add preview

client/messagestorage.go

@@ -218,20 +218,55 @@ func GetMessagesHistory(peer *Peer, inAppMsgCount int, lastDbId int, wantMore in
 		ium = DbMessageToInternalUserMessage(id, peer.DbIds[fileidx], &dbm)
 		ium.Dbid = id
 		ium.Dbfile = peer.DbIds[fileidx]
+
 		messages = append(messages, *ium)
 	}
 	// TODO DB overlap
 	return messages, nil
 }
 
-// make an image from the files content (loads the first image, or build a more complex view)
-func MessagePreview(msg *InternalUserMessage, password string) ([]byte, error) {
-	// get the hidden file name
-	if len(msg.FilePaths) == 0 {
-		return nil, nil
+// Get old messages from a peer
+func GetMessagePreview(peer *Peer, dbFile string, dbId int64, password string) ([]byte, error) {
+
+	// There fileidx should provide the db that we need (unless wantMore overlaps the next DB)
+	db, _ := sql.Open("sqlite3", filepath.Join(GetConfig().StoragePath, GetConfig().GetIdentity().Uuid, dbFile+GetConfig().DbSuffix)) // Open the created SQLite File
+	defer db.Close()
+
+	stm, err := db.Prepare("SELECT id, m FROM message WHERE id=?")
+	if err != nil {
+		return nil, err
 	}
+	defer stm.Close()
+	rows, err := stm.Query(dbId)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var dbm meowlib.DbMessage
+	for rows.Next() {
+
+		var id int64
+		var m []byte
+		err = rows.Scan(&id, &m)
+		if err != nil {
+			return nil, err
+		}
+		decdata, err := meowlib.SymDecrypt(password, m)
+		if err != nil {
+			return nil, err
+		}
+		err = proto.Unmarshal(decdata, &dbm)
+		if err != nil {
+			return nil, err
+		}
+
+	}
+	return FilePreview(dbm.FilePaths[0], password)
+}
+
+func FilePreview(filename string, password string) ([]byte, error) {
 	// get the hidden file
-	encData, err := os.ReadFile(msg.FilePaths[0])
+	encData, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
@@ -243,6 +278,15 @@ func MessagePreview(msg *InternalUserMessage, password string) ([]byte, error) {
 	return data, nil
 }
 
+// make an image from the files content (loads the first image, or build a more complex view)
+func InternalUserMessagePreview(msg *InternalUserMessage, password string) ([]byte, error) {
+	// get the hidden file name
+	if len(msg.FilePaths) == 0 {
+		return nil, nil
+	}
+	return FilePreview(msg.FilePaths[0], password)
+}
+
 func getMessageCount(dbid string) (int, error) {
 	db, _ := sql.Open("sqlite3", filepath.Join(GetConfig().StoragePath, GetConfig().GetIdentity().Uuid, dbid+GetConfig().DbSuffix)) // Open the created SQLite File
 	defer db.Close()