Remove unused kconv require for Ruby 3.4 compatibility

[Copilot]

Ruby 3.4 removed kconv from stdlib, causing plugin load failures. The library was required but never used in the codebase.

Changes

• Removed unused require 'kconv' from lib/omniauth-ldap/adaptor.rb

# Before
require 'rack'
require 'net/ldap'
require 'net/ntlm'
require 'sasl'
require 'kconv'  # Unused, causes LoadError on Ruby 3.4+

# After
require 'rack'
require 'net/ldap'
require 'net/ntlm'
require 'sasl'

No kconv methods (Kconv, toutf8, tosjis, etc.) are referenced anywhere in the codebase.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• stdgems.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Ruby 3.4 Compatibility: LoadError - cannot load such file -- kconv</issue_title>
<issue_description>## Environment

• Discourse version: latest (tests-passed branch)
• discourse-ldap-auth: latest compatible version
• Ruby version: 3.4.7
• Docker base image: discourse/base:2.0.20260209-1300

Problem

The plugin fails to load during bundle exec rake db:migrate with the following error:

LoadError: cannot load such file -- kconv (LoadError)
/var/www/discourse/plugins/ldap/lib/omniauth-ldap/adaptor.rb:8:in '<main>'

Root Cause

The kconv library was removed from Ruby's standard library in Ruby 3.4 and must now be added as an explicit gem dependency.

Reference: https://stdgems.org/kconv/

Impact

• Plugin cannot be installed on systems using Ruby 3.4+
• Blocks Discourse container rebuild
• Affects all users upgrading to newer Discourse versions that use Ruby 3.4

Suggested Fix

Add kconv gem to the plugin's gemspec or Gemfile:

gem 'kconv'

Full Stack Trace

LoadError: cannot load such file -- kconv (LoadError)
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/bootsnap-1.19.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:27:in 'Kernel#require'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/zeitwerk-2.7.3/lib/zeitwerk/core_ext/kernel.rb:34:in 'Kernel#require'
/var/www/discourse/plugins/ldap/lib/omniauth-ldap/adaptor.rb:8:in '<main>'
/var/www/discourse/plugins/ldap/plugin.rb:14:in 'Kernel#require_relative'
/var/www/discourse/plugins/ldap/plugin.rb:14:in 'Plugin::Instance#activate!'
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Ruby 3.4 Compatibility: LoadError - cannot load such file -- kconv #90

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.