Add host-validated multiplayer shop purchases

network/network_shop_protocol.gd

@@ -0,0 +1,115 @@
+class_name NetworkShopProtocol
+extends RefCounted
+
+const CAPABILITY: StringName = &"shop_v1"
+const RELIABLE_CHANNEL: int = NetworkProtocol.SHOP_RELIABLE_CHANNEL
+const MAX_ID_LENGTH: int = 96
+const MAX_MESSAGE_LENGTH: int = 160
+const MAX_QUANTITY: int = 99
+
+enum ProductCategory {
+	SUPPLY,
+	ROD,
+	REEL_SPEED_UPGRADE,
+	BARRIER_POWER_UPGRADE,
+	COOLER_CAPACITY_UPGRADE,
+}
+
+
+static func validate_request(data: Variant) -> String:
+	if typeof(data) != TYPE_DICTIONARY:
+		return "Purchase could not be completed."
+	var payload: Dictionary = data
+	for key: String in [
+		"request_id",
+		"session_id",
+		"shop_id",
+		"product_id",
+		"category",
+		"quantity",
+		"wallet_balance",
+		"current_state",
+	]:
+		if not payload.has(key):
+			return "Purchase could not be completed."
+	if (
+		typeof(payload["request_id"]) != TYPE_STRING
+		or typeof(payload["session_id"]) != TYPE_STRING
+		or typeof(payload["shop_id"]) not in [TYPE_STRING, TYPE_STRING_NAME]
+		or typeof(payload["product_id"]) not in [
+			TYPE_STRING, TYPE_STRING_NAME
+		]
+		or typeof(payload["category"]) != TYPE_INT
+		or typeof(payload["quantity"]) != TYPE_INT
+		or typeof(payload["wallet_balance"]) != TYPE_INT
+		or typeof(payload["current_state"]) != TYPE_INT
+	):
+		return "Purchase could not be completed."
+	var request_id: String = payload["request_id"]
+	var session_id: String = payload["session_id"]
+	var shop_id: String = str(payload["shop_id"])
+	var product_id: String = str(payload["product_id"])
+	var category: int = payload["category"]
+	var quantity: int = payload["quantity"]
+	var wallet_balance: int = payload["wallet_balance"]
+	var current_state: int = payload["current_state"]
+	if (
+		request_id.is_empty()
+		or request_id.length() > MAX_ID_LENGTH
+		or session_id.is_empty()
+		or session_id.length() > MAX_ID_LENGTH
+		or shop_id.is_empty()
+		or shop_id.length() > MAX_ID_LENGTH
+		or product_id.is_empty()
+		or product_id.length() > MAX_ID_LENGTH
+		or category < 0
+		or category >= ProductCategory.size()
+		or quantity < 1
+		or quantity > MAX_QUANTITY
+		or wallet_balance < 0
+		or current_state < 0
+	):
+		return "Purchase could not be completed."
+	return ""
+
+
+static func validate_result(data: Variant) -> bool:
+	if typeof(data) != TYPE_DICTIONARY:
+		return false
+	var payload: Dictionary = data
+	return (
+		_valid_id(payload.get("result_id"))
+		and _valid_id(payload.get("request_id"))
+		and typeof(payload.get("session_id")) == TYPE_STRING
+		and typeof(payload.get("target_peer_id")) == TYPE_INT
+		and typeof(payload.get("accepted")) == TYPE_BOOL
+		and typeof(payload.get("product_id")) in [
+			TYPE_STRING, TYPE_STRING_NAME
+		]
+		and not str(payload["product_id"]).is_empty()
+		and str(payload["product_id"]).length() <= MAX_ID_LENGTH
+		and typeof(payload.get("category")) == TYPE_INT
+		and int(payload["category"]) >= 0
+		and int(payload["category"]) < ProductCategory.size()
+		and typeof(payload.get("quantity")) == TYPE_INT
+		and int(payload["quantity"]) >= 0
+		and int(payload["quantity"]) <= MAX_QUANTITY
+		and typeof(payload.get("total_cost")) == TYPE_INT
+		and int(payload["total_cost"]) >= 0
+		and typeof(payload.get("expected_wallet")) == TYPE_INT
+		and int(payload["expected_wallet"]) >= 0
+		and typeof(payload.get("expected_state")) == TYPE_INT
+		and int(payload["expected_state"]) >= 0
+		and typeof(payload.get("resulting_state")) == TYPE_INT
+		and int(payload["resulting_state"]) >= 0
+		and typeof(payload.get("message")) == TYPE_STRING
+		and str(payload["message"]).length() <= MAX_MESSAGE_LENGTH
+	)
+
+
+static func _valid_id(value: Variant) -> bool:
+	return (
+		typeof(value) == TYPE_STRING
+		and not str(value).is_empty()
+		and str(value).length() <= MAX_ID_LENGTH
+	)