diff options
Diffstat (limited to '')
| -rw-r--r-- | toolkit/components/places/PlacesBackups.sys.mjs | 523 |
1 files changed, 523 insertions, 0 deletions
diff --git a/toolkit/components/places/PlacesBackups.sys.mjs b/toolkit/components/places/PlacesBackups.sys.mjs new file mode 100644 index 0000000000..54d1110f8a --- /dev/null +++ b/toolkit/components/places/PlacesBackups.sys.mjs @@ -0,0 +1,523 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- + * vim: sw=2 ts=2 sts=2 expandtab filetype=javascript + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"; + +const lazy = {}; + +ChromeUtils.defineESModuleGetters(lazy, { + PlacesUtils: "resource://gre/modules/PlacesUtils.sys.mjs", + BookmarkJSONUtils: "resource://gre/modules/BookmarkJSONUtils.sys.mjs", +}); + +XPCOMUtils.defineLazyGetter( + lazy, + "filenamesRegex", + () => + /^bookmarks-([0-9-]+)(?:_([0-9]+)){0,1}(?:_([a-z0-9=+-]{24})){0,1}\.(json(lz4)?)$/i +); + +async function limitBackups(aMaxBackups, backupFiles) { + if ( + typeof aMaxBackups == "number" && + aMaxBackups > -1 && + backupFiles.length >= aMaxBackups + ) { + let numberOfBackupsToDelete = backupFiles.length - aMaxBackups; + while (numberOfBackupsToDelete--) { + let oldestBackup = backupFiles.pop(); + await IOUtils.remove(oldestBackup); + } + } +} + +/** + * Appends meta-data information to a given filename. + */ +function appendMetaDataToFilename(aFilename, aMetaData) { + let matches = aFilename.match(lazy.filenamesRegex); + return ( + "bookmarks-" + + matches[1] + + "_" + + aMetaData.count + + "_" + + aMetaData.hash + + "." + + matches[4] + ); +} + +/** + * Gets the hash from a backup filename. + * + * @return the extracted hash or null. + */ +function getHashFromFilename(aFilename) { + let matches = aFilename.match(lazy.filenamesRegex); + if (matches && matches[3]) { + return matches[3]; + } + return null; +} + +/** + * Given two filenames, checks if they contain the same date. + */ +function isFilenameWithSameDate(aSourceName, aTargetName) { + let sourceMatches = aSourceName.match(lazy.filenamesRegex); + let targetMatches = aTargetName.match(lazy.filenamesRegex); + + return sourceMatches && targetMatches && sourceMatches[1] == targetMatches[1]; +} + +/** + * Given a filename, searches for another backup with the same date. + * + * @return path string or null. + */ +function getBackupFileForSameDate(aFilename) { + return (async function() { + let backupFiles = await PlacesBackups.getBackupFiles(); + for (let backupFile of backupFiles) { + if (isFilenameWithSameDate(PathUtils.filename(backupFile), aFilename)) { + return backupFile; + } + } + return null; + })(); +} + +export var PlacesBackups = { + /** + * Matches the backup filename: + * 0: file name + * 1: date in form Y-m-d + * 2: bookmarks count + * 3: contents hash + * 4: file extension + */ + get filenamesRegex() { + return lazy.filenamesRegex; + }, + + /** + * Gets backup folder asynchronously. + * @return {Promise} + * @resolve the folder (the folder string path). + */ + getBackupFolder: function PB_getBackupFolder() { + return (async () => { + if (this._backupFolder) { + return this._backupFolder; + } + let backupsDirPath = PathUtils.join( + PathUtils.profileDir, + this.profileRelativeFolderPath + ); + await IOUtils.makeDirectory(backupsDirPath); + return (this._backupFolder = backupsDirPath); + })(); + }, + + get profileRelativeFolderPath() { + return "bookmarkbackups"; + }, + + /** + * Cache current backups in a sorted (by date DESC) array. + * @return {Promise} + * @resolve a sorted array of string paths. + */ + getBackupFiles: function PB_getBackupFiles() { + return (async () => { + if (this._backupFiles) { + return this._backupFiles; + } + + this._backupFiles = []; + + let backupFolderPath = await this.getBackupFolder(); + let children = await IOUtils.getChildren(backupFolderPath); + let list = []; + for (const entry of children) { + // Since IOUtils I/O is serialized, we can safely remove .tmp files + // without risking to remove ongoing backups. + let filename = PathUtils.filename(entry); + if (filename.endsWith(".tmp")) { + list.push(IOUtils.remove(entry)); + continue; + } + + if (lazy.filenamesRegex.test(filename)) { + // Remove bogus backups in future dates. + if (this.getDateForFile(entry) > new Date()) { + list.push(IOUtils.remove(entry)); + continue; + } + this._backupFiles.push(entry); + } + } + await Promise.all(list); + + this._backupFiles.sort((a, b) => { + let aDate = this.getDateForFile(a); + let bDate = this.getDateForFile(b); + return bDate - aDate; + }); + + return this._backupFiles; + })(); + }, + + /** + * Invalidates the internal cache for testing purposes. + */ + invalidateCache() { + this._backupFiles = null; + }, + + /** + * Generates a ISO date string (YYYY-MM-DD) from a Date object. + * + * @param dateObj + * The date object to parse. + * @return an ISO date string. + */ + toISODateString: function toISODateString(dateObj) { + if (!dateObj || dateObj.constructor.name != "Date" || !dateObj.getTime()) { + throw new Error("invalid date object"); + } + let padDate = val => ("0" + val).substr(-2, 2); + return [ + dateObj.getFullYear(), + padDate(dateObj.getMonth() + 1), + padDate(dateObj.getDate()), + ].join("-"); + }, + + /** + * Creates a filename for bookmarks backup files. + * + * @param [optional] aDateObj + * Date object used to build the filename. + * Will use current date if empty. + * @param [optional] bool - aCompress + * Determines if file extension is json or jsonlz4 + Default is json + * @return A bookmarks backup filename. + */ + getFilenameForDate: function PB_getFilenameForDate(aDateObj, aCompress) { + let dateObj = aDateObj || new Date(); + // Use YYYY-MM-DD (ISO 8601) as it doesn't contain illegal characters + // and makes the alphabetical order of multiple backup files more useful. + return ( + "bookmarks-" + + PlacesBackups.toISODateString(dateObj) + + ".json" + + (aCompress ? "lz4" : "") + ); + }, + + /** + * Creates a Date object from a backup file. The date is the backup + * creation date. + * + * @param {Sring} aBackupFile The path of the backup. + * @return {Date} A Date object for the backup's creation time. + */ + getDateForFile: function PB_getDateForFile(aBackupFile) { + let filename = PathUtils.filename(aBackupFile); + let matches = filename.match(lazy.filenamesRegex); + if (!matches) { + throw new Error(`Invalid backup file name: ${filename}`); + } + return new Date(matches[1].replace(/-/g, "/")); + }, + + /** + * Get the most recent backup file. + * + * @return {Promise} + * @result the path to the file. + */ + getMostRecentBackup: function PB_getMostRecentBackup() { + return (async () => { + let entries = await this.getBackupFiles(); + for (let entry of entries) { + let rx = /\.json(lz4)?$/; + if (PathUtils.filename(entry).match(rx)) { + return entry; + } + } + return null; + })(); + }, + + /** + * Returns whether a recent enough backup exists, using these heuristic: if + * a backup exists, it should be newer than the last browser session date, + * otherwise it should not be older than maxDays. + * If the backup is older than the last session, the calculated time is + * reported to telemetry. + * + * @param [maxDays] The maximum number of days a backup can be old. + */ + async hasRecentBackup({ maxDays = 3 } = {}) { + let lastBackupFile = await PlacesBackups.getMostRecentBackup(); + if (!lastBackupFile) { + return false; + } + let lastBackupTime = PlacesBackups.getDateForFile(lastBackupFile); + let profileLastUse = Services.appinfo.replacedLockTime || Date.now(); + if (lastBackupTime > profileLastUse) { + return true; + } + let backupAge = Math.round((profileLastUse - lastBackupTime) / 86400000); + // Telemetry the age of the last available backup. + try { + Services.telemetry + .getHistogramById("PLACES_BACKUPS_DAYSFROMLAST") + .add(backupAge); + } catch (ex) { + console.error(new Error("Unable to report telemetry.")); + } + return backupAge <= maxDays; + }, + + /** + * Serializes bookmarks using JSON, and writes to the supplied file. + * + * @param aFilePath + * path for the "bookmarks.json" file to be created. + * @return {Promise} + * @resolves the number of serialized uri nodes. + */ + async saveBookmarksToJSONFile(aFilePath) { + let { + count: nodeCount, + hash: hash, + } = await lazy.BookmarkJSONUtils.exportToFile(aFilePath); + + let backupFolderPath = await this.getBackupFolder(); + if (PathUtils.profileDir == backupFolderPath) { + // We are creating a backup in the default backups folder, + // so just update the internal cache. + if (!this._backupFiles) { + await this.getBackupFiles(); + } + this._backupFiles.unshift(aFilePath); + } else { + let aMaxBackup = Services.prefs.getIntPref( + "browser.bookmarks.max_backups" + ); + if (aMaxBackup === 0) { + if (!this._backupFiles) { + await this.getBackupFiles(); + } + limitBackups(aMaxBackup, this._backupFiles); + return nodeCount; + } + // If we are saving to a folder different than our backups folder, then + // we also want to create a new compressed version in it. + // This way we ensure the latest valid backup is the same saved by the + // user. See bug 424389. + let mostRecentBackupFile = await this.getMostRecentBackup(); + if ( + !mostRecentBackupFile || + hash != getHashFromFilename(PathUtils.filename(mostRecentBackupFile)) + ) { + let name = this.getFilenameForDate(undefined, true); + let newFilename = appendMetaDataToFilename(name, { + count: nodeCount, + hash, + }); + let newFilePath = PathUtils.join(backupFolderPath, newFilename); + let backupFile = await getBackupFileForSameDate(name); + if (backupFile) { + // There is already a backup for today, replace it. + await IOUtils.remove(backupFile); + if (!this._backupFiles) { + await this.getBackupFiles(); + } else { + this._backupFiles.shift(); + } + this._backupFiles.unshift(newFilePath); + } else { + // There is no backup for today, add the new one. + if (!this._backupFiles) { + await this.getBackupFiles(); + } + this._backupFiles.unshift(newFilePath); + } + let jsonString = await IOUtils.read(aFilePath); + await IOUtils.write(newFilePath, jsonString, { + compress: true, + }); + await limitBackups(aMaxBackup, this._backupFiles); + } + } + return nodeCount; + }, + + /** + * Creates a dated backup in <profile>/bookmarkbackups. + * Stores the bookmarks using a lz4 compressed JSON file. + * + * @param [optional] int aMaxBackups + * The maximum number of backups to keep. If set to 0 + * all existing backups are removed and aForceBackup is + * ignored, so a new one won't be created. + * @param [optional] bool aForceBackup + * Forces creating a backup even if one was already + * created that day (overwrites). + * @return {Promise} + */ + create: function PB_create(aMaxBackups, aForceBackup) { + return (async () => { + if (aMaxBackups === 0) { + // Backups are disabled, delete any existing one and bail out. + if (!this._backupFiles) { + await this.getBackupFiles(); + } + await limitBackups(0, this._backupFiles); + return; + } + + // Ensure to initialize _backupFiles + if (!this._backupFiles) { + await this.getBackupFiles(); + } + let newBackupFilename = this.getFilenameForDate(undefined, true); + // If we already have a backup for today we should do nothing, unless we + // were required to enforce a new backup. + let backupFile = await getBackupFileForSameDate(newBackupFilename); + if (backupFile && !aForceBackup) { + return; + } + + if (backupFile) { + // In case there is a backup for today we should recreate it. + this._backupFiles.shift(); + await IOUtils.remove(backupFile); + } + + // Now check the hash of the most recent backup, and try to create a new + // backup, if that fails due to hash conflict, just rename the old backup. + let mostRecentBackupFile = await this.getMostRecentBackup(); + let mostRecentHash = + mostRecentBackupFile && + getHashFromFilename(PathUtils.filename(mostRecentBackupFile)); + + // Save bookmarks to a backup file. + let backupFolder = await this.getBackupFolder(); + let newBackupFile = PathUtils.join(backupFolder, newBackupFilename); + let newFilenameWithMetaData; + try { + let { + count: nodeCount, + hash: hash, + } = await lazy.BookmarkJSONUtils.exportToFile(newBackupFile, { + compress: true, + failIfHashIs: mostRecentHash, + }); + newFilenameWithMetaData = appendMetaDataToFilename(newBackupFilename, { + count: nodeCount, + hash, + }); + } catch (ex) { + if (!ex.becauseSameHash) { + throw ex; + } + // The last backup already contained up-to-date information, just + // rename it as if it was today's backup. + this._backupFiles.shift(); + newBackupFile = mostRecentBackupFile; + // Ensure we retain the proper extension when renaming + // the most recent backup file. + if (/\.json$/.test(PathUtils.filename(mostRecentBackupFile))) { + newBackupFilename = this.getFilenameForDate(); + } + newFilenameWithMetaData = appendMetaDataToFilename(newBackupFilename, { + count: this.getBookmarkCountForFile(mostRecentBackupFile), + hash: mostRecentHash, + }); + } + + // Append metadata to the backup filename. + let newBackupFileWithMetadata = PathUtils.join( + backupFolder, + newFilenameWithMetaData + ); + await IOUtils.move(newBackupFile, newBackupFileWithMetadata); + this._backupFiles.unshift(newBackupFileWithMetadata); + + // Limit the number of backups. + await limitBackups(aMaxBackups, this._backupFiles); + })(); + }, + + /** + * Gets the bookmark count for backup file. + * + * @param aFilePath + * File path The backup file. + * + * @return the bookmark count or null. + */ + getBookmarkCountForFile: function PB_getBookmarkCountForFile(aFilePath) { + let count = null; + let filename = PathUtils.filename(aFilePath); + let matches = filename.match(lazy.filenamesRegex); + if (matches && matches[2]) { + count = matches[2]; + } + return count; + }, + + /** + * Gets a bookmarks tree representation usable to create backups in different + * file formats. The root or the tree is PlacesUtils.bookmarks.rootGuid. + * + * @return an object representing a tree with the places root as its root. + * Each bookmark is represented by an object having these properties: + * * id: the item id (make this not enumerable after bug 824502) + * * title: the title + * * guid: unique id + * * parent: item id of the parent folder, not enumerable + * * index: the position in the parent + * * dateAdded: microseconds from the epoch + * * lastModified: microseconds from the epoch + * * type: type of the originating node as defined in PlacesUtils + * The following properties exist only for a subset of bookmarks: + * * annos: array of annotations + * * uri: url + * * iconUri: favicon's url + * * keyword: associated keyword + * * charset: last known charset + * * tags: csv string of tags + * * root: string describing whether this represents a root + * * children: array of child items in a folder + */ + async getBookmarksTree() { + let startTime = Date.now(); + let root = await lazy.PlacesUtils.promiseBookmarksTree( + lazy.PlacesUtils.bookmarks.rootGuid, + { + includeItemIds: true, + } + ); + + try { + Services.telemetry + .getHistogramById("PLACES_BACKUPS_BOOKMARKSTREE_MS") + .add(Date.now() - startTime); + } catch (ex) { + console.error("Unable to report telemetry."); + } + return [root, root.itemsCount]; + }, +}; |