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gecko-dev/toolkit/components/places/nsLivemarkService.js

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JavaScript
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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/. */
const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
////////////////////////////////////////////////////////////////////////////////
//// Modules and services.
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
"resource://gre/modules/PlacesUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
"resource://gre/modules/NetUtil.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Task",
"resource://gre/modules/Task.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Deprecated",
"resource://gre/modules/Deprecated.jsm");
XPCOMUtils.defineLazyGetter(this, "asyncHistory", function () {
// Lazily add an history observer when it's actually needed.
PlacesUtils.history.addObserver(PlacesUtils.livemarks, true);
return PlacesUtils.asyncHistory;
});
////////////////////////////////////////////////////////////////////////////////
//// Constants
// Delay between reloads of consecute livemarks.
const RELOAD_DELAY_MS = 500;
// Expire livemarks after this time.
const EXPIRE_TIME_MS = 3600000; // 1 hour.
// Expire livemarks after this time on error.
const ONERROR_EXPIRE_TIME_MS = 300000; // 5 minutes.
////////////////////////////////////////////////////////////////////////////////
//// Livemarks cache.
XPCOMUtils.defineLazyGetter(this, "CACHE_SQL", () => {
function getAnnoSQLFragment(aAnnoParam) {
return `SELECT a.content
FROM moz_items_annos a
JOIN moz_anno_attributes n ON n.id = a.anno_attribute_id
WHERE a.item_id = b.id
AND n.name = ${aAnnoParam}`;
}
return `SELECT b.id, b.title, b.parent As parentId, b.position AS 'index',
b.guid, b.dateAdded, b.lastModified, p.guid AS parentGuid,
( ${getAnnoSQLFragment(":feedURI_anno")} ) AS feedURI,
( ${getAnnoSQLFragment(":siteURI_anno")} ) AS siteURI
FROM moz_bookmarks b
JOIN moz_bookmarks p ON b.parent = p.id
JOIN moz_items_annos a ON a.item_id = b.id
JOIN moz_anno_attributes n ON a.anno_attribute_id = n.id
WHERE b.type = :folder_type
AND n.name = :feedURI_anno`;
});
XPCOMUtils.defineLazyGetter(this, "gLivemarksCachePromised",
Task.async(function* () {
let livemarksMap = new Map();
let conn = yield PlacesUtils.promiseDBConnection();
let rows = yield conn.executeCached(CACHE_SQL,
{ folder_type: Ci.nsINavBookmarksService.TYPE_FOLDER,
feedURI_anno: PlacesUtils.LMANNO_FEEDURI,
siteURI_anno: PlacesUtils.LMANNO_SITEURI });
for (let row of rows) {
let siteURI = row.getResultByName("siteURI");
let livemark = new Livemark({
id: row.getResultByName("id"),
guid: row.getResultByName("guid"),
title: row.getResultByName("title"),
parentId: row.getResultByName("parentId"),
parentGuid: row.getResultByName("parentGuid"),
index: row.getResultByName("index"),
dateAdded: row.getResultByName("dateAdded"),
lastModified: row.getResultByName("lastModified"),
feedURI: NetUtil.newURI(row.getResultByName("feedURI")),
siteURI: siteURI ? NetUtil.newURI(siteURI) : null
});
livemarksMap.set(livemark.guid, livemark);
}
return livemarksMap;
})
);
/**
* Convert a Date object to a PRTime (microseconds).
*
* @param date
* the Date object to convert.
* @return microseconds from the epoch.
*/
function toPRTime(date) {
return date * 1000;
}
/**
* Convert a PRTime to a Date object.
*
* @param time
* microseconds from the epoch.
* @return a Date object or undefined if time was not defined.
*/
function toDate(time) {
return time ? new Date(parseInt(time / 1000)) : undefined;
}
////////////////////////////////////////////////////////////////////////////////
//// LivemarkService
function LivemarkService() {
// Cleanup on shutdown.
Services.obs.addObserver(this, PlacesUtils.TOPIC_SHUTDOWN, true);
// Observe bookmarks but don't init the service just for that.
PlacesUtils.addLazyBookmarkObserver(this, true);
}
LivemarkService.prototype = {
// This is just an helper for code readability.
_promiseLivemarksMap: () => gLivemarksCachePromised,
_reloading: false,
_startReloadTimer(livemarksMap, forceUpdate, reloaded) {
if (this._reloadTimer) {
this._reloadTimer.cancel();
}
else {
this._reloadTimer = Cc["@mozilla.org/timer;1"]
.createInstance(Ci.nsITimer);
}
this._reloading = true;
this._reloadTimer.initWithCallback(() => {
// Find first livemark to be reloaded.
for (let [ guid, livemark ] of livemarksMap) {
if (!reloaded.has(guid)) {
reloaded.add(guid);
livemark.reload(forceUpdate);
this._startReloadTimer(livemarksMap, forceUpdate, reloaded);
return;
}
}
// All livemarks have been reloaded.
this._reloading = false;
}, RELOAD_DELAY_MS, Ci.nsITimer.TYPE_ONE_SHOT);
},
//////////////////////////////////////////////////////////////////////////////
//// nsIObserver
observe(aSubject, aTopic, aData) {
if (aTopic == PlacesUtils.TOPIC_SHUTDOWN) {
if (this._reloadTimer) {
this._reloading = false;
this._reloadTimer.cancel();
delete this._reloadTimer;
}
// Stop any ongoing network fetch.
this._promiseLivemarksMap().then(livemarksMap => {
for (let livemark of livemarksMap.values()) {
livemark.terminate();
}
});
}
},
//////////////////////////////////////////////////////////////////////////////
//// mozIAsyncLivemarks
addLivemark(aLivemarkInfo) {
if (!aLivemarkInfo) {
throw new Components.Exception("Invalid arguments", Cr.NS_ERROR_INVALID_ARG);
}
let hasParentId = "parentId" in aLivemarkInfo;
let hasParentGuid = "parentGuid" in aLivemarkInfo;
let hasIndex = "index" in aLivemarkInfo;
// Must provide at least non-null parent guid/id, index and feedURI.
if ((!hasParentId && !hasParentGuid) ||
(hasParentId && aLivemarkInfo.parentId < 1) ||
(hasParentGuid &&!/^[a-zA-Z0-9\-_]{12}$/.test(aLivemarkInfo.parentGuid)) ||
(hasIndex && aLivemarkInfo.index < Ci.nsINavBookmarksService.DEFAULT_INDEX) ||
!(aLivemarkInfo.feedURI instanceof Ci.nsIURI) ||
(aLivemarkInfo.siteURI && !(aLivemarkInfo.siteURI instanceof Ci.nsIURI)) ||
(aLivemarkInfo.guid && !/^[a-zA-Z0-9\-_]{12}$/.test(aLivemarkInfo.guid))) {
throw new Components.Exception("Invalid arguments", Cr.NS_ERROR_INVALID_ARG);
}
return Task.spawn(function* () {
if (!aLivemarkInfo.parentGuid)
aLivemarkInfo.parentGuid = yield PlacesUtils.promiseItemGuid(aLivemarkInfo.parentId);
let livemarksMap = yield this._promiseLivemarksMap();
// Disallow adding a livemark inside another livemark.
if (livemarksMap.has(aLivemarkInfo.parentGuid)) {
throw new Components.Exception("Cannot create a livemark inside a livemark", Cr.NS_ERROR_INVALID_ARG);
}
// Create a new livemark.
let folder = yield PlacesUtils.bookmarks.insert({
type: PlacesUtils.bookmarks.TYPE_FOLDER,
parentGuid: aLivemarkInfo.parentGuid,
title: aLivemarkInfo.title,
index: aLivemarkInfo.index,
guid: aLivemarkInfo.guid,
dateAdded: toDate(aLivemarkInfo.dateAdded) || toDate(aLivemarkInfo.lastModified)
});
// Set feed and site URI annotations.
let id = yield PlacesUtils.promiseItemId(folder.guid);
// Create the internal Livemark object.
let livemark = new Livemark({ id
, title: folder.title
, parentGuid: folder.parentGuid
, parentId: yield PlacesUtils.promiseItemId(folder.parentGuid)
, index: folder.index
, feedURI: aLivemarkInfo.feedURI
, siteURI: aLivemarkInfo.siteURI
, guid: folder.guid
, dateAdded: toPRTime(folder.dateAdded)
, lastModified: toPRTime(folder.lastModified)
});
livemark.writeFeedURI(aLivemarkInfo.feedURI);
if (aLivemarkInfo.siteURI) {
livemark.writeSiteURI(aLivemarkInfo.siteURI);
}
if (aLivemarkInfo.lastModified) {
yield PlacesUtils.bookmarks.update({ guid: folder.guid,
lastModified: toDate(aLivemarkInfo.lastModified) });
livemark.lastModified = aLivemarkInfo.lastModified;
}
livemarksMap.set(folder.guid, livemark);
return livemark;
}.bind(this));
},
removeLivemark(aLivemarkInfo) {
if (!aLivemarkInfo) {
throw new Components.Exception("Invalid arguments", Cr.NS_ERROR_INVALID_ARG);
}
// Accept either a guid or an id.
let hasGuid = "guid" in aLivemarkInfo;
let hasId = "id" in aLivemarkInfo;
if ((hasGuid && !/^[a-zA-Z0-9\-_]{12}$/.test(aLivemarkInfo.guid)) ||
(hasId && aLivemarkInfo.id < 1) ||
(!hasId && !hasGuid)) {
throw new Components.Exception("Invalid arguments", Cr.NS_ERROR_INVALID_ARG);
}
return Task.spawn(function* () {
if (!aLivemarkInfo.guid)
aLivemarkInfo.guid = yield PlacesUtils.promiseItemGuid(aLivemarkInfo.id);
let livemarksMap = yield this._promiseLivemarksMap();
if (!livemarksMap.has(aLivemarkInfo.guid))
throw new Components.Exception("Invalid livemark", Cr.NS_ERROR_INVALID_ARG);
yield PlacesUtils.bookmarks.remove(aLivemarkInfo.guid);
}.bind(this));
},
reloadLivemarks(aForceUpdate) {
// Check if there's a currently running reload, to save some useless work.
let notWorthRestarting =
this._forceUpdate || // We're already forceUpdating.
!aForceUpdate; // The caller didn't request a forced update.
if (this._reloading && notWorthRestarting) {
// Ignore this call.
return;
}
this._promiseLivemarksMap().then(livemarksMap => {
this._forceUpdate = !!aForceUpdate;
// Livemarks reloads happen on a timer for performance reasons.
this._startReloadTimer(livemarksMap, this._forceUpdate, new Set());
});
},
getLivemark(aLivemarkInfo) {
if (!aLivemarkInfo) {
throw new Components.Exception("Invalid arguments", Cr.NS_ERROR_INVALID_ARG);
}
// Accept either a guid or an id.
let hasGuid = "guid" in aLivemarkInfo;
let hasId = "id" in aLivemarkInfo;
if ((hasGuid && !/^[a-zA-Z0-9\-_]{12}$/.test(aLivemarkInfo.guid)) ||
(hasId && aLivemarkInfo.id < 1) ||
(!hasId && !hasGuid)) {
throw new Components.Exception("Invalid arguments", Cr.NS_ERROR_INVALID_ARG);
}
return Task.spawn(function*() {
if (!aLivemarkInfo.guid)
aLivemarkInfo.guid = yield PlacesUtils.promiseItemGuid(aLivemarkInfo.id);
let livemarksMap = yield this._promiseLivemarksMap();
if (!livemarksMap.has(aLivemarkInfo.guid))
throw new Components.Exception("Invalid livemark", Cr.NS_ERROR_INVALID_ARG);
return livemarksMap.get(aLivemarkInfo.guid);
}.bind(this));
},
//////////////////////////////////////////////////////////////////////////////
//// nsINavBookmarkObserver
onBeginUpdateBatch() {},
onEndUpdateBatch() {},
onItemVisited() {},
onItemAdded() {},
onItemChanged(id, property, isAnno, value, lastModified, itemType, parentId,
guid, parentGuid) {
if (itemType != Ci.nsINavBookmarksService.TYPE_FOLDER)
return;
this._promiseLivemarksMap().then(livemarksMap => {
if (livemarksMap.has(guid)) {
let livemark = livemarksMap.get(guid);
if (property == "title") {
livemark.title = value;
}
livemark.lastModified = lastModified;
}
});
},
onItemMoved(id, parentId, oldIndex, newParentId, newIndex, itemType, guid,
oldParentGuid, newParentGuid) {
if (itemType != Ci.nsINavBookmarksService.TYPE_FOLDER)
return;
this._promiseLivemarksMap().then(livemarksMap => {
if (livemarksMap.has(guid)) {
let livemark = livemarksMap.get(guid);
livemark.parentId = newParentId;
livemark.parentGuid = newParentGuid;
livemark.index = newIndex;
}
});
},
onItemRemoved(id, parentId, index, itemType, uri, guid, parentGuid) {
if (itemType != Ci.nsINavBookmarksService.TYPE_FOLDER)
return;
this._promiseLivemarksMap().then(livemarksMap => {
if (livemarksMap.has(guid)) {
let livemark = livemarksMap.get(guid);
livemark.terminate();
livemarksMap.delete(guid);
}
});
},
//////////////////////////////////////////////////////////////////////////////
//// nsINavHistoryObserver
onPageChanged() {},
onTitleChanged() {},
onDeleteVisits() {},
onClearHistory() {
this._promiseLivemarksMap().then(livemarksMap => {
for (let livemark of livemarksMap.values()) {
livemark.updateURIVisitedStatus(null, false);
}
});
},
onDeleteURI(aURI) {
this._promiseLivemarksMap().then(livemarksMap => {
for (let livemark of livemarksMap.values()) {
livemark.updateURIVisitedStatus(aURI, false);
}
});
},
onVisit(aURI) {
this._promiseLivemarksMap().then(livemarksMap => {
for (let livemark of livemarksMap.values()) {
livemark.updateURIVisitedStatus(aURI, true);
}
});
},
//////////////////////////////////////////////////////////////////////////////
//// nsISupports
classID: Components.ID("{dca61eb5-c7cd-4df1-b0fb-d0722baba251}"),
_xpcom_factory: XPCOMUtils.generateSingletonFactory(LivemarkService),
QueryInterface: XPCOMUtils.generateQI([
Ci.mozIAsyncLivemarks
, Ci.nsINavBookmarkObserver
, Ci.nsINavHistoryObserver
, Ci.nsIObserver
, Ci.nsISupportsWeakReference
])
};
////////////////////////////////////////////////////////////////////////////////
//// Livemark
/**
* Object used internally to represent a livemark.
*
* @param aLivemarkInfo
* Object containing information on the livemark. If the livemark is
* not included in the object, a new livemark will be created.
*
* @note terminate() must be invoked before getting rid of this object.
*/
function Livemark(aLivemarkInfo)
{
this.id = aLivemarkInfo.id;
this.guid = aLivemarkInfo.guid;
this.feedURI = aLivemarkInfo.feedURI;
this.siteURI = aLivemarkInfo.siteURI || null;
this.title = aLivemarkInfo.title;
this.parentId = aLivemarkInfo.parentId;
this.parentGuid = aLivemarkInfo.parentGuid;
this.index = aLivemarkInfo.index;
this.dateAdded = aLivemarkInfo.dateAdded;
this.lastModified = aLivemarkInfo.lastModified;
this._status = Ci.mozILivemark.STATUS_READY;
// Hash of resultObservers, hashed by container.
this._resultObservers = new Map();
// Sorted array of objects representing livemark children in the form
// { uri, title, visited }.
this._children = [];
// Keeps a separate array of nodes for each requesting container, hashed by
// the container itself.
this._nodes = new Map();
this.loadGroup = null;
this.expireTime = 0;
}
Livemark.prototype = {
get status() {
return this._status;
},
set status(val) {
if (this._status != val) {
this._status = val;
this._invalidateRegisteredContainers();
}
return this._status;
},
writeFeedURI(aFeedURI) {
PlacesUtils.annotations
.setItemAnnotation(this.id, PlacesUtils.LMANNO_FEEDURI,
aFeedURI.spec,
0, PlacesUtils.annotations.EXPIRE_NEVER);
this.feedURI = aFeedURI;
},
writeSiteURI(aSiteURI) {
if (!aSiteURI) {
PlacesUtils.annotations.removeItemAnnotation(this.id,
PlacesUtils.LMANNO_SITEURI)
this.siteURI = null;
return;
}
// Security check the site URI against the feed URI principal.
let secMan = Services.scriptSecurityManager;
let feedPrincipal = secMan.getSimpleCodebasePrincipal(this.feedURI);
try {
secMan.checkLoadURIWithPrincipal(feedPrincipal, aSiteURI,
Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL);
}
catch (ex) {
return;
}
PlacesUtils.annotations
.setItemAnnotation(this.id, PlacesUtils.LMANNO_SITEURI,
aSiteURI.spec,
0, PlacesUtils.annotations.EXPIRE_NEVER);
this.siteURI = aSiteURI;
},
/**
* Tries to updates the livemark if needed.
* The update process is asynchronous.
*
* @param [optional] aForceUpdate
* If true will try to update the livemark even if its contents have
* not yet expired.
*/
updateChildren(aForceUpdate) {
// Check if the livemark is already updating.
if (this.status == Ci.mozILivemark.STATUS_LOADING)
return;
// Check the TTL/expiration on this, to check if there is no need to update
// this livemark.
if (!aForceUpdate && this.children.length && this.expireTime > Date.now())
return;
this.status = Ci.mozILivemark.STATUS_LOADING;
// Setting the status notifies observers that may remove the livemark.
if (this._terminated)
return;
try {
// Create a load group for the request. This will allow us to
// automatically keep track of redirects, so we can always
// cancel the channel.
let loadgroup = Cc["@mozilla.org/network/load-group;1"].
createInstance(Ci.nsILoadGroup);
let channel = NetUtil.newChannel({
uri: this.feedURI.spec,
loadingPrincipal: Services.scriptSecurityManager.createCodebasePrincipal(this.feedURI, {}),
contentPolicyType: Ci.nsIContentPolicy.TYPE_INTERNAL_XMLHTTPREQUEST
}).QueryInterface(Ci.nsIHttpChannel);
channel.loadGroup = loadgroup;
channel.loadFlags |= Ci.nsIRequest.LOAD_BACKGROUND |
Ci.nsIRequest.LOAD_BYPASS_CACHE;
channel.requestMethod = "GET";
channel.setRequestHeader("X-Moz", "livebookmarks", false);
// Stream the result to the feed parser with this listener
let listener = new LivemarkLoadListener(this);
channel.notificationCallbacks = listener;
channel.asyncOpen(listener, null);
this.loadGroup = loadgroup;
}
catch (ex) {
this.status = Ci.mozILivemark.STATUS_FAILED;
}
},
reload(aForceUpdate) {
this.updateChildren(aForceUpdate);
},
get children() {
return this._children;
},
set children(val) {
this._children = val;
// Discard the previous cached nodes, new ones should be generated.
for (let container of this._resultObservers.keys()) {
this._nodes.delete(container);
}
// Update visited status for each entry.
for (let child of this._children) {
asyncHistory.isURIVisited(child.uri, (aURI, aIsVisited) => {
this.updateURIVisitedStatus(aURI, aIsVisited);
});
}
return this._children;
},
_isURIVisited(aURI) {
return this.children.some(child => child.uri.equals(aURI) && child.visited);
},
getNodesForContainer(aContainerNode) {
if (this._nodes.has(aContainerNode)) {
return this._nodes.get(aContainerNode);
}
let livemark = this;
let nodes = [];
let now = Date.now() * 1000;
for (let child of this.children) {
// Workaround for bug 449811.
let localChild = child;
let node = {
// The QueryInterface is needed cause aContainerNode is a jsval.
// This is required to avoid issues with scriptable wrappers that would
// not allow the view to correctly set expandos.
get parent() {
return aContainerNode.QueryInterface(Ci.nsINavHistoryContainerResultNode);
},
get parentResult() {
return this.parent.parentResult;
},
get uri() {
return localChild.uri.spec;
},
get type() {
return Ci.nsINavHistoryResultNode.RESULT_TYPE_URI;
},
get title() {
return localChild.title;
},
get accessCount() {
return Number(livemark._isURIVisited(NetUtil.newURI(this.uri)));
},
get time() {
return 0;
},
get icon() {
return "";
},
get indentLevel() {
return this.parent.indentLevel + 1;
},
get bookmarkIndex() {
return -1;
},
get itemId() {
return -1;
},
get dateAdded() {
return now;
},
get lastModified() {
return now;
},
get tags() {
return PlacesUtils.tagging.getTagsForURI(NetUtil.newURI(this.uri)).join(", ");
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsINavHistoryResultNode])
};
nodes.push(node);
}
this._nodes.set(aContainerNode, nodes);
return nodes;
},
registerForUpdates(aContainerNode, aResultObserver) {
this._resultObservers.set(aContainerNode, aResultObserver);
},
unregisterForUpdates(aContainerNode) {
this._resultObservers.delete(aContainerNode);
this._nodes.delete(aContainerNode);
},
_invalidateRegisteredContainers() {
for (let [ container, observer ] of this._resultObservers) {
observer.invalidateContainer(container);
}
},
/**
* Updates the visited status of nodes observing this livemark.
*
* @param aURI
* If provided will update nodes having the given uri,
* otherwise any node.
* @param aVisitedStatus
* Whether the nodes should be set as visited.
*/
updateURIVisitedStatus(aURI, aVisitedStatus) {
for (let child of this.children) {
if (!aURI || child.uri.equals(aURI)) {
child.visited = aVisitedStatus;
}
}
for (let [ container, observer ] of this._resultObservers) {
if (this._nodes.has(container)) {
let nodes = this._nodes.get(container);
for (let node of nodes) {
// Workaround for bug 449811.
let localObserver = observer;
let localNode = node;
if (!aURI || node.uri == aURI.spec) {
Services.tm.mainThread.dispatch(() => {
localObserver.nodeHistoryDetailsChanged(localNode, 0, aVisitedStatus);
}, Ci.nsIThread.DISPATCH_NORMAL);
}
}
}
}
},
/**
* Terminates the livemark entry, cancelling any ongoing load.
* Must be invoked before destroying the entry.
*/
terminate() {
// Avoid handling any updateChildren request from now on.
this._terminated = true;
this.abort();
},
/**
* Aborts the livemark loading if needed.
*/
abort() {
this.status = Ci.mozILivemark.STATUS_FAILED;
if (this.loadGroup) {
this.loadGroup.cancel(Cr.NS_BINDING_ABORTED);
this.loadGroup = null;
}
},
QueryInterface: XPCOMUtils.generateQI([
Ci.mozILivemark
])
}
////////////////////////////////////////////////////////////////////////////////
//// LivemarkLoadListener
/**
* Object used internally to handle loading a livemark's contents.
*
* @param aLivemark
* The Livemark that is loading.
*/
function LivemarkLoadListener(aLivemark) {
this._livemark = aLivemark;
this._processor = null;
this._isAborted = false;
this._ttl = EXPIRE_TIME_MS;
}
LivemarkLoadListener.prototype = {
abort(aException) {
if (!this._isAborted) {
this._isAborted = true;
this._livemark.abort();
this._setResourceTTL(ONERROR_EXPIRE_TIME_MS);
}
},
// nsIFeedResultListener
handleResult(aResult) {
if (this._isAborted) {
return;
}
try {
// We need this to make sure the item links are safe
let feedPrincipal =
Services.scriptSecurityManager
.getSimpleCodebasePrincipal(this._livemark.feedURI);
// Enforce well-formedness because the existing code does
if (!aResult || !aResult.doc || aResult.bozo) {
throw new Components.Exception("", Cr.NS_ERROR_FAILURE);
}
let feed = aResult.doc.QueryInterface(Ci.nsIFeed);
let siteURI = this._livemark.siteURI;
if (feed.link && (!siteURI || !feed.link.equals(siteURI))) {
siteURI = feed.link;
this._livemark.writeSiteURI(siteURI);
}
// Insert feed items.
let livemarkChildren = [];
for (let i = 0; i < feed.items.length; ++i) {
let entry = feed.items.queryElementAt(i, Ci.nsIFeedEntry);
let uri = entry.link || siteURI;
if (!uri) {
continue;
}
try {
Services.scriptSecurityManager
.checkLoadURIWithPrincipal(feedPrincipal, uri,
Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL);
}
catch(ex) {
continue;
}
let title = entry.title ? entry.title.plainText() : "";
livemarkChildren.push({ uri: uri, title: title, visited: false });
}
this._livemark.children = livemarkChildren;
}
catch (ex) {
this.abort(ex);
}
finally {
this._processor.listener = null;
this._processor = null;
}
},
onDataAvailable(aRequest, aContext, aInputStream, aSourceOffset, aCount) {
if (this._processor) {
this._processor.onDataAvailable(aRequest, aContext, aInputStream,
aSourceOffset, aCount);
}
},
onStartRequest(aRequest, aContext) {
if (this._isAborted) {
throw new Components.Exception("", Cr.NS_ERROR_UNEXPECTED);
}
let channel = aRequest.QueryInterface(Ci.nsIChannel);
try {
// Parse feed data as it comes in
this._processor = Cc["@mozilla.org/feed-processor;1"].
createInstance(Ci.nsIFeedProcessor);
this._processor.listener = this;
this._processor.parseAsync(null, channel.URI);
this._processor.onStartRequest(aRequest, aContext);
}
catch (ex) {
Components.utils.reportError("Livemark Service: feed processor received an invalid channel for " + channel.URI.spec);
this.abort(ex);
}
},
onStopRequest(aRequest, aContext, aStatus) {
if (!Components.isSuccessCode(aStatus)) {
this.abort();
return;
}
// Set an expiration on the livemark, to reloading the data in future.
try {
if (this._processor) {
this._processor.onStopRequest(aRequest, aContext, aStatus);
}
// Calculate a new ttl
let channel = aRequest.QueryInterface(Ci.nsICachingChannel);
if (channel) {
let entryInfo = channel.cacheToken.QueryInterface(Ci.nsICacheEntry);
if (entryInfo) {
// nsICacheEntry returns value as seconds.
let expireTime = entryInfo.expirationTime * 1000;
let nowTime = Date.now();
// Note, expireTime can be 0, see bug 383538.
if (expireTime > nowTime) {
this._setResourceTTL(Math.max((expireTime - nowTime),
EXPIRE_TIME_MS));
return;
}
}
}
this._setResourceTTL(EXPIRE_TIME_MS);
}
catch (ex) {
this.abort(ex);
}
finally {
if (this._livemark.status == Ci.mozILivemark.STATUS_LOADING) {
this._livemark.status = Ci.mozILivemark.STATUS_READY;
}
this._livemark.locked = false;
this._livemark.loadGroup = null;
}
},
_setResourceTTL(aMilliseconds) {
this._livemark.expireTime = Date.now() + aMilliseconds;
},
// nsIInterfaceRequestor
getInterface(aIID) {
return this.QueryInterface(aIID);
},
// nsISupports
QueryInterface: XPCOMUtils.generateQI([
Ci.nsIFeedResultListener
, Ci.nsIStreamListener
, Ci.nsIRequestObserver
, Ci.nsIInterfaceRequestor
])
}
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([LivemarkService]);
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