fix: remove trailing slash from file paths in PROPFIND requests.Synology WebDAV requires file paths without trailing slashes to avoid 400 errors.

修复：PROPFIND请求如果是文件则不要增加尾 '/'，群晖不支持，会返回400请求

Author: aa2013

lib/src/client.dart

@@ -72,8 +72,10 @@ class Client {
   }
 
   /// Read a single files properties
-  Future<File> readProps(String path, [CancelToken? cancelToken]) async {
-    path = fixSlashes(path);
+  Future<File> readProps(String path,{ bool isFile = false, CancelToken? cancelToken}) async {
+    //如果是文件，不要添加尾 '/', 因为一些服务器可能不支持文件带 尾 '/' 的props请求，例如群晖
+    //If it is a file, do not add a trailing '/', because some servers (such as Synology) may not support PROPFIND requests for files with a trailing '/'.
+    path = isFile ? fixSlashStart(path) : fixSlashes(path);
     var resp = await this
         .c
         .wdPropfind(this, path, true, fileXmlStr, cancelToken: cancelToken);

lib/src/utils.dart

@@ -102,11 +102,17 @@ String fixSlash(String s) {
   return s;
 }
 
-// 添加 '/' 前后缀
-String fixSlashes(String s) {
+//添加 '/' 前缀
+String fixSlashStart(String s){
   if (!s.startsWith('/')) {
     s = '/${s}';
   }
+  return s;
+}
+
+// 添加 '/' 前后缀
+String fixSlashes(String s) {
+  s = fixSlashStart(s);
   return fixSlash(s);
 }