Add multiplayer item use and session chat

network/network_chat_protocol.gd

@@ -0,0 +1,61 @@
+class_name NetworkChatProtocol
+extends RefCounted
+
+const CAPABILITY: StringName = &"chat_v1"
+const RELIABLE_CHANNEL: int = NetworkProtocol.CHAT_RELIABLE_CHANNEL
+const MAX_VISIBLE_CHARACTERS: int = 300
+const MAX_UTF8_BYTES: int = 1200
+const MAX_HISTORY: int = 100
+const LATE_JOIN_HISTORY: int = 50
+const MAX_ID_LENGTH: int = 96
+
+enum Kind { PLAYER, SYSTEM }
+
+
+static func sanitize_body(value: Variant) -> String:
+	if typeof(value) != TYPE_STRING:
+		return ""
+	var result: String = str(value).replace("\r", " ").replace("\n", " ")
+	result = result.replace("\t", " ").strip_edges()
+	if result.is_empty() or result.length() > MAX_VISIBLE_CHARACTERS:
+		return ""
+	if result.to_utf8_buffer().size() > MAX_UTF8_BYTES:
+		return ""
+	for index: int in result.length():
+		var codepoint: int = result.unicode_at(index)
+		if codepoint < 32 or codepoint == 127:
+			return ""
+	return result
+
+
+static func validate_request(data: Variant) -> bool:
+	return (
+		typeof(data) == TYPE_DICTIONARY
+		and _valid_id(data.get("request_id"))
+		and _valid_id(data.get("session_id"))
+		and not sanitize_body(data.get("body")).is_empty()
+	)
+
+
+static func validate_message(data: Variant) -> bool:
+	return (
+		typeof(data) == TYPE_DICTIONARY
+		and _valid_id(data.get("message_id"))
+		and _valid_id(data.get("session_id"))
+		and typeof(data.get("sequence")) == TYPE_INT
+		and int(data["sequence"]) >= 0
+		and typeof(data.get("kind")) == TYPE_INT
+		and int(data["kind"]) in [Kind.PLAYER, Kind.SYSTEM]
+		and typeof(data.get("sender_peer_id")) == TYPE_INT
+		and typeof(data.get("sender_display_name")) == TYPE_STRING
+		and str(data["sender_display_name"]).length() <= 24
+		and not sanitize_body(data.get("body")).is_empty()
+	)
+
+
+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
+	)