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Issue 5768064935133184: Issue 2021 - Replaced FileSystem API with chrome.storage.local (Closed)
Patch Set: Rebased Created March 3, 2015, 3:12 p.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, 1024*1024*1024, 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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