-
Notifications
You must be signed in to change notification settings - Fork 0
/
background.js
237 lines (215 loc) · 8.17 KB
/
background.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
/* include browser-background.js */
let pathSeparator = '/';
const { log } = console;
function validateInteger(currentValue, minValue, maxValue, defaultValue) {
if (currentValue == null) {
return defaultValue;
}
if (typeof currentValue !== 'number' || Number.isNaN(currentValue)) {
return defaultValue;
}
if (parseInt(currentValue, 10) !== currentValue || currentValue < minValue || currentValue > maxValue) {
return defaultValue;
}
return currentValue;
}
function validateOptions(options) {
return {
numberOfBackups: validateInteger(options.numberOfBackups, 0, 100, 3),
sizeOfBackups: validateInteger(options.sizeOfBackups, 0, 1000, undefined),
hideDownloadsShelf: options.hideDownloadsShelf == null ? true : !!options.hideDownloadsShelf,
};
}
async function loadOptions() {
return validateOptions((await storage.local.get('options')).options || {}); // eslint-disable-line no-undef
}
async function saveOptions(options) {
await storage.local.set({ options: validateOptions(options) }); // eslint-disable-line no-undef
options = await loadOptions(); // eslint-disable-line no-undef, no-param-reassign
applyOptions(options); // eslint-disable-line no-undef
return options;
}
function parsePath(path) {
let dirName;
let fileName;
let fileExtension;
let i = path.lastIndexOf(pathSeparator);
if (i < 0) {
dirName = '';
fileName = path;
} else {
dirName = path.substring(0, i + 1);
fileName = path.substring(i + 1);
}
i = fileName.lastIndexOf('.');
if (i < 0) {
fileExtension = '';
} else {
fileExtension = fileName.substring(i);
fileName = fileName.substring(0, i);
}
return { dirName, fileName, fileExtension };
}
async function trimHistory(countLimit, sizeLimit, history) {
sizeLimit = sizeLimit == null ? sizeLimit : sizeLimit * 1024 * 1024; // eslint-disable-line no-param-reassign
history.sort((a, b) => b.timeStamp - a.timeStamp);
let totalSize = 0;
const retained = [];
for (let i = 0; i < history.length; i += 1) {
const version = history[i];
totalSize += version.fileSize;
if (i >= countLimit || totalSize > sizeLimit) {
try {
await downloads.removeFile(version.downloadId); // eslint-disable-line no-undef, no-await-in-loop
log(`file ${version.filePath} with id ${version.id} was removed from downloads`);
} catch (e) {
log(`file ${version.filePath} with id ${version.id} could not be removed`);
}
try {
await downloads.erase({ id: version.downloadId }); // eslint-disable-line no-undef, no-await-in-loop
log(`file ${version.filePath} with id ${version.id} was erased from downloads`);
} catch (e) {
log(`file ${version.filePath} with id ${version.id} could not be erased`);
}
} else {
retained.push(version);
}
}
return retained;
}
async function updateHistory(countLimit, sizeLimit, path, downloadInfo) {
const key = `backups of ${path}`;
let history = (await storage.local.get(key))[key] || []; // eslint-disable-line no-undef
if (downloadInfo) {
const {
id, downloadId, filePath, fileSize, timeStamp, parentId,
} = downloadInfo;
history.push({
id, downloadId, filePath, fileSize, timeStamp, parentId,
});
}
history = await trimHistory(countLimit, sizeLimit, history);
await storage.local.set({ [key]: history }); // eslint-disable-line no-undef
}
function waitForDownload(downloadId) {
return new Promise((resolve, reject) => {
function listener(delta) {
if (delta.id === downloadId && delta.state) {
const state = delta.state.current;
if (state === 'interrupted') {
downloads.onChanged.removeListener(listener); // eslint-disable-line no-undef
reject(state);
} else if (state === 'complete') {
downloads.onChanged.removeListener(listener); // eslint-disable-line no-undef
resolve(state);
}
}
}
downloads.onChanged.addListener(listener); // eslint-disable-line no-undef
});
}
async function downloadUrl(url, downloadPrefix, fileName, fileExtension, conflictAction, parentId) {
const timeStamp = Date.now();
// FF has a promise only version of this call in browser.downloads and a callback only version in chrome.downloads.
// Chrome's chrome.downloads is a hybrid, it returns a promise in new manifest context if callback is not provided.
const downloadId = await downloads.download({ // eslint-disable-line no-undef
url, filename: downloadPrefix + fileName + fileExtension, conflictAction, saveAs: false,
});
await waitForDownload(downloadId);
const downloadInfo = await downloads.search({ id: downloadId }); // eslint-disable-line no-undef
if (downloadInfo) {
const { filename: filePath, fileSize } = downloadInfo[0];
const id = `${downloadId}@${timeStamp}`;
return [
downloadId,
{
id, downloadId, downloadPrefix, fileName, fileExtension, filePath, fileSize, timeStamp, parentId,
},
];
}
return [downloadId, undefined];
}
async function saveWiki({ content, path, state }) {
const { numberOfBackups, sizeOfBackups } = await loadOptions();
const url = createDownloadUrl(content); // eslint-disable-line no-undef
const { dirName, fileName, fileExtension } = parsePath(path);
const { id: parentId } = state;
let { downloadPrefix } = state;
const firstSave = downloadPrefix == null;
downloadPrefix = downloadPrefix || '';
let downloadId;
let downloadInfo;
try {
for (let i = 0; i < 2; i += 1) {
try {
[downloadId, downloadInfo] = await downloadUrl( // eslint-disable-line no-await-in-loop
url, downloadPrefix, fileName, fileExtension, (firstSave && !i) ? 'uniquify' : 'overwrite', parentId,
);
if (!downloadId || !downloadInfo) {
break;
}
log(`saved ${fileName}${fileExtension} to ${downloadInfo.filePath} with id ${downloadId}`);
if (downloadInfo.filePath !== path) {
// Try to re-adjust the download path.
const { dirName: downloadDir } = parsePath(downloadInfo.filePath);
if (dirName.indexOf(downloadDir) === 0) {
log(`expected download dir ${dirName} matches but file name doesn't, retrying`);
await downloads.removeFile(downloadId); // eslint-disable-line no-await-in-loop, no-undef
downloadPrefix = dirName.substring(downloadDir.length);
continue; // eslint-disable-line no-continue
} else {
log(`expected download dir ${dirName} doesn't match ${downloadDir}, giving up`);
}
}
break;
} finally {
if (downloadId) {
await downloads.erase({ id: downloadId }); // eslint-disable-line no-await-in-loop, no-undef
}
}
}
if (downloadInfo && downloadInfo.filePath === path) {
let backupDownloadInfo;
if (numberOfBackups > 0) {
const backupName = `${downloadInfo.fileName}.${downloadInfo.timeStamp}`;
log(`taking backup ${backupName}${downloadInfo.fileExtension}`);
[, backupDownloadInfo] = await downloadUrl(
url,
downloadInfo.downloadPrefix,
backupName,
downloadInfo.fileExtension,
'overwrite',
downloadInfo.parentId,
);
downloadInfo = backupDownloadInfo;
}
await updateHistory(numberOfBackups, sizeOfBackups, path, backupDownloadInfo);
}
return downloadInfo;
} finally {
if (downloadUrl) {
removeDownloadUrl(downloadUrl); // eslint-disable-line no-undef
}
}
}
function handleMessages(message, sender, sendResponse) {
const { action } = message;
if (action === 'saveWiki') {
saveWiki(message).then((info) => sendResponse(info));
return true;
}
if (action === 'loadOptions') {
loadOptions().then((options) => sendResponse(options));
return true;
}
if (action === 'saveOptions') {
saveOptions(message).then((response) => sendResponse(response));
return true;
}
return false;
}
runtime.onMessage.addListener(handleMessages); // eslint-disable-line no-undef
getPlatformInfo().then((info) => { // eslint-disable-line no-undef
pathSeparator = (info.os === 'win') ? '\\' : '/';
});
loadOptions().then(applyOptions); // eslint-disable-line no-undef