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+/*
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+"use strict";
+
+/*
+ * This file is generated from kinto.js - do not modify directly.
+ */
+
+// This is required because with Babel compiles ES2015 modules into a
+// require() form that tries to keep its modules on "this", but
+// doesn't specify "this", leaving it to default to the global
+// object. However, in strict mode, "this" no longer defaults to the
+// global object, so expose the global object explicitly. Babel's
+// compiled output will use a variable called "global" if one is
+// present.
+//
+// See https://bugzilla.mozilla.org/show_bug.cgi?id=1394556#c3 for
+// more details.
+const global = this;
+
+var EXPORTED_SYMBOLS = ["Kinto"];
+
+/*
+ * Version 13.0.0 - 7fbf95d
+ */
+
+(function (global, factory) {
+ typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+ typeof define === 'function' && define.amd ? define(factory) :
+ (global = global || self, global.Kinto = factory());
+}(this, (function () { 'use strict';
+
+ /**
+ * Base db adapter.
+ *
+ * @abstract
+ */
+ class BaseAdapter {
+ /**
+ * Deletes every records present in the database.
+ *
+ * @abstract
+ * @return {Promise}
+ */
+ clear() {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Executes a batch of operations within a single transaction.
+ *
+ * @abstract
+ * @param {Function} callback The operation callback.
+ * @param {Object} options The options object.
+ * @return {Promise}
+ */
+ execute(callback, options = { preload: [] }) {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Retrieve a record by its primary key from the database.
+ *
+ * @abstract
+ * @param {String} id The record id.
+ * @return {Promise}
+ */
+ get(id) {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Lists all records from the database.
+ *
+ * @abstract
+ * @param {Object} params The filters and order to apply to the results.
+ * @return {Promise}
+ */
+ list(params = { filters: {}, order: "" }) {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Store the lastModified value.
+ *
+ * @abstract
+ * @param {Number} lastModified
+ * @return {Promise}
+ */
+ saveLastModified(lastModified) {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Retrieve saved lastModified value.
+ *
+ * @abstract
+ * @return {Promise}
+ */
+ getLastModified() {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Load records in bulk that were exported from a server.
+ *
+ * @abstract
+ * @param {Array} records The records to load.
+ * @return {Promise}
+ */
+ importBulk(records) {
+ throw new Error("Not Implemented.");
+ }
+ /**
+ * Load a dump of records exported from a server.
+ *
+ * @deprecated Use {@link importBulk} instead.
+ * @abstract
+ * @param {Array} records The records to load.
+ * @return {Promise}
+ */
+ loadDump(records) {
+ throw new Error("Not Implemented.");
+ }
+ saveMetadata(metadata) {
+ throw new Error("Not Implemented.");
+ }
+ getMetadata() {
+ throw new Error("Not Implemented.");
+ }
+ }
+
+ const RE_RECORD_ID = /^[a-zA-Z0-9][a-zA-Z0-9_-]*$/;
+ /**
+ * Checks if a value is undefined.
+ * @param {Any} value
+ * @return {Boolean}
+ */
+ function _isUndefined(value) {
+ return typeof value === "undefined";
+ }
+ /**
+ * Sorts records in a list according to a given ordering.
+ *
+ * @param {String} order The ordering, eg. `-last_modified`.
+ * @param {Array} list The collection to order.
+ * @return {Array}
+ */
+ function sortObjects(order, list) {
+ const hasDash = order[0] === "-";
+ const field = hasDash ? order.slice(1) : order;
+ const direction = hasDash ? -1 : 1;
+ return list.slice().sort((a, b) => {
+ if (a[field] && _isUndefined(b[field])) {
+ return direction;
+ }
+ if (b[field] && _isUndefined(a[field])) {
+ return -direction;
+ }
+ if (_isUndefined(a[field]) && _isUndefined(b[field])) {
+ return 0;
+ }
+ return a[field] > b[field] ? direction : -direction;
+ });
+ }
+ /**
+ * Test if a single object matches all given filters.
+ *
+ * @param {Object} filters The filters object.
+ * @param {Object} entry The object to filter.
+ * @return {Boolean}
+ */
+ function filterObject(filters, entry) {
+ return Object.keys(filters).every(filter => {
+ const value = filters[filter];
+ if (Array.isArray(value)) {
+ return value.some(candidate => candidate === entry[filter]);
+ }
+ else if (typeof value === "object") {
+ return filterObject(value, entry[filter]);
+ }
+ else if (!Object.prototype.hasOwnProperty.call(entry, filter)) {
+ console.error(`The property ${filter} does not exist`);
+ return false;
+ }
+ return entry[filter] === value;
+ });
+ }
+ /**
+ * Resolves a list of functions sequentially, which can be sync or async; in
+ * case of async, functions must return a promise.
+ *
+ * @param {Array} fns The list of functions.
+ * @param {Any} init The initial value.
+ * @return {Promise}
+ */
+ function waterfall(fns, init) {
+ if (!fns.length) {
+ return Promise.resolve(init);
+ }
+ return fns.reduce((promise, nextFn) => {
+ return promise.then(nextFn);
+ }, Promise.resolve(init));
+ }
+ /**
+ * Simple deep object comparison function. This only supports comparison of
+ * serializable JavaScript objects.
+ *
+ * @param {Object} a The source object.
+ * @param {Object} b The compared object.
+ * @return {Boolean}
+ */
+ function deepEqual(a, b) {
+ if (a === b) {
+ return true;
+ }
+ if (typeof a !== typeof b) {
+ return false;
+ }
+ if (!(a && typeof a == "object") || !(b && typeof b == "object")) {
+ return false;
+ }
+ if (Object.keys(a).length !== Object.keys(b).length) {
+ return false;
+ }
+ for (const k in a) {
+ if (!deepEqual(a[k], b[k])) {
+ return false;
+ }
+ }
+ return true;
+ }
+ /**
+ * Return an object without the specified keys.
+ *
+ * @param {Object} obj The original object.
+ * @param {Array} keys The list of keys to exclude.
+ * @return {Object} A copy without the specified keys.
+ */
+ function omitKeys(obj, keys = []) {
+ const result = Object.assign({}, obj);
+ for (const key of keys) {
+ delete result[key];
+ }
+ return result;
+ }
+ function arrayEqual(a, b) {
+ if (a.length !== b.length) {
+ return false;
+ }
+ for (let i = a.length; i--;) {
+ if (a[i] !== b[i]) {
+ return false;
+ }
+ }
+ return true;
+ }
+ function makeNestedObjectFromArr(arr, val, nestedFiltersObj) {
+ const last = arr.length - 1;
+ return arr.reduce((acc, cv, i) => {
+ if (i === last) {
+ return (acc[cv] = val);
+ }
+ else if (Object.prototype.hasOwnProperty.call(acc, cv)) {
+ return acc[cv];
+ }
+ else {
+ return (acc[cv] = {});
+ }
+ }, nestedFiltersObj);
+ }
+ function transformSubObjectFilters(filtersObj) {
+ const transformedFilters = {};
+ for (const key in filtersObj) {
+ const keysArr = key.split(".");
+ const val = filtersObj[key];
+ makeNestedObjectFromArr(keysArr, val, transformedFilters);
+ }
+ return transformedFilters;
+ }
+
+ const INDEXED_FIELDS = ["id", "_status", "last_modified"];
+ /**
+ * Small helper that wraps the opening of an IndexedDB into a Promise.
+ *
+ * @param dbname {String} The database name.
+ * @param version {Integer} Schema version
+ * @param onupgradeneeded {Function} The callback to execute if schema is
+ * missing or different.
+ * @return {Promise<IDBDatabase>}
+ */
+ async function open(dbname, { version, onupgradeneeded }) {
+ return new Promise((resolve, reject) => {
+ const request = indexedDB.open(dbname, version);
+ request.onupgradeneeded = event => {
+ const db = event.target.result;
+ db.onerror = event => reject(event.target.error);
+ // When an upgrade is needed, a transaction is started.
+ const transaction = event.target.transaction;
+ transaction.onabort = event => {
+ const error = event.target.error ||
+ transaction.error ||
+ new DOMException("The operation has been aborted", "AbortError");
+ reject(error);
+ };
+ // Callback for store creation etc.
+ return onupgradeneeded(event);
+ };
+ request.onerror = event => {
+ reject(event.target.error);
+ };
+ request.onsuccess = event => {
+ const db = event.target.result;
+ resolve(db);
+ };
+ });
+ }
+ /**
+ * Helper to run the specified callback in a single transaction on the
+ * specified store.
+ * The helper focuses on transaction wrapping into a promise.
+ *
+ * @param db {IDBDatabase} The database instance.
+ * @param name {String} The store name.
+ * @param callback {Function} The piece of code to execute in the transaction.
+ * @param options {Object} Options.
+ * @param options.mode {String} Transaction mode (default: read).
+ * @return {Promise} any value returned by the callback.
+ */
+ async function execute(db, name, callback, options = {}) {
+ const { mode } = options;
+ return new Promise((resolve, reject) => {
+ // On Safari, calling IDBDatabase.transaction with mode == undefined raises
+ // a TypeError.
+ const transaction = mode
+ ? db.transaction([name], mode)
+ : db.transaction([name]);
+ const store = transaction.objectStore(name);
+ // Let the callback abort this transaction.
+ const abort = e => {
+ transaction.abort();
+ reject(e);
+ };
+ // Execute the specified callback **synchronously**.
+ let result;
+ try {
+ result = callback(store, abort);
+ }
+ catch (e) {
+ abort(e);
+ }
+ transaction.onerror = event => reject(event.target.error);
+ transaction.oncomplete = event => resolve(result);
+ transaction.onabort = event => {
+ const error = event.target.error ||
+ transaction.error ||
+ new DOMException("The operation has been aborted", "AbortError");
+ reject(error);
+ };
+ });
+ }
+ /**
+ * Helper to wrap the deletion of an IndexedDB database into a promise.
+ *
+ * @param dbName {String} the database to delete
+ * @return {Promise}
+ */
+ async function deleteDatabase(dbName) {
+ return new Promise((resolve, reject) => {
+ const request = indexedDB.deleteDatabase(dbName);
+ request.onsuccess = event => resolve(event.target);
+ request.onerror = event => reject(event.target.error);
+ });
+ }
+ /**
+ * IDB cursor handlers.
+ * @type {Object}
+ */
+ const cursorHandlers = {
+ all(filters, done) {
+ const results = [];
+ return event => {
+ const cursor = event.target.result;
+ if (cursor) {
+ const { value } = cursor;
+ if (filterObject(filters, value)) {
+ results.push(value);
+ }
+ cursor.continue();
+ }
+ else {
+ done(results);
+ }
+ };
+ },
+ in(values, filters, done) {
+ const results = [];
+ let i = 0;
+ return function (event) {
+ const cursor = event.target.result;
+ if (!cursor) {
+ done(results);
+ return;
+ }
+ const { key, value } = cursor;
+ // `key` can be an array of two values (see `keyPath` in indices definitions).
+ // `values` can be an array of arrays if we filter using an index whose key path
+ // is an array (eg. `cursorHandlers.in([["bid/cid", 42], ["bid/cid", 43]], ...)`)
+ while (key > values[i]) {
+ // The cursor has passed beyond this key. Check next.
+ ++i;
+ if (i === values.length) {
+ done(results); // There is no next. Stop searching.
+ return;
+ }
+ }
+ const isEqual = Array.isArray(key)
+ ? arrayEqual(key, values[i])
+ : key === values[i];
+ if (isEqual) {
+ if (filterObject(filters, value)) {
+ results.push(value);
+ }
+ cursor.continue();
+ }
+ else {
+ cursor.continue(values[i]);
+ }
+ };
+ },
+ };
+ /**
+ * Creates an IDB request and attach it the appropriate cursor event handler to
+ * perform a list query.
+ *
+ * Multiple matching values are handled by passing an array.
+ *
+ * @param {String} cid The collection id (ie. `{bid}/{cid}`)
+ * @param {IDBStore} store The IDB store.
+ * @param {Object} filters Filter the records by field.
+ * @param {Function} done The operation completion handler.
+ * @return {IDBRequest}
+ */
+ function createListRequest(cid, store, filters, done) {
+ const filterFields = Object.keys(filters);
+ // If no filters, get all results in one bulk.
+ if (filterFields.length == 0) {
+ const request = store.index("cid").getAll(IDBKeyRange.only(cid));
+ request.onsuccess = event => done(event.target.result);
+ return request;
+ }
+ // Introspect filters and check if they leverage an indexed field.
+ const indexField = filterFields.find(field => {
+ return INDEXED_FIELDS.includes(field);
+ });
+ if (!indexField) {
+ // Iterate on all records for this collection (ie. cid)
+ const isSubQuery = Object.keys(filters).some(key => key.includes(".")); // (ie. filters: {"article.title": "hello"})
+ if (isSubQuery) {
+ const newFilter = transformSubObjectFilters(filters);
+ const request = store.index("cid").openCursor(IDBKeyRange.only(cid));
+ request.onsuccess = cursorHandlers.all(newFilter, done);
+ return request;
+ }
+ const request = store.index("cid").openCursor(IDBKeyRange.only(cid));
+ request.onsuccess = cursorHandlers.all(filters, done);
+ return request;
+ }
+ // If `indexField` was used already, don't filter again.
+ const remainingFilters = omitKeys(filters, [indexField]);
+ // value specified in the filter (eg. `filters: { _status: ["created", "updated"] }`)
+ const value = filters[indexField];
+ // For the "id" field, use the primary key.
+ const indexStore = indexField == "id" ? store : store.index(indexField);
+ // WHERE IN equivalent clause
+ if (Array.isArray(value)) {
+ if (value.length === 0) {
+ return done([]);
+ }
+ const values = value.map(i => [cid, i]).sort();
+ const range = IDBKeyRange.bound(values[0], values[values.length - 1]);
+ const request = indexStore.openCursor(range);
+ request.onsuccess = cursorHandlers.in(values, remainingFilters, done);
+ return request;
+ }
+ // If no filters on custom attribute, get all results in one bulk.
+ if (remainingFilters.length == 0) {
+ const request = indexStore.getAll(IDBKeyRange.only([cid, value]));
+ request.onsuccess = event => done(event.target.result);
+ return request;
+ }
+ // WHERE field = value clause
+ const request = indexStore.openCursor(IDBKeyRange.only([cid, value]));
+ request.onsuccess = cursorHandlers.all(remainingFilters, done);
+ return request;
+ }
+ class IDBError extends Error {
+ constructor(method, err) {
+ super(`IndexedDB ${method}() ${err.message}`);
+ this.name = err.name;
+ this.stack = err.stack;
+ }
+ }
+ /**
+ * IndexedDB adapter.
+ *
+ * This adapter doesn't support any options.
+ */
+ class IDB extends BaseAdapter {
+ /* Expose the IDBError class publicly */
+ static get IDBError() {
+ return IDBError;
+ }
+ /**
+ * Constructor.
+ *
+ * @param {String} cid The key base for this collection (eg. `bid/cid`)
+ * @param {Object} options
+ * @param {String} options.dbName The IndexedDB name (default: `"KintoDB"`)
+ * @param {String} options.migrateOldData Whether old database data should be migrated (default: `false`)
+ */
+ constructor(cid, options = {}) {
+ super();
+ this.cid = cid;
+ this.dbName = options.dbName || "KintoDB";
+ this._options = options;
+ this._db = null;
+ }
+ _handleError(method, err) {
+ throw new IDBError(method, err);
+ }
+ /**
+ * Ensures a connection to the IndexedDB database has been opened.
+ *
+ * @override
+ * @return {Promise}
+ */
+ async open() {
+ if (this._db) {
+ return this;
+ }
+ // In previous versions, we used to have a database with name `${bid}/${cid}`.
+ // Check if it exists, and migrate data once new schema is in place.
+ // Note: the built-in migrations from IndexedDB can only be used if the
+ // database name does not change.
+ const dataToMigrate = this._options.migrateOldData
+ ? await migrationRequired(this.cid)
+ : null;
+ this._db = await open(this.dbName, {
+ version: 2,
+ onupgradeneeded: event => {
+ const db = event.target.result;
+ if (event.oldVersion < 1) {
+ // Records store
+ const recordsStore = db.createObjectStore("records", {
+ keyPath: ["_cid", "id"],
+ });
+ // An index to obtain all the records in a collection.
+ recordsStore.createIndex("cid", "_cid");
+ // Here we create indices for every known field in records by collection.
+ // Local record status ("synced", "created", "updated", "deleted")
+ recordsStore.createIndex("_status", ["_cid", "_status"]);
+ // Last modified field
+ recordsStore.createIndex("last_modified", ["_cid", "last_modified"]);
+ // Timestamps store
+ db.createObjectStore("timestamps", {
+ keyPath: "cid",
+ });
+ }
+ if (event.oldVersion < 2) {
+ // Collections store
+ db.createObjectStore("collections", {
+ keyPath: "cid",
+ });
+ }
+ },
+ });
+ if (dataToMigrate) {
+ const { records, timestamp } = dataToMigrate;
+ await this.importBulk(records);
+ await this.saveLastModified(timestamp);
+ console.log(`${this.cid}: data was migrated successfully.`);
+ // Delete the old database.
+ await deleteDatabase(this.cid);
+ console.warn(`${this.cid}: old database was deleted.`);
+ }
+ return this;
+ }
+ /**
+ * Closes current connection to the database.
+ *
+ * @override
+ * @return {Promise}
+ */
+ close() {
+ if (this._db) {
+ this._db.close(); // indexedDB.close is synchronous
+ this._db = null;
+ }
+ return Promise.resolve();
+ }
+ /**
+ * Returns a transaction and an object store for a store name.
+ *
+ * To determine if a transaction has completed successfully, we should rather
+ * listen to the transaction’s complete event rather than the IDBObjectStore
+ * request’s success event, because the transaction may still fail after the
+ * success event fires.
+ *
+ * @param {String} name Store name
+ * @param {Function} callback to execute
+ * @param {Object} options Options
+ * @param {String} options.mode Transaction mode ("readwrite" or undefined)
+ * @return {Object}
+ */
+ async prepare(name, callback, options) {
+ await this.open();
+ await execute(this._db, name, callback, options);
+ }
+ /**
+ * Deletes every records in the current collection.
+ *
+ * @override
+ * @return {Promise}
+ */
+ async clear() {
+ try {
+ await this.prepare("records", store => {
+ const range = IDBKeyRange.only(this.cid);
+ const request = store.index("cid").openKeyCursor(range);
+ request.onsuccess = event => {
+ const cursor = event.target.result;
+ if (cursor) {
+ store.delete(cursor.primaryKey);
+ cursor.continue();
+ }
+ };
+ return request;
+ }, { mode: "readwrite" });
+ }
+ catch (e) {
+ this._handleError("clear", e);
+ }
+ }
+ /**
+ * Executes the set of synchronous CRUD operations described in the provided
+ * callback within an IndexedDB transaction, for current db store.
+ *
+ * The callback will be provided an object exposing the following synchronous
+ * CRUD operation methods: get, create, update, delete.
+ *
+ * Important note: because limitations in IndexedDB implementations, no
+ * asynchronous code should be performed within the provided callback; the
+ * promise will therefore be rejected if the callback returns a Promise.
+ *
+ * Options:
+ * - {Array} preload: The list of record IDs to fetch and make available to
+ * the transaction object get() method (default: [])
+ *
+ * @example
+ * const db = new IDB("example");
+ * const result = await db.execute(transaction => {
+ * transaction.create({id: 1, title: "foo"});
+ * transaction.update({id: 2, title: "bar"});
+ * transaction.delete(3);
+ * return "foo";
+ * });
+ *
+ * @override
+ * @param {Function} callback The operation description callback.
+ * @param {Object} options The options object.
+ * @return {Promise}
+ */
+ async execute(callback, options = { preload: [] }) {
+ // Transactions in IndexedDB are autocommited when a callback does not
+ // perform any additional operation.
+ // The way Promises are implemented in Firefox (see https://bugzilla.mozilla.org/show_bug.cgi?id=1193394)
+ // prevents using within an opened transaction.
+ // To avoid managing asynchronocity in the specified `callback`, we preload
+ // a list of record in order to execute the `callback` synchronously.
+ // See also:
+ // - http://stackoverflow.com/a/28388805/330911
+ // - http://stackoverflow.com/a/10405196
+ // - https://jakearchibald.com/2015/tasks-microtasks-queues-and-schedules/
+ let result;
+ await this.prepare("records", (store, abort) => {
+ const runCallback = (preloaded = []) => {
+ // Expose a consistent API for every adapter instead of raw store methods.
+ const proxy = transactionProxy(this, store, preloaded);
+ // The callback is executed synchronously within the same transaction.
+ try {
+ const returned = callback(proxy);
+ if (returned instanceof Promise) {
+ // XXX: investigate how to provide documentation details in error.
+ throw new Error("execute() callback should not return a Promise.");
+ }
+ // Bring to scope that will be returned (once promise awaited).
+ result = returned;
+ }
+ catch (e) {
+ // The callback has thrown an error explicitly. Abort transaction cleanly.
+ abort(e);
+ }
+ };
+ // No option to preload records, go straight to `callback`.
+ if (!options.preload.length) {
+ return runCallback();
+ }
+ // Preload specified records using a list request.
+ const filters = { id: options.preload };
+ createListRequest(this.cid, store, filters, records => {
+ // Store obtained records by id.
+ const preloaded = {};
+ for (const record of records) {
+ delete record["_cid"];
+ preloaded[record.id] = record;
+ }
+ runCallback(preloaded);
+ });
+ }, { mode: "readwrite" });
+ return result;
+ }
+ /**
+ * Retrieve a record by its primary key from the IndexedDB database.
+ *
+ * @override
+ * @param {String} id The record id.
+ * @return {Promise}
+ */
+ async get(id) {
+ try {
+ let record;
+ await this.prepare("records", store => {
+ store.get([this.cid, id]).onsuccess = e => (record = e.target.result);
+ });
+ return record;
+ }
+ catch (e) {
+ this._handleError("get", e);
+ }
+ }
+ /**
+ * Lists all records from the IndexedDB database.
+ *
+ * @override
+ * @param {Object} params The filters and order to apply to the results.
+ * @return {Promise}
+ */
+ async list(params = { filters: {} }) {
+ const { filters } = params;
+ try {
+ let results = [];
+ await this.prepare("records", store => {
+ createListRequest(this.cid, store, filters, _results => {
+ // we have received all requested records that match the filters,
+ // we now park them within current scope and hide the `_cid` attribute.
+ for (const result of _results) {
+ delete result["_cid"];
+ }
+ results = _results;
+ });
+ });
+ // The resulting list of records is sorted.
+ // XXX: with some efforts, this could be fully implemented using IDB API.
+ return params.order ? sortObjects(params.order, results) : results;
+ }
+ catch (e) {
+ this._handleError("list", e);
+ }
+ }
+ /**
+ * Store the lastModified value into metadata store.
+ *
+ * @override
+ * @param {Number} lastModified
+ * @return {Promise}
+ */
+ async saveLastModified(lastModified) {
+ const value = parseInt(lastModified, 10) || null;
+ try {
+ await this.prepare("timestamps", store => {
+ if (value === null) {
+ store.delete(this.cid);
+ }
+ else {
+ store.put({ cid: this.cid, value });
+ }
+ }, { mode: "readwrite" });
+ return value;
+ }
+ catch (e) {
+ this._handleError("saveLastModified", e);
+ }
+ }
+ /**
+ * Retrieve saved lastModified value.
+ *
+ * @override
+ * @return {Promise}
+ */
+ async getLastModified() {
+ try {
+ let entry = null;
+ await this.prepare("timestamps", store => {
+ store.get(this.cid).onsuccess = e => (entry = e.target.result);
+ });
+ return entry ? entry.value : null;
+ }
+ catch (e) {
+ this._handleError("getLastModified", e);
+ }
+ }
+ /**
+ * Load a dump of records exported from a server.
+ *
+ * @deprecated Use {@link importBulk} instead.
+ * @abstract
+ * @param {Array} records The records to load.
+ * @return {Promise}
+ */
+ async loadDump(records) {
+ return this.importBulk(records);
+ }
+ /**
+ * Load records in bulk that were exported from a server.
+ *
+ * @abstract
+ * @param {Array} records The records to load.
+ * @return {Promise}
+ */
+ async importBulk(records) {
+ try {
+ await this.execute(transaction => {
+ // Since the put operations are asynchronous, we chain
+ // them together. The last one will be waited for the
+ // `transaction.oncomplete` callback. (see #execute())
+ let i = 0;
+ putNext();
+ function putNext() {
+ if (i == records.length) {
+ return;
+ }
+ // On error, `transaction.onerror` is called.
+ transaction.update(records[i]).onsuccess = putNext;
+ ++i;
+ }
+ });
+ const previousLastModified = await this.getLastModified();
+ const lastModified = Math.max(...records.map(record => record.last_modified));
+ if (lastModified > previousLastModified) {
+ await this.saveLastModified(lastModified);
+ }
+ return records;
+ }
+ catch (e) {
+ this._handleError("importBulk", e);
+ }
+ }
+ async saveMetadata(metadata) {
+ try {
+ await this.prepare("collections", store => store.put({ cid: this.cid, metadata }), { mode: "readwrite" });
+ return metadata;
+ }
+ catch (e) {
+ this._handleError("saveMetadata", e);
+ }
+ }
+ async getMetadata() {
+ try {
+ let entry = null;
+ await this.prepare("collections", store => {
+ store.get(this.cid).onsuccess = e => (entry = e.target.result);
+ });
+ return entry ? entry.metadata : null;
+ }
+ catch (e) {
+ this._handleError("getMetadata", e);
+ }
+ }
+ }
+ /**
+ * IDB transaction proxy.
+ *
+ * @param {IDB} adapter The call IDB adapter
+ * @param {IDBStore} store The IndexedDB database store.
+ * @param {Array} preloaded The list of records to make available to
+ * get() (default: []).
+ * @return {Object}
+ */
+ function transactionProxy(adapter, store, preloaded = []) {
+ const _cid = adapter.cid;
+ return {
+ create(record) {
+ store.add(Object.assign(Object.assign({}, record), { _cid }));
+ },
+ update(record) {
+ return store.put(Object.assign(Object.assign({}, record), { _cid }));
+ },
+ delete(id) {
+ store.delete([_cid, id]);
+ },
+ get(id) {
+ return preloaded[id];
+ },
+ };
+ }
+ /**
+ * Up to version 10.X of kinto.js, each collection had its own collection.
+ * The database name was `${bid}/${cid}` (eg. `"blocklists/certificates"`)
+ * and contained only one store with the same name.
+ */
+ async function migrationRequired(dbName) {
+ let exists = true;
+ const db = await open(dbName, {
+ version: 1,
+ onupgradeneeded: event => {
+ exists = false;
+ },
+ });
+ // Check that the DB we're looking at is really a legacy one,
+ // and not some remainder of the open() operation above.
+ exists &=
+ db.objectStoreNames.contains("__meta__") &&
+ db.objectStoreNames.contains(dbName);
+ if (!exists) {
+ db.close();
+ // Testing the existence creates it, so delete it :)
+ await deleteDatabase(dbName);
+ return null;
+ }
+ console.warn(`${dbName}: old IndexedDB database found.`);
+ try {
+ // Scan all records.
+ let records;
+ await execute(db, dbName, store => {
+ store.openCursor().onsuccess = cursorHandlers.all({}, res => (records = res));
+ });
+ console.log(`${dbName}: found ${records.length} records.`);
+ // Check if there's a entry for this.
+ let timestamp = null;
+ await execute(db, "__meta__", store => {
+ store.get(`${dbName}-lastModified`).onsuccess = e => {
+ timestamp = e.target.result ? e.target.result.value : null;
+ };
+ });
+ // Some previous versions, also used to store the timestamps without prefix.
+ if (!timestamp) {
+ await execute(db, "__meta__", store => {
+ store.get("lastModified").onsuccess = e => {
+ timestamp = e.target.result ? e.target.result.value : null;
+ };
+ });
+ }
+ console.log(`${dbName}: ${timestamp ? "found" : "no"} timestamp.`);
+ // Those will be inserted in the new database/schema.
+ return { records, timestamp };
+ }
+ catch (e) {
+ console.error("Error occured during migration", e);
+ return null;
+ }
+ finally {
+ db.close();
+ }
+ }
+
+ var uuid4 = {};
+
+ const RECORD_FIELDS_TO_CLEAN = ["_status"];
+ const AVAILABLE_HOOKS = ["incoming-changes"];
+ const IMPORT_CHUNK_SIZE = 200;
+ /**
+ * Compare two records omitting local fields and synchronization
+ * attributes (like _status and last_modified)
+ * @param {Object} a A record to compare.
+ * @param {Object} b A record to compare.
+ * @param {Array} localFields Additional fields to ignore during the comparison
+ * @return {boolean}
+ */
+ function recordsEqual(a, b, localFields = []) {
+ const fieldsToClean = RECORD_FIELDS_TO_CLEAN.concat(["last_modified"]).concat(localFields);
+ const cleanLocal = r => omitKeys(r, fieldsToClean);
+ return deepEqual(cleanLocal(a), cleanLocal(b));
+ }
+ /**
+ * Synchronization result object.
+ */
+ class SyncResultObject {
+ /**
+ * Public constructor.
+ */
+ constructor() {
+ /**
+ * Current synchronization result status; becomes `false` when conflicts or
+ * errors are registered.
+ * @type {Boolean}
+ */
+ this.lastModified = null;
+ this._lists = {};
+ [
+ "errors",
+ "created",
+ "updated",
+ "deleted",
+ "published",
+ "conflicts",
+ "skipped",
+ "resolved",
+ "void",
+ ].forEach(l => (this._lists[l] = []));
+ this._cached = {};
+ }
+ /**
+ * Adds entries for a given result type.
+ *
+ * @param {String} type The result type.
+ * @param {Array} entries The result entries.
+ * @return {SyncResultObject}
+ */
+ add(type, entries) {
+ if (!Array.isArray(this._lists[type])) {
+ console.warn(`Unknown type "${type}"`);
+ return;
+ }
+ if (!Array.isArray(entries)) {
+ entries = [entries];
+ }
+ this._lists[type] = this._lists[type].concat(entries);
+ delete this._cached[type];
+ return this;
+ }
+ get ok() {
+ return this.errors.length + this.conflicts.length === 0;
+ }
+ get errors() {
+ return this._lists["errors"];
+ }
+ get conflicts() {
+ return this._lists["conflicts"];
+ }
+ get skipped() {
+ return this._deduplicate("skipped");
+ }
+ get resolved() {
+ return this._deduplicate("resolved");
+ }
+ get created() {
+ return this._deduplicate("created");
+ }
+ get updated() {
+ return this._deduplicate("updated");
+ }
+ get deleted() {
+ return this._deduplicate("deleted");
+ }
+ get published() {
+ return this._deduplicate("published");
+ }
+ _deduplicate(list) {
+ if (!(list in this._cached)) {
+ // Deduplicate entries by id. If the values don't have `id` attribute, just
+ // keep all.
+ const recordsWithoutId = new Set();
+ const recordsById = new Map();
+ this._lists[list].forEach(record => {
+ if (!record.id) {
+ recordsWithoutId.add(record);
+ }
+ else {
+ recordsById.set(record.id, record);
+ }
+ });
+ this._cached[list] = Array.from(recordsById.values()).concat(Array.from(recordsWithoutId));
+ }
+ return this._cached[list];
+ }
+ /**
+ * Reinitializes result entries for a given result type.
+ *
+ * @param {String} type The result type.
+ * @return {SyncResultObject}
+ */
+ reset(type) {
+ this._lists[type] = [];
+ delete this._cached[type];
+ return this;
+ }
+ toObject() {
+ // Only used in tests.
+ return {
+ ok: this.ok,
+ lastModified: this.lastModified,
+ errors: this.errors,
+ created: this.created,
+ updated: this.updated,
+ deleted: this.deleted,
+ skipped: this.skipped,
+ published: this.published,
+ conflicts: this.conflicts,
+ resolved: this.resolved,
+ };
+ }
+ }
+ class ServerWasFlushedError extends Error {
+ constructor(clientTimestamp, serverTimestamp, message) {
+ super(message);
+ if (Error.captureStackTrace) {
+ Error.captureStackTrace(this, ServerWasFlushedError);
+ }
+ this.clientTimestamp = clientTimestamp;
+ this.serverTimestamp = serverTimestamp;
+ }
+ }
+ function createUUIDSchema() {
+ return {
+ generate() {
+ return uuid4();
+ },
+ validate(id) {
+ return typeof id == "string" && RE_RECORD_ID.test(id);
+ },
+ };
+ }
+ function markStatus(record, status) {
+ return Object.assign(Object.assign({}, record), { _status: status });
+ }
+ function markDeleted(record) {
+ return markStatus(record, "deleted");
+ }
+ function markSynced(record) {
+ return markStatus(record, "synced");
+ }
+ /**
+ * Import a remote change into the local database.
+ *
+ * @param {IDBTransactionProxy} transaction The transaction handler.
+ * @param {Object} remote The remote change object to import.
+ * @param {Array<String>} localFields The list of fields that remain local.
+ * @param {String} strategy The {@link Collection.strategy}.
+ * @return {Object}
+ */
+ function importChange(transaction, remote, localFields, strategy) {
+ const local = transaction.get(remote.id);
+ if (!local) {
+ // Not found locally but remote change is marked as deleted; skip to
+ // avoid recreation.
+ if (remote.deleted) {
+ return { type: "skipped", data: remote };
+ }
+ const synced = markSynced(remote);
+ transaction.create(synced);
+ return { type: "created", data: synced };
+ }
+ // Apply remote changes on local record.
+ const synced = Object.assign(Object.assign({}, local), markSynced(remote));
+ // With pull only, we don't need to compare records since we override them.
+ if (strategy === Collection.strategy.PULL_ONLY) {
+ if (remote.deleted) {
+ transaction.delete(remote.id);
+ return { type: "deleted", data: local };
+ }
+ transaction.update(synced);
+ return { type: "updated", data: { old: local, new: synced } };
+ }
+ // With other sync strategies, we detect conflicts,
+ // by comparing local and remote, ignoring local fields.
+ const isIdentical = recordsEqual(local, remote, localFields);
+ // Detect or ignore conflicts if record has also been modified locally.
+ if (local._status !== "synced") {
+ // Locally deleted, unsynced: scheduled for remote deletion.
+ if (local._status === "deleted") {
+ return { type: "skipped", data: local };
+ }
+ if (isIdentical) {
+ // If records are identical, import anyway, so we bump the
+ // local last_modified value from the server and set record
+ // status to "synced".
+ transaction.update(synced);
+ return { type: "updated", data: { old: local, new: synced } };
+ }
+ if (local.last_modified !== undefined &&
+ local.last_modified === remote.last_modified) {
+ // If our local version has the same last_modified as the remote
+ // one, this represents an object that corresponds to a resolved
+ // conflict. Our local version represents the final output, so
+ // we keep that one. (No transaction operation to do.)
+ // But if our last_modified is undefined,
+ // that means we've created the same object locally as one on
+ // the server, which *must* be a conflict.
+ return { type: "void" };
+ }
+ return {
+ type: "conflicts",
+ data: { type: "incoming", local: local, remote: remote },
+ };
+ }
+ // Local record was synced.
+ if (remote.deleted) {
+ transaction.delete(remote.id);
+ return { type: "deleted", data: local };
+ }
+ // Import locally.
+ transaction.update(synced);
+ // if identical, simply exclude it from all SyncResultObject lists
+ const type = isIdentical ? "void" : "updated";
+ return { type, data: { old: local, new: synced } };
+ }
+ /**
+ * Abstracts a collection of records stored in the local database, providing
+ * CRUD operations and synchronization helpers.
+ */
+ class Collection {
+ /**
+ * Constructor.
+ *
+ * Options:
+ * - `{BaseAdapter} adapter` The DB adapter (default: `IDB`)
+ *
+ * @param {String} bucket The bucket identifier.
+ * @param {String} name The collection name.
+ * @param {KintoBase} kinto The Kinto instance.
+ * @param {Object} options The options object.
+ */
+ constructor(bucket, name, kinto, options = {}) {
+ this._bucket = bucket;
+ this._name = name;
+ this._lastModified = null;
+ const DBAdapter = options.adapter || IDB;
+ if (!DBAdapter) {
+ throw new Error("No adapter provided");
+ }
+ const db = new DBAdapter(`${bucket}/${name}`, options.adapterOptions);
+ if (!(db instanceof BaseAdapter)) {
+ throw new Error("Unsupported adapter.");
+ }
+ // public properties
+ /**
+ * The db adapter instance
+ * @type {BaseAdapter}
+ */
+ this.db = db;
+ /**
+ * The KintoBase instance.
+ * @type {KintoBase}
+ */
+ this.kinto = kinto;
+ /**
+ * The event emitter instance.
+ * @type {EventEmitter}
+ */
+ this.events = options.events;
+ /**
+ * The IdSchema instance.
+ * @type {Object}
+ */
+ this.idSchema = this._validateIdSchema(options.idSchema);
+ /**
+ * The list of remote transformers.
+ * @type {Array}
+ */
+ this.remoteTransformers = this._validateRemoteTransformers(options.remoteTransformers);
+ /**
+ * The list of hooks.
+ * @type {Object}
+ */
+ this.hooks = this._validateHooks(options.hooks);
+ /**
+ * The list of fields names that will remain local.
+ * @type {Array}
+ */
+ this.localFields = options.localFields || [];
+ }
+ /**
+ * The HTTP client.
+ * @type {KintoClient}
+ */
+ get api() {
+ return this.kinto.api;
+ }
+ /**
+ * The collection name.
+ * @type {String}
+ */
+ get name() {
+ return this._name;
+ }
+ /**
+ * The bucket name.
+ * @type {String}
+ */
+ get bucket() {
+ return this._bucket;
+ }
+ /**
+ * The last modified timestamp.
+ * @type {Number}
+ */
+ get lastModified() {
+ return this._lastModified;
+ }
+ /**
+ * Synchronization strategies. Available strategies are:
+ *
+ * - `MANUAL`: Conflicts will be reported in a dedicated array.
+ * - `SERVER_WINS`: Conflicts are resolved using remote data.
+ * - `CLIENT_WINS`: Conflicts are resolved using local data.
+ *
+ * @type {Object}
+ */
+ static get strategy() {
+ return {
+ CLIENT_WINS: "client_wins",
+ SERVER_WINS: "server_wins",
+ PULL_ONLY: "pull_only",
+ MANUAL: "manual",
+ };
+ }
+ /**
+ * Validates an idSchema.
+ *
+ * @param {Object|undefined} idSchema
+ * @return {Object}
+ */
+ _validateIdSchema(idSchema) {
+ if (typeof idSchema === "undefined") {
+ return createUUIDSchema();
+ }
+ if (typeof idSchema !== "object") {
+ throw new Error("idSchema must be an object.");
+ }
+ else if (typeof idSchema.generate !== "function") {
+ throw new Error("idSchema must provide a generate function.");
+ }
+ else if (typeof idSchema.validate !== "function") {
+ throw new Error("idSchema must provide a validate function.");
+ }
+ return idSchema;
+ }
+ /**
+ * Validates a list of remote transformers.
+ *
+ * @param {Array|undefined} remoteTransformers
+ * @return {Array}
+ */
+ _validateRemoteTransformers(remoteTransformers) {
+ if (typeof remoteTransformers === "undefined") {
+ return [];
+ }
+ if (!Array.isArray(remoteTransformers)) {
+ throw new Error("remoteTransformers should be an array.");
+ }
+ return remoteTransformers.map(transformer => {
+ if (typeof transformer !== "object") {
+ throw new Error("A transformer must be an object.");
+ }
+ else if (typeof transformer.encode !== "function") {
+ throw new Error("A transformer must provide an encode function.");
+ }
+ else if (typeof transformer.decode !== "function") {
+ throw new Error("A transformer must provide a decode function.");
+ }
+ return transformer;
+ });
+ }
+ /**
+ * Validate the passed hook is correct.
+ *
+ * @param {Array|undefined} hook.
+ * @return {Array}
+ **/
+ _validateHook(hook) {
+ if (!Array.isArray(hook)) {
+ throw new Error("A hook definition should be an array of functions.");
+ }
+ return hook.map(fn => {
+ if (typeof fn !== "function") {
+ throw new Error("A hook definition should be an array of functions.");
+ }
+ return fn;
+ });
+ }
+ /**
+ * Validates a list of hooks.
+ *
+ * @param {Object|undefined} hooks
+ * @return {Object}
+ */
+ _validateHooks(hooks) {
+ if (typeof hooks === "undefined") {
+ return {};
+ }
+ if (Array.isArray(hooks)) {
+ throw new Error("hooks should be an object, not an array.");
+ }
+ if (typeof hooks !== "object") {
+ throw new Error("hooks should be an object.");
+ }
+ const validatedHooks = {};
+ for (const hook in hooks) {
+ if (!AVAILABLE_HOOKS.includes(hook)) {
+ throw new Error("The hook should be one of " + AVAILABLE_HOOKS.join(", "));
+ }
+ validatedHooks[hook] = this._validateHook(hooks[hook]);
+ }
+ return validatedHooks;
+ }
+ /**
+ * Deletes every records in the current collection and marks the collection as
+ * never synced.
+ *
+ * @return {Promise}
+ */
+ async clear() {
+ await this.db.clear();
+ await this.db.saveMetadata(null);
+ await this.db.saveLastModified(null);
+ return { data: [], permissions: {} };
+ }
+ /**
+ * Encodes a record.
+ *
+ * @param {String} type Either "remote" or "local".
+ * @param {Object} record The record object to encode.
+ * @return {Promise}
+ */
+ _encodeRecord(type, record) {
+ if (!this[`${type}Transformers`].length) {
+ return Promise.resolve(record);
+ }
+ return waterfall(this[`${type}Transformers`].map(transformer => {
+ return record => transformer.encode(record);
+ }), record);
+ }
+ /**
+ * Decodes a record.
+ *
+ * @param {String} type Either "remote" or "local".
+ * @param {Object} record The record object to decode.
+ * @return {Promise}
+ */
+ _decodeRecord(type, record) {
+ if (!this[`${type}Transformers`].length) {
+ return Promise.resolve(record);
+ }
+ return waterfall(this[`${type}Transformers`].reverse().map(transformer => {
+ return record => transformer.decode(record);
+ }), record);
+ }
+ /**
+ * Adds a record to the local database, asserting that none
+ * already exist with this ID.
+ *
+ * Note: If either the `useRecordId` or `synced` options are true, then the
+ * record object must contain the id field to be validated. If none of these
+ * options are true, an id is generated using the current IdSchema; in this
+ * case, the record passed must not have an id.
+ *
+ * Options:
+ * - {Boolean} synced Sets record status to "synced" (default: `false`).
+ * - {Boolean} useRecordId Forces the `id` field from the record to be used,
+ * instead of one that is generated automatically
+ * (default: `false`).
+ *
+ * @param {Object} record
+ * @param {Object} options
+ * @return {Promise}
+ */
+ create(record, options = { useRecordId: false, synced: false }) {
+ // Validate the record and its ID (if any), even though this
+ // validation is also done in the CollectionTransaction method,
+ // because we need to pass the ID to preloadIds.
+ const reject = msg => Promise.reject(new Error(msg));
+ if (typeof record !== "object") {
+ return reject("Record is not an object.");
+ }
+ if ((options.synced || options.useRecordId) &&
+ !Object.prototype.hasOwnProperty.call(record, "id")) {
+ return reject("Missing required Id; synced and useRecordId options require one");
+ }
+ if (!options.synced &&
+ !options.useRecordId &&
+ Object.prototype.hasOwnProperty.call(record, "id")) {
+ return reject("Extraneous Id; can't create a record having one set.");
+ }
+ const newRecord = Object.assign(Object.assign({}, record), { id: options.synced || options.useRecordId
+ ? record.id
+ : this.idSchema.generate(record), _status: options.synced ? "synced" : "created" });
+ if (!this.idSchema.validate(newRecord.id)) {
+ return reject(`Invalid Id: ${newRecord.id}`);
+ }
+ return this.execute(txn => txn.create(newRecord), {
+ preloadIds: [newRecord.id],
+ }).catch(err => {
+ if (options.useRecordId) {
+ throw new Error("Couldn't create record. It may have been virtually deleted.");
+ }
+ throw err;
+ });
+ }
+ /**
+ * Like {@link CollectionTransaction#update}, but wrapped in its own transaction.
+ *
+ * Options:
+ * - {Boolean} synced: Sets record status to "synced" (default: false)
+ * - {Boolean} patch: Extends the existing record instead of overwriting it
+ * (default: false)
+ *
+ * @param {Object} record
+ * @param {Object} options
+ * @return {Promise}
+ */
+ update(record, options = { synced: false, patch: false }) {
+ // Validate the record and its ID, even though this validation is
+ // also done in the CollectionTransaction method, because we need
+ // to pass the ID to preloadIds.
+ if (typeof record !== "object") {
+ return Promise.reject(new Error("Record is not an object."));
+ }
+ if (!Object.prototype.hasOwnProperty.call(record, "id")) {
+ return Promise.reject(new Error("Cannot update a record missing id."));
+ }
+ if (!this.idSchema.validate(record.id)) {
+ return Promise.reject(new Error(`Invalid Id: ${record.id}`));
+ }
+ return this.execute(txn => txn.update(record, options), {
+ preloadIds: [record.id],
+ });
+ }
+ /**
+ * Like {@link CollectionTransaction#upsert}, but wrapped in its own transaction.
+ *
+ * @param {Object} record
+ * @return {Promise}
+ */
+ upsert(record) {
+ // Validate the record and its ID, even though this validation is
+ // also done in the CollectionTransaction method, because we need
+ // to pass the ID to preloadIds.
+ if (typeof record !== "object") {
+ return Promise.reject(new Error("Record is not an object."));
+ }
+ if (!Object.prototype.hasOwnProperty.call(record, "id")) {
+ return Promise.reject(new Error("Cannot update a record missing id."));
+ }
+ if (!this.idSchema.validate(record.id)) {
+ return Promise.reject(new Error(`Invalid Id: ${record.id}`));
+ }
+ return this.execute(txn => txn.upsert(record), { preloadIds: [record.id] });
+ }
+ /**
+ * Like {@link CollectionTransaction#get}, but wrapped in its own transaction.
+ *
+ * Options:
+ * - {Boolean} includeDeleted: Include virtually deleted records.
+ *
+ * @param {String} id
+ * @param {Object} options
+ * @return {Promise}
+ */
+ get(id, options = { includeDeleted: false }) {
+ return this.execute(txn => txn.get(id, options), { preloadIds: [id] });
+ }
+ /**
+ * Like {@link CollectionTransaction#getAny}, but wrapped in its own transaction.
+ *
+ * @param {String} id
+ * @return {Promise}
+ */
+ getAny(id) {
+ return this.execute(txn => txn.getAny(id), { preloadIds: [id] });
+ }
+ /**
+ * Same as {@link Collection#delete}, but wrapped in its own transaction.
+ *
+ * Options:
+ * - {Boolean} virtual: When set to `true`, doesn't actually delete the record,
+ * update its `_status` attribute to `deleted` instead (default: true)
+ *
+ * @param {String} id The record's Id.
+ * @param {Object} options The options object.
+ * @return {Promise}
+ */
+ delete(id, options = { virtual: true }) {
+ return this.execute(transaction => {
+ return transaction.delete(id, options);
+ }, { preloadIds: [id] });
+ }
+ /**
+ * Same as {@link Collection#deleteAll}, but wrapped in its own transaction, execulding the parameter.
+ *
+ * @return {Promise}
+ */
+ async deleteAll() {
+ const { data } = await this.list({}, { includeDeleted: false });
+ const recordIds = data.map(record => record.id);
+ return this.execute(transaction => {
+ return transaction.deleteAll(recordIds);
+ }, { preloadIds: recordIds });
+ }
+ /**
+ * The same as {@link CollectionTransaction#deleteAny}, but wrapped
+ * in its own transaction.
+ *
+ * @param {String} id The record's Id.
+ * @return {Promise}
+ */
+ deleteAny(id) {
+ return this.execute(txn => txn.deleteAny(id), { preloadIds: [id] });
+ }
+ /**
+ * Lists records from the local database.
+ *
+ * Params:
+ * - {Object} filters Filter the results (default: `{}`).
+ * - {String} order The order to apply (default: `-last_modified`).
+ *
+ * Options:
+ * - {Boolean} includeDeleted: Include virtually deleted records.
+ *
+ * @param {Object} params The filters and order to apply to the results.
+ * @param {Object} options The options object.
+ * @return {Promise}
+ */
+ async list(params = {}, options = { includeDeleted: false }) {
+ params = Object.assign({ order: "-last_modified", filters: {} }, params);
+ const results = await this.db.list(params);
+ let data = results;
+ if (!options.includeDeleted) {
+ data = results.filter(record => record._status !== "deleted");
+ }
+ return { data, permissions: {} };
+ }
+ /**
+ * Imports remote changes into the local database.
+ * This method is in charge of detecting the conflicts, and resolve them
+ * according to the specified strategy.
+ * @param {SyncResultObject} syncResultObject The sync result object.
+ * @param {Array} decodedChanges The list of changes to import in the local database.
+ * @param {String} strategy The {@link Collection.strategy} (default: MANUAL)
+ * @return {Promise}
+ */
+ async importChanges(syncResultObject, decodedChanges, strategy = Collection.strategy.MANUAL) {
+ // Retrieve records matching change ids.
+ try {
+ for (let i = 0; i < decodedChanges.length; i += IMPORT_CHUNK_SIZE) {
+ const slice = decodedChanges.slice(i, i + IMPORT_CHUNK_SIZE);
+ const { imports, resolved } = await this.db.execute(transaction => {
+ const imports = slice.map(remote => {
+ // Store remote change into local database.
+ return importChange(transaction, remote, this.localFields, strategy);
+ });
+ const conflicts = imports
+ .filter(i => i.type === "conflicts")
+ .map(i => i.data);
+ const resolved = this._handleConflicts(transaction, conflicts, strategy);
+ return { imports, resolved };
+ }, { preload: slice.map(record => record.id) });
+ // Lists of created/updated/deleted records
+ imports.forEach(({ type, data }) => syncResultObject.add(type, data));
+ // Automatically resolved conflicts (if not manual)
+ if (resolved.length > 0) {
+ syncResultObject.reset("conflicts").add("resolved", resolved);
+ }
+ }
+ }
+ catch (err) {
+ const data = {
+ type: "incoming",
+ message: err.message,
+ stack: err.stack,
+ };
+ // XXX one error of the whole transaction instead of per atomic op
+ syncResultObject.add("errors", data);
+ }
+ return syncResultObject;
+ }
+ /**
+ * Imports the responses of pushed changes into the local database.
+ * Basically it stores the timestamp assigned by the server into the local
+ * database.
+ * @param {SyncResultObject} syncResultObject The sync result object.
+ * @param {Array} toApplyLocally The list of changes to import in the local database.
+ * @param {Array} conflicts The list of conflicts that have to be resolved.
+ * @param {String} strategy The {@link Collection.strategy}.
+ * @return {Promise}
+ */
+ async _applyPushedResults(syncResultObject, toApplyLocally, conflicts, strategy = Collection.strategy.MANUAL) {
+ const toDeleteLocally = toApplyLocally.filter(r => r.deleted);
+ const toUpdateLocally = toApplyLocally.filter(r => !r.deleted);
+ const { published, resolved } = await this.db.execute(transaction => {
+ const updated = toUpdateLocally.map(record => {
+ const synced = markSynced(record);
+ transaction.update(synced);
+ return synced;
+ });
+ const deleted = toDeleteLocally.map(record => {
+ transaction.delete(record.id);
+ // Amend result data with the deleted attribute set
+ return { id: record.id, deleted: true };
+ });
+ const published = updated.concat(deleted);
+ // Handle conflicts, if any
+ const resolved = this._handleConflicts(transaction, conflicts, strategy);
+ return { published, resolved };
+ });
+ syncResultObject.add("published", published);
+ if (resolved.length > 0) {
+ syncResultObject
+ .reset("conflicts")
+ .reset("resolved")
+ .add("resolved", resolved);
+ }
+ return syncResultObject;
+ }
+ /**
+ * Handles synchronization conflicts according to specified strategy.
+ *
+ * @param {SyncResultObject} result The sync result object.
+ * @param {String} strategy The {@link Collection.strategy}.
+ * @return {Promise<Array<Object>>} The resolved conflicts, as an
+ * array of {accepted, rejected} objects
+ */
+ _handleConflicts(transaction, conflicts, strategy) {
+ if (strategy === Collection.strategy.MANUAL) {
+ return [];
+ }
+ return conflicts.map(conflict => {
+ const resolution = strategy === Collection.strategy.CLIENT_WINS
+ ? conflict.local
+ : conflict.remote;
+ const rejected = strategy === Collection.strategy.CLIENT_WINS
+ ? conflict.remote
+ : conflict.local;
+ let accepted, status, id;
+ if (resolution === null) {
+ // We "resolved" with the server-side deletion. Delete locally.
+ // This only happens during SERVER_WINS because the local
+ // version of a record can never be null.
+ // We can get "null" from the remote side if we got a conflict
+ // and there is no remote version available; see kinto-http.js
+ // batch.js:aggregate.
+ transaction.delete(conflict.local.id);
+ accepted = null;
+ // The record was deleted, but that status is "synced" with
+ // the server, so we don't need to push the change.
+ status = "synced";
+ id = conflict.local.id;
+ }
+ else {
+ const updated = this._resolveRaw(conflict, resolution);
+ transaction.update(updated);
+ accepted = updated;
+ status = updated._status;
+ id = updated.id;
+ }
+ return { rejected, accepted, id, _status: status };
+ });
+ }
+ /**
+ * Execute a bunch of operations in a transaction.
+ *
+ * This transaction should be atomic -- either all of its operations
+ * will succeed, or none will.
+ *
+ * The argument to this function is itself a function which will be
+ * called with a {@link CollectionTransaction}. Collection methods
+ * are available on this transaction, but instead of returning
+ * promises, they are synchronous. execute() returns a Promise whose
+ * value will be the return value of the provided function.
+ *
+ * Most operations will require access to the record itself, which
+ * must be preloaded by passing its ID in the preloadIds option.
+ *
+ * Options:
+ * - {Array} preloadIds: list of IDs to fetch at the beginning of
+ * the transaction
+ *
+ * @return {Promise} Resolves with the result of the given function
+ * when the transaction commits.
+ */
+ execute(doOperations, { preloadIds = [] } = {}) {
+ for (const id of preloadIds) {
+ if (!this.idSchema.validate(id)) {
+ return Promise.reject(Error(`Invalid Id: ${id}`));
+ }
+ }
+ return this.db.execute(transaction => {
+ const txn = new CollectionTransaction(this, transaction);
+ const result = doOperations(txn);
+ txn.emitEvents();
+ return result;
+ }, { preload: preloadIds });
+ }
+ /**
+ * Resets the local records as if they were never synced; existing records are
+ * marked as newly created, deleted records are dropped.
+ *
+ * A next call to {@link Collection.sync} will thus republish the whole
+ * content of the local collection to the server.
+ *
+ * @return {Promise} Resolves with the number of processed records.
+ */
+ async resetSyncStatus() {
+ const unsynced = await this.list({ filters: { _status: ["deleted", "synced"] }, order: "" }, { includeDeleted: true });
+ await this.db.execute(transaction => {
+ unsynced.data.forEach(record => {
+ if (record._status === "deleted") {
+ // Garbage collect deleted records.
+ transaction.delete(record.id);
+ }
+ else {
+ // Records that were synced become «created».
+ transaction.update(Object.assign(Object.assign({}, record), { last_modified: undefined, _status: "created" }));
+ }
+ });
+ });
+ this._lastModified = null;
+ await this.db.saveLastModified(null);
+ return unsynced.data.length;
+ }
+ /**
+ * Returns an object containing two lists:
+ *
+ * - `toDelete`: unsynced deleted records we can safely delete;
+ * - `toSync`: local updates to send to the server.
+ *
+ * @return {Promise}
+ */
+ async gatherLocalChanges() {
+ const unsynced = await this.list({
+ filters: { _status: ["created", "updated"] },
+ order: "",
+ });
+ const deleted = await this.list({ filters: { _status: "deleted" }, order: "" }, { includeDeleted: true });
+ return await Promise.all(unsynced.data
+ .concat(deleted.data)
+ .map(this._encodeRecord.bind(this, "remote")));
+ }
+ /**
+ * Fetch remote changes, import them to the local database, and handle
+ * conflicts according to `options.strategy`. Then, updates the passed
+ * {@link SyncResultObject} with import results.
+ *
+ * Options:
+ * - {String} strategy: The selected sync strategy.
+ * - {String} expectedTimestamp: A timestamp to use as a "cache busting" query parameter.
+ * - {Array<String>} exclude: A list of record ids to exclude from pull.
+ * - {Object} headers: The HTTP headers to use in the request.
+ * - {int} retry: The number of retries to do if the HTTP request fails.
+ * - {int} lastModified: The timestamp to use in `?_since` query.
+ *
+ * @param {KintoClient.Collection} client Kinto client Collection instance.
+ * @param {SyncResultObject} syncResultObject The sync result object.
+ * @param {Object} options The options object.
+ * @return {Promise}
+ */
+ async pullChanges(client, syncResultObject, options = {}) {
+ if (!syncResultObject.ok) {
+ return syncResultObject;
+ }
+ const since = this.lastModified
+ ? this.lastModified
+ : await this.db.getLastModified();
+ options = Object.assign({ strategy: Collection.strategy.MANUAL, lastModified: since, headers: {} }, options);
+ // Optionally ignore some records when pulling for changes.
+ // (avoid redownloading our own changes on last step of #sync())
+ let filters;
+ if (options.exclude) {
+ // Limit the list of excluded records to the first 50 records in order
+ // to remain under de-facto URL size limit (~2000 chars).
+ // http://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers/417184#417184
+ const exclude_id = options.exclude
+ .slice(0, 50)
+ .map(r => r.id)
+ .join(",");
+ filters = { exclude_id };
+ }
+ if (options.expectedTimestamp) {
+ filters = Object.assign(Object.assign({}, filters), { _expected: options.expectedTimestamp });
+ }
+ // First fetch remote changes from the server
+ const { data, last_modified } = await client.listRecords({
+ // Since should be ETag (see https://github.com/Kinto/kinto.js/issues/356)
+ since: options.lastModified ? `${options.lastModified}` : undefined,
+ headers: options.headers,
+ retry: options.retry,
+ // Fetch every page by default (FIXME: option to limit pages, see #277)
+ pages: Infinity,
+ filters,
+ });
+ // last_modified is the ETag header value (string).
+ // For retro-compatibility with first kinto.js versions
+ // parse it to integer.
+ const unquoted = last_modified ? parseInt(last_modified, 10) : undefined;
+ // Check if server was flushed.
+ // This is relevant for the Kinto demo server
+ // (and thus for many new comers).
+ const localSynced = options.lastModified;
+ const serverChanged = unquoted > options.lastModified;
+ const emptyCollection = data.length === 0;
+ if (!options.exclude && localSynced && serverChanged && emptyCollection) {
+ const e = new ServerWasFlushedError(localSynced, unquoted, "Server has been flushed. Client Side Timestamp: " +
+ localSynced +
+ " Server Side Timestamp: " +
+ unquoted);
+ throw e;
+ }
+ // Atomic updates are not sensible here because unquoted is not
+ // computed as a function of syncResultObject.lastModified.
+ // eslint-disable-next-line require-atomic-updates
+ syncResultObject.lastModified = unquoted;
+ // Decode incoming changes.
+ const decodedChanges = await Promise.all(data.map(change => {
+ return this._decodeRecord("remote", change);
+ }));
+ // Hook receives decoded records.
+ const payload = { lastModified: unquoted, changes: decodedChanges };
+ const afterHooks = await this.applyHook("incoming-changes", payload);
+ // No change, nothing to import.
+ if (afterHooks.changes.length > 0) {
+ // Reflect these changes locally
+ await this.importChanges(syncResultObject, afterHooks.changes, options.strategy);
+ }
+ return syncResultObject;
+ }
+ applyHook(hookName, payload) {
+ if (typeof this.hooks[hookName] == "undefined") {
+ return Promise.resolve(payload);
+ }
+ return waterfall(this.hooks[hookName].map(hook => {
+ return record => {
+ const result = hook(payload, this);
+ const resultThenable = result && typeof result.then === "function";
+ const resultChanges = result && Object.prototype.hasOwnProperty.call(result, "changes");
+ if (!(resultThenable || resultChanges)) {
+ throw new Error(`Invalid return value for hook: ${JSON.stringify(result)} has no 'then()' or 'changes' properties`);
+ }
+ return result;
+ };
+ }), payload);
+ }
+ /**
+ * Publish local changes to the remote server and updates the passed
+ * {@link SyncResultObject} with publication results.
+ *
+ * Options:
+ * - {String} strategy: The selected sync strategy.
+ * - {Object} headers: The HTTP headers to use in the request.
+ * - {int} retry: The number of retries to do if the HTTP request fails.
+ *
+ * @param {KintoClient.Collection} client Kinto client Collection instance.
+ * @param {SyncResultObject} syncResultObject The sync result object.
+ * @param {Object} changes The change object.
+ * @param {Array} changes.toDelete The list of records to delete.
+ * @param {Array} changes.toSync The list of records to create/update.
+ * @param {Object} options The options object.
+ * @return {Promise}
+ */
+ async pushChanges(client, changes, syncResultObject, options = {}) {
+ if (!syncResultObject.ok) {
+ return syncResultObject;
+ }
+ const safe = !options.strategy || options.strategy !== Collection.CLIENT_WINS;
+ const toDelete = changes.filter(r => r._status == "deleted");
+ const toSync = changes.filter(r => r._status != "deleted");
+ // Perform a batch request with every changes.
+ const synced = await client.batch(batch => {
+ toDelete.forEach(r => {
+ // never published locally deleted records should not be pusblished
+ if (r.last_modified) {
+ batch.deleteRecord(r);
+ }
+ });
+ toSync.forEach(r => {
+ // Clean local fields (like _status) before sending to server.
+ const published = this.cleanLocalFields(r);
+ if (r._status === "created") {
+ batch.createRecord(published);
+ }
+ else {
+ batch.updateRecord(published);
+ }
+ });
+ }, {
+ headers: options.headers,
+ retry: options.retry,
+ safe,
+ aggregate: true,
+ });
+ // Store outgoing errors into sync result object
+ syncResultObject.add("errors", synced.errors.map(e => (Object.assign(Object.assign({}, e), { type: "outgoing" }))));
+ // Store outgoing conflicts into sync result object
+ const conflicts = [];
+ for (const { type, local, remote } of synced.conflicts) {
+ // Note: we ensure that local data are actually available, as they may
+ // be missing in the case of a published deletion.
+ const safeLocal = (local && local.data) || { id: remote.id };
+ const realLocal = await this._decodeRecord("remote", safeLocal);
+ // We can get "null" from the remote side if we got a conflict
+ // and there is no remote version available; see kinto-http.js
+ // batch.js:aggregate.
+ const realRemote = remote && (await this._decodeRecord("remote", remote));
+ const conflict = { type, local: realLocal, remote: realRemote };
+ conflicts.push(conflict);
+ }
+ syncResultObject.add("conflicts", conflicts);
+ // Records that must be deleted are either deletions that were pushed
+ // to server (published) or deleted records that were never pushed (skipped).
+ const missingRemotely = synced.skipped.map(r => (Object.assign(Object.assign({}, r), { deleted: true })));
+ // For created and updated records, the last_modified coming from server
+ // will be stored locally.
+ // Reflect publication results locally using the response from
+ // the batch request.
+ const published = synced.published.map(c => c.data);
+ const toApplyLocally = published.concat(missingRemotely);
+ // Apply the decode transformers, if any
+ const decoded = await Promise.all(toApplyLocally.map(record => {
+ return this._decodeRecord("remote", record);
+ }));
+ // We have to update the local records with the responses of the server
+ // (eg. last_modified values etc.).
+ if (decoded.length > 0 || conflicts.length > 0) {
+ await this._applyPushedResults(syncResultObject, decoded, conflicts, options.strategy);
+ }
+ return syncResultObject;
+ }
+ /**
+ * Return a copy of the specified record without the local fields.
+ *
+ * @param {Object} record A record with potential local fields.
+ * @return {Object}
+ */
+ cleanLocalFields(record) {
+ const localKeys = RECORD_FIELDS_TO_CLEAN.concat(this.localFields);
+ return omitKeys(record, localKeys);
+ }
+ /**
+ * Resolves a conflict, updating local record according to proposed
+ * resolution — keeping remote record `last_modified` value as a reference for
+ * further batch sending.
+ *
+ * @param {Object} conflict The conflict object.
+ * @param {Object} resolution The proposed record.
+ * @return {Promise}
+ */
+ resolve(conflict, resolution) {
+ return this.db.execute(transaction => {
+ const updated = this._resolveRaw(conflict, resolution);
+ transaction.update(updated);
+ return { data: updated, permissions: {} };
+ });
+ }
+ /**
+ * @private
+ */
+ _resolveRaw(conflict, resolution) {
+ const resolved = Object.assign(Object.assign({}, resolution), {
+ // Ensure local record has the latest authoritative timestamp
+ last_modified: conflict.remote && conflict.remote.last_modified });
+ // If the resolution object is strictly equal to the
+ // remote record, then we can mark it as synced locally.
+ // Otherwise, mark it as updated (so that the resolution is pushed).
+ const synced = deepEqual(resolved, conflict.remote);
+ return markStatus(resolved, synced ? "synced" : "updated");
+ }
+ /**
+ * Synchronize remote and local data. The promise will resolve with a
+ * {@link SyncResultObject}, though will reject:
+ *
+ * - if the server is currently backed off;
+ * - if the server has been detected flushed.
+ *
+ * Options:
+ * - {Object} headers: HTTP headers to attach to outgoing requests.
+ * - {String} expectedTimestamp: A timestamp to use as a "cache busting" query parameter.
+ * - {Number} retry: Number of retries when server fails to process the request (default: 1).
+ * - {Collection.strategy} strategy: See {@link Collection.strategy}.
+ * - {Boolean} ignoreBackoff: Force synchronization even if server is currently
+ * backed off.
+ * - {String} bucket: The remove bucket id to use (default: null)
+ * - {String} collection: The remove collection id to use (default: null)
+ * - {String} remote The remote Kinto server endpoint to use (default: null).
+ *
+ * @param {Object} options Options.
+ * @return {Promise}
+ * @throws {Error} If an invalid remote option is passed.
+ */
+ async sync(options = {
+ strategy: Collection.strategy.MANUAL,
+ headers: {},
+ retry: 1,
+ ignoreBackoff: false,
+ bucket: null,
+ collection: null,
+ remote: null,
+ expectedTimestamp: null,
+ }) {
+ options = Object.assign(Object.assign({}, options), { bucket: options.bucket || this.bucket, collection: options.collection || this.name });
+ const previousRemote = this.api.remote;
+ if (options.remote) {
+ // Note: setting the remote ensures it's valid, throws when invalid.
+ this.api.remote = options.remote;
+ }
+ if (!options.ignoreBackoff && this.api.backoff > 0) {
+ const seconds = Math.ceil(this.api.backoff / 1000);
+ return Promise.reject(new Error(`Server is asking clients to back off; retry in ${seconds}s or use the ignoreBackoff option.`));
+ }
+ const client = this.api
+ .bucket(options.bucket)
+ .collection(options.collection);
+ const result = new SyncResultObject();
+ try {
+ // Fetch collection metadata.
+ await this.pullMetadata(client, options);
+ // Fetch last changes from the server.
+ await this.pullChanges(client, result, options);
+ const { lastModified } = result;
+ if (options.strategy != Collection.strategy.PULL_ONLY) {
+ // Fetch local changes
+ const toSync = await this.gatherLocalChanges();
+ // Publish local changes and pull local resolutions
+ await this.pushChanges(client, toSync, result, options);
+ // Publish local resolution of push conflicts to server (on CLIENT_WINS)
+ const resolvedUnsynced = result.resolved.filter(r => r._status !== "synced");
+ if (resolvedUnsynced.length > 0) {
+ const resolvedEncoded = await Promise.all(resolvedUnsynced.map(resolution => {
+ let record = resolution.accepted;
+ if (record === null) {
+ record = { id: resolution.id, _status: resolution._status };
+ }
+ return this._encodeRecord("remote", record);
+ }));
+ await this.pushChanges(client, resolvedEncoded, result, options);
+ }
+ // Perform a last pull to catch changes that occured after the last pull,
+ // while local changes were pushed. Do not do it nothing was pushed.
+ if (result.published.length > 0) {
+ // Avoid redownloading our own changes during the last pull.
+ const pullOpts = Object.assign(Object.assign({}, options), { lastModified, exclude: result.published });
+ await this.pullChanges(client, result, pullOpts);
+ }
+ }
+ // Don't persist lastModified value if any conflict or error occured
+ if (result.ok) {
+ // No conflict occured, persist collection's lastModified value
+ this._lastModified = await this.db.saveLastModified(result.lastModified);
+ }
+ }
+ catch (e) {
+ this.events.emit("sync:error", Object.assign(Object.assign({}, options), { error: e }));
+ throw e;
+ }
+ finally {
+ // Ensure API default remote is reverted if a custom one's been used
+ this.api.remote = previousRemote;
+ }
+ this.events.emit("sync:success", Object.assign(Object.assign({}, options), { result }));
+ return result;
+ }
+ /**
+ * Load a list of records already synced with the remote server.
+ *
+ * The local records which are unsynced or whose timestamp is either missing
+ * or superior to those being loaded will be ignored.
+ *
+ * @deprecated Use {@link importBulk} instead.
+ * @param {Array} records The previously exported list of records to load.
+ * @return {Promise} with the effectively imported records.
+ */
+ async loadDump(records) {
+ return this.importBulk(records);
+ }
+ /**
+ * Load a list of records already synced with the remote server.
+ *
+ * The local records which are unsynced or whose timestamp is either missing
+ * or superior to those being loaded will be ignored.
+ *
+ * @param {Array} records The previously exported list of records to load.
+ * @return {Promise} with the effectively imported records.
+ */
+ async importBulk(records) {
+ if (!Array.isArray(records)) {
+ throw new Error("Records is not an array.");
+ }
+ for (const record of records) {
+ if (!Object.prototype.hasOwnProperty.call(record, "id") ||
+ !this.idSchema.validate(record.id)) {
+ throw new Error("Record has invalid ID: " + JSON.stringify(record));
+ }
+ if (!record.last_modified) {
+ throw new Error("Record has no last_modified value: " + JSON.stringify(record));
+ }
+ }
+ // Fetch all existing records from local database,
+ // and skip those who are newer or not marked as synced.
+ // XXX filter by status / ids in records
+ const { data } = await this.list({}, { includeDeleted: true });
+ const existingById = data.reduce((acc, record) => {
+ acc[record.id] = record;
+ return acc;
+ }, {});
+ const newRecords = records.filter(record => {
+ const localRecord = existingById[record.id];
+ const shouldKeep =
+ // No local record with this id.
+ localRecord === undefined ||
+ // Or local record is synced
+ (localRecord._status === "synced" &&
+ // And was synced from server
+ localRecord.last_modified !== undefined &&
+ // And is older than imported one.
+ record.last_modified > localRecord.last_modified);
+ return shouldKeep;
+ });
+ return await this.db.importBulk(newRecords.map(markSynced));
+ }
+ async pullMetadata(client, options = {}) {
+ const { expectedTimestamp, headers } = options;
+ const query = expectedTimestamp
+ ? { query: { _expected: expectedTimestamp } }
+ : undefined;
+ const metadata = await client.getData(Object.assign(Object.assign({}, query), { headers }));
+ return this.db.saveMetadata(metadata);
+ }
+ async metadata() {
+ return this.db.getMetadata();
+ }
+ }
+ /**
+ * A Collection-oriented wrapper for an adapter's transaction.
+ *
+ * This defines the high-level functions available on a collection.
+ * The collection itself offers functions of the same name. These will
+ * perform just one operation in its own transaction.
+ */
+ class CollectionTransaction {
+ constructor(collection, adapterTransaction) {
+ this.collection = collection;
+ this.adapterTransaction = adapterTransaction;
+ this._events = [];
+ }
+ _queueEvent(action, payload) {
+ this._events.push({ action, payload });
+ }
+ /**
+ * Emit queued events, to be called once every transaction operations have
+ * been executed successfully.
+ */
+ emitEvents() {
+ for (const { action, payload } of this._events) {
+ this.collection.events.emit(action, payload);
+ }
+ if (this._events.length > 0) {
+ const targets = this._events.map(({ action, payload }) => (Object.assign({ action }, payload)));
+ this.collection.events.emit("change", { targets });
+ }
+ this._events = [];
+ }
+ /**
+ * Retrieve a record by its id from the local database, or
+ * undefined if none exists.
+ *
+ * This will also return virtually deleted records.
+ *
+ * @param {String} id
+ * @return {Object}
+ */
+ getAny(id) {
+ const record = this.adapterTransaction.get(id);
+ return { data: record, permissions: {} };
+ }
+ /**
+ * Retrieve a record by its id from the local database.
+ *
+ * Options:
+ * - {Boolean} includeDeleted: Include virtually deleted records.
+ *
+ * @param {String} id
+ * @param {Object} options
+ * @return {Object}
+ */
+ get(id, options = { includeDeleted: false }) {
+ const res = this.getAny(id);
+ if (!res.data ||
+ (!options.includeDeleted && res.data._status === "deleted")) {
+ throw new Error(`Record with id=${id} not found.`);
+ }
+ return res;
+ }
+ /**
+ * Deletes a record from the local database.
+ *
+ * Options:
+ * - {Boolean} virtual: When set to `true`, doesn't actually delete the record,
+ * update its `_status` attribute to `deleted` instead (default: true)
+ *
+ * @param {String} id The record's Id.
+ * @param {Object} options The options object.
+ * @return {Object}
+ */
+ delete(id, options = { virtual: true }) {
+ // Ensure the record actually exists.
+ const existing = this.adapterTransaction.get(id);
+ const alreadyDeleted = existing && existing._status == "deleted";
+ if (!existing || (alreadyDeleted && options.virtual)) {
+ throw new Error(`Record with id=${id} not found.`);
+ }
+ // Virtual updates status.
+ if (options.virtual) {
+ this.adapterTransaction.update(markDeleted(existing));
+ }
+ else {
+ // Delete for real.
+ this.adapterTransaction.delete(id);
+ }
+ this._queueEvent("delete", { data: existing });
+ return { data: existing, permissions: {} };
+ }
+ /**
+ * Soft delete all records from the local database.
+ *
+ * @param {Array} ids Array of non-deleted Record Ids.
+ * @return {Object}
+ */
+ deleteAll(ids) {
+ const existingRecords = [];
+ ids.forEach(id => {
+ existingRecords.push(this.adapterTransaction.get(id));
+ this.delete(id);
+ });
+ this._queueEvent("deleteAll", { data: existingRecords });
+ return { data: existingRecords, permissions: {} };
+ }
+ /**
+ * Deletes a record from the local database, if any exists.
+ * Otherwise, do nothing.
+ *
+ * @param {String} id The record's Id.
+ * @return {Object}
+ */
+ deleteAny(id) {
+ const existing = this.adapterTransaction.get(id);
+ if (existing) {
+ this.adapterTransaction.update(markDeleted(existing));
+ this._queueEvent("delete", { data: existing });
+ }
+ return { data: Object.assign({ id }, existing), deleted: !!existing, permissions: {} };
+ }
+ /**
+ * Adds a record to the local database, asserting that none
+ * already exist with this ID.
+ *
+ * @param {Object} record, which must contain an ID
+ * @return {Object}
+ */
+ create(record) {
+ if (typeof record !== "object") {
+ throw new Error("Record is not an object.");
+ }
+ if (!Object.prototype.hasOwnProperty.call(record, "id")) {
+ throw new Error("Cannot create a record missing id");
+ }
+ if (!this.collection.idSchema.validate(record.id)) {
+ throw new Error(`Invalid Id: ${record.id}`);
+ }
+ this.adapterTransaction.create(record);
+ this._queueEvent("create", { data: record });
+ return { data: record, permissions: {} };
+ }
+ /**
+ * Updates a record from the local database.
+ *
+ * Options:
+ * - {Boolean} synced: Sets record status to "synced" (default: false)
+ * - {Boolean} patch: Extends the existing record instead of overwriting it
+ * (default: false)
+ *
+ * @param {Object} record
+ * @param {Object} options
+ * @return {Object}
+ */
+ update(record, options = { synced: false, patch: false }) {
+ if (typeof record !== "object") {
+ throw new Error("Record is not an object.");
+ }
+ if (!Object.prototype.hasOwnProperty.call(record, "id")) {
+ throw new Error("Cannot update a record missing id.");
+ }
+ if (!this.collection.idSchema.validate(record.id)) {
+ throw new Error(`Invalid Id: ${record.id}`);
+ }
+ const oldRecord = this.adapterTransaction.get(record.id);
+ if (!oldRecord) {
+ throw new Error(`Record with id=${record.id} not found.`);
+ }
+ const newRecord = options.patch ? Object.assign(Object.assign({}, oldRecord), record) : record;
+ const updated = this._updateRaw(oldRecord, newRecord, options);
+ this.adapterTransaction.update(updated);
+ this._queueEvent("update", { data: updated, oldRecord });
+ return { data: updated, oldRecord, permissions: {} };
+ }
+ /**
+ * Lower-level primitive for updating a record while respecting
+ * _status and last_modified.
+ *
+ * @param {Object} oldRecord: the record retrieved from the DB
+ * @param {Object} newRecord: the record to replace it with
+ * @return {Object}
+ */
+ _updateRaw(oldRecord, newRecord, { synced = false } = {}) {
+ const updated = Object.assign({}, newRecord);
+ // Make sure to never loose the existing timestamp.
+ if (oldRecord && oldRecord.last_modified && !updated.last_modified) {
+ updated.last_modified = oldRecord.last_modified;
+ }
+ // If only local fields have changed, then keep record as synced.
+ // If status is created, keep record as created.
+ // If status is deleted, mark as updated.
+ const isIdentical = oldRecord &&
+ recordsEqual(oldRecord, updated, this.collection.localFields);
+ const keepSynced = isIdentical && oldRecord._status == "synced";
+ const neverSynced = !oldRecord || (oldRecord && oldRecord._status == "created");
+ const newStatus = keepSynced || synced ? "synced" : neverSynced ? "created" : "updated";
+ return markStatus(updated, newStatus);
+ }
+ /**
+ * Upsert a record into the local database.
+ *
+ * This record must have an ID.
+ *
+ * If a record with this ID already exists, it will be replaced.
+ * Otherwise, this record will be inserted.
+ *
+ * @param {Object} record
+ * @return {Object}
+ */
+ upsert(record) {
+ if (typeof record !== "object") {
+ throw new Error("Record is not an object.");
+ }
+ if (!Object.prototype.hasOwnProperty.call(record, "id")) {
+ throw new Error("Cannot update a record missing id.");
+ }
+ if (!this.collection.idSchema.validate(record.id)) {
+ throw new Error(`Invalid Id: ${record.id}`);
+ }
+ let oldRecord = this.adapterTransaction.get(record.id);
+ const updated = this._updateRaw(oldRecord, record);
+ this.adapterTransaction.update(updated);
+ // Don't return deleted records -- pretend they are gone
+ if (oldRecord && oldRecord._status == "deleted") {
+ oldRecord = undefined;
+ }
+ if (oldRecord) {
+ this._queueEvent("update", { data: updated, oldRecord });
+ }
+ else {
+ this._queueEvent("create", { data: updated });
+ }
+ return { data: updated, oldRecord, permissions: {} };
+ }
+ }
+
+ const DEFAULT_BUCKET_NAME = "default";
+ const DEFAULT_REMOTE = "http://localhost:8888/v1";
+ const DEFAULT_RETRY = 1;
+ /**
+ * KintoBase class.
+ */
+ class KintoBase {
+ /**
+ * Provides a public access to the base adapter class. Users can create a
+ * custom DB adapter by extending {@link BaseAdapter}.
+ *
+ * @type {Object}
+ */
+ static get adapters() {
+ return {
+ BaseAdapter: BaseAdapter,
+ };
+ }
+ /**
+ * Synchronization strategies. Available strategies are:
+ *
+ * - `MANUAL`: Conflicts will be reported in a dedicated array.
+ * - `SERVER_WINS`: Conflicts are resolved using remote data.
+ * - `CLIENT_WINS`: Conflicts are resolved using local data.
+ *
+ * @type {Object}
+ */
+ static get syncStrategy() {
+ return Collection.strategy;
+ }
+ /**
+ * Constructor.
+ *
+ * Options:
+ * - `{String}` `remote` The server URL to use.
+ * - `{String}` `bucket` The collection bucket name.
+ * - `{EventEmitter}` `events` Events handler.
+ * - `{BaseAdapter}` `adapter` The base DB adapter class.
+ * - `{Object}` `adapterOptions` Options given to the adapter.
+ * - `{Object}` `headers` The HTTP headers to use.
+ * - `{Object}` `retry` Number of retries when the server fails to process the request (default: `1`)
+ * - `{String}` `requestMode` The HTTP CORS mode to use.
+ * - `{Number}` `timeout` The requests timeout in ms (default: `5000`).
+ *
+ * @param {Object} options The options object.
+ */
+ constructor(options = {}) {
+ const defaults = {
+ bucket: DEFAULT_BUCKET_NAME,
+ remote: DEFAULT_REMOTE,
+ retry: DEFAULT_RETRY,
+ };
+ this._options = Object.assign(Object.assign({}, defaults), options);
+ if (!this._options.adapter) {
+ throw new Error("No adapter provided");
+ }
+ this._api = null;
+ /**
+ * The event emitter instance.
+ * @type {EventEmitter}
+ */
+ this.events = this._options.events;
+ }
+ /**
+ * The kinto HTTP client instance.
+ * @type {KintoClient}
+ */
+ get api() {
+ const { events, headers, remote, requestMode, retry, timeout, } = this._options;
+ if (!this._api) {
+ this._api = new this.ApiClass(remote, {
+ events,
+ headers,
+ requestMode,
+ retry,
+ timeout,
+ });
+ }
+ return this._api;
+ }
+ /**
+ * Creates a {@link Collection} instance. The second (optional) parameter
+ * will set collection-level options like e.g. `remoteTransformers`.
+ *
+ * @param {String} collName The collection name.
+ * @param {Object} [options={}] Extra options or override client's options.
+ * @param {Object} [options.idSchema] IdSchema instance (default: UUID)
+ * @param {Object} [options.remoteTransformers] Array<RemoteTransformer> (default: `[]`])
+ * @param {Object} [options.hooks] Array<Hook> (default: `[]`])
+ * @param {Object} [options.localFields] Array<Field> (default: `[]`])
+ * @return {Collection}
+ */
+ collection(collName, options = {}) {
+ if (!collName) {
+ throw new Error("missing collection name");
+ }
+ const { bucket, events, adapter, adapterOptions } = Object.assign(Object.assign({}, this._options), options);
+ const { idSchema, remoteTransformers, hooks, localFields } = options;
+ return new Collection(bucket, collName, this, {
+ events,
+ adapter,
+ adapterOptions,
+ idSchema,
+ remoteTransformers,
+ hooks,
+ localFields,
+ });
+ }
+ }
+
+ /*
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ const { setTimeout, clearTimeout } = ChromeUtils.importESModule("resource://gre/modules/Timer.sys.mjs");
+ const { XPCOMUtils } = ChromeUtils.importESModule("resource://gre/modules/XPCOMUtils.sys.mjs");
+ XPCOMUtils.defineLazyGlobalGetters(global, ["fetch", "indexedDB"]);
+ ChromeUtils.defineESModuleGetters(global, {
+ EventEmitter: "resource://gre/modules/EventEmitter.sys.mjs"
+ });
+ // Use standalone kinto-http module landed in FFx.
+ ChromeUtils.defineModuleGetter(global, "KintoHttpClient", "resource://services-common/kinto-http-client.js");
+ XPCOMUtils.defineLazyGetter(global, "generateUUID", () => {
+ const { generateUUID } = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator);
+ return generateUUID;
+ });
+ class Kinto extends KintoBase {
+ static get adapters() {
+ return {
+ BaseAdapter,
+ IDB,
+ };
+ }
+ get ApiClass() {
+ return KintoHttpClient;
+ }
+ constructor(options = {}) {
+ const events = {};
+ EventEmitter.decorate(events);
+ const defaults = {
+ adapter: IDB,
+ events,
+ };
+ super(Object.assign(Object.assign({}, defaults), options));
+ }
+ collection(collName, options = {}) {
+ const idSchema = {
+ validate(id) {
+ return typeof id == "string" && RE_RECORD_ID.test(id);
+ },
+ generate() {
+ return generateUUID()
+ .toString()
+ .replace(/[{}]/g, "");
+ },
+ };
+ return super.collection(collName, Object.assign({ idSchema }, options));
+ }
+ }
+
+ return Kinto;
+
+})));