Editing Module:Effective protection level

local p = {}

-- Returns the permission required to perform a given action on a given title.
-- If no title is specified, the title of the page being displayed is used.
function p._main(action, pagename)
	local title
	if type(pagename) == 'table' and pagename.prefixedText then
		title = pagename
	elseif pagename then
		title = mw.title.new(pagename)
	else
		title = mw.title.getCurrentTitle()
	end
	pagename = title.prefixedText
	if action == 'autoreview' then
		local level = mw.ext.FlaggedRevs.getStabilitySettings(title)
		level = level and level.autoreview
		if level == 'review' then
			return 'reviewer'
		elseif level ~= '' then
			return level
		else
			return nil -- not '*'. a page not being PC-protected is distinct from it being PC-protected with anyone able to review. also not '', as that would mean PC-protected but nobody can review
		end
	elseif action ~= 'edit' and action ~= 'move' and action ~= 'create' and action ~= 'upload' then
		error( 'First parameter must be one of edit, move, create, upload, autoreview', 2 )
	end
	if title.namespace == 8 then -- MediaWiki namespace
		if title.contentModel == 'javascript' or title.contentModel == 'css' then -- site JS or CSS page
			return 'interfaceadmin'
		else -- any non-JS/CSS MediaWiki page
			return 'sysop'
		end
	elseif title.namespace == 2 and title.isSubpage then
		if title.contentModel == 'javascript' or title.contentModel == 'css' then -- user JS or CSS page
			return 'interfaceadmin'
		elseif title.contentModel == 'json' then -- user JSON page
			return 'sysop'
		end
	end
	end

setmetatable(p, { __index = function(t, k)
	return function(frame)
		return t._main(k, frame.args[1])
	end
end })

return p