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sm-mobile-20261016T185235Z-8e93ecc1b59a Idinagdag: Okt 16, 2026, 9:29 PM · Binuo: Okt 16, 2026, 8:52 PM

sources.dart Idinagdag: Hindi naitala ang petsa 7.4 KB · 260 linya

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1import 'dart:typed_data';

2import 'package:dartssh2/dartssh2.dart';

3import '../../core/failure.dart';

4import '../documents.dart';

5import '../sftp_service.dart';

7/// Size limits: text is edited in memory up to [maxEditableBytes]; viewers

8/// (images, PDF, archives, hex) read up to [maxViewBytes].

9const maxEditableBytes = 20 * 1024 * 1024;

10const maxViewBytes = 100 * 1024 * 1024;

12/// Where an open file comes from and how it is saved back.

13abstract class FileSource {

14 String get name;

16 /// Shown to the user: server and path, or the device location.

17 String get location;

19 /// 'remote', 'device' or 'new'.

20 String get kind;

22 /// A stable key for recent files and favorites.

23 String get key;

25 /// False for files without a place to save to (new, read-only).

26 bool get canSave;

28 /// Why saving is not possible, as a localization key.

29 String? get readOnlyReason;

31 Future<Uint8List> load({int maxBytes = maxEditableBytes});

33 /// Saves [bytes]. Throws 'remoteChanged' / 'documentChanged' when the

34 /// file changed since it was loaded, unless [force].

35 Future<void> save(

36 Uint8List bytes, {

37 bool force = false,

38 bool inPlace = false,

39 });

41 Map<String, dynamic> toJson();

42}

44/// A file on the connected server, read and written over SFTP.

45class RemoteSource implements FileSource {

46 /// The current SFTP service; throws when the connection is gone.

47 final Future<SftpService> Function() service;

48 final String profileId, profileName, path;

49 SftpFileAttrs? baseline;

50 List<int>? baselineHash;

51 bool writable = true;

52 RemoteSource({

53 required this.service,

54 required this.profileId,

55 required this.profileName,

56 required this.path,

57 this.baseline,

58 });

60 @override

61 String get name => path.substring(path.lastIndexOf('/') + 1);

62 @override

63 String get location => '$profileName:$path';

64 @override

65 String get kind => 'remote';

66 @override

67 String get key => 'remote:$profileId:$path';

68 @override

69 bool get canSave => writable;

70 @override

71 String? get readOnlyReason => writable ? null : 'readOnlyRemote';

73 /// Permission bits for display, e.g. "rw-r--r--".

74 String? get permissions {

75 final mode = baseline?.mode?.value;

76 if (mode == null) return null;

77 const chars = 'rwxrwxrwx';

78 return [

79 for (var i = 0; i < 9; i++) mode & (1 << (8 - i)) != 0 ? chars[i] : '-',

80 ].join();

81 }

83 @override

84 Future<Uint8List> load({int maxBytes = maxEditableBytes}) async {

85 final s = await service();

86 final (bytes, attrs) = await s.readFile(path, maxBytes: maxBytes);

87 baseline = attrs;

88 baselineHash = await SftpService.sha256Of(bytes);

89 // Whether writing is allowed is decided by the server on save; a

90 // refusal is reported as missing permission.

91 return bytes;

92 }

94 @override

95 Future<void> save(

96 Uint8List bytes, {

97 bool force = false,

98 bool inPlace = false,

99 }) async {

100 final s = await service();

101 // Without a known state (a draft restored offline), an existing file is

102 // never overwritten silently.

103 if (baseline == null && !force && await s.statOrNull(path) != null) {

104 throw const Failure('remoteChanged');

105 }

106 final attrs = await s.saveFile(

107 path,

108 bytes,

109 expected: baseline,

110 expectedHash: baselineHash,

111 force: force,

112 inPlace: inPlace,

113 );

114 baseline = attrs;

115 baselineHash = await SftpService.sha256Of(bytes);

116 }

117

118 /// Whether the file on the server changed since it was loaded or saved.

119 Future<bool> changedOnServer() async {

120 final b = baseline;

121 if (b == null) return false;

122 try {

123 await (await service()).checkUnchanged(path, b, baselineHash);

124 return false;

125 } on Failure catch (e) {

126 if (e.code == 'remoteChanged' || e.code == 'remoteDeleted') return true;

127 rethrow;

128 }

129 }

130

131 @override

132 Map<String, dynamic> toJson() => {

133 'kind': kind,

134 'profileId': profileId,

135 'profileName': profileName,

136 'path': path,

137 if (baseline != null)

138 'baseline': {'size': baseline!.size, 'mtime': baseline!.modifyTime},

139 };

140

141 static RemoteSource fromJson(

142 Map<String, dynamic> m,

143 Future<SftpService> Function() service,

144 ) {

145 final b = m['baseline'] as Map?;

146 return RemoteSource(

147 service: service,

148 profileId: m['profileId'] as String,

149 profileName: m['profileName'] as String? ?? '',

150 path: m['path'] as String,

151 baseline: b == null

152 ? null

153 : SftpFileAttrs(

154 size: b['size'] as int?,

155 modifyTime: b['mtime'] as int?,

156 ),

157 );

158 }

159}

160

161/// A file on the device, opened through the system document picker.

162class DeviceSource implements FileSource {

163 final DocumentPlatform documents;

164 DeviceDocument doc;

165 DateTime? _modified;

166 int? _size;

167 DeviceSource(this.documents, this.doc);

168

169 /// A document that was just written with [size] bytes.

170 DeviceSource.saved(this.documents, this.doc, int size)

171 : _modified = doc.modified,

172 _size = size;

173

174 @override

175 String get name => doc.name;

176 @override

177 String get location => doc.location ?? doc.name;

178 @override

179 String get kind => 'device';

180 @override

181 String get key => 'device:${doc.id}';

182 @override

183 bool get canSave => doc.writable;

184 @override

185 String? get readOnlyReason => doc.writable ? null : 'readOnlyDevice';

186

187 @override

188 Future<Uint8List> load({int maxBytes = maxEditableBytes}) async {

189 doc = await documents.stat(doc);

190 if ((doc.size ?? 0) > maxBytes) throw const Failure('fileTooLarge');

191 final bytes = await documents.read(doc);

192 if (bytes.length > maxBytes) throw const Failure('fileTooLarge');

193 _modified = doc.modified;

194 _size = bytes.length;

195 return bytes;

196 }

197

198 @override

199 Future<void> save(

200 Uint8List bytes, {

201 bool force = false,

202 bool inPlace = false,

203 }) async {

204 if (!force && _modified != null) {

205 final now = await documents.stat(doc);

206 if (now.modified != _modified || now.size != _size) {

207 throw const Failure('documentChanged');

208 }

209 }

210 doc = await documents.write(doc, bytes);

211 _modified = doc.modified;

212 _size = bytes.length;

213 }

214

215 @override

216 Map<String, dynamic> toJson() => {'kind': kind, 'doc': doc.toJson()};

217

218 static DeviceSource fromJson(Map<String, dynamic> m, DocumentPlatform d) =>

219 DeviceSource(d, DeviceDocument.fromMap(m['doc'] as Map));

220}

221

222/// Rebuilds a source saved in a draft or the recent list.

223FileSource sourceFromJson(

224 Map<String, dynamic> m, {

225 required DocumentPlatform documents,

226 required Future<SftpService> Function(String profileId) sftpFor,

227 String fallbackName = 'untitled.txt',

228}) => switch (m['kind']) {

229 'remote' => RemoteSource.fromJson(m, () => sftpFor(m['profileId'] as String)),

230 'device' => DeviceSource.fromJson(m, documents),

231 _ => NewSource(m['name'] as String? ?? fallbackName),

232};

233

234/// A new file that has not been saved anywhere yet.

235class NewSource implements FileSource {

236 @override

237 final String name;

238 NewSource(this.name);

239 @override

240 String get location => name;

241 @override

242 String get kind => 'new';

243 @override

244 String get key => 'new:$name';

245 @override

246 bool get canSave => false;

247 @override

248 String? get readOnlyReason => null;

249 @override

250 Future<Uint8List> load({int maxBytes = maxEditableBytes}) async =>

251 Uint8List(0);

252 @override

253 Future<void> save(

254 Uint8List bytes, {

255 bool force = false,

256 bool inPlace = false,

257 }) async => throw const Failure('saveAsRequired');

258 @override

259 Map<String, dynamic> toJson() => {'kind': kind, 'name': name};

260}

261

SHA-256

e349f41188fac88f2f132ca14fdd6d25170c9ddeaddd28d1af2fadf0711acd1f

CH-J Proprietary Software License 1.14 · Ibinibigay ang source sa ilalim ng CH-J Proprietary Software License 1.14. Hindi binabago ng pagiging available nito ang mga tuntunin ng lisensya at hindi ito nagbibigay ng karagdagang karapatan.

SHA-256 ng archive

46e427a43e87af091004f36145590bda8fe90086dfb0f631afeb5029fb0b5655