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{"version":3,"file":"firebase-remote-config.js","sources":["../../node_modules/tslib/tslib.es6.js","../util/src/errors.ts","../component/src/component.ts","../../node_modules/idb/lib/idb.mjs","../installations/src/util/constants.ts","../installations/src/util/errors.ts","../installations/src/api/common.ts","../installations/src/util/sleep.ts","../installations/src/helpers/buffer-to-base64-url-safe.ts","../installations/src/helpers/generate-fid.ts","../installations/src/util/get-key.ts","../installations/src/helpers/fid-changed.ts","../installations/src/helpers/idb-manager.ts","../installations/src/index.ts","../logger/src/logger.ts","../installations/src/helpers/get-installation-entry.ts","../installations/src/api/create-installation-request.ts","../installations/src/api/generate-auth-token-request.ts","../installations/src/helpers/refresh-auth-token.ts","../installations/src/functions/get-token.ts","../installations/src/api/delete-installation-request.ts","../installations/src/functions/on-id-change.ts","../installations/src/helpers/extract-app-config.ts","../installations/src/functions/get-id.ts","../installations/src/functions/delete-installation.ts","../remote-config/src/client/caching_client.ts","../remote-config/src/errors.ts","../remote-config/src/client/rest_client.ts","../remote-config/src/language.ts","../remote-config/src/client/remote_config_fetch_client.ts","../remote-config/src/value.ts","../remote-config/src/remote_config.ts","../remote-config/src/storage/storage.ts","../remote-config/src/storage/storage_cache.ts","../remote-config/src/client/retrying_client.ts","../remote-config/src/client/exponential_backoff.ts","../remote-config/index.ts"],"sourcesContent":["/*! *****************************************************************************\r\nCopyright (c) Microsoft Corporation. All rights reserved.\r\nLicensed under the Apache License, Version 2.0 (the \"License\"); you may not use\r\nthis file except in compliance with the License. You may obtain a copy of the\r\nLicense at http://www.apache.org/licenses/LICENSE-2.0\r\n\r\nTHIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\r\nKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED\r\nWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,\r\nMERCHANTABLITY OR NON-INFRINGEMENT.\r\n\r\nSee the Apache Version 2.0 License for specific language governing permissions\r\nand limitations under the License.\r\n***************************************************************************** */\r\n/* global Reflect, Promise */\r\n\r\nvar extendStatics = function(d, b) {\r\n extendStatics = Object.setPrototypeOf ||\r\n ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||\r\n function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };\r\n return extendStatics(d, b);\r\n};\r\n\r\nexport function __extends(d, b) {\r\n extendStatics(d, b);\r\n function __() { this.constructor = d; }\r\n d.prototype = b === null ? 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mod : { default: mod };\r\n}\r\n\r\nexport function __classPrivateFieldGet(receiver, privateMap) {\r\n if (!privateMap.has(receiver)) {\r\n throw new TypeError(\"attempted to get private field on non-instance\");\r\n }\r\n return privateMap.get(receiver);\r\n}\r\n\r\nexport function __classPrivateFieldSet(receiver, privateMap, value) {\r\n if (!privateMap.has(receiver)) {\r\n throw new TypeError(\"attempted to set private field on non-instance\");\r\n }\r\n privateMap.set(receiver, value);\r\n return value;\r\n}\r\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/**\n * @fileoverview Standardized Firebase Error.\n *\n * Usage:\n *\n * // Typescript string literals for type-safe codes\n * type Err =\n * 'unknown' |\n * 'object-not-found'\n * ;\n *\n * // Closure enum for type-safe error codes\n * // at-enum {string}\n * var Err = {\n * UNKNOWN: 'unknown',\n * OBJECT_NOT_FOUND: 'object-not-found',\n * }\n *\n * let errors: Map<Err, string> = {\n * 'generic-error': \"Unknown error\",\n * 'file-not-found': \"Could not find file: {$file}\",\n * };\n *\n * // Type-safe function - must pass a valid error code as param.\n * let error = new ErrorFactory<Err>('service', 'Service', errors);\n *\n * ...\n * throw error.create(Err.GENERIC);\n * ...\n * throw error.create(Err.FILE_NOT_FOUND, {'file': fileName});\n * ...\n * // Service: Could not file file: foo.txt (service/file-not-found).\n *\n * catch (e) {\n * assert(e.message === \"Could not find file: foo.txt.\");\n * if (e.code === 'service/file-not-found') {\n * console.log(\"Could not read file: \" + e['file']);\n * }\n * }\n */\n\nexport type ErrorMap<ErrorCode extends string> = {\n readonly [K in ErrorCode]: string;\n};\n\nconst ERROR_NAME = 'FirebaseError';\n\nexport interface StringLike {\n toString(): string;\n}\n\nexport interface ErrorData {\n [key: string]: StringLike | undefined;\n}\n\nexport interface FirebaseError extends Error, ErrorData {\n // Unique code for error - format is service/error-code-string.\n readonly code: string;\n\n // Developer-friendly error message.\n readonly message: string;\n\n // Always 'FirebaseError'.\n readonly name: typeof ERROR_NAME;\n\n // Where available - stack backtrace in a string.\n readonly stack?: string;\n}\n\n// Based on code from:\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Custom_Error_Types\nexport class FirebaseError extends Error {\n readonly name = ERROR_NAME;\n\n constructor(readonly code: string, message: string) {\n super(message);\n\n // Fix For ES5\n // https://github.com/Microsoft/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work\n Object.setPrototypeOf(this, FirebaseError.prototype);\n\n // Maintains proper stack trace for where our error was thrown.\n // Only available on V8.\n if (Error.captureStackTrace) {\n Error.captureStackTrace(this, ErrorFactory.prototype.create);\n }\n }\n}\n\nexport class ErrorFactory<\n ErrorCode extends string,\n ErrorParams extends { readonly [K in ErrorCode]?: ErrorData } = {}\n> {\n constructor(\n private readonly service: string,\n private readonly serviceName: string,\n private readonly errors: ErrorMap<ErrorCode>\n ) {}\n\n create<K extends ErrorCode>(\n code: K,\n ...data: K extends keyof ErrorParams ? [ErrorParams[K]] : []\n ): FirebaseError {\n const customData = (data[0] as ErrorData) || {};\n const fullCode = `${this.service}/${code}`;\n const template = this.errors[code];\n\n const message = template ? replaceTemplate(template, customData) : 'Error';\n // Service Name: Error message (service/code).\n const fullMessage = `${this.serviceName}: ${message} (${fullCode}).`;\n\n const error = new FirebaseError(fullCode, fullMessage);\n\n // Keys with an underscore at the end of their name are not included in\n // error.data for some reason.\n // TODO: Replace with Object.entries when lib is updated to es2017.\n for (const key of Object.keys(customData)) {\n if (key.slice(-1) !== '_') {\n if (key in error) {\n console.warn(\n `Overwriting FirebaseError base field \"${key}\" can cause unexpected behavior.`\n );\n }\n error[key] = customData[key];\n }\n }\n\n return error;\n }\n}\n\nfunction replaceTemplate(template: string, data: ErrorData): string {\n return template.replace(PATTERN, (_, key) => {\n const value = data[key];\n return value != null ? value.toString() : `<${key}?>`;\n });\n}\n\nconst PATTERN = /\\{\\$([^}]+)}/g;\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\nimport {\n InstantiationMode,\n InstanceFactory,\n ComponentType,\n Dictionary,\n Name\n} from './types';\n\n/**\n * Component for service name T, e.g. `auth`, `auth-internal`\n */\nexport class Component<T extends Name = Name> {\n multipleInstances = false;\n /**\n * Properties to be added to the service namespace\n */\n serviceProps: Dictionary = {};\n\n instantiationMode = InstantiationMode.LAZY;\n\n /**\n *\n * @param name The public service name, e.g. app, auth, firestore, database\n * @param instanceFactory Service factory responsible for creating the public interface\n * @param type whether the service provided by the component is public or private\n */\n constructor(\n readonly name: T,\n readonly instanceFactory: InstanceFactory<T>,\n readonly type: ComponentType\n ) {}\n\n setInstantiationMode(mode: InstantiationMode): this {\n this.instantiationMode = mode;\n return this;\n }\n\n setMultipleInstances(multipleInstances: boolean): this {\n this.multipleInstances = multipleInstances;\n return this;\n }\n\n setServiceProps(props: Dictionary): this {\n this.serviceProps = props;\n return this;\n }\n}\n","function toArray(arr) {\n return Array.prototype.slice.call(arr);\n}\n\nfunction promisifyRequest(request) {\n return new Promise(function(resolve, reject) {\n request.onsuccess = function() {\n resolve(request.result);\n };\n\n request.onerror = function() {\n reject(request.error);\n };\n });\n}\n\nfunction promisifyRequestCall(obj, method, args) {\n var request;\n var p = new Promise(function(resolve, reject) {\n request = obj[method].apply(obj, args);\n promisifyRequest(request).then(resolve, reject);\n });\n\n p.request = request;\n return p;\n}\n\nfunction promisifyCursorRequestCall(obj, method, args) {\n var p = promisifyRequestCall(obj, method, args);\n return p.then(function(value) {\n if (!value) return;\n return new Cursor(value, p.request);\n });\n}\n\nfunction proxyProperties(ProxyClass, targetProp, properties) {\n properties.forEach(function(prop) {\n Object.defineProperty(ProxyClass.prototype, prop, {\n get: function() {\n return this[targetProp][prop];\n },\n set: function(val) {\n this[targetProp][prop] = val;\n }\n });\n });\n}\n\nfunction proxyRequestMethods(ProxyClass, targetProp, Constructor, properties) {\n properties.forEach(function(prop) {\n if (!(prop in Constructor.prototype)) return;\n ProxyClass.prototype[prop] = function() {\n return promisifyRequestCall(this[targetProp], prop, arguments);\n };\n });\n}\n\nfunction proxyMethods(ProxyClass, targetProp, Constructor, properties) {\n properties.forEach(function(prop) {\n if (!(prop in Constructor.prototype)) return;\n ProxyClass.prototype[prop] = function() {\n return this[targetProp][prop].apply(this[targetProp], arguments);\n };\n });\n}\n\nfunction proxyCursorRequestMethods(ProxyClass, targetProp, Constructor, properties) {\n properties.forEach(function(prop) {\n if (!(prop in Constructor.prototype)) return;\n ProxyClass.prototype[prop] = function() {\n return promisifyCursorRequestCall(this[targetProp], prop, arguments);\n };\n });\n}\n\nfunction Index(index) {\n this._index = index;\n}\n\nproxyProperties(Index, '_index', [\n 'name',\n 'keyPath',\n 'multiEntry',\n 'unique'\n]);\n\nproxyRequestMethods(Index, '_index', IDBIndex, [\n 'get',\n 'getKey',\n 'getAll',\n 'getAllKeys',\n 'count'\n]);\n\nproxyCursorRequestMethods(Index, '_index', IDBIndex, [\n 'openCursor',\n 'openKeyCursor'\n]);\n\nfunction Cursor(cursor, request) {\n this._cursor = cursor;\n this._request = request;\n}\n\nproxyProperties(Cursor, '_cursor', [\n 'direction',\n 'key',\n 'primaryKey',\n 'value'\n]);\n\nproxyRequestMethods(Cursor, '_cursor', IDBCursor, [\n 'update',\n 'delete'\n]);\n\n// proxy 'next' methods\n['advance', 'continue', 'continuePrimaryKey'].forEach(function(methodName) {\n if (!(methodName in IDBCursor.prototype)) return;\n Cursor.prototype[methodName] = function() {\n var cursor = this;\n var args = arguments;\n return Promise.resolve().then(function() {\n cursor._cursor[methodName].apply(cursor._cursor, args);\n return promisifyRequest(cursor._request).then(function(value) {\n if (!value) return;\n return new Cursor(value, cursor._request);\n });\n });\n };\n});\n\nfunction ObjectStore(store) {\n this._store = store;\n}\n\nObjectStore.prototype.createIndex = function() {\n return new Index(this._store.createIndex.apply(this._store, arguments));\n};\n\nObjectStore.prototype.index = function() {\n return new Index(this._store.index.apply(this._store, arguments));\n};\n\nproxyProperties(ObjectStore, '_store', [\n 'name',\n 'keyPath',\n 'indexNames',\n 'autoIncrement'\n]);\n\nproxyRequestMethods(ObjectStore, '_store', IDBObjectStore, [\n 'put',\n 'add',\n 'delete',\n 'clear',\n 'get',\n 'getAll',\n 'getKey',\n 'getAllKeys',\n 'count'\n]);\n\nproxyCursorRequestMethods(ObjectStore, '_store', IDBObjectStore, [\n 'openCursor',\n 'openKeyCursor'\n]);\n\nproxyMethods(ObjectStore, '_store', IDBObjectStore, [\n 'deleteIndex'\n]);\n\nfunction Transaction(idbTransaction) {\n this._tx = idbTransaction;\n this.complete = new Promise(function(resolve, reject) {\n idbTransaction.oncomplete = function() {\n resolve();\n };\n idbTransaction.onerror = function() {\n reject(idbTransaction.error);\n };\n idbTransaction.onabort = function() {\n reject(idbTransaction.error);\n };\n });\n}\n\nTransaction.prototype.objectStore = function() {\n return new ObjectStore(this._tx.objectStore.apply(this._tx, arguments));\n};\n\nproxyProperties(Transaction, '_tx', [\n 'objectStoreNames',\n 'mode'\n]);\n\nproxyMethods(Transaction, '_tx', IDBTransaction, [\n 'abort'\n]);\n\nfunction UpgradeDB(db, oldVersion, transaction) {\n this._db = db;\n this.oldVersion = oldVersion;\n this.transaction = new Transaction(transaction);\n}\n\nUpgradeDB.prototype.createObjectStore = function() {\n return new ObjectStore(this._db.createObjectStore.apply(this._db, arguments));\n};\n\nproxyProperties(UpgradeDB, '_db', [\n 'name',\n 'version',\n 'objectStoreNames'\n]);\n\nproxyMethods(UpgradeDB, '_db', IDBDatabase, [\n 'deleteObjectStore',\n 'close'\n]);\n\nfunction DB(db) {\n this._db = db;\n}\n\nDB.prototype.transaction = function() {\n return new Transaction(this._db.transaction.apply(this._db, arguments));\n};\n\nproxyProperties(DB, '_db', [\n 'name',\n 'version',\n 'objectStoreNames'\n]);\n\nproxyMethods(DB, '_db', IDBDatabase, [\n 'close'\n]);\n\n// Add cursor iterators\n// TODO: remove this once browsers do the right thing with promises\n['openCursor', 'openKeyCursor'].forEach(function(funcName) {\n [ObjectStore, Index].forEach(function(Constructor) {\n // Don't create iterateKeyCursor if openKeyCursor doesn't exist.\n if (!(funcName in Constructor.prototype)) return;\n\n Constructor.prototype[funcName.replace('open', 'iterate')] = function() {\n var args = toArray(arguments);\n var callback = args[args.length - 1];\n var nativeObject = this._store || this._index;\n var request = nativeObject[funcName].apply(nativeObject, args.slice(0, -1));\n request.onsuccess = function() {\n callback(request.result);\n };\n };\n });\n});\n\n// polyfill getAll\n[Index, ObjectStore].forEach(function(Constructor) {\n if (Constructor.prototype.getAll) return;\n Constructor.prototype.getAll = function(query, count) {\n var instance = this;\n var items = [];\n\n return new Promise(function(resolve) {\n instance.iterateCursor(query, function(cursor) {\n if (!cursor) {\n resolve(items);\n return;\n }\n items.push(cursor.value);\n\n if (count !== undefined && items.length == count) {\n resolve(items);\n return;\n }\n cursor.continue();\n });\n });\n };\n});\n\nexport function openDb(name, version, upgradeCallback) {\n var p = promisifyRequestCall(indexedDB, 'open', [name, version]);\n var request = p.request;\n\n if (request) {\n request.onupgradeneeded = function(event) {\n if (upgradeCallback) {\n upgradeCallback(new UpgradeDB(request.result, event.oldVersion, request.transaction));\n }\n };\n }\n\n return p.then(function(db) {\n return new DB(db);\n });\n}\n\nexport function deleteDb(name) {\n return promisifyRequestCall(indexedDB, 'deleteDatabase', [name]);\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { version } from '../../package.json';\n\nexport const PENDING_TIMEOUT_MS = 10000;\n\nexport const PACKAGE_VERSION = `w:${version}`;\nexport const INTERNAL_AUTH_VERSION = 'FIS_v2';\n\nexport const INSTALLATIONS_API_URL =\n 'https://firebaseinstallations.googleapis.com/v1';\n\nexport const TOKEN_EXPIRATION_BUFFER = 60 * 60 * 1000; // One hour\n\nexport const SERVICE = 'installations';\nexport const SERVICE_NAME = 'Installations';\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ErrorFactory, FirebaseError } from '@firebase/util';\nimport { SERVICE, SERVICE_NAME } from './constants';\n\nexport const enum ErrorCode {\n MISSING_APP_CONFIG_VALUES = 'missing-app-config-values',\n NOT_REGISTERED = 'not-registered',\n INSTALLATION_NOT_FOUND = 'installation-not-found',\n REQUEST_FAILED = 'request-failed',\n APP_OFFLINE = 'app-offline',\n DELETE_PENDING_REGISTRATION = 'delete-pending-registration'\n}\n\nconst ERROR_DESCRIPTION_MAP: { readonly [key in ErrorCode]: string } = {\n [ErrorCode.MISSING_APP_CONFIG_VALUES]:\n 'Missing App configuration value: \"{$valueName}\"',\n [ErrorCode.NOT_REGISTERED]: 'Firebase Installation is not registered.',\n [ErrorCode.INSTALLATION_NOT_FOUND]: 'Firebase Installation not found.',\n [ErrorCode.REQUEST_FAILED]:\n '{$requestName} request failed with error \"{$serverCode} {$serverStatus}: {$serverMessage}\"',\n [ErrorCode.APP_OFFLINE]: 'Could not process request. Application offline.',\n [ErrorCode.DELETE_PENDING_REGISTRATION]:\n \"Can't delete installation while there is a pending registration request.\"\n};\n\ninterface ErrorParams {\n [ErrorCode.MISSING_APP_CONFIG_VALUES]: {\n valueName: string;\n };\n [ErrorCode.REQUEST_FAILED]: {\n requestName: string;\n [index: string]: string | number; // to make Typescript 3.8 happy\n } & ServerErrorData;\n}\n\nexport const ERROR_FACTORY = new ErrorFactory<ErrorCode, ErrorParams>(\n SERVICE,\n SERVICE_NAME,\n ERROR_DESCRIPTION_MAP\n);\n\nexport interface ServerErrorData {\n serverCode: number;\n serverMessage: string;\n serverStatus: string;\n}\n\nexport type ServerError = FirebaseError & ServerErrorData;\n\n/** Returns true if error is a FirebaseError that is based on an error from the server. */\nexport function isServerError(error: unknown): error is ServerError {\n return (\n error instanceof FirebaseError &&\n error.code.includes(ErrorCode.REQUEST_FAILED)\n );\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseError } from '@firebase/util';\nimport { GenerateAuthTokenResponse } from '../interfaces/api-response';\nimport { AppConfig } from '../interfaces/app-config';\nimport {\n CompletedAuthToken,\n RegisteredInstallationEntry,\n RequestStatus\n} from '../interfaces/installation-entry';\nimport {\n INSTALLATIONS_API_URL,\n INTERNAL_AUTH_VERSION\n} from '../util/constants';\nimport { ERROR_FACTORY, ErrorCode } from '../util/errors';\n\nexport function getInstallationsEndpoint({ projectId }: AppConfig): string {\n return `${INSTALLATIONS_API_URL}/projects/${projectId}/installations`;\n}\n\nexport function extractAuthTokenInfoFromResponse(\n response: GenerateAuthTokenResponse\n): CompletedAuthToken {\n return {\n token: response.token,\n requestStatus: RequestStatus.COMPLETED,\n expiresIn: getExpiresInFromResponseExpiresIn(response.expiresIn),\n creationTime: Date.now()\n };\n}\n\nexport async function getErrorFromResponse(\n requestName: string,\n response: Response\n): Promise<FirebaseError> {\n const responseJson: ErrorResponse = await response.json();\n const errorData = responseJson.error;\n return ERROR_FACTORY.create(ErrorCode.REQUEST_FAILED, {\n requestName,\n serverCode: errorData.code,\n serverMessage: errorData.message,\n serverStatus: errorData.status\n });\n}\n\nexport function getHeaders({ apiKey }: AppConfig): Headers {\n return new Headers({\n 'Content-Type': 'application/json',\n Accept: 'application/json',\n 'x-goog-api-key': apiKey\n });\n}\n\nexport function getHeadersWithAuth(\n appConfig: AppConfig,\n { refreshToken }: RegisteredInstallationEntry\n): Headers {\n const headers = getHeaders(appConfig);\n headers.append('Authorization', getAuthorizationHeader(refreshToken));\n return headers;\n}\n\nexport interface ErrorResponse {\n error: {\n code: number;\n message: string;\n status: string;\n };\n}\n\n/**\n * Calls the passed in fetch wrapper and returns the response.\n * If the returned response has a status of 5xx, re-runs the function once and\n * returns the response.\n */\nexport async function retryIfServerError(\n fn: () => Promise<Response>\n): Promise<Response> {\n const result = await fn();\n\n if (result.status >= 500 && result.status < 600) {\n // Internal Server Error. Retry request.\n return fn();\n }\n\n return result;\n}\n\nfunction getExpiresInFromResponseExpiresIn(responseExpiresIn: string): number {\n // This works because the server will never respond with fractions of a second.\n return Number(responseExpiresIn.replace('s', '000'));\n}\n\nfunction getAuthorizationHeader(refreshToken: string): string {\n return `${INTERNAL_AUTH_VERSION} ${refreshToken}`;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/** Returns a promise that resolves after given time passes. */\nexport function sleep(ms: number): Promise<void> {\n return new Promise<void>(resolve => {\n setTimeout(resolve, ms);\n });\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nexport function bufferToBase64UrlSafe(array: Uint8Array): string {\n const b64 = btoa(String.fromCharCode(...array));\n return b64.replace(/\\+/g, '-').replace(/\\//g, '_');\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { bufferToBase64UrlSafe } from './buffer-to-base64-url-safe';\n\nexport const VALID_FID_PATTERN = /^[cdef][\\w-]{21}$/;\nexport const INVALID_FID = '';\n\n/**\n * Generates a new FID using random values from Web Crypto API.\n * Returns an empty string if FID generation fails for any reason.\n */\nexport function generateFid(): string {\n try {\n // A valid FID has exactly 22 base64 characters, which is 132 bits, or 16.5\n // bytes. our implementation generates a 17 byte array instead.\n const fidByteArray = new Uint8Array(17);\n const crypto =\n self.crypto || ((self as unknown) as { msCrypto: Crypto }).msCrypto;\n crypto.getRandomValues(fidByteArray);\n\n // Replace the first 4 random bits with the constant FID header of 0b0111.\n fidByteArray[0] = 0b01110000 + (fidByteArray[0] % 0b00010000);\n\n const fid = encode(fidByteArray);\n\n return VALID_FID_PATTERN.test(fid) ? fid : INVALID_FID;\n } catch {\n // FID generation errored\n return INVALID_FID;\n }\n}\n\n/** Converts a FID Uint8Array to a base64 string representation. */\nfunction encode(fidByteArray: Uint8Array): string {\n const b64String = bufferToBase64UrlSafe(fidByteArray);\n\n // Remove the 23rd character that was added because of the extra 4 bits at the\n // end of our 17 byte array, and the '=' padding.\n return b64String.substr(0, 22);\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { AppConfig } from '../interfaces/app-config';\n\n/** Returns a string key that can be used to identify the app. */\nexport function getKey(appConfig: AppConfig): string {\n return `${appConfig.appName}!${appConfig.appId}`;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getKey } from '../util/get-key';\nimport { AppConfig } from '../interfaces/app-config';\nimport { IdChangeCallbackFn } from '../functions';\n\nconst fidChangeCallbacks: Map<string, Set<IdChangeCallbackFn>> = new Map();\n\n/**\n * Calls the onIdChange callbacks with the new FID value, and broadcasts the\n * change to other tabs.\n */\nexport function fidChanged(appConfig: AppConfig, fid: string): void {\n const key = getKey(appConfig);\n\n callFidChangeCallbacks(key, fid);\n broadcastFidChange(key, fid);\n}\n\nexport function addCallback(\n appConfig: AppConfig,\n callback: IdChangeCallbackFn\n): void {\n // Open the broadcast channel if it's not already open,\n // to be able to listen to change events from other tabs.\n getBroadcastChannel();\n\n const key = getKey(appConfig);\n\n let callbackSet = fidChangeCallbacks.get(key);\n if (!callbackSet) {\n callbackSet = new Set();\n fidChangeCallbacks.set(key, callbackSet);\n }\n callbackSet.add(callback);\n}\n\nexport function removeCallback(\n appConfig: AppConfig,\n callback: IdChangeCallbackFn\n): void {\n const key = getKey(appConfig);\n\n const callbackSet = fidChangeCallbacks.get(key);\n\n if (!callbackSet) {\n return;\n }\n\n callbackSet.delete(callback);\n if (callbackSet.size === 0) {\n fidChangeCallbacks.delete(key);\n }\n\n // Close broadcast channel if there are no more callbacks.\n closeBroadcastChannel();\n}\n\nfunction callFidChangeCallbacks(key: string, fid: string): void {\n const callbacks = fidChangeCallbacks.get(key);\n if (!callbacks) {\n return;\n }\n\n for (const callback of callbacks) {\n callback(fid);\n }\n}\n\nfunction broadcastFidChange(key: string, fid: string): void {\n const channel = getBroadcastChannel();\n if (channel) {\n channel.postMessage({ key, fid });\n }\n closeBroadcastChannel();\n}\n\nlet broadcastChannel: BroadcastChannel | null = null;\n/** Opens and returns a BroadcastChannel if it is supported by the browser. */\nfunction getBroadcastChannel(): BroadcastChannel | null {\n if (!broadcastChannel && 'BroadcastChannel' in self) {\n broadcastChannel = new BroadcastChannel('[Firebase] FID Change');\n broadcastChannel.onmessage = e => {\n callFidChangeCallbacks(e.data.key, e.data.fid);\n };\n }\n return broadcastChannel;\n}\n\nfunction closeBroadcastChannel(): void {\n if (fidChangeCallbacks.size === 0 && broadcastChannel) {\n broadcastChannel.close();\n broadcastChannel = null;\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { DB, openDb } from 'idb';\nimport { AppConfig } from '../interfaces/app-config';\nimport { InstallationEntry } from '../interfaces/installation-entry';\nimport { getKey } from '../util/get-key';\nimport { fidChanged } from './fid-changed';\n\nconst DATABASE_NAME = 'firebase-installations-database';\nconst DATABASE_VERSION = 1;\nconst OBJECT_STORE_NAME = 'firebase-installations-store';\n\nlet dbPromise: Promise<DB> | null = null;\nfunction getDbPromise(): Promise<DB> {\n if (!dbPromise) {\n dbPromise = openDb(DATABASE_NAME, DATABASE_VERSION, upgradeDB => {\n // We don't use 'break' in this switch statement, the fall-through\n // behavior is what we want, because if there are multiple versions between\n // the old version and the current version, we want ALL the migrations\n // that correspond to those versions to run, not only the last one.\n // eslint-disable-next-line default-case\n switch (upgradeDB.oldVersion) {\n case 0:\n upgradeDB.createObjectStore(OBJECT_STORE_NAME);\n }\n });\n }\n return dbPromise;\n}\n\n/** Gets record(s) from the objectStore that match the given key. */\nexport async function get(\n appConfig: AppConfig\n): Promise<InstallationEntry | undefined> {\n const key = getKey(appConfig);\n const db = await getDbPromise();\n return db\n .transaction(OBJECT_STORE_NAME)\n .objectStore(OBJECT_STORE_NAME)\n .get(key);\n}\n\n/** Assigns or overwrites the record for the given key with the given value. */\nexport async function set<ValueType extends InstallationEntry>(\n appConfig: AppConfig,\n value: ValueType\n): Promise<ValueType> {\n const key = getKey(appConfig);\n const db = await getDbPromise();\n const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n const objectStore = tx.objectStore(OBJECT_STORE_NAME);\n const oldValue = await objectStore.get(key);\n await objectStore.put(value, key);\n await tx.complete;\n\n if (!oldValue || oldValue.fid !== value.fid) {\n fidChanged(appConfig, value.fid);\n }\n\n return value;\n}\n\n/** Removes record(s) from the objectStore that match the given key. */\nexport async function remove(appConfig: AppConfig): Promise<void> {\n const key = getKey(appConfig);\n const db = await getDbPromise();\n const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n await tx.objectStore(OBJECT_STORE_NAME).delete(key);\n await tx.complete;\n}\n\n/**\n * Atomically updates a record with the result of updateFn, which gets\n * called with the current value. If newValue is undefined, the record is\n * deleted instead.\n * @return Updated value\n */\nexport async function update<ValueType extends InstallationEntry | undefined>(\n appConfig: AppConfig,\n updateFn: (previousValue: InstallationEntry | undefined) => ValueType\n): Promise<ValueType> {\n const key = getKey(appConfig);\n const db = await getDbPromise();\n const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n const store = tx.objectStore(OBJECT_STORE_NAME);\n const oldValue: InstallationEntry | undefined = await store.get(key);\n const newValue = updateFn(oldValue);\n\n if (newValue === undefined) {\n await store.delete(key);\n } else {\n await store.put(newValue, key);\n }\n await tx.complete;\n\n if (newValue && (!oldValue || oldValue.fid !== newValue.fid)) {\n fidChanged(appConfig, newValue.fid);\n }\n\n return newValue;\n}\n\nexport async function clear(): Promise<void> {\n const db = await getDbPromise();\n const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n await tx.objectStore(OBJECT_STORE_NAME).clear();\n await tx.complete;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport firebase from '@firebase/app';\nimport {\n _FirebaseNamespace,\n FirebaseService\n} from '@firebase/app-types/private';\nimport { Component, ComponentType } from '@firebase/component';\nimport { FirebaseInstallations } from '@firebase/installations-types';\nimport {\n deleteInstallation,\n getId,\n getToken,\n IdChangeCallbackFn,\n IdChangeUnsubscribeFn,\n onIdChange\n} from './functions';\nimport { extractAppConfig } from './helpers/extract-app-config';\nimport { FirebaseDependencies } from './interfaces/firebase-dependencies';\n\nimport { name, version } from '../package.json';\n\nexport function registerInstallations(instance: _FirebaseNamespace): void {\n const installationsName = 'installations';\n\n instance.INTERNAL.registerComponent(\n new Component(\n installationsName,\n container => {\n const app = container.getProvider('app').getImmediate();\n\n // Throws if app isn't configured properly.\n const appConfig = extractAppConfig(app);\n const platformLoggerProvider = container.getProvider('platform-logger');\n const dependencies: FirebaseDependencies = {\n appConfig,\n platformLoggerProvider\n };\n\n const installations: FirebaseInstallations & FirebaseService = {\n app,\n getId: () => getId(dependencies),\n getToken: (forceRefresh?: boolean) =>\n getToken(dependencies, forceRefresh),\n delete: () => deleteInstallation(dependencies),\n onIdChange: (callback: IdChangeCallbackFn): IdChangeUnsubscribeFn =>\n onIdChange(dependencies, callback)\n };\n return installations;\n },\n ComponentType.PUBLIC\n )\n );\n\n instance.registerVersion(name, version);\n}\n\nregisterInstallations(firebase as _FirebaseNamespace);\n\n/**\n * Define extension behavior of `registerInstallations`\n */\ndeclare module '@firebase/app-types' {\n interface FirebaseNamespace {\n installations(app?: FirebaseApp): FirebaseInstallations;\n }\n interface FirebaseApp {\n installations(): FirebaseInstallations;\n }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nexport type LogLevelString =\n | 'debug'\n | 'verbose'\n | 'info'\n | 'warn'\n | 'error'\n | 'silent';\n\nexport interface LogOptions {\n level: LogLevelString;\n}\n\nexport type LogCallback = (callbackParams: LogCallbackParams) => void;\n\nexport interface LogCallbackParams {\n level: LogLevelString;\n message: string;\n args: unknown[];\n type: string;\n}\n\n/**\n * A container for all of the Logger instances\n */\nexport const instances: Logger[] = [];\n\n/**\n * The JS SDK supports 5 log levels and also allows a user the ability to\n * silence the logs altogether.\n *\n * The order is a follows:\n * DEBUG < VERBOSE < INFO < WARN < ERROR\n *\n * All of the log types above the current log level will be captured (i.e. if\n * you set the log level to `INFO`, errors will still be logged, but `DEBUG` and\n * `VERBOSE` logs will not)\n */\nexport enum LogLevel {\n DEBUG,\n VERBOSE,\n INFO,\n WARN,\n ERROR,\n SILENT\n}\n\nconst levelStringToEnum: { [key in LogLevelString]: LogLevel } = {\n 'debug': LogLevel.DEBUG,\n 'verbose': LogLevel.VERBOSE,\n 'info': LogLevel.INFO,\n 'warn': LogLevel.WARN,\n 'error': LogLevel.ERROR,\n 'silent': LogLevel.SILENT\n};\n\n/**\n * The default log level\n */\nconst defaultLogLevel: LogLevel = LogLevel.INFO;\n\n/**\n * We allow users the ability to pass their own log handler. We will pass the\n * type of log, the current log level, and any other arguments passed (i.e. the\n * messages that the user wants to log) to this function.\n */\nexport type LogHandler = (\n loggerInstance: Logger,\n logType: LogLevel,\n ...args: unknown[]\n) => void;\n\n/**\n * By default, `console.debug` is not displayed in the developer console (in\n * chrome). To avoid forcing users to have to opt-in to these logs twice\n * (i.e. once for firebase, and once in the console), we are sending `DEBUG`\n * logs to the `console.log` function.\n */\nconst ConsoleMethod = {\n [LogLevel.DEBUG]: 'log',\n [LogLevel.VERBOSE]: 'log',\n [LogLevel.INFO]: 'info',\n [LogLevel.WARN]: 'warn',\n [LogLevel.ERROR]: 'error'\n};\n\n/**\n * The default log handler will forward DEBUG, VERBOSE, INFO, WARN, and ERROR\n * messages on to their corresponding console counterparts (if the log method\n * is supported by the current log level)\n */\nconst defaultLogHandler: LogHandler = (instance, logType, ...args): void => {\n if (logType < instance.logLevel) {\n return;\n }\n const now = new Date().toISOString();\n const method = ConsoleMethod[logType as keyof typeof ConsoleMethod];\n if (method) {\n console[method as 'log' | 'info' | 'warn' | 'error'](\n `[${now}] ${instance.name}:`,\n ...args\n );\n } else {\n throw new Error(\n `Attempted to log a message with an invalid logType (value: ${logType})`\n );\n }\n};\n\nexport class Logger {\n /**\n * Gives you an instance of a Logger to capture messages according to\n * Firebase's logging scheme.\n *\n * @param name The name that the logs will be associated with\n */\n constructor(public name: string) {\n /**\n * Capture the current instance for later use\n */\n instances.push(this);\n }\n\n /**\n * The log level of the given Logger instance.\n */\n private _logLevel = defaultLogLevel;\n get logLevel(): LogLevel {\n return this._logLevel;\n }\n set logLevel(val: LogLevel) {\n if (!(val in LogLevel)) {\n throw new TypeError('Invalid value assigned to `logLevel`');\n }\n this._logLevel = val;\n }\n\n /**\n * The main (internal) log handler for the Logger instance.\n * Can be set to a new function in internal package code but not by user.\n */\n private _logHandler: LogHandler = defaultLogHandler;\n get logHandler(): LogHandler {\n return this._logHandler;\n }\n set logHandler(val: LogHandler) {\n if (typeof val !== 'function') {\n throw new TypeError('Value assigned to `logHandler` must be a function');\n }\n this._logHandler = val;\n }\n\n /**\n * The optional, additional, user-defined log handler for the Logger instance.\n */\n private _userLogHandler: LogHandler | null = null;\n get userLogHandler(): LogHandler | null {\n return this._userLogHandler;\n }\n set userLogHandler(val: LogHandler | null) {\n this._userLogHandler = val;\n }\n\n /**\n * The functions below are all based on the `console` interface\n */\n\n debug(...args: unknown[]): void {\n this._userLogHandler && this._userLogHandler(this, LogLevel.DEBUG, ...args);\n this._logHandler(this, LogLevel.DEBUG, ...args);\n }\n log(...args: unknown[]): void {\n this._userLogHandler &&\n this._userLogHandler(this, LogLevel.VERBOSE, ...args);\n this._logHandler(this, LogLevel.VERBOSE, ...args);\n }\n info(...args: unknown[]): void {\n this._userLogHandler && this._userLogHandler(this, LogLevel.INFO, ...args);\n this._logHandler(this, LogLevel.INFO, ...args);\n }\n warn(...args: unknown[]): void {\n this._userLogHandler && this._userLogHandler(this, LogLevel.WARN, ...args);\n this._logHandler(this, LogLevel.WARN, ...args);\n }\n error(...args: unknown[]): void {\n this._userLogHandler && this._userLogHandler(this, LogLevel.ERROR, ...args);\n this._logHandler(this, LogLevel.ERROR, ...args);\n }\n}\n\nexport function setLogLevel(level: LogLevelString | LogLevel): void {\n const newLevel = typeof level === 'string' ? levelStringToEnum[level] : level;\n instances.forEach(inst => {\n inst.logLevel = newLevel;\n });\n}\n\nexport function setUserLogHandler(\n logCallback: LogCallback | null,\n options?: LogOptions\n): void {\n for (const instance of instances) {\n let customLogLevel: LogLevel | null = null;\n if (options && options.level) {\n customLogLevel = levelStringToEnum[options.level];\n }\n if (logCallback === null) {\n instance.userLogHandler = null;\n } else {\n instance.userLogHandler = (\n instance: Logger,\n level: LogLevel,\n ...args: unknown[]\n ) => {\n const message = args\n .map(arg => {\n if (arg == null) {\n return null;\n } else if (typeof arg === 'string') {\n return arg;\n } else if (typeof arg === 'number' || typeof arg === 'boolean') {\n return arg.toString();\n } else if (arg instanceof Error) {\n return arg.message;\n } else {\n try {\n return JSON.stringify(arg);\n } catch (ignored) {\n return null;\n }\n }\n })\n .filter(arg => arg)\n .join(' ');\n if (level >= (customLogLevel ?? instance.logLevel)) {\n logCallback({\n level: LogLevel[level].toLowerCase() as LogLevelString,\n message,\n args,\n type: instance.name\n });\n }\n };\n }\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { createInstallationRequest } from '../api/create-installation-request';\nimport { AppConfig } from '../interfaces/app-config';\nimport {\n InProgressInstallationEntry,\n InstallationEntry,\n RegisteredInstallationEntry,\n RequestStatus\n} from '../interfaces/installation-entry';\nimport { PENDING_TIMEOUT_MS } from '../util/constants';\nimport { ERROR_FACTORY, ErrorCode, isServerError } from '../util/errors';\nimport { sleep } from '../util/sleep';\nimport { generateFid, INVALID_FID } from './generate-fid';\nimport { remove, set, update } from './idb-manager';\n\nexport interface InstallationEntryWithRegistrationPromise {\n installationEntry: InstallationEntry;\n /** Exist iff the installationEntry is not registered. */\n registrationPromise?: Promise<RegisteredInstallationEntry>;\n}\n\n/**\n * Updates and returns the InstallationEntry from the database.\n * Also triggers a registration request if it is necessary and possible.\n */\nexport async function getInstallationEntry(\n appConfig: AppConfig\n): Promise<InstallationEntryWithRegistrationPromise> {\n let registrationPromise: Promise<RegisteredInstallationEntry> | undefined;\n\n const installationEntry = await update(appConfig, oldEntry => {\n const installationEntry = updateOrCreateInstallationEntry(oldEntry);\n const entryWithPromise = triggerRegistrationIfNecessary(\n appConfig,\n installationEntry\n );\n registrationPromise = entryWithPromise.registrationPromise;\n return entryWithPromise.installationEntry;\n });\n\n if (installationEntry.fid === INVALID_FID) {\n // FID generation failed. Waiting for the FID from the server.\n return { installationEntry: await registrationPromise! };\n }\n\n return {\n installationEntry,\n registrationPromise\n };\n}\n\n/**\n * Creates a new Installation Entry if one does not exist.\n * Also clears timed out pending requests.\n */\nfunction updateOrCreateInstallationEntry(\n oldEntry: InstallationEntry | undefined\n): InstallationEntry {\n const entry: InstallationEntry = oldEntry || {\n fid: generateFid(),\n registrationStatus: RequestStatus.NOT_STARTED\n };\n\n return clearTimedOutRequest(entry);\n}\n\n/**\n * If the Firebase Installation is not registered yet, this will trigger the\n * registration and return an InProgressInstallationEntry.\n *\n * If registrationPromise does not exist, the installationEntry is guaranteed\n * to be registered.\n */\nfunction triggerRegistrationIfNecessary(\n appConfig: AppConfig,\n installationEntry: InstallationEntry\n): InstallationEntryWithRegistrationPromise {\n if (installationEntry.registrationStatus === RequestStatus.NOT_STARTED) {\n if (!navigator.onLine) {\n // Registration required but app is offline.\n const registrationPromiseWithError = Promise.reject(\n ERROR_FACTORY.create(ErrorCode.APP_OFFLINE)\n );\n return {\n installationEntry,\n registrationPromise: registrationPromiseWithError\n };\n }\n\n // Try registering. Change status to IN_PROGRESS.\n const inProgressEntry: InProgressInstallationEntry = {\n fid: installationEntry.fid,\n registrationStatus: RequestStatus.IN_PROGRESS,\n registrationTime: Date.now()\n };\n const registrationPromise = registerInstallation(\n appConfig,\n inProgressEntry\n );\n return { installationEntry: inProgressEntry, registrationPromise };\n } else if (\n installationEntry.registrationStatus === RequestStatus.IN_PROGRESS\n ) {\n return {\n installationEntry,\n registrationPromise: waitUntilFidRegistration(appConfig)\n };\n } else {\n return { installationEntry };\n }\n}\n\n/** This will be executed only once for each new Firebase Installation. */\nasync function registerInstallation(\n appConfig: AppConfig,\n installationEntry: InProgressInstallationEntry\n): Promise<RegisteredInstallationEntry> {\n try {\n const registeredInstallationEntry = await createInstallationRequest(\n appConfig,\n installationEntry\n );\n return set(appConfig, registeredInstallationEntry);\n } catch (e) {\n if (isServerError(e) && e.serverCode === 409) {\n // Server returned a \"FID can not be used\" error.\n // Generate a new ID next time.\n await remove(appConfig);\n } else {\n // Registration failed. Set FID as not registered.\n await set(appConfig, {\n fid: installationEntry.fid,\n registrationStatus: RequestStatus.NOT_STARTED\n });\n }\n throw e;\n }\n}\n\n/** Call if FID registration is pending in another request. */\nasync function waitUntilFidRegistration(\n appConfig: AppConfig\n): Promise<RegisteredInstallationEntry> {\n // Unfortunately, there is no way of reliably observing when a value in\n // IndexedDB changes (yet, see https://github.com/WICG/indexed-db-observers),\n // so we need to poll.\n\n let entry: InstallationEntry = await updateInstallationRequest(appConfig);\n while (entry.registrationStatus === RequestStatus.IN_PROGRESS) {\n // createInstallation request still in progress.\n await sleep(100);\n\n entry = await updateInstallationRequest(appConfig);\n }\n\n if (entry.registrationStatus === RequestStatus.NOT_STARTED) {\n // The request timed out or failed in a different call. Try again.\n const {\n installationEntry,\n registrationPromise\n } = await getInstallationEntry(appConfig);\n\n if (registrationPromise) {\n return registrationPromise;\n } else {\n // if there is no registrationPromise, entry is registered.\n return installationEntry as RegisteredInstallationEntry;\n }\n }\n\n return entry;\n}\n\n/**\n * Called only if there is a CreateInstallation request in progress.\n *\n * Updates the InstallationEntry in the DB based on the status of the\n * CreateInstallation request.\n *\n * Returns the updated InstallationEntry.\n */\nfunction updateInstallationRequest(\n appConfig: AppConfig\n): Promise<InstallationEntry> {\n return update(appConfig, oldEntry => {\n if (!oldEntry) {\n throw ERROR_FACTORY.create(ErrorCode.INSTALLATION_NOT_FOUND);\n }\n return clearTimedOutRequest(oldEntry);\n });\n}\n\nfunction clearTimedOutRequest(entry: InstallationEntry): InstallationEntry {\n if (hasInstallationRequestTimedOut(entry)) {\n return {\n fid: entry.fid,\n registrationStatus: RequestStatus.NOT_STARTED\n };\n }\n\n return entry;\n}\n\nfunction hasInstallationRequestTimedOut(\n installationEntry: InstallationEntry\n): boolean {\n return (\n installationEntry.registrationStatus === RequestStatus.IN_PROGRESS &&\n installationEntry.registrationTime + PENDING_TIMEOUT_MS < Date.now()\n );\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { CreateInstallationResponse } from '../interfaces/api-response';\nimport { AppConfig } from '../interfaces/app-config';\nimport {\n InProgressInstallationEntry,\n RegisteredInstallationEntry,\n RequestStatus\n} from '../interfaces/installation-entry';\nimport { INTERNAL_AUTH_VERSION, PACKAGE_VERSION } from '../util/constants';\nimport {\n extractAuthTokenInfoFromResponse,\n getErrorFromResponse,\n getHeaders,\n getInstallationsEndpoint,\n retryIfServerError\n} from './common';\n\nexport async function createInstallationRequest(\n appConfig: AppConfig,\n { fid }: InProgressInstallationEntry\n): Promise<RegisteredInstallationEntry> {\n const endpoint = getInstallationsEndpoint(appConfig);\n\n const headers = getHeaders(appConfig);\n const body = {\n fid,\n authVersion: INTERNAL_AUTH_VERSION,\n appId: appConfig.appId,\n sdkVersion: PACKAGE_VERSION\n };\n\n const request: RequestInit = {\n method: 'POST',\n headers,\n body: JSON.stringify(body)\n };\n\n const response = await retryIfServerError(() => fetch(endpoint, request));\n if (response.ok) {\n const responseValue: CreateInstallationResponse = await response.json();\n const registeredInstallationEntry: RegisteredInstallationEntry = {\n fid: responseValue.fid || fid,\n registrationStatus: RequestStatus.COMPLETED,\n refreshToken: responseValue.refreshToken,\n authToken: extractAuthTokenInfoFromResponse(responseValue.authToken)\n };\n return registeredInstallationEntry;\n } else {\n throw await getErrorFromResponse('Create Installation', response);\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { GenerateAuthTokenResponse } from '../interfaces/api-response';\nimport { AppConfig } from '../interfaces/app-config';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\nimport {\n CompletedAuthToken,\n RegisteredInstallationEntry\n} from '../interfaces/installation-entry';\nimport { PACKAGE_VERSION } from '../util/constants';\nimport {\n extractAuthTokenInfoFromResponse,\n getErrorFromResponse,\n getHeadersWithAuth,\n getInstallationsEndpoint,\n retryIfServerError\n} from './common';\n\nexport async function generateAuthTokenRequest(\n { appConfig, platformLoggerProvider }: FirebaseDependencies,\n installationEntry: RegisteredInstallationEntry\n): Promise<CompletedAuthToken> {\n const endpoint = getGenerateAuthTokenEndpoint(appConfig, installationEntry);\n\n const headers = getHeadersWithAuth(appConfig, installationEntry);\n\n // If platform logger exists, add the platform info string to the header.\n const platformLogger = platformLoggerProvider.getImmediate({\n optional: true\n });\n if (platformLogger) {\n headers.append('x-firebase-client', platformLogger.getPlatformInfoString());\n }\n\n const body = {\n installation: {\n sdkVersion: PACKAGE_VERSION\n }\n };\n\n const request: RequestInit = {\n method: 'POST',\n headers,\n body: JSON.stringify(body)\n };\n\n const response = await retryIfServerError(() => fetch(endpoint, request));\n if (response.ok) {\n const responseValue: GenerateAuthTokenResponse = await response.json();\n const completedAuthToken: CompletedAuthToken = extractAuthTokenInfoFromResponse(\n responseValue\n );\n return completedAuthToken;\n } else {\n throw await getErrorFromResponse('Generate Auth Token', response);\n }\n}\n\nfunction getGenerateAuthTokenEndpoint(\n appConfig: AppConfig,\n { fid }: RegisteredInstallationEntry\n): string {\n return `${getInstallationsEndpoint(appConfig)}/${fid}/authTokens:generate`;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { generateAuthTokenRequest } from '../api/generate-auth-token-request';\nimport { AppConfig } from '../interfaces/app-config';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\nimport {\n AuthToken,\n CompletedAuthToken,\n InProgressAuthToken,\n InstallationEntry,\n RegisteredInstallationEntry,\n RequestStatus\n} from '../interfaces/installation-entry';\nimport { PENDING_TIMEOUT_MS, TOKEN_EXPIRATION_BUFFER } from '../util/constants';\nimport { ERROR_FACTORY, ErrorCode, isServerError } from '../util/errors';\nimport { sleep } from '../util/sleep';\nimport { remove, set, update } from './idb-manager';\n\n/**\n * Returns a valid authentication token for the installation. Generates a new\n * token if one doesn't exist, is expired or about to expire.\n *\n * Should only be called if the Firebase Installation is registered.\n */\nexport async function refreshAuthToken(\n dependencies: FirebaseDependencies,\n forceRefresh = false\n): Promise<CompletedAuthToken> {\n let tokenPromise: Promise<CompletedAuthToken> | undefined;\n const entry = await update(dependencies.appConfig, oldEntry => {\n if (!isEntryRegistered(oldEntry)) {\n throw ERROR_FACTORY.create(ErrorCode.NOT_REGISTERED);\n }\n\n const oldAuthToken = oldEntry.authToken;\n if (!forceRefresh && isAuthTokenValid(oldAuthToken)) {\n // There is a valid token in the DB.\n return oldEntry;\n } else if (oldAuthToken.requestStatus === RequestStatus.IN_PROGRESS) {\n // There already is a token request in progress.\n tokenPromise = waitUntilAuthTokenRequest(dependencies, forceRefresh);\n return oldEntry;\n } else {\n // No token or token expired.\n if (!navigator.onLine) {\n throw ERROR_FACTORY.create(ErrorCode.APP_OFFLINE);\n }\n\n const inProgressEntry = makeAuthTokenRequestInProgressEntry(oldEntry);\n tokenPromise = fetchAuthTokenFromServer(dependencies, inProgressEntry);\n return inProgressEntry;\n }\n });\n\n const authToken = tokenPromise\n ? await tokenPromise\n : (entry.authToken as CompletedAuthToken);\n return authToken;\n}\n\n/**\n * Call only if FID is registered and Auth Token request is in progress.\n *\n * Waits until the current pending request finishes. If the request times out,\n * tries once in this thread as well.\n */\nasync function waitUntilAuthTokenRequest(\n dependencies: FirebaseDependencies,\n forceRefresh: boolean\n): Promise<CompletedAuthToken> {\n // Unfortunately, there is no way of reliably observing when a value in\n // IndexedDB changes (yet, see https://github.com/WICG/indexed-db-observers),\n // so we need to poll.\n\n let entry = await updateAuthTokenRequest(dependencies.appConfig);\n while (entry.authToken.requestStatus === RequestStatus.IN_PROGRESS) {\n // generateAuthToken still in progress.\n await sleep(100);\n\n entry = await updateAuthTokenRequest(dependencies.appConfig);\n }\n\n const authToken = entry.authToken;\n if (authToken.requestStatus === RequestStatus.NOT_STARTED) {\n // The request timed out or failed in a different call. Try again.\n return refreshAuthToken(dependencies, forceRefresh);\n } else {\n return authToken;\n }\n}\n\n/**\n * Called only if there is a GenerateAuthToken request in progress.\n *\n * Updates the InstallationEntry in the DB based on the status of the\n * GenerateAuthToken request.\n *\n * Returns the updated InstallationEntry.\n */\nfunction updateAuthTokenRequest(\n appConfig: AppConfig\n): Promise<RegisteredInstallationEntry> {\n return update(appConfig, oldEntry => {\n if (!isEntryRegistered(oldEntry)) {\n throw ERROR_FACTORY.create(ErrorCode.NOT_REGISTERED);\n }\n\n const oldAuthToken = oldEntry.authToken;\n if (hasAuthTokenRequestTimedOut(oldAuthToken)) {\n return {\n ...oldEntry,\n authToken: { requestStatus: RequestStatus.NOT_STARTED }\n };\n }\n\n return oldEntry;\n });\n}\n\nasync function fetchAuthTokenFromServer(\n dependencies: FirebaseDependencies,\n installationEntry: RegisteredInstallationEntry\n): Promise<CompletedAuthToken> {\n try {\n const authToken = await generateAuthTokenRequest(\n dependencies,\n installationEntry\n );\n const updatedInstallationEntry: RegisteredInstallationEntry = {\n ...installationEntry,\n authToken\n };\n await set(dependencies.appConfig, updatedInstallationEntry);\n return authToken;\n } catch (e) {\n if (isServerError(e) && (e.serverCode === 401 || e.serverCode === 404)) {\n // Server returned a \"FID not found\" or a \"Invalid authentication\" error.\n // Generate a new ID next time.\n await remove(dependencies.appConfig);\n } else {\n const updatedInstallationEntry: RegisteredInstallationEntry = {\n ...installationEntry,\n authToken: { requestStatus: RequestStatus.NOT_STARTED }\n };\n await set(dependencies.appConfig, updatedInstallationEntry);\n }\n throw e;\n }\n}\n\nfunction isEntryRegistered(\n installationEntry: InstallationEntry | undefined\n): installationEntry is RegisteredInstallationEntry {\n return (\n installationEntry !== undefined &&\n installationEntry.registrationStatus === RequestStatus.COMPLETED\n );\n}\n\nfunction isAuthTokenValid(authToken: AuthToken): boolean {\n return (\n authToken.requestStatus === RequestStatus.COMPLETED &&\n !isAuthTokenExpired(authToken)\n );\n}\n\nfunction isAuthTokenExpired(authToken: CompletedAuthToken): boolean {\n const now = Date.now();\n return (\n now < authToken.creationTime ||\n authToken.creationTime + authToken.expiresIn < now + TOKEN_EXPIRATION_BUFFER\n );\n}\n\n/** Returns an updated InstallationEntry with an InProgressAuthToken. */\nfunction makeAuthTokenRequestInProgressEntry(\n oldEntry: RegisteredInstallationEntry\n): RegisteredInstallationEntry {\n const inProgressAuthToken: InProgressAuthToken = {\n requestStatus: RequestStatus.IN_PROGRESS,\n requestTime: Date.now()\n };\n return {\n ...oldEntry,\n authToken: inProgressAuthToken\n };\n}\n\nfunction hasAuthTokenRequestTimedOut(authToken: AuthToken): boolean {\n return (\n authToken.requestStatus === RequestStatus.IN_PROGRESS &&\n authToken.requestTime + PENDING_TIMEOUT_MS < Date.now()\n );\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getInstallationEntry } from '../helpers/get-installation-entry';\nimport { refreshAuthToken } from '../helpers/refresh-auth-token';\nimport { AppConfig } from '../interfaces/app-config';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\n\nexport async function getToken(\n dependencies: FirebaseDependencies,\n forceRefresh = false\n): Promise<string> {\n await completeInstallationRegistration(dependencies.appConfig);\n\n // At this point we either have a Registered Installation in the DB, or we've\n // already thrown an error.\n const authToken = await refreshAuthToken(dependencies, forceRefresh);\n return authToken.token;\n}\n\nasync function completeInstallationRegistration(\n appConfig: AppConfig\n): Promise<void> {\n const { registrationPromise } = await getInstallationEntry(appConfig);\n\n if (registrationPromise) {\n // A createInstallation request is in progress. Wait until it finishes.\n await registrationPromise;\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { AppConfig } from '../interfaces/app-config';\nimport { RegisteredInstallationEntry } from '../interfaces/installation-entry';\nimport {\n getErrorFromResponse,\n getHeadersWithAuth,\n getInstallationsEndpoint,\n retryIfServerError\n} from './common';\n\nexport async function deleteInstallationRequest(\n appConfig: AppConfig,\n installationEntry: RegisteredInstallationEntry\n): Promise<void> {\n const endpoint = getDeleteEndpoint(appConfig, installationEntry);\n\n const headers = getHeadersWithAuth(appConfig, installationEntry);\n const request: RequestInit = {\n method: 'DELETE',\n headers\n };\n\n const response = await retryIfServerError(() => fetch(endpoint, request));\n if (!response.ok) {\n throw await getErrorFromResponse('Delete Installation', response);\n }\n}\n\nfunction getDeleteEndpoint(\n appConfig: AppConfig,\n { fid }: RegisteredInstallationEntry\n): string {\n return `${getInstallationsEndpoint(appConfig)}/${fid}`;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { addCallback, removeCallback } from '../helpers/fid-changed';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\n\nexport type IdChangeCallbackFn = (installationId: string) => void;\nexport type IdChangeUnsubscribeFn = () => void;\n\n/**\n * Sets a new callback that will get called when Installation ID changes.\n * Returns an unsubscribe function that will remove the callback when called.\n */\nexport function onIdChange(\n { appConfig }: FirebaseDependencies,\n callback: IdChangeCallbackFn\n): IdChangeUnsubscribeFn {\n addCallback(appConfig, callback);\n\n return () => {\n removeCallback(appConfig, callback);\n };\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseApp, FirebaseOptions } from '@firebase/app-types';\nimport { FirebaseError } from '@firebase/util';\nimport { AppConfig } from '../interfaces/app-config';\nimport { ERROR_FACTORY, ErrorCode } from '../util/errors';\n\nexport function extractAppConfig(app: FirebaseApp): AppConfig {\n if (!app || !app.options) {\n throw getMissingValueError('App Configuration');\n }\n\n if (!app.name) {\n throw getMissingValueError('App Name');\n }\n\n // Required app config keys\n const configKeys: Array<keyof FirebaseOptions> = [\n 'projectId',\n 'apiKey',\n 'appId'\n ];\n\n for (const keyName of configKeys) {\n if (!app.options[keyName]) {\n throw getMissingValueError(keyName);\n }\n }\n\n return {\n appName: app.name,\n projectId: app.options.projectId!,\n apiKey: app.options.apiKey!,\n appId: app.options.appId!\n };\n}\n\nfunction getMissingValueError(valueName: string): FirebaseError {\n return ERROR_FACTORY.create(ErrorCode.MISSING_APP_CONFIG_VALUES, {\n valueName\n });\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getInstallationEntry } from '../helpers/get-installation-entry';\nimport { refreshAuthToken } from '../helpers/refresh-auth-token';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\n\nexport async function getId(\n dependencies: FirebaseDependencies\n): Promise<string> {\n const { installationEntry, registrationPromise } = await getInstallationEntry(\n dependencies.appConfig\n );\n\n if (registrationPromise) {\n registrationPromise.catch(console.error);\n } else {\n // If the installation is already registered, update the authentication\n // token if needed.\n refreshAuthToken(dependencies).catch(console.error);\n }\n\n return installationEntry.fid;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { deleteInstallationRequest } from '../api/delete-installation-request';\nimport { remove, update } from '../helpers/idb-manager';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\nimport { RequestStatus } from '../interfaces/installation-entry';\nimport { ERROR_FACTORY, ErrorCode } from '../util/errors';\n\nexport async function deleteInstallation(\n dependencies: FirebaseDependencies\n): Promise<void> {\n const { appConfig } = dependencies;\n\n const entry = await update(appConfig, oldEntry => {\n if (oldEntry && oldEntry.registrationStatus === RequestStatus.NOT_STARTED) {\n // Delete the unregistered entry without sending a deleteInstallation request.\n return undefined;\n }\n return oldEntry;\n });\n\n if (entry) {\n if (entry.registrationStatus === RequestStatus.IN_PROGRESS) {\n // Can't delete while trying to register.\n throw ERROR_FACTORY.create(ErrorCode.DELETE_PENDING_REGISTRATION);\n } else if (entry.registrationStatus === RequestStatus.COMPLETED) {\n if (!navigator.onLine) {\n throw ERROR_FACTORY.create(ErrorCode.APP_OFFLINE);\n } else {\n await deleteInstallationRequest(appConfig, entry);\n await remove(appConfig);\n }\n }\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { StorageCache } from '../storage/storage_cache';\nimport {\n FetchResponse,\n RemoteConfigFetchClient,\n FetchRequest\n} from './remote_config_fetch_client';\nimport { Storage } from '../storage/storage';\nimport { Logger } from '@firebase/logger';\n\n/**\n * Implements the {@link RemoteConfigClient} abstraction with success response caching.\n *\n * <p>Comparable to the browser's Cache API for responses, but the Cache API requires a Service\n * Worker, which requires HTTPS, which would significantly complicate SDK installation. Also, the\n * Cache API doesn't support matching entries by time.\n */\nexport class CachingClient implements RemoteConfigFetchClient {\n constructor(\n private readonly client: RemoteConfigFetchClient,\n private readonly storage: Storage,\n private readonly storageCache: StorageCache,\n private readonly logger: Logger\n ) {}\n\n /**\n * Returns true if the age of the cached fetched configs is less than or equal to\n * {@link Settings#minimumFetchIntervalInSeconds}.\n *\n * <p>This is comparable to passing `headers = { 'Cache-Control': max-age <maxAge> }` to the\n * native Fetch API.\n *\n * <p>Visible for testing.\n */\n isCachedDataFresh(\n cacheMaxAgeMillis: number,\n lastSuccessfulFetchTimestampMillis: number | undefined\n ): boolean {\n // Cache can only be fresh if it's populated.\n if (!lastSuccessfulFetchTimestampMillis) {\n this.logger.debug('Config fetch cache check. Cache unpopulated.');\n return false;\n }\n\n // Calculates age of cache entry.\n const cacheAgeMillis = Date.now() - lastSuccessfulFetchTimestampMillis;\n\n const isCachedDataFresh = cacheAgeMillis <= cacheMaxAgeMillis;\n\n this.logger.debug(\n 'Config fetch cache check.' +\n ` Cache age millis: ${cacheAgeMillis}.` +\n ` Cache max age millis (minimumFetchIntervalMillis setting): ${cacheMaxAgeMillis}.` +\n ` Is cache hit: ${isCachedDataFresh}.`\n );\n\n return isCachedDataFresh;\n }\n\n async fetch(request: FetchRequest): Promise<FetchResponse> {\n // Reads from persisted storage to avoid cache miss if callers don't wait on initialization.\n const [\n lastSuccessfulFetchTimestampMillis,\n lastSuccessfulFetchResponse\n ] = await Promise.all([\n this.storage.getLastSuccessfulFetchTimestampMillis(),\n this.storage.getLastSuccessfulFetchResponse()\n ]);\n\n // Exits early on cache hit.\n if (\n lastSuccessfulFetchResponse &&\n this.isCachedDataFresh(\n request.cacheMaxAgeMillis,\n lastSuccessfulFetchTimestampMillis\n )\n ) {\n return lastSuccessfulFetchResponse;\n }\n\n // Deviates from pure decorator by not honoring a passed ETag since we don't have a public API\n // that allows the caller to pass an ETag.\n request.eTag =\n lastSuccessfulFetchResponse && lastSuccessfulFetchResponse.eTag;\n\n // Falls back to service on cache miss.\n const response = await this.client.fetch(request);\n\n // Fetch throws for non-success responses, so success is guaranteed here.\n\n const storageOperations = [\n // Uses write-through cache for consistency with synchronous public API.\n this.storageCache.setLastSuccessfulFetchTimestampMillis(Date.now())\n ];\n\n if (response.status === 200) {\n // Caches response only if it has changed, ie non-304 responses.\n storageOperations.push(\n this.storage.setLastSuccessfulFetchResponse(response)\n );\n }\n\n await Promise.all(storageOperations);\n\n return response;\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ErrorFactory, FirebaseError } from '@firebase/util';\n\nexport const enum ErrorCode {\n REGISTRATION_WINDOW = 'registration-window',\n REGISTRATION_PROJECT_ID = 'registration-project-id',\n REGISTRATION_API_KEY = 'registration-api-key',\n REGISTRATION_APP_ID = 'registration-app-id',\n STORAGE_OPEN = 'storage-open',\n STORAGE_GET = 'storage-get',\n STORAGE_SET = 'storage-set',\n STORAGE_DELETE = 'storage-delete',\n FETCH_NETWORK = 'fetch-client-network',\n FETCH_TIMEOUT = 'fetch-timeout',\n FETCH_THROTTLE = 'fetch-throttle',\n FETCH_PARSE = 'fetch-client-parse',\n FETCH_STATUS = 'fetch-status'\n}\n\nconst ERROR_DESCRIPTION_MAP: { readonly [key in ErrorCode]: string } = {\n [ErrorCode.REGISTRATION_WINDOW]:\n 'Undefined window object. This SDK only supports usage in a browser environment.',\n [ErrorCode.REGISTRATION_PROJECT_ID]:\n 'Undefined project identifier. Check Firebase app initialization.',\n [ErrorCode.REGISTRATION_API_KEY]:\n 'Undefined API key. Check Firebase app initialization.',\n [ErrorCode.REGISTRATION_APP_ID]:\n 'Undefined app identifier. Check Firebase app initialization.',\n [ErrorCode.STORAGE_OPEN]:\n 'Error thrown when opening storage. Original error: {$originalErrorMessage}.',\n [ErrorCode.STORAGE_GET]:\n 'Error thrown when reading from storage. Original error: {$originalErrorMessage}.',\n [ErrorCode.STORAGE_SET]:\n 'Error thrown when writing to storage. Original error: {$originalErrorMessage}.',\n [ErrorCode.STORAGE_DELETE]:\n 'Error thrown when deleting from storage. Original error: {$originalErrorMessage}.',\n [ErrorCode.FETCH_NETWORK]:\n 'Fetch client failed to connect to a network. Check Internet connection.' +\n ' Original error: {$originalErrorMessage}.',\n [ErrorCode.FETCH_TIMEOUT]:\n 'The config fetch request timed out. ' +\n ' Configure timeout using \"fetchTimeoutMillis\" SDK setting.',\n [ErrorCode.FETCH_THROTTLE]:\n 'The config fetch request timed out while in an exponential backoff state.' +\n ' Configure timeout using \"fetchTimeoutMillis\" SDK setting.' +\n ' Unix timestamp in milliseconds when fetch request throttling ends: {$throttleEndTimeMillis}.',\n [ErrorCode.FETCH_PARSE]:\n 'Fetch client could not parse response.' +\n ' Original error: {$originalErrorMessage}.',\n [ErrorCode.FETCH_STATUS]:\n 'Fetch server returned an HTTP error status. HTTP status: {$httpStatus}.'\n};\n\n// Note this is effectively a type system binding a code to params. This approach overlaps with the\n// role of TS interfaces, but works well for a few reasons:\n// 1) JS is unaware of TS interfaces, eg we can't test for interface implementation in JS\n// 2) callers should have access to a human-readable summary of the error and this interpolates\n// params into an error message;\n// 3) callers should be able to programmatically access data associated with an error, which\n// ErrorData provides.\ninterface ErrorParams {\n [ErrorCode.STORAGE_OPEN]: { originalErrorMessage: string | undefined };\n [ErrorCode.STORAGE_GET]: { originalErrorMessage: string | undefined };\n [ErrorCode.STORAGE_SET]: { originalErrorMessage: string | undefined };\n [ErrorCode.STORAGE_DELETE]: { originalErrorMessage: string | undefined };\n [ErrorCode.FETCH_NETWORK]: { originalErrorMessage: string };\n [ErrorCode.FETCH_THROTTLE]: { throttleEndTimeMillis: number };\n [ErrorCode.FETCH_PARSE]: { originalErrorMessage: string };\n [ErrorCode.FETCH_STATUS]: { httpStatus: number };\n}\n\nexport const ERROR_FACTORY = new ErrorFactory<ErrorCode, ErrorParams>(\n 'remoteconfig' /* service */,\n 'Remote Config' /* service name */,\n ERROR_DESCRIPTION_MAP\n);\n\n// Note how this is like typeof/instanceof, but for ErrorCode.\nexport function hasErrorCode(e: Error, errorCode: ErrorCode): boolean {\n return e instanceof FirebaseError && e.code.indexOf(errorCode) !== -1;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseInstallations } from '@firebase/installations-types';\nimport {\n FetchResponse,\n RemoteConfigFetchClient,\n FirebaseRemoteConfigObject,\n FetchRequest\n} from './remote_config_fetch_client';\nimport { ERROR_FACTORY, ErrorCode } from '../errors';\nimport { getUserLanguage } from '../language';\n\n/**\n * Defines request body parameters required to call the fetch API:\n * https://firebase.google.com/docs/reference/remote-config/rest\n *\n * <p>Not exported because this file encapsulates REST API specifics.\n *\n * <p>Not passing User Properties because Analytics' source of truth on Web is server-side.\n */\ninterface FetchRequestBody {\n // Disables camelcase linting for request body params.\n /* eslint-disable camelcase*/\n sdk_version: string;\n app_instance_id: string;\n app_instance_id_token: string;\n app_id: string;\n language_code: string;\n /* eslint-enable camelcase */\n}\n\n/**\n * Implements the Client abstraction for the Remote Config REST API.\n */\nexport class RestClient implements RemoteConfigFetchClient {\n constructor(\n private readonly firebaseInstallations: FirebaseInstallations,\n private readonly sdkVersion: string,\n private readonly namespace: string,\n private readonly projectId: string,\n private readonly apiKey: string,\n private readonly appId: string\n ) {}\n\n /**\n * Fetches from the Remote Config REST API.\n *\n * @throws a {@link ErrorCode.FETCH_NETWORK} error if {@link GlobalFetch#fetch} can't\n * connect to the network.\n * @throws a {@link ErrorCode.FETCH_PARSE} error if {@link Response#json} can't parse the\n * fetch response.\n * @throws a {@link ErrorCode.FETCH_STATUS} error if the service returns an HTTP error status.\n */\n async fetch(request: FetchRequest): Promise<FetchResponse> {\n const [installationId, installationToken] = await Promise.all([\n this.firebaseInstallations.getId(),\n this.firebaseInstallations.getToken()\n ]);\n\n const urlBase =\n window.FIREBASE_REMOTE_CONFIG_URL_BASE ||\n 'https://firebaseremoteconfig.googleapis.com';\n\n const url = `${urlBase}/v1/projects/${this.projectId}/namespaces/${this.namespace}:fetch?key=${this.apiKey}`;\n\n const headers = {\n 'Content-Type': 'application/json',\n 'Content-Encoding': 'gzip',\n // Deviates from pure decorator by not passing max-age header since we don't currently have\n // service behavior using that header.\n 'If-None-Match': request.eTag || '*'\n };\n\n const requestBody: FetchRequestBody = {\n /* eslint-disable camelcase */\n sdk_version: this.sdkVersion,\n app_instance_id: installationId,\n app_instance_id_token: installationToken,\n app_id: this.appId,\n language_code: getUserLanguage()\n /* eslint-enable camelcase */\n };\n\n const options = {\n method: 'POST',\n headers,\n body: JSON.stringify(requestBody)\n };\n\n // This logic isn't REST-specific, but shimming abort logic isn't worth another decorator.\n const fetchPromise = fetch(url, options);\n const timeoutPromise = new Promise((_resolve, reject) => {\n // Maps async event listener to Promise API.\n request.signal.addEventListener(() => {\n // Emulates https://heycam.github.io/webidl/#aborterror\n const error = new Error('The operation was aborted.');\n error.name = 'AbortError';\n reject(error);\n });\n });\n\n let response;\n try {\n await Promise.race([fetchPromise, timeoutPromise]);\n response = await fetchPromise;\n } catch (originalError) {\n let errorCode = ErrorCode.FETCH_NETWORK;\n if (originalError.name === 'AbortError') {\n errorCode = ErrorCode.FETCH_TIMEOUT;\n }\n throw ERROR_FACTORY.create(errorCode, {\n originalErrorMessage: originalError.message\n });\n }\n\n let status = response.status;\n\n // Normalizes nullable header to optional.\n const responseEtag = response.headers.get('ETag') || undefined;\n\n let config: FirebaseRemoteConfigObject | undefined;\n let state: string | undefined;\n\n // JSON parsing throws SyntaxError if the response body isn't a JSON string.\n // Requesting application/json and checking for a 200 ensures there's JSON data.\n if (response.status === 200) {\n let responseBody;\n try {\n responseBody = await response.json();\n } catch (originalError) {\n throw ERROR_FACTORY.create(ErrorCode.FETCH_PARSE, {\n originalErrorMessage: originalError.message\n });\n }\n config = responseBody['entries'];\n state = responseBody['state'];\n }\n\n // Normalizes based on legacy state.\n if (state === 'INSTANCE_STATE_UNSPECIFIED') {\n status = 500;\n } else if (state === 'NO_CHANGE') {\n status = 304;\n } else if (state === 'NO_TEMPLATE' || state === 'EMPTY_CONFIG') {\n // These cases can be fixed remotely, so normalize to safe value.\n config = {};\n }\n\n // Normalize to exception-based control flow for non-success cases.\n // Encapsulates HTTP specifics in this class as much as possible. Status is still the best for\n // differentiating success states (200 from 304; the state body param is undefined in a\n // standard 304).\n if (status !== 304 && status !== 200) {\n throw ERROR_FACTORY.create(ErrorCode.FETCH_STATUS, {\n httpStatus: status\n });\n }\n\n return { status, eTag: responseEtag, config };\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Attempts to get the most accurate browser language setting.\n *\n * <p>Adapted from getUserLanguage in packages/auth/src/utils.js for TypeScript.\n *\n * <p>Defers default language specification to server logic for consistency.\n *\n * @param navigatorLanguage Enables tests to override read-only {@link NavigatorLanguage}.\n */\nexport function getUserLanguage(\n navigatorLanguage: NavigatorLanguage = navigator\n): string {\n return (\n // Most reliable, but only supported in Chrome/Firefox.\n (navigatorLanguage.languages && navigatorLanguage.languages[0]) ||\n // Supported in most browsers, but returns the language of the browser\n // UI, not the language set in browser settings.\n navigatorLanguage.language\n // Polyfill otherwise.\n );\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Defines a client, as in https://en.wikipedia.org/wiki/Client%E2%80%93server_model, for the\n * Remote Config server (https://firebase.google.com/docs/reference/remote-config/rest).\n *\n * <p>Abstracts throttle, response cache and network implementation details.\n *\n * <p>Modeled after the native {@link GlobalFetch} interface, which is relatively modern and\n * convenient, but simplified for Remote Config's use case.\n *\n * Disambiguation: {@link GlobalFetch} interface and the Remote Config service define \"fetch\"\n * methods. The RestClient uses the former to make HTTP calls. This interface abstracts the latter.\n */\nexport interface RemoteConfigFetchClient {\n /**\n * @throws if response status is not 200 or 304.\n */\n fetch(request: FetchRequest): Promise<FetchResponse>;\n}\n\n/**\n * Defines a self-descriptive reference for config key-value pairs.\n */\nexport interface FirebaseRemoteConfigObject {\n [key: string]: string;\n}\n\n/**\n * Shims a minimal AbortSignal.\n *\n * <p>AbortController's AbortSignal conveniently decouples fetch timeout logic from other aspects\n * of networking, such as retries. Firebase doesn't use AbortController enough to justify a\n * polyfill recommendation, like we do with the Fetch API, but this minimal shim can easily be\n * swapped out if/when we do.\n */\nexport class RemoteConfigAbortSignal {\n listeners: Array<() => void> = [];\n addEventListener(listener: () => void): void {\n this.listeners.push(listener);\n }\n abort(): void {\n this.listeners.forEach(listener => listener());\n }\n}\n\n/**\n * Defines per-request inputs for the Remote Config fetch request.\n *\n * <p>Modeled after the native {@link Request} interface, but simplified for Remote Config's\n * use case.\n */\nexport interface FetchRequest {\n /**\n * Uses cached config if it is younger than this age.\n *\n * <p>Required because it's defined by settings, which always have a value.\n *\n * <p>Comparable to passing `headers = { 'Cache-Control': max-age <maxAge> }` to the native\n * Fetch API.\n */\n cacheMaxAgeMillis: number;\n\n /**\n * An event bus for the signal to abort a request.\n *\n * <p>Required because all requests should be abortable.\n *\n * <p>Comparable to the native\n * Fetch API's \"signal\" field on its request configuration object\n * https://fetch.spec.whatwg.org/#dom-requestinit-signal.\n *\n * <p>Disambiguation: Remote Config commonly refers to API inputs as\n * \"signals\". See the private ConfigFetchRequestBody interface for those:\n * http://google3/firebase/remote_config/web/src/core/rest_client.ts?l=14&rcl=255515243.\n */\n signal: RemoteConfigAbortSignal;\n\n /**\n * The ETag header value from the last response.\n *\n * <p>Optional in case this is the first request.\n *\n * <p>Comparable to passing `headers = { 'If-None-Match': <eTag> }` to the native Fetch API.\n */\n eTag?: string;\n}\n\n/**\n * Defines a successful response (200 or 304).\n *\n * <p>Modeled after the native {@link Response} interface, but simplified for Remote Config's\n * use case.\n */\nexport interface FetchResponse {\n /**\n * The HTTP status, which is useful for differentiating success responses with data from\n * those without.\n *\n * <p>{@link RemoteConfigClient} is modeled after the native {@link GlobalFetch} interface, so\n * HTTP status is first-class.\n *\n * <p>Disambiguation: the fetch response returns a legacy \"state\" value that is redundant with the\n * HTTP status code. The former is normalized into the latter.\n */\n status: number;\n\n /**\n * Defines the ETag response header value.\n *\n * <p>Only defined for 200 and 304 responses.\n */\n eTag?: string;\n\n /**\n * Defines the map of parameters returned as \"entries\" in the fetch response body.\n *\n * <p>Only defined for 200 responses.\n */\n config?: FirebaseRemoteConfigObject;\n\n // Note: we're not extracting experiment metadata until\n // ABT and Analytics have Web SDKs.\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Value as ValueType, ValueSource } from '@firebase/remote-config-types';\n\nconst DEFAULT_VALUE_FOR_BOOLEAN = false;\nconst DEFAULT_VALUE_FOR_STRING = '';\nconst DEFAULT_VALUE_FOR_NUMBER = 0;\n\nconst BOOLEAN_TRUTHY_VALUES = ['1', 'true', 't', 'yes', 'y', 'on'];\n\nexport class Value implements ValueType {\n constructor(\n private readonly _source: ValueSource,\n private readonly _value: string = DEFAULT_VALUE_FOR_STRING\n ) {}\n\n asString(): string {\n return this._value;\n }\n\n asBoolean(): boolean {\n if (this._source === 'static') {\n return DEFAULT_VALUE_FOR_BOOLEAN;\n }\n return BOOLEAN_TRUTHY_VALUES.indexOf(this._value.toLowerCase()) >= 0;\n }\n\n asNumber(): number {\n if (this._source === 'static') {\n return DEFAULT_VALUE_FOR_NUMBER;\n }\n let num = Number(this._value);\n if (isNaN(num)) {\n num = DEFAULT_VALUE_FOR_NUMBER;\n }\n return num;\n }\n\n getSource(): ValueSource {\n return this._source;\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseApp } from '@firebase/app-types';\nimport {\n RemoteConfig as RemoteConfigType,\n FetchStatus,\n Settings,\n Value as ValueType,\n LogLevel as RemoteConfigLogLevel\n} from '@firebase/remote-config-types';\nimport { StorageCache } from './storage/storage_cache';\nimport {\n RemoteConfigFetchClient,\n RemoteConfigAbortSignal\n} from './client/remote_config_fetch_client';\nimport { Value } from './value';\nimport { ErrorCode, hasErrorCode } from './errors';\nimport { Storage } from './storage/storage';\nimport { Logger, LogLevel as FirebaseLogLevel } from '@firebase/logger';\n\nconst DEFAULT_FETCH_TIMEOUT_MILLIS = 60 * 1000; // One minute\nconst DEFAULT_CACHE_MAX_AGE_MILLIS = 12 * 60 * 60 * 1000; // Twelve hours.\n\n/**\n * Encapsulates business logic mapping network and storage dependencies to the public SDK API.\n *\n * See {@link https://github.com/FirebasePrivate/firebase-js-sdk/blob/master/packages/firebase/index.d.ts|interface documentation} for method descriptions.\n */\nexport class RemoteConfig implements RemoteConfigType {\n // Tracks completion of initialization promise.\n private _isInitializationComplete = false;\n\n // De-duplicates initialization calls.\n private _initializePromise?: Promise<void>;\n\n settings: Settings = {\n fetchTimeoutMillis: DEFAULT_FETCH_TIMEOUT_MILLIS,\n minimumFetchIntervalMillis: DEFAULT_CACHE_MAX_AGE_MILLIS\n };\n\n defaultConfig: { [key: string]: string | number | boolean } = {};\n\n // Based on packages/firestore/src/util/log.ts but not static because we need per-instance levels\n // to differentiate 2p and 3p use-cases.\n setLogLevel(logLevel: RemoteConfigLogLevel): void {\n switch (logLevel) {\n case 'debug':\n this._logger.logLevel = FirebaseLogLevel.DEBUG;\n break;\n case 'silent':\n this._logger.logLevel = FirebaseLogLevel.SILENT;\n break;\n default:\n this._logger.logLevel = FirebaseLogLevel.ERROR;\n }\n }\n\n get fetchTimeMillis(): number {\n return this._storageCache.getLastSuccessfulFetchTimestampMillis() || -1;\n }\n\n get lastFetchStatus(): FetchStatus {\n return this._storageCache.getLastFetchStatus() || 'no-fetch-yet';\n }\n\n constructor(\n // Required by FirebaseServiceFactory interface.\n readonly app: FirebaseApp,\n // JS doesn't support private yet\n // (https://github.com/tc39/proposal-class-fields#private-fields), so we hint using an\n // underscore prefix.\n private readonly _client: RemoteConfigFetchClient,\n private readonly _storageCache: StorageCache,\n private readonly _storage: Storage,\n private readonly _logger: Logger\n ) {}\n\n async activate(): Promise<boolean> {\n const [lastSuccessfulFetchResponse, activeConfigEtag] = await Promise.all([\n this._storage.getLastSuccessfulFetchResponse(),\n this._storage.getActiveConfigEtag()\n ]);\n if (\n !lastSuccessfulFetchResponse ||\n !lastSuccessfulFetchResponse.config ||\n !lastSuccessfulFetchResponse.eTag ||\n lastSuccessfulFetchResponse.eTag === activeConfigEtag\n ) {\n // Either there is no successful fetched config, or is the same as current active\n // config.\n return false;\n }\n await Promise.all([\n this._storageCache.setActiveConfig(lastSuccessfulFetchResponse.config),\n this._storage.setActiveConfigEtag(lastSuccessfulFetchResponse.eTag)\n ]);\n return true;\n }\n\n ensureInitialized(): Promise<void> {\n if (!this._initializePromise) {\n this._initializePromise = this._storageCache\n .loadFromStorage()\n .then(() => {\n this._isInitializationComplete = true;\n });\n }\n return this._initializePromise;\n }\n\n /**\n * @throws a {@link ErrorCode.FETCH_CLIENT_TIMEOUT} if the request takes longer than\n * {@link Settings.fetchTimeoutInSeconds} or\n * {@link DEFAULT_FETCH_TIMEOUT_SECONDS}.\n */\n async fetch(): Promise<void> {\n // Aborts the request after the given timeout, causing the fetch call to\n // reject with an AbortError.\n //\n // <p>Aborting after the request completes is a no-op, so we don't need a\n // corresponding clearTimeout.\n //\n // Locating abort logic here because:\n // * it uses a developer setting (timeout)\n // * it applies to all retries (like curl's max-time arg)\n // * it is consistent with the Fetch API's signal input\n const abortSignal = new RemoteConfigAbortSignal();\n\n setTimeout(async () => {\n // Note a very low delay, eg < 10ms, can elapse before listeners are initialized.\n abortSignal.abort();\n }, this.settings.fetchTimeoutMillis);\n\n // Catches *all* errors thrown by client so status can be set consistently.\n try {\n await this._client.fetch({\n cacheMaxAgeMillis: this.settings.minimumFetchIntervalMillis,\n signal: abortSignal\n });\n\n await this._storageCache.setLastFetchStatus('success');\n } catch (e) {\n const lastFetchStatus = hasErrorCode(e, ErrorCode.FETCH_THROTTLE)\n ? 'throttle'\n : 'failure';\n await this._storageCache.setLastFetchStatus(lastFetchStatus);\n throw e;\n }\n }\n\n async fetchAndActivate(): Promise<boolean> {\n await this.fetch();\n return this.activate();\n }\n\n getAll(): { [key: string]: ValueType } {\n return getAllKeys(\n this._storageCache.getActiveConfig(),\n this.defaultConfig\n ).reduce((allConfigs, key) => {\n allConfigs[key] = this.getValue(key);\n return allConfigs;\n }, {} as { [key: string]: ValueType });\n }\n\n getBoolean(key: string): boolean {\n return this.getValue(key).asBoolean();\n }\n\n getNumber(key: string): number {\n return this.getValue(key).asNumber();\n }\n\n getString(key: string): string {\n return this.getValue(key).asString();\n }\n\n getValue(key: string): ValueType {\n if (!this._isInitializationComplete) {\n this._logger.debug(\n `A value was requested for key \"${key}\" before SDK initialization completed.` +\n ' Await on ensureInitialized if the intent was to get a previously activated value.'\n );\n }\n const activeConfig = this._storageCache.getActiveConfig();\n if (activeConfig && activeConfig[key] !== undefined) {\n return new Value('remote', activeConfig[key]);\n } else if (this.defaultConfig && this.defaultConfig[key] !== undefined) {\n return new Value('default', String(this.defaultConfig[key]));\n }\n this._logger.debug(\n `Returning static value for key \"${key}\".` +\n ' Define a default or remote value if this is unintentional.'\n );\n return new Value('static');\n }\n}\n\n/**\n * Dedupes and returns an array of all the keys of the received objects.\n */\nfunction getAllKeys(obj1: {} = {}, obj2: {} = {}): string[] {\n return Object.keys({ ...obj1, ...obj2 });\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FetchStatus } from '@firebase/remote-config-types';\nimport {\n FetchResponse,\n FirebaseRemoteConfigObject\n} from '../client/remote_config_fetch_client';\nimport { ERROR_FACTORY, ErrorCode } from '../errors';\nimport { FirebaseError } from '@firebase/util';\n\n/**\n * Converts an error event associated with a {@link IDBRequest} to a {@link FirebaseError}.\n */\nfunction toFirebaseError(event: Event, errorCode: ErrorCode): FirebaseError {\n const originalError = (event.target as IDBRequest).error || undefined;\n return ERROR_FACTORY.create(errorCode, {\n originalErrorMessage: originalError && originalError.message\n });\n}\n\n/**\n * A general-purpose store keyed by app + namespace + {@link\n * ProjectNamespaceKeyFieldValue}.\n *\n * <p>The Remote Config SDK can be used with multiple app installations, and each app can interact\n * with multiple namespaces, so this store uses app (ID + name) and namespace as common parent keys\n * for a set of key-value pairs. See {@link Storage#createCompositeKey}.\n *\n * <p>Visible for testing.\n */\nexport const APP_NAMESPACE_STORE = 'app_namespace_store';\n\nconst DB_NAME = 'firebase_remote_config';\nconst DB_VERSION = 1;\n\n/**\n * Encapsulates metadata concerning throttled fetch requests.\n */\nexport interface ThrottleMetadata {\n // The number of times fetch has backed off. Used for resuming backoff after a timeout.\n backoffCount: number;\n // The Unix timestamp in milliseconds when callers can retry a request.\n throttleEndTimeMillis: number;\n}\n\n/**\n * Provides type-safety for the \"key\" field used by {@link APP_NAMESPACE_STORE}.\n *\n * <p>This seems like a small price to avoid potentially subtle bugs caused by a typo.\n */\ntype ProjectNamespaceKeyFieldValue =\n | 'active_config'\n | 'active_config_etag'\n | 'last_fetch_status'\n | 'last_successful_fetch_timestamp_millis'\n | 'last_successful_fetch_response'\n | 'settings'\n | 'throttle_metadata';\n\n// Visible for testing.\nexport function openDatabase(): Promise<IDBDatabase> {\n return new Promise((resolve, reject) => {\n const request = indexedDB.open(DB_NAME, DB_VERSION);\n request.onerror = event => {\n reject(toFirebaseError(event, ErrorCode.STORAGE_OPEN));\n };\n request.onsuccess = event => {\n resolve((event.target as IDBOpenDBRequest).result);\n };\n request.onupgradeneeded = event => {\n const db = (event.target as IDBOpenDBRequest).result;\n\n // We don't use 'break' in this switch statement, the fall-through\n // behavior is what we want, because if there are multiple versions between\n // the old version and the current version, we want ALL the migrations\n // that correspond to those versions to run, not only the last one.\n // eslint-disable-next-line default-case\n switch (event.oldVersion) {\n case 0:\n db.createObjectStore(APP_NAMESPACE_STORE, {\n keyPath: 'compositeKey'\n });\n }\n };\n });\n}\n\n/**\n * Abstracts data persistence.\n */\nexport class Storage {\n /**\n * @param appId enables storage segmentation by app (ID + name).\n * @param appName enables storage segmentation by app (ID + name).\n * @param namespace enables storage segmentation by namespace.\n */\n constructor(\n private readonly appId: string,\n private readonly appName: string,\n private readonly namespace: string,\n private readonly openDbPromise = openDatabase()\n ) {}\n\n getLastFetchStatus(): Promise<FetchStatus | undefined> {\n return this.get<FetchStatus>('last_fetch_status');\n }\n\n setLastFetchStatus(status: FetchStatus): Promise<void> {\n return this.set<FetchStatus>('last_fetch_status', status);\n }\n\n // This is comparable to a cache entry timestamp. If we need to expire other data, we could\n // consider adding timestamp to all storage records and an optional max age arg to getters.\n getLastSuccessfulFetchTimestampMillis(): Promise<number | undefined> {\n return this.get<number>('last_successful_fetch_timestamp_millis');\n }\n\n setLastSuccessfulFetchTimestampMillis(timestamp: number): Promise<void> {\n return this.set<number>(\n 'last_successful_fetch_timestamp_millis',\n timestamp\n );\n }\n\n getLastSuccessfulFetchResponse(): Promise<FetchResponse | undefined> {\n return this.get<FetchResponse>('last_successful_fetch_response');\n }\n\n setLastSuccessfulFetchResponse(response: FetchResponse): Promise<void> {\n return this.set<FetchResponse>('last_successful_fetch_response', response);\n }\n\n getActiveConfig(): Promise<FirebaseRemoteConfigObject | undefined> {\n return this.get<FirebaseRemoteConfigObject>('active_config');\n }\n\n setActiveConfig(config: FirebaseRemoteConfigObject): Promise<void> {\n return this.set<FirebaseRemoteConfigObject>('active_config', config);\n }\n\n getActiveConfigEtag(): Promise<string | undefined> {\n return this.get<string>('active_config_etag');\n }\n\n setActiveConfigEtag(etag: string): Promise<void> {\n return this.set<string>('active_config_etag', etag);\n }\n\n getThrottleMetadata(): Promise<ThrottleMetadata | undefined> {\n return this.get<ThrottleMetadata>('throttle_metadata');\n }\n\n setThrottleMetadata(metadata: ThrottleMetadata): Promise<void> {\n return this.set<ThrottleMetadata>('throttle_metadata', metadata);\n }\n\n deleteThrottleMetadata(): Promise<void> {\n return this.delete('throttle_metadata');\n }\n\n async get<T>(key: ProjectNamespaceKeyFieldValue): Promise<T | undefined> {\n const db = await this.openDbPromise;\n return new Promise((resolve, reject) => {\n const transaction = db.transaction([APP_NAMESPACE_STORE], 'readonly');\n const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);\n const compositeKey = this.createCompositeKey(key);\n try {\n const request = objectStore.get(compositeKey);\n request.onerror = event => {\n reject(toFirebaseError(event, ErrorCode.STORAGE_GET));\n };\n request.onsuccess = event => {\n const result = (event.target as IDBRequest).result;\n if (result) {\n resolve(result.value);\n } else {\n resolve(undefined);\n }\n };\n } catch (e) {\n reject(\n ERROR_FACTORY.create(ErrorCode.STORAGE_GET, {\n originalErrorMessage: e && e.message\n })\n );\n }\n });\n }\n\n async set<T>(key: ProjectNamespaceKeyFieldValue, value: T): Promise<void> {\n const db = await this.openDbPromise;\n return new Promise((resolve, reject) => {\n const transaction = db.transaction([APP_NAMESPACE_STORE], 'readwrite');\n const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);\n const compositeKey = this.createCompositeKey(key);\n try {\n const request = objectStore.put({\n compositeKey,\n value\n });\n request.onerror = (event: Event) => {\n reject(toFirebaseError(event, ErrorCode.STORAGE_SET));\n };\n request.onsuccess = () => {\n resolve();\n };\n } catch (e) {\n reject(\n ERROR_FACTORY.create(ErrorCode.STORAGE_SET, {\n originalErrorMessage: e && e.message\n })\n );\n }\n });\n }\n\n async delete(key: ProjectNamespaceKeyFieldValue): Promise<void> {\n const db = await this.openDbPromise;\n return new Promise((resolve, reject) => {\n const transaction = db.transaction([APP_NAMESPACE_STORE], 'readwrite');\n const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);\n const compositeKey = this.createCompositeKey(key);\n try {\n const request = objectStore.delete(compositeKey);\n request.onerror = (event: Event) => {\n reject(toFirebaseError(event, ErrorCode.STORAGE_DELETE));\n };\n request.onsuccess = () => {\n resolve();\n };\n } catch (e) {\n reject(\n ERROR_FACTORY.create(ErrorCode.STORAGE_DELETE, {\n originalErrorMessage: e && e.message\n })\n );\n }\n });\n }\n\n // Facilitates composite key functionality (which is unsupported in IE).\n createCompositeKey(key: ProjectNamespaceKeyFieldValue): string {\n return [this.appId, this.appName, this.namespace, key].join();\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FetchStatus } from '@firebase/remote-config-types';\nimport { FirebaseRemoteConfigObject } from '../client/remote_config_fetch_client';\nimport { Storage } from './storage';\n\n/**\n * A memory cache layer over storage to support the SDK's synchronous read requirements.\n */\nexport class StorageCache {\n constructor(private readonly storage: Storage) {}\n\n /**\n * Memory caches.\n */\n private lastFetchStatus?: FetchStatus;\n private lastSuccessfulFetchTimestampMillis?: number;\n private activeConfig?: FirebaseRemoteConfigObject;\n\n /**\n * Memory-only getters\n */\n getLastFetchStatus(): FetchStatus | undefined {\n return this.lastFetchStatus;\n }\n\n getLastSuccessfulFetchTimestampMillis(): number | undefined {\n return this.lastSuccessfulFetchTimestampMillis;\n }\n\n getActiveConfig(): FirebaseRemoteConfigObject | undefined {\n return this.activeConfig;\n }\n\n /**\n * Read-ahead getter\n */\n async loadFromStorage(): Promise<void> {\n const lastFetchStatusPromise = this.storage.getLastFetchStatus();\n const lastSuccessfulFetchTimestampMillisPromise = this.storage.getLastSuccessfulFetchTimestampMillis();\n const activeConfigPromise = this.storage.getActiveConfig();\n\n // Note:\n // 1. we consistently check for undefined to avoid clobbering defined values\n // in memory\n // 2. we defer awaiting to improve readability, as opposed to destructuring\n // a Promise.all result, for example\n\n const lastFetchStatus = await lastFetchStatusPromise;\n if (lastFetchStatus) {\n this.lastFetchStatus = lastFetchStatus;\n }\n\n const lastSuccessfulFetchTimestampMillis = await lastSuccessfulFetchTimestampMillisPromise;\n if (lastSuccessfulFetchTimestampMillis) {\n this.lastSuccessfulFetchTimestampMillis = lastSuccessfulFetchTimestampMillis;\n }\n\n const activeConfig = await activeConfigPromise;\n if (activeConfig) {\n this.activeConfig = activeConfig;\n }\n }\n\n /**\n * Write-through setters\n */\n setLastFetchStatus(status: FetchStatus): Promise<void> {\n this.lastFetchStatus = status;\n return this.storage.setLastFetchStatus(status);\n }\n\n setLastSuccessfulFetchTimestampMillis(\n timestampMillis: number\n ): Promise<void> {\n this.lastSuccessfulFetchTimestampMillis = timestampMillis;\n return this.storage.setLastSuccessfulFetchTimestampMillis(timestampMillis);\n }\n\n setActiveConfig(activeConfig: FirebaseRemoteConfigObject): Promise<void> {\n this.activeConfig = activeConfig;\n return this.storage.setActiveConfig(activeConfig);\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n RemoteConfigAbortSignal,\n RemoteConfigFetchClient,\n FetchResponse,\n FetchRequest\n} from './remote_config_fetch_client';\nimport { ThrottleMetadata, Storage } from '../storage/storage';\nimport { calculateBackoffMillis } from './exponential_backoff';\nimport { ErrorCode, ERROR_FACTORY } from '../errors';\nimport { FirebaseError } from '@firebase/util';\n\n/**\n * Supports waiting on a backoff by:\n *\n * <ul>\n * <li>Promisifying setTimeout, so we can set a timeout in our Promise chain</li>\n * <li>Listening on a signal bus for abort events, just like the Fetch API</li>\n * <li>Failing in the same way the Fetch API fails, so timing out a live request and a throttled\n * request appear the same.</li>\n * </ul>\n *\n * <p>Visible for testing.\n */\nexport function setAbortableTimeout(\n signal: RemoteConfigAbortSignal,\n throttleEndTimeMillis: number\n): Promise<void> {\n return new Promise((resolve, reject) => {\n // Derives backoff from given end time, normalizing negative numbers to zero.\n const backoffMillis = Math.max(throttleEndTimeMillis - Date.now(), 0);\n\n const timeout = setTimeout(resolve, backoffMillis);\n\n // Adds listener, rather than sets onabort, because signal is a shared object.\n signal.addEventListener(() => {\n clearTimeout(timeout);\n\n // If the request completes before this timeout, the rejection has no effect.\n reject(\n ERROR_FACTORY.create(ErrorCode.FETCH_THROTTLE, {\n throttleEndTimeMillis\n })\n );\n });\n });\n}\n\n/**\n * Returns true if the {@link Error} indicates a fetch request may succeed later.\n */\nfunction isRetriableError(e: Error): boolean {\n if (!(e instanceof FirebaseError)) {\n return false;\n }\n\n // Uses string index defined by ErrorData, which FirebaseError implements.\n const httpStatus = Number(e['httpStatus']);\n\n return (\n httpStatus === 429 ||\n httpStatus === 500 ||\n httpStatus === 503 ||\n httpStatus === 504\n );\n}\n\n/**\n * Decorates a Client with retry logic.\n *\n * <p>Comparable to CachingClient, but uses backoff logic instead of cache max age and doesn't cache\n * responses (because the SDK has no use for error responses).\n */\nexport class RetryingClient implements RemoteConfigFetchClient {\n constructor(\n private readonly client: RemoteConfigFetchClient,\n private readonly storage: Storage\n ) {}\n\n async fetch(request: FetchRequest): Promise<FetchResponse> {\n const throttleMetadata = (await this.storage.getThrottleMetadata()) || {\n backoffCount: 0,\n throttleEndTimeMillis: Date.now()\n };\n\n return this.attemptFetch(request, throttleMetadata);\n }\n\n /**\n * A recursive helper for attempting a fetch request repeatedly.\n *\n * @throws any non-retriable errors.\n */\n async attemptFetch(\n request: FetchRequest,\n { throttleEndTimeMillis, backoffCount }: ThrottleMetadata\n ): Promise<FetchResponse> {\n // Starts with a (potentially zero) timeout to support resumption from stored state.\n // Ensures the throttle end time is honored if the last attempt timed out.\n // Note the SDK will never make a request if the fetch timeout expires at this point.\n await setAbortableTimeout(request.signal, throttleEndTimeMillis);\n\n try {\n const response = await this.client.fetch(request);\n\n // Note the SDK only clears throttle state if response is success or non-retriable.\n await this.storage.deleteThrottleMetadata();\n\n return response;\n } catch (e) {\n if (!isRetriableError(e)) {\n throw e;\n }\n\n // Increments backoff state.\n const throttleMetadata = {\n throttleEndTimeMillis:\n Date.now() + calculateBackoffMillis(backoffCount),\n backoffCount: backoffCount + 1\n };\n\n // Persists state.\n await this.storage.setThrottleMetadata(throttleMetadata);\n\n return this.attemptFetch(request, throttleMetadata);\n }\n }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * The amount of milliseconds to exponentially increase.\n */\nconst INTERVAL_MILLIS = 1000;\n\n/**\n * The factor to backoff by.\n * Should be a number greater than 1.\n */\nconst BACKOFF_FACTOR = 2;\n\n/**\n * The maximum milliseconds to increase to.\n *\n * <p>Visible for testing\n */\nexport const MAX_VALUE_MILLIS = 4 * 60 * 60 * 1000; // Four hours, like iOS and Android.\n\n/**\n * The percentage of backoff time to randomize by.\n * See\n * http://go/safe-client-behavior#step-1-determine-the-appropriate-retry-interval-to-handle-spike-traffic\n * for context.\n *\n * <p>Visible for testing\n */\nexport const RANDOM_FACTOR = 0.5;\n\n/**\n * Based on the backoff method from\n * https://github.com/google/closure-library/blob/master/closure/goog/math/exponentialbackoff.js.\n * Extracted here so we don't need to pass metadata and a stateful ExponentialBackoff object around.\n */\nexport function calculateBackoffMillis(backoffCount: number): number {\n // Calculates an exponentially increasing value.\n // Deviation: calculates value from count and a constant interval, so we only need to save value\n // and count to restore state.\n const currBaseValue =\n INTERVAL_MILLIS * Math.pow(BACKOFF_FACTOR, backoffCount);\n\n // A random \"fuzz\" to avoid waves of retries.\n // Deviation: randomFactor is required.\n const randomWait = Math.round(\n // A fraction of the backoff value to add/subtract.\n // Deviation: changes multiplication order to improve readability.\n RANDOM_FACTOR *\n currBaseValue *\n // A random float (rounded to int by Math.round above) in the range [-1, 1]. Determines\n // if we add or subtract.\n (Math.random() - 0.5) *\n 2\n );\n\n // Limits backoff to max to avoid effectively permanent backoff.\n return Math.min(MAX_VALUE_MILLIS, currBaseValue + randomWait);\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport firebase from '@firebase/app';\nimport '@firebase/installations';\nimport { _FirebaseNamespace } from '@firebase/app-types/private';\nimport { RemoteConfig as RemoteConfigType } from '@firebase/remote-config-types';\nimport { CachingClient } from './src/client/caching_client';\nimport { RestClient } from './src/client/rest_client';\nimport { RemoteConfig } from './src/remote_config';\nimport { Storage } from './src/storage/storage';\nimport { StorageCache } from './src/storage/storage_cache';\nimport { ERROR_FACTORY, ErrorCode } from './src/errors';\nimport { RetryingClient } from './src/client/retrying_client';\nimport { Logger, LogLevel as FirebaseLogLevel } from '@firebase/logger';\nimport { name as packageName, version } from './package.json';\nimport {\n Component,\n ComponentType,\n ComponentContainer\n} from '@firebase/component';\n\n// Facilitates debugging by enabling settings changes without rebuilding asset.\n// Note these debug options are not part of a documented, supported API and can change at any time.\n// Consolidates debug options for easier discovery.\n// Uses transient variables on window to avoid lingering state causing panic.\ndeclare global {\n interface Window {\n FIREBASE_REMOTE_CONFIG_URL_BASE: string;\n }\n}\n\nexport function registerRemoteConfig(\n firebaseInstance: _FirebaseNamespace\n): void {\n firebaseInstance.INTERNAL.registerComponent(\n new Component(\n 'remoteConfig',\n remoteConfigFactory,\n ComponentType.PUBLIC\n ).setMultipleInstances(true)\n );\n\n firebaseInstance.registerVersion(packageName, version);\n\n function remoteConfigFactory(\n container: ComponentContainer,\n namespace?: string\n ): RemoteConfig {\n /* Dependencies */\n // getImmediate for FirebaseApp will always succeed\n const app = container.getProvider('app').getImmediate();\n // The following call will always succeed because rc has `import '@firebase/installations'`\n const installations = container.getProvider('installations').getImmediate();\n\n // Guards against the SDK being used in non-browser environments.\n if (typeof window === 'undefined') {\n throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_WINDOW);\n }\n\n // Normalizes optional inputs.\n const { projectId, apiKey, appId } = app.options;\n if (!projectId) {\n throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_PROJECT_ID);\n }\n if (!apiKey) {\n throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_API_KEY);\n }\n if (!appId) {\n throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_APP_ID);\n }\n namespace = namespace || 'firebase';\n\n const storage = new Storage(appId, app.name, namespace);\n const storageCache = new StorageCache(storage);\n\n const logger = new Logger(packageName);\n\n // Sets ERROR as the default log level.\n // See RemoteConfig#setLogLevel for corresponding normalization to ERROR log level.\n logger.logLevel = FirebaseLogLevel.ERROR;\n\n const restClient = new RestClient(\n installations,\n // Uses the JS SDK version, by which the RC package version can be deduced, if necessary.\n firebaseInstance.SDK_VERSION,\n namespace,\n projectId,\n apiKey,\n appId\n );\n 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