd4 Mon Sep 17 00:00:00 2001
From: silverwind <me@silverwind.io>
Date: Fri, 31 Jul 2020 04:14:04 +0200
Subject: [PATCH] Improve HTML escaping helper (#12383)

The previous method did not escape single quotes which under some
circumstances can lead to XSS vulnerabilites and the fact that it
depends on jQuery is also not ideal. Replace it with a lightweight
module.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
---
 package-lock.json   |  5 +++++
 package.json        |  1 +
 web_src/js/index.js | 17 +++++++----------
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index d145009323..415fb38016 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4372,6 +4372,11 @@
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.0.2.tgz",
       "integrity": "sha512-gPYAU37hYCUhW5euPeR+Y74F7BL+IBsV93j5cvGriSaD1aG6MGsqsV1yamRdrWrb2j3aiZvb0X+UBOWpx3JWtQ=="
     },
+    "escape-goat": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/escape-goat/-/escape-goat-3.0.0.tgz",
+      "integrity": "sha512-w3PwNZJwRxlp47QGzhuEBldEqVHHhh8/tIPcl6ecf2Bou99cdAt0knihBV0Ecc7CGxYduXVBDheH1K2oADRlvw=="
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
diff --git a/package.json b/package.json
index 3597ed6a5a..d2980e9303 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "css-loader": "4.0.0",
     "cssnano-webpack-plugin": "1.0.3",
     "dropzone": "5.7.2",
+    "escape-goat": "3.0.0",
     "fast-glob": "3.2.4",
     "file-loader": "6.0.0",
     "fomantic-ui": "2.8.6",
diff --git a/web_src/js/index.js b/web_src/js/index.js
index 30a3d26ce4..32fb340dcb 100644
--- a/web_src/js/index.js
+++ b/web_src/js/index.js
@@ -4,6 +4,7 @@
 import './publicpath.js';
 
 import Vue from 'vue';
+import {htmlEscape} from 'escape-goat';
 import 'jquery.are-you-sure';
 import './vendor/semanticdropdown.js';
 
@@ -25,10 +26,6 @@ import {svg, svgs} from './svg.js';
 
 const {AppSubUrl, StaticUrlPrefix, csrf} = window.config;
 
-function htmlEncode(text) {
-  return jQuery('<div />').text(text).html();
-}
-
 let previewFileModes;
 const commentMDEditors = {};
 
@@ -528,12 +525,12 @@ function initCommentForm() {
       switch (input_id) {
         case '#milestone_id':
           $list.find('.selected').html(`<a class="item" href=${$(this).data('href')}>${
-            htmlEncode($(this).text())}</a>`);
+            htmlEscape($(this).text())}</a>`);
           break;
         case '#assignee_id':
           $list.find('.selected').html(`<a class="item" href=${$(this).data('href')}>` +
                         `<img class="ui avatar image" src=${$(this).data('avatar')}>${
-                          htmlEncode($(this).text())}</a>`);
+                          htmlEscape($(this).text())}</a>`);
       }
       $(`.ui${select_id}.list .no-select`).addClass('hide');
       $(input_id).val($(this).data('id'));
@@ -1944,7 +1941,7 @@ function searchUsers() {
         $.each(response.data, (_i, item) => {
           let title = item.login;
           if (item.full_name && item.full_name.length > 0) {
-            title += ` (${htmlEncode(item.full_name)})`;
+            title += ` (${htmlEscape(item.full_name)})`;
           }
           items.push({
             title,
@@ -2220,7 +2217,7 @@ function initTemplateSearch() {
             // Parse the response from the api to work with our dropdown
             $.each(response.data, (_r, repo) => {
               filteredResponse.results.push({
-                name: htmlEncode(repo.full_name),
+                name: htmlEscape(repo.full_name),
                 value: repo.id
               });
             });
@@ -3500,8 +3497,8 @@ function initIssueList() {
               return;
             }
             filteredResponse.results.push({
-              name: `#${issue.number} ${htmlEncode(issue.title)
-              }<div class="text small dont-break-out">${htmlEncode(issue.repository.full_name)}</div>`,
+              name: `#${issue.number} ${htmlEscape(issue.title)
+              }<div class="text small dont-break-out">${htmlEscape(issue.repository.full_name)}</div>`,
               value: issue.id
             });
           });