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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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/. */
/*
* The behavior implemented by gDownloadLastDir is documented here.
*
* In normal browsing sessions, gDownloadLastDir uses the browser.download.lastDir
* preference to store the last used download directory. The first time the user
* switches into the private browsing mode, the last download directory is
* preserved to the pref value, but if the user switches to another directory
* during the private browsing mode, that directory is not stored in the pref,
* and will be merely kept in memory. When leaving the private browsing mode,
* this in-memory value will be discarded, and the last download directory
* will be reverted to the pref value.
*
* Both the pref and the in-memory value will be cleared when clearing the
* browsing history. This effectively changes the last download directory
* to the default download directory on each platform.
*
* If passed a URI, the last used directory is also stored with that URI in the
* content preferences database. This can be disabled by setting the pref
* browser.download.lastDir.savePerSite to false.
*/
const LAST_DIR_PREF = "browser.download.lastDir";
const SAVE_PER_SITE_PREF = LAST_DIR_PREF + ".savePerSite";
const nsIFile = Components.interfaces.nsIFile;
this.EXPORTED_SYMBOLS = [ "DownloadLastDir" ];
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
Components.utils.import("resource://gre/modules/Services.jsm");
Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
var observer = {
QueryInterface: function (aIID) {
if (aIID.equals(Components.interfaces.nsIObserver) ||
aIID.equals(Components.interfaces.nsISupports) ||
aIID.equals(Components.interfaces.nsISupportsWeakReference))
return this;
throw Components.results.NS_NOINTERFACE;
},
observe: function (aSubject, aTopic, aData) {
switch (aTopic) {
case "last-pb-context-exited":
gDownloadLastDirFile = null;
break;
case "browser:purge-session-history":
gDownloadLastDirFile = null;
if (Services.prefs.prefHasUserValue(LAST_DIR_PREF))
Services.prefs.clearUserPref(LAST_DIR_PREF);
// Ensure that purging session history causes both the session-only PB cache
// and persistent prefs to be cleared.
let cps2 = Components.classes["@mozilla.org/content-pref/service;1"].
getService(Components.interfaces.nsIContentPrefService2);
cps2.removeByName(LAST_DIR_PREF, {usePrivateBrowsing: false});
cps2.removeByName(LAST_DIR_PREF, {usePrivateBrowsing: true});
break;
}
}
};
var os = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
os.addObserver(observer, "last-pb-context-exited", true);
os.addObserver(observer, "browser:purge-session-history", true);
function readLastDirPref() {
try {
return Services.prefs.getComplexValue(LAST_DIR_PREF, nsIFile);
}
catch (e) {
return null;
}
}
function isContentPrefEnabled() {
try {
return Services.prefs.getBoolPref(SAVE_PER_SITE_PREF);
}
catch (e) {
return true;
}
}
var gDownloadLastDirFile = readLastDirPref();
this.DownloadLastDir = function DownloadLastDir(aWindow) {
let loadContext = aWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIWebNavigation)
.QueryInterface(Components.interfaces.nsILoadContext);
// Need this in case the real thing has gone away by the time we need it.
// We only care about the private browsing state. All the rest of the
// load context isn't of interest to the content pref service.
this.fakeContext = {
QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsILoadContext]),
usePrivateBrowsing: loadContext.usePrivateBrowsing,
originAttributes: {},
};
}
DownloadLastDir.prototype = {
isPrivate: function DownloadLastDir_isPrivate() {
return this.fakeContext.usePrivateBrowsing;
},
// compat shims
get file() { return this._getLastFile(); },
set file(val) { this.setFile(null, val); },
cleanupPrivateFile: function () {
gDownloadLastDirFile = null;
},
// This function is now deprecated as it uses the sync nsIContentPrefService
// interface. New consumers should use the getFileAsync function.
getFile: function (aURI) {
let Deprecated = Components.utils.import("resource://gre/modules/Deprecated.jsm", {}).Deprecated;
Deprecated.warning("DownloadLastDir.getFile is deprecated. Please use getFileAsync instead.",
"https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/DownloadLastDir.jsm",
Components.stack.caller);
if (aURI && isContentPrefEnabled()) {
let lastDir = Services.contentPrefs.getPref(aURI, LAST_DIR_PREF, this.fakeContext);
if (lastDir) {
var lastDirFile = Components.classes["@mozilla.org/file/local;1"]
.createInstance(Components.interfaces.nsIFile);
lastDirFile.initWithPath(lastDir);
return lastDirFile;
}
}
return this._getLastFile();
},
_getLastFile: function () {
if (gDownloadLastDirFile && !gDownloadLastDirFile.exists())
gDownloadLastDirFile = null;
if (this.isPrivate()) {
if (!gDownloadLastDirFile)
gDownloadLastDirFile = readLastDirPref();
return gDownloadLastDirFile;
}
return readLastDirPref();
},
getFileAsync: function(aURI, aCallback) {
let plainPrefFile = this._getLastFile();
if (!aURI || !isContentPrefEnabled()) {
Services.tm.mainThread.dispatch(() => aCallback(plainPrefFile),
Components.interfaces.nsIThread.DISPATCH_NORMAL);
return;
}
let uri = aURI instanceof Components.interfaces.nsIURI ? aURI.spec : aURI;
let cps2 = Components.classes["@mozilla.org/content-pref/service;1"]
.getService(Components.interfaces.nsIContentPrefService2);
let result = null;
cps2.getByDomainAndName(uri, LAST_DIR_PREF, this.fakeContext, {
handleResult: aResult => result = aResult,
handleCompletion: function(aReason) {
let file = plainPrefFile;
if (aReason == Components.interfaces.nsIContentPrefCallback2.COMPLETE_OK &&
result instanceof Components.interfaces.nsIContentPref) {
file = Components.classes["@mozilla.org/file/local;1"]
.createInstance(Components.interfaces.nsIFile);
file.initWithPath(result.value);
}
aCallback(file);
}
});
},
setFile: function (aURI, aFile) {
if (aURI && isContentPrefEnabled()) {
let uri = aURI instanceof Components.interfaces.nsIURI ? aURI.spec : aURI;
let cps2 = Components.classes["@mozilla.org/content-pref/service;1"]
.getService(Components.interfaces.nsIContentPrefService2);
if (aFile instanceof Components.interfaces.nsIFile)
cps2.set(uri, LAST_DIR_PREF, aFile.path, this.fakeContext);
else
cps2.removeByDomainAndName(uri, LAST_DIR_PREF, this.fakeContext);
}
if (this.isPrivate()) {
if (aFile instanceof Components.interfaces.nsIFile)
gDownloadLastDirFile = aFile.clone();
else
gDownloadLastDirFile = null;
} else if (aFile instanceof Components.interfaces.nsIFile) {
Services.prefs.setComplexValue(LAST_DIR_PREF, nsIFile, aFile);
} else if (Services.prefs.prefHasUserValue(LAST_DIR_PREF)) {
Services.prefs.clearUserPref(LAST_DIR_PREF);
}
}
};
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