this.workbox = this.workbox || {};
this.workbox.expiration = (function (exports, assert_js, dontWaitFor_js, logger_js, WorkboxError_js, DBWrapper_js, deleteDatabase_js, cacheNames_js, getFriendlyURL_js, registerQuotaErrorCallback_js) {
'use strict';
try {
self['workbox:expiration:5.1.4'] && _();
} 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 OBJECT_STORE_NAME = '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._cacheName = cacheName;
this._db = new DBWrapper_js.DBWrapper(DB_NAME, 1, {
onupgradeneeded: event => this._handleUpgrade(event)
});
}
/**
* Should perform an upgrade of indexedDB.
*
* @param {Event} event
*
* @private
*/
_handleUpgrade(event) {
const db = event.target.result; // 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(OBJECT_STORE_NAME, {
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
}); // Previous versions of `workbox-expiration` used `this._cacheName`
// as the IDBDatabase name.
deleteDatabase_js.deleteDatabase(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)
};
await this._db.put(OBJECT_STORE_NAME, entry);
}
/**
* Returns the timestamp stored for a given URL.
*
* @param {string} url
* @return {number}
*
* @private
*/
async getTimestamp(url) {
const entry = await this._db.get(OBJECT_STORE_NAME, this._getId(url));
return 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 entriesToDelete = await this._db.transaction(OBJECT_STORE_NAME, 'readwrite', (txn, done) => {
const store = txn.objectStore(OBJECT_STORE_NAME);
const request = store.index('timestamp').openCursor(null, 'prev');
const entriesToDelete = [];
let entriesNotDeletedCount = 0;
request.onsuccess = () => {
const cursor = request.result;
if (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.continue();
} else {
done(entriesToDelete);
}
};
}); // 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 this._db.delete(OBJECT_STORE_NAME, 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);
}
}
/*
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 module: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.
*/
constructor(cacheName, config = {}) {
this._isRunning = false;
this._rerunRequested = false;
{
assert_js.assert.isType(cacheName, 'string', {
moduleName: 'workbox-expiration',
className: 'CacheExpiration',
funcName: 'constructor',
paramName: 'cacheName'
});
if (!(config.maxEntries || config.maxAgeSeconds)) {
throw new WorkboxError_js.WorkboxError('max-entries-or-age-required', {
moduleName: 'workbox-expiration',
className: 'CacheExpiration',
funcName: 'constructor'
});
}
if (config.maxEntries) {
assert_js.assert.isType(config.maxEntries, 'number', {
moduleName: 'workbox-expiration',
className: 'CacheExpiration',
funcName: 'constructor',
paramName: 'config.maxEntries'
}); // TODO: Assert is positive
}
if (config.maxAgeSeconds) {
assert_js.assert.isType(config.maxAgeSeconds, 'number', {
moduleName: 'workbox-expiration',
className: 'CacheExpiration',
funcName: 'constructor',
paramName: 'config.maxAgeSeconds'
}); // TODO: Assert is positive
}
}
this._maxEntries = config.maxEntries;
this._maxAgeSeconds = config.maxAgeSeconds;
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);
}
{
if (urlsExpired.length > 0) {
logger_js.logger.groupCollapsed(`Expired ${urlsExpired.length} ` + `${urlsExpired.length === 1 ? 'entry' : 'entries'} and removed ` + `${urlsExpired.length === 1 ? 'it' : 'them'} from the ` + `'${this._cacheName}' cache.`);
logger_js.logger.log(`Expired the following ${urlsExpired.length === 1 ? 'URL' : 'URLs'}:`);
urlsExpired.forEach(url => logger_js.logger.log(` ${url}`));
logger_js.logger.groupEnd();
} else {
logger_js.logger.debug(`Cache expiration ran and found no entries to remove.`);
}
}
this._isRunning = false;
if (this._rerunRequested) {
this._rerunRequested = false;
dontWaitFor_js.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) {
{
assert_js.assert.isType(url, 'string', {
moduleName: 'workbox-expiration',
className: 'CacheExpiration',
funcName: 'updateTimestamp',
paramName: '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) {
{
throw new WorkboxError_js.WorkboxError(`expired-test-without-max-age`, {
methodName: 'isURLExpired',
paramName: 'maxAgeSeconds'
});
}
} else {
const timestamp = await this._timestampModel.getTimestamp(url);
const expireOlderThan = Date.now() - this._maxAgeSeconds * 1000;
return timestamp < expireOlderThan;
}
}
/**
* 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 the Workbox APIs to regularly enforce a
* limit on the age and / or the number of cached requests.
*
* Whenever a cached request is used or updated, this plugin will look
* at the used Cache and remove any old or extra requests.
*
* When using `maxAgeSeconds`, requests may be used *once* after expiring
* because the expiration clean up will not have occurred until *after* the
* cached request has been used. If the request has a "Date" header, then
* a light weight expiration check is performed and the request will not be
* used immediately.
*
* When using `maxEntries`, the entry least-recently requested will be removed
* from the cache first.
*
* @memberof module:workbox-expiration
*/
class ExpirationPlugin {
/**
* @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 {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);
dontWaitFor_js.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) {
{
// The event may not be a fetch event; only log the URL if it is.
if ('request' in event) {
logger_js.logger.warn(`Unable to ensure service worker stays alive when ` + `updating cache entry for ` + `'${getFriendlyURL_js.getFriendlyURL(event.request.url)}'.`);
}
}
}
}
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
}) => {
{
assert_js.assert.isType(cacheName, 'string', {
moduleName: 'workbox-expiration',
className: 'Plugin',
funcName: 'cacheDidUpdate',
paramName: 'cacheName'
});
assert_js.assert.isInstance(request, Request, {
moduleName: 'workbox-expiration',
className: 'Plugin',
funcName: 'cacheDidUpdate',
paramName: 'request'
});
}
const cacheExpiration = this._getCacheExpiration(cacheName);
await cacheExpiration.updateTimestamp(request.url);
await cacheExpiration.expireEntries();
};
{
if (!(config.maxEntries || config.maxAgeSeconds)) {
throw new WorkboxError_js.WorkboxError('max-entries-or-age-required', {
moduleName: 'workbox-expiration',
className: 'Plugin',
funcName: 'constructor'
});
}
if (config.maxEntries) {
assert_js.assert.isType(config.maxEntries, 'number', {
moduleName: 'workbox-expiration',
className: 'Plugin',
funcName: 'constructor',
paramName: 'config.maxEntries'
});
}
if (config.maxAgeSeconds) {
assert_js.assert.isType(config.maxAgeSeconds, 'number', {
moduleName: 'workbox-expiration',
className: 'Plugin',
funcName: 'constructor',
paramName: 'config.maxAgeSeconds'
});
}
}
this._config = config;
this._maxAgeSeconds = config.maxAgeSeconds;
this._cacheExpirations = new Map();
if (config.purgeOnQuotaError) {
registerQuotaErrorCallback_js.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 === cacheNames_js.cacheNames.getRuntimeName()) {
throw new WorkboxError_js.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.CacheExpiration = CacheExpiration;
exports.ExpirationPlugin = ExpirationPlugin;
return exports;
}({}, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core));
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