feat: update template

internal/model/request/file.go

@@ -0,0 +1,35 @@
+package request
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+type UploadFileRequest struct {
+	Folder string `json:"folder" validate:"omitempty,oneof=cover avatar article common"`
+}
+
+// AllowedUploadExts 上传文件扩展名白名单（扩展名 → 期望的真实 MIME）。
+var AllowedUploadExts = map[string]string{
+	// 图片
+	".jpg":  "image/jpeg",
+	".jpeg": "image/jpeg",
+	".png":  "image/png",
+	".gif":  "image/gif",
+	".webp": "image/webp",
+	// 视频
+	".mp4":  "video/mp4",
+	".webm": "video/webm",
+}
+
+// IsAllowedUploadExt 扩展名是否在白名单内（大小写不敏感）
+func IsAllowedUploadExt(ext string) bool {
+	_, ok := AllowedUploadExts[strings.ToLower(ext)]
+	return ok
+}
+
+// MatchUploadMime 校验实际 MIME 与扩展名匹配
+func MatchUploadMime(filename, detectedMime string) bool {
+	expected, ok := AllowedUploadExts[strings.ToLower(filepath.Ext(filename))]
+	return ok && detectedMime == expected
+}