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/*
Copyright (C) 2017-2019 Kai Uwe Broulik <kde@privat.broulik.de>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
var activeDownloads = []
var downloadUpdateInterval = 0;
function startSendingDownloadUpdates() {
if (!chrome.downloads.onChanged.hasListener(onDownloadChanged)) {
// Register this listener only when needed. If it's active during
// browser startup, it can be triggered for existing downloads (also
// no longer existing files!) and freeze the UI for >1min!
chrome.downloads.onChanged.addListener(onDownloadChanged);
}
if (!downloadUpdateInterval) {
downloadUpdateInterval = setInterval(sendDownloadUpdates, 1000);
}
}
function stopSendingDownloadUpdates() {
if (downloadUpdateInterval) {
clearInterval(downloadUpdateInterval);
downloadUpdateInterval = 0;
}
}
function sendDownloadUpdates() {
chrome.downloads.search({
state: 'in_progress',
paused: false
}, function (results) {
if (!results.length) {
stopSendingDownloadUpdates();
return;
}
results.forEach(function (download) {
if (activeDownloads.indexOf(download.id) === -1) {
return;
}
var payload = {
id: download.id,
bytesReceived: download.bytesReceived,
estimatedEndTime: download.estimatedEndTime,
// Firefox ends along "-1" as totalBytes on download creation
// but then never updates it, so we send this along periodically, too
totalBytes: download.totalBytes
};
port.postMessage({subsystem: "downloads", event: "update", download: payload});
});
});
}
function createDownload(download) {
// don't bother telling us about completed downloads...
// otherwise on browser startup we'll spawn a gazillion download progress notification
if (download.state === "complete" || download.state === "interrupted") {
return;
}
activeDownloads.push(download.id);
startSendingDownloadUpdates();
port.postMessage({subsystem: "downloads", event: "created", download: download});
}
function sendDownloads() {
// When extension is (re)loaded, create each download initially
chrome.downloads.search({
state: 'in_progress',
}, function (results) {
results.forEach(createDownload);
});
}
chrome.downloads.onCreated.addListener(createDownload);
function onDownloadChanged(delta) {
if (activeDownloads.indexOf(delta.id) === -1) {
return;
}
// An interrupted download was resumed. When a download is interrupted, we finish (and delete)
// the job but the browser re-uses the existing download, so when this happen,
// pretend a new download was created.
if (delta.state) {
if (delta.state.previous === "interrupted" && delta.state.current === "in_progress") {
console.log("Resuming previously interrupted download, pretending a new download was created");
chrome.downloads.search({
id: delta.id
}, function (downloads) {
createDownload(downloads[0]);
});
return;
}
}
// The update timer stops automatically when there are no running downloads
// so make sure to restart it when a download is unpaused
if (delta.paused) {
if (delta.paused.previous && !delta.paused.current) {
startSendingDownloadUpdates();
}
}
var payload = {};
Object.keys(delta).forEach((key) => {
payload[key] = delta[key].current;
});
payload.id = delta.id; // not a delta, ie. has no current and thus isn't added by the loop below
port.postMessage({subsystem: "downloads", event: "update", download: payload});
};
addCallback("downloads", "cancel", function (message) {
var downloadId = message.downloadId;
console.log("Requested to cancel download", downloadId);
chrome.downloads.cancel(downloadId);
});
addCallback("downloads", "suspend", function (message) {
var downloadId = message.downloadId;
console.log("Requested to suspend download", downloadId);
chrome.downloads.pause(downloadId);
});
addCallback("downloads", "resume", function (message) {
var downloadId = message.downloadId;
console.log("Requested to resume download", downloadId);
chrome.downloads.resume(downloadId);
});
addCallback("downloads", "createAll", () => {
sendDownloads();
});
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