anti_respawn_on_reconnect.sp

#include <sourcemod>
#include <sdktools> /** ForcePlayerSuicide */

public Plugin myinfo = {
	name = "Anti-respawn on reconnect",
	author = "Kipras Melnikovas (https://kipras.org) <[email protected]>",
	description = "Disallow clients from respawning after being spawned and reconnecting",
	version = "0.1.0",
	url = "https://kipras.org"
};

public void OnPluginStart() {
	HookEvent("round_prestart", Event_RoundPreStart);
	HookEvent("player_spawned", Event_PlayerSpawned);
}

/**
 * Contains steam ids of clients (as strings) that have been spawned this round.
 *
 * The `ArrayList` is documented here: https://sm.alliedmods.net/new-api/adt_array/ArrayList
*/
public ArrayList g_spawnedClientsThisRound;

/**
 * Clears the spawned client array before the round starts.
 *
 * https://wiki.alliedmods.net/Counter-Strike:_Global_Offensive_Events#round_prestart
*/
public void Event_RoundPreStart(Event event, const char[] eventName, bool dontBroadcast) {
	ClearArray(g_spawnedClientsThisRound);
}

/**
 * Kills the client if it has already been spawned,
 * or adds it to the spawned client array.
 *
 * https://wiki.alliedmods.net/Counter-Strike:_Global_Offensive_Events#player_spawned
*/
public void Event_PlayerSpawned(Event event, const char[] eventName, bool dontBroadcast) {
	/** used to get the `clientIndex` */
	int clientUserId = GetEventInt(event, "userid");

	/** used to get the `clientSteamId` & for `ForcePlayerSuicide` */
	int clientIndex = GetClientOfUserId(clientUserId);

	/** used for storing in the array */
	const int maxlen = 32;
	char clientSteamId[maxlen];
	GetClientAuthId(clientIndex, AuthId_SteamID64, clientSteamId, maxlen); /** TODO - might not succeed */

	bool hasAlreadyBeenSpawnedThisRound = (FindStringInArray(g_spawnedClientsThisRound, clientSteamId) != -1);

	if (hasAlreadyBeenSpawnedThisRound) {
		ForcePlayerSuicide(clientIndex);
		/** TODO message the killed client? */
	} else {
		PushArrayString(g_spawnedClientsThisRound, clientSteamId);
	}
}