discourse/plugins/discourse-internet-explorer/plugin.rb

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# frozen_string_literal: true
# name: discourse-internet-explorer
# about: Attempts to provide backward support for internt explorer
# version: 1.0
# authors: Joffrey Jaffeux, David Taylor, Daniel Waterworth, Robin Ward
# url: https://github.com/discourse/discourse/tree/master/plugins/discourse-internet-explorer
enabled_site_setting :discourse_internet_explorer_enabled
hide_plugin if self.respond_to?(:hide_plugin)
register_asset 'stylesheets/ie.scss'
after_initialize do
# Conditionally load the stylesheet. There is unfortunately no easy way to do this via
# Plugin API.
reloadable_patch do |plugin|
ApplicationHelper.module_eval do
alias_method :previous_discourse_stylesheet_link_tag, :discourse_stylesheet_link_tag
def discourse_stylesheet_link_tag(name, opts = {})
if name == 'discourse-internet-explorer'
return unless SiteSetting.discourse_internet_explorer_enabled?
return unless request.env['HTTP_USER_AGENT'] =~ /MSIE|Trident/
end
previous_discourse_stylesheet_link_tag(name, opts)
end
end
end
register_anonymous_cache_key(:ie) do
unless defined?(@is_ie)
session = @env[self.class::RACK_SESSION]
# don't initialize params until later
# otherwise you get a broken params on the request
params = {}
@is_ie = BrowserDetection.browser(@env[self.class::USER_AGENT]) == :ie
end
@is_ie
end
# not using patch on preload_script as js is fine and we need this file
# to be loaded before other files
register_html_builder('server:before-script-load') do |controller|
if BrowserDetection.browser(controller.request.env['HTTP_USER_AGENT']) == :ie
path = controller.helpers.script_asset_path('/plugins/discourse-internet-explorer/js/ie')
<<~JAVASCRIPT
<script src="#{path}"></script>
JAVASCRIPT
end
end
end