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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/. */
import { GeckoViewUtils } from "resource://gre/modules/GeckoViewUtils.sys.mjs";
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
SessionHistory: "resource://gre/modules/sessionstore/SessionHistory.sys.mjs",
});
const { debug, warn } = GeckoViewUtils.initLogging("SessionStore");
const kNoIndex = Number.MAX_SAFE_INTEGER;
const kLastIndex = Number.MAX_SAFE_INTEGER - 1;
class SHistoryListener {
constructor(browsingContext) {
this.QueryInterface = ChromeUtils.generateQI([
"nsISHistoryListener",
"nsISupportsWeakReference",
]);
this._browserId = browsingContext.browserId;
this._fromIndex = kNoIndex;
}
unregister(permanentKey) {
const bc = BrowsingContext.getCurrentTopByBrowserId(this._browserId);
bc?.sessionHistory?.removeSHistoryListener(this);
GeckoViewSessionStore._browserSHistoryListener?.delete(permanentKey);
}
collect(
permanentKey, // eslint-disable-line no-shadow
browsingContext, // eslint-disable-line no-shadow
{ collectFull = true, writeToCache = false }
) {
// Don't bother doing anything if we haven't seen any navigations.
if (!collectFull && this._fromIndex === kNoIndex) {
return null;
}
const fromIndex = collectFull ? -1 : this._fromIndex;
this._fromIndex = kNoIndex;
const historychange = lazy.SessionHistory.collectFromParent(
browsingContext.currentURI?.spec,
true, // Bug 1704574
browsingContext.sessionHistory,
fromIndex
);
if (writeToCache) {
const win =
browsingContext.embedderElement?.ownerGlobal ||
browsingContext.currentWindowGlobal?.browsingContext?.window;
GeckoViewSessionStore.onTabStateUpdate(permanentKey, win, {
data: { historychange },
});
}
return historychange;
}
collectFrom(index) {
if (this._fromIndex <= index) {
// If we already know that we need to update history from index N we
// can ignore any changes that happened with an element with index
// larger than N.
//
// Note: initially we use kNoIndex which is MAX_SAFE_INTEGER which
// means we don't ignore anything here, and in case of navigation in
// the history back and forth cases we use kLastIndex which ignores
// only the subsequent navigations, but not any new elements added.
return;
}
const bc = BrowsingContext.getCurrentTopByBrowserId(this._browserId);
if (bc?.embedderElement?.frameLoader) {
this._fromIndex = index;
// Queue a tab state update on the |browser.sessionstore.interval|
// timer. We'll call this.collect() when we receive the update.
bc.embedderElement.frameLoader.requestSHistoryUpdate();
}
}
OnHistoryNewEntry(newURI, oldIndex) {
// We use oldIndex - 1 to collect the current entry as well. This makes
// sure to collect any changes that were made to the entry while the
// document was active.
this.collectFrom(oldIndex == -1 ? oldIndex : oldIndex - 1);
}
OnHistoryGotoIndex() {
this.collectFrom(kLastIndex);
}
OnHistoryPurge() {
this.collectFrom(-1);
}
OnHistoryReload() {
this.collectFrom(-1);
return true;
}
OnHistoryReplaceEntry() {
this.collectFrom(-1);
}
}
export var GeckoViewSessionStore = {
// For each <browser> element, records the SHistoryListener.
_browserSHistoryListener: new WeakMap(),
observe(aSubject, aTopic, aData) {
debug`observe ${aTopic}`;
switch (aTopic) {
case "browsing-context-did-set-embedder": {
if (
aSubject &&
aSubject === aSubject.top &&
aSubject.isContent &&
aSubject.embedderElement &&
aSubject.embedderElement.permanentKey
) {
const permanentKey = aSubject.embedderElement.permanentKey;
this._browserSHistoryListener
.get(permanentKey)
?.unregister(permanentKey);
this.getOrCreateSHistoryListener(permanentKey, aSubject, true);
}
break;
}
case "browsing-context-discarded":
const permanentKey = aSubject?.embedderElement?.permanentKey;
if (permanentKey) {
this._browserSHistoryListener
.get(permanentKey)
?.unregister(permanentKey);
}
break;
}
},
onTabStateUpdate(permanentKey, win, data) {
win.WindowEventDispatcher.sendRequest({
type: "GeckoView:StateUpdated",
data: data.data,
});
},
getOrCreateSHistoryListener(
permanentKey,
browsingContext,
collectImmediately = false
) {
if (!permanentKey || browsingContext !== browsingContext.top) {
return null;
}
const sessionHistory = browsingContext.sessionHistory;
if (!sessionHistory) {
return null;
}
let listener = this._browserSHistoryListener.get(permanentKey);
if (listener) {
return listener;
}
listener = new SHistoryListener(browsingContext);
sessionHistory.addSHistoryListener(listener);
this._browserSHistoryListener.set(permanentKey, listener);
if (
collectImmediately &&
(!(browsingContext.currentURI?.spec === "about:blank") ||
sessionHistory.count !== 0)
) {
listener.collect(permanentKey, browsingContext, { writeToCache: true });
}
return listener;
},
};
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