Module:Protection banner

    From Consumerium development wiki R&D Wiki
    Revision as of 20:33, 9 November 2018 by Jukeboksi (talk | contribs) (1 revision imported)

    Documentation for this module may be created at Module:Protection banner/doc

    -- This module implements {{pp-meta}} and its daughter templates such as
    -- {{pp-dispute}}, {{pp-vandalism}} and {{pp-sock}}.
    
    -- Initialise necessary modules.
    require('Module:No globals')
    local makeFileLink = require('Module:File link')._main
    local effectiveProtectionLevel = require('Module:Effective protection level')._main
    local effectiveProtectionExpiry = require('Module:Effective protection expiry')._main
    local yesno = require('Module:Yesno')
    
    -- Lazily initialise modules and objects we don't always need.
    local getArgs, makeMessageBox, lang
    
    -- Set constants.
    local CONFIG_MODULE = 'Module:Protection banner/config'
    
    --------------------------------------------------------------------------------
    -- Helper functions
    --------------------------------------------------------------------------------
    
    local function makeCategoryLink(cat, sort)
    	if cat then
    		return string.format(
    			'[[%s:%s|%s]]',
    			mw.site.namespaces[14].name,
    			cat,
    			sort
    		)
    	end
    end
    
    -- Validation function for the expiry and the protection date
    local function validateDate(dateString, dateType)
    	if not lang then
    		lang = mw.language.getContentLanguage()
    	end
    	local success, result = pcall(lang.formatDate, lang, 'U', dateString)
    	if success then
    		result = tonumber(result)
    		if result then
    			return result
    		end
    	end
    	error(string.format(
    		'invalid %s: %s',
    		dateType,
    		tostring(dateString)
    	), 4)
    end
    
    local function makeFullUrl(page, query, display)
    	return string.format(
    		'[%s %s]',
    		tostring(mw.uri.fullUrl(page, query)),
    		display
    	)
    end
    
    -- Given a directed graph formatted as node -> table of direct successors,
    -- get a table of all nodes reachable from a given node (though always
    -- including the given node).
    local function getReachableNodes(graph, start)
    	local toWalk, retval = {[start] = true}, {}
    	while true do
    		-- Can't use pairs() since we're adding and removing things as we're iterating
    		local k = next(toWalk) -- This always gets the "first" key
    		if k == nil then
    			return retval
    		end
    		toWalk[k] = nil
    		retval[k] = true
    		for _,v in ipairs(graph[k]) do
    			if not retval[v] then
    				toWalk[v] = true
    			end
    		end
    	end
    end
    
    --------------------------------------------------------------------------------
    -- Protection class
    --------------------------------------------------------------------------------
    
    local Protection = {}
    Protection.__index = Protection
    
    Protection.supportedActions = {
    	edit = true,
    	move = true,
    	autoreview = true,
    	upload = true
    }
    
    Protection.bannerConfigFields = {
    	'text',
    	'explanation',
    	'tooltip',
    	'alt',
    	'link',
    	'image'
    }
    
    function Protection.new(args, cfg, title)
    	local obj = {}
    	obj._cfg = cfg
    	obj.title = title or mw.title.getCurrentTitle()
    
    	-- Set action
    	if not args.action then
    		obj.action = 'edit'
    	elseif Protection.supportedActions[args.action] then
    		obj.action = args.action
    	else
    		error(string.format(
    			'invalid action: %s',
    			tostring(args.action)
    		), 3)
    	end
    
    	-- Set level
    	obj.level = args.demolevel or effectiveProtectionLevel(obj.action, obj.title)
    	if not obj.level or (obj.action == 'move' and obj.level == 'autoconfirmed') then
    		-- Users need to be autoconfirmed to move pages anyway, so treat
    		-- semi-move-protected pages as unprotected.
    		obj.level = '*'
    	end
    
    	-- Set expiry
    	local effectiveExpiry = effectiveProtectionExpiry(obj.action, obj.title)
    	if effectiveExpiry == 'infinity' then
    		obj.expiry = 'indef'
    	elseif effectiveExpiry ~= 'unknown' then
    		obj.expiry = validateDate(effectiveExpiry, 'expiry date')
    	end
    
    	-- Set reason
    	if args[1] then
    		obj.reason = mw.ustring.lower(args[1])
    		if obj.reason:find('|') then
    			error('reasons cannot contain the pipe character ("|")', 3)
    		end
    	end
    
    	-- Set protection date
    	if args.date then
    		obj.protectionDate = validateDate(args.date, 'protection date')
    	end
    	
    	-- Set banner config
    	do
    		obj.bannerConfig = {}
    		local configTables = {}
    		if cfg.banners[obj.action] then
    			configTables[#configTables + 1] = cfg.banners[obj.action][obj.reason]
    		end
    		if cfg.defaultBanners[obj.action] then
    			configTables[#configTables + 1] = cfg.defaultBanners[obj.action][obj.level]
    			configTables[#configTables + 1] = cfg.defaultBanners[obj.action].default
    		end
    		configTables[#configTables + 1] = cfg.masterBanner
    		for i, field in ipairs(Protection.bannerConfigFields) do
    			for j, t in ipairs(configTables) do
    				if t[field] then
    					obj.bannerConfig[field] = t[field]
    					break
    				end
    			end
    		end
    	end
    	return setmetatable(obj, Protection)
    end
    
    function Protection:isProtected()
    	return self.level ~= '*'
    end
    
    function Protection:isTemporary()
    	return type(self.expiry) == 'number'
    end
    
    function Protection:makeProtectionCategory()
    	local cfg = self._cfg
    	local title = self.title
    	
    	-- Exit if the page is not protected.
    	if not self:isProtected() then
    		return ''
    	end
    	
    	-- Get the expiry key fragment.
    	local expiryFragment
    	if self.expiry == 'indef' then
    		expiryFragment = self.expiry
    	elseif type(self.expiry) == 'number' then
    		expiryFragment = 'temp'
    	end
    
    	-- Get the namespace key fragment.
    	local namespaceFragment = cfg.categoryNamespaceKeys[title.namespace]
    	if not namespaceFragment and title.namespace % 2 == 1 then
    			namespaceFragment = 'talk'
    	end
     
    	-- Define the order that key fragments are tested in. This is done with an
    	-- array of tables containing the value to be tested, along with its
    	-- position in the cfg.protectionCategories table.
    	local order = {
    		{val = expiryFragment,    keypos = 1},
    		{val = namespaceFragment, keypos = 2},
    		{val = self.reason,       keypos = 3},
    		{val = self.level,        keypos = 4},
    		{val = self.action,       keypos = 5}
    	}
    
    	--[[
    	-- The old protection templates used an ad-hoc protection category system,
    	-- with some templates prioritising namespaces in their categories, and
    	-- others prioritising the protection reason. To emulate this in this module
    	-- we use the config table cfg.reasonsWithNamespacePriority to set the
    	-- reasons for which namespaces have priority over protection reason.
    	-- If we are dealing with one of those reasons, move the namespace table to
    	-- the end of the order table, i.e. give it highest priority. If not, the
    	-- reason should have highest priority, so move that to the end of the table
    	-- instead.
    	--]]
    	table.insert(order, table.remove(order, self.reason and cfg.reasonsWithNamespacePriority[self.reason] and 2 or 3))
     
    	--[[
    	-- Define the attempt order. Inactive subtables (subtables with nil "value"
    	-- fields) are moved to the end, where they will later be given the key
    	-- "all". This is to cut down on the number of table lookups in
    	-- cfg.protectionCategories, which grows exponentially with the number of
    	-- non-nil keys. We keep track of the number of active subtables with the
    	-- noActive parameter.
    	--]]
    	local noActive, attemptOrder
    	do
    		local active, inactive = {}, {}
    		for i, t in ipairs(order) do
    			if t.val then
    				active[#active + 1] = t
    			else
    				inactive[#inactive + 1] = t
    			end
    		end
    		noActive = #active
    		attemptOrder = active
    		for i, t in ipairs(inactive) do
    			attemptOrder[#attemptOrder + 1] = t
    		end
    	end
     
    	--[[
    	-- Check increasingly generic key combinations until we find a match. If a
    	-- specific category exists for the combination of key fragments we are
    	-- given, that match will be found first. If not, we keep trying different
    	-- key fragment combinations until we match using the key
    	-- "all-all-all-all-all".
    	--
    	-- To generate the keys, we index the key subtables using a binary matrix
    	-- with indexes i and j. j is only calculated up to the number of active
    	-- subtables. For example, if there were three active subtables, the matrix
    	-- would look like this, with 0 corresponding to the key fragment "all", and
    	-- 1 corresponding to other key fragments.
    	-- 
    	--   j 1  2  3
    	-- i  
    	-- 1   1  1  1
    	-- 2   0  1  1
    	-- 3   1  0  1
    	-- 4   0  0  1
    	-- 5   1  1  0
    	-- 6   0  1  0
    	-- 7   1  0  0
    	-- 8   0  0  0
    	-- 
    	-- Values of j higher than the number of active subtables are set
    	-- to the string "all".
    	--
    	-- A key for cfg.protectionCategories is constructed for each value of i.
    	-- The position of the value in the key is determined by the keypos field in
    	-- each subtable.
    	--]]
    	local cats = cfg.protectionCategories
    	for i = 1, 2^noActive do
    		local key = {}
    		for j, t in ipairs(attemptOrder) do
    			if j > noActive then
    				key[t.keypos] = 'all'
    			else
    				local quotient = i / 2 ^ (j - 1)
    				quotient = math.ceil(quotient)
    				if quotient % 2 == 1 then
    					key[t.keypos] = t.val
    				else
    					key[t.keypos] = 'all'
    				end
    			end
    		end
    		key = table.concat(key, '|')
    		local attempt = cats[key]
    		if attempt then
    			return makeCategoryLink(attempt, title.text)
    		end
    	end
    	return ''
    end
    
    function Protection:isIncorrect()
    	local expiry = self.expiry
    	return not self:isProtected()
    		or type(expiry) == 'number' and expiry < os.time()
    end
    
    function Protection:isTemplateProtectedNonTemplate()
    	local action, namespace = self.action, self.title.namespace
    	return self.level == 'templateeditor'
    		and (
    			(action ~= 'edit' and action ~= 'move')
    			or (namespace ~= 10 and namespace ~= 828)
    		)
    end
    
    function Protection:makeCategoryLinks()
    	local msg = self._cfg.msg
    	local ret = { self:makeProtectionCategory() }
    	if self:isIncorrect() then
    		ret[#ret + 1] = makeCategoryLink(
    			msg['tracking-category-incorrect'],
    			self.title.text
    		)
    	end
    	if self:isTemplateProtectedNonTemplate() then
    		ret[#ret + 1] = makeCategoryLink(
    			msg['tracking-category-template'],
    			self.title.text
    		)
    	end
    	return table.concat(ret)
    end
    
    --------------------------------------------------------------------------------
    -- Blurb class
    --------------------------------------------------------------------------------
    
    local Blurb = {}
    Blurb.__index = Blurb
    
    Blurb.bannerTextFields = {
    	text = true,
    	explanation = true,
    	tooltip = true,
    	alt = true,
    	link = true
    }
    
    function Blurb.new(protectionObj, args, cfg)
    	return setmetatable({
    		_cfg = cfg,
    		_protectionObj = protectionObj,
    		_args = args
    	}, Blurb)
    end
    
    -- Private methods --
    
    function Blurb:_formatDate(num)
    	-- Formats a Unix timestamp into dd Month, YYYY format.
    	lang = lang or mw.language.getContentLanguage()
    	local success, date = pcall(
    		lang.formatDate,
    		lang,
    		self._cfg.msg['expiry-date-format'] or 'j F Y',
    		'@' .. tostring(num)
    	)
    	if success then
    		return date
    	end
    end
    
    function Blurb:_getExpandedMessage(msgKey)
    	return self:_substituteParameters(self._cfg.msg[msgKey])
    end
    
    function Blurb:_substituteParameters(msg)
    	if not self._params then
    		local parameterFuncs = {}
    
    		parameterFuncs.CURRENTVERSION     = self._makeCurrentVersionParameter
    		parameterFuncs.EDITREQUEST        = self._makeEditRequestParameter
    		parameterFuncs.EXPIRY             = self._makeExpiryParameter
    		parameterFuncs.EXPLANATIONBLURB   = self._makeExplanationBlurbParameter
    		parameterFuncs.IMAGELINK          = self._makeImageLinkParameter
    		parameterFuncs.INTROBLURB         = self._makeIntroBlurbParameter
    		parameterFuncs.INTROFRAGMENT      = self._makeIntroFragmentParameter
    		parameterFuncs.PAGETYPE           = self._makePagetypeParameter
    		parameterFuncs.PROTECTIONBLURB    = self._makeProtectionBlurbParameter
    		parameterFuncs.PROTECTIONDATE     = self._makeProtectionDateParameter
    		parameterFuncs.PROTECTIONLEVEL    = self._makeProtectionLevelParameter
    		parameterFuncs.PROTECTIONLOG      = self._makeProtectionLogParameter
    		parameterFuncs.TALKPAGE           = self._makeTalkPageParameter
    		parameterFuncs.TOOLTIPBLURB       = self._makeTooltipBlurbParameter
    		parameterFuncs.TOOLTIPFRAGMENT    = self._makeTooltipFragmentParameter
    		parameterFuncs.VANDAL             = self._makeVandalTemplateParameter
    		
    		self._params = setmetatable({}, {
    			__index = function (t, k)
    				local param
    				if parameterFuncs[k] then
    					param = parameterFuncs[k](self)
    				end
    				param = param or ''
    				t[k] = param
    				return param
    			end
    		})
    	end
    	
    	msg = msg:gsub('${(%u+)}', self._params)
    	return msg
    end
    
    function Blurb:_makeCurrentVersionParameter()
    	-- A link to the page history or the move log, depending on the kind of
    	-- protection.
    	local pagename = self._protectionObj.title.prefixedText
    	if self._protectionObj.action == 'move' then
    		-- We need the move log link.
    		return makeFullUrl(
    			'Special:Log',
    			{type = 'move', page = pagename},
    			self:_getExpandedMessage('current-version-move-display')
    		)
    	else
    		-- We need the history link.
    		return makeFullUrl(
    			pagename,
    			{action = 'history'},
    			self:_getExpandedMessage('current-version-edit-display')
    		)
    	end
    end
    
    function Blurb:_makeEditRequestParameter()
    	local mEditRequest = require('Module:Submit an edit request')
    	local action = self._protectionObj.action
    	local level = self._protectionObj.level
    	
    	-- Get the edit request type.
    	local requestType
    	if action == 'edit' then
    		if level == 'autoconfirmed' then
    			requestType = 'semi'
    		elseif level == 'extendedconfirmed' then
    			requestType = 'extended'
    		elseif level == 'templateeditor' then
    			requestType = 'template'
    		end
    	end
    	requestType = requestType or 'full'
    	
    	-- Get the display value.
    	local display = self:_getExpandedMessage('edit-request-display')
    
    	return mEditRequest._link{type = requestType, display = display}
    end
    
    function Blurb:_makeExpiryParameter()
    	local expiry = self._protectionObj.expiry
    	if type(expiry) == 'number' then
    		return self:_formatDate(expiry)
    	else
    		return expiry
    	end
    end
    
    function Blurb:_makeExplanationBlurbParameter()
    	-- Cover special cases first.
    	if self._protectionObj.title.namespace == 8 then
    		-- MediaWiki namespace
    		return self:_getExpandedMessage('explanation-blurb-nounprotect')
    	end
    
    	-- Get explanation blurb table keys
    	local action = self._protectionObj.action
    	local level = self._protectionObj.level
    	local talkKey = self._protectionObj.title.isTalkPage and 'talk' or 'subject'
    
    	-- Find the message in the explanation blurb table and substitute any
    	-- parameters.
    	local explanations = self._cfg.explanationBlurbs
    	local msg
    	if explanations[action][level] and explanations[action][level][talkKey] then
    		msg = explanations[action][level][talkKey]
    	elseif explanations[action][level] and explanations[action][level].default then
    		msg = explanations[action][level].default
    	elseif explanations[action].default and explanations[action].default[talkKey] then
    		msg = explanations[action].default[talkKey]
    	elseif explanations[action].default and explanations[action].default.default then
    		msg = explanations[action].default.default
    	else
    		error(string.format(
    			'could not find explanation blurb for action "%s", level "%s" and talk key "%s"',
    			action,
    			level,
    			talkKey
    		), 8)
    	end
    	return self:_substituteParameters(msg)
    end
    
    function Blurb:_makeImageLinkParameter()
    	local imageLinks = self._cfg.imageLinks
    	local action = self._protectionObj.action
    	local level = self._protectionObj.level
    	local msg
    	if imageLinks[action][level] then
    		msg = imageLinks[action][level]
    	elseif imageLinks[action].default then
    		msg = imageLinks[action].default
    	else
    		msg = imageLinks.edit.default
    	end
    	return self:_substituteParameters(msg)
    end
    
    function Blurb:_makeIntroBlurbParameter()
    	if self._protectionObj:isTemporary() then
    		return self:_getExpandedMessage('intro-blurb-expiry')
    	else
    		return self:_getExpandedMessage('intro-blurb-noexpiry')
    	end
    end
    
    function Blurb:_makeIntroFragmentParameter()
    	if self._protectionObj:isTemporary() then
    		return self:_getExpandedMessage('intro-fragment-expiry')
    	else
    		return self:_getExpandedMessage('intro-fragment-noexpiry')
    	end
    end
    
    function Blurb:_makePagetypeParameter()
    	local pagetypes = self._cfg.pagetypes
    	return pagetypes[self._protectionObj.title.namespace]
    		or pagetypes.default
    		or error('no default pagetype defined', 8)
    end
    
    function Blurb:_makeProtectionBlurbParameter()
    	local protectionBlurbs = self._cfg.protectionBlurbs
    	local action = self._protectionObj.action
    	local level = self._protectionObj.level
    	local msg
    	if protectionBlurbs[action][level] then
    		msg = protectionBlurbs[action][level]
    	elseif protectionBlurbs[action].default then
    		msg = protectionBlurbs[action].default
    	elseif protectionBlurbs.edit.default then
    		msg = protectionBlurbs.edit.default
    	else
    		error('no protection blurb defined for protectionBlurbs.edit.default', 8)
    	end
    	return self:_substituteParameters(msg)
    end
    
    function Blurb:_makeProtectionDateParameter()
    	local protectionDate = self._protectionObj.protectionDate
    	if type(protectionDate) == 'number' then
    		return self:_formatDate(protectionDate)
    	else
    		return protectionDate
    	end
    end
    
    function Blurb:_makeProtectionLevelParameter()
    	local protectionLevels = self._cfg.protectionLevels
    	local action = self._protectionObj.action
    	local level = self._protectionObj.level
    	local msg
    	if protectionLevels[action][level] then
    		msg = protectionLevels[action][level]
    	elseif protectionLevels[action].default then
    		msg = protectionLevels[action].default
    	elseif protectionLevels.edit.default then
    		msg = protectionLevels.edit.default
    	else
    		error('no protection level defined for protectionLevels.edit.default', 8)
    	end
    	return self:_substituteParameters(msg)
    end
    
    function Blurb:_makeProtectionLogParameter()
    	local pagename = self._protectionObj.title.prefixedText
    	if self._protectionObj.action == 'autoreview' then
    		-- We need the pending changes log.
    		return makeFullUrl(
    			'Special:Log',
    			{type = 'stable', page = pagename},
    			self:_getExpandedMessage('pc-log-display')
    		)
    	else
    		-- We need the protection log.
    		return makeFullUrl(
    			'Special:Log',
    			{type = 'protect', page = pagename},
    			self:_getExpandedMessage('protection-log-display')
    		)
    	end
    end
    
    function Blurb:_makeTalkPageParameter()
    	return string.format(
    		'[[%s:%s#%s|%s]]',
    		mw.site.namespaces[self._protectionObj.title.namespace].talk.name,
    		self._protectionObj.title.text,
    		self._args.section or 'top',
    		self:_getExpandedMessage('talk-page-link-display')
    	)
    end
    
    function Blurb:_makeTooltipBlurbParameter()
    	if self._protectionObj:isTemporary() then
    		return self:_getExpandedMessage('tooltip-blurb-expiry')
    	else
    		return self:_getExpandedMessage('tooltip-blurb-noexpiry')
    	end
    end
    
    function Blurb:_makeTooltipFragmentParameter()
    	if self._protectionObj:isTemporary() then
    		return self:_getExpandedMessage('tooltip-fragment-expiry')
    	else
    		return self:_getExpandedMessage('tooltip-fragment-noexpiry')
    	end
    end
    
    function Blurb:_makeVandalTemplateParameter()
    	return require('Module:Vandal-m')._main{
    		self._args.user or self._protectionObj.title.baseText
    	}
    end
    
    -- Public methods --
    
    function Blurb:makeBannerText(key)
    	-- Validate input.
    	if not key or not Blurb.bannerTextFields[key] then
    		error(string.format(
    			'"%s" is not a valid banner config field',
    			tostring(key)
    		), 2)
    	end
    
    	-- Generate the text.
    	local msg = self._protectionObj.bannerConfig[key]
    	if type(msg) == 'string' then
    		return self:_substituteParameters(msg)
    	elseif type(msg) == 'function' then
    		msg = msg(self._protectionObj, self._args)
    		if type(msg) ~= 'string' then
    			error(string.format(
    				'bad output from banner config function with key "%s"'
    					.. ' (expected string, got %s)',
    				tostring(key),
    				type(msg)
    			), 4)
    		end
    		return self:_substituteParameters(msg)
    	end
    end
    
    --------------------------------------------------------------------------------
    -- BannerTemplate class
    --------------------------------------------------------------------------------
    
    local BannerTemplate = {}
    BannerTemplate.__index = BannerTemplate
    
    function BannerTemplate.new(protectionObj, cfg)
    	local obj = {}
    	obj._cfg = cfg
    
    	-- Set the image filename.
    	local imageFilename = protectionObj.bannerConfig.image
    	if imageFilename then
    		obj._imageFilename = imageFilename
    	else
    		-- If an image filename isn't specified explicitly in the banner config,
    		-- generate it from the protection status and the namespace.
    		local action = protectionObj.action
    		local level = protectionObj.level
    		local namespace = protectionObj.title.namespace
    		local reason = protectionObj.reason
    		
    		-- Deal with special cases first.
    		if (
    			namespace == 10
    			or namespace == 828
    			or reason and obj._cfg.indefImageReasons[reason]
    			)
    			and action == 'edit'
    			and level == 'sysop'
    			and not protectionObj:isTemporary()
    		then
    			-- Fully protected modules and templates get the special red "indef"
    			-- padlock.
    			obj._imageFilename = obj._cfg.msg['image-filename-indef']
    		else
    			-- Deal with regular protection types.
    			local images = obj._cfg.images
    			if images[action] then
    				if images[action][level] then
    					obj._imageFilename = images[action][level]
    				elseif images[action].default then
    					obj._imageFilename = images[action].default
    				end
    			end
    		end
    	end
    	return setmetatable(obj, BannerTemplate)
    end
    
    function BannerTemplate:renderImage()
    	local filename = self._imageFilename
    		or self._cfg.msg['image-filename-default']
    		or 'Transparent.gif'
    	return makeFileLink{
    		file = filename,
    		size = (self.imageWidth or 20) .. 'px',
    		alt = self._imageAlt,
    		link = self._imageLink,
    		caption = self.imageCaption
    	}
    end
    
    --------------------------------------------------------------------------------
    -- Banner class
    --------------------------------------------------------------------------------
    
    local Banner = setmetatable({}, BannerTemplate)
    Banner.__index = Banner
    
    function Banner.new(protectionObj, blurbObj, cfg)
    	local obj = BannerTemplate.new(protectionObj, cfg) -- This doesn't need the blurb.
    	obj.imageWidth = 40
    	obj.imageCaption = blurbObj:makeBannerText('alt') -- Large banners use the alt text for the tooltip.
    	obj._reasonText = blurbObj:makeBannerText('text')
    	obj._explanationText = blurbObj:makeBannerText('explanation')
    	obj._page = protectionObj.title.prefixedText -- Only makes a difference in testing.
    	return setmetatable(obj, Banner)
    end
    
    function Banner:__tostring()
    	-- Renders the banner.
    	makeMessageBox = makeMessageBox or require('Module:Message box').main
    	local reasonText = self._reasonText or error('no reason text set', 2)
    	local explanationText = self._explanationText
    	local mbargs = {
    		page = self._page,
    		type = 'protection',
    		image = self:renderImage(),
    		text = string.format(
    			"'''%s'''%s",
    			reasonText,
    			explanationText and '<br />' .. explanationText or ''
    		)
    	}
    	return makeMessageBox('mbox', mbargs)
    end
    
    --------------------------------------------------------------------------------
    -- Padlock class
    --------------------------------------------------------------------------------
    
    local Padlock = setmetatable({}, BannerTemplate)
    Padlock.__index = Padlock
    
    function Padlock.new(protectionObj, blurbObj, cfg)
    	local obj = BannerTemplate.new(protectionObj, cfg) -- This doesn't need the blurb.
    	obj.imageWidth = 20
    	obj.imageCaption = blurbObj:makeBannerText('tooltip')
    	obj._imageAlt = blurbObj:makeBannerText('alt')
    	obj._imageLink = blurbObj:makeBannerText('link')
    	obj._indicatorName = cfg.padlockIndicatorNames[protectionObj.action]
    		or cfg.padlockIndicatorNames.default
    		or 'pp-default'
    	return setmetatable(obj, Padlock)
    end
    
    function Padlock:__tostring()
    	local frame = mw.getCurrentFrame()
    	-- The nowiki tag helps prevent whitespace at the top of articles.
    	return frame:extensionTag{name = 'nowiki'} .. frame:extensionTag{
    		name = 'indicator',
    		args = {name = self._indicatorName},
    		content = self:renderImage()
    	}
    end
    
    --------------------------------------------------------------------------------
    -- Exports
    --------------------------------------------------------------------------------
    
    local p = {}
    
    function p._exportClasses()
    	-- This is used for testing purposes.
    	return {
    		Protection = Protection,
    		Blurb = Blurb,
    		BannerTemplate = BannerTemplate,
    		Banner = Banner,
    		Padlock = Padlock,
    	}
    end
    
    function p._main(args, cfg, title)
    	args = args or {}
    	cfg = cfg or require(CONFIG_MODULE)
    
    	local protectionObj = Protection.new(args, cfg, title)
    
    	local ret = {}
    
    	-- If a page's edit protection is equally or more restrictive than its
    	-- protection from some other action, then don't bother displaying anything
    	-- for the other action (except categories).
    	if protectionObj.action == 'edit' or
    		args.demolevel or
    		not getReachableNodes(
    			cfg.hierarchy,
    			protectionObj.level
    		)[effectiveProtectionLevel('edit', protectionObj.title)]
    	then
    		-- Initialise the blurb object
    		local blurbObj = Blurb.new(protectionObj, args, cfg)
    	
    		-- Render the banner
    		if protectionObj:isProtected() then
    			ret[#ret + 1] = tostring(
    				(yesno(args.small) and Padlock or Banner)
    				.new(protectionObj, blurbObj, cfg)
    			)
    		end
    	end
    
    	-- Render the categories
    	if yesno(args.category) ~= false then
    		ret[#ret + 1] = protectionObj:makeCategoryLinks()
    	end
    	
    	return table.concat(ret)	
    end
    
    function p.main(frame, cfg)
    	cfg = cfg or require(CONFIG_MODULE)
    
    	-- Find default args, if any.
    	local parent = frame.getParent and frame:getParent()
    	local defaultArgs = parent and cfg.wrappers[parent:getTitle():gsub('/sandbox$', '')]
    
    	-- Find user args, and use the parent frame if we are being called from a
    	-- wrapper template.
    	getArgs = getArgs or require('Module:Arguments').getArgs
    	local userArgs = getArgs(frame, {
    		parentOnly = defaultArgs,
    		frameOnly = not defaultArgs
    	})
    
    	-- Build the args table. User-specified args overwrite default args.
    	local args = {}
    	for k, v in pairs(defaultArgs or {}) do
    		args[k] = v
    	end
    	for k, v in pairs(userArgs) do
    		args[k] = v
    	end
    	return p._main(args, cfg)
    end
    
    return p