Polaris/code/modules/client/client procs.dm

	////////////
	//SECURITY//
	////////////
#define TOPIC_SPAM_DELAY	4		//4 ticks is about 3/10ths of a second
#define UPLOAD_LIMIT		1048576	//Restricts client uploads to the server to 1MB //Could probably do with being lower.
#define MIN_CLIENT_VERSION	0		//Just an ambiguously low version for now, I don't want to suddenly stop people playing.
									//I would just like the code ready should it ever need to be used.
	/*
	When somebody clicks a link in game, this Topic is called first.
	It does the stuff in this proc and  then is redirected to the Topic() proc for the src=[0xWhatever]
	(if specified in the link). ie locate(hsrc).Topic()

	Such links can be spoofed.

	Because of this certain things MUST be considered whenever adding a Topic() for something:
		- Can it be fed harmful values which could cause runtimes?
		- Is the Topic call an admin-only thing?
		- If so, does it have checks to see if the person who called it (usr.client) is an admin?
		- Are the processes being called by Topic() particularly laggy?
		- If so, is there any protection against somebody spam-clicking a link?
	If you have any  questions about this stuff feel free to ask. ~Carn
	*/
/client/Topic(href, href_list, hsrc)
	if(!usr || usr != mob)	//stops us calling Topic for somebody else's client. Also helps prevent usr=null
		return

	//Reduces spamming of links by dropping calls that happen during the delay period
	if(next_allowed_topic_time > world.time)
		return
	next_allowed_topic_time = world.time + TOPIC_SPAM_DELAY

	//search the href for script injection
	if( findtext(href,"<script",1,0) )
		world.log << "Attempted use of scripts within a topic call, by [src]"
		message_admins("Attempted use of scripts within a topic call, by [src]")
		//del(usr)
		return

	//Admin PM
	if(href_list["priv_msg"])
		var/client/C = locate(href_list["priv_msg"])
		if(ismob(C)) 		//Old stuff can feed-in mobs instead of clients
			var/mob/M = C
			C = M.client
		cmd_admin_pm(C,null)
		return

	//Logs all hrefs
	if(config && config.log_hrefs && href_logfile)
		href_logfile << "<small>[time2text(world.timeofday,"hh:mm")] [src] (usr:[usr])</small> || [hsrc ? "[hsrc] " : ""][href]<br>"

	switch(href_list["_src_"])
		if("holder")	hsrc = usr.client.holder
		if("usr")		hsrc = usr

	if(view_var_Topic(href,href_list,hsrc))	//Until viewvars can be rewritten as datum/admins/Topic()
		return

	..()	//redirect to hsrc.Topic()

/client/proc/handle_spam_prevention(var/message, var/mute_type)
	if(config.automute_on && !holder && src.last_message == message)
		src.last_message_count++
		if(src.last_message_count >= SPAM_TRIGGER_AUTOMUTE)
			src << "\red You have exceeded the spam filter limit for identical messages. An auto-mute was applied."
			cmd_admin_mute(src.mob, mute_type, 1)
			return 1
		if(src.last_message_count >= SPAM_TRIGGER_WARNING)
			src << "\red You are nearing the spam filter limit for identical messages."
			return 0
	else
		last_message = message
		src.last_message_count = 0
		return 0

//This stops files larger than UPLOAD_LIMIT being sent from client to server via input(), client.Import() etc.
/client/AllowUpload(filename, filelength)
	if(filelength > UPLOAD_LIMIT)
		src << "<font color='red'>Error: AllowUpload(): File Upload too large. Upload Limit: [UPLOAD_LIMIT/1024]KiB.</font>"
		return 0
/*	//Don't need this at the moment. But it's here if it's needed later.
	//Helps prevent multiple files being uploaded at once. Or right after eachother.
	var/time_to_wait = fileaccess_timer - world.time
	if(time_to_wait > 0)
		src << "<font color='red'>Error: AllowUpload(): Spam prevention. Please wait [round(time_to_wait/10)] seconds.</font>"
		return 0
	fileaccess_timer = world.time + FTPDELAY	*/
	return 1


	///////////
	//CONNECT//
	///////////
/client/New(TopicData)
	TopicData = null							//Prevent calls to client.Topic from connect

	if(connection != "seeker")					//Invalid connection type.
		return null
	if(byond_version < MIN_CLIENT_VERSION)		//Out of date client.
		return null

	clients += src
	directory[ckey] = src

	//Admin Authorisation
	holder = admin_datums[ckey]
	if(holder)
		admins += src
		holder.owner = src

	. = ..()	//calls mob.Login()

	if( (world.address == address || !address) && !host )
		host = key
		world.update_status()

	if(holder)
		add_admin_verbs()
		admin_memo_show()

	log_client_to_db()

	getFiles('html/search.js','html/panels.css')


	//////////////
	//DISCONNECT//
	//////////////
/client/Del()
	if(holder)
		holder.owner = null
		admins -= src
	directory -= ckey
	clients -= src
	return ..()



/client/proc/log_client_to_db()

	if ( IsGuestKey(src.key) )
		return

	establish_db_connection()
	if(!dbcon.IsConnected())
		return

	var/sql_ckey = sql_sanitize_text(src.ckey)

	var/DBQuery/query = dbcon.NewQuery("SELECT id FROM erro_player WHERE ckey = '[sql_ckey]'")
	query.Execute()
	var/sql_id = 0
	while(query.NextRow())
		sql_id = query.item[1]
		break

	//Just the standard check to see if it's actually a number
	if(sql_id)
		if(istext(sql_id))
			sql_id = text2num(sql_id)
		if(!isnum(sql_id))
			return

	var/admin_rank = "Player"
	if(src.holder)
		admin_rank = src.holder.rank

	var/sql_ip = sql_sanitize_text(src.address)
	var/sql_computerid = sql_sanitize_text(src.computer_id)
	var/sql_admin_rank = sql_sanitize_text(admin_rank)


	if(sql_id)
		//Player already identified previously, we need to just update the 'lastseen', 'ip' and 'computer_id' variables
		var/DBQuery/query_update = dbcon.NewQuery("UPDATE erro_player SET lastseen = Now(), ip = '[sql_ip]', computerid = '[sql_computerid]', lastadminrank = '[sql_admin_rank]' WHERE id = [sql_id]")
		query_update.Execute()
	else
		//New player!! Need to insert all the stuff
		var/DBQuery/query_insert = dbcon.NewQuery("INSERT INTO erro_player (id, ckey, firstseen, lastseen, ip, computerid, lastadminrank) VALUES (null, '[sql_ckey]', Now(), Now(), '[sql_ip]', '[sql_computerid]', '[sql_admin_rank]')")
		query_insert.Execute()

#undef TOPIC_SPAM_DELAY
#undef UPLOAD_LIMIT
#undef MIN_CLIENT_VERSION

//checks if a client is afk
//3000 frames = 5 minutes
/client/proc/is_afk(duration=AFK_THRESHOLD)
	if(inactivity > duration)	return inactivity
	return 0