refactor: move api, client, compose packages to pkg

pkg/client/user.go

@@ -0,0 +1,49 @@
+package client
+
+import (
+	"fmt"
+	"github.com/psviderski/uncloud/internal/machine/network"
+	"github.com/psviderski/uncloud/internal/secret"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+	"net/netip"
+)
+
+type User struct {
+	privateKey wgtypes.Key
+}
+
+func NewUser(privateKey secret.Secret) (*User, error) {
+	var (
+		wgKey wgtypes.Key
+		err   error
+	)
+	if privateKey == nil {
+		wgKey, err = wgtypes.GeneratePrivateKey()
+		if err != nil {
+			return nil, fmt.Errorf("generate key for user: %w", err)
+		}
+		privateKey = wgKey[:]
+	} else {
+		wgKey, err = wgtypes.NewKey(privateKey)
+		if err != nil {
+			return nil, fmt.Errorf("invalid key: %w", err)
+		}
+		privateKey = wgKey[:]
+	}
+	return &User{
+		privateKey: wgKey,
+	}, nil
+}
+
+func (u *User) PrivateKey() secret.Secret {
+	return u.privateKey[:]
+}
+
+func (u *User) PublicKey() secret.Secret {
+	pubKey := u.privateKey.PublicKey()
+	return pubKey[:]
+}
+
+func (u *User) ManagementIP() netip.Addr {
+	return network.ManagementIP(u.PublicKey())
+}