Add rpc request/response for handshake

mtproto/rpc/rpc_handshake_request.go

@@ -0,0 +1,47 @@
+package rpc
+
+import "bytes"
+
+const (
+	rpcHandshakeTagLength       = 4
+	rpcHandshakeFlagsLength     = 4
+	rpcHandshakeSenderPIDLength = 12
+	rpcHandshakePeerPIDLength   = rpcHandshakeSenderPIDLength
+
+	rpcHandshakeRequestLength = rpcHandshakeTagLength + rpcHandshakeFlagsLength +
+		rpcHandshakeSenderPIDLength + rpcHandshakePeerPIDLength
+)
+
+var (
+	rpcHandshakeSenderPID [rpcHandshakeSenderPIDLength]byte
+	rpcHandshakePeerPID   [rpcHandshakePeerPIDLength]byte
+
+	rpcHandshakeTag   = [rpcHandshakeTagLength]byte{0xf5, 0xee, 0x82, 0x76}
+	rpcHandshakeFlags = [rpcHandshakeFlagsLength]byte{0x00, 0x00, 0x00, 0x00}
+
+	rpcHandshakeBuffer *bytes.Buffer
+)
+
+type RPCHandshakeRequest struct {
+}
+
+func (r *RPCHandshakeRequest) Bytes() *bytes.Buffer {
+	buf := &bytes.Buffer{}
+	buf.Grow(rpcHandshakeRequestLength)
+
+	buf.Write(rpcHandshakeTag[:])
+	buf.Write(rpcHandshakeFlags[:])
+	buf.Write(rpcHandshakeSenderPID[:])
+	buf.Write(rpcHandshakePeerPID[:])
+
+	return buf
+}
+
+func init() {
+	copy(rpcHandshakeSenderPID[:], "IPIPPRPDTIME")
+	copy(rpcHandshakePeerPID[:], "IPIPPRPDTIME")
+}
+
+func NewRPCHandshakeRequest() *RPCHandshakeRequest {
+	return &RPCHandshakeRequest{}
+}