feat: custom filename template (#110)

client/bot/handlers/utils/mediautil/media.go

@@ -1,6 +1,20 @@
 package mediautil
 
-import "github.com/gotd/td/tg"
+import (
+	"context"
+	"fmt"
+	"strings"
+	"text/template"
+	"time"
+
+	"github.com/charmbracelet/log"
+	"github.com/gotd/td/tg"
+	"github.com/krau/SaveAny-Bot/common/utils/strutil"
+	"github.com/krau/SaveAny-Bot/common/utils/tgutil"
+	"github.com/krau/SaveAny-Bot/database"
+	"github.com/krau/SaveAny-Bot/pkg/enums/fnamest"
+	"github.com/krau/SaveAny-Bot/pkg/tfile"
+)
 
 func IsSupported(media tg.MessageMediaClass) bool {
 	switch media.(type) {
@@ -10,3 +24,83 @@ func IsSupported(media tg.MessageMediaClass) bool {
 		return false
 	}
 }
+
+type FilenameTemplateData struct {
+	MsgID    string `json:"msgid,omitempty"`
+	MsgTags  string `json:"msgtags,omitempty"`
+	MsgGen   string `json:"msggen,omitempty"`
+	MsgDate  string `json:"msgdate,omitempty"`
+	OrigName string `json:"origname,omitempty"`
+}
+
+func (f FilenameTemplateData) ToMap() map[string]string {
+	return map[string]string{
+		"msgid":    f.MsgID,
+		"msgtags":  f.MsgTags,
+		"msggen":   f.MsgGen,
+		"msgdate":  f.MsgDate,
+		"origname": f.OrigName,
+	}
+}
+
+func TfileOptions(ctx context.Context, user *database.User, message *tg.Message) []tfile.TGFileOption {
+	opts := make([]tfile.TGFileOption, 0)
+	var fnameOpt tfile.TGFileOption
+	switch user.FilenameStrategy {
+	case fnamest.Message.String():
+		fnameOpt = tfile.WithName(tgutil.GenFileNameFromMessage(*message))
+	case fnamest.Template.String():
+		if user.FilenameTemplate == "" {
+			log.FromContext(ctx).Warnf("empty filename template")
+			fnameOpt = tfile.WithNameIfEmpty(tgutil.GenFileNameFromMessage(*message))
+			break
+		}
+		tmpl, err := template.New("filename").Parse(user.FilenameTemplate)
+		if err != nil {
+			log.FromContext(ctx).Errorf("failed to parse filename template: %s", err)
+			fnameOpt = tfile.WithNameIfEmpty(tgutil.GenFileNameFromMessage(*message))
+			break
+		}
+		data := FilenameTemplateData{
+			MsgID: func() string {
+				id := message.GetID()
+				if id == 0 {
+					return ""
+				}
+				return fmt.Sprintf("%d", id)
+			}(),
+			MsgTags: func() string {
+				tags := strutil.ExtractTagsFromText(message.GetMessage())
+				if len(tags) == 0 {
+					return ""
+				}
+				return strings.Join(tags, "_")
+			}(),
+			MsgGen: tgutil.GenFileNameFromMessage(*message),
+			OrigName: func() string {
+				f, _ := tgutil.GetMediaFileName(message.Media)
+				return f
+			}(),
+			MsgDate: func() string {
+				date := message.GetDate()
+				if date == 0 {
+					return ""
+				}
+				t := time.Unix(int64(date), 0)
+				return t.Format("2006-01-02_15-04-05")
+			}(),
+		}.ToMap()
+		var sb strings.Builder
+		err = tmpl.Execute(&sb, data)
+		if err != nil {
+			log.FromContext(ctx).Errorf("failed to execute filename template: %s", err)
+			fnameOpt = tfile.WithNameIfEmpty(tgutil.GenFileNameFromMessage(*message))
+			break
+		}
+		fnameOpt = tfile.WithName(sb.String())
+	default:
+		fnameOpt = tfile.WithNameIfEmpty(tgutil.GenFileNameFromMessage(*message))
+	}
+	opts = append(opts, fnameOpt, tfile.WithMessage(message))
+	return opts
+}