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{"version":3,"file":"workbox-expiration.dev.js","sources":["../_version.mjs","../models/CacheTimestampsModel.mjs","../CacheExpiration.mjs","../Plugin.mjs","../index.mjs"],"sourcesContent":["try{self['workbox:expiration:4.3.1']&&_()}catch(e){}// eslint-disable-line","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\n\nimport {DBWrapper} from 'workbox-core/_private/DBWrapper.mjs';\nimport {deleteDatabase} from 'workbox-core/_private/deleteDatabase.mjs';\nimport '../_version.mjs';\n\n\nconst DB_NAME = 'workbox-expiration';\nconst OBJECT_STORE_NAME = 'cache-entries';\n\nconst normalizeURL = (unNormalizedUrl) => {\n const url = new URL(unNormalizedUrl, location);\n url.hash = '';\n\n return url.href;\n};\n\n\n/**\n * Returns the timestamp model.\n *\n * @private\n */\nclass CacheTimestampsModel {\n /**\n *\n * @param {string} cacheName\n *\n * @private\n */\n constructor(cacheName) {\n this._cacheName = cacheName;\n\n this._db = new DBWrapper(DB_NAME, 1, {\n onupgradeneeded: (event) => this._handleUpgrade(event),\n });\n }\n\n /**\n * Should perform an upgrade of indexedDB.\n *\n * @param {Event} event\n *\n * @private\n */\n _handleUpgrade(event) {\n const db = event.target.result;\n\n // TODO(philipwalton): EdgeHTML doesn't support arrays as a keyPath, so we\n // have to use the `id` keyPath here and create our own values (a\n // concatenation of `url + cacheName`) instead of simply using\n // `keyPath: ['url', 'cacheName']`, which is supported in other browsers.\n const objStore = db.createObjectStore(OBJECT_STORE_NAME, {keyPath: 'id'});\n\n // TODO(philipwalton): once we don't have to support EdgeHTML, we can\n // create a single index with the keyPath `['cacheName', 'timestamp']`\n // instead of doing both these indexes.\n objStore.createIndex('cacheName', 'cacheName', {unique: false});\n objStore.createIndex('timestamp', 'timestamp', {unique: false});\n\n // Previous versions of `workbox-expiration` used `this._cacheName`\n // as the IDBDatabase name.\n deleteDatabase(this._cacheName);\n }\n\n /**\n * @param {string} url\n * @param {number} timestamp\n *\n * @private\n */\n async setTimestamp(url, timestamp) {\n url = normalizeURL(url);\n\n await this._db.put(OBJECT_STORE_NAME, {\n url,\n timestamp,\n cacheName: this._cacheName,\n // Creating an ID from the URL and cache name won't be necessary once\n // Edge switches to Chromium and all browsers we support work with\n // array keyPaths.\n id: this._getId(url),\n });\n }\n\n /**\n * Returns the timestamp stored for a given URL.\n *\n * @param {string} url\n * @return {number}\n *\n * @private\n */\n async getTimestamp(url) {\n const entry = await this._db.get(OBJECT_STORE_NAME, this._getId(url));\n return entry.timestamp;\n }\n\n /**\n * Iterates through all the entries in the object store (from newest to\n * oldest) and removes entries once either `maxCount` is reached or the\n * entry's timestamp is less than `minTimestamp`.\n *\n * @param {number} minTimestamp\n * @param {number} maxCount\n *\n * @private\n */\n async expireEntries(minTimestamp, maxCount) {\n const entriesToDelete = await this._db.transaction(\n OBJECT_STORE_NAME, 'readwrite', (txn, done) => {\n const store = txn.objectStore(OBJECT_STORE_NAME);\n const entriesToDelete = [];\n let entriesNotDeletedCount = 0;\n\n store.index('timestamp')\n .openCursor(null, 'prev')\n .onsuccess = ({target}) => {\n const cursor = target.result;\n if (cursor) {\n const result = cursor.value;\n // TODO(philipwalton): once we can use a multi-key index, we\n // won't have to check `cacheName` here.\n if (result.cacheName === this._cacheName) {\n // Delete an entry if it's older than the max age or\n // if we already have the max number allowed.\n if ((minTimestamp && result.timestamp < minTimestamp) ||\n (maxCount && entriesNotDeletedCount >= maxCount)) {\n // TODO(philipwalton): we should be able to delete the\n // entry right here, but doing so causes an iteration\n // bug in Safari stable (fixed in TP). Instead we can\n // store the keys of the entries to delete, and then\n // delete the separate transactions.\n // https://github.com/GoogleChrome/workbox/issues/1978\n // cursor.delete();\n\n // We only need to return the URL, not the whole entry.\n entriesToDelete.push(cursor.value);\n } else {\n entriesNotDeletedCount++;\n }\n }\n cursor.continue();\n } else {\n done(entriesToDelete);\n }\n };\n });\n\n // TODO(philipwalton): once the Safari bug in the following issue is fixed,\n // we should be able to remove this loop and do the entry deletion in the\n // cursor loop above:\n // https://github.com/GoogleChrome/workbox/issues/1978\n const urlsDeleted = [];\n for (const entry of entriesToDelete) {\n await this._db.delete(OBJECT_STORE_NAME, entry.id);\n urlsDeleted.push(entry.url);\n }\n\n return urlsDeleted;\n }\n\n /**\n * Takes a URL and returns an ID that will be unique in the object store.\n *\n * @param {string} url\n * @return {string}\n *\n * @private\n */\n _getId(url) {\n // Creating an ID from the URL and cache name won't be necessary once\n // Edge switches to Chromium and all browsers we support work with\n // array keyPaths.\n return this._cacheName + '|' + normalizeURL(url);\n }\n}\n\nexport {CacheTimestampsModel};\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\n\nimport {CacheTimestampsModel} from './models/CacheTimestampsModel.mjs';\nimport {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';\nimport {assert} from 'workbox-core/_private/assert.mjs';\nimport {logger} from 'workbox-core/_private/logger.mjs';\n\nimport './_version.mjs';\n\n/**\n * The `CacheExpiration` class allows you define an expiration and / or\n * limit on the number of responses stored in a\n * [`Cache`](https://developer.mozilla.org/en-US/docs/Web/API/Cache).\n *\n * @memberof workbox.expiration\n */\nclass CacheExpiration {\n /**\n * To construct a new CacheExpiration instance you must provide at least\n * one of the `config` properties.\n *\n * @param {string} cacheName Name of the cache to apply restrictions to.\n * @param {Object} config\n * @param {number} [config.maxEntries] The maximum number of entries to cache.\n * Entries used the least will be removed as the maximum is reached.\n * @param {number} [config.maxAgeSeconds] The maximum age of an entry before\n * it's treated as stale and removed.\n */\n constructor(cacheName, config = {}) {\n if (process.env.NODE_ENV !== 'production') {\n assert.isType(cacheName, 'string', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n paramName: 'cacheName',\n });\n\n if (!(config.maxEntries || config.maxAgeSeconds)) {\n throw new WorkboxError('max-entries-or-age-required', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n });\n }\n\n if (config.maxEntries) {\n assert.isType(config.maxEntries, 'number', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n paramName: 'config.maxEntries',\n });\n\n // TODO: Assert is positive\n }\n\n if (config.maxAgeSeconds) {\n assert.isType(config.maxAgeSeconds, 'number', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n paramName: 'config.maxAgeSeconds',\n });\n\n // TODO: Assert is positive\n }\n }\n\n this._isRunning = false;\n this._rerunRequested = false;\n this._maxEntries = config.maxEntries;\n this._maxAgeSeconds = config.maxAgeSeconds;\n this._cacheName = cacheName;\n this._timestampModel = new CacheTimestampsModel(cacheName);\n }\n\n /**\n * Expires entries for the given cache and given criteria.\n */\n async expireEntries() {\n if (this._isRunning) {\n this._rerunRequested = true;\n return;\n }\n this._isRunning = true;\n\n const minTimestamp = this._maxAgeSeconds ?\n Date.now() - (this._maxAgeSeconds * 1000) : undefined;\n\n const urlsExpired = await this._timestampModel.expireEntries(\n minTimestamp, this._maxEntries);\n\n // Delete URLs from the cache\n const cache = await caches.open(this._cacheName);\n for (const url of urlsExpired) {\n await cache.delete(url);\n }\n\n if (process.env.NODE_ENV !== 'production') {\n if (urlsExpired.length > 0) {\n logger.groupCollapsed(\n `Expired ${urlsExpired.length} ` +\n `${urlsExpired.length === 1 ? 'entry' : 'entries'} and removed ` +\n `${urlsExpired.length === 1 ? 'it' : 'them'} from the ` +\n `'${this._cacheName}' cache.`);\n logger.log(`Expired the following ${urlsExpired.length === 1 ?\n 'URL' : 'URLs'}:`);\n urlsExpired.forEach((url) => logger.log(` ${url}`));\n logger.groupEnd();\n } else {\n logger.debug(`Cache expiration ran and found no entries to remove.`);\n }\n }\n\n this._isRunning = false;\n if (this._rerunRequested) {\n this._rerunRequested = false;\n this.expireEntries();\n }\n }\n\n /**\n * Update the timestamp for the given URL. This ensures the when\n * removing entries based on maximum entries, most recently used\n * is accurate or when expiring, the timestamp is up-to-date.\n *\n * @param {string} url\n */\n async updateTimestamp(url) {\n if (process.env.NODE_ENV !== 'production') {\n assert.isType(url, 'string', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'updateTimestamp',\n paramName: 'url',\n });\n }\n\n await this._timestampModel.setTimestamp(url, Date.now());\n }\n\n /**\n * Can be used to check if a URL has expired or not before it's used.\n *\n * This requires a look up from IndexedDB, so can be slow.\n *\n * Note: This method will not remove the cached entry, call\n * `expireEntries()` to remove indexedDB and Cache entries.\n *\n * @param {string} url\n * @return {boolean}\n */\n async isURLExpired(url) {\n if (process.env.NODE_ENV !== 'production') {\n if (!this._maxAgeSeconds) {\n throw new WorkboxError(`expired-test-without-max-age`, {\n methodName: 'isURLExpired',\n paramName: 'maxAgeSeconds',\n });\n }\n }\n\n const timestamp = await this._timestampModel.getTimestamp(url);\n const expireOlderThan = Date.now() - (this._maxAgeSeconds * 1000);\n return (timestamp < expireOlderThan);\n }\n\n /**\n * Removes the IndexedDB object store used to keep track of cache expiration\n * metadata.\n */\n async delete() {\n // Make sure we don't attempt another rerun if we're called in the middle of\n // a cache expiration.\n this._rerunRequested = false;\n await this._timestampModel.expireEntries(Infinity); // Expires all.\n }\n}\n\nexport {CacheExpiration};\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\n\nimport {assert} from 'workbox-core/_private/assert.mjs';\nimport {cacheNames} from 'workbox-core/_private/cacheNames.mjs';\nimport {getFriendlyURL} from 'workbox-core/_private/getFriendlyURL.mjs';\nimport {logger} from 'workbox-core/_private/logger.mjs';\nimport {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';\nimport {registerQuotaErrorCallback}\n from 'workbox-core/registerQuotaErrorCallback.mjs';\n\nimport {CacheExpiration} from './CacheExpiration.mjs';\nimport './_version.mjs';\n\n/**\n * This plugin can be used in the Workbox APIs to regularly enforce a\n * limit on the age and / or the number of cached requests.\n *\n * Whenever a cached request is used or updated, this plugin will look\n * at the used Cache and remove any old or extra requests.\n *\n * When using `maxAgeSeconds`, requests may be used *once* after expiring\n * because the expiration clean up will not have occurred until *after* the\n * cached request has been used. If the request has a \"Date\" header, then\n * a light weight expiration check is performed and the request will not be\n * used immediately.\n *\n * When using `maxEntries`, the entry least-recently requested will be removed from the cache first.\n *\n * @memberof workbox.expiration\n */\nclass Plugin {\n /**\n * @param {Object} config\n * @param {number} [config.maxEntries] The maximum number of entries to cache.\n * Entries used the least will be removed as the maximum is reached.\n * @param {number} [config.maxAgeSeconds] The maximum age of an entry before\n * it's treated as stale and removed.\n * @param {boolean} [config.purgeOnQuotaError] Whether to opt this cache in to\n * automatic deletion if the available storage quota has been exceeded.\n */\n constructor(config = {}) {\n if (process.env.NODE_ENV !== 'production') {\n if (!(config.maxEntries || config.maxAgeSeconds)) {\n throw new WorkboxError('max-entries-or-age-required', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'constructor',\n });\n }\n\n if (config.maxEntries) {\n assert.isType(config.maxEntries, 'number', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'constructor',\n paramName: 'config.maxEntries',\n });\n }\n\n if (config.maxAgeSeconds) {\n assert.isType(config.maxAgeSeconds, 'number', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'constructor',\n paramName: 'config.maxAgeSeconds',\n });\n }\n }\n\n this._config = config;\n this._maxAgeSeconds = config.maxAgeSeconds;\n this._cacheExpirations = new Map();\n\n if (config.purgeOnQuotaError) {\n registerQuotaErrorCallback(() => this.deleteCacheAndMetadata());\n }\n }\n\n /**\n * A simple helper method to return a CacheExpiration instance for a given\n * cache name.\n *\n * @param {string} cacheName\n * @return {CacheExpiration}\n *\n * @private\n */\n _getCacheExpiration(cacheName) {\n if (cacheName === cacheNames.getRuntimeName()) {\n throw new WorkboxError('expire-custom-caches-only');\n }\n\n let cacheExpiration = this._cacheExpirations.get(cacheName);\n if (!cacheExpiration) {\n cacheExpiration = new CacheExpiration(cacheName, this._config);\n this._cacheExpirations.set(cacheName, cacheExpiration);\n }\n return cacheExpiration;\n }\n\n /**\n * A \"lifecycle\" callback that will be triggered automatically by the\n * `workbox.strategies` handlers when a `Response` is about to be returned\n * from a [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache) to\n * the handler. It allows the `Response` to be inspected for freshness and\n * prevents it from being used if the `Response`'s `Date` header value is\n * older than the configured `maxAgeSeconds`.\n *\n * @param {Object} options\n * @param {string} options.cacheName Name of the cache the response is in.\n * @param {Response} options.cachedResponse The `Response` object that's been\n * read from a cache and whose freshness should be checked.\n * @return {Response} Either the `cachedResponse`, if it's\n * fresh, or `null` if the `Response` is older than `maxAgeSeconds`.\n *\n * @private\n */\n cachedResponseWillBeUsed({event, request, cacheName, cachedResponse}) {\n if (!cachedResponse) {\n return null;\n }\n\n let isFresh = this._isResponseDateFresh(cachedResponse);\n\n // Expire entries to ensure that even if the expiration date has\n // expired, it'll only be used once.\n const cacheExpiration = this._getCacheExpiration(cacheName);\n cacheExpiration.expireEntries();\n\n // Update the metadata for the request URL to the current timestamp,\n // but don't `await` it as we don't want to block the response.\n const updateTimestampDone = cacheExpiration.updateTimestamp(request.url);\n if (event) {\n try {\n event.waitUntil(updateTimestampDone);\n } catch (error) {\n if (process.env.NODE_ENV !== 'production') {\n logger.warn(`Unable to ensure service worker stays alive when ` +\n `updating cache entry for '${getFriendlyURL(event.request.url)}'.`);\n }\n }\n }\n\n return isFresh ? cachedResponse : null;\n }\n\n /**\n * @param {Response} cachedResponse\n * @return {boolean}\n *\n * @private\n */\n _isResponseDateFresh(cachedResponse) {\n if (!this._maxAgeSeconds) {\n // We aren't expiring by age, so return true, it's fresh\n return true;\n }\n\n // Check if the 'date' header will suffice a quick expiration check.\n // See https://github.com/GoogleChromeLabs/sw-toolbox/issues/164 for\n // discussion.\n const dateHeaderTimestamp = this._getDateHeaderTimestamp(cachedResponse);\n if (dateHeaderTimestamp === null) {\n // Unable to parse date, so assume it's fresh.\n return true;\n }\n\n // If we have a valid headerTime, then our response is fresh iff the\n // headerTime plus maxAgeSeconds is greater than the current time.\n const now = Date.now();\n return dateHeaderTimestamp >= now - (this._maxAgeSeconds * 1000);\n }\n\n /**\n * This method will extract the data header and parse it into a useful\n * value.\n *\n * @param {Response} cachedResponse\n * @return {number}\n *\n * @private\n */\n _getDateHeaderTimestamp(cachedResponse) {\n if (!cachedResponse.headers.has('date')) {\n return null;\n }\n\n const dateHeader = cachedResponse.headers.get('date');\n const parsedDate = new Date(dateHeader);\n const headerTime = parsedDate.getTime();\n\n // If the Date header was invalid for some reason, parsedDate.getTime()\n // will return NaN.\n if (isNaN(headerTime)) {\n return null;\n }\n\n return headerTime;\n }\n\n /**\n * A \"lifecycle\" callback that will be triggered automatically by the\n * `workbox.strategies` handlers when an entry is added to a cache.\n *\n * @param {Object} options\n * @param {string} options.cacheName Name of the cache that was updated.\n * @param {string} options.request The Request for the cached entry.\n *\n * @private\n */\n async cacheDidUpdate({cacheName, request}) {\n if (process.env.NODE_ENV !== 'production') {\n assert.isType(cacheName, 'string', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'cacheDidUpdate',\n paramName: 'cacheName',\n });\n assert.isInstance(request, Request, {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'cacheDidUpdate',\n paramName: 'request',\n });\n }\n\n const cacheExpiration = this._getCacheExpiration(cacheName);\n await cacheExpiration.updateTimestamp(request.url);\n await cacheExpiration.expireEntries();\n }\n\n\n /**\n * This is a helper method that performs two operations:\n *\n * - Deletes *all* the underlying Cache instances associated with this plugin\n * instance, by calling caches.delete() on your behalf.\n * - Deletes the metadata from IndexedDB used to keep track of expiration\n * details for each Cache instance.\n *\n * When using cache expiration, calling this method is preferable to calling\n * `caches.delete()` directly, since this will ensure that the IndexedDB\n * metadata is also cleanly removed and open IndexedDB instances are deleted.\n *\n * Note that if you're *not* using cache expiration for a given cache, calling\n * `caches.delete()` and passing in the cache's name should be sufficient.\n * There is no Workbox-specific method needed for cleanup in that case.\n */\n async deleteCacheAndMetadata() {\n // Do this one at a time instead of all at once via `Promise.all()` to\n // reduce the chance of inconsistency if a promise rejects.\n for (const [cacheName, cacheExpiration] of this._cacheExpirations) {\n await caches.delete(cacheName);\n await cacheExpiration.delete();\n }\n\n // Reset this._cacheExpirations to its initial state.\n this._cacheExpirations = new Map();\n }\n}\n\nexport {Plugin};\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\n\nimport {CacheExpiration} from './CacheExpiration.mjs';\nimport {Plugin} from './Plugin.mjs';\nimport './_version.mjs';\n\n\n/**\n * @namespace workbox.expiration\n */\n\nexport {\n CacheExpiration,\n 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