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Issue 29860578: Issue 6775 - Work around filter data stored in IndexedDB getting lost on Microsoft Edge (Closed)
Patch Set: Created Sept. 5, 2018, 3:53 p.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present 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 "use strict";
19
20 const {FilterNotifier} = require("../adblockpluscore/lib/filterNotifier");
21 const {FilterStorage} = require("../adblockpluscore/lib/filterStorage");
22 const {DownloadableSubscription, SpecialSubscription} =
23 require("../adblockpluscore/lib/subscriptionClasses");
24
25 const BACKUP_NAME = "file:indexedDB-backup";
26
27 let backupDelay;
28 let pendingBackup = false;
29
30 function setBackupInterval(backupInterval = 60 * 1000)
31 {
32 backupDelay = backupInterval;
33 }
34
35 setBackupInterval();
36
37 function scheduleBackup()
38 {
39 if (!pendingBackup)
40 {
41 pendingBackup = true;
42
43 setTimeout(
44 () =>
45 {
46 saveToStorage();
47 pendingBackup = false;
48 },
49 backupDelay
50 );
51 }
52 }
53
54 function saveToStorage()
55 {
56 browser.storage.local.set({
57 [BACKUP_NAME]: {
58 content: serialize(),
59 lastModified: Date.now()
60 }
61 });
62 }
63
64 function serialize()
65 {
66 let buffer = [];
67
68 for (let subscription of FilterStorage.subscriptions)
69 {
70 if (subscription instanceof SpecialSubscription)
71 {
72 subscription.serialize(buffer);
73 buffer.push("[Subscription filters]");
74 subscription.serializeFilters(buffer);
75 }
76 else if (subscription instanceof DownloadableSubscription)
77 {
78 let {homepage, title, url, disabled} = subscription;
79
80 buffer.push(
81 "[Subscription]",
82 `homepage=${homepage}`,
83 `title=${title}`,
84 `url=${url}`,
85 `disabled=${disabled}`
86 );
87 }
88 }
89 return buffer;
90 }
91
92 function getBackupData()
93 {
94 return browser.storage.local.get(BACKUP_NAME).then(items =>
95 {
96 let entry = items[BACKUP_NAME];
97 if (entry)
98 return entry;
99
100 throw {type: "NoSuchFile"};
101 });
102 }
103
104 FilterNotifier.on("load", scheduleBackup);
105 FilterNotifier.on("subscription.updated", scheduleBackup);
106 FilterNotifier.on("subscription.added", scheduleBackup);
107 FilterNotifier.on("subscription.removed", scheduleBackup);
108 FilterNotifier.on("subscription.disabled", scheduleBackup);
109 FilterNotifier.on("filter.added", scheduleBackup);
110 FilterNotifier.on("filter.removed", scheduleBackup);
111 FilterNotifier.on("filter.moved", scheduleBackup);
112 FilterNotifier.on("filter.disabled", scheduleBackup);
113
114 exports.IndexedDBBackup =
115 {
116 getBackupData,
117 // Non-public API, just for tests.
118 setBackupInterval
119 };
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