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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 lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
RemoteSettings: "resource://services-settings/remote-settings.sys.mjs",
});
const COLLECTION_NAME = "partitioning-exempt-urls";
const PREF_NAME = "privacy.restrict3rdpartystorage.skip_list";
class Feature {
constructor() {
this.prefName = PREF_NAME;
this.observers = new Set();
this.prefValue = [];
this.remoteEntries = [];
if (this.prefName) {
let prefValue = Services.prefs.getStringPref(this.prefName, null);
this.prefValue = prefValue ? prefValue.split(";") : [];
Services.prefs.addObserver(this.prefName, this);
}
}
async addAndRunObserver(observer) {
this.observers.add(observer);
this.notifyObservers(observer);
}
removeObserver(observer) {
this.observers.delete(observer);
}
observe(subject, topic, data) {
if (topic != "nsPref:changed" || data != this.prefName) {
console.error(`Unexpected event ${topic} with ${data}`);
return;
}
let prefValue = Services.prefs.getStringPref(this.prefName, null);
this.prefValue = prefValue ? prefValue.split(";") : [];
this.notifyObservers();
}
onRemoteSettingsUpdate(entries) {
this.remoteEntries = [];
for (let entry of entries) {
this.remoteEntries.push(
`${entry.firstPartyOrigin},${entry.thirdPartyOrigin}`
);
}
}
notifyObservers(observer = null) {
let entries = this.prefValue.concat(this.remoteEntries);
let entriesAsString = entries.join(";").toLowerCase();
if (observer) {
observer.onExceptionListUpdate(entriesAsString);
} else {
for (let obs of this.observers) {
obs.onExceptionListUpdate(entriesAsString);
}
}
}
}
export function PartitioningExceptionListService() {}
PartitioningExceptionListService.prototype = {
classID: Components.ID("{ab94809d-33f0-4f28-af38-01efbd3baf22}"),
QueryInterface: ChromeUtils.generateQI([
"nsIPartitioningExceptionListService",
]),
_initialized: false,
async lazyInit() {
if (this._initialized) {
return;
}
this.feature = new Feature();
let rs = lazy.RemoteSettings(COLLECTION_NAME);
rs.on("sync", event => {
let {
data: { current },
} = event;
this.onUpdateEntries(current);
});
this._initialized = true;
let entries;
// If the remote settings list hasn't been populated yet we have to make sure
// to do it before firing the first notification.
// This has to be run after _initialized is set because we'll be
// blocked while getting entries from RemoteSetting, and we don't want
// LazyInit is executed again.
try {
// The data will be initially available from the local DB (via a
// resource:// URI).
entries = await rs.get();
} catch (e) {}
// RemoteSettings.get() could return null, ensure passing a list to
// onUpdateEntries.
this.onUpdateEntries(entries || []);
},
onUpdateEntries(entries) {
if (!this.feature) {
return;
}
this.feature.onRemoteSettingsUpdate(entries);
this.feature.notifyObservers();
},
registerAndRunExceptionListObserver(observer) {
// We don't await this; the caller is C++ and won't await this function,
// and because we prevent re-entering into this method, once it's been
// called once any subsequent calls will early-return anyway - so
// awaiting that would be meaningless. Instead, `Feature` implementations
// make sure not to call into observers until they have data, and we
// make sure to let feature instances know whether we have data
// immediately.
this.lazyInit();
this.feature.addAndRunObserver(observer);
},
unregisterExceptionListObserver(observer) {
if (!this.feature) {
return;
}
this.feature.removeObserver(observer);
},
};
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