Add all BENNC message types with unit tests

src/messages/basic.ts

@@ -0,0 +1,41 @@
+import { decrypt, encrypt } from 'romulus-js'
+import { DEFAULT_KEY, MessageTypes } from '../common'
+import { numberToUint16BE } from '../utilities/number'
+import { packOutgoingPacket } from './packet'
+
+const MESSAGE_TYPE = numberToUint16BE(MessageTypes.Basic)
+
+export interface BasicMessage {
+  message: string
+  success?: boolean
+}
+
+/**
+ * Create an outgoing basic message (0x0001) packet.
+ * @param properties The properties for the message.
+ * @param key The key to encrypt the data with.
+ * @returns An outgoing basic message (0x0001) packet.
+ */
+export function packBasicMessage (properties: BasicMessage, key: Buffer = DEFAULT_KEY): Buffer {
+  const message = Buffer.from(properties.message, 'utf-8')
+  const data = encrypt(message, MESSAGE_TYPE, key)
+  return packOutgoingPacket({
+    messageType: MESSAGE_TYPE,
+    data: data
+  })
+}
+
+/**
+ * Unpack the data section of an incoming basic message (0x0001) message.
+ * @param data The data section of an incoming basic message (0x0001) message.
+ * @param key The key to decrypt the data with.
+ * @returns An unpacked basic message (0x0001) message.
+ */
+export function unpackBasicMessage (data: Buffer, key: Buffer = DEFAULT_KEY): BasicMessage {
+  const message = decrypt(data, MESSAGE_TYPE, key)
+
+  return {
+    message: message.plaintext.toString(),
+    success: message.success
+  }
+}