Module:Effective protection level

Documentation for this module may be found at wikipedia:Module:Effective protection level/doc

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' and action ~= 'undelete' then
		error( 'First parameter must be one of edit, move, create, upload, undelete, autoreview', 2 )
	end
	if title.namespace == 8 then -- MediaWiki namespace
		if title.text:sub(-3) == '.js' or title.text:sub(-4) == '.css' or title.contentModel == 'javascript' or title.contentModel == 'css' then -- site JS or CSS page
			return 'interfaceadmin'
		elseif title.baseText == "Gadgets-definition" then
			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
	if action == 'undelete' then
		return 'sysop'
	end
	local level = title.protectionLevels[action] and title.protectionLevels[action][1]
	if level == 'sysop' or level == 'editprotected' then
		return 'sysop'
	elseif title.cascadingProtection.restrictions[action] and title.cascadingProtection.restrictions[action][1] then -- used by a cascading-protected page
		return 'sysop'
	elseif level == 'templateeditor' then
		return 'templateeditor'
	elseif action == 'move' then
		if title.namespace == 6 then
			return 'filemover'
		elseif level == 'extendedconfirmed' then
			return 'extendedconfirmed'
		else
			return 'autoconfirmed'
		end
	end
	if level == 'editsemiprotected' then -- create-semiprotected pages return this for some reason
		return 'autoconfirmed'
	elseif level then
		return level
	elseif action == 'upload' then
		return 'autoconfirmed'
	elseif action == 'create' and title.namespace % 2 == 0 and title.namespace ~= 118 then -- You need to be registered, but not autoconfirmed, to create non-talk pages other than drafts
		if title.namespace == 0 then
			return 'autoconfirmed' -- Per [[WP:ACPERM]], you need to be autoconfirmed to create pages in mainspace
		end
		return 'user'
	else
		return '*'
	end
end

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

return p