lib/filesystem/io.js - Issue 5768064935133184: Issue 2021 - Replaced FileSystem API with chrome.storage.local

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Issue 5768064935133184: Issue 2021 - Replaced FileSystem API with chrome.storage.local (Closed)

Patch Set: Rebased Created March 13, 2015, 10:32 a.m.

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1 /*

2 * This file is part of Adblock Plus <https://adblockplus.org/>,

3 * Copyright (C) 2006-2015 Eyeo GmbH

4 *

5 * Adblock Plus is free software: you can redistribute it and/or modify

6 * it under the terms of the GNU General Public License version 3 as

7 * published by the Free Software Foundation.

8 *

9 * Adblock Plus is distributed in the hope that it will be useful,

10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

12 * GNU General Public License for more details.

13 *

14 * You should have received a copy of the GNU General Public License

15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.

16 */

17

18 //

19 // No direct file system access, using FileSystem API

20 //

21

22 var IO = exports.IO =

23 {

24 _getFileEntry: function(file, create, successCallback, errorCallback)

25 {

26 if (file instanceof FakeFile)

27 file = file.path;

28 else if ("spec" in file)

29 file = file.spec;

30

31 // Remove directory path - we operate on a single directory in Chrome

32 file = file.replace(/^.*[\/\\]/, "");

33

34 // We request a gigabyte of space, just in case

35 (window.requestFileSystem \|\| window.webkitRequestFileSystem)(window.PERSISTE NT, 102410241024, function(fs)

36 {

37 fs.root.getFile(file, {create: create}, function(fileEntry)

38 {

39 successCallback(fs, fileEntry);

40 }, errorCallback);

41 }, errorCallback);

42 },

43

44 lineBreak: "\n",

45

46 resolveFilePath: function(path)

47 {

48 return new FakeFile(path);

49 },

50

51 readFromFile: function(file, listener, callback, timeLineID)

52 {

53 this._getFileEntry(file, false, function(fs, fileEntry)

54 {

55 fileEntry.file(function(file)

56 {

57 if (file.size == 0)

58 {

59 callback("File is empty");

60 return;

61 }

62

63 var reader = new FileReader();

64 reader.onloadend = function()

65 {

66 if (reader.error)

67 callback(reader.error);

68 else

69 {

70 var lines = reader.result.split(/[\r\n]+/);

71 for (var i = 0; i < lines.length; i++)

72 listener.process(lines[i]);

73 listener.process(null);

74 callback(null);

75 }

76 };

77 reader.readAsText(file);

78 }, callback);

79 }, callback);

80 },

81

82 writeToFile: function(file, data, callback, timeLineID)

83 {

84 this._getFileEntry(file, true, function(fs, fileEntry)

85 {

86 fileEntry.createWriter(function(writer)

87 {

88 var executeWriteOperation = function(op, nextOperation)

89 {

90 writer.onwriteend = function()

91 {

92 if (writer.error)

93 callback(writer.error);

94 else

95 nextOperation();

96 }.bind(this);

97

98 op();

99 }.bind(this);

100

101 var blob;

102

103 try

104 {

105 blob = new Blob([data.join(this.lineBreak) + this.lineBreak], {type: " text/plain"});

106 }

107 catch (e)

108 {

109 if (!(e instanceof TypeError))

110 throw e;

111

112 // Blob wasn't a constructor before Chrome 20

113 var builder = new (window.BlobBuilder \|\| window.WebKitBlobBuilder);

114 builder.append(data.join(this.lineBreak) + this.lineBreak);

115 blob = builder.getBlob("text/plain");

116 }

117 executeWriteOperation(writer.write.bind(writer, blob), function()

118 {

119 executeWriteOperation(writer.truncate.bind(writer, writer.position), c allback.bind(null, null));

120 });

121 }.bind(this), callback);

122 }.bind(this), callback);

123 },

124

125 copyFile: function(fromFile, toFile, callback)

126 {

127 // Simply combine read and write operations

128 var data = [];

129 this.readFromFile(fromFile, {

130 process: function(line)

131 {

132 if (line !== null)

133 data.push(line);

134 }

135 }, function(e)

136 {

137 if (e)

138 callback(e);

139 else

140 this.writeToFile(toFile, data, callback);

141 }.bind(this));

142 },

143

144 renameFile: function(fromFile, newName, callback)

145 {

146 this._getFileEntry(fromFile, false, function(fs, fileEntry)

147 {

148 fileEntry.moveTo(fs.root, newName, function()

149 {

150 callback(null);

151 }, callback);

152 }, callback);

153 },

154

155 removeFile: function(file, callback)

156 {

157 this._getFileEntry(file, false, function(fs, fileEntry)

158 {

159 fileEntry.remove(function()

160 {

161 callback(null);

162 }, callback);

163 }, callback);

164 },

165

166 statFile: function(file, callback)

167 {

168 // This needs to use Utils.runAsync(), otherwise FilterStorage might

169 // initialize too early - see #337.

170 require("utils").Utils.runAsync(function() {

171 this._getFileEntry(file, false, function(fs, fileEntry)

172 {

173 fileEntry.getMetadata(function(metadata)

174 {

175 callback(null, {

176 exists: true,

177 isDirectory: fileEntry.isDirectory,

178 isFile: fileEntry.isFile,

179 lastModified: metadata.modificationTime.getTime()

180 });

181 }, callback);

182 }, callback);

183 }.bind(this));

184 }

185 };

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