From 6b03658cc55ae3add10ddf0a91a627121b1e8dce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marius=20B=C4=82LTEANU?= <marius.balteanu@zitec.com>
Date: Tue, 22 Apr 2025 23:57:40 +0300
Subject: [PATCH] Replaces deckar01-task_list gem with commonmark tasklist
 extension.


diff --git a/Gemfile b/Gemfile
index d7ea765b5..d08b7661c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -49,7 +49,6 @@ end
 # Optional CommonMark support, not for JRuby
 group :common_mark do
   gem "commonmarker", '~> 2.3.0'
-  gem 'deckar01-task_list', '2.3.2'
 end
 
 # Include database gems for the adapters found in the database
diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index d6288ad4f..9b770c588 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -1610,10 +1610,11 @@ a.wiki-anchor:hover { color: #aaa !important; text-decoration: none; }
 h1:hover a.wiki-anchor, h2:hover a.wiki-anchor, h3:hover a.wiki-anchor, h4:hover a.wiki-anchor, h5:hover a.wiki-anchor, h6:hover a.wiki-anchor { display: inline; color: #ddd; }
 
 div.wiki img {vertical-align:middle; max-width:100%;}
-div.wiki>.task-list {
-  padding-left: 0px;
+
+div.wiki>.contains-task-list {
+  padding-left: 0;
 }
-div.wiki .task-list {
+div.wiki .contains-task-list {
   list-style-type: none;
 }
 div.wiki .task-list input.task-list-item-checkbox {
diff --git a/lib/redmine/wiki_formatting/common_mark/formatter.rb b/lib/redmine/wiki_formatting/common_mark/formatter.rb
index eb765b6d6..b695fb854 100644
--- a/lib/redmine/wiki_formatting/common_mark/formatter.rb
+++ b/lib/redmine/wiki_formatting/common_mark/formatter.rb
@@ -18,7 +18,6 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 require 'html/pipeline'
-require 'task_list/filter'
 
 module Redmine
   module WikiFormatting
@@ -33,7 +32,7 @@ module Redmine
           autolink: true,
           footnotes: true,
           header_ids: nil,
-          tasklist: false,
+          tasklist: true,
           shortcodes: false,
         }.freeze,
 
@@ -46,6 +45,7 @@ module Redmine
           unsafe: true,
           github_pre_lang: false,
           hardbreaks: Redmine::Configuration['common_mark_enable_hardbreaks'] == true,
+          tasklist_classes: true,
         }.freeze,
         commonmarker_plugins: {
           syntax_highlighter: nil
@@ -57,8 +57,7 @@ module Redmine
         SanitizationFilter,
         SyntaxHighlightFilter,
         FixupAutoLinksFilter,
-        ExternalLinksFilter,
-        TaskList::Filter
+        ExternalLinksFilter
       ], PIPELINE_CONFIG
 
       class Formatter
diff --git a/lib/redmine/wiki_formatting/common_mark/sanitization_filter.rb b/lib/redmine/wiki_formatting/common_mark/sanitization_filter.rb
index cdefc372b..e603d9f7f 100644
--- a/lib/redmine/wiki_formatting/common_mark/sanitization_filter.rb
+++ b/lib/redmine/wiki_formatting/common_mark/sanitization_filter.rb
@@ -78,20 +78,58 @@ module Redmine
           # allowlist[:attributes]["td"] = %w(style)
           # allowlist[:css] = { properties: ["text-align"] }
 
-          # Allow `id` in a and li elements for footnotes
-          # and remove any `id` properties not matching for footnotes
+          # Allow `id` in a elements for footnotes
           allowlist[:attributes]["a"].push "id"
-          allowlist[:attributes]["li"] = %w(id)
+          # Remove any `id` property not matching for footnotes
           allowlist[:transformers].push lambda{|env|
             node = env[:node]
-            return unless node.name == "a" || node.name == "li"
+            return unless node.name == "a"
             return unless node.has_attribute?("id")
             return if node.name == "a" && node["id"] =~ /\Afnref-\d+\z/
-            return if node.name == "li" && node["id"] =~ /\Afn-\d+\z/
 
             node.remove_attribute("id")
           }
 
+          # allow `id` in li element for footnotes
+          # allow `class` in li element for task list items
+          allowlist[:attributes]["li"] = %w(id class)
+          allowlist[:transformers].push lambda{|env|
+            node = env[:node]
+            return unless node.name == "li"
+
+            if node.has_attribute?("id") && !(node["id"] =~ /\Afn-\d+\z/)
+              node.remove_attribute("id")
+            end
+
+            if node.has_attribute?("class") && node["class"] != "task-list-item"
+              node.remove_attribute("class")
+            end
+          }
+
+          # allow input type = "checkbox" with class "task-list-item-checkbox"
+          # for task list items
+          allowlist[:elements].push('input')
+          allowlist[:attributes]["input"] = %w(class type)
+          allowlist[:transformers].push lambda{|env|
+            node = env[:node]
+
+            return unless node.name == "input"
+            return if node['type'] == "checkbox" && node['class'] == "task-list-item-checkbox"
+
+            node.replace(node.children)
+          }
+
+          # allow class "contains-task-list" on ul for task list items
+          allowlist[:attributes]["ul"] = %w(class)
+          allowlist[:transformers].push lambda{|env|
+            node = env[:node]
+
+            return unless node.name == "ul"
+            return if node["class"] == "contains-task-list"
+
+            node.remove_attribute("class")
+          }
+
           # https://github.com/rgrove/sanitize/issues/209
           allowlist[:protocols].delete("a")
           allowlist[:transformers].push lambda{|env|
diff --git a/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb b/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb
index 11d5913ce..79581a928 100644
--- a/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/common_mark/formatter_test.rb
@@ -287,7 +287,7 @@ class Redmine::WikiFormatting::CommonMark::FormatterTest < ActionView::TestCase
 
       expected = <<~EXPECTED
         <p>Task list:</p>
-        <ul class="task-list">
+        <ul class="contains-task-list">
         <li class="task-list-item">
         <input type="checkbox" class="task-list-item-checkbox" disabled> Task 1
         </li>
diff --git a/test/unit/lib/redmine/wiki_formatting/html_sanitizer_test.rb b/test/unit/lib/redmine/wiki_formatting/html_sanitizer_test.rb
index 11dddb5f8..90e02640d 100644
--- a/test/unit/lib/redmine/wiki_formatting/html_sanitizer_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/html_sanitizer_test.rb
@@ -35,4 +35,25 @@ class Redmine::WikiFormatting::HtmlSanitizerTest < ActiveSupport::TestCase
     input = %(<a href="javascript:alert('hello');">foo</a>)
     assert_equal "<a>foo</a>", @sanitizer.call(input)
   end
+
+  def test_should_be_strict_with_task_list_items
+    to_test = {
+      %(<input type="checkbox" class="">) => "",
+      %(<input type="checkbox" class="task-list-item-checkbox other">) => "",
+      %(<input type="checkbox" class="task-list-item-checkbox" id="item1">) => %(<input type="checkbox" class="task-list-item-checkbox">),
+      %(<input type="text" class="">) => "",
+      %(<input />) => "",
+      %(<ul class="other"></ul) => "<ul></ul>",
+      %(<ul class="contains-task-list"></ul) => "<ul class=\"contains-task-list\"></ul>",
+      %(<ul class="contains-task-list" id="list1"></ul) => "<ul class=\"contains-task-list\"></ul>",
+      %(<li class="other"></li>) => "",
+      %(<li id="other"></li>) => "",
+      %(<li class="task-list-item"></li>) => "",
+      %(<li class="task-list-item">Item 1</li>) => "Item 1",
+    }
+    to_test.each do |input, result|
+      assert_equal result, @sanitizer.call(input)
+    end
+
+  end
 end
-- 
2.39.5 (Apple Git-154)