packet: add support for building 3 basic packet types

src/packet.vala

@@ -21,16 +21,25 @@
 using Json;
 
 class Packet : GLib.Object {
+
+	public const int PROTOCOL_VERSION = 5;
+
 	public const string IDENTITY = "kdeconnect.identity";
 	public const string PAIR = "kdeconnect.pair";
 	public const string ENCRYPT = "kdeconnect.encrypt";
 
 	public string pkt_type { get; private set; default = ""; }
+	public int64 id { get; private set; default = 0; }
 	public Json.Object body { get; private set; default = null; }
 
-	private Packet(string type, Json.Object body) {
+	public Packet(string type, Json.Object body, int64 id = 0) {
 		this.pkt_type = type;
 		this.body = body;
+		if (id == 0) {
+			this.id = get_real_time() / 1000;
+		} else {
+			this.id = id;
+		}
 	}
 
 	public static Packet? new_from_data(string data) {
@@ -40,11 +49,12 @@ class Packet : GLib.Object {
 			jp.load_from_data(data, -1);
 			var root_obj = jp.get_root().get_object();
 			var type = root_obj.get_string_member("type");
-			debug("packet type: %s", type);
+			var id = root_obj.get_int_member("id");
 			var body = root_obj.get_object_member("body");
-			// var device_name = body.get_string_member("deviceName");
-			// var port = (uint) body.get_int_member("tcpPort");
-			return new Packet(type, body);
+
+			debug("packet type: %s", type);
+
+			return new Packet(type, body, id);
 		} catch (Error e) {
 			message("failed to parse message: \'%s\', error: %s",
 					data, e.message);
@@ -52,7 +62,61 @@ class Packet : GLib.Object {
 		return null;
 	}
 
-	public string decrypt() {
-		return "";
+	public static Packet new_pair(string key, bool pair = true) {
+		var builder = new Json.Builder();
+		builder.begin_object();
+		builder.set_member_name("pair");
+		builder.add_boolean_value(pair);
+		builder.set_member_name("publicKey");
+		builder.add_string_value(key);
+		builder.end_object();
+
+		var data_obj = builder.get_root().get_object();
+
+		return new Packet(PAIR, data_obj);
+	}
+
+	public static Packet new_identity(string name,
+									  string device_id,
+									  string[] in_interfaces,
+									  string[] out_interfaces,
+									  string device_type = "desktop") {
+		var builder = new Json.Builder();
+		builder.begin_object();
+		builder.set_member_name("deviceName");
+		builder.add_string_value(name);
+		builder.set_member_name("deviceId");
+		builder.add_string_value(device_id);
+		builder.set_member_name("deviceType");
+		builder.add_string_value(device_type);
+		builder.set_member_name("SupportedIncomingInterfaces");
+		builder.add_string_value(string.joinv(",", in_interfaces));
+		builder.set_member_name("SupportedOutgoingInterfaces");
+		builder.add_string_value(string.joinv(",", out_interfaces));
+		builder.set_member_name("protocolVersion");
+		builder.add_int_value(PROTOCOL_VERSION);
+		builder.end_object();
+
+		var data_obj = builder.get_root().get_object();
+
+		return new Packet(IDENTITY, data_obj);
+	}
+
+	public string to_string() {
+		var gen = new Json.Generator();
+		// root node
+		var root = new Json.Node(Json.NodeType.OBJECT);
+		var root_obj = new Json.Object();
+		root_obj.set_string_member("type", pkt_type);
+		root_obj.set_int_member("id", id);
+		root_obj.set_object_member("body", body);
+		root.set_object(root_obj);
+
+		gen.set_root(root);
+		gen.set_pretty(false);
+
+		var data = gen.to_data(null);
+
+		return data;
 	}
 }