feat: implement GenFileNameFromMessage function for improved file naming

bot/handle_file.go

@@ -47,7 +47,7 @@ func handleFileMessage(ctx *ext.Context, update *ext.Update) error {
 		return dispatcher.EndGroups
 	}
 	if file.FileName == "" {
-		file.FileName = fmt.Sprintf("%d_%d_%s", update.EffectiveChat().GetID(), update.EffectiveMessage.ID, file.Hash())
+		file.FileName = GenFileNameFromMessage(*update.EffectiveMessage.Message, file)
 	}
 
 	if err := dao.SaveReceivedFile(&dao.ReceivedFile{

bot/handle_link.go

@@ -1,7 +1,6 @@
 package bot
 
 import (
-	"fmt"
 	"regexp"
 	"strconv"
 	"strings"
@@ -72,10 +71,8 @@ func handleLinkMessage(ctx *ext.Context, update *ext.Update) error {
 		ctx.Reply(update, ext.ReplyTextString("获取文件失败: "+err.Error()), nil)
 		return dispatcher.EndGroups
 	}
-	// TODO: Better file name
 	if file.FileName == "" {
-		common.Log.Warnf("文件名为空，使用生成的名称")
-		file.FileName = fmt.Sprintf("%d_%d_%s", linkChat.GetID(), messageID, file.Hash())
+		file.FileName = GenFileNameFromMessage(*update.EffectiveMessage.Message, file)
 	}
 
 	receivedFile := &dao.ReceivedFile{

bot/handle_save.go

@@ -76,9 +76,8 @@ func saveCmd(ctx *ext.Context, update *ext.Update) error {
 		return dispatcher.EndGroups
 	}
 
-	// TODO: better file name
 	if file.FileName == "" {
-		file.FileName = fmt.Sprintf("%d_%d_%s", update.EffectiveChat().GetID(), replyToMsgID, file.Hash())
+		file.FileName = GenFileNameFromMessage(*msg, file)
 	}
 	receivedFile := &dao.ReceivedFile{
 		Processing:     false,

bot/utils.go

@@ -3,6 +3,8 @@ package bot
 import (
 	"errors"
 	"fmt"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/celestix/gotgproto/dispatcher"
@@ -270,3 +272,19 @@ func HandleSilentAddTask(ctx *ext.Context, update *ext.Update, user *dao.User, t
 	})
 	return dispatcher.EndGroups
 }
+
+func GenFileNameFromMessage(message tg.Message, file *types.File) string {
+	if file.FileName != "" {
+		return file.FileName
+	}
+	text := strings.TrimSpace(message.GetMessage())
+	if text == "" {
+		return file.Hash()
+	}
+	tags := common.ExtractTagsFromText(text)
+	if len(tags) > 0 {
+		return fmt.Sprintf("%s_%s", strings.Join(tags, "_"), strconv.Itoa(message.GetID()))
+	}
+	runes := []rune(text)
+	return string(runes[:min(128, len(runes))])
+}