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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.defineModuleGetter(
lazy,
"RemoteSettings",
"resource://services-settings/remote-settings.js"
);
const COLLECTION_NAME = "tracking-protection-lists";
// SafeBrowsing protocol parameters.
const SBRS_UPDATE_MINIMUM_DELAY = 21600; // Minimum delay before polling again in seconds
function UrlClassifierRemoteSettingsService() {}
UrlClassifierRemoteSettingsService.prototype = {
classID: Components.ID("{1980624c-c50b-4b46-a91c-dfaba7792706}"),
QueryInterface: ChromeUtils.generateQI([
"nsIUrlClassifierRemoteSettingsService",
]),
_initialized: false,
// Entries that are retrieved from RemoteSettings.get(). keyed by the table name.
_entries: {},
async lazyInit() {
if (this._initialized) {
return;
}
let rs = lazy.RemoteSettings(COLLECTION_NAME);
// Bug 1750191: Notify listmanager to trigger an update instead
// of polling data periodically.
rs.on("sync", async event => {
let {
data: { current },
} = event;
this._onUpdateEntries(current);
});
this._initialized = true;
let entries;
try {
entries = await rs.get();
} catch (e) {}
this._onUpdateEntries(entries || []);
},
_onUpdateEntries(aEntries) {
aEntries.map(entry => {
this._entries[entry.Name] = entry;
});
},
// Parse the update request. See UrlClassifierListManager.jsm makeUpdateRequest
// for more details about how we build the update request.
//
// @param aRequest the request payload of the update request
// @return array The array of requested tables. Each item in the array is composed
// with [table name, chunk numner]
_parseRequest(aRequest) {
let lines = aRequest.split("\n");
let requests = [];
for (let line of lines) {
let fields = line.split(";");
let chunkNum = fields[1]?.match(/(?<=a:).*/);
requests.push([fields[0], chunkNum]);
}
return requests;
},
async _getLists(aRequest, aListener) {
await this.lazyInit();
let rs = lazy.RemoteSettings(COLLECTION_NAME);
let payload = "n:" + SBRS_UPDATE_MINIMUM_DELAY + "\n";
let requests = this._parseRequest(aRequest);
for (let request of requests) {
let [reqTableName, reqChunkNum] = request;
let entry = this._entries[reqTableName];
if (!entry?.attachment) {
continue;
}
// If the request version is the same as what we have in Remote Settings,
// we are up-to-date now.
if (entry.Version == reqChunkNum) {
continue;
}
let downloadError = false;
try {
// SafeBrowsing maintains its own files, so we can remove the downloaded
// files after SafeBrowsing processes the data.
let buffer = await rs.attachments.downloadAsBytes(entry);
let bytes = new Uint8Array(buffer);
let strData = String.fromCharCode.apply(String, bytes);
// Construct the payload
payload += "i:" + reqTableName + "\n";
payload += strData;
} catch (e) {
downloadError = true;
}
if (downloadError) {
try {
aListener.onStartRequest(null);
aListener.onStopRequest(null, Cr.NS_ERROR_FAILURE);
} catch (e) {}
return;
}
}
// Send the update response over stream listener interface
let stream = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
Ci.nsIStringInputStream
);
stream.setData(payload, payload.length);
aListener.onStartRequest(null);
aListener.onDataAvailable(null, stream, 0, payload.length);
aListener.onStopRequest(null, Cr.NS_OK);
},
fetchList(aPayload, aListener) {
this._getLists(aPayload, aListener);
},
clear() {
this._initialized = false;
this._entries = {};
},
};
const EXPORTED_SYMBOLS = [
"UrlClassifierRemoteSettingsService",
"SBRS_UPDATE_MINIMUM_DELAY",
];
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