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browser_migrator.js
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browser_migrator.js
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'use strict';
/* global BookmarksDatabase */
/* global Places */
// https://developer.mozilla.org/en-US/docs/Web/API/IDBDatabaseException
// IDBDatabaseException obselete
/** Support different browser versions of IndexedDB */
var idb = window.indexedDB || window.webkitIndexedDB ||
window.mozIndexedDB || window.msIndexedDB;
/**
* Provide access to bookmarks, topsites, history, search engines and settings
* in IndexedDB.
* @namespace BrowserDB
*/
var BrowserDB = {
init: function browserDB_init(callback) {
this.db.open(callback);
},
/**
* Get all bookmarks.
* @param {Function} callback Runs on success with an array of bookmarks
*/
getBookmarks: function browserDB_getBookmarks(callback) {
this.db.getAllBookmarks(callback);
},
/**
* Reads visits from the database.
*/
readVisits: function browserDB_readVisits() {
return this.db.readVisits();
},
removeDB: function browserDB_removeDB() {
this.db.removeDB();
}
};
/**
* @memberOf BrowserDB
* @namespace BrowserDB.db
*/
BrowserDB.db = {
_db: null,
upgradeFrom: -1,
/**
* Open a IndexedDB database with name as 'browser' and version as 7.
* @param {Function} callback The callback to be run on success
*/
open: function db_open(callback) {
const DB_VERSION = 7;
const DB_NAME = 'browser';
var request = idb.open(DB_NAME, DB_VERSION);
request.onupgradeneeded = (function onUpgradeNeeded(e) {
console.log('Browser db upgrade needed, migrating so doesn\'t matter.');
this._db = e.target.result;
}).bind(this);
request.onsuccess = (function onSuccess(e) {
this._db = e.target.result;
callback();
}).bind(this);
request.onerror = (function onDatabaseError(e) {
console.log('Error opening browser database');
}).bind(this);
},
removeDB: function db_remove() {
this._db.close();
var request = window.indexedDB.deleteDatabase('browser');
request.onsuccess = function onSuccess(e) {
console.log('Browser Database migrated and deleted!');
};
request.onerror = function onSuccess(e) {
console.log('Database not deleted!');
};
},
getAllBookmarks: function db_getAllBookmarks(callback) {
var bookmarks = [];
var db = this._db;
function makeBookmarkProcessor(bookmark) {
return function(e) {
var place = e.target.result;
bookmark.iconUri = place.iconUri;
bookmarks.push(bookmark);
};
}
var transaction = db.transaction(['bookmarks', 'places']);
var bookmarksStore = transaction.objectStore('bookmarks');
var bookmarksIndex = bookmarksStore.index('timestamp');
var placesStore = transaction.objectStore('places');
bookmarksIndex.openCursor(null, 'prev').onsuccess =
function onSuccess(e) {
var cursor = e.target.result;
if (cursor) {
var bookmark = cursor.value;
placesStore.get(bookmark.uri).onsuccess =
makeBookmarkProcessor(bookmark);
cursor.continue();
}
};
transaction.oncomplete = function db_bookmarkTransactionComplete() {
callback(bookmarks);
};
},
readVisits: function db_readHistory() {
var places = {};
var db = this._db;
var transaction = db.transaction(['visits']);
var bookmarksStore = transaction.objectStore('visits');
var bookmarksIndex = bookmarksStore.index('timestamp');
function onCursor(e) {
var cursor = e.target.result;
if (cursor) {
if (!(cursor.value.uri in places)) {
places[cursor.value.uri] = {
visits: []
};
}
var place = places[cursor.value.uri];
if (cursor.value.title) {
place.title = cursor.value.title;
}
place.visits.unshift(cursor.value.timestamp);
if (place.visits.length > 20) {
place.visits.length = 20;
}
cursor.continue();
}
}
return new Promise(function(resolve) {
transaction.oncomplete = function() {
resolve(places);
};
bookmarksIndex.openCursor(null, 'prev').onsuccess = onCursor;
});
}
};
var BrowserMigrator = function BrowserMigrator() {
};
BrowserMigrator.prototype = {
/**
* A list of pending bookmarks to migrate.
*/
_pendingBookmarks: [],
runMigration: function() {
BrowserDB.init(() => {
BrowserDB.readVisits().then(visits => {
this._saveVisits(visits).then(() => {
BrowserDB.getBookmarks(bookmarks => {
this._pendingBookmarks = bookmarks;
this._iteratePendingBookmarks();
});
});
});
});
},
_saveVisits: function(visits) {
var urls = Object.keys(visits);
var places = new Places();
return new Promise(function(resolve) {
function saveVisit() {
if (!urls.length) {
resolve();
return;
}
var url = urls.shift();
places.setVisits(url, visits[url].visits).then(saveVisit);
}
places.start().then(saveVisit);
});
},
_iteratePendingBookmarks: function() {
// If there are no bookmarks left, we're done
if (!this._pendingBookmarks.length) {
BrowserDB.removeDB();
window.close();
return;
}
var nextBookmark = this._pendingBookmarks.shift();
var descriptor = {
id: nextBookmark.uri,
url: nextBookmark.uri,
name: nextBookmark.title,
icon: nextBookmark.iconUri
};
BookmarksDatabase.add(descriptor).then(() => {
this._iteratePendingBookmarks();
});
}
};