Fix: add missing ListOfficeFiles handler

backend/handlers/onlyoffice.go

@@ -165,6 +165,59 @@ func (h *OnlyOfficeHandler) CreateBlank(c *fiber.Ctx) error {
 	})
 }
 
+// ListOfficeFiles returns all .docx or .pptx files across the entire storage directory.
+// GET /api/onlyoffice/files?type=docx|pptx
+func (h *OnlyOfficeHandler) ListOfficeFiles(c *fiber.Ctx) error {
+	fileType := c.Query("type", "docx") // "docx" or "pptx"
+	ext := ".docx"
+	if fileType == "pptx" {
+		ext = ".pptx"
+	}
+
+	type OfficeFile struct {
+		Name    string `json:"name"`
+		Path    string `json:"path"`
+		Size    int64  `json:"size"`
+		ModTime string `json:"mod_time"`
+	}
+
+	var results []OfficeFile
+
+	filepath.Walk(h.Config.StorageDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		if info.IsDir() {
+			base := filepath.Base(path)
+			if strings.HasPrefix(base, ".") && path != h.Config.StorageDir {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		if strings.HasSuffix(strings.ToLower(info.Name()), ext) {
+			relPath, _ := filepath.Rel(h.Config.StorageDir, path)
+			results = append(results, OfficeFile{
+				Name:    info.Name(),
+				Path:    filepath.ToSlash(relPath),
+				Size:    info.Size(),
+				ModTime: info.ModTime().UTC().Format("2006-01-02T15:04:05Z"),
+			})
+		}
+		return nil
+	})
+
+	if results == nil {
+		results = []OfficeFile{}
+	}
+
+	return c.JSON(fiber.Map{
+		"files": results,
+		"count": len(results),
+	})
+}
+
 // createBlankOfficeFile creates a minimal valid .docx or .pptx file.
 // These formats are ZIP archives containing XML files following the
 // Office Open XML (OOXML) standard.