[client] Feat: Support Multiple Profiles (#3980)

[client] Feat: Support Multiple Profiles (#3980)

client/internal/profilemanager/state.go

@@ -0,0 +1,57 @@
+package profilemanager
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"path/filepath"
+
+	"github.com/netbirdio/netbird/util"
+)
+
+type ProfileState struct {
+	Email string `json:"email"`
+}
+
+func (pm *ProfileManager) GetProfileState(profileName string) (*ProfileState, error) {
+	configDir, err := getConfigDir()
+	if err != nil {
+		return nil, fmt.Errorf("get config directory: %w", err)
+	}
+
+	stateFile := filepath.Join(configDir, profileName+".state.json")
+	if !fileExists(stateFile) {
+		return nil, errors.New("profile state file does not exist")
+	}
+
+	var state ProfileState
+	_, err = util.ReadJson(stateFile, &state)
+	if err != nil {
+		return nil, fmt.Errorf("read profile state: %w", err)
+	}
+
+	return &state, nil
+}
+
+func (pm *ProfileManager) SetActiveProfileState(state *ProfileState) error {
+	configDir, err := getConfigDir()
+	if err != nil {
+		return fmt.Errorf("get config directory: %w", err)
+	}
+
+	activeProf, err := pm.GetActiveProfile()
+	if err != nil {
+		if errors.Is(err, ErrNoActiveProfile) {
+			return fmt.Errorf("no active profile set: %w", err)
+		}
+		return fmt.Errorf("get active profile: %w", err)
+	}
+
+	stateFile := filepath.Join(configDir, activeProf.Name+".state.json")
+	err = util.WriteJsonWithRestrictedPermission(context.Background(), stateFile, state)
+	if err != nil {
+		return fmt.Errorf("write profile state: %w", err)
+	}
+
+	return nil
+}