@openziti/ziti-browzer-sw
Version:
Service Worker used as part of the OpenZiti browZer stack
497 lines (487 loc) • 21 kB
JavaScript
define(['exports', './ziti-browzer-sw-workbox-core-56411b90', './ziti-browzer-sw-misc-7bbd97fe'], (function (exports, zitiBrowzerSwWorkboxCore, zitiBrowzerSwMisc) { 'use strict';
// @ts-ignore
try {
self['workbox:expiration:6.6.0'] && _();
}
catch (e) { }
/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
const DB_NAME = 'workbox-expiration';
const CACHE_OBJECT_STORE = 'cache-entries';
const normalizeURL = (unNormalizedUrl) => {
const url = new URL(unNormalizedUrl, location.href);
url.hash = '';
return url.href;
};
/**
* Returns the timestamp model.
*
* @private
*/
class CacheTimestampsModel {
/**
*
* @param {string} cacheName
*
* @private
*/
constructor(cacheName) {
this._db = null;
this._cacheName = cacheName;
}
/**
* Performs an upgrade of indexedDB.
*
* @param {IDBPDatabase<CacheDbSchema>} db
*
* @private
*/
_upgradeDb(db) {
// TODO(philipwalton): EdgeHTML doesn't support arrays as a keyPath, so we
// have to use the `id` keyPath here and create our own values (a
// concatenation of `url + cacheName`) instead of simply using
// `keyPath: ['url', 'cacheName']`, which is supported in other browsers.
const objStore = db.createObjectStore(CACHE_OBJECT_STORE, { keyPath: 'id' });
// TODO(philipwalton): once we don't have to support EdgeHTML, we can
// create a single index with the keyPath `['cacheName', 'timestamp']`
// instead of doing both these indexes.
objStore.createIndex('cacheName', 'cacheName', { unique: false });
objStore.createIndex('timestamp', 'timestamp', { unique: false });
}
/**
* Performs an upgrade of indexedDB and deletes deprecated DBs.
*
* @param {IDBPDatabase<CacheDbSchema>} db
*
* @private
*/
_upgradeDbAndDeleteOldDbs(db) {
this._upgradeDb(db);
if (this._cacheName) {
void zitiBrowzerSwMisc.deleteDB(this._cacheName);
}
}
/**
* @param {string} url
* @param {number} timestamp
*
* @private
*/
async setTimestamp(url, timestamp) {
url = normalizeURL(url);
const entry = {
url,
timestamp,
cacheName: this._cacheName,
// Creating an ID from the URL and cache name won't be necessary once
// Edge switches to Chromium and all browsers we support work with
// array keyPaths.
id: this._getId(url),
};
const db = await this.getDb();
const tx = db.transaction(CACHE_OBJECT_STORE, 'readwrite', {
durability: 'relaxed',
});
await tx.store.put(entry);
await tx.done;
}
/**
* Returns the timestamp stored for a given URL.
*
* @param {string} url
* @return {number | undefined}
*
* @private
*/
async getTimestamp(url) {
const db = await this.getDb();
const entry = await db.get(CACHE_OBJECT_STORE, this._getId(url));
return entry === null || entry === void 0 ? void 0 : entry.timestamp;
}
/**
* Iterates through all the entries in the object store (from newest to
* oldest) and removes entries once either `maxCount` is reached or the
* entry's timestamp is less than `minTimestamp`.
*
* @param {number} minTimestamp
* @param {number} maxCount
* @return {Array<string>}
*
* @private
*/
async expireEntries(minTimestamp, maxCount) {
const db = await this.getDb();
let cursor = await db
.transaction(CACHE_OBJECT_STORE)
.store.index('timestamp')
.openCursor(null, 'prev');
const entriesToDelete = [];
let entriesNotDeletedCount = 0;
while (cursor) {
const result = cursor.value;
// TODO(philipwalton): once we can use a multi-key index, we
// won't have to check `cacheName` here.
if (result.cacheName === this._cacheName) {
// Delete an entry if it's older than the max age or
// if we already have the max number allowed.
if ((minTimestamp && result.timestamp < minTimestamp) ||
(maxCount && entriesNotDeletedCount >= maxCount)) {
// TODO(philipwalton): we should be able to delete the
// entry right here, but doing so causes an iteration
// bug in Safari stable (fixed in TP). Instead we can
// store the keys of the entries to delete, and then
// delete the separate transactions.
// https://github.com/GoogleChrome/workbox/issues/1978
// cursor.delete();
// We only need to return the URL, not the whole entry.
entriesToDelete.push(cursor.value);
}
else {
entriesNotDeletedCount++;
}
}
cursor = await cursor.continue();
}
// TODO(philipwalton): once the Safari bug in the following issue is fixed,
// we should be able to remove this loop and do the entry deletion in the
// cursor loop above:
// https://github.com/GoogleChrome/workbox/issues/1978
const urlsDeleted = [];
for (const entry of entriesToDelete) {
await db.delete(CACHE_OBJECT_STORE, entry.id);
urlsDeleted.push(entry.url);
}
return urlsDeleted;
}
/**
* Takes a URL and returns an ID that will be unique in the object store.
*
* @param {string} url
* @return {string}
*
* @private
*/
_getId(url) {
// Creating an ID from the URL and cache name won't be necessary once
// Edge switches to Chromium and all browsers we support work with
// array keyPaths.
return this._cacheName + '|' + normalizeURL(url);
}
/**
* Returns an open connection to the database.
*
* @private
*/
async getDb() {
if (!this._db) {
this._db = await zitiBrowzerSwMisc.openDB(DB_NAME, 1, {
upgrade: this._upgradeDbAndDeleteOldDbs.bind(this),
});
}
return this._db;
}
}
/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
/**
* The `CacheExpiration` class allows you define an expiration and / or
* limit on the number of responses stored in a
* [`Cache`](https://developer.mozilla.org/en-US/docs/Web/API/Cache).
*
* @memberof workbox-expiration
*/
class CacheExpiration {
/**
* To construct a new CacheExpiration instance you must provide at least
* one of the `config` properties.
*
* @param {string} cacheName Name of the cache to apply restrictions to.
* @param {Object} config
* @param {number} [config.maxEntries] The maximum number of entries to cache.
* Entries used the least will be removed as the maximum is reached.
* @param {number} [config.maxAgeSeconds] The maximum age of an entry before
* it's treated as stale and removed.
* @param {Object} [config.matchOptions] The [`CacheQueryOptions`](https://developer.mozilla.org/en-US/docs/Web/API/Cache/delete#Parameters)
* that will be used when calling `delete()` on the cache.
*/
constructor(cacheName, config = {}) {
this._isRunning = false;
this._rerunRequested = false;
this._maxEntries = config.maxEntries;
this._maxAgeSeconds = config.maxAgeSeconds;
this._matchOptions = config.matchOptions;
this._cacheName = cacheName;
this._timestampModel = new CacheTimestampsModel(cacheName);
}
/**
* Expires entries for the given cache and given criteria.
*/
async expireEntries() {
if (this._isRunning) {
this._rerunRequested = true;
return;
}
this._isRunning = true;
const minTimestamp = this._maxAgeSeconds
? Date.now() - this._maxAgeSeconds * 1000
: 0;
const urlsExpired = await this._timestampModel.expireEntries(minTimestamp, this._maxEntries);
// Delete URLs from the cache
const cache = await self.caches.open(this._cacheName);
for (const url of urlsExpired) {
await cache.delete(url, this._matchOptions);
}
this._isRunning = false;
if (this._rerunRequested) {
this._rerunRequested = false;
zitiBrowzerSwWorkboxCore.dontWaitFor(this.expireEntries());
}
}
/**
* Update the timestamp for the given URL. This ensures the when
* removing entries based on maximum entries, most recently used
* is accurate or when expiring, the timestamp is up-to-date.
*
* @param {string} url
*/
async updateTimestamp(url) {
await this._timestampModel.setTimestamp(url, Date.now());
}
/**
* Can be used to check if a URL has expired or not before it's used.
*
* This requires a look up from IndexedDB, so can be slow.
*
* Note: This method will not remove the cached entry, call
* `expireEntries()` to remove indexedDB and Cache entries.
*
* @param {string} url
* @return {boolean}
*/
async isURLExpired(url) {
if (!this._maxAgeSeconds) {
return false;
}
else {
const timestamp = await this._timestampModel.getTimestamp(url);
const expireOlderThan = Date.now() - this._maxAgeSeconds * 1000;
return timestamp !== undefined ? timestamp < expireOlderThan : true;
}
}
/**
* Removes the IndexedDB object store used to keep track of cache expiration
* metadata.
*/
async delete() {
// Make sure we don't attempt another rerun if we're called in the middle of
// a cache expiration.
this._rerunRequested = false;
await this._timestampModel.expireEntries(Infinity); // Expires all.
}
}
/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
/**
* This plugin can be used in a `workbox-strategy` to regularly enforce a
* limit on the age and / or the number of cached requests.
*
* It can only be used with `workbox-strategy` instances that have a
* [custom `cacheName` property set](/web/tools/workbox/guides/configure-workbox#custom_cache_names_in_strategies).
* In other words, it can't be used to expire entries in strategy that uses the
* default runtime cache name.
*
* Whenever a cached response is used or updated, this plugin will look
* at the associated cache and remove any old or extra responses.
*
* When using `maxAgeSeconds`, responses may be used *once* after expiring
* because the expiration clean up will not have occurred until *after* the
* cached response has been used. If the response has a "Date" header, then
* a light weight expiration check is performed and the response will not be
* used immediately.
*
* When using `maxEntries`, the entry least-recently requested will be removed
* from the cache first.
*
* @memberof workbox-expiration
*/
class ExpirationPlugin {
/**
* @param {ExpirationPluginOptions} config
* @param {number} [config.maxEntries] The maximum number of entries to cache.
* Entries used the least will be removed as the maximum is reached.
* @param {number} [config.maxAgeSeconds] The maximum age of an entry before
* it's treated as stale and removed.
* @param {Object} [config.matchOptions] The [`CacheQueryOptions`](https://developer.mozilla.org/en-US/docs/Web/API/Cache/delete#Parameters)
* that will be used when calling `delete()` on the cache.
* @param {boolean} [config.purgeOnQuotaError] Whether to opt this cache in to
* automatic deletion if the available storage quota has been exceeded.
*/
constructor(config = {}) {
/**
* A "lifecycle" callback that will be triggered automatically by the
* `workbox-strategies` handlers when a `Response` is about to be returned
* from a [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache) to
* the handler. It allows the `Response` to be inspected for freshness and
* prevents it from being used if the `Response`'s `Date` header value is
* older than the configured `maxAgeSeconds`.
*
* @param {Object} options
* @param {string} options.cacheName Name of the cache the response is in.
* @param {Response} options.cachedResponse The `Response` object that's been
* read from a cache and whose freshness should be checked.
* @return {Response} Either the `cachedResponse`, if it's
* fresh, or `null` if the `Response` is older than `maxAgeSeconds`.
*
* @private
*/
this.cachedResponseWillBeUsed = async ({ event, request, cacheName, cachedResponse, }) => {
if (!cachedResponse) {
return null;
}
const isFresh = this._isResponseDateFresh(cachedResponse);
// Expire entries to ensure that even if the expiration date has
// expired, it'll only be used once.
const cacheExpiration = this._getCacheExpiration(cacheName);
zitiBrowzerSwWorkboxCore.dontWaitFor(cacheExpiration.expireEntries());
// Update the metadata for the request URL to the current timestamp,
// but don't `await` it as we don't want to block the response.
const updateTimestampDone = cacheExpiration.updateTimestamp(request.url);
if (event) {
try {
event.waitUntil(updateTimestampDone);
}
catch (error) {
}
}
return isFresh ? cachedResponse : null;
};
/**
* A "lifecycle" callback that will be triggered automatically by the
* `workbox-strategies` handlers when an entry is added to a cache.
*
* @param {Object} options
* @param {string} options.cacheName Name of the cache that was updated.
* @param {string} options.request The Request for the cached entry.
*
* @private
*/
this.cacheDidUpdate = async ({ cacheName, request, }) => {
const cacheExpiration = this._getCacheExpiration(cacheName);
await cacheExpiration.updateTimestamp(request.url);
await cacheExpiration.expireEntries();
};
this._config = config;
this._maxAgeSeconds = config.maxAgeSeconds;
this._cacheExpirations = new Map();
if (config.purgeOnQuotaError) {
zitiBrowzerSwWorkboxCore.registerQuotaErrorCallback(() => this.deleteCacheAndMetadata());
}
}
/**
* A simple helper method to return a CacheExpiration instance for a given
* cache name.
*
* @param {string} cacheName
* @return {CacheExpiration}
*
* @private
*/
_getCacheExpiration(cacheName) {
if (cacheName === zitiBrowzerSwWorkboxCore.cacheNames.getRuntimeName()) {
throw new zitiBrowzerSwWorkboxCore.WorkboxError('expire-custom-caches-only');
}
let cacheExpiration = this._cacheExpirations.get(cacheName);
if (!cacheExpiration) {
cacheExpiration = new CacheExpiration(cacheName, this._config);
this._cacheExpirations.set(cacheName, cacheExpiration);
}
return cacheExpiration;
}
/**
* @param {Response} cachedResponse
* @return {boolean}
*
* @private
*/
_isResponseDateFresh(cachedResponse) {
if (!this._maxAgeSeconds) {
// We aren't expiring by age, so return true, it's fresh
return true;
}
// Check if the 'date' header will suffice a quick expiration check.
// See https://github.com/GoogleChromeLabs/sw-toolbox/issues/164 for
// discussion.
const dateHeaderTimestamp = this._getDateHeaderTimestamp(cachedResponse);
if (dateHeaderTimestamp === null) {
// Unable to parse date, so assume it's fresh.
return true;
}
// If we have a valid headerTime, then our response is fresh iff the
// headerTime plus maxAgeSeconds is greater than the current time.
const now = Date.now();
return dateHeaderTimestamp >= now - this._maxAgeSeconds * 1000;
}
/**
* This method will extract the data header and parse it into a useful
* value.
*
* @param {Response} cachedResponse
* @return {number|null}
*
* @private
*/
_getDateHeaderTimestamp(cachedResponse) {
if (!cachedResponse.headers.has('date')) {
return null;
}
const dateHeader = cachedResponse.headers.get('date');
const parsedDate = new Date(dateHeader);
const headerTime = parsedDate.getTime();
// If the Date header was invalid for some reason, parsedDate.getTime()
// will return NaN.
if (isNaN(headerTime)) {
return null;
}
return headerTime;
}
/**
* This is a helper method that performs two operations:
*
* - Deletes *all* the underlying Cache instances associated with this plugin
* instance, by calling caches.delete() on your behalf.
* - Deletes the metadata from IndexedDB used to keep track of expiration
* details for each Cache instance.
*
* When using cache expiration, calling this method is preferable to calling
* `caches.delete()` directly, since this will ensure that the IndexedDB
* metadata is also cleanly removed and open IndexedDB instances are deleted.
*
* Note that if you're *not* using cache expiration for a given cache, calling
* `caches.delete()` and passing in the cache's name should be sufficient.
* There is no Workbox-specific method needed for cleanup in that case.
*/
async deleteCacheAndMetadata() {
// Do this one at a time instead of all at once via `Promise.all()` to
// reduce the chance of inconsistency if a promise rejects.
for (const [cacheName, cacheExpiration] of this._cacheExpirations) {
await self.caches.delete(cacheName);
await cacheExpiration.delete();
}
// Reset this._cacheExpirations to its initial state.
this._cacheExpirations = new Map();
}
}
exports.ExpirationPlugin = ExpirationPlugin;
}));