196 lines
7.8 KiB
JavaScript
196 lines
7.8 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* The behavior implemented by gDownloadLastDir is documented here.
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*
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* In normal browsing sessions, gDownloadLastDir uses the browser.download.lastDir
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* preference to store the last used download directory. The first time the user
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* switches into the private browsing mode, the last download directory is
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* preserved to the pref value, but if the user switches to another directory
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* during the private browsing mode, that directory is not stored in the pref,
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* and will be merely kept in memory. When leaving the private browsing mode,
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* this in-memory value will be discarded, and the last download directory
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* will be reverted to the pref value.
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*
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* Both the pref and the in-memory value will be cleared when clearing the
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* browsing history. This effectively changes the last download directory
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* to the default download directory on each platform.
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*
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* If passed a URI, the last used directory is also stored with that URI in the
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* content preferences database. This can be disabled by setting the pref
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* browser.download.lastDir.savePerSite to false.
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*/
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const LAST_DIR_PREF = "browser.download.lastDir";
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const SAVE_PER_SITE_PREF = LAST_DIR_PREF + ".savePerSite";
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const nsIFile = Components.interfaces.nsIFile;
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this.EXPORTED_SYMBOLS = [ "DownloadLastDir" ];
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Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
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Components.utils.import("resource://gre/modules/Services.jsm");
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Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
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var observer = {
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QueryInterface: function (aIID) {
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if (aIID.equals(Components.interfaces.nsIObserver) ||
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aIID.equals(Components.interfaces.nsISupports) ||
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aIID.equals(Components.interfaces.nsISupportsWeakReference))
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return this;
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throw Components.results.NS_NOINTERFACE;
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},
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observe: function (aSubject, aTopic, aData) {
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switch (aTopic) {
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case "last-pb-context-exited":
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gDownloadLastDirFile = null;
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break;
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case "browser:purge-session-history":
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gDownloadLastDirFile = null;
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if (Services.prefs.prefHasUserValue(LAST_DIR_PREF))
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Services.prefs.clearUserPref(LAST_DIR_PREF);
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// Ensure that purging session history causes both the session-only PB cache
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// and persistent prefs to be cleared.
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let cps2 = Components.classes["@mozilla.org/content-pref/service;1"].
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getService(Components.interfaces.nsIContentPrefService2);
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cps2.removeByName(LAST_DIR_PREF, {usePrivateBrowsing: false});
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cps2.removeByName(LAST_DIR_PREF, {usePrivateBrowsing: true});
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break;
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}
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}
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};
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var os = Components.classes["@mozilla.org/observer-service;1"]
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.getService(Components.interfaces.nsIObserverService);
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os.addObserver(observer, "last-pb-context-exited", true);
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os.addObserver(observer, "browser:purge-session-history", true);
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function readLastDirPref() {
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try {
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return Services.prefs.getComplexValue(LAST_DIR_PREF, nsIFile);
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}
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catch (e) {
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return null;
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}
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}
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function isContentPrefEnabled() {
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try {
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return Services.prefs.getBoolPref(SAVE_PER_SITE_PREF);
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}
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catch (e) {
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return true;
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}
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}
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var gDownloadLastDirFile = readLastDirPref();
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this.DownloadLastDir = function DownloadLastDir(aWindow) {
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let loadContext = aWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
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.getInterface(Components.interfaces.nsIWebNavigation)
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.QueryInterface(Components.interfaces.nsILoadContext);
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// Need this in case the real thing has gone away by the time we need it.
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// We only care about the private browsing state. All the rest of the
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// load context isn't of interest to the content pref service.
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this.fakeContext = {
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QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsILoadContext]),
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usePrivateBrowsing: loadContext.usePrivateBrowsing,
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originAttributes: {},
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};
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}
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DownloadLastDir.prototype = {
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isPrivate: function DownloadLastDir_isPrivate() {
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return this.fakeContext.usePrivateBrowsing;
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},
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// compat shims
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get file() { return this._getLastFile(); },
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set file(val) { this.setFile(null, val); },
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cleanupPrivateFile: function () {
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gDownloadLastDirFile = null;
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},
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// This function is now deprecated as it uses the sync nsIContentPrefService
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// interface. New consumers should use the getFileAsync function.
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getFile: function (aURI) {
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let Deprecated = Components.utils.import("resource://gre/modules/Deprecated.jsm", {}).Deprecated;
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Deprecated.warning("DownloadLastDir.getFile is deprecated. Please use getFileAsync instead.",
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"https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/DownloadLastDir.jsm",
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Components.stack.caller);
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if (aURI && isContentPrefEnabled()) {
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let lastDir = Services.contentPrefs.getPref(aURI, LAST_DIR_PREF, this.fakeContext);
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if (lastDir) {
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var lastDirFile = Components.classes["@mozilla.org/file/local;1"]
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.createInstance(Components.interfaces.nsIFile);
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lastDirFile.initWithPath(lastDir);
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return lastDirFile;
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}
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}
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return this._getLastFile();
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},
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_getLastFile: function () {
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if (gDownloadLastDirFile && !gDownloadLastDirFile.exists())
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gDownloadLastDirFile = null;
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if (this.isPrivate()) {
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if (!gDownloadLastDirFile)
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gDownloadLastDirFile = readLastDirPref();
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return gDownloadLastDirFile;
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}
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return readLastDirPref();
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},
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getFileAsync: function(aURI, aCallback) {
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let plainPrefFile = this._getLastFile();
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if (!aURI || !isContentPrefEnabled()) {
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Services.tm.mainThread.dispatch(() => aCallback(plainPrefFile),
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Components.interfaces.nsIThread.DISPATCH_NORMAL);
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return;
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}
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let uri = aURI instanceof Components.interfaces.nsIURI ? aURI.spec : aURI;
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let cps2 = Components.classes["@mozilla.org/content-pref/service;1"]
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.getService(Components.interfaces.nsIContentPrefService2);
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let result = null;
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cps2.getByDomainAndName(uri, LAST_DIR_PREF, this.fakeContext, {
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handleResult: aResult => result = aResult,
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handleCompletion: function(aReason) {
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let file = plainPrefFile;
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if (aReason == Components.interfaces.nsIContentPrefCallback2.COMPLETE_OK &&
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result instanceof Components.interfaces.nsIContentPref) {
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file = Components.classes["@mozilla.org/file/local;1"]
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.createInstance(Components.interfaces.nsIFile);
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file.initWithPath(result.value);
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}
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aCallback(file);
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}
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});
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},
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setFile: function (aURI, aFile) {
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if (aURI && isContentPrefEnabled()) {
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let uri = aURI instanceof Components.interfaces.nsIURI ? aURI.spec : aURI;
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let cps2 = Components.classes["@mozilla.org/content-pref/service;1"]
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.getService(Components.interfaces.nsIContentPrefService2);
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if (aFile instanceof Components.interfaces.nsIFile)
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cps2.set(uri, LAST_DIR_PREF, aFile.path, this.fakeContext);
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else
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cps2.removeByDomainAndName(uri, LAST_DIR_PREF, this.fakeContext);
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}
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if (this.isPrivate()) {
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if (aFile instanceof Components.interfaces.nsIFile)
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gDownloadLastDirFile = aFile.clone();
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else
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gDownloadLastDirFile = null;
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} else if (aFile instanceof Components.interfaces.nsIFile) {
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Services.prefs.setComplexValue(LAST_DIR_PREF, nsIFile, aFile);
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} else if (Services.prefs.prefHasUserValue(LAST_DIR_PREF)) {
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Services.prefs.clearUserPref(LAST_DIR_PREF);
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}
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}
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};
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