Merge pull request #12036 from kevinz000/electrochromatic_windows

Electrochromatic (dim-on-demand) windows

code/controllers/subsystem/mapping.dm

@@ -42,6 +42,13 @@ SUBSYSTEM_DEF(mapping)
 
 	var/stat_map_name = "Loading..."
 
+	/// Lookup list for random generated IDs.
+	var/list/random_generated_ids_by_original = list()
+	/// next id for separating obfuscated ids.
+	var/obfuscation_next_id = 1
+	/// "secret" key
+	var/obfuscation_secret
+
 //dlete dis once #39770 is resolved
 /datum/controller/subsystem/mapping/proc/HACK_LoadMapConfig()
 	if(!config)
@@ -52,6 +59,10 @@ SUBSYSTEM_DEF(mapping)
 #endif
 	stat_map_name = config.map_name
 
+/datum/controller/subsystem/mapping/PreInit()
+	if(!obfuscation_secret)
+		obfuscation_secret = md5(GUID())		//HAH! Guess this!
+
 /datum/controller/subsystem/mapping/Initialize(timeofday)
 	HACK_LoadMapConfig()
 	if(initialized)
@@ -568,3 +579,15 @@ GLOBAL_LIST_EMPTY(the_station_areas)
 		LM.load()
 	if(GLOB.stationroom_landmarks.len)
 		seedStation() //I'm sure we can trust everyone not to insert a 1x1 rooms which loads a landmark which loads a landmark which loads a la...
+
+/**
+  * Generates an obfuscated but constant id for an original id for cases where you don't want players codediving for an id.
+  * WARNING: MAKE SURE PLAYERS ARE NOT ABLE TO ACCESS THIS. To save performance, it's just secret + an incrementing number. Very guessable if you know what the secret is.
+  */
+/datum/controller/subsystem/mapping/proc/get_obfuscated_id(original, id_type = "GENERAL")
+	if(!original)
+		return	//no.
+	var/key = "[original]%[id_type]"
+	if(random_generated_ids_by_original[key])
+		return random_generated_ids_by_original[key]
+	. = random_generated_ids_by_original[key] = "[obfuscation_secret]%[obfuscation_next_id++]"