1
|
/**
|
2
|
* Myext storage manager
|
3
|
*
|
4
|
* Copyright (C) 2021 Wojtek Kosior
|
5
|
*
|
6
|
* This code is dual-licensed under:
|
7
|
* - Asshole license 1.0,
|
8
|
* - GPLv3 or (at your option) any later version
|
9
|
*
|
10
|
* "dual-licensed" means you can choose the license you prefer.
|
11
|
*
|
12
|
* This code is released under a permissive license because I disapprove of
|
13
|
* copyright and wouldn't be willing to sue a violator. Despite not putting
|
14
|
* this code under copyleft (which is also kind of copyright), I do not want
|
15
|
* it to be made proprietary. Hence, the permissive alternative to GPL is the
|
16
|
* Asshole license 1.0 that allows me to call you an asshole if you use it.
|
17
|
* This means you're legally ok regardless of how you utilize this code but if
|
18
|
* you make it into something nonfree, you're an asshole.
|
19
|
*
|
20
|
* You should have received a copy of both GPLv3 and Asshole license 1.0
|
21
|
* together with this code. If not, please see:
|
22
|
* - https://www.gnu.org/licenses/gpl-3.0.en.html
|
23
|
* - https://koszko.org/asshole-license.txt
|
24
|
*/
|
25
|
|
26
|
"use strict";
|
27
|
|
28
|
(() => {
|
29
|
const TYPE_PREFIX = window.TYPE_PREFIX;
|
30
|
const TYPE_NAME = window.TYPE_NAME;
|
31
|
const list_prefixes = window.list_prefixes;
|
32
|
const make_lock = window.make_lock;
|
33
|
const lock = window.lock;
|
34
|
const unlock = window.unlock;
|
35
|
const make_once = window.make_once;
|
36
|
const browser = window.browser;
|
37
|
const is_chrome = window.is_chrome;
|
38
|
|
39
|
var exports = {};
|
40
|
|
41
|
/* We're yet to decide how to handle errors... */
|
42
|
|
43
|
/* Here are some basic wrappers for storage API functions */
|
44
|
|
45
|
async function get(key)
|
46
|
{
|
47
|
try {
|
48
|
/* Fix for fact that Chrome does not use promises here */
|
49
|
let promise = is_chrome ?
|
50
|
new Promise((resolve, reject) =>
|
51
|
chrome.storage.local.get(key,
|
52
|
val => resolve(val))) :
|
53
|
browser.storage.local.get(key);
|
54
|
|
55
|
return (await promise)[key];
|
56
|
} catch (e) {
|
57
|
console.log(e);
|
58
|
}
|
59
|
}
|
60
|
|
61
|
async function set(key, value)
|
62
|
{
|
63
|
try {
|
64
|
return browser.storage.local.set({[key]: value});
|
65
|
} catch (e) {
|
66
|
console.log(e);
|
67
|
}
|
68
|
}
|
69
|
|
70
|
async function setn(keys_and_values)
|
71
|
{
|
72
|
let obj = Object();
|
73
|
while (keys_and_values.length > 1) {
|
74
|
let value = keys_and_values.pop();
|
75
|
let key = keys_and_values.pop();
|
76
|
obj[key] = value;
|
77
|
}
|
78
|
|
79
|
try {
|
80
|
return browser.storage.local.set(obj);
|
81
|
} catch (e) {
|
82
|
console.log(e);
|
83
|
}
|
84
|
}
|
85
|
|
86
|
async function set_var(name, value)
|
87
|
{
|
88
|
return set(TYPE_PREFIX.VAR + name, value);
|
89
|
}
|
90
|
|
91
|
async function get_var(name)
|
92
|
{
|
93
|
return get(TYPE_PREFIX.VAR + name);
|
94
|
}
|
95
|
|
96
|
/*
|
97
|
* A special case of persisted variable is one that contains list
|
98
|
* of items.
|
99
|
*/
|
100
|
|
101
|
async function get_list_var(name)
|
102
|
{
|
103
|
let list = await get_var(name);
|
104
|
|
105
|
return list === undefined ? [] : list;
|
106
|
}
|
107
|
|
108
|
/* We maintain in-memory copies of some stored lists. */
|
109
|
|
110
|
async function list(prefix)
|
111
|
{
|
112
|
let name = TYPE_NAME[prefix] + "s"; /* Make plural. */
|
113
|
let map = new Map();
|
114
|
|
115
|
for (let item of await get_list_var(name))
|
116
|
map.set(item, await get(prefix + item));
|
117
|
|
118
|
return {map, prefix, name, listeners : new Set(), lock : make_lock()};
|
119
|
}
|
120
|
|
121
|
var pages;
|
122
|
var bags;
|
123
|
var scripts;
|
124
|
|
125
|
var list_by_prefix = {};
|
126
|
|
127
|
async function init()
|
128
|
{
|
129
|
for (let prefix of list_prefixes)
|
130
|
list_by_prefix[prefix] = await list(prefix);
|
131
|
|
132
|
return exports;
|
133
|
}
|
134
|
|
135
|
/*
|
136
|
* Facilitate listening to changes
|
137
|
*/
|
138
|
|
139
|
exports.add_change_listener = function (cb, prefixes=list_prefixes)
|
140
|
{
|
141
|
if (typeof(prefixes) === "string")
|
142
|
prefixes = [prefixes];
|
143
|
|
144
|
for (let prefix of prefixes)
|
145
|
list_by_prefix[prefix].listeners.add(cb);
|
146
|
}
|
147
|
|
148
|
exports.remove_change_listener = function (cb, prefixes=list_prefixes)
|
149
|
{
|
150
|
if (typeof(prefixes) === "string")
|
151
|
prefixes = [prefixes];
|
152
|
|
153
|
for (let prefix of prefixes)
|
154
|
list_by_prefix[prefix].listeners.delete(cb);
|
155
|
}
|
156
|
|
157
|
function broadcast_change(change, list)
|
158
|
{
|
159
|
for (let listener_callback of list.listeners)
|
160
|
listener_callback(change);
|
161
|
}
|
162
|
|
163
|
/* Prepare some hepler functions to get elements of a list */
|
164
|
|
165
|
function list_items_it(list, with_values=false)
|
166
|
{
|
167
|
return with_values ? list.map.entries() : list.map.keys();
|
168
|
}
|
169
|
|
170
|
function list_entries_it(list)
|
171
|
{
|
172
|
return list_items_it(list, true);
|
173
|
}
|
174
|
|
175
|
function list_items(list, with_values=false)
|
176
|
{
|
177
|
let array = [];
|
178
|
|
179
|
for (let item of list_items_it(list, with_values))
|
180
|
array.push(item);
|
181
|
|
182
|
return array;
|
183
|
}
|
184
|
|
185
|
function list_entries(list)
|
186
|
{
|
187
|
return list_items(list, true);
|
188
|
}
|
189
|
|
190
|
/*
|
191
|
* Below we make additional effort to update map of given kind of items
|
192
|
* every time an item is added/removed to keep everything coherent.
|
193
|
*/
|
194
|
async function set_item(item, value, list)
|
195
|
{
|
196
|
await lock(list.lock);
|
197
|
let result = await _set_item(...arguments);
|
198
|
unlock(list.lock)
|
199
|
return result;
|
200
|
}
|
201
|
async function _set_item(item, value, list)
|
202
|
{
|
203
|
let key = list.prefix + item;
|
204
|
let old_val = list.map.get(item);
|
205
|
if (old_val === undefined) {
|
206
|
let items = list_items(list);
|
207
|
items.push(item);
|
208
|
await setn([key, value, "_" + list.name, items]);
|
209
|
} else {
|
210
|
await set(key, value);
|
211
|
}
|
212
|
|
213
|
list.map.set(item, value)
|
214
|
|
215
|
let change = {
|
216
|
prefix : list.prefix,
|
217
|
item,
|
218
|
old_val,
|
219
|
new_val : value
|
220
|
};
|
221
|
|
222
|
broadcast_change(change, list);
|
223
|
|
224
|
return old_val;
|
225
|
}
|
226
|
|
227
|
// TODO: The actual idea to set value to undefined is good - this way we can
|
228
|
// also set a new list of items in the same API call. But such key
|
229
|
// is still stored in the storage. We need to somehow remove it later.
|
230
|
// For that, we're going to have to store 1 more list of each kind.
|
231
|
async function remove_item(item, list)
|
232
|
{
|
233
|
await lock(list.lock);
|
234
|
let result = await _remove_item(...arguments);
|
235
|
unlock(list.lock)
|
236
|
return result;
|
237
|
}
|
238
|
async function _remove_item(item, list)
|
239
|
{
|
240
|
let old_val = list.map.get(item);
|
241
|
if (old_val === undefined)
|
242
|
return;
|
243
|
|
244
|
let key = list.prefix + item;
|
245
|
let items = list_items(list);
|
246
|
let index = items.indexOf(item);
|
247
|
items.splice(index, 1);
|
248
|
|
249
|
await setn([key, undefined, "_" + list.name, items]);
|
250
|
|
251
|
list.map.delete(item);
|
252
|
|
253
|
let change = {
|
254
|
prefix : list.prefix,
|
255
|
item,
|
256
|
old_val,
|
257
|
new_val : undefined
|
258
|
};
|
259
|
|
260
|
broadcast_change(change, list);
|
261
|
|
262
|
return old_val;
|
263
|
}
|
264
|
|
265
|
// TODO: same as above applies here
|
266
|
async function replace_item(old_item, new_item, list, new_val=undefined)
|
267
|
{
|
268
|
await lock(list.lock);
|
269
|
let result = await _replace_item(...arguments);
|
270
|
unlock(list.lock)
|
271
|
return result;
|
272
|
}
|
273
|
async function _replace_item(old_item, new_item, list, new_val=undefined)
|
274
|
{
|
275
|
let old_val = list.map.get(old_item);
|
276
|
if (new_val === undefined) {
|
277
|
if (old_val === undefined)
|
278
|
return;
|
279
|
new_val = old_val
|
280
|
} else if (new_val === old_val && new_item === old_item) {
|
281
|
return old_val;
|
282
|
}
|
283
|
|
284
|
if (old_item === new_item || old_val === undefined) {
|
285
|
await _set_item(new_item, new_val, list);
|
286
|
return old_val;
|
287
|
}
|
288
|
|
289
|
let new_key = list.prefix + new_item;
|
290
|
let old_key = list.prefix + old_item;
|
291
|
let items = list_items(list);
|
292
|
let index = items.indexOf(old_item);
|
293
|
items[index] = new_item;
|
294
|
await setn([old_key, undefined, new_key, new_val,
|
295
|
"_" + list.name, items]);
|
296
|
|
297
|
list.map.delete(old_item);
|
298
|
|
299
|
let change = {
|
300
|
prefix : list.prefix,
|
301
|
item : old_item,
|
302
|
old_val,
|
303
|
new_val : undefined
|
304
|
};
|
305
|
|
306
|
broadcast_change(change, list);
|
307
|
|
308
|
list.map.set(new_item, new_val);
|
309
|
|
310
|
change.item = new_item;
|
311
|
change.old_val = undefined;
|
312
|
change.new_val = new_val;
|
313
|
|
314
|
broadcast_change(change, list);
|
315
|
|
316
|
return old_val;
|
317
|
}
|
318
|
|
319
|
/*
|
320
|
* For scripts, item name is chosen by user, data should be
|
321
|
* an object containing:
|
322
|
* - script's url and hash or
|
323
|
* - script's text or
|
324
|
* - all three
|
325
|
*/
|
326
|
|
327
|
/*
|
328
|
* For bags, item name is chosen by user, data is an array of 2-element
|
329
|
* arrays with type prefix and script/bag names.
|
330
|
*/
|
331
|
|
332
|
/*
|
333
|
* For pages data argument is an object with properties `allow'
|
334
|
* and `components'. Item name is url.
|
335
|
*/
|
336
|
|
337
|
exports.set = async function (prefix, item, data)
|
338
|
{
|
339
|
return set_item(item, data, list_by_prefix[prefix]);
|
340
|
}
|
341
|
|
342
|
exports.get = function (prefix, item)
|
343
|
{
|
344
|
return list_by_prefix[prefix].map.get(item);
|
345
|
}
|
346
|
|
347
|
exports.remove = async function (prefix, item)
|
348
|
{
|
349
|
return remove_item(item, list_by_prefix[prefix]);
|
350
|
}
|
351
|
|
352
|
exports.replace = async function (prefix, old_item, new_item,
|
353
|
new_data=undefined)
|
354
|
{
|
355
|
return replace_item(old_item, new_item, list_by_prefix[prefix],
|
356
|
new_data);
|
357
|
}
|
358
|
|
359
|
exports.get_all_names = function (prefix)
|
360
|
{
|
361
|
return list_items(list_by_prefix[prefix]);
|
362
|
}
|
363
|
|
364
|
exports.get_all_names_it = function (prefix)
|
365
|
{
|
366
|
return list_items_it(list_by_prefix[prefix]);
|
367
|
}
|
368
|
|
369
|
exports.get_all = function (prefix)
|
370
|
{
|
371
|
return list_entries(list_by_prefix[prefix]);
|
372
|
}
|
373
|
|
374
|
exports.get_all_it = function (prefix)
|
375
|
{
|
376
|
return list_entries_it(list_by_prefix[prefix]);
|
377
|
}
|
378
|
|
379
|
/* Finally, a quick way to wipe all the data. */
|
380
|
// TODO: maybe delete items in such order that none of them ever references
|
381
|
// an already-deleted one?
|
382
|
exports.clear = async function ()
|
383
|
{
|
384
|
let lists = list_prefixes.map((p) => list_by_prefix[p]);
|
385
|
|
386
|
for (let list of lists)
|
387
|
await lock(list.lock);
|
388
|
|
389
|
for (let list of lists) {
|
390
|
|
391
|
let change = {
|
392
|
prefix : list.prefix,
|
393
|
new_val : undefined
|
394
|
};
|
395
|
|
396
|
for (let [item, val] of list_entries_it(list)) {
|
397
|
change.item = item;
|
398
|
change.old_val = val;
|
399
|
broadcast_change(change, list);
|
400
|
}
|
401
|
|
402
|
list.map = new Map();
|
403
|
}
|
404
|
|
405
|
await browser.storage.local.clear();
|
406
|
|
407
|
for (let list of lists)
|
408
|
unlock(list.lock);
|
409
|
}
|
410
|
|
411
|
window.get_storage = make_once(init);
|
412
|
})();
|