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Issue 5923900886089728: Use FileSystem API to store data in Opera (Closed)
Patch Set: Created Nov. 25, 2013, 7:39 a.m.
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1 /*
2 * This file is part of Adblock Plus <http://adblockplus.org/>,
3 * Copyright (C) 2006-2013 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 LocalStorage API
20 //
21
22 var IO = exports.IO =
23 {
24 _getFilePath: function(file)
25 {
26 if (file instanceof FakeFile)
27 return file.path;
28 else if ("spec" in file)
29 return file.spec;
30
31 throw new Error("Unexpected file type");
32 },
33
34 _setFileContents: function(path, contents, lastModified)
35 {
36 window.localStorage[path] = contents;
37 window.localStorage[path + "/lastModified"] = lastModified || 0;
38 },
39
40 lineBreak: "\n",
41
42 resolveFilePath: function(path)
43 {
44 return new FakeFile(path);
45 },
46
47 readFromFile: function(file, decode, listener, callback, timeLineID)
48 {
49 var Utils = require("utils").Utils;
50 Utils.runAsync(function()
51 {
52 if ("spec" in file && /^defaults\b/.test(file.spec))
53 {
54 // Code attempts to read the default patterns.ini, we don't have that.
55 // Make sure to execute first-run actions instead.
56 if (localStorage.currentVersion)
57 seenDataCorruption = true;
58 delete localStorage.currentVersion;
59 callback(null);
60 return;
61 }
62
63 var path = this._getFilePath(file);
64 if (!(path in window.localStorage))
65 {
66 callback(new Error("File doesn't exist"))
67 return;
68 }
69
70 var lines = window.localStorage[path].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 }.bind(this));
76 },
77
78 writeToFile: function(file, encode, data, callback, timeLineID)
79 {
80 var path = this._getFilePath(file);
81 this._setFileContents(path, data.join(this.lineBreak) + this.lineBreak, Date .now());
82
83 var Utils = require("utils").Utils;
84 Utils.runAsync(callback, null, null);
85 },
86
87 copyFile: function(fromFile, toFile, callback)
88 {
89 // Simply combine read and write operations
90 var data = [];
91 this.readFromFile(fromFile, false, {
92 process: function(line)
93 {
94 if (line !== null)
95 data.push(line);
96 }
97 }, function(e)
98 {
99 if (e)
100 callback(e);
101 else
102 this.writeToFile(toFile, false, data, callback);
103 }.bind(this));
104 },
105
106 renameFile: function(fromFile, newName, callback)
107 {
108 var path = this._getFilePath(fromFile);
109 if (!(path in window.localStorage))
110 {
111 callback(new Error("File doesn't exist"))
112 return;
113 }
114
115 this._setFileContents(newName, window.localStorage[path], window.localStorag e[path + "/lastModified"]);
116 this.removeFile(fromFile, callback);
117 },
118
119 removeFile: function(file, callback)
120 {
121 var path = this._getFilePath(file);
122 delete window.localStorage[path];
123 delete window.localStorage[path + "/lastModified"];
124 callback(null);
125 },
126
127 statFile: function(file, callback)
128 {
129 var path = this._getFilePath(file);
130 callback(null, {
131 exists: path in window.localStorage,
132 isDirectory: false,
133 isFile: true,
134 lastModified: parseInt(window.localStorage[path + "/lastModified"], 10) || 0
135 });
136 }
137 };
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