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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
import * as DefaultBackupResources from "resource:///modules/backup/BackupResources.sys.mjs";
import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
import { BackupResource } from "resource:///modules/backup/BackupResource.sys.mjs";
import {
MeasurementUtils,
BYTES_IN_KILOBYTE,
BYTES_IN_MEGABYTE,
BYTES_IN_MEBIBYTE,
} from "resource:///modules/backup/MeasurementUtils.sys.mjs";
import {
ERRORS,
STEPS,
} from "chrome://browser/content/backup/backup-constants.mjs";
import { BackupError } from "resource:///modules/backup/BackupError.mjs";
const BACKUP_DIR_PREF_NAME = "browser.backup.location";
const SCHEDULED_BACKUPS_ENABLED_PREF_NAME = "browser.backup.scheduled.enabled";
const IDLE_THRESHOLD_SECONDS_PREF_NAME =
"browser.backup.scheduled.idle-threshold-seconds";
const MINIMUM_TIME_BETWEEN_BACKUPS_SECONDS_PREF_NAME =
"browser.backup.scheduled.minimum-time-between-backups-seconds";
const LAST_BACKUP_TIMESTAMP_PREF_NAME =
"browser.backup.scheduled.last-backup-timestamp";
const LAST_BACKUP_FILE_NAME_PREF_NAME =
"browser.backup.scheduled.last-backup-file";
const SCHEMAS = Object.freeze({
BACKUP_MANIFEST: 1,
ARCHIVE_JSON_BLOCK: 2,
});
const lazy = {};
ChromeUtils.defineLazyGetter(lazy, "logConsole", function () {
return console.createInstance({
prefix: "BackupService",
maxLogLevel: Services.prefs.getBoolPref("browser.backup.log", false)
? "Debug"
: "Warn",
});
});
ChromeUtils.defineLazyGetter(lazy, "fxAccounts", () => {
return ChromeUtils.importESModule(
"resource://gre/modules/FxAccounts.sys.mjs"
).getFxAccountsSingleton();
});
ChromeUtils.defineESModuleGetters(lazy, {
AddonManager: "resource://gre/modules/AddonManager.sys.mjs",
ArchiveDecryptor: "resource:///modules/backup/ArchiveEncryption.sys.mjs",
ArchiveEncryptionState:
"resource:///modules/backup/ArchiveEncryptionState.sys.mjs",
ArchiveUtils: "resource:///modules/backup/ArchiveUtils.sys.mjs",
BasePromiseWorker: "resource://gre/modules/PromiseWorker.sys.mjs",
ClientID: "resource://gre/modules/ClientID.sys.mjs",
DeferredTask: "resource://gre/modules/DeferredTask.sys.mjs",
DownloadPaths: "resource://gre/modules/DownloadPaths.sys.mjs",
FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
JsonSchema: "resource://gre/modules/JsonSchema.sys.mjs",
NetUtil: "resource://gre/modules/NetUtil.sys.mjs",
});
ChromeUtils.defineLazyGetter(lazy, "ZipWriter", () =>
Components.Constructor("@mozilla.org/zipwriter;1", "nsIZipWriter", "open")
);
ChromeUtils.defineLazyGetter(lazy, "ZipReader", () =>
Components.Constructor(
"@mozilla.org/libjar/zip-reader;1",
"nsIZipReader",
"open"
)
);
ChromeUtils.defineLazyGetter(lazy, "nsLocalFile", () =>
Components.Constructor("@mozilla.org/file/local;1", "nsIFile", "initWithPath")
);
ChromeUtils.defineLazyGetter(lazy, "BinaryInputStream", () =>
Components.Constructor(
"@mozilla.org/binaryinputstream;1",
"nsIBinaryInputStream",
"setInputStream"
)
);
ChromeUtils.defineLazyGetter(lazy, "gFluentStrings", function () {
return new Localization(
["branding/brand.ftl", "preview/backupSettings.ftl"],
true
);
});
ChromeUtils.defineLazyGetter(lazy, "gDOMLocalization", function () {
return new DOMLocalization([
"branding/brand.ftl",
"preview/backupSettings.ftl",
]);
});
ChromeUtils.defineLazyGetter(lazy, "defaultParentDirPath", function () {
return Services.dirsvc.get("Docs", Ci.nsIFile).path;
});
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"scheduledBackupsPref",
SCHEDULED_BACKUPS_ENABLED_PREF_NAME,
false,
function onUpdateScheduledBackups(_pref, _prevVal, newVal) {
let bs = BackupService.get();
if (bs) {
bs.onUpdateScheduledBackups(newVal);
}
}
);
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"backupDirPref",
BACKUP_DIR_PREF_NAME,
/**
* To avoid disk access upon startup, do not set DEFAULT_PARENT_DIR_PATH
* as a fallback value here. Let registered widgets prompt BackupService
* to update the parentDirPath.
*
* @see BackupService.state
* @see DEFAULT_PARENT_DIR_PATH
* @see setParentDirPath
*/
null,
async function onUpdateLocationDirPath(_pref, _prevVal, newVal) {
let bs;
try {
bs = BackupService.get();
} catch (e) {
// This can throw if the BackupService hasn't initialized yet, which
// is a case we're okay to ignore.
}
if (bs) {
await bs.onUpdateLocationDirPath(newVal);
}
}
);
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"minimumTimeBetweenBackupsSeconds",
MINIMUM_TIME_BETWEEN_BACKUPS_SECONDS_PREF_NAME,
3600 /* 1 hour */
);
XPCOMUtils.defineLazyServiceGetter(
lazy,
"idleService",
"@mozilla.org/widget/useridleservice;1",
"nsIUserIdleService"
);
XPCOMUtils.defineLazyServiceGetter(
lazy,
"nativeOSKeyStore",
"@mozilla.org/security/oskeystore;1",
Ci.nsIOSKeyStore
);
/**
* A class that wraps a multipart/mixed stream converter instance, and streams
* in the binary part of a single-file archive (which should be at the second
* index of the attachments) as a ReadableStream.
*
* The bytes that are read in are text decoded, but are not guaranteed to
* represent a "full chunk" of base64 data. Consumers should ensure to buffer
* the strings emitted by this stream, and to search for `\n` characters, which
* indicate the end of a (potentially encrypted and) base64 encoded block.
*/
class BinaryReadableStream {
#channel = null;
/**
* Constructs a BinaryReadableStream.
*
* @param {nsIChannel} channel
* The channel through which to begin the flow of bytes from the
* inputStream
*/
constructor(channel) {
this.#channel = channel;
}
/**
* Implements `start` from the `underlyingSource` of a ReadableStream
*
* @param {ReadableStreamDefaultController} controller
* The controller for the ReadableStream to feed strings into.
*/
start(controller) {
let streamConv = Cc["@mozilla.org/streamConverters;1"].getService(
Ci.nsIStreamConverterService
);
let textDecoder = new TextDecoder();
// The attachment index that should contain the binary data.
const EXPECTED_CONTENT_TYPE = "application/octet-stream";
// This is fairly clumsy, but by using an object nsIStreamListener like
// this, I can keep from stashing the `controller` somewhere, as it's
// available in the closure.
let multipartListenerForBinary = {
/**
* True once we've found an attachment matching our EXPECTED_CONTENT_TYPE.
* Once this is true, bytes flowing into onDataAvailable will be
* enqueued through the controller.
*
* @type {boolean}
*/
_enabled: false,
/**
* True once onStopRequest has been called once the listener is enabled.
* After this, the listener will not attempt to read any data passed
* to it through onDataAvailable.
*
* @type {boolean}
*/
_done: false,
QueryInterface: ChromeUtils.generateQI([
"nsIStreamListener",
"nsIRequestObserver",
"nsIMultiPartChannelListener",
]),
/**
* Called when we begin to load an attachment from the MIME message.
*
* @param {nsIRequest} request
* The request corresponding to the source of the data.
*/
onStartRequest(request) {
if (!(request instanceof Ci.nsIChannel)) {
throw Components.Exception(
"onStartRequest expected an nsIChannel request",
Cr.NS_ERROR_UNEXPECTED
);
}
this._enabled = request.contentType == EXPECTED_CONTENT_TYPE;
},
/**
* Called when data is flowing in for an attachment.
*
* @param {nsIRequest} request
* The request corresponding to the source of the data.
* @param {nsIInputStream} stream
* The input stream containing the data chunk.
* @param {number} offset
* The number of bytes that were sent in previous onDataAvailable calls
* for this request. In other words, the sum of all previous count
* parameters.
* @param {number} count
* The number of bytes available in the stream
*/
onDataAvailable(request, stream, offset, count) {
if (!this._enabled) {
// We don't care about this data, just move on.
return;
}
let binStream = new lazy.BinaryInputStream(stream);
let bytes = new Uint8Array(count);
binStream.readArrayBuffer(count, bytes.buffer);
let string = textDecoder.decode(bytes);
controller.enqueue(string);
},
/**
* Called when the load of an attachment finishes.
*/
onStopRequest() {
if (this._enabled && !this._done) {
this._enabled = false;
this._done = true;
controller.close();
// No need to load anything else - abort reading in more
// attachments.
throw Components.Exception(
"Got binary block - cancelling loading the multipart stream.",
Cr.NS_BINDING_ABORTED
);
}
},
onAfterLastPart() {
if (!this._done) {
// We finished reading the parts before we found the binary block,
// so the binary block is missing.
controller.error(
new BackupError(
"Could not find binary block.",
ERRORS.CORRUPTED_ARCHIVE
)
);
}
},
};
let conv = streamConv.asyncConvertData(
"multipart/mixed",
"*/*",
multipartListenerForBinary,
null
);
this.#channel.asyncOpen(conv);
}
}
/**
* A TransformStream class that takes in chunks of base64 encoded data,
* decodes (and eventually, decrypts) them before passing the resulting
* bytes along to the next step in the pipe.
*
* The BinaryReadableStream feeds strings into this TransformStream, but the
* buffering of these streams means that we cannot be certain that the string
* that was passed is the entirety of a base64 encoded block. ArchiveWorker
* puts every block on its own line, meaning that we must simply look for
* newlines to indicate when a break between full blocks is, and buffer chunks
* until we see those breaks - only decoding once we have a full block.
*/
export class DecoderDecryptorTransformer {
#buffer = "";
#decryptor = null;
/**
* Constructs the DecoderDecryptorTransformer.
*
* @param {ArchiveDecryptor|null} decryptor
* An initialized ArchiveDecryptor, if this stream of bytes is presumed to
* be encrypted.
*/
constructor(decryptor) {
this.#decryptor = decryptor;
}
/**
* Consumes a single chunk of a base64 encoded string sent by
* BinaryReadableStream.
*
* @param {string} chunkPart
* A part of a chunk of a base64 encoded string sent by
* BinaryReadableStream.
* @param {TransformStreamDefaultController} controller
* The controller to send decoded bytes to.
* @returns {Promise<undefined>}
*/
async transform(chunkPart, controller) {
// A small optimization, but considering the size of these strings, it's
// likely worth it.
if (this.#buffer) {
this.#buffer += chunkPart;
} else {
this.#buffer = chunkPart;
}
// If the compressed archive was large enough, then it got split up over
// several chunks. In that case, each chunk is separated by a newline. We
// also filter out any extraneous newlines that might have been included
// at the end.
let chunks = this.#buffer.split("\n").filter(chunk => chunk != "");
this.#buffer = chunks.pop();
// If there were any remaining parts that we split out from the buffer,
// they must constitute full blocks that we can decode.
for (let chunk of chunks) {
await this.#processChunk(controller, chunk);
}
}
/**
* Called once BinaryReadableStream signals that it has sent all of its
* strings, in which case we know that whatever is in the buffer should be
* a valid block.
*
* @param {TransformStreamDefaultController} controller
* The controller to send decoded bytes to.
* @returns {Promise<undefined>}
*/
async flush(controller) {
await this.#processChunk(controller, this.#buffer, true);
this.#buffer = "";
}
/**
* Decodes (and potentially decrypts) a valid base64 encoded chunk into a
* Uint8Array and sends it to the next step in the pipe.
*
* @param {TransformStreamDefaultController} controller
* The controller to send decoded bytes to.
* @param {string} chunk
* The base64 encoded string to decode and potentially decrypt.
* @param {boolean} [isLastChunk=false]
* True if this is the last chunk to be processed.
* @returns {Promise<undefined>}
*/
async #processChunk(controller, chunk, isLastChunk = false) {
try {
let bytes = lazy.ArchiveUtils.stringToArray(chunk);
if (this.#decryptor) {
let plaintextBytes = await this.#decryptor.decrypt(bytes, isLastChunk);
controller.enqueue(plaintextBytes);
} else {
controller.enqueue(bytes);
}
} catch (e) {
// Something went wrong base64 decoding or decrypting. Tell the controller
// that we're done, so that it can destroy anything that was decoded /
// decrypted already.
controller.error("Corrupted archive.");
}
}
}
/**
* A class that lets us construct a WritableStream that writes bytes to a file
* on disk somewhere.
*/
export class FileWriterStream {
/**
* @type {string}
*/
#destPath = null;
/**
* @type {nsIOutputStream}
*/
#outStream = null;
/**
* @type {nsIBinaryOutputStream}
*/
#binStream = null;
/**
* @type {ArchiveDecryptor}
*/
#decryptor = null;
/**
* Constructor for FileWriterStream.
*
* @param {string} destPath
* The path to write the incoming bytes to.
* @param {ArchiveDecryptor|null} decryptor
* An initialized ArchiveDecryptor, if this stream of bytes is presumed to
* be encrypted.
*/
constructor(destPath, decryptor) {
this.#destPath = destPath;
this.#decryptor = decryptor;
}
/**
* Called once the first set of bytes comes in from the
* DecoderDecryptorTransformer. This creates the file, and sets up the
* underlying nsIOutputStream mechanisms to let us write bytes to the file.
*/
async start() {
let extractionDestFile = await IOUtils.getFile(this.#destPath);
this.#outStream =
lazy.FileUtils.openSafeFileOutputStream(extractionDestFile);
this.#binStream = Cc["@mozilla.org/binaryoutputstream;1"].createInstance(
Ci.nsIBinaryOutputStream
);
this.#binStream.setOutputStream(this.#outStream);
}
/**
* Writes bytes to the destination on the file system.
*
* @param {Uint8Array} chunk
* The bytes to stream to the destination file.
*/
write(chunk) {
this.#binStream.writeByteArray(chunk);
}
/**
* Called once the stream of bytes finishes flowing in and closes the stream.
*
* @param {WritableStreamDefaultController} controller
* The controller for the WritableStream.
*/
close(controller) {
lazy.FileUtils.closeSafeFileOutputStream(this.#outStream);
if (this.#decryptor && !this.#decryptor.isDone()) {
lazy.logConsole.error(
"Decryptor was not done when the stream was closed."
);
controller.error("Corrupted archive.");
}
}
/**
* Called if something went wrong while decoding / decrypting the stream of
* bytes. This destroys any bytes that may have been decoded / decrypted
* prior to the error.
*
* @param {string} reason
* The reported reason for aborting the decoding / decrpytion.
*/
async abort(reason) {
lazy.logConsole.error(`Writing to ${this.#destPath} failed: `, reason);
lazy.FileUtils.closeSafeFileOutputStream(this.#outStream);
await IOUtils.remove(this.#destPath, {
ignoreAbsent: true,
retryReadonly: true,
});
}
}
/**
* The BackupService class orchestrates the scheduling and creation of profile
* backups. It also does most of the heavy lifting for the restoration of a
* profile backup.
*/
export class BackupService extends EventTarget {
/**
* The BackupService singleton instance.
*
* @static
* @type {BackupService|null}
*/
static #instance = null;
/**
* Map of instantiated BackupResource classes.
*
* @type {Map<string, BackupResource>}
*/
#resources = new Map();
/**
* The name of the backup folder. Should be localized.
*
* @see BACKUP_DIR_NAME
*/
static #backupFolderName = null;
/**
* The name of the backup archive file. Should be localized.
*
* @see BACKUP_FILE_NAME
*/
static #backupFileName = null;
/**
* Set to true if a backup is currently in progress. Causes stateUpdate()
* to be called.
*
* @see BackupService.stateUpdate()
* @param {boolean} val
* True if a backup is in progress.
*/
set #backupInProgress(val) {
if (this.#_state.backupInProgress != val) {
this.#_state.backupInProgress = val;
this.stateUpdate();
}
}
/**
* True if a backup is currently in progress.
*
* @type {boolean}
*/
get #backupInProgress() {
return this.#_state.backupInProgress;
}
/**
* Dispatches an event to let listeners know that the BackupService state
* object has been updated.
*/
stateUpdate() {
this.dispatchEvent(new CustomEvent("BackupService:StateUpdate"));
}
/**
* True if a recovery is currently in progress.
*
* @type {boolean}
*/
#recoveryInProgress = false;
/**
* An object holding the current state of the BackupService instance, for
* the purposes of representing it in the user interface. Ideally, this would
* be named #state instead of #_state, but sphinx-js seems to be fairly
* unhappy with that coupled with the ``state`` getter.
*
* @type {object}
*/
#_state = {
backupDirPath: lazy.backupDirPref,
defaultParent: {},
backupFileToRestore: null,
backupFileInfo: null,
backupInProgress: false,
scheduledBackupsEnabled: lazy.scheduledBackupsPref,
encryptionEnabled: false,
/** @type {number?} Number of seconds since UNIX epoch */
lastBackupDate: null,
lastBackupFileName: "",
supportBaseLink: Services.urlFormatter.formatURLPref("app.support.baseURL"),
};
/**
* A Promise that will resolve once the postRecovery steps are done. It will
* also resolve if postRecovery steps didn't need to run.
*
* @see BackupService.checkForPostRecovery()
* @type {Promise<undefined>}
*/
#postRecoveryPromise;
/**
* The resolving function for #postRecoveryPromise, which should be called
* by checkForPostRecovery() before exiting.
*
* @type {Function}
*/
#postRecoveryResolver;
/**
* The currently used ArchiveEncryptionState. Callers should use
* loadEncryptionState() instead, to ensure that any pre-serialized
* encryption state has been read in and deserialized.
*
* This member can be in 3 states:
*
* 1. undefined - no attempt has been made to load encryption state from
* disk yet.
* 2. null - encryption is not enabled.
* 3. ArchiveEncryptionState - encryption is enabled.
*
* @see BackupService.loadEncryptionState()
* @type {ArchiveEncryptionState|null|undefined}
*/
#encState = undefined;
/**
* The PlacesObserver instance used to monitor the Places database for
* history and bookmark removals to determine if backups should be
* regenerated.
*
* @type {PlacesObserver|null}
*/
#placesObserver = null;
/**
* The AbortController used to abort any queued requests to create or delete
* backups that might be waiting on the WRITE_BACKUP_LOCK_NAME lock.
*
* @type {AbortController}
*/
#backupWriteAbortController = null;
/**
* A DeferredTask that will cause the last known backup to be deleted, and
* a new backup to be created.
*
* See BackupService.#debounceRegeneration()
*
* @type {DeferredTask}
*/
#regenerationDebouncer = null;
/**
* True if takeMeasurements has been called and various measurements related
* to the BackupService have been taken.
*
* @type {boolean}
*/
#takenMeasurements = false;
/**
* The path of the default parent directory for saving backups.
* The current default is the Documents directory.
*
* @returns {string} The path of the default parent directory
*/
static get DEFAULT_PARENT_DIR_PATH() {
return lazy.defaultParentDirPath;
}
/**
* The localized name for the user's backup folder.
*
* @returns {string} The localized backup folder name
*/
static get BACKUP_DIR_NAME() {
if (!BackupService.#backupFolderName) {
BackupService.#backupFolderName = lazy.DownloadPaths.sanitize(
lazy.gFluentStrings.formatValueSync("backup-folder-name")
);
}
return BackupService.#backupFolderName;
}
/**
* The localized name for the user's backup archive file. This will have
* `.html` appended to it before writing the archive file.
*
* @returns {string} The localized backup file name
*/
static get BACKUP_FILE_NAME() {
if (!BackupService.#backupFileName) {
BackupService.#backupFileName = lazy.DownloadPaths.sanitize(
lazy.gFluentStrings.formatValueSync("backup-file-name")
);
}
return BackupService.#backupFileName;
}
/**
* The name of the folder within the profile folder where this service reads
* and writes state to.
*
* @type {string}
*/
static get PROFILE_FOLDER_NAME() {
return "backups";
}
/**
* The name of the folder within the PROFILE_FOLDER_NAME where the staging
* folder / prior backups will be stored.
*
* @type {string}
*/
static get SNAPSHOTS_FOLDER_NAME() {
return "snapshots";
}
/**
* The name of the backup manifest file.
*
* @type {string}
*/
static get MANIFEST_FILE_NAME() {
return "backup-manifest.json";
}
/**
* A promise that resolves to the schema for the backup manifest that this
* BackupService uses when creating a backup. This should be accessed via
* the `MANIFEST_SCHEMA` static getter.
*
* @type {Promise<object>}
*/
static #manifestSchemaPromise = null;
/**
* The current schema version of the backup manifest that this BackupService
* uses when creating a backup.
*
* @type {Promise<object>}
*/
static get MANIFEST_SCHEMA() {
if (!BackupService.#manifestSchemaPromise) {
BackupService.#manifestSchemaPromise = BackupService.getSchemaForVersion(
SCHEMAS.BACKUP_MANIFEST,
lazy.ArchiveUtils.SCHEMA_VERSION
);
}
return BackupService.#manifestSchemaPromise;
}
/**
* The name of the post recovery file written into the newly created profile
* directory just after a profile is recovered from a backup.
*
* @type {string}
*/
static get POST_RECOVERY_FILE_NAME() {
return "post-recovery.json";
}
/**
* The name of the serialized ArchiveEncryptionState that is written to disk
* if encryption is enabled.
*
* @type {string}
*/
static get ARCHIVE_ENCRYPTION_STATE_FILE() {
return "enc-state.json";
}
/**
* Returns the SCHEMAS constants, which is a key/value store of constants.
*
* @type {object}
*/
static get SCHEMAS() {
return SCHEMAS;
}
/**
* Returns the filename used for the intermediary compressed ZIP file that
* is extracted from archives during recovery.
*
* @type {string}
*/
static get RECOVERY_ZIP_FILE_NAME() {
return "recovery.zip";
}
/**
* Returns the schema for the schemaType for a given version.
*
* @param {number} schemaType
* One of the constants from SCHEMAS.
* @param {number} version
* The version of the schema to return.
* @returns {Promise<object>}
*/
static async getSchemaForVersion(schemaType, version) {
let schemaURL;
if (schemaType == SCHEMAS.BACKUP_MANIFEST) {
} else if (schemaType == SCHEMAS.ARCHIVE_JSON_BLOCK) {
} else {
throw new BackupError(
`Did not recognize SCHEMAS constant: ${schemaType}`,
ERRORS.UNKNOWN
);
}
let response = await fetch(schemaURL);
return response.json();
}
/**
* The level of Zip compression to use on the zipped staging folder.
*
* @type {number}
*/
static get COMPRESSION_LEVEL() {
return Ci.nsIZipWriter.COMPRESSION_BEST;
}
/**
* Returns the chrome:// URI string for the template that should be used to
* construct the single-file archive.
*
* @type {string}
*/
static get ARCHIVE_TEMPLATE() {
return "chrome://browser/content/backup/archive.template.html";
}
/**
* The native OSKeyStore label used for the temporary recovery store. The
* temporary recovery store is initialized with the original OSKeyStore
* secret that was included in an encrypted backup, and then used by any
* BackupResource's that need to decrypt / re-encrypt OSKeyStore secrets for
* the current device.
*
* @type {string}
*/
static get RECOVERY_OSKEYSTORE_LABEL() {
return AppConstants.MOZ_APP_BASENAME + " Backup Recovery Storage";
}
/**
* The name of the exclusive Web Lock that will be requested and held when
* creating or deleting a backup.
*
* @type {string}
*/
static get WRITE_BACKUP_LOCK_NAME() {
return "write-backup";
}
/**
* The amount of time (in milliseconds) to wait for our backup regeneration
* debouncer to kick off a regeneration.
*
* @type {number}
*/
static get REGENERATION_DEBOUNCE_RATE_MS() {
return 10000;
}
/**
* Returns a reference to a BackupService singleton. If this is the first time
* that this getter is accessed, this causes the BackupService singleton to be
* be instantiated.
*
* @static
* @type {BackupService}
*/
static init() {
if (this.#instance) {
return this.#instance;
}
this.#instance = new BackupService(DefaultBackupResources);
this.#instance.checkForPostRecovery();
this.#instance.initBackupScheduler();
return this.#instance;
}
/**
* Returns a reference to the BackupService singleton. If the singleton has
* not been initialized, an error is thrown.
*
* @static
* @returns {BackupService}
*/
static get() {
if (!this.#instance) {
throw new BackupError(
"BackupService not initialized",
ERRORS.UNINITIALIZED
);
}
return this.#instance;
}
/**
* Create a BackupService instance.
*
* @param {object} [backupResources=DefaultBackupResources]
* Object containing BackupResource classes to associate with this service.
*/
constructor(backupResources = DefaultBackupResources) {
super();
lazy.logConsole.debug("Instantiated");
for (const resourceName in backupResources) {
let resource = backupResources[resourceName];
this.#resources.set(resource.key, resource);
}
let { promise, resolve } = Promise.withResolvers();
this.#postRecoveryPromise = promise;
this.#postRecoveryResolver = resolve;
this.#backupWriteAbortController = new AbortController();
this.#regenerationDebouncer = new lazy.DeferredTask(async () => {
if (!this.#backupWriteAbortController.signal.aborted) {
await this.deleteLastBackup();
if (lazy.scheduledBackupsPref) {
await this.createBackupOnIdleDispatch();
}
}
}, BackupService.REGENERATION_DEBOUNCE_RATE_MS);
}
/**
* Returns a reference to a Promise that will resolve with undefined once
* postRecovery steps have had a chance to run. This will also be resolved
* with undefined if no postRecovery steps needed to be run.
*
* @see BackupService.checkForPostRecovery()
* @returns {Promise<undefined>}
*/
get postRecoveryComplete() {
return this.#postRecoveryPromise;
}
/**
* Returns a state object describing the state of the BackupService for the
* purposes of representing it in the user interface. The returned state
* object is immutable.
*
* @type {object}
*/
get state() {
if (!Object.keys(this.#_state.defaultParent).length) {
let defaultPath = BackupService.DEFAULT_PARENT_DIR_PATH;
this.#_state.defaultParent = {
path: defaultPath,
fileName: PathUtils.filename(defaultPath),
iconURL: this.getIconFromFilePath(defaultPath),
};
}
return Object.freeze(structuredClone(this.#_state));
}
/**
* Attempts to find the right folder to write the single-file archive to, and
* if it does not exist, to create it.
*
* If the configured destination's parent folder does not exist and cannot
* be recreated, we will fall back to the `defaultParentDirPath`. If
* `defaultParentDirPath` happens to not exist or cannot be created, we will
* fall back to the home directory. If _that_ folder does not exist and cannot
* be recreated, this method will reject.
*
* @param {string} configuredDestFolderPath
* The currently configured destination folder for the archive.
* @returns {Promise<string, Error>}
*/
async resolveArchiveDestFolderPath(configuredDestFolderPath) {
lazy.logConsole.log(
"Resolving configured archive destination folder: ",
configuredDestFolderPath
);
// Try to create the configured folder ancestry. If that fails, we clear
// configuredDestFolderPath so that we can try the fallback paths, as
// if the folder was never set.
try {
await IOUtils.makeDirectory(configuredDestFolderPath, {
createAncestors: true,
ignoreExisting: true,
});
return configuredDestFolderPath;
} catch (e) {
lazy.logConsole.warn("Could not create configured destination path: ", e);
}
lazy.logConsole.warn(
"The destination directory was invalid. Attempting to fall back to " +
"default parent folder: ",
BackupService.DEFAULT_PARENT_DIR_PATH
);
let fallbackFolderPath = PathUtils.join(
BackupService.DEFAULT_PARENT_DIR_PATH,
BackupService.BACKUP_DIR_NAME
);
try {
await IOUtils.makeDirectory(fallbackFolderPath, {
createAncestors: true,
ignoreExisting: true,
});
return fallbackFolderPath;
} catch (e) {
lazy.logConsole.warn("Could not create fallback destination path: ", e);
}
let homeDirPath = PathUtils.join(
Services.dirsvc.get("Home", Ci.nsIFile).path,
BackupService.BACKUP_DIR_NAME
);
lazy.logConsole.warn(
"The destination directory was invalid. Attempting to fall back to " +
"Home folder: ",
homeDirPath
);
try {
await IOUtils.makeDirectory(homeDirPath, {
createAncestors: true,
ignoreExisting: true,
});
return homeDirPath;
} catch (e) {
lazy.logConsole.warn("Could not create Home destination path: ", e);
throw new Error(
"Could not resolve to a writable destination folder path.",
{ cause: ERRORS.FILE_SYSTEM_ERROR }
);
}
}
/**
* Computes the appropriate link to place in the single-file archive for
* downloading a version of this application for the same update channel.
*
* links available in Remote Settings.
*
* If there aren't any, we will fallback by looking for preference values at
* browser.backup.template.fallback-download.${updateChannel}.
*
* If no such preference exists, a final "ultimate" fallback download link is
* chosen for the release channel.
*
* @param {string} updateChannel
* The current update channel for the application, as provided by
* AppConstants.MOZ_UPDATE_CHANNEL.
* @returns {Promise<string>}
*/
async resolveDownloadLink(updateChannel) {
// If all else fails, this is the download link we'll put into the rendered
// template.
const ULTIMATE_FALLBACK_DOWNLOAD_URL =
const FALLBACK_DOWNLOAD_URL = Services.prefs.getStringPref(
`browser.backup.template.fallback-download.${updateChannel}`,
ULTIMATE_FALLBACK_DOWNLOAD_URL
);
// query for them here.
return FALLBACK_DOWNLOAD_URL;
}
/**
* @typedef {object} CreateBackupResult
* @property {object} manifest
* The backup manifest data of the created backup. See BackupManifest
* schema for specific details.
* @property {string} archivePath
* The path to the single file archive that was created.
*/
/**
* Create a backup of the user's profile.
*
* @param {object} [options]
* Options for the backup.
* @param {string} [options.profilePath=PathUtils.profileDir]
* The path to the profile to backup. By default, this is the current
* profile.
* @returns {Promise<CreateBackupResult|null>}
* A promise that resolves to information about the backup that was
* created, or null if the backup failed.
*/
async createBackup({ profilePath = PathUtils.profileDir } = {}) {
// createBackup does not allow re-entry or concurrent backups.
if (this.#backupInProgress) {
lazy.logConsole.warn("Backup attempt already in progress");
return null;
}
return locks.request(
BackupService.WRITE_BACKUP_LOCK_NAME,
{ signal: this.#backupWriteAbortController.signal },
async () => {
let currentStep = STEPS.CREATE_BACKUP_ENTRYPOINT;
this.#backupInProgress = true;
const backupTimer = Glean.browserBackup.totalBackupTime.start();
try {
lazy.logConsole.debug(
`Creating backup for profile at ${profilePath}`
);
currentStep = STEPS.CREATE_BACKUP_RESOLVE_DESTINATION;
let archiveDestFolderPath = await this.resolveArchiveDestFolderPath(
lazy.backupDirPref
);
lazy.logConsole.debug(
`Destination for archive: ${archiveDestFolderPath}`
);
currentStep = STEPS.CREATE_BACKUP_CREATE_MANIFEST;
let manifest = await this.#createBackupManifest();
currentStep = STEPS.CREATE_BACKUP_CREATE_BACKUPS_FOLDER;
// First, check to see if a `backups` directory already exists in the
// profile.
let backupDirPath = PathUtils.join(
profilePath,
BackupService.PROFILE_FOLDER_NAME,
BackupService.SNAPSHOTS_FOLDER_NAME
);
lazy.logConsole.debug("Creating backups folder");
// ignoreExisting: true is the default, but we're being explicit that it's
// okay if this folder already exists.
await IOUtils.makeDirectory(backupDirPath, {
ignoreExisting: true,
createAncestors: true,
});
currentStep = STEPS.CREATE_BACKUP_CREATE_STAGING_FOLDER;
let stagingPath = await this.#prepareStagingFolder(backupDirPath);
// Sort resources be priority.
let sortedResources = Array.from(this.#resources.values()).sort(
(a, b) => {
return b.priority - a.priority;
}
);
currentStep = STEPS.CREATE_BACKUP_LOAD_ENCSTATE;
let encState = await this.loadEncryptionState(profilePath);
let encryptionEnabled = !!encState;
lazy.logConsole.debug("Encryption enabled: ", encryptionEnabled);
currentStep = STEPS.CREATE_BACKUP_RUN_BACKUP;
// Perform the backup for each resource.
for (let resourceClass of sortedResources) {
try {
lazy.logConsole.debug(
`Backing up resource with key ${resourceClass.key}. ` +
`Requires encryption: ${resourceClass.requiresEncryption}`
);
if (resourceClass.requiresEncryption && !encryptionEnabled) {
lazy.logConsole.debug(
"Encryption is not currently enabled. Skipping."
);
continue;
}
let resourcePath = PathUtils.join(stagingPath, resourceClass.key);
await IOUtils.makeDirectory(resourcePath);
// `backup` on each BackupResource should return us a ManifestEntry
// that we eventually write to a JSON manifest file, but for now,
// we're just going to log it.
let manifestEntry = await new resourceClass().backup(
resourcePath,
profilePath,
encryptionEnabled
);
if (manifestEntry === undefined) {
lazy.logConsole.error(
`Backup of resource with key ${resourceClass.key} returned undefined
as its ManifestEntry instead of null or an object`
);
} else {
lazy.logConsole.debug(
`Backup of resource with key ${resourceClass.key} completed`,
manifestEntry
);
manifest.resources[resourceClass.key] = manifestEntry;
}
} catch (e) {
lazy.logConsole.error(
`Failed to backup resource: ${resourceClass.key}`,
e
);
}
}
currentStep = STEPS.CREATE_BACKUP_VERIFY_MANIFEST;
// Ensure that the manifest abides by the current schema, and log
// an error if somehow it doesn't. We'll want to collect telemetry for
// this case to make sure it's not happening in the wild. We debated
// throwing an exception here too, but that's not meaningfully better
// than creating a backup that's not schema-compliant. At least in this
// case, a user so-inclined could theoretically repair the manifest
// to make it valid.
let manifestSchema = await BackupService.MANIFEST_SCHEMA;
let schemaValidationResult = lazy.JsonSchema.validate(
manifest,
manifestSchema
);
if (!schemaValidationResult.valid) {
lazy.logConsole.error(
"Backup manifest does not conform to schema:",
manifest,
manifestSchema,
schemaValidationResult
);
}
currentStep = STEPS.CREATE_BACKUP_WRITE_MANIFEST;
// Write the manifest to the staging folder.
let manifestPath = PathUtils.join(
stagingPath,
BackupService.MANIFEST_FILE_NAME
);
await IOUtils.writeJSON(manifestPath, manifest);
currentStep = STEPS.CREATE_BACKUP_FINALIZE_STAGING;
let renamedStagingPath = await this.#finalizeStagingFolder(
stagingPath
);
lazy.logConsole.log(
"Wrote backup to staging directory at ",
renamedStagingPath
);
// Record the total size of the backup staging directory
let totalSizeKilobytes = await BackupResource.getDirectorySize(
renamedStagingPath
);
let totalSizeBytesNearestMebibyte = MeasurementUtils.fuzzByteSize(
totalSizeKilobytes * BYTES_IN_KILOBYTE,
1 * BYTES_IN_MEBIBYTE
);
lazy.logConsole.debug(
"total staging directory size in bytes: " +
totalSizeBytesNearestMebibyte
);
Glean.browserBackup.totalBackupSize.accumulate(
totalSizeBytesNearestMebibyte / BYTES_IN_MEBIBYTE
);
currentStep = STEPS.CREATE_BACKUP_COMPRESS_STAGING;
let compressedStagingPath = await this.#compressStagingFolder(
renamedStagingPath,
backupDirPath
).finally(async () => {
await IOUtils.remove(renamedStagingPath, { recursive: true });
});
currentStep = STEPS.CREATE_BACKUP_CREATE_ARCHIVE;
// Now create the single-file archive. For now, we'll stash this in the
// backups folder while it gets written. Once that's done, we'll attempt
// to move it to the user's configured backup path.
let archiveTmpPath = PathUtils.join(backupDirPath, "archive.html");
lazy.logConsole.log(
"Exporting single-file archive to ",
archiveTmpPath
);
await this.createArchive(
archiveTmpPath,
BackupService.ARCHIVE_TEMPLATE,
compressedStagingPath,
this.#encState,
manifest.meta
).finally(async () => {
await IOUtils.remove(compressedStagingPath);
});
// Record the size of the complete single-file archive
let archiveSizeKilobytes = await BackupResource.getFileSize(
archiveTmpPath
);
let archiveSizeBytesNearestMebibyte = MeasurementUtils.fuzzByteSize(
archiveSizeKilobytes * BYTES_IN_KILOBYTE,
1 * BYTES_IN_MEBIBYTE
);
lazy.logConsole.debug(
"backup archive size in bytes: " + archiveSizeBytesNearestMebibyte
);
Glean.browserBackup.compressedArchiveSize.accumulate(
archiveSizeBytesNearestMebibyte / BYTES_IN_MEBIBYTE
);
currentStep = STEPS.CREATE_BACKUP_FINALIZE_ARCHIVE;
let archivePath = await this.finalizeSingleFileArchive(
archiveTmpPath,
archiveDestFolderPath,
manifest.meta
);
let nowSeconds = Math.floor(Date.now() / 1000);
Services.prefs.setIntPref(
LAST_BACKUP_TIMESTAMP_PREF_NAME,
nowSeconds
);
this.#_state.lastBackupDate = nowSeconds;
Glean.browserBackup.totalBackupTime.stopAndAccumulate(backupTimer);
Glean.browserBackup.created.record();
return { manifest, archivePath };
} catch (e) {
Glean.browserBackup.totalBackupTime.cancel(backupTimer);
Glean.browserBackup.error.record({
error_code: String(e.cause || ERRORS.UNKNOWN),
backup_step: String(currentStep),
});
return null;
} finally {
this.#backupInProgress = false;
}
}
);
}
/**
* Generates a string from a Date in the form of:
*
* YYYYMMDD-HHMM
*
* @param {Date} date
* The date to convert into the archive date suffix.
* @returns {string}
*/
generateArchiveDateSuffix(date) {
let year = date.getFullYear().toString();
// In all cases, months or days with single digits are expected to start
// with a 0.
// Note that getMonth() is 0-indexed for some reason, so we increment by 1.
let month = `${date.getMonth() + 1}`.padStart(2, "0");
let day = `${date.getDate()}`.padStart(2, "0");
let hours = `${date.getHours()}`.padStart(2, "0");
let minutes = `${date.getMinutes()}`.padStart(2, "0");
return `${year}${month}${day}-${hours}${minutes}`;
}
/**
* Moves the single-file archive into its configured location with a filename
* that is sanitized and contains a timecode. This also removes any existing
* single-file archives in that same folder after the move completes.
*
* @param {string} sourcePath
* The file system location of the single-file archive prior to the move.
* @param {string} destFolder
* The folder that the single-file archive is configured to be eventually
* written to.
* @param {object} metadata
* The metadata for the backup. See the BackupManifest schema for details.
* @returns {Promise<string>}
* Resolves with the path that the single-file archive was moved to.
*/
async finalizeSingleFileArchive(sourcePath, destFolder, metadata) {
let archiveDateSuffix = this.generateArchiveDateSuffix(
new Date(metadata.date)
);
let existingChildren = await IOUtils.getChildren(destFolder);
const FILENAME_PREFIX = `${BackupService.BACKUP_FILE_NAME}_${metadata.profileName}`;
const FILENAME = `${FILENAME_PREFIX}_${archiveDateSuffix}.html`;
let destPath = PathUtils.join(destFolder, FILENAME);
lazy.logConsole.log("Moving single-file archive to ", destPath);
await IOUtils.move(sourcePath, destPath);
Services.prefs.setStringPref(LAST_BACKUP_FILE_NAME_PREF_NAME, FILENAME);
// It is expected that our caller will call stateUpdate(), so we skip doing
// that here. This is done via the backupInProgress setter in createBackup.
this.#_state.lastBackupFileName = FILENAME;
for (let childFilePath of existingChildren) {
let childFileName = PathUtils.filename(childFilePath);
// We check both the prefix and the suffix, because the prefix encodes
// the profile name in it. If there are other profiles from the same
// application performing backup, we don't want to accidentally remove
// those.
if (
childFileName.startsWith(FILENAME_PREFIX) &&
childFileName.endsWith(".html")
) {
if (childFileName == FILENAME) {
// Since filenames don't include seconds, this might occur if a
// backup was created seconds after the last one during the same
// minute. That tends not to happen in practice, but might occur
// during testing, in which case, we'll skip clearing this file.
lazy.logConsole.warn(
"Collided with a pre-existing archive name, so not clearing: ",
FILENAME
);
continue;
}
lazy.logConsole.debug("Getting rid of ", childFilePath);
await IOUtils.remove(childFilePath);
}
}
return destPath;
}
/**
* Constructs the staging folder for the backup in the passed in backup
* folder. If a pre-existing staging folder exists, it will be cleared out.
*
* @param {string} backupDirPath
* The path to the backup folder.
* @returns {Promise<string>}
* The path to the empty staging folder.
*/
async #prepareStagingFolder(backupDirPath) {
let stagingPath = PathUtils.join(backupDirPath, "staging");
lazy.logConsole.debug("Checking for pre-existing staging folder");
if (await IOUtils.exists(stagingPath)) {
// A pre-existing staging folder exists. A previous backup attempt must
// have failed or been interrupted. We'll clear it out.
lazy.logConsole.warn("A pre-existing staging folder exists. Clearing.");
await IOUtils.remove(stagingPath, { recursive: true });
}
await IOUtils.makeDirectory(stagingPath);
return stagingPath;
}
/**
* Compresses a staging folder into a Zip file. If a pre-existing Zip file
* for a staging folder resides in destFolderPath, it is overwritten. The
* Zip file will have the same name as the stagingPath folder, with `.zip`
* as the extension.
*
* @param {string} stagingPath
* The path to the staging folder to be compressed.
* @param {string} destFolderPath
* The parent folder to write the Zip file to.
* @returns {Promise<string>}
* Resolves with the path to the created Zip file.
*/
async #compressStagingFolder(stagingPath, destFolderPath) {
const PR_RDWR = 0x04;
const PR_CREATE_FILE = 0x08;
const PR_TRUNCATE = 0x20;
let archivePath = PathUtils.join(
destFolderPath,
`${PathUtils.filename(stagingPath)}.zip`
);
let archiveFile = await IOUtils.getFile(archivePath);
let writer = new lazy.ZipWriter(
archiveFile,
PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE
);
lazy.logConsole.log("Compressing staging folder to ", archivePath);
let rootPathNSIFile = await IOUtils.getDirectory(stagingPath);
await this.#compressChildren(rootPathNSIFile, stagingPath, writer);
await new Promise(resolve => {
let observer = {
onStartRequest(_request) {
lazy.logConsole.debug("Starting to write out archive file");
},
onStopRequest(_request, status) {
lazy.logConsole.log("Done writing archive file");
resolve(status);
},
};
writer.processQueue(observer, null);
});
writer.close();
return archivePath;
}
/**
* A helper function for #compressStagingFolder that iterates through a
* directory, and adds each file to a nsIZipWriter. For each directory it
* finds, it recurses.
*
* @param {nsIFile} rootPathNSIFile
* An nsIFile pointing at the root of the folder being compressed.
* @param {string} parentPath
* The path to the folder whose children should be iterated.
* @param {nsIZipWriter} writer
* The writer to add all of the children to.
* @returns {Promise<undefined>}
*/
async #compressChildren(rootPathNSIFile, parentPath, writer) {
let children = await IOUtils.getChildren(parentPath);
for (let childPath of children) {
let childState = await IOUtils.stat(childPath);
if (childState.type == "directory") {
await this.#compressChildren(rootPathNSIFile, childPath, writer);
} else {
let childFile = await IOUtils.getFile(childPath);
// nsIFile.getRelativePath returns paths using the "/" separator,
// regardless of which platform we're on. That's handy, because this
// is the same separator that nsIZipWriter expects for entries.
let pathRelativeToRoot = childFile.getRelativePath(rootPathNSIFile);
writer.addEntryFile(
pathRelativeToRoot,
BackupService.COMPRESSION_LEVEL,
childFile,
true
);
}
}
}
/**
* Decompressed a compressed recovery file into recoveryFolderDestPath.
*
* @param {string} recoveryFilePath
* The path to the compressed recovery file to decompress.
* @param {string} recoveryFolderDestPath
* The path to the folder that the compressed recovery file should be
* decompressed within.
* @returns {Promise<undefined>}
*/
async decompressRecoveryFile(recoveryFilePath, recoveryFolderDestPath) {
let recoveryFile = await IOUtils.getFile(recoveryFilePath);
let recoveryArchive = new lazy.ZipReader(recoveryFile);
lazy.logConsole.log(
"Decompressing recovery folder to ",
recoveryFolderDestPath
);
try {
// null is passed to test if we're meant to CRC test the entire
// ZIP file. If an exception is thrown, this means we failed the CRC
// check. See the nsIZipReader.idl documentation for details.
recoveryArchive.test(null);
} catch (e) {
recoveryArchive.close();
lazy.logConsole.error("Compressed recovery file was corrupt.");
await IOUtils.remove(recoveryFilePath, {
retryReadonly: true,
});
throw new BackupError("Corrupt archive.", ERRORS.CORRUPTED_ARCHIVE);
}
await this.#decompressChildren(recoveryFolderDestPath, "", recoveryArchive);
recoveryArchive.close();
}
/**
* A helper method that recursively decompresses any children within a folder
* within a compressed archive.
*
* @param {string} rootPath
* The path to the root folder that is being decompressed into.
* @param {string} parentEntryName
* The name of the parent folder within the compressed archive that is
* having its children decompressed.
* @param {nsIZipReader} reader
* The nsIZipReader for the compressed archive.
* @returns {Promise<undefined>}
*/
async #decompressChildren(rootPath, parentEntryName, reader) {
// nsIZipReader.findEntries has an interesting querying language that is
// documented in the nsIZipReader IDL file, in case you're curious about
// what these symbols mean.
let childEntryNames = reader.findEntries(
parentEntryName + "?*~" + parentEntryName + "?*/?*"
);
for (let childEntryName of childEntryNames) {
let childEntry = reader.getEntry(childEntryName);
if (childEntry.isDirectory) {
await this.#decompressChildren(rootPath, childEntryName, reader);
} else {
let inputStream = reader.getInputStream(childEntryName);
// ZIP files all use `/` as their path separators, regardless of
// platform.
let fileNameParts = childEntryName.split("/");
let outputFilePath = PathUtils.join(rootPath, ...fileNameParts);
let outputFile = await IOUtils.getFile(outputFilePath);
let outputStream = Cc[
"@mozilla.org/network/file-output-stream;1"
].createInstance(Ci.nsIFileOutputStream);
outputStream.init(
outputFile,
-1,
-1,
Ci.nsIFileOutputStream.DEFER_OPEN
);
await new Promise(resolve => {
lazy.logConsole.debug("Writing ", outputFilePath);
lazy.NetUtil.asyncCopy(inputStream, outputStream, () => {
lazy.logConsole.debug("Done writing ", outputFilePath);
outputStream.close();
resolve();
});
});
}
}
}
/**
* Given a URI to an HTML template for the single-file backup archive,
* produces the static markup that will then be used as the beginning of that
* single-file backup archive.
*
* @param {string} templateURI
* A URI pointing at a template for the HTML content for the page. This is
* what is visible if the file is loaded in a web browser.
* @param {boolean} isEncrypted
* True if the template should indicate that the backup is encrypted.
* @param {object} backupMetadata
* The metadata for the backup, which is also stored in the backup manifest
* of the compressed backup snapshot.
* @returns {Promise<string>}
*/
async renderTemplate(templateURI, isEncrypted, backupMetadata) {
const ARCHIVE_STYLES = "chrome://browser/content/backup/archive.css";
const ARCHIVE_SCRIPT = "chrome://browser/content/backup/archive.js";
const LOGO = "chrome://branding/content/icon128.png";
let templateResponse = await fetch(templateURI);
let templateString = await templateResponse.text();
let templateDOM = new DOMParser().parseFromString(
templateString,
"text/html"
);
// Set the lang attribute on the <html> element
templateDOM.documentElement.setAttribute(
"lang",
Services.locale.appLocaleAsBCP47
);
let downloadLink = templateDOM.querySelector("#download-moz-browser");
downloadLink.href = await this.resolveDownloadLink(
AppConstants.MOZ_UPDATE_CHANNEL
);
let supportLinkHref =
Services.urlFormatter.formatURLPref("app.support.baseURL") +
"recover-from-backup";
let supportLink = templateDOM.querySelector("#support-link");
supportLink.href = supportLinkHref;
// Now insert the logo as a dataURL, since we want the single-file backup
// archive to be entirely self-contained.
let logoResponse = await fetch(LOGO);
let logoBlob = await logoResponse.blob();
let logoDataURL = await new Promise((resolve, reject) => {
let reader = new FileReader();
reader.addEventListener("load", () => resolve(reader.result));
reader.addEventListener("error", reject);
reader.readAsDataURL(logoBlob);
});
let logoNode = templateDOM.querySelector("#logo");
logoNode.src = logoDataURL;
let encStateNode = templateDOM.querySelector("#encryption-state");
lazy.gDOMLocalization.setAttributes(
encStateNode,
isEncrypted
? "backup-file-encryption-state-encrypted"
: "backup-file-encryption-state-not-encrypted"
);
let lastBackedUpNode = templateDOM.querySelector("#last-backed-up");
lazy.gDOMLocalization.setArgs(lastBackedUpNode, {
// It's very unlikely that backupMetadata.date isn't a valid Date string,
// but if it _is_, then Fluent will cause us to crash in debug builds.
// We fallback to the current date if all else fails.
date: new Date(backupMetadata.date).getTime() || new Date().getTime(),
});
let creationDeviceNode = templateDOM.querySelector("#creation-device");
lazy.gDOMLocalization.setArgs(creationDeviceNode, {
machineName: backupMetadata.machineName,
});
try {
await lazy.gDOMLocalization.translateFragment(
templateDOM.documentElement
);
} catch (_) {
// This shouldn't happen, but we don't want a missing locale string to
// cause backup creation to fail.
}
// We have to insert styles and scripts after we serialize to XML, otherwise
// the XMLSerializer will escape things like descendent selectors in CSS
// with >.
let stylesResponse = await fetch(ARCHIVE_STYLES);
let scriptResponse = await fetch(ARCHIVE_SCRIPT);
// These days, we don't really support CSS preprocessor directives, so we
// can't ifdef out the MPL license header in styles before writing it into
// the archive file. Instead, we'll ensure that the license header is there,
// and then manually remove it here at runtime.
let stylesText = await stylesResponse.text();
const MPL_LICENSE = `/**
* 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
*/`;
if (!stylesText.includes(MPL_LICENSE)) {
throw new BackupError(
"Expected the MPL license block within archive.css",
ERRORS.UNKNOWN
);
}
stylesText = stylesText.replace(MPL_LICENSE, "");
let serializer = new XMLSerializer();
return serializer
.serializeToString(templateDOM)
.replace("{{styles}}", stylesText)
.replace("{{script}}", await scriptResponse.text());
}
/**
* Creates a portable, potentially encrypted single-file archive containing
* a compressed backup snapshot. The single-file archive is a specially
* crafted HTML file that embeds the compressed backup snapshot and
* backup metadata.
*
* @param {string} archivePath
* The path to write the single-file archive to.
* @param {string} templateURI
* A URI pointing at a template for the HTML content for the page. This is
* what is visible if the file is loaded in a web browser.
* @param {string} compressedBackupSnapshotPath
* The path on the file system where the compressed backup snapshot exists.
* @param {ArchiveEncryptionState|null} encState
* The ArchiveEncryptionState to encrypt the backup with, if encryption is
* enabled. If null is passed, the backup will not be encrypted.
* @param {object} backupMetadata
* The metadata for the backup, which is also stored in the backup manifest
* of the compressed backup snapshot.
* @param {object} options
* Options to pass to the worker, mainly for testing.
* @param {object} [options.chunkSize=ArchiveUtils.ARCHIVE_CHUNK_MAX_BYTES_SIZE]
* The chunk size to break the bytes into.
*/
async createArchive(
archivePath,
templateURI,
compressedBackupSnapshotPath,
encState,
backupMetadata,
options = {}
) {
let markup = await this.renderTemplate(
templateURI,
!!encState,
backupMetadata
);
let worker = new lazy.BasePromiseWorker(
"resource:///modules/backup/Archive.worker.mjs",
{ type: "module" }
);
worker.ExceptionHandlers[BackupError.name] = BackupError.fromMsg;
let chunkSize =
options.chunkSize || lazy.ArchiveUtils.ARCHIVE_CHUNK_MAX_BYTES_SIZE;
try {
let encryptionArgs = encState
? {
publicKey: encState.publicKey,
salt: encState.salt,
nonce: encState.nonce,
backupAuthKey: encState.backupAuthKey,
wrappedSecrets: encState.wrappedSecrets,
}
: null;
await worker
.post("constructArchive", [
{
archivePath,
markup,
backupMetadata,
compressedBackupSnapshotPath,
encryptionArgs,
chunkSize,
},
])
.catch(e => {
lazy.logConsole.error(e);
if (!(e instanceof BackupError)) {
throw new BackupError("Failed to create archive", ERRORS.UNKNOWN);
}
throw e;
});
} finally {
worker.terminate();
}
}
/**
* Constructs an nsIChannel that serves the bytes from an nsIInputStream -
* specifically, a nsIInputStream of bytes being streamed from a file.
*
* @see BackupService.#extractMetadataFromArchive()
* @param {nsIInputStream} inputStream
* The nsIInputStream to create the nsIChannel for.
* @param {string} contentType
* The content type for the nsIChannel. This is provided by
* BackupService.#extractMetadataFromArchive().
* @returns {nsIChannel}
*/
#createExtractionChannel(inputStream, contentType) {
let httpChan = lazy.NetUtil.newChannel({
uri,
loadUsingSystemPrincipal: true,
});
let channel = Cc["@mozilla.org/network/input-stream-channel;1"]
.createInstance(Ci.nsIInputStreamChannel)
.QueryInterface(Ci.nsIChannel);
channel.setURI(httpChan.URI);
channel.loadInfo = httpChan.loadInfo;
channel.contentStream = inputStream;
channel.contentType = contentType;
return channel;
}
/**
* A helper for BackupService.extractCompressedSnapshotFromArchive() that
* reads in the JSON block from the MIME message embedded within an
* archiveFile.
*
* @see BackupService.extractCompressedSnapshotFromArchive()
* @param {nsIFile} archiveFile
* The file to read the MIME message out from.
* @param {number} startByteOffset
* The start byte offset of the MIME message.
* @param {string} contentType
* The Content-Type of the MIME message.
* @returns {Promise<object>}
*/
async #extractJSONFromArchive(archiveFile, startByteOffset, contentType) {
let fileInputStream = Cc[
"@mozilla.org/network/file-input-stream;1"
].createInstance(Ci.nsIFileInputStream);
fileInputStream.init(
archiveFile,
-1,
-1,
Ci.nsIFileInputStream.CLOSE_ON_EOF
);
fileInputStream.seek(Ci.nsISeekableStream.NS_SEEK_SET, startByteOffset);
const EXPECTED_CONTENT_TYPE = "application/json";
let extractionChannel = this.#createExtractionChannel(
fileInputStream,
contentType
);
let textDecoder = new TextDecoder();
return new Promise((resolve, reject) => {
let streamConv = Cc["@mozilla.org/streamConverters;1"].getService(
Ci.nsIStreamConverterService
);
let multipartListenerForJSON = {
/**
* True once we've found an attachment matching our
* EXPECTED_CONTENT_TYPE. Once this is true, bytes flowing into
* onDataAvailable will be enqueued through the controller.
*
* @type {boolean}
*/
_enabled: false,
/**
* True once onStopRequest has been called once the listener is enabled.
* After this, the listener will not attempt to read any data passed
* to it through onDataAvailable.
*
* @type {boolean}
*/
_done: false,
/**
* A buffer with which we will cobble together the JSON string that
* will get parsed once the attachment finishes being read in.
*
* @type {string}
*/
_buffer: "",
QueryInterface: ChromeUtils.generateQI([
"nsIStreamListener",
"nsIRequestObserver",
"nsIMultiPartChannelListener",
]),
/**
* Called when we begin to load an attachment from the MIME message.
*
* @param {nsIRequest} request
* The request corresponding to the source of the data.
*/
onStartRequest(request) {
if (!(request instanceof Ci.nsIChannel)) {
throw Components.Exception(
"onStartRequest expected an nsIChannel request",
Cr.NS_ERROR_UNEXPECTED
);
}
this._enabled = request.contentType == EXPECTED_CONTENT_TYPE;
},
/**
* Called when data is flowing in for an attachment.
*
* @param {nsIRequest} request
* The request corresponding to the source of the data.
* @param {nsIInputStream} stream
* The input stream containing the data chunk.
* @param {number} offset
* The number of bytes that were sent in previous onDataAvailable
* calls for this request. In other words, the sum of all previous
* count parameters.
* @param {number} count
* The number of bytes available in the stream
*/
onDataAvailable(request, stream, offset, count) {
if (!this._enabled) {
// We don't care about this data, just move on.
return;
}
let binStream = new lazy.BinaryInputStream(stream);
let arrBuffer = new ArrayBuffer(count);
binStream.readArrayBuffer(count, arrBuffer);
let jsonBytes = new Uint8Array(arrBuffer);
this._buffer += textDecoder.decode(jsonBytes);
},
/**
* Called when the load of an attachment finishes.
*/
onStopRequest() {
if (this._enabled && !this._done) {
this._enabled = false;
this._done = true;
try {
let archiveMetadata = JSON.parse(this._buffer);
resolve(archiveMetadata);
} catch (e) {
reject(
new BackupError(
"Could not parse archive metadata.",
ERRORS.CORRUPTED_ARCHIVE
)
);
}
// No need to load anything else - abort reading in more
// attachments.
throw Components.Exception(
"Got JSON block. Aborting further reads.",
Cr.NS_BINDING_ABORTED
);
}
},
onAfterLastPart() {
if (!this._done) {
// We finished reading the parts before we found the JSON block, so
// the JSON block is missing.
reject(
new BackupError(
"Could not find JSON block.",
ERRORS.CORRUPTED_ARCHIVE
)
);
}
},
};
let conv = streamConv.asyncConvertData(
"multipart/mixed",
"*/*",
multipartListenerForJSON,
null
);
extractionChannel.asyncOpen(conv);
});
}
/**
* A helper for BackupService.#extractCompressedSnapshotFromArchive that
* constructs a BinaryReadableStream for a single-file archive on the
* file system. The BinaryReadableStream will be used to read out the binary
* attachment from the archive.
*
* @param {nsIFile} archiveFile
* The single-file archive to create the BinaryReadableStream for.
* @param {number} startByteOffset
* The start byte offset of the MIME message.
* @param {string} contentType
* The Content-Type of the MIME message.
* @returns {ReadableStream}
*/
async createBinaryReadableStream(archiveFile, startByteOffset, contentType) {
let fileInputStream = Cc[
"@mozilla.org/network/file-input-stream;1"
].createInstance(Ci.nsIFileInputStream);
fileInputStream.init(
archiveFile,
-1,
-1,
Ci.nsIFileInputStream.CLOSE_ON_EOF
);
fileInputStream.seek(Ci.nsISeekableStream.NS_SEEK_SET, startByteOffset);
let extractionChannel = this.#createExtractionChannel(
fileInputStream,
contentType
);
return new ReadableStream(new BinaryReadableStream(extractionChannel));
}
/**
* @typedef {object} SampleArchiveResult
* @property {boolean} isEncrypted
* True if the archive claims to be encrypted, and has the necessary data
* within the JSON block to attempt to initialize an ArchiveDecryptor.
* @property {number} startByteOffset
* The start byte offset of the MIME message.
* @property {string} contentType
* The Content-Type of the MIME message.
* @property {object} archiveJSON
* The deserialized JSON block from the archive. See the ArchiveJSONBlock
* schema for details of its structure.
*/
/**
* Reads from a file to determine if it seems to be a backup archive, and if
* so, resolves with some information about the archive without actually
* unpacking it. The returned Promise may reject if the file does not appear
* to be a backup archive, or the backup archive appears to have been
* corrupted somehow.
*
* @param {string} archivePath
* The path to the archive file to sample.
* @returns {Promise<SampleArchiveResult, Error>}
*/
async sampleArchive(archivePath) {
let worker = new lazy.BasePromiseWorker(
"resource:///modules/backup/Archive.worker.mjs",
{ type: "module" }
);
worker.ExceptionHandlers[BackupError.name] = BackupError.fromMsg;
if (!(await IOUtils.exists(archivePath))) {
throw new BackupError(
"Archive file does not exist at path " + archivePath,
ERRORS.UNKNOWN
);
}
try {
let { startByteOffset, contentType } = await worker
.post("parseArchiveHeader", [archivePath])
.catch(e => {
lazy.logConsole.error(e);
if (!(e instanceof BackupError)) {
throw new BackupError(
"Failed to parse archive header",
ERRORS.FILE_SYSTEM_ERROR
);
}
throw e;
});
let archiveFile = await IOUtils.getFile(archivePath);
let archiveJSON;
try {
archiveJSON = await this.#extractJSONFromArchive(
archiveFile,
startByteOffset,
contentType
);
if (!archiveJSON.version) {
throw new BackupError(
"Missing version in the archive JSON block.",
ERRORS.CORRUPTED_ARCHIVE
);
}
if (archiveJSON.version > lazy.ArchiveUtils.SCHEMA_VERSION) {
throw new BackupError(
`Archive JSON block is a version newer than we can interpret: ${archiveJSON.version}`,
ERRORS.UNSUPPORTED_BACKUP_VERSION
);
}
let archiveJSONSchema = await BackupService.getSchemaForVersion(
SCHEMAS.ARCHIVE_JSON_BLOCK,
archiveJSON.version
);
let manifestSchema = await BackupService.getSchemaForVersion(
SCHEMAS.BACKUP_MANIFEST,
archiveJSON.version
);
let validator = new lazy.JsonSchema.Validator(archiveJSONSchema);
validator.addSchema(manifestSchema);
let schemaValidationResult = validator.validate(archiveJSON);
if (!schemaValidationResult.valid) {
lazy.logConsole.error(
"Archive JSON block does not conform to schema:",
archiveJSON,
archiveJSONSchema,
schemaValidationResult
);
throw new BackupError(
`Archive JSON block does not conform to schema version ${archiveJSON.version}`,
ERRORS.CORRUPTED_ARCHIVE
);
}
} catch (e) {
lazy.logConsole.error(e);
throw e;
}
lazy.logConsole.debug("Read out archive JSON: ", archiveJSON);
return {
isEncrypted: !!archiveJSON.encConfig,
startByteOffset,
contentType,
archiveJSON,
};
} catch (e) {
lazy.logConsole.error(e);
throw e;
} finally {
worker.terminate();
}
}
/**
* Attempts to extract the compressed backup snapshot from a single-file
* archive, and write the extracted file to extractionDestPath. This may
* reject if the single-file archive appears malformed or cannot be
* properly decrypted. If the backup was encrypted, a native nsIOSKeyStore
* is also initialized with label BackupService.RECOVERY_OSKEYSTORE_LABEL
* with the secret used on the original backup machine. Callers are
* responsible for clearing this secret after any decryptions with it are
* completed.
*
* NOTE: Currently, this base64 decoding currently occurs on the main thread.
* We may end up moving all of this into the Archive Worker if we can modify
* IOUtils to allow writing via a stream.
*
* @param {string} archivePath
* The single-file archive that contains the backup.
* @param {string} extractionDestPath
* The path to write the extracted file to.
* @param {string} [recoveryCode=null]
* The recovery code to decrypt an encrypted backup with.
* @returns {Promise<undefined, Error>}
*/
async extractCompressedSnapshotFromArchive(
archivePath,
extractionDestPath,
recoveryCode = null
) {
let { isEncrypted, startByteOffset, contentType, archiveJSON } =
await this.sampleArchive(archivePath);
let decryptor = null;
if (isEncrypted) {
if (!recoveryCode) {
throw new BackupError(
"A recovery code is required to decrypt this archive.",
ERRORS.UNAUTHORIZED
);
}
decryptor = await lazy.ArchiveDecryptor.initialize(
recoveryCode,
archiveJSON
);
}
await IOUtils.remove(extractionDestPath, { ignoreAbsent: true });
let archiveFile = await IOUtils.getFile(archivePath);
let archiveStream = await this.createBinaryReadableStream(
archiveFile,
startByteOffset,
contentType
);
let binaryDecoder = new TransformStream(
new DecoderDecryptorTransformer(decryptor)
);
let fileWriter = new WritableStream(
new FileWriterStream(extractionDestPath, decryptor)
);
await archiveStream.pipeThrough(binaryDecoder).pipeTo(fileWriter);
if (decryptor) {
await lazy.nativeOSKeyStore.asyncRecoverSecret(
BackupService.RECOVERY_OSKEYSTORE_LABEL,
decryptor.OSKeyStoreSecret
);
}
}
/**
* Renames the staging folder to an ISO 8601 date string with dashes replacing colons and fractional seconds stripped off.
* The ISO date string should be formatted from YYYY-MM-DDTHH:mm:ss.sssZ to YYYY-MM-DDTHH-mm-ssZ
*
* @param {string} stagingPath
* The path to the populated staging folder.
* @returns {Promise<string|null>}
* The path to the renamed staging folder, or null if the stagingPath was
* not pointing to a valid folder.
*/
async #finalizeStagingFolder(stagingPath) {
if (!(await IOUtils.exists(stagingPath))) {
// If we somehow can't find the specified staging folder, cancel this step.
lazy.logConsole.error(
`Failed to finalize staging folder. Cannot find ${stagingPath}.`
);
return null;
}
try {
lazy.logConsole.debug("Finalizing and renaming staging folder");
let currentDateISO = new Date().toISOString();
// First strip the fractional seconds
let dateISOStripped = currentDateISO.replace(/\.\d+\Z$/, "Z");
// Now replace all colons with dashes
let dateISOFormatted = dateISOStripped.replaceAll(":", "-");
let stagingPathParent = PathUtils.parent(stagingPath);
let renamedBackupPath = PathUtils.join(
stagingPathParent,
dateISOFormatted
);
await IOUtils.move(stagingPath, renamedBackupPath);
let existingBackups = await IOUtils.getChildren(stagingPathParent);
/**
* If there are other pre-existing backup folders, delete them - but don't
* delete anything that doesn't match the backup folder naming scheme.
*/
let expectedFormatRegex = /\d{4}(-\d{2}){2}T(\d{2}-){2}\d{2}Z/;
for (let existingBackupPath of existingBackups) {
if (
existingBackupPath !== renamedBackupPath &&
existingBackupPath.match(expectedFormatRegex)
) {
await IOUtils.remove(existingBackupPath, {
recursive: true,
});
}
}
return renamedBackupPath;
} catch (e) {
lazy.logConsole.error(
`Something went wrong while finalizing the staging folder. ${e}`
);
throw new BackupError(
"Failed to finalize staging folder",
ERRORS.FILE_SYSTEM_ERROR
);
}
}
/**
* Creates and resolves with a backup manifest object with an empty resources
* property. See the BackupManifest schema for the specific shape of the
* returned manifest object.
*
* @returns {Promise<object>}
*/
async #createBackupManifest() {
let profileSvc = Cc["@mozilla.org/toolkit/profile-service;1"].getService(
Ci.nsIToolkitProfileService
);
let profileName;
if (!profileSvc.currentProfile) {
// We're probably running on a local build or in some special configuration.
// Let's pull in a profile name from the profile directory.
let profileFolder = PathUtils.split(PathUtils.profileDir).at(-1);
profileName = profileFolder.substring(profileFolder.indexOf(".") + 1);
} else {
profileName = profileSvc.currentProfile.name;
}
let meta = {
date: new Date().toISOString(),
appName: AppConstants.MOZ_APP_NAME,
appVersion: AppConstants.MOZ_APP_VERSION,
buildID: AppConstants.MOZ_BUILDID,
profileName,
machineName: lazy.fxAccounts.device.getLocalName(),
osName: Services.sysinfo.getProperty("name"),
osVersion: Services.sysinfo.getProperty("version"),
legacyClientID: await lazy.ClientID.getClientID(),
profileGroupID: await lazy.ClientID.getProfileGroupID(),
};
let fxaState = lazy.UIState.get();
if (fxaState.status == lazy.UIState.STATUS_SIGNED_IN) {
meta.accountID = fxaState.uid;
meta.accountEmail = fxaState.email;
}
return {
version: lazy.ArchiveUtils.SCHEMA_VERSION,
meta,
resources: {},
};
}
/**
* Given a backup archive at archivePath, this method does the
* following:
*
* 1. Potentially decrypts, and then extracts the compressed backup snapshot
* from the archive to a file named BackupService.RECOVERY_ZIP_FILE_NAME in
* the PROFILE_FOLDER_NAME folder.
* 2. Decompresses that file into a subdirectory of PROFILE_FOLDER_NAME named
* "recovery".
* 3. Deletes the BackupService.RECOVERY_ZIP_FILE_NAME file.
* 4. Calls into recoverFromSnapshotFolder on the decompressed "recovery"
* folder.
* 5. Optionally launches the newly created profile.
* 6. Returns the name of the newly created profile directory.
*
* @see BackupService.recoverFromSnapshotFolder
* @param {string} archivePath
* The path to the single-file backup archive on the file system.
* @param {string|null} recoveryCode
* The recovery code to use to attempt to decrypt the archive if it was
* encrypted.
* @param {boolean} [shouldLaunch=false]
* An optional argument that specifies whether an instance of the app
* should be launched with the newly recovered profile after recovery is
* complete.
* @param {boolean} [profilePath=PathUtils.profileDir]
* The profile path where the recovery files will be written to within the
* PROFILE_FOLDER_NAME. This is only used for testing.
* @param {string} [profileRootPath=null]
* An optional argument that specifies the root directory where the new
* profile directory should be created. If not provided, the default
* profile root directory will be used. This is primarily meant for
* testing.
* @returns {Promise<nsIToolkitProfile>}
* The nsIToolkitProfile that was created for the recovered profile.
* @throws {Exception}
* In the event that unpacking the archive, decompressing the snapshot, or
* recovery from the snapshot somehow failed.
*/
async recoverFromBackupArchive(
archivePath,
recoveryCode = null,
shouldLaunch = false,
profilePath = PathUtils.profileDir,
profileRootPath = null
) {
// No concurrent recoveries.
if (this.#recoveryInProgress) {
lazy.logConsole.warn("Recovery attempt already in progress");
return null;
}
try {
this.#recoveryInProgress = true;
const RECOVERY_FILE_DEST_PATH = PathUtils.join(
profilePath,
BackupService.PROFILE_FOLDER_NAME,
BackupService.RECOVERY_ZIP_FILE_NAME
);
await this.extractCompressedSnapshotFromArchive(
archivePath,
RECOVERY_FILE_DEST_PATH,
recoveryCode
);
let encState = null;
if (recoveryCode) {
// We were passed a recovery code and made it to this line. That implies
// that the backup was encrypted, and the recovery code was the correct
// one to decrypt it. We now generate a new ArchiveEncryptionState with
// that recovery code to write into the recovered profile.
({ instance: encState } = await lazy.ArchiveEncryptionState.initialize(
recoveryCode
));
}
const RECOVERY_FOLDER_DEST_PATH = PathUtils.join(
profilePath,
BackupService.PROFILE_FOLDER_NAME,
"recovery"
);
await this.decompressRecoveryFile(
RECOVERY_FILE_DEST_PATH,
RECOVERY_FOLDER_DEST_PATH
);
// Now that we've decompressed it, reclaim some disk space by getting rid of
// the ZIP file.
try {
await IOUtils.remove(RECOVERY_FILE_DEST_PATH);
} catch (_) {
lazy.logConsole.warn("Could not remove ", RECOVERY_FILE_DEST_PATH);
}
try {
// We're using a try/finally here to clean up the temporary OSKeyStore.
// We need to make sure that cleanup occurs _after_ the recovery has
// either fully succeeded, or fully failed. We await the return value
// of recoverFromSnapshotFolder so that the finally will not execute
// until after recoverFromSnapshotFolder has finished resolving or
// rejecting.
let newProfile = await this.recoverFromSnapshotFolder(
RECOVERY_FOLDER_DEST_PATH,
shouldLaunch,
profileRootPath,
encState
);
return newProfile;
} finally {
// If we had decrypted a backup, we would have created the temporary
// recovery OSKeyStore row with the label
// BackupService.RECOVERY_OSKEYSTORE_LABEL, which we will now delete,
// no matter if we succeeded or failed to recover.
//
// Note that according to nsIOSKeyStore, this is a no-op in the event that
// no secret exists at BackupService.RECOVERY_OSKEYSTORE_LABEL, so we're
// fine to do this even if we were recovering from an unencrypted
// backup.
if (recoveryCode) {
await lazy.nativeOSKeyStore.asyncDeleteSecret(
BackupService.RECOVERY_OSKEYSTORE_LABEL
);
}
}
} finally {
this.#recoveryInProgress = false;
}
}
/**
* Given a decompressed backup archive at recoveryPath, this method does the
* following:
*
* 1. Reads in the backup manifest from the archive and ensures that it is
* valid.
* 2. Creates a new named profile directory using the same name as the one
* found in the backup manifest, but with a different prefix.
* 3. Iterates over each resource in the manifest and calls the recover()
* method on each found BackupResource, passing in the associated
* ManifestEntry from the backup manifest, and collects any post-recovery
* data from those resources.
* 4. Writes a `post-recovery.json` file into the newly created profile
* directory.
* 5. Returns the name of the newly created profile directory.
* 6. Regardless of whether or not recovery succeeded, clears the native
* OSKeyStore of any secret labeled with
* BackupService.RECOVERY_OSKEYSTORE_LABEL.
*
* @param {string} recoveryPath
* The path to the decompressed backup archive on the file system.
* @param {boolean} [shouldLaunch=false]
* An optional argument that specifies whether an instance of the app
* should be launched with the newly recovered profile after recovery is
* complete.
* @param {string} [profileRootPath=null]
* An optional argument that specifies the root directory where the new
* profile directory should be created. If not provided, the default
* profile root directory will be used. This is primarily meant for
* testing.
* @param {ArchiveEncryptionState} [encState=null]
* Set if the backup being recovered was encrypted. This implies that the
* profile being recovered was configured to create encrypted backups. This
* ArchiveEncryptionState is therefore needed to generate the
* ARCHIVE_ENCRYPTION_STATE_FILE for the recovered profile (since the
* original ARCHIVE_ENCRYPTION_STATE_FILE was intentionally not backed up,
* as the recovery device might have a different OSKeyStore secret).
* @returns {Promise<nsIToolkitProfile>}
* The nsIToolkitProfile that was created for the recovered profile.
* @throws {Exception}
* In the event that recovery somehow failed.
*/
async recoverFromSnapshotFolder(
recoveryPath,
shouldLaunch = false,
profileRootPath = null,
encState = null
) {
lazy.logConsole.debug("Recovering from backup at ", recoveryPath);
try {
// Read in the backup manifest.
let manifestPath = PathUtils.join(
recoveryPath,
BackupService.MANIFEST_FILE_NAME
);
let manifest = await IOUtils.readJSON(manifestPath);
if (!manifest.version) {
throw new BackupError(
"Backup manifest version not found",
ERRORS.CORRUPTED_ARCHIVE
);
}
if (manifest.version > lazy.ArchiveUtils.SCHEMA_VERSION) {
throw new BackupError(
"Cannot recover from a manifest newer than the current schema version",
ERRORS.UNSUPPORTED_BACKUP_VERSION
);
}
// Make sure that it conforms to the schema.
let manifestSchema = await BackupService.getSchemaForVersion(
SCHEMAS.BACKUP_MANIFEST,
manifest.version
);
let schemaValidationResult = lazy.JsonSchema.validate(
manifest,
manifestSchema
);
if (!schemaValidationResult.valid) {
lazy.logConsole.error(
"Backup manifest does not conform to schema:",
manifest,
manifestSchema,
schemaValidationResult
);
throw new BackupError(
"Cannot recover from an invalid backup manifest",
ERRORS.CORRUPTED_ARCHIVE
);
}
// In the future, if we ever bump the ArchiveUtils.SCHEMA_VERSION and need
// to do any special behaviours to interpret older schemas, this is where
// we can do that, and we can remove this comment.
let meta = manifest.meta;
if (meta.appName != AppConstants.MOZ_APP_NAME) {
throw new BackupError(
`Cannot recover a backup from ${meta.appName} in ${AppConstants.MOZ_APP_NAME}`,
ERRORS.UNSUPPORTED_APPLICATION
);
}
if (
Services.vc.compare(AppConstants.MOZ_APP_VERSION, meta.appVersion) < 0
) {
throw new BackupError(
`Cannot recover a backup created on version ${meta.appVersion} in ${AppConstants.MOZ_APP_VERSION}`,
ERRORS.UNSUPPORTED_BACKUP_VERSION
);
}
// Okay, we have a valid backup-manifest.json. Let's create a new profile
// and start invoking the recover() method on each BackupResource.
let profileSvc = Cc["@mozilla.org/toolkit/profile-service;1"].getService(
Ci.nsIToolkitProfileService
);
let profile = profileSvc.createUniqueProfile(
profileRootPath ? await IOUtils.getDirectory(profileRootPath) : null,
meta.profileName
);
let postRecovery = {};
// Iterate over each resource in the manifest and call recover() on each
// associated BackupResource.
for (let resourceKey in manifest.resources) {
let manifestEntry = manifest.resources[resourceKey];
let resourceClass = this.#resources.get(resourceKey);
if (!resourceClass) {
lazy.logConsole.error(
`No BackupResource found for key ${resourceKey}`
);
continue;
}
try {
lazy.logConsole.debug(
`Restoring resource with key ${resourceKey}. ` +
`Requires encryption: ${resourceClass.requiresEncryption}`
);
let resourcePath = PathUtils.join(recoveryPath, resourceKey);
let postRecoveryEntry = await new resourceClass().recover(
manifestEntry,
resourcePath,
profile.rootDir.path
);
postRecovery[resourceKey] = postRecoveryEntry;
} catch (e) {
lazy.logConsole.error(
`Failed to recover resource: ${resourceKey}`,
e
);
}
}
// Make sure that a legacy telemetry client ID exists and is written to
// disk.
let clientID = await lazy.ClientID.getClientID();
lazy.logConsole.debug("Current client ID: ", clientID);
// Next, copy over the legacy telemetry client ID state from the currently
// running profile. The newly created profile that we're recovering into
// should inherit this client ID.
const TELEMETRY_STATE_FILENAME = "state.json";
const TELEMETRY_STATE_FOLDER = "datareporting";
await IOUtils.makeDirectory(
PathUtils.join(profile.rootDir.path, TELEMETRY_STATE_FOLDER)
);
await IOUtils.copy(
/* source */
PathUtils.join(
PathUtils.profileDir,
TELEMETRY_STATE_FOLDER,
TELEMETRY_STATE_FILENAME
),
/* destination */
PathUtils.join(
profile.rootDir.path,
TELEMETRY_STATE_FOLDER,
TELEMETRY_STATE_FILENAME
)
);
if (encState) {
// The backup we're recovering was originally encrypted, meaning that
// the recovered profile is configured to create encrypted backups. Our
// caller passed us a _new_ ArchiveEncryptionState generated for this
// device with the backup's recovery code so that we can serialize the
// ArchiveEncryptionState for the recovered profile.
let encStatePath = PathUtils.join(
profile.rootDir.path,
BackupService.PROFILE_FOLDER_NAME,
BackupService.ARCHIVE_ENCRYPTION_STATE_FILE
);
let encStateObject = await encState.serialize();
await IOUtils.writeJSON(encStatePath, encStateObject);
}
let postRecoveryPath = PathUtils.join(
profile.rootDir.path,
BackupService.POST_RECOVERY_FILE_NAME
);
await IOUtils.writeJSON(postRecoveryPath, postRecovery);
await profileSvc.asyncFlush();
if (shouldLaunch) {
Services.startup.createInstanceWithProfile(profile);
}
return profile;
} catch (e) {
lazy.logConsole.error(
"Failed to recover from backup at ",
recoveryPath,
e
);
throw e;
}
}
/**
* Checks for the POST_RECOVERY_FILE_NAME in the current profile directory.
* If one exists, instantiates any relevant BackupResource's, and calls
* postRecovery() on them with the appropriate entry from the file. Once
* this is done, deletes the file.
*
* The file is deleted even if one of the postRecovery() steps rejects or
* fails.
*
* This function resolves silently if the POST_RECOVERY_FILE_NAME file does
* not exist, which should be the majority of cases.
*
* @param {string} [profilePath=PathUtils.profileDir]
* The profile path to look for the POST_RECOVERY_FILE_NAME file. Defaults
* to the current profile.
* @returns {Promise<undefined>}
*/
async checkForPostRecovery(profilePath = PathUtils.profileDir) {
lazy.logConsole.debug(`Checking for post-recovery file in ${profilePath}`);
let postRecoveryFile = PathUtils.join(
profilePath,
BackupService.POST_RECOVERY_FILE_NAME
);
if (!(await IOUtils.exists(postRecoveryFile))) {
lazy.logConsole.debug("Did not find post-recovery file.");
this.#postRecoveryResolver();
return;
}
lazy.logConsole.debug("Found post-recovery file. Loading...");
try {
let postRecovery = await IOUtils.readJSON(postRecoveryFile);
for (let resourceKey in postRecovery) {
let postRecoveryEntry = postRecovery[resourceKey];
let resourceClass = this.#resources.get(resourceKey);
if (!resourceClass) {
lazy.logConsole.error(
`Invalid resource for post-recovery step: ${resourceKey}`
);
continue;
}
lazy.logConsole.debug(`Running post-recovery step for ${resourceKey}`);
await new resourceClass().postRecovery(postRecoveryEntry);
lazy.logConsole.debug(`Done post-recovery step for ${resourceKey}`);
}
} finally {
await IOUtils.remove(postRecoveryFile, { ignoreAbsent: true });
this.#postRecoveryResolver();
}
}
/**
* Sets the parent directory of the backups folder. Calling this function will update
* browser.backup.location.
*
* @param {string} parentDirPath directory path
*/
setParentDirPath(parentDirPath) {
try {
if (!parentDirPath || !PathUtils.filename(parentDirPath)) {
throw new BackupError(
"Parent directory path is invalid.",
ERRORS.FILE_SYSTEM_ERROR
);
}
// Recreate the backups path with the new parent directory.
let fullPath = PathUtils.join(
parentDirPath,
BackupService.BACKUP_DIR_NAME
);
Services.prefs.setStringPref(BACKUP_DIR_PREF_NAME, fullPath);
} catch (e) {
lazy.logConsole.error(
`Failed to set parent directory ${parentDirPath}. ${e}`
);
throw e;
}
}
/**
* Updates backupDirPath in the backup service state. Should be called every time the value
* for browser.backup.location changes.
*
* @param {string} newDirPath the new directory path for storing backups
*/
async onUpdateLocationDirPath(newDirPath) {
lazy.logConsole.debug(`Updating backup location to ${newDirPath}`);
Glean.browserBackup.changeLocation.record();
this.#_state.backupDirPath = newDirPath;
this.stateUpdate();
}
/**
* Returns the moz-icon URL of a file. To get the moz-icon URL, the
* file path is convered to a fileURI. If there is a problem retreiving
* the moz-icon due to an invalid file path, return null instead.
*
* @param {string} path Path of the file to read its icon from.
* @returns {string|null} The moz-icon URL of the specified file, or
* null if the icon cannot be retreived.
*/
getIconFromFilePath(path) {
if (!path) {
return null;
}
try {
let fileURI = PathUtils.toFileURI(path);
return `moz-icon:${fileURI}?size=16`;
} catch (e) {
return null;
}
}
/**
* Sets browser.backup.scheduled.enabled to true or false.
*
* @param { boolean } shouldEnableScheduledBackups true if scheduled backups should be enabled. Else, false.
*/
setScheduledBackups(shouldEnableScheduledBackups) {
Services.prefs.setBoolPref(
SCHEDULED_BACKUPS_ENABLED_PREF_NAME,
shouldEnableScheduledBackups
);
}
/**
* Updates scheduledBackupsEnabled in the backup service state. Should be called every time
* the value for browser.backup.scheduled.enabled changes.
*
* @param {boolean} isScheduledBackupsEnabled True if scheduled backups are enabled. Else false.
*/
onUpdateScheduledBackups(isScheduledBackupsEnabled) {
if (this.#_state.scheduledBackupsEnabled != isScheduledBackupsEnabled) {
if (isScheduledBackupsEnabled) {
Glean.browserBackup.toggleOn.record();
} else {
Glean.browserBackup.toggleOff.record();
}
lazy.logConsole.debug(
"Updating scheduled backups",
isScheduledBackupsEnabled
);
this.#_state.scheduledBackupsEnabled = isScheduledBackupsEnabled;
this.stateUpdate();
}
}
/**
* Take measurements of the current profile state for Telemetry.
*
* @returns {Promise<undefined>}
*/
async takeMeasurements() {
lazy.logConsole.debug("Taking Telemetry measurements");
// We'll start by taking some basic BackupService state measurements.
Glean.browserBackup.enabled.set(true);
Glean.browserBackup.schedulerEnabled.set(lazy.scheduledBackupsPref);
await this.loadEncryptionState();
Glean.browserBackup.pswdEncrypted.set(this.#_state.encryptionEnabled);
const USING_DEFAULT_DIR_PATH =
lazy.backupDirPref ==
PathUtils.join(lazy.defaultParentDirPath, BackupService.BACKUP_DIR_NAME);
Glean.browserBackup.locationOnDevice.set(USING_DEFAULT_DIR_PATH ? 1 : 2);
// Next, we'll measure the available disk space on the storage
// device that the profile directory is on.
let profileDir = await IOUtils.getFile(PathUtils.profileDir);
let profDDiskSpaceBytes = profileDir.diskSpaceAvailable;
// Make the measurement fuzzier by rounding to the nearest 10MB.
let profDDiskSpaceFuzzed = MeasurementUtils.fuzzByteSize(
profDDiskSpaceBytes,
10 * BYTES_IN_MEGABYTE
);
// And then record the value in kilobytes, since that's what everything
// else is going to be measured in.
Glean.browserBackup.profDDiskSpace.set(
profDDiskSpaceFuzzed / BYTES_IN_KILOBYTE
);
// Measure the size of each file we are going to backup.
for (let resourceClass of this.#resources.values()) {
try {
await new resourceClass().measure(PathUtils.profileDir);
} catch (e) {
lazy.logConsole.error(
`Failed to measure for resource: ${resourceClass.key}`,
e
);
}
}
}
/**
* The internal promise that is created on the first call to
* loadEncryptionState.
*
* @type {Promise}
*/
#loadEncryptionStatePromise = null;
/**
* Returns the current ArchiveEncryptionState. This method will only attempt
* to read the state from the disk the first time it is called.
*
* @param {string} [profilePath=PathUtils.profileDir]
* The profile path where the encryption state might exist. This is only
* used for testing.
* @returns {Promise<ArchiveEncryptionState>}
*/
loadEncryptionState(profilePath = PathUtils.profileDir) {
if (this.#encState !== undefined) {
return Promise.resolve(this.#encState);
}
// This little dance makes it so that we only attempt to read the state off
// of the disk the first time `loadEncryptionState` is called. Any
// subsequent calls will await this same promise, OR, after the state has
// been read in, they'll just get the #encState which is set after the
// state has been read in.
if (!this.#loadEncryptionStatePromise) {
this.#loadEncryptionStatePromise = (async () => {
// Default this to null here - that way, if we fail to read it in,
// the null will indicate that we have at least _tried_ to load the
// state.
let encState = null;
let encStateFile = PathUtils.join(
profilePath,
BackupService.PROFILE_FOLDER_NAME,
BackupService.ARCHIVE_ENCRYPTION_STATE_FILE
);
// Try to read in any pre-existing encryption state. If that fails,
// we fallback to not encrypting, and only backing up non-sensitive data.
try {
if (await IOUtils.exists(encStateFile)) {
let stateObject = await IOUtils.readJSON(encStateFile);
({ instance: encState } =
await lazy.ArchiveEncryptionState.initialize(stateObject));
}
} catch (e) {
lazy.logConsole.error(
"Failed to read / deserialize archive encryption state file: ",
e
);
// TODO: This kind of error might be worth collecting telemetry on.
}
this.#_state.encryptionEnabled = !!encState;
this.stateUpdate();
this.#encState = encState;
return encState;
})();
}
return this.#loadEncryptionStatePromise;
}
/**
* Enables encryption for backups, allowing sensitive data to be backed up.
* Throws if encryption is already enabled. After enabling encryption, that
* state is written to disk.
*
* @throws Exception
* @param {string} password
* A non-blank password ("recovery code") that can be used to derive keys
* for encrypting the backup.
* @param {string} [profilePath=PathUtils.profileDir]
* The profile path where the encryption state will be written. This is only
* used for testing.
*/
async enableEncryption(password, profilePath = PathUtils.profileDir) {
lazy.logConsole.debug("Enabling encryption.");
let encState = await this.loadEncryptionState(profilePath);
if (encState) {
throw new BackupError(
"Encryption is already enabled.",
ERRORS.ENCRYPTION_ALREADY_ENABLED
);
}
if (!password) {
throw new BackupError(
"Cannot supply a blank password.",
ERRORS.INVALID_PASSWORD
);
}
if (password.length < 8) {
throw new BackupError(
"Password must be at least 8 characters.",
ERRORS.INVALID_PASSWORD
);
}
// TODO: Enforce other password rules here, such as ensuring that the
// password is not considered common.
({ instance: encState } = await lazy.ArchiveEncryptionState.initialize(
password
));
if (!encState) {
throw new BackupError(
"Failed to construct ArchiveEncryptionState",
ERRORS.UNKNOWN
);
}
this.#encState = encState;
let encStateFile = PathUtils.join(
profilePath,
BackupService.PROFILE_FOLDER_NAME,
BackupService.ARCHIVE_ENCRYPTION_STATE_FILE
);
let stateObj = await encState.serialize();
await IOUtils.writeJSON(encStateFile, stateObj);
this.#_state.encryptionEnabled = true;
this.stateUpdate();
}
/**
* Disables encryption of backups. Throws is encryption is already disabled.
*
* @throws Exception
* @param {string} [profilePath=PathUtils.profileDir]
* The profile path where the encryption state exists. This is only used for
* testing.
* @returns {Promise<undefined>}
*/
async disableEncryption(profilePath = PathUtils.profileDir) {
lazy.logConsole.debug("Disabling encryption.");
let encState = await this.loadEncryptionState(profilePath);
if (!encState) {
throw new BackupError(
"Encryption is already disabled.",
ERRORS.ENCRYPTION_ALREADY_DISABLED
);
}
let encStateFile = PathUtils.join(
profilePath,
BackupService.PROFILE_FOLDER_NAME,
BackupService.ARCHIVE_ENCRYPTION_STATE_FILE
);
// It'd be pretty strange, but not impossible, for something else to have
// gotten rid of the encryption state file at this point. We'll ignore it
// if that's the case.
await IOUtils.remove(encStateFile, { ignoreAbsent: true });
this.#encState = null;
this.#_state.encryptionEnabled = false;
this.stateUpdate();
}
/**
* The value of IDLE_THRESHOLD_SECONDS_PREF_NAME at the time that
* initBackupScheduler was called. This is recorded so that if the preference
* changes at runtime, that we properly remove the idle observer in
* uninitBackupScheduler, since it's mapped to the idle time value.
*
* @see BackupService.initBackupScheduler()
* @see BackupService.uninitBackupScheduler()
* @type {number}
*/
#idleThresholdSeconds = null;
/**
* An ES6 class that extends EventTarget cannot, apparently, be coerced into
* a nsIObserver, even when we define QueryInterface. We work around this
* limitation by having the observer be a function that we define at
* registration time. We hold a reference to the observer so that we can
* properly unregister.
*
* @see BackupService.initBackupScheduler()
* @type {Function}
*/
#observer = null;
/**
* True if the backup scheduler system has been initted via
* initBackupScheduler().
*
* @see BackupService.initBackupScheduler()
* @type {boolean}
*/
#backupSchedulerInitted = false;
/**
* Initializes the backup scheduling system. This should be done shortly
* after startup. It is exposed as a public method mainly for ease in testing.
*
* The scheduler will automatically uninitialize itself on the
* quit-application-granted observer notification.
*
* @returns {Promise<undefined>}
*/
async initBackupScheduler() {
if (this.#backupSchedulerInitted) {
lazy.logConsole.warn(
"BackupService scheduler already initting or initted."
);
return;
}
this.#backupSchedulerInitted = true;
let lastBackupPrefValue = Services.prefs.getIntPref(
LAST_BACKUP_TIMESTAMP_PREF_NAME,
0
);
if (!lastBackupPrefValue) {
this.#_state.lastBackupDate = null;
} else {
this.#_state.lastBackupDate = lastBackupPrefValue;
}
this.#_state.lastBackupFileName = Services.prefs.getStringPref(
LAST_BACKUP_FILE_NAME_PREF_NAME,
""
);
this.stateUpdate();
// We'll default to 5 minutes of idle time unless otherwise configured.
const FIVE_MINUTES_IN_SECONDS = 5 * 60;
this.#idleThresholdSeconds = Services.prefs.getIntPref(
IDLE_THRESHOLD_SECONDS_PREF_NAME,
FIVE_MINUTES_IN_SECONDS
);
this.#observer = (subject, topic, data) => {
this.onObserve(subject, topic, data);
};
lazy.logConsole.debug(
`Registering idle observer for ${
this.#idleThresholdSeconds
} seconds of idle time`
);
lazy.idleService.addIdleObserver(
this.#observer,
this.#idleThresholdSeconds
);
lazy.logConsole.debug("Idle observer registered.");
lazy.logConsole.debug(`Registering Places observer`);
this.#placesObserver = new PlacesWeakCallbackWrapper(
this.onPlacesEvents.bind(this)
);
PlacesObservers.addListener(
["history-cleared", "page-removed", "bookmark-removed"],
this.#placesObserver
);
lazy.AddonManager.addAddonListener(this);
Services.obs.addObserver(this.#observer, "passwordmgr-storage-changed");
Services.obs.addObserver(this.#observer, "formautofill-storage-changed");
Services.obs.addObserver(this.#observer, "sanitizer-sanitization-complete");
Services.obs.addObserver(this.#observer, "perm-changed");
Services.obs.addObserver(this.#observer, "cookie-changed");
Services.obs.addObserver(this.#observer, "session-cookie-changed");
Services.obs.addObserver(this.#observer, "newtab-linkBlocked");
Services.obs.addObserver(this.#observer, "quit-application-granted");
}
/**
* Uninitializes the backup scheduling system.
*
* @returns {Promise<undefined>}
*/
async uninitBackupScheduler() {
if (!this.#backupSchedulerInitted) {
lazy.logConsole.warn(
"Tried to uninitBackupScheduler when it wasn't yet enabled."
);
return;
}
lazy.idleService.removeIdleObserver(
this.#observer,
this.#idleThresholdSeconds
);
PlacesObservers.removeListener(
["history-cleared", "page-removed", "bookmark-removed"],
this.#placesObserver
);
lazy.AddonManager.removeAddonListener(this);
Services.obs.removeObserver(this.#observer, "passwordmgr-storage-changed");
Services.obs.removeObserver(this.#observer, "formautofill-storage-changed");
Services.obs.removeObserver(
this.#observer,
"sanitizer-sanitization-complete"
);
Services.obs.removeObserver(this.#observer, "perm-changed");
Services.obs.removeObserver(this.#observer, "cookie-changed");
Services.obs.removeObserver(this.#observer, "session-cookie-changed");
Services.obs.removeObserver(this.#observer, "newtab-linkBlocked");
Services.obs.removeObserver(this.#observer, "quit-application-granted");
this.#observer = null;
this.#regenerationDebouncer.disarm();
this.#backupWriteAbortController.abort();
}
/**
* Called by this.#observer on idle from the nsIUserIdleService or
* quit-application-granted from the nsIObserverService. Exposed as a public
* method mainly for ease in testing.
*
* @param {nsISupports|null} subject
* The nsIUserIdleService for the idle notification, and null for the
* quit-application-granted topic.
* @param {string} topic
* The topic that the notification belongs to.
* @param {string} data
* Optional data that was included with the notification.
*/
onObserve(subject, topic, data) {
switch (topic) {
case "idle": {
this.onIdle();
break;
}
case "quit-application-granted": {
this.uninitBackupScheduler();
break;
}
case "passwordmgr-storage-changed": {
if (data == "removeLogin" || data == "removeAllLogins") {
this.#debounceRegeneration();
}
break;
}
case "formautofill-storage-changed": {
if (
data == "remove" &&
(subject.wrappedJSObject.collectionName == "creditCards" ||
subject.wrappedJSObject.collectionName == "addresses")
) {
this.#debounceRegeneration();
}
break;
}
case "newtab-linkBlocked":
// Intentional fall-through
case "sanitizer-sanitization-complete": {
this.#debounceRegeneration();
break;
}
case "perm-changed": {
if (data == "deleted") {
this.#debounceRegeneration();
}
break;
}
case "cookie-changed":
// Intentional fall-through
case "session-cookie-changed": {
let notification = subject.QueryInterface(Ci.nsICookieNotification);
// A browsingContextId value of 0 means that this deletion was caused by
// chrome UI cookie deletion, which is what we care about. If it's not
// 0, then a site deleted its own cookie, which we ignore.
if (
(notification.action == Ci.nsICookieNotification.COOKIE_DELETED ||
notification.action ==
Ci.nsICookieNotification.ALL_COOKIES_CLEARED) &&
!notification.browsingContextId
) {
this.#debounceRegeneration();
}
break;
}
}
}
/**
* Called when the last known backup should be deleted and a new one
* created. This uses the #regenerationDebouncer to debounce clusters of
* events that might cause such a regeneration to occur.
*/
#debounceRegeneration() {
this.#regenerationDebouncer.disarm();
this.#regenerationDebouncer.arm();
}
/**
* Called when the nsIUserIdleService reports that user input events have
* not been sent to the application for at least
* IDLE_THRESHOLD_SECONDS_PREF_NAME seconds.
*/
onIdle() {
lazy.logConsole.debug("Saw idle callback");
if (!this.#takenMeasurements) {
this.takeMeasurements();
this.#takenMeasurements = true;
}
if (lazy.scheduledBackupsPref) {
lazy.logConsole.debug("Scheduled backups enabled.");
let now = Math.floor(Date.now() / 1000);
let lastBackupDate = this.#_state.lastBackupDate;
if (lastBackupDate && lastBackupDate > now) {
lazy.logConsole.error(
"Last backup was somehow in the future. Resetting the preference."
);
lastBackupDate = null;
this.#_state.lastBackupDate = null;
this.stateUpdate();
}
if (!lastBackupDate) {
lazy.logConsole.debug("No last backup time recorded in prefs.");
} else {
lazy.logConsole.debug(
"Last backup was: ",
new Date(lastBackupDate * 1000)
);
}
if (
!lastBackupDate ||
now - lastBackupDate > lazy.minimumTimeBetweenBackupsSeconds
) {
lazy.logConsole.debug(
"Last backup exceeded minimum time between backups. Queing a " +
"backup via idleDispatch."
);
// Just because the user hasn't sent us events in a while doesn't mean
// that the browser itself isn't busy. It might be, for example, playing
// video or doing a complex calculation that the user is actively
// waiting to complete, and we don't want to draw resources from that.
// Instead, we'll use ChromeUtils.idleDispatch to wait until the event
// loop in the parent process isn't so busy with higher priority things.
this.createBackupOnIdleDispatch();
} else {
lazy.logConsole.debug(
"Last backup was too recent. Not creating one for now."
);
}
}
}
/**
* Calls BackupService.createBackup at the next moment when the event queue
* is not busy with higher priority events. This is intentionally broken out
* into its own method to make it easier to stub out in tests.
*/
createBackupOnIdleDispatch() {
ChromeUtils.idleDispatch(() => {
lazy.logConsole.debug(
"idleDispatch fired. Attempting to create a backup."
);
this.createBackup();
});
}
/**
* Handler for events coming in through our PlacesObserver.
*
* @param {PlacesEvent[]} placesEvents
* One or more batched events that are of a type that we subscribed to.
*/
onPlacesEvents(placesEvents) {
// Note that if any of the events that we iterate result in a regeneration
// being queued, we simply return without the processing the rest, as there
// is not really a point.
for (let event of placesEvents) {
switch (event.type) {
case "page-removed": {
// We will get a page-removed event if a page has been deleted both
// manually by a user, but also automatically if the page has "aged
// out" of the Places database. We only want to regenerate backups
// in the manual case (REASON_DELETED).
if (event.reason == PlacesVisitRemoved.REASON_DELETED) {
this.#debounceRegeneration();
return;
}
break;
}
case "bookmark-removed":
// Intentional fall-through
case "history-cleared": {
this.#debounceRegeneration();
return;
}
}
}
}
/**
* This method is the only method of the AddonListener interface that
* BackupService implements and is called by AddonManager when an addon
* is uninstalled.
*
* @param {AddonInternal} _addon
* The addon being uninstalled.
*/
onUninstalled(_addon) {
this.#debounceRegeneration();
}
/**
* Gets a sample from a given backup file and sets a subset of that as
* the backupFileInfo in the backup service state.
*
* Called when getting a info for an archive to potentially restore.
*
* @param {string} backupFilePath path to the backup file to sample.
*/
async getBackupFileInfo(backupFilePath) {
lazy.logConsole.debug(`Getting info from backup file at ${backupFilePath}`);
let { archiveJSON, isEncrypted } = await this.sampleArchive(backupFilePath);
this.#_state.backupFileInfo = {
isEncrypted,
date: archiveJSON?.meta?.date,
};
this.stateUpdate();
}
/*
* Attempts to open a native file explorer window at the last backup file's
* location on the filesystem.
*/
async showBackupLocation() {
let backupFilePath = PathUtils.join(
lazy.backupDirPref,
this.#_state.lastBackupFileName
);
if (await IOUtils.exists(backupFilePath)) {
new lazy.nsLocalFile(backupFilePath).reveal();
} else {
let archiveDestFolderPath = await this.resolveArchiveDestFolderPath(
lazy.backupDirPref
);
new lazy.nsLocalFile(archiveDestFolderPath).reveal();
}
}
/**
* Shows a native folder picker to set the location to write the single-file
* archive files.
*
* @param {ChromeWindow} window
* The top-level browsing window to associate the file picker with.
* @returns {Promise<undefined>}
*/
async editBackupLocation(window) {
let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
let mode = Ci.nsIFilePicker.modeGetFolder;
fp.init(window.browsingContext, "", mode);
let currentBackupDirPathParent = PathUtils.parent(
this.#_state.backupDirPath
);
if (await IOUtils.exists(currentBackupDirPathParent)) {
fp.displayDirectory = await IOUtils.getDirectory(
currentBackupDirPathParent
);
}
let result = await new Promise(resolve => fp.open(resolve));
if (result === Ci.nsIFilePicker.returnCancel) {
return;
}
let path = fp.file.path;
// If the same parent directory was chosen, this is a no-op.
if (
PathUtils.join(path, BackupService.BACKUP_DIR_NAME) == lazy.backupDirPref
) {
return;
}
// If the location changed, delete the last backup there if one exists.
await this.deleteLastBackup();
this.setParentDirPath(path);
}
/**
* Will attempt to delete the last created single-file archive if it exists.
* Once done, this method will also check the parent folder to see if it's
* empty. If so, then the folder is removed.
*
* @returns {Promise<undefined>}
*/
async deleteLastBackup() {
if (!lazy.scheduledBackupsPref) {
lazy.logConsole.debug(
"Not deleting last backup, as scheduled backups are disabled."
);
return undefined;
}
return locks.request(
BackupService.WRITE_BACKUP_LOCK_NAME,
{ signal: this.#backupWriteAbortController.signal },
async () => {
if (this.#_state.lastBackupFileName) {
if (await this.#infalliblePathExists(lazy.backupDirPref)) {
let backupFilePath = PathUtils.join(
lazy.backupDirPref,
this.#_state.lastBackupFileName
);
lazy.logConsole.log(
"Attempting to delete last backup file at ",
backupFilePath
);
await IOUtils.remove(backupFilePath, { ignoreAbsent: true });
}
this.#_state.lastBackupDate = null;
Services.prefs.clearUserPref(LAST_BACKUP_TIMESTAMP_PREF_NAME);
this.#_state.lastBackupFileName = "";
Services.prefs.clearUserPref(LAST_BACKUP_FILE_NAME_PREF_NAME);
this.stateUpdate();
} else {
lazy.logConsole.log(
"Not deleting last backup file, since none is known about."
);
}
if (await this.#infalliblePathExists(lazy.backupDirPref)) {
// See if there are any other files lingering around in the destination
// folder. If not, delete that folder too.
let children = await IOUtils.getChildren(lazy.backupDirPref);
if (!children.length) {
await IOUtils.remove(lazy.backupDirPref);
}
}
}
);
}
/**
* Wraps an IOUtils.exists in a try/catch and returns true iff the passed
* path actually exists on the file system. Returns false if the path doesn't
* exist or is an invalid path.
*
* @param {string} path
* The path to check for existence.
* @returns {Promise<boolean>}
*/
async #infalliblePathExists(path) {
let exists = false;
try {
exists = await IOUtils.exists(path);
} catch (e) {
lazy.logConsole.warn("Path failed existence check :", path);
return false;
}
return exists;
}
}