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sm-mobile-20261016T050549Z-3678f2a05fa9 Hinzugefügt: 16.10.2026, 07:12 · Erstellt: 16.10.2026, 07:05

sftp_service.dart Hinzugefügt: Datum nicht erfasst 5,9 KB · 229 Zeilen

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1import 'dart:async';

2import 'dart:io';

3import 'dart:typed_data';

4import 'package:dartssh2/dartssh2.dart';

5import '../core/failure.dart';

6import '../models/server_profile.dart';

8String safeName(String name) {

9 if (name.isEmpty ||

10 name == '.' ||

11 name == '..' ||

12 name.length > 255 ||

13 RegExp(r'[/\\\x00-\x1f\x7f]').hasMatch(name)) {

14 throw const Failure('unsafePath');

15 }

16 return name;

17}

19String safePath(String path) {

20 if (!path.startsWith('/') ||

21 RegExp(r'[\\\x00-\x1f\x7f]').hasMatch(path) ||

22 path.split('/').any((s) => s == '.' || s == '..')) {

23 throw const Failure('unsafePath');

24 }

25 return path == '/' ? '/' : path.replaceAll(RegExp(r'/+$'), '');

26}

28String childPath(String parent, String name) =>

29 '${safePath(parent) == '/' ? '' : safePath(parent)}/${safeName(name)}';

30String parentPath(String path) {

31 safePath(path);

32 final index = path.lastIndexOf('/');

33 return index <= 0 ? '/' : path.substring(0, index);

34}

36class TransferToken {

37 bool cancelled = false;

38 void Function()? abort;

39 void cancel() {

40 cancelled = true;

41 abort?.call();

42 }

44 void check() {

45 if (cancelled) throw const Failure('cancelled');

46 }

47}

49class SftpService {

50 final SftpClient client;

51 SftpService(this.client);

52 Future<String> home() async => safePath(await client.absolute('.'));

53 Future<void> guard(String path, {bool missingLeaf = false}) async {

54 safePath(path);

55 var current = '';

56 final parts = path.split('/').where((p) => p.isNotEmpty).toList();

57 for (var i = 0; i < parts.length; i++) {

58 current += '/${safeName(parts[i])}';

59 try {

60 final attrs = await client.stat(current, followLink: false);

61 if (attrs.isSymbolicLink ||

62 (i < parts.length - 1 && !attrs.isDirectory)) {

63 throw const Failure('unsafePath');

64 }

65 } on SftpStatusError catch (e) {

66 if (missingLeaf && i == parts.length - 1 && e.code == 2) return;

67 rethrow;

68 }

69 }

70 }

72 Future<List<SftpName>> list(String path) async {

73 await guard(path);

74 final entries = await client.listdir(path);

75 final filtered = entries

76 .where((e) => e.filename != '.' && e.filename != '..')

77 .toList();

78 for (final entry in filtered) {

79 safeName(entry.filename);

80 }

81 filtered.sort(

82 (a, b) => a.attr.isDirectory == b.attr.isDirectory

83 ? a.filename.toLowerCase().compareTo(b.filename.toLowerCase())

84 : a.attr.isDirectory

85 ? -1

86 : 1,

87 );

88 return filtered;

89 }

91 Future<void> mkdir(String path) async {

92 await guard(path, missingLeaf: true);

93 await client.mkdir(path);

94 }

96 Future<void> rename(String oldPath, String newPath) async {

97 await guard(oldPath);

98 await guard(newPath, missingLeaf: true);

99 await _absent(newPath);

100 await client.rename(oldPath, newPath);

101 }

102

103 Future<void> remove(String path) async {

104 if (path == '/') throw const Failure('unsafePath');

105 await guard(path);

106 final attrs = await client.stat(path, followLink: false);

107 if (attrs.isDirectory) {

108 await client.rmdir(path);

109 } else {

110 await client.remove(path);

111 }

112 }

113

114 Future<void> _absent(String path) async {

115 try {

116 await client.stat(path, followLink: false);

117 } on SftpStatusError catch (e) {

118 if (e.code == 2) return;

119 rethrow;

120 }

121 throw const Failure('fileExists');

122 }

123

124 Future<void> upload(

125 Stream<Uint8List> stream,

126 int size,

127 String remote,

128 TransferToken token,

129 void Function(int, int) progress,

130 ) async {

131 await guard(remote, missingLeaf: true);

132 await _absent(remote);

133 token.check();

134 final temp = childPath(parentPath(remote), '.sm-${newId()}.part');

135 SftpFile? file;

136 var created = false;

137 try {

138 file = await client.open(

139 temp,

140 mode:

141 SftpFileOpenMode.write |

142 SftpFileOpenMode.create |

143 SftpFileOpenMode.exclusive,

144 );

145 created = true;

146 final writer = file.write(

147 stream,

148 onProgress: (n) {

149 progress(n, size);

150 },

151 );

152 token.abort = () {

153 unawaited(writer.abort().catchError((Object _) {}));

154 };

155 if (token.cancelled) token.abort!();

156 await writer.done;

157 token.check();

158 await file.close();

159 file = null;

160 await guard(remote, missingLeaf: true);

161 await _absent(remote);

162 await client.rename(temp, remote);

163 } catch (_) {

164 try {

165 await file?.close();

166 if (created) await client.remove(temp);

167 } catch (_) {

168 /* Session may already be closed. */

169 }

170 rethrow;

171 } finally {

172 token.abort = null;

173 }

174 }

175

176 Future<void> download(

177 String remote,

178 File local,

179 TransferToken token,

180 void Function(int, int) progress,

181 ) async {

182 await guard(remote);

183 token.check();

184 final attrs = await client.stat(remote, followLink: false);

185 if (!attrs.isFile) throw const Failure('unsafePath');

186 final file = await client.open(remote);

187 final sink = local.openWrite();

188 token.abort = () {

189 unawaited(file.close().catchError((Object _) {}));

190 };

191 try {

192 await sink.addStream(

193 file

194 .read(

195 onProgress: (n) {

196 progress(n, attrs.size ?? 0);

197 },

198 )

199 .map((c) {

200 token.check();

201 return c;

202 }),

203 );

204 token.check();

205 await sink.flush();

206 await sink.close();

207 } catch (_) {

208 try {

209 await sink.close();

210 } catch (_) {

211 /* Preserve the original transfer failure. */

212 }

213 if (await local.exists()) await local.delete();

214 rethrow;

215 } finally {

216 token.abort = null;

217 try {

218 await sink.close();

219 } catch (_) {

220 /* Already handled above. */

221 }

222 try {

223 await file.close();

224 } catch (_) {

225 /* Cancellation closes the handle. */

226 }

227 }

228 }

229}

230

SHA-256

3b1d8c99e5ee9475264d9a4c3482de0057f7a6274130e298579cfa2753e6ba19

CH-J Proprietary Software License 1.14 · Die Quellen werden unter der CH-J Proprietary Software License 1.14 bereitgestellt. Ihre Verfügbarkeit ändert die Lizenzbedingungen nicht und gewährt keine zusätzlichen Rechte.

SHA-256 des Archivs

c486a807e4828998b9c57ab0f2e760f7980b31965fe118e89d3e1a5a2b65be65