init

internal/services/config.go

@@ -0,0 +1,130 @@
+package services
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"slices"
+)
+
+type Server struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+	Host string `json:"host"`
+}
+
+type Config struct {
+	Servers          []Server `json:"servers"`
+	SelectedServerID string   `json:"selectedServerId"`
+}
+
+type ConfigService struct {
+	path   string
+	config Config
+}
+
+func NewConfigService() (*ConfigService, error) {
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return nil, fmt.Errorf("get config dir: %w", err)
+	}
+
+	dir := filepath.Join(configDir, "tailscale-vpn")
+	if err := os.MkdirAll(dir, 0o700); err != nil {
+		return nil, fmt.Errorf("create config dir: %w", err)
+	}
+
+	path := filepath.Join(dir, "settings.json")
+
+	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
+		if err := os.WriteFile(path, []byte(`{"servers":[]}`), 0o600); err != nil {
+			return nil, fmt.Errorf("create config file: %w", err)
+		}
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("read config file: %w", err)
+	}
+
+	var cfg Config
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parse config: %w", err)
+	}
+
+	return &ConfigService{path: path, config: cfg}, nil
+}
+
+func (s *ConfigService) GetServers() []Server {
+	return s.config.Servers
+}
+
+func (s *ConfigService) GetServer(id string) (Server, bool) {
+	for _, srv := range s.config.Servers {
+		if srv.ID == id {
+			return srv, true
+		}
+	}
+	return Server{}, false
+}
+
+func (s *ConfigService) AddServer(name, host string) error {
+	srv := Server{
+		ID:   host,
+		Name: name,
+		Host: host,
+	}
+	s.config.Servers = append(s.config.Servers, srv)
+	return s.Save()
+}
+
+func (s *ConfigService) RemoveServer(id string) error {
+	s.config.Servers = slices.DeleteFunc(s.config.Servers, func(srv Server) bool {
+		return srv.ID == id
+	})
+	return s.Save()
+}
+
+func (s *ConfigService) GetSelectedServer() (Server, bool) {
+	for _, srv := range s.config.Servers {
+		if srv.ID == s.config.SelectedServerID {
+			return srv, true
+		}
+	}
+	return Server{}, false
+}
+
+func (s *ConfigService) SetSelectedServer(id string) error {
+	for _, srv := range s.config.Servers {
+		if srv.ID == id {
+			s.config.SelectedServerID = id
+			return s.Save()
+		}
+	}
+	return fmt.Errorf("server not found")
+}
+
+func (s *ConfigService) UpdateServer(id, name, host string) error {
+	for i, srv := range s.config.Servers {
+		if srv.ID == id {
+			s.config.Servers[i].Name = name
+			s.config.Servers[i].Host = host
+			s.config.Servers[i].ID = host
+			return s.Save()
+		}
+	}
+	return fmt.Errorf("server not found")
+}
+
+func (s *ConfigService) Save() error {
+	data, err := json.MarshalIndent(s.config, "", "  ")
+	if err != nil {
+		return fmt.Errorf("marshal config: %w", err)
+	}
+	if err := os.WriteFile(s.path, data, 0o600); err != nil {
+		return fmt.Errorf("write config: %w", err)
+	}
+	return nil
+}