Implement local-first remote sync flow

vault/kdbx.go

@@ -3,6 +3,7 @@ package vault
 import (
 	"crypto/rand"
 	"crypto/sha256"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -23,9 +24,10 @@ type KDBXConfig struct {
 var ErrInvalidMasterKey = errors.New("invalid master key")
 
 const (
-	templatesRoot    = "Templates"
-	recycleBinRoot   = "Recycle Bin"
-	keepassGOIDField = "KeePassGO-ID"
+	templatesRoot     = "Templates"
+	recycleBinRoot    = "Recycle Bin"
+	keepassGOIDField  = "KeePassGO-ID"
+	remoteProfilesKey = "keepassgo.remoteProfiles"
 )
 
 func LoadKDBX(r io.Reader, password string) (Model, error) {
@@ -49,6 +51,7 @@ func SaveKDBXWithConfigAndKey(wr io.Writer, model Model, key MasterKey, config *
 	db := gokeepasslib.NewDatabase(gokeepasslib.WithDatabaseKDBXVersion4())
 	db.Credentials = credentials
 	db.Content.Meta = gokeepasslib.NewMetaData()
+	db.Content.Meta.CustomData = customDataForModel(model)
 	db.Content.Root = &gokeepasslib.RootData{}
 	if config != nil && config.Header != nil {
 		db.Header = cloneHeader(config.Header)
@@ -325,6 +328,7 @@ func LoadKDBXWithConfig(r io.Reader, key MasterKey) (Model, *KDBXConfig, error)
 	for _, group := range db.Content.Root.Groups {
 		appendGroupEntries(&model, db, group, nil)
 	}
+	model.RemoteProfiles = remoteProfilesFromMeta(db.Content.Meta)
 
 	return model, &KDBXConfig{
 		Header:      cloneHeader(db.Header),
@@ -332,6 +336,39 @@ func LoadKDBXWithConfig(r io.Reader, key MasterKey) (Model, *KDBXConfig, error)
 	}, nil
 }
 
+func customDataForModel(model Model) []gokeepasslib.CustomData {
+	if len(model.RemoteProfiles) == 0 {
+		return nil
+	}
+
+	content, err := json.Marshal(model.RemoteProfiles)
+	if err != nil {
+		return nil
+	}
+
+	return []gokeepasslib.CustomData{{
+		Key:   remoteProfilesKey,
+		Value: string(content),
+	}}
+}
+
+func remoteProfilesFromMeta(meta *gokeepasslib.MetaData) []RemoteProfile {
+	if meta == nil {
+		return nil
+	}
+	for _, item := range meta.CustomData {
+		if item.Key != remoteProfilesKey {
+			continue
+		}
+		var profiles []RemoteProfile
+		if err := json.Unmarshal([]byte(item.Value), &profiles); err != nil {
+			return nil
+		}
+		return profiles
+	}
+	return nil
+}
+
 func newCredentials(key MasterKey) (*gokeepasslib.DBCredentials, error) {
 	switch {
 	case key.Password != "" && len(key.KeyFileData) > 0: