explicitly set createdDate in the importer and fallback lastModifiedD…

…ate to it

core/block/import/converter/common.go

@@ -50,6 +50,7 @@ func GetCommonDetails(sourcePath, name, emoji string) *types.Struct {
 		bundle.RelationKeyName.String():           pbtypes.String(name),
 		bundle.RelationKeySourceFilePath.String(): pbtypes.String(sourcePath),
 		bundle.RelationKeyIconEmoji.String():      pbtypes.String(emoji),
+		bundle.RelationKeyCreatedDate.String():    pbtypes.Int64(time.Now().Unix()), // this relation will be after used in the tree header
 	}
 	return &types.Struct{Fields: fields}
 }

core/block/import/objectcreator.go

@@ -3,6 +3,7 @@ package importer
 import (
 	"context"
 	"fmt"
+	"path"
 	"strings"
 	"sync"
 
@@ -87,7 +88,18 @@ func (oc *ObjectCreator) Create(ctx *session.Context,
 	st := state.NewDocFromSnapshot(newID, sn.Snapshot).(*state.State)
 	st.SetRootId(newID)
 	// explicitly set last modified date, because all local details removed in NewDocFromSnapshot; createdDate covered in the object header
-	st.SetLastModified(pbtypes.GetInt64(sn.Snapshot.Data.Details, bundle.RelationKeyLastModifiedDate.String()), oc.core.ProfileID())
+	lastModifiedDate := pbtypes.GetInt64(sn.Snapshot.Data.Details, bundle.RelationKeyLastModifiedDate.String())
+	createdDate := pbtypes.GetInt64(sn.Snapshot.Data.Details, bundle.RelationKeyCreatedDate.String())
+	if lastModifiedDate == 0 {
+		if createdDate != 0 {
+			lastModifiedDate = createdDate
+		} else {
+			// we can't fallback to time.Now() because it will be inconsistent with the time used in object tree header.
+			// So instead we should EXPLICITLY set creation date to the snapshot in all importers
+			log.With("objectID", sn.Id).With("ext", path.Ext(sn.FileName)).Warnf("both lastModifiedDate and createdDate are not set in the imported snapshot")
+		}
+	}
+	st.SetLastModified(lastModifiedDate, oc.core.ProfileID())
 	var filesToDelete []string
 	defer func() {
 		// delete file in ipfs if there is error after creation

core/block/import/pb/converter.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/anyproto/any-sync/util/slice"
 	"github.com/gogo/protobuf/jsonpb"
@@ -293,6 +294,11 @@ func (p *Pb) fillDetails(name string, path string, mo *pb.SnapshotWithType) {
 	}
 	sourceDetail := converter.GetSourceDetail(name, path)
 	mo.Snapshot.Data.Details.Fields[bundle.RelationKeySourceFilePath.String()] = pbtypes.String(sourceDetail)
+
+	createdDate := pbtypes.GetInt64(mo.Snapshot.Data.Details, bundle.RelationKeyCreatedDate.String())
+	if createdDate == 0 {
+		mo.Snapshot.Data.Details.Fields[bundle.RelationKeyCreatedDate.String()] = pbtypes.Int64(time.Now().Unix())
+	}
 }
 
 func (p *Pb) Name() string {