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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
var { MailServices } = ChromeUtils.import(
"resource:///modules/MailServices.jsm"
);
var { NntpUtils } = ChromeUtils.import("resource:///modules/NntpUtils.jsm");
/**
* Download articles in all subscribed newsgroups for offline use.
*/
export class NewsDownloader {
_logger = NntpUtils.logger;
/**
* @param {nsIMsgWindow} msgWindow - The associated msg window.
* @param {nsIUrlListener} urlListener - Callback for the request.
*/
constructor(msgWindow, urlListener) {
this._msgWindow = msgWindow;
this._urlListener = urlListener;
this._bundle = Services.strings.createBundle(
"chrome://messenger/locale/news.properties"
);
}
/**
* Actually start the download process.
*/
async start() {
this._logger.debug("Start downloading articles for offline use");
let servers = MailServices.accounts.allServers.filter(
x => x.type == "nntp"
);
// Download all servers concurrently.
await Promise.all(
servers.map(async server => {
let folders = server.rootFolder.descendants;
for (let folder of folders) {
if (folder.flags & Ci.nsMsgFolderFlags.Offline) {
// Download newsgroups set for offline use in a server one by one.
await this._downloadFolder(folder);
}
}
})
);
this._urlListener.OnStopRunningUrl(null, Cr.NS_OK);
this._logger.debug("Finished downloading articles for offline use");
this._msgWindow.statusFeedback.showStatusString("");
}
/**
* Download articles in a newsgroup one by one.
*
* @param {nsIMsgFolder} folder - The newsgroup folder.
*/
async _downloadFolder(folder) {
this._logger.debug(`Start downloading ${folder.URI}`);
folder.QueryInterface(Ci.nsIMsgNewsFolder).saveArticleOffline = true;
let keysToDownload = await this._getKeysToDownload(folder);
let i = 0;
let total = keysToDownload.size;
for (let key of keysToDownload) {
await new Promise(resolve => {
MailServices.nntp.fetchMessage(folder, key, this._msgWindow, null, {
OnStartRunningUrl() {},
OnStopRunningUrl() {
resolve();
},
});
});
this._msgWindow.statusFeedback.showStatusString(
this._bundle.formatStringFromName("downloadingArticlesForOffline", [
++i,
total,
folder.prettyName,
])
);
}
folder.saveArticleOffline = false;
}
/**
* Use a search session to find articles that match the download settings
* and we don't already have.
*
* @param {nsIMsgFolder} folder - The newsgroup folder.
* @returns {Set<number>}
*/
async _getKeysToDownload(folder) {
let searchSession = Cc[
"@mozilla.org/messenger/searchSession;1"
].createInstance(Ci.nsIMsgSearchSession);
let termValue = searchSession.createTerm().value;
let downloadSettings = folder.downloadSettings;
if (downloadSettings.downloadUnreadOnly) {
termValue.attrib = Ci.nsMsgSearchAttrib.MsgStatus;
termValue.status = Ci.nsMsgMessageFlags.Read;
searchSession.addSearchTerm(
Ci.nsMsgSearchAttrib.MsgStatus,
Ci.nsMsgSearchOp.Isnt,
termValue,
true,
null
);
}
if (downloadSettings.downloadByDate) {
termValue.attrib = Ci.nsMsgSearchAttrib.AgeInDays;
termValue.age = downloadSettings.ageLimitOfMsgsToDownload;
searchSession.addSearchTerm(
Ci.nsMsgSearchAttrib.AgeInDays,
Ci.nsMsgSearchOp.IsLessThan,
termValue,
true,
null
);
}
termValue.attrib = Ci.nsMsgSearchAttrib.MsgStatus;
termValue.status = Ci.nsMsgMessageFlags.Offline;
searchSession.addSearchTerm(
Ci.nsMsgSearchAttrib.MsgStatus,
Ci.nsMsgSearchOp.Isnt,
termValue,
true,
null
);
let keysToDownload = new Set();
await new Promise(resolve => {
searchSession.registerListener(
{
onSearchHit(hdr, folder) {
if (!(hdr.flags & Ci.nsMsgMessageFlags.Offline)) {
// Only need to download articles we don't already have.
keysToDownload.add(hdr.messageKey);
}
},
onSearchDone: status => {
resolve();
},
},
Ci.nsIMsgSearchSession.allNotifications
);
searchSession.addScopeTerm(Ci.nsMsgSearchScope.localNews, folder);
searchSession.search(this._msgWindow);
});
return keysToDownload;
}
}
|
