import Lock from 'browser-tabs-lock';

import {
  createQueryParams,
  runPopup,
  parseQueryResult,
  encode,
  createRandomString,
  runIframe,
  sha256,
  bufferToBase64UrlEncoded,
  validateCrypto,
  openPopup
} from './utils';

import { oauthToken } from './api';

import { getUniqueScopes } from './scope';

import {
  InMemoryCache,
  ICache,
  LocalStorageCache,
  CacheKey,
  CacheManager
} from './cache';

import TransactionManager from './transaction-manager';
import { verify as verifyIdToken } from './jwt';
import { AuthenticationError, GenericError, TimeoutError } from './errors';

import {
  ClientStorage,
  CookieStorage,
  CookieStorageWithLegacySameSite,
  SessionStorage
} from './storage';

import {
  CACHE_LOCATION_MEMORY,
  DEFAULT_POPUP_CONFIG_OPTIONS,
  DEFAULT_AUTHORIZE_TIMEOUT_IN_SECONDS,
  MISSING_REFRESH_TOKEN_ERROR_MESSAGE,
  DEFAULT_SCOPE,
  RECOVERABLE_ERRORS,
  DEFAULT_SESSION_CHECK_EXPIRY_DAYS,
  DEFAULT_AUTH0_CLIENT,
  INVALID_REFRESH_TOKEN_ERROR_MESSAGE,
  DEFAULT_NOW_PROVIDER,
  DEFAULT_FETCH_TIMEOUT_MS, DEFAULT_ENDPOINT_AUTHORIZE, DEFAULT_ENDPOINT_TOKEN, DEFAULT_ENDPOINT_LOGOUT
} from "./constants"

import {
  Auth0ClientOptions,
  BaseLoginOptions,
  AuthorizeOptions,
  RedirectLoginOptions,
  PopupLoginOptions,
  PopupConfigOptions,
  GetUserOptions,
  GetIdTokenClaimsOptions,
  RedirectLoginResult,
  GetTokenSilentlyOptions,
  GetTokenWithPopupOptions,
  LogoutOptions,
  RefreshTokenOptions,
  OAuthTokenOptions,
  CacheLocation,
  LogoutUrlOptions,
  User,
  IdToken,
  GetTokenSilentlyVerboseResponse,
  TokenEndpointResponse
} from './global';

// @ts-ignore
import TokenWorker from './worker/token.worker.ts';
import { isIE11 } from './user-agent';
import { singlePromise, retryPromise } from './promise-utils';
import { CacheKeyManifest } from './cache/key-manifest';

/**
 * @ignore
 */
type GetTokenSilentlyResult = TokenEndpointResponse & {
  decodedToken: ReturnType<typeof verifyIdToken>;
  scope: string;
  oauthTokenScope?: string;
  audience: string;
};

/**
 * @ignore
 */
const lock = new Lock();

/**
 * @ignore
 */
const GET_TOKEN_SILENTLY_LOCK_KEY = 'auth0.lock.getTokenSilently';

/**
 * @ignore
 */
const buildOrganizationHintCookieName = (clientId: string) =>
  `auth0.${clientId}.organization_hint`;

/**
 * @ignore
 */
const OLD_IS_AUTHENTICATED_COOKIE_NAME = 'auth0.is.authenticated';

/**
 * @ignore
 */
const buildIsAuthenticatedCookieName = (clientId: string) =>
  `auth0.${clientId}.is.authenticated`;

/**
 * @ignore
 */
const cacheLocationBuilders: Record<string, () => ICache> = {
  memory: () => new InMemoryCache().enclosedCache,
  localstorage: () => new LocalStorageCache()
};

/**
 * @ignore
 */
const cacheFactory = (location: string) => {
  return cacheLocationBuilders[location];
};

/**
 * @ignore
 */
const supportWebWorker = () => !isIE11();

/**
 * @ignore
 */
const getTokenIssuer = (issuer: string, domainUrl: string) => {
  if (issuer) {
    return issuer.startsWith('https://') ? issuer : `https://${issuer}/`;
  }

  return `${domainUrl}/`;
};

/**
 * @ignore
 */
const getDomain = (domainUrl: string) => {
  if (!/^https?:\/\//.test(domainUrl)) {
    return `https://${domainUrl}`;
  }

  return domainUrl;
};

/**
 * @ignore
 */
const getCustomInitialOptions = (
  options: Auth0ClientOptions
): BaseLoginOptions => {
  const {
    advancedOptions,
    audience,
    auth0Client,
    authorizeTimeoutInSeconds,
    cacheLocation,
    client_id,
    domain,
    issuer,
    leeway,
    max_age,
    redirect_uri,
    scope,
    useRefreshTokens,
    useCookiesForTransactions,
    useFormData,
    ...customParams
  } = options;
  return customParams;
};

/**
 * Auth0 SDK for Single Page Applications using [Authorization Code Grant Flow with PKCE](https://auth0.com/docs/api-auth/tutorials/authorization-code-grant-pkce).
 */
export default class Auth0Client {
  private readonly endpoints: {
    authorize: string;
    logout: string;
    token: string;
  };

  private readonly transactionManager: TransactionManager;
  private readonly cacheManager: CacheManager;
  private readonly customOptions: BaseLoginOptions;
  private readonly domainUrl: string;
  private readonly tokenIssuer: string;
  private readonly defaultScope: string;
  private readonly scope: string;
  private readonly cookieStorage: ClientStorage;
  private readonly sessionCheckExpiryDays: number;
  private readonly orgHintCookieName: string;
  private readonly isAuthenticatedCookieName: string;
  private readonly nowProvider: () => number | Promise<number>;
  private readonly httpTimeoutMs: number;

  cacheLocation: CacheLocation;
  private readonly worker: Worker;

  constructor(private options: Auth0ClientOptions) {
    typeof window !== 'undefined' && validateCrypto();

    if (options.cache && options.cacheLocation) {
      console.warn(
        'Both `cache` and `cacheLocation` options have been specified in the Auth0Client configuration; ignoring `cacheLocation` and using `cache`.'
      );
    }

    let cache: ICache;

    if (options.cache) {
      cache = options.cache;
    } else {
      this.cacheLocation = options.cacheLocation || CACHE_LOCATION_MEMORY;

      if (!cacheFactory(this.cacheLocation)) {
        throw new Error(`Invalid cache location "${this.cacheLocation}"`);
      }

      cache = cacheFactory(this.cacheLocation)();
    }

    this.httpTimeoutMs = options.httpTimeoutInSeconds
      ? options.httpTimeoutInSeconds * 1000
      : DEFAULT_FETCH_TIMEOUT_MS;

    this.cookieStorage =
      options.legacySameSiteCookie === false
        ? CookieStorage
        : CookieStorageWithLegacySameSite;

    this.orgHintCookieName = buildOrganizationHintCookieName(
      this.options.client_id
    );

    this.isAuthenticatedCookieName = buildIsAuthenticatedCookieName(
      this.options.client_id
    );

    this.sessionCheckExpiryDays =
      options.sessionCheckExpiryDays || DEFAULT_SESSION_CHECK_EXPIRY_DAYS;

    const transactionStorage = options.useCookiesForTransactions
      ? this.cookieStorage
      : SessionStorage;

    this.scope = this.options.scope;

    this.transactionManager = new TransactionManager(
      transactionStorage,
      this.options.client_id
    );

    this.nowProvider = this.options.nowProvider || DEFAULT_NOW_PROVIDER;

    this.cacheManager = new CacheManager(
      cache,
      !cache.allKeys
        ? new CacheKeyManifest(cache, this.options.client_id)
        : null,
      this.nowProvider
    );

    this.domainUrl = getDomain(this.options.domain);

    this.endpoints = this.options.endpoints ? {
      token: this.options.endpoints.token || DEFAULT_ENDPOINT_TOKEN,
      authorize: this.options.endpoints.authorize || DEFAULT_ENDPOINT_AUTHORIZE,
      logout: this.options.endpoints.logout || DEFAULT_ENDPOINT_LOGOUT,
    } : {
      token: DEFAULT_ENDPOINT_TOKEN,
      authorize: DEFAULT_ENDPOINT_AUTHORIZE,
      logout: DEFAULT_ENDPOINT_LOGOUT,
    }

    this.tokenIssuer = getTokenIssuer(this.options.issuer, this.domainUrl);

    this.defaultScope = getUniqueScopes(
      'openid',
      this.options?.advancedOptions?.defaultScope !== undefined
        ? this.options.advancedOptions.defaultScope
        : DEFAULT_SCOPE
    );

    // If using refresh tokens, automatically specify the `offline_access` scope.
    // Note we cannot add this to 'defaultScope' above as the scopes are used in the
    // cache keys - changing the order could invalidate the keys
    if (this.options.useRefreshTokens) {
      this.scope = getUniqueScopes(this.scope, 'offline_access');
    }

    // Don't use web workers unless using refresh tokens in memory and not IE11
    if (
      typeof window !== 'undefined' &&
      window.Worker &&
      this.options.useRefreshTokens &&
      this.cacheLocation === CACHE_LOCATION_MEMORY &&
      supportWebWorker()
    ) {
      this.worker = new TokenWorker();
    }

    this.customOptions = getCustomInitialOptions(options);
  }

  private _url(path: string) {
    const auth0Client = encodeURIComponent(
      btoa(JSON.stringify(this.options.auth0Client || DEFAULT_AUTH0_CLIENT))
    );
    return `${this.domainUrl}${path}&auth0Client=${auth0Client}`;
  }

  private _getParams(
    authorizeOptions: BaseLoginOptions,
    state: string,
    nonce: string,
    code_challenge: string,
    redirect_uri: string
  ): AuthorizeOptions {
    // These options should be excluded from the authorize URL,
    // as they're options for the client and not for the IdP.
    // ** IMPORTANT ** If adding a new client option, include it in this destructure list.
    const {
      useRefreshTokens,
      useCookiesForTransactions,
      useFormData,
      auth0Client,
      cacheLocation,
      advancedOptions,
      detailedResponse,
      nowProvider,
      authorizeTimeoutInSeconds,
      legacySameSiteCookie,
      sessionCheckExpiryDays,
      domain,
      leeway,
      httpTimeoutInSeconds,
      endpoints,
      ...loginOptions
    } = this.options;

    return {
      ...loginOptions,
      ...authorizeOptions,
      scope: getUniqueScopes(
        this.defaultScope,
        this.scope,
        authorizeOptions.scope
      ),
      response_type: 'code',
      response_mode: 'query',
      state,
      nonce,
      redirect_uri: redirect_uri || this.options.redirect_uri,
      code_challenge,
      code_challenge_method: 'S256'
    };
  }

  private _authorizeUrl(authorizeOptions: AuthorizeOptions) {
    return this._url(`${this.endpoints.authorize}?${createQueryParams(authorizeOptions)}`);
  }

  private async _verifyIdToken(
    id_token: string,
    nonceIn?: string,
    organizationId?: string
  ) {
    const now = await this.nowProvider();
    const nonce = this.options.ignore_nonce ? undefined : nonceIn;

    return verifyIdToken({
      iss: this.tokenIssuer,
      aud: this.options.client_id,
      id_token,
      nonce,
      organizationId,
      leeway: this.options.leeway,
      max_age: this._parseNumber(this.options.max_age),
      now
    });
  }

  private _parseNumber(value: any): number {
    if (typeof value !== 'string') {
      return value;
    }
    return parseInt(value, 10) || undefined;
  }

  private _processOrgIdHint(organizationId?: string) {
    if (organizationId) {
      this.cookieStorage.save(this.orgHintCookieName, organizationId, {
        daysUntilExpire: this.sessionCheckExpiryDays,
        cookieDomain: this.options.cookieDomain
      });
    } else {
      this.cookieStorage.remove(this.orgHintCookieName);
    }
  }

  /**
   * ```js
   * await auth0.buildAuthorizeUrl(options);
   * ```
   *
   * Builds an `/authorize` URL for loginWithRedirect using the parameters
   * provided as arguments. Random and secure `state` and `nonce`
   * parameters will be auto-generated.
   *
   * @param options
   */
  public async buildAuthorizeUrl(
    options: RedirectLoginOptions = {}
  ): Promise<string> {
    const { redirect_uri, appState, ...authorizeOptions } = options;

    const stateIn = encode(createRandomString());
    const nonceIn = encode(createRandomString());
    const code_verifier = createRandomString();
    const code_challengeBuffer = await sha256(code_verifier);
    const code_challenge = bufferToBase64UrlEncoded(code_challengeBuffer);
    const fragment = options.fragment ? `#${options.fragment}` : '';

    const params = this._getParams(
      authorizeOptions,
      stateIn,
      nonceIn,
      code_challenge,
      redirect_uri
    );

    const url = this._authorizeUrl(params);
    const organizationId = options.organization || this.options.organization;

    this.transactionManager.create({
      nonce: nonceIn,
      code_verifier,
      appState,
      scope: params.scope,
      audience: params.audience || 'default',
      redirect_uri: params.redirect_uri,
      state: stateIn,
      ...(organizationId && { organizationId })
    });

    return url + fragment;
  }

  /**
   * ```js
   * try {
   *  await auth0.loginWithPopup(options);
   * } catch(e) {
   *  if (e instanceof PopupCancelledError) {
   *    // Popup was closed before login completed
   *  }
   * }
   * ```
   *
   * Opens a popup with the `/authorize` URL using the parameters
   * provided as arguments. Random and secure `state` and `nonce`
   * parameters will be auto-generated. If the response is successful,
   * results will be valid according to their expiration times.
   *
   * IMPORTANT: This method has to be called from an event handler
   * that was started by the user like a button click, for example,
   * otherwise the popup will be blocked in most browsers.
   *
   * @param options
   * @param config
   */
  public async loginWithPopup(
    options?: PopupLoginOptions,
    config?: PopupConfigOptions
  ) {
    options = options || {};
    config = config || {};

    if (!config.popup) {
      config.popup = openPopup('');

      if (!config.popup) {
        throw new Error(
          'Unable to open a popup for loginWithPopup - window.open returned `null`'
        );
      }
    }

    const { ...authorizeOptions } = options;
    const stateIn = encode(createRandomString());
    const nonceIn = encode(createRandomString());
    const code_verifier = createRandomString();
    const code_challengeBuffer = await sha256(code_verifier);
    const code_challenge = bufferToBase64UrlEncoded(code_challengeBuffer);

    const params = this._getParams(
      authorizeOptions,
      stateIn,
      nonceIn,
      code_challenge,
      this.options.redirect_uri || window.location.origin
    );

    const url = this._authorizeUrl({
      ...params,
      response_mode: 'web_message'
    });

    config.popup.location.href = url;

    const codeResult = await runPopup({
      ...config,
      timeoutInSeconds:
        config.timeoutInSeconds ||
        this.options.authorizeTimeoutInSeconds ||
        DEFAULT_AUTHORIZE_TIMEOUT_IN_SECONDS
    });

    if (stateIn !== codeResult.state) {
      throw new Error('Invalid state');
    }

    const authResult = await oauthToken(
      {
        audience: params.audience,
        scope: params.scope,
        baseUrl: this.domainUrl,
        endpoint: this.endpoints.token,
        client_id: this.options.client_id,
        code_verifier,
        code: codeResult.code,
        grant_type: 'authorization_code',
        redirect_uri: params.redirect_uri,
        auth0Client: this.options.auth0Client,
        useFormData: this.options.useFormData,
        timeout: this.httpTimeoutMs
      } as OAuthTokenOptions,
      this.worker
    );

    const organizationId = options.organization || this.options.organization;

    const decodedToken = await this._verifyIdToken(
      authResult.id_token,
      nonceIn,
      organizationId
    );

    const cacheEntry = {
      ...authResult,
      decodedToken,
      scope: params.scope,
      audience: params.audience || 'default',
      client_id: this.options.client_id
    };

    await this.cacheManager.set(cacheEntry);

    this.cookieStorage.save(this.isAuthenticatedCookieName, true, {
      daysUntilExpire: this.sessionCheckExpiryDays,
      cookieDomain: this.options.cookieDomain
    });

    this._processOrgIdHint(decodedToken.claims.org_id);
  }

  /**
   * ```js
   * const user = await auth0.getUser();
   * ```
   *
   * Returns the user information if available (decoded
   * from the `id_token`).
   *
   * If you provide an audience or scope, they should match an existing Access Token
   * (the SDK stores a corresponding ID Token with every Access Token, and uses the
   * scope and audience to look up the ID Token)
   *
   * @typeparam TUser The type to return, has to extend {@link User}.
   * @param options
   */
  public async getUser<TUser extends User>(
    options: GetUserOptions = {}
  ): Promise<TUser | undefined> {
    const audience = options.audience || this.options.audience || 'default';
    const scope = getUniqueScopes(this.defaultScope, this.scope, options.scope);

    const cache = await this.cacheManager.get(
      new CacheKey({
        client_id: this.options.client_id,
        audience,
        scope
      })
    );

    return cache && cache.decodedToken && (cache.decodedToken.user as TUser);
  }

  /**
   * ```js
   * const claims = await auth0.getIdTokenClaims();
   * ```
   *
   * Returns all claims from the id_token if available.
   *
   * If you provide an audience or scope, they should match an existing Access Token
   * (the SDK stores a corresponding ID Token with every Access Token, and uses the
   * scope and audience to look up the ID Token)
   *
   * @param options
   */
  public async getIdTokenClaims(
    options: GetIdTokenClaimsOptions = {}
  ): Promise<IdToken | undefined> {
    const audience = options.audience || this.options.audience || 'default';
    const scope = getUniqueScopes(this.defaultScope, this.scope, options.scope);

    const cache = await this.cacheManager.get(
      new CacheKey({
        client_id: this.options.client_id,
        audience,
        scope
      })
    );

    return cache && cache.decodedToken && cache.decodedToken.claims;
  }

  /**
   * ```js
   * await auth0.loginWithRedirect(options);
   * ```
   *
   * Performs a redirect to `/authorize` using the parameters
   * provided as arguments. Random and secure `state` and `nonce`
   * parameters will be auto-generated.
   *
   * @param options
   */
  public async loginWithRedirect<TAppState = any>(
    options: RedirectLoginOptions<TAppState> = {}
  ) {
    const { redirectMethod, ...urlOptions } = options;
    const url = await this.buildAuthorizeUrl(urlOptions);
    window.location[redirectMethod || 'assign'](url);
  }

  /**
   * After the browser redirects back to the callback page,
   * call `handleRedirectCallback` to handle success and error
   * responses from Auth0. If the response is successful, results
   * will be valid according to their expiration times.
   */
  public async handleRedirectCallback<TAppState = any>(
    url: string = window.location.href
  ): Promise<RedirectLoginResult<TAppState>> {
    const queryStringFragments = url.split('?').slice(1);

    if (queryStringFragments.length === 0) {
      throw new Error('There are no query params available for parsing.');
    }

    const { state, code, error, error_description } = parseQueryResult(
      queryStringFragments.join('')
    );

    const transaction = this.transactionManager.get();

    if (!transaction) {
      throw new Error('Invalid state');
    }

    this.transactionManager.remove();

    if (error) {
      throw new AuthenticationError(
        error,
        error_description,
        state,
        transaction.appState
      );
    }

    // Transaction should have a `code_verifier` to do PKCE for CSRF protection
    if (
      !transaction.code_verifier ||
      (transaction.state && transaction.state !== state)
    ) {
      throw new Error('Invalid state');
    }

    const tokenOptions = {
      audience: transaction.audience,
      scope: transaction.scope,
      baseUrl: this.domainUrl,
      endpoint: this.endpoints.token,
      client_id: this.options.client_id,
      code_verifier: transaction.code_verifier,
      grant_type: 'authorization_code',
      code,
      auth0Client: this.options.auth0Client,
      useFormData: this.options.useFormData,
      timeout: this.httpTimeoutMs
    } as OAuthTokenOptions;
    // some old versions of the SDK might not have added redirect_uri to the
    // transaction, we dont want the key to be set to undefined.
    if (undefined !== transaction.redirect_uri) {
      tokenOptions.redirect_uri = transaction.redirect_uri;
    }

    const authResult = await oauthToken(tokenOptions, this.worker);

    const decodedToken = await this._verifyIdToken(
      authResult.id_token,
      transaction.nonce,
      transaction.organizationId
    );

    await this.cacheManager.set({
      ...authResult,
      decodedToken,
      audience: transaction.audience,
      scope: transaction.scope,
      ...(authResult.scope ? { oauthTokenScope: authResult.scope } : null),
      client_id: this.options.client_id
    });

    this.cookieStorage.save(this.isAuthenticatedCookieName, true, {
      daysUntilExpire: this.sessionCheckExpiryDays,
      cookieDomain: this.options.cookieDomain
    });

    this._processOrgIdHint(decodedToken.claims.org_id);

    return {
      appState: transaction.appState
    };
  }

  /**
   * ```js
   * await auth0.checkSession();
   * ```
   *
   * Check if the user is logged in using `getTokenSilently`. The difference
   * with `getTokenSilently` is that this doesn't return a token, but it will
   * pre-fill the token cache.
   *
   * This method also heeds the `auth0.{clientId}.is.authenticated` cookie, as an optimization
   *  to prevent calling Auth0 unnecessarily. If the cookie is not present because
   * there was no previous login (or it has expired) then tokens will not be refreshed.
   *
   * It should be used for silently logging in the user when you instantiate the
   * `Auth0Client` constructor. You should not need this if you are using the
   * `createAuth0Client` factory.
   *
   * **Note:** the cookie **may not** be present if running an app using a private tab, as some
   * browsers clear JS cookie data and local storage when the tab or page is closed, or on page reload. This effectively
   * means that `checkSession` could silently return without authenticating the user on page refresh when
   * using a private tab, despite having previously logged in. As a workaround, use `getTokenSilently` instead
   * and handle the possible `login_required` error [as shown in the readme](https://github.com/auth0/auth0-spa-js#creating-the-client).
   *
   * @param options
   */
  public async checkSession(options?: GetTokenSilentlyOptions) {
    if (!this.cookieStorage.get(this.isAuthenticatedCookieName)) {
      if (!this.cookieStorage.get(OLD_IS_AUTHENTICATED_COOKIE_NAME)) {
        return;
      } else {
        // Migrate the existing cookie to the new name scoped by client ID
        this.cookieStorage.save(this.isAuthenticatedCookieName, true, {
          daysUntilExpire: this.sessionCheckExpiryDays,
          cookieDomain: this.options.cookieDomain
        });

        this.cookieStorage.remove(OLD_IS_AUTHENTICATED_COOKIE_NAME);
      }
    }

    try {
      await this.getTokenSilently(options);
    } catch (error) {
      if (!RECOVERABLE_ERRORS.includes(error.error)) {
        throw error;
      }
    }
  }

  /**
   * Fetches a new access token and returns the response from the /oauth/token endpoint, omitting the refresh token.
   *
   * @param options
   */
  public async getTokenSilently(
    options: GetTokenSilentlyOptions & { detailedResponse: true }
  ): Promise<GetTokenSilentlyVerboseResponse>;

  /**
   * Fetches a new access token and returns it.
   *
   * @param options
   */
  public async getTokenSilently(
    options?: GetTokenSilentlyOptions
  ): Promise<string>;

  /**
   * Fetches a new access token, and either returns just the access token (the default) or the response from the /oauth/token endpoint, depending on the `detailedResponse` option.
   *
   * ```js
   * const token = await auth0.getTokenSilently(options);
   * ```
   *
   * If there's a valid token stored and it has more than 60 seconds
   * remaining before expiration, return the token. Otherwise, attempt
   * to obtain a new token.
   *
   * A new token will be obtained either by opening an iframe or a
   * refresh token (if `useRefreshTokens` is `true`)

   * If iframes are used, opens an iframe with the `/authorize` URL
   * using the parameters provided as arguments. Random and secure `state`
   * and `nonce` parameters will be auto-generated. If the response is successful,
   * results will be validated according to their expiration times.
   *
   * If refresh tokens are used, the token endpoint is called directly with the
   * 'refresh_token' grant. If no refresh token is available to make this call,
   * the SDK falls back to using an iframe to the '/authorize' URL.
   *
   * This method may use a web worker to perform the token call if the in-memory
   * cache is used.
   *
   * If an `audience` value is given to this function, the SDK always falls
   * back to using an iframe to make the token exchange.
   *
   * Note that in all cases, falling back to an iframe requires access to
   * the `auth0` cookie.
   *
   * @param options
   */
  public async getTokenSilently(
    options: GetTokenSilentlyOptions = {}
  ): Promise<string | GetTokenSilentlyVerboseResponse> {
    const { ignoreCache, ...getTokenOptions } = {
      audience: this.options.audience,
      ignoreCache: false,
      ...options,
      scope: getUniqueScopes(this.defaultScope, this.scope, options.scope)
    };

    return singlePromise(
      () =>
        this._getTokenSilently({
          ignoreCache,
          ...getTokenOptions
        }),
      `${this.options.client_id}::${getTokenOptions.audience}::${getTokenOptions.scope}`
    );
  }

  private async _getTokenSilently(
    options: GetTokenSilentlyOptions = {}
  ): Promise<string | GetTokenSilentlyVerboseResponse> {
    const { ignoreCache, ...getTokenOptions } = options;

    // Check the cache before acquiring the lock to avoid the latency of
    // `lock.acquireLock` when the cache is populated.
    if (!ignoreCache) {
      const entry = await this._getEntryFromCache({
        scope: getTokenOptions.scope,
        audience: getTokenOptions.audience || 'default',
        client_id: this.options.client_id,
        getDetailedEntry: options.detailedResponse
      });

      if (entry) {
        return entry;
      }
    }

    if (
      await retryPromise(
        () => lock.acquireLock(GET_TOKEN_SILENTLY_LOCK_KEY, 5000),
        10
      )
    ) {
      try {
        // Check the cache a second time, because it may have been populated
        // by a previous call while this call was waiting to acquire the lock.
        if (!ignoreCache) {
          const entry = await this._getEntryFromCache({
            scope: getTokenOptions.scope,
            audience: getTokenOptions.audience || 'default',
            client_id: this.options.client_id,
            getDetailedEntry: options.detailedResponse
          });

          if (entry) {
            return entry;
          }
        }

        const authResult = this.options.useRefreshTokens
          ? await this._getTokenUsingRefreshToken(getTokenOptions)
          : await this._getTokenFromIFrame(getTokenOptions);

        await this.cacheManager.set({
          client_id: this.options.client_id,
          ...authResult
        });

        this.cookieStorage.save(this.isAuthenticatedCookieName, true, {
          daysUntilExpire: this.sessionCheckExpiryDays,
          cookieDomain: this.options.cookieDomain
        });

        if (options.detailedResponse) {
          const { id_token, access_token, oauthTokenScope, expires_in } =
            authResult;

          return {
            id_token,
            access_token,
            ...(oauthTokenScope ? { scope: oauthTokenScope } : null),
            expires_in
          };
        }

        return authResult.access_token;
      } finally {
        await lock.releaseLock(GET_TOKEN_SILENTLY_LOCK_KEY);
      }
    } else {
      throw new TimeoutError();
    }
  }

  /**
   * ```js
   * const token = await auth0.getTokenWithPopup(options);
   * ```
   * Opens a popup with the `/authorize` URL using the parameters
   * provided as arguments. Random and secure `state` and `nonce`
   * parameters will be auto-generated. If the response is successful,
   * results will be valid according to their expiration times.
   *
   * @param options
   * @param config
   */
  public async getTokenWithPopup(
    options: GetTokenWithPopupOptions = {},
    config: PopupConfigOptions = {}
  ) {
    options.audience = options.audience || this.options.audience;

    options.scope = getUniqueScopes(
      this.defaultScope,
      this.scope,
      options.scope
    );

    config = {
      ...DEFAULT_POPUP_CONFIG_OPTIONS,
      ...config
    };

    await this.loginWithPopup(options, config);

    const cache = await this.cacheManager.get(
      new CacheKey({
        scope: options.scope,
        audience: options.audience || 'default',
        client_id: this.options.client_id
      })
    );

    return cache.access_token;
  }

  /**
   * ```js
   * const isAuthenticated = await auth0.isAuthenticated();
   * ```
   *
   * Returns `true` if there's valid information stored,
   * otherwise returns `false`.
   *
   */
  public async isAuthenticated() {
    const user = await this.getUser();
    return !!user;
  }

  /**
   * ```js
   * await auth0.buildLogoutUrl(options);
   * ```
   *
   * Builds a URL to the logout endpoint using the parameters provided as arguments.
   * @param options
   */
  public buildLogoutUrl(options: LogoutUrlOptions = {}): string {
    if (options.client_id !== null) {
      options.client_id = options.client_id || this.options.client_id;
    } else {
      delete options.client_id;
    }

    const { federated, ...logoutOptions } = options;
    const federatedQuery = federated ? `&federated` : '';
    const url = this._url(`${this.endpoints.logout}?${createQueryParams(logoutOptions)}`);

    return url + federatedQuery;
  }

  /**
   * ```js
   * auth0.logout();
   * ```
   *
   * Clears the application session and performs a redirect to `/v2/logout`, using
   * the parameters provided as arguments, to clear the Auth0 session.
   *
   * **Note:** If you are using a custom cache, and specifying `localOnly: true`, and you want to perform actions or read state from the SDK immediately after logout, you should `await` the result of calling `logout`.
   *
   * If the `federated` option is specified it also clears the Identity Provider session.
   * If the `localOnly` option is specified, it only clears the application session.
   * It is invalid to set both the `federated` and `localOnly` options to `true`,
   * and an error will be thrown if you do.
   * [Read more about how Logout works at Auth0](https://auth0.com/docs/logout).
   *
   * @param options
   */
  public logout(options: LogoutOptions = {}): Promise<void> | void {
    const { localOnly, ...logoutOptions } = options;

    if (localOnly && logoutOptions.federated) {
      throw new Error(
        'It is invalid to set both the `federated` and `localOnly` options to `true`'
      );
    }

    const postCacheClear = () => {
      this.cookieStorage.remove(this.orgHintCookieName);
      this.cookieStorage.remove(this.isAuthenticatedCookieName);

      if (localOnly) {
        return;
      }

      const url = this.buildLogoutUrl(logoutOptions);

      window.location.assign(url);
    };

    if (this.options.cache) {
      return this.cacheManager.clear().then(() => postCacheClear());
    } else {
      this.cacheManager.clearSync();
      postCacheClear();
    }
  }

  private async _getTokenFromIFrame(
    options: GetTokenSilentlyOptions
  ): Promise<GetTokenSilentlyResult> {
    const stateIn = encode(createRandomString());
    const nonceIn = encode(createRandomString());
    const code_verifier = createRandomString();
    const code_challengeBuffer = await sha256(code_verifier);
    const code_challenge = bufferToBase64UrlEncoded(code_challengeBuffer);

    const { detailedResponse, ...withoutClientOptions } = options;

    const params = this._getParams(
      withoutClientOptions,
      stateIn,
      nonceIn,
      code_challenge,
      options.redirect_uri ||
        this.options.redirect_uri ||
        window.location.origin
    );

    const orgIdHint = this.cookieStorage.get<string>(this.orgHintCookieName);

    if (orgIdHint && !params.organization) {
      params.organization = orgIdHint;
    }

    const url = this._authorizeUrl({
      ...params,
      prompt: 'none',
      response_mode: 'web_message'
    });

    try {
      // When a browser is running in a Cross-Origin Isolated context, using iframes is not possible.
      // It doesn't throw an error but times out instead, so we should exit early and inform the user about the reason.
      // https://developer.mozilla.org/en-US/docs/Web/API/crossOriginIsolated
      if ((window as any).crossOriginIsolated) {
        throw new GenericError(
          'login_required',
          'The application is running in a Cross-Origin Isolated context, silently retrieving a token without refresh token is not possible.'
        );
      }

      const authorizeTimeout =
        options.timeoutInSeconds || this.options.authorizeTimeoutInSeconds;

      const codeResult = await runIframe(url, this.domainUrl, authorizeTimeout);

      if (stateIn !== codeResult.state) {
        throw new Error('Invalid state');
      }

      const {
        scope,
        audience,
        redirect_uri,
        ignoreCache,
        timeoutInSeconds,
        detailedResponse,
        ...customOptions
      } = options;

      const tokenResult = await oauthToken(
        {
          ...this.customOptions,
          ...customOptions,
          scope,
          audience,
          baseUrl: this.domainUrl,
          endpoint: this.endpoints.token,
          client_id: this.options.client_id,
          code_verifier,
          code: codeResult.code,
          grant_type: 'authorization_code',
          redirect_uri: params.redirect_uri,
          auth0Client: this.options.auth0Client,
          useFormData: this.options.useFormData,
          timeout: customOptions.timeout || this.httpTimeoutMs
        } as OAuthTokenOptions,
        this.worker
      );

      const decodedToken = await this._verifyIdToken(
        tokenResult.id_token,
        nonceIn
      );

      this._processOrgIdHint(decodedToken.claims.org_id);

      return {
        ...tokenResult,
        decodedToken,
        scope: params.scope,
        oauthTokenScope: tokenResult.scope,
        audience: params.audience || 'default'
      };
    } catch (e) {
      if (e.error === 'login_required') {
        this.logout({
          localOnly: true
        });
      }
      throw e;
    }
  }

  private async _getTokenUsingRefreshToken(
    options: GetTokenSilentlyOptions
  ): Promise<GetTokenSilentlyResult> {
    options.scope = getUniqueScopes(
      this.defaultScope,
      this.options.scope,
      options.scope
    );

    const cache = await this.cacheManager.get(
      new CacheKey({
        scope: options.scope,
        audience: options.audience || 'default',
        client_id: this.options.client_id
      })
    );

    // If you don't have a refresh token in memory
    // and you don't have a refresh token in web worker memory
    // fallback to an iframe.
    if ((!cache || !cache.refresh_token) && !this.worker) {
      return await this._getTokenFromIFrame(options);
    }

    const redirect_uri =
      options.redirect_uri ||
      this.options.redirect_uri ||
      window.location.origin;

    let tokenResult: TokenEndpointResponse;

    const {
      scope,
      audience,
      ignoreCache,
      timeoutInSeconds,
      detailedResponse,
      ...customOptions
    } = options;

    const timeout =
      typeof options.timeoutInSeconds === 'number'
        ? options.timeoutInSeconds * 1000
        : null;

    try {
      tokenResult = await oauthToken(
        {
          ...this.customOptions,
          ...customOptions,
          audience,
          scope,
          baseUrl: this.domainUrl,
          endpoint: this.endpoints.token,
          client_id: this.options.client_id,
          grant_type: 'refresh_token',
          refresh_token: cache && cache.refresh_token,
          redirect_uri,
          ...(timeout && { timeout }),
          auth0Client: this.options.auth0Client,
          useFormData: this.options.useFormData,
          timeout: this.httpTimeoutMs
        } as RefreshTokenOptions,
        this.worker
      );
    } catch (e) {
      if (
        // The web worker didn't have a refresh token in memory so
        // fallback to an iframe.
        e.message === MISSING_REFRESH_TOKEN_ERROR_MESSAGE ||
        // A refresh token was found, but is it no longer valid.
        // Fallback to an iframe.
        (e.message &&
          e.message.indexOf(INVALID_REFRESH_TOKEN_ERROR_MESSAGE) > -1)
      ) {
        return await this._getTokenFromIFrame(options);
      }

      throw e;
    }

    const decodedToken = await this._verifyIdToken(tokenResult.id_token);

    return {
      ...tokenResult,
      decodedToken,
      scope: options.scope,
      oauthTokenScope: tokenResult.scope,
      audience: options.audience || 'default'
    };
  }

  private async _getEntryFromCache({
    scope,
    audience,
    client_id,
    getDetailedEntry = false
  }: {
    scope: string;
    audience: string;
    client_id: string;
    getDetailedEntry?: boolean;
  }) {
    const entry = await this.cacheManager.get(
      new CacheKey({
        scope,
        audience,
        client_id
      }),
      60 // get a new token if within 60 seconds of expiring
    );

    if (entry && entry.access_token) {
      if (getDetailedEntry) {
        const { id_token, access_token, oauthTokenScope, expires_in } = entry;

        return {
          id_token,
          access_token,
          ...(oauthTokenScope ? { scope: oauthTokenScope } : null),
          expires_in
        };
      }

      return entry.access_token;
    }
  }
}