add ssh destination to connection config

internal/cli/config/cluster.go

@@ -6,6 +6,6 @@ type Cluster struct {
 	Name     string              `toml:"-"`
 	Machines []MachineConnection `toml:"machines"`
 	Secret   secret.Secret       `toml:"secret"`
-	// UserKey is the user's WireGuard private key used to connect to cluster machines.
+	// UserPrivateKey is the user's WireGuard private key used to connect to cluster machines.
-	UserKey secret.Secret `toml:"user_key"`
+	UserPrivateKey secret.Secret `toml:"user_private_key"`
 }

internal/cli/config/machine.go

@@ -1,10 +1,45 @@
 package config
 
 import (
+	"net"
+	"strconv"
+	"strings"
 	"uncloud/internal/secret"
 )
 
+const (
+	DefaultSSHUser = "root"
+	DefaultSSHPort = 22
+)
+
 type MachineConnection struct {
-	Host      string        `toml:"host"`
+	SSH       SSHDestination `toml:"ssh,omitempty"`
-	PublicKey secret.Secret `toml:"public_key"`
+	Host      string         `toml:"host,omitempty"`
+	PublicKey secret.Secret  `toml:"public_key,omitempty"`
+}
+
+type SSHDestination string
+
+func NewSSHDestination(user, host string, port int) SSHDestination {
+	dst := host
+	if port != 0 && port != DefaultSSHPort {
+		dst = net.JoinHostPort(host, strconv.Itoa(port))
+	}
+	if user == "" {
+		user = DefaultSSHUser
+	}
+	dst = user + "@" + dst
+	return SSHDestination(dst)
+}
+
+func (d SSHDestination) Parse() (user string, host string, port int, err error) {
+	if strings.Contains(string(d), "@") {
+		user, host, _ = strings.Cut(string(d), "@")
+	}
+	h, p, sErr := net.SplitHostPort(host)
+	if sErr == nil {
+		host = h
+		port, err = strconv.Atoi(p)
+	}
+	return
 }