feat: 下载时若存在数据丢失风险则弹窗提示；服务端增加占用信息查看功能

server/.gitignore

@@ -1,3 +1,4 @@
 # https://dart.dev/tools/private-files
 # Created by `dart pub`
 .dart_tool/
+repo/

server/bin/server.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:file/local.dart';
+import 'package:shelf/shelf.dart';
 import 'package:shelf/shelf_io.dart';
 import 'package:shelf_dav/shelf_dav.dart';
 
@@ -24,6 +25,7 @@ void main(List<String> args) async {
   if (!rootDir.existsSync()) {
     rootDir.createSync(recursive: true);
   }
+  var user = argResults.option('user')!;
   final config = DAVConfig(
     root: rootDir,
     prefix: '/dav',
@@ -33,7 +35,7 @@ void main(List<String> args) async {
     readOnly: false,
     propertyStorageType: PropertyStorageType.file,
     authenticationProvider: BasicAuthenticationProvider.plaintext(
-      users: {argResults.option('user')!: argResults.option('auth')!},
+      users: {user: argResults.option('auth')!},
     ),
   );
 
@@ -42,6 +44,39 @@ void main(List<String> args) async {
   final ip = InternetAddress.anyIPv4;
 
   final port = int.parse(argResults.option('port') ?? '8800');
-  final server = await serve(dav.handler, ip, port);
+  final server = await serve(
+    (request) {
+      if (request.method == 'GET' && request.url.path == 'info/$user') {
+        return getInfo(rootDir);
+      }
+
+      return dav.handler.call(request);
+    },
+    ip,
+    port,
+  );
   print('WebDAV server listening on port ${server.port}');
 }
+
+Response getInfo(Directory dir) {
+  var du = Process.runSync('du', [
+    '-h',
+    '--time',
+    dir.absolute.path,
+  ]).stdout.toString();
+  var result = <String>[];
+  for (var line in du.split('\n')) {
+    var parts = line.split(dir.absolute.path);
+    if (parts.length == 2) {
+      if (parts.last.trim().isEmpty) {
+        result.insert(0, '${parts.first}总占用\n');
+      } else {
+        result.add('${parts.first}${Uri.decodeComponent(parts.last)}');
+      }
+    }
+  }
+  return Response.ok(
+    result.join('\n'),
+    headers: {'content-type': 'text/plain'},
+  );
+}