gatway

service/file_detect.go

@@ -11,6 +11,10 @@ func DetectFileType(data []byte) (contentType string, ext string) {
 		return "application/octet-stream", ""
 	}
 	ct := http.DetectContentType(data)
+	// http.DetectContentType 可能带 charset 等参数：text/plain; charset=utf-8
+	if idx := strings.Index(ct, ";"); idx > 0 {
+		ct = strings.TrimSpace(ct[:idx])
+	}
 	switch ct {
 	case "audio/mpeg":
 		return ct, ".mp3"
@@ -24,12 +28,20 @@ func DetectFileType(data []byte) (contentType string, ext string) {
 		return ct, ".jpg"
 	case "application/pdf":
 		return ct, ".pdf"
+	case "text/plain":
+		return ct, ".txt"
+	case "application/json":
+		return ct, ".json"
 	default:
 		// 兜底：尝试从 ct 截取 subtype 作为后缀（例如 application/json）
 		if parts := strings.Split(ct, "/"); len(parts) == 2 {
-			return ct, "." + parts[1]
+			sub := parts[1]
+			// 避免出现 "plain; charset=utf-8" 之类的后缀
+			if idx := strings.Index(sub, ";"); idx > 0 {
+				sub = strings.TrimSpace(sub[:idx])
+			}
+			return ct, "." + sub
 		}
 		return ct, ""
 	}
 }
-