angular-aap-auth
Version:
## This library is deprecated. Please, use [ng-ebi-authorization](https://www.npmjs.com/package/ng-ebi-authorization).
506 lines (498 loc) • 47.8 kB
JavaScript
import { Injectable, InjectionToken, Inject, RendererFactory2, NgModule, Optional, SkipSelf } from '@angular/core';
import { JwtHelperService } from '@auth0/angular-jwt';
import { BehaviorSubject } from 'rxjs';
import { map } from 'rxjs/operators';
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
/**
* The purpose of this very simple service is to interface between the
* AuthService and the specific token manipulation routing of JwtHelperService.
* In this way, if in the future we want to replace JwtHelperService by
* another service, AuthService doesn't need to be modified, only this service.
*/
class TokenService {
/**
* @param {?} _jwt
*/
constructor(_jwt) {
this._jwt = _jwt;
}
/**
* @return {?}
*/
getToken() {
return this._jwt.tokenGetter();
}
/**
* @return {?}
*/
getTokenExpirationDate() {
try {
return this._jwt.getTokenExpirationDate();
}
catch (/** @type {?} */ e) {
return null;
}
}
/**
* @return {?}
*/
isTokenValid() {
try {
return !this._jwt.isTokenExpired();
}
catch (/** @type {?} */ error) {
return false;
}
}
/**
* Get claims from the token.
*
* @template T, C
* @param {?} claim The name of the claim
* @param {?} defaultValue The default value returned in case of error
*
* @return {?} claim or default value
*/
getClaim(claim, defaultValue) {
try {
const /** @type {?} */ value = /** @type {?} */ (this._jwt.decodeToken()[claim]);
if (value === undefined) {
return defaultValue;
}
return value;
}
catch (/** @type {?} */ e) {
return defaultValue;
}
}
}
TokenService.decorators = [
{ type: Injectable },
];
/** @nocollapse */
TokenService.ctorParameters = () => [
{ type: JwtHelperService }
];
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
const /** @type {?} */ AAP_CONFIG = new InjectionToken('AAP_CONFIG');
/**
* @return {?}
*/
function getToken() {
return localStorage.getItem('id_token') || '';
}
/**
* @return {?}
*/
function removeToken() {
return localStorage.removeItem('id_token');
}
/**
* @param {?} newToken
* @return {?}
*/
function updateToken(newToken) {
return localStorage.setItem('id_token', newToken);
}
const /** @type {?} */ DEFAULT_CONF = {
aapURL: 'https://api.aai.ebi.ac.uk',
tokenGetter: getToken,
tokenRemover: removeToken,
tokenUpdater: updateToken
};
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
class AuthService {
/**
* @param {?} _rendererFactory
* @param {?} _tokenService
* @param {?} config
*/
constructor(_rendererFactory, _tokenService, config) {
this._rendererFactory = _rendererFactory;
this._tokenService = _tokenService;
this.config = config;
this._credentials = new BehaviorSubject(null);
this._loginCallbacks = [];
this._logoutCallbacks = [];
this._timeoutID = null;
this._commKeyName = 'AngularAapAuthUpdated';
this._commKeyUpdater = () => localStorage.setItem(this._commKeyName, '' + new Date().getTime());
this._domain = encodeURIComponent(window.location.origin);
this._appURL = config.aapURL.replace(/\/$/, '');
this._storageUpdater = config.tokenUpdater;
if (config.tokenRemover) {
this._storageRemover = config.tokenRemover;
}
else {
this._storageRemover = () => config.tokenUpdater(null);
}
const /** @type {?} */ renderer = this._rendererFactory.createRenderer(null, null);
this._listenLoginMessage(renderer);
this._listenChangesFromOtherWindows(renderer);
this._updateCredentials(); // TODO: experiment with setTimeOut
}
/**
* @return {?}
*/
isAuthenticated() {
return this._credentials.asObservable().pipe(map(credentials => credentials ? true : false));
}
/**
* @return {?}
*/
credentials() {
return this._credentials.asObservable();
}
/**
* @return {?}
*/
realname() {
return this._credentials.asObservable().pipe(map(credentials => credentials ? credentials.realname : null));
}
/**
* @return {?}
*/
username() {
return this._credentials.asObservable().pipe(map(credentials => credentials ? credentials.username : null));
}
/**
* @return {?}
*/
token() {
return this._credentials.asObservable().pipe(map(credentials => credentials ? credentials.token : null));
}
/**
* Functions that opens a window instead of a tab.
*
* See method _filterLoginOptions regarding security risks of certain
* LoginOptions.
*
* @param {?=} loginOptions Options passed as URL parameters to the SSO.
* @param {?=} width Pixel width of the login window.
* @param {?=} height Pixel height of the login window.
* @param {?=} top Position of the top corners. If it is a negative
* number it centres the login window on the screen.
* @param {?=} left Position of the left corners. If it is a negative
* number it centres the login window on the screen.
* @return {?}
*/
windowOpen(loginOptions, width = 650, height = 1000, top = -1, left = -1) {
if (left < 0) {
const /** @type {?} */ screenWidth = screen.width;
if (screenWidth > width) {
left = Math.round(screenWidth / 2 - width / 2);
}
}
if (top < 0) {
const /** @type {?} */ screenHeight = screen.height;
if (screenHeight > height) {
top = Math.round(screenHeight / 2 - height / 2);
}
}
const /** @type {?} */ windowOptions = [
`width=${width}`,
`height=${height}`,
`left=${left}`,
`top=${top}`,
'personalbar=no',
'toolbar=no',
'scrollbars=yes',
'resizable=yes',
'directories=no',
'location=no',
'menubar=no',
'titlebar=no',
'toolbar=no'
];
const /** @type {?} */ loginWindow = window.open(this.getSSOURL(loginOptions), 'Sign in to Elixir', windowOptions.join(','));
if (loginWindow) {
loginWindow.focus();
}
}
/**
* Functions that opens a tab (in modern browser).
*
* See method _filterLoginOptions regarding security risks of certain
* LoginOptions.
*
* @param {?=} loginOptions Options passed as URL parameters to the SSO.
* @return {?}
*/
tabOpen(loginOptions) {
const /** @type {?} */ loginWindow = window.open(this.getSSOURL(loginOptions), 'Sign in to Elixir');
if (loginWindow) {
loginWindow.focus();
}
}
/**
* Produces a URL that allows logging into the single sign on (SSO) page.
* The URL cans be opened in a new tab using target="_blank",
* or in a new window using window.open().
*
* See method _filterLoginOptions regarding security risks of certain
* LoginOptions.
*
* @param {?=} options
* @return {?} The SSO URL.
*
*/
getSSOURL(options) {
let /** @type {?} */ extra = '';
if (options) {
this._filterLoginOptions(options);
extra = Object.keys(options)
.map(key => [key, options[key]])
.reduce((accumulator, keyvalue) => `${accumulator}&${keyvalue[0]}=${keyvalue[1]}`, '');
}
return `${this._appURL}/sso?from=${this._domain}${extra}`;
}
/**
* Filters options that are unsecure.
*
* See the advance options that can be requested through the options parameter:
* https://api.aai.ebi.ac.uk/docs/authentication/authentication.index.html#_common_attributes
*
* The time to live paramenter (ttl) default value is 60 minutes. It is a
* big security risk to request longer ttl. If a third party gets hold of
* such token, means that they could use it for a day, week, year
* (essentially, like having the username/password).
*
* @param {?} options
* @return {?}
*/
_filterLoginOptions(options) {
if (Object.keys(options).indexOf('ttl') > -1) {
const /** @type {?} */ ttl = +options['ttl'];
const /** @type {?} */ softLimit = 60;
const /** @type {?} */ hardLimit = 60 * 24;
if (ttl > hardLimit) {
window.console.error(`Login requested with an expiration longer than ${hardLimit} minutes! This is not allowed.`);
window.console.error(`Expiration request reset to ${hardLimit} minutes.`);
options['ttl'] = '' + hardLimit;
}
else if (ttl > softLimit) {
window.console.warn(`Login requested with an expiration longer than ${softLimit} minutes!`);
}
}
}
/**
* Functions that logs out the user.
* It triggers the logout callbacks.
* It is an arrow function (lambda) because in that way it has a reference
* to 'this' when used in setTimeout call.
* @return {?}
*/
logOut() {
this._storageRemover();
this._updateCredentials();
// Triggers updating other windows
this._commKeyUpdater();
}
/**
* Add a callback to the LogIn event.
*
* @param {?} callback The Function called when the login event is triggered and the
* JWT token is received and accepted.
*
* @return {?} The event registration id (necessary to unregister the event).
*/
addLogInEventListener(callback) {
return this._loginCallbacks.push(callback);
}
/**
* Remove a callback from the LogIn event.
*
* @param {?} id The id given when event listener was added.
*
* @return {?} true when remove successfully, false otherwise.
*/
removeLogInEventListener(id) {
return delete this._loginCallbacks[id - 1];
}
/**
* Add a callback to the LogOut event.
*
* @param {?} callback The Function called when the logout event is triggered and the
* JWT token is received and accepted.
*
* @return {?} The registration id (necessary to unregister the event).
*/
addLogOutEventListener(callback) {
return this._logoutCallbacks.push(callback);
}
/**
* Remove a callback from the LogOut event.
*
* @param {?} id The id given when event listener was added.
*
* @return {?} true when remove successfully, false otherwise.
*/
removeLogOutEventListener(id) {
return delete this._logoutCallbacks[id - 1];
}
/**
* Listen for login messages from other windows.
* These messages contain the tokens from the AAP.
* If a token is received then the callbacks are triggered.
* @param {?} renderer
* @return {?}
*/
_listenLoginMessage(renderer) {
renderer.listen('window', 'message', (event) => {
if (!this.messageIsAcceptable(event)) {
return;
}
this._storageUpdater(event.data);
event.source.close();
this._updateCredentials();
// Triggers updating other windows
this._commKeyUpdater();
});
}
/**
* Listen to changes in the token from *other* windows.
*
* For inter-window communication messages are transmitted trough changes
* on a dummy storage key property: '_commKeyName'.
*
* Notice that changes in the '_commKeyName' produced by this class doesn't
* trigger this event.
* @param {?} renderer
* @return {?}
*/
_listenChangesFromOtherWindows(renderer) {
renderer.listen('window', 'storage', (event) => {
if (event.key === this._commKeyName) {
this._updateCredentials();
}
});
}
/**
* Check if the message is coming from the same domain we use to generate
* the SSO URL, otherwise it's iffy and shouldn't trust it.
* @param {?} event
* @return {?}
*/
messageIsAcceptable(event) {
return event.origin === this._appURL;
}
/**
* @return {?}
*/
_updateCredentials() {
const /** @type {?} */ isAuthenticated = this._loggedIn();
if (this._timeoutID) {
window.clearTimeout(this._timeoutID);
}
if (isAuthenticated) {
this._credentials.next({
realname: /** @type {?} */ (this._getRealName()),
username: /** @type {?} */ (this._getUserName()),
token: /** @type {?} */ (this._getToken())
});
this._loginCallbacks.map(callback => callback && callback());
// Schedule future logout event base on token expiration
const /** @type {?} */ expireDate = /** @type {?} */ (this._tokenService.getTokenExpirationDate());
// Coercing dates to numbers with the unary operator '+'
const /** @type {?} */ delay = +expireDate - +new Date();
this._timeoutID = window.setTimeout(() => this.logOut(), delay);
}
else {
this._storageRemover(); // Cleanup possible left behind token
this._credentials.next(null);
this._logoutCallbacks.map(callback => callback && callback());
}
}
/**
* Check if there's a user logging on and whether the token is still valid.
*
* @return {?} Whether the user user is authenticated or not.
*/
_loggedIn() {
return this._tokenService.isTokenValid();
}
/**
* @return {?}
*/
_getToken() {
return this._tokenService.getToken();
}
/**
* @return {?}
*/
_getUserName() {
return this._tokenService.getClaim('email', null);
}
/**
* @return {?}
*/
_getRealName() {
return this._tokenService.getClaim('name', null);
}
}
AuthService.decorators = [
{ type: Injectable },
];
/** @nocollapse */
AuthService.ctorParameters = () => [
{ type: RendererFactory2 },
{ type: TokenService },
{ type: undefined, decorators: [{ type: Inject, args: [AAP_CONFIG,] }] }
];
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
class AuthModule {
/**
* @param {?} parentModule
*/
constructor(parentModule) {
if (parentModule) {
throw new Error('AuthModule is already loaded. It should only be imported in your application\'s main module.');
}
}
/**
* @param {?=} options
* @return {?}
*/
static forRoot(options) {
return {
ngModule: AuthModule,
providers: [
TokenService,
{
provide: AAP_CONFIG,
useValue: options ? options : DEFAULT_CONF
},
AuthService
]
};
}
}
AuthModule.decorators = [
{ type: NgModule, args: [{},] },
];
/** @nocollapse */
AuthModule.ctorParameters = () => [
{ type: AuthModule, decorators: [{ type: Optional }, { type: SkipSelf }] }
];
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
export { AuthModule, AuthService, TokenService, AAP_CONFIG as ɵb, DEFAULT_CONF as ɵf, getToken as ɵc, removeToken as ɵd, updateToken as ɵe };
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"angular-aap-auth.js.map","sources":["ng://angular-aap-auth/app/modules/auth/token.service.ts","ng://angular-aap-auth/app/modules/auth/auth.config.ts","ng://angular-aap-auth/app/modules/auth/auth.service.ts","ng://angular-aap-auth/app/modules/auth/auth.module.ts"],"sourcesContent":["import {\n    Injectable\n} from '@angular/core';\n\nimport {\n    JwtHelperService\n} from '@auth0/angular-jwt';\n\n/**\n * The purpose of this very simple service is to interface between the\n * AuthService and the specific token manipulation routing of JwtHelperService.\n * In this way, if in the future we want to replace JwtHelperService by\n * another service, AuthService doesn't need to be modified, only this service.\n */\n@Injectable()\nexport class TokenService {\n\n    constructor(\n        private _jwt: JwtHelperService\n    ) {}\n\n    public getToken(): string | null {\n        return this._jwt.tokenGetter();\n    }\n\n    public getTokenExpirationDate(): Date | null {\n        try {\n            return this._jwt.getTokenExpirationDate();\n        } catch (e) {\n            return null;\n        }\n    }\n\n    public isTokenValid(): boolean {\n        try {\n            return !this._jwt.isTokenExpired();\n        } catch (error) {\n            return false;\n        }\n    }\n\n    /**\n     * Get claims from the token.\n     *\n     * @param claim The name of the claim\n     * @param defaultValue The default value returned in case of error\n     *\n     * @returns claim or default value\n     */\n    public getClaim < T, C > (claim: string, defaultValue: C): T | C {\n        try {\n            const value = < T > this._jwt.decodeToken()[claim];\n            if (value === undefined) {\n                return defaultValue;\n            }\n            return value;\n        } catch (e) {\n            return defaultValue;\n        }\n    }\n}\n","import {\n    InjectionToken\n} from '@angular/core';\n\nexport interface AuthConfig {\n    aapURL: string;\n    tokenGetter: () => string;\n    tokenRemover?: () => void;\n    tokenUpdater: (newToken: any) => void;\n}\n\nexport const AAP_CONFIG = new InjectionToken < AuthConfig > ('AAP_CONFIG');\n\nexport function getToken(): string {\n    return localStorage.getItem('id_token') || '';\n}\nexport function removeToken(): void {\n    return localStorage.removeItem('id_token');\n}\nexport function updateToken(newToken: string): void {\n    return localStorage.setItem('id_token', newToken);\n}\nexport const DEFAULT_CONF: AuthConfig = {\n    aapURL: 'https://api.aai.ebi.ac.uk',\n    tokenGetter: getToken,\n    tokenRemover: removeToken,\n    tokenUpdater: updateToken\n};\n","import {\n    Injectable,\n    Inject,\n    RendererFactory2,\n    Renderer2\n} from '@angular/core';\nimport {\n    Observable\n} from 'rxjs';\nimport {\n    BehaviorSubject,\n} from 'rxjs';\nimport {\n    map\n} from 'rxjs/operators';\n\nimport {\n    AAP_CONFIG,\n    AuthConfig\n} from './auth.config';\nimport {\n    TokenService\n} from './token.service';\n\nexport interface LoginOptions {\n    [key: string]: string;\n}\n\nexport interface Credentials {\n    realname: string;\n    username: string;\n    token: string;\n}\n\n@Injectable()\nexport class AuthService {\n\n    private _credentials = new BehaviorSubject < Credentials | null > (null);\n\n    private _loginCallbacks: Function[] = [];\n    private _logoutCallbacks: Function[] = [];\n\n    private _timeoutID: number | null = null;\n\n    // Configuration\n    private readonly _domain: string;\n    private readonly _appURL: string;\n    private readonly _storageUpdater: (newToken: any) => void;\n    private readonly _storageRemover: () => void;\n\n    // This two properties are used for inter-window communcation.\n    // It is achieve through the update of the dummy key storage '_commKeyName'\n    private readonly _commKeyName = 'AngularAapAuthUpdated';\n    private readonly _commKeyUpdater = () => localStorage.setItem(this._commKeyName, '' + new Date().getTime());\n\n    constructor(\n        private _rendererFactory: RendererFactory2,\n        private _tokenService: TokenService,\n        @Inject(AAP_CONFIG) private config: AuthConfig\n    ) {\n        this._domain = encodeURIComponent(window.location.origin);\n        this._appURL = config.aapURL.replace(/\\/$/, '');\n        this._storageUpdater = config.tokenUpdater;\n        if (config.tokenRemover) {\n            this._storageRemover = config.tokenRemover;\n        } else {\n            this._storageRemover = () => config.tokenUpdater(null);\n        }\n\n        const renderer = this._rendererFactory.createRenderer(null, null);\n        this._listenLoginMessage(renderer);\n        this._listenChangesFromOtherWindows(renderer);\n\n        this._updateCredentials(); // TODO: experiment with setTimeOut\n    }\n\n    public isAuthenticated(): Observable < boolean > {\n        return this._credentials.asObservable().pipe(\n            map(credentials => credentials ? true : false)\n        );\n    }\n\n    public credentials(): Observable < Credentials | null > {\n        return this._credentials.asObservable();\n    }\n\n    public realname(): Observable < string | null > {\n        return this._credentials.asObservable().pipe(\n            map(credentials => credentials ?  credentials.realname : null)\n        );\n    }\n\n    public username(): Observable < string | null > {\n        return this._credentials.asObservable().pipe(\n            map(credentials => credentials ?  credentials.username : null)\n        );\n    }\n\n    public token(): Observable < string | null > {\n        return this._credentials.asObservable().pipe(\n            map(credentials => credentials ?  credentials.token : null)\n        );\n    }\n\n    /**\n     * Functions that opens a window instead of a tab.\n     *\n     * See method _filterLoginOptions regarding security risks of certain\n     * LoginOptions.\n     *\n     * @param loginOptions Options passed as URL parameters to the SSO.\n     * @param width Pixel width of the login window.\n     * @param height Pixel height of the login window.\n     * @param top Position of the top corners. If it is a negative\n     *             number it centres the login window on the screen.\n     * @param left Position of the left corners. If it is a negative\n     *             number it centres the login window on the screen.\n     */\n    public windowOpen(loginOptions?: LoginOptions, width = 650, height = 1000, top = -1, left = -1) {\n        if (left < 0) {\n            const screenWidth = screen.width;\n            if (screenWidth > width) {\n                left = Math.round(screenWidth / 2 - width / 2);\n            }\n        }\n        if (top < 0) {\n            const screenHeight = screen.height;\n            if (screenHeight > height) {\n                top = Math.round(screenHeight / 2 - height / 2);\n            }\n        }\n\n        const windowOptions = [\n            `width=${width}`,\n            `height=${height}`,\n            `left=${left}`,\n            `top=${top}`,\n            'personalbar=no',\n            'toolbar=no',\n            'scrollbars=yes',\n            'resizable=yes',\n            'directories=no',\n            'location=no',\n            'menubar=no',\n            'titlebar=no',\n            'toolbar=no'\n        ];\n\n        const loginWindow = window.open(this.getSSOURL(loginOptions), 'Sign in to Elixir', windowOptions.join(','));\n        if (loginWindow) {\n            loginWindow.focus();\n        }\n    }\n\n    /**\n     * Functions that opens a tab (in modern browser).\n     *\n     * See method _filterLoginOptions regarding security risks of certain\n     * LoginOptions.\n     *\n     * @param loginOptions Options passed as URL parameters to the SSO.\n     */\n    public tabOpen(loginOptions?: LoginOptions) {\n        const loginWindow = window.open(this.getSSOURL(loginOptions), 'Sign in to Elixir');\n        if (loginWindow) {\n            loginWindow.focus();\n        }\n    }\n\n    /**\n     * Produces a URL that allows logging into the single sign on (SSO) page.\n     * The URL cans be opened in a new tab using target=\"_blank\",\n     * or in a new window using window.open().\n     *\n     * See method _filterLoginOptions regarding security risks of certain\n     * LoginOptions.\n     *\n     * @param  loginOptions Options passed as URL parameters to the SSO.\n     *\n     * @returns The SSO URL.\n     *\n     */\n        public getSSOURL(options?: LoginOptions): string {\n        let extra = '';\n        if (options) {\n            this._filterLoginOptions(options);\n            extra = Object.keys(options)\n                .map(key => [key, options[key]])\n                .reduce((accumulator, keyvalue) => `${accumulator}&${keyvalue[0]}=${keyvalue[1]}`, '');\n        }\n        return `${this._appURL}/sso?from=${this._domain}${extra}`;\n    }\n\n    /**\n     * Filters options that are unsecure.\n     *\n     * See the advance options that can be requested through the options parameter:\n     * https://api.aai.ebi.ac.uk/docs/authentication/authentication.index.html#_common_attributes\n     *\n     * The time to live paramenter (ttl) default value is 60 minutes. It is a\n     * big security risk to request longer ttl. If a third party gets hold of\n     * such token, means that they could use it for a day, week, year\n     * (essentially, like having the username/password).\n     *\n     * @param  loginOptions Options passed as URL parameters to the SSO.\n     *\n     *\n     */\n    public _filterLoginOptions(options: LoginOptions) {\n        if (Object.keys(options).indexOf('ttl') > -1) {\n            const ttl: number = +options['ttl'];\n            const softLimit = 60;\n            const hardLimit = 60 * 24;\n            if (ttl > hardLimit) {\n                window.console.error(`Login requested with an expiration longer than ${hardLimit} minutes! This is not allowed.`);\n                window.console.error(`Expiration request reset to ${hardLimit} minutes.`);\n                options['ttl'] = '' + hardLimit;\n            } else if (ttl > softLimit) {\n                window.console.warn(`Login requested with an expiration longer than ${softLimit} minutes!`);\n            }\n        }\n    }\n\n    /**\n     * Functions that logs out the user.\n     * It triggers the logout callbacks.\n     * It is an arrow function (lambda) because in that way it has a reference\n     * to 'this' when used in setTimeout call.\n     */\n    public logOut() {\n        this._storageRemover();\n        this._updateCredentials();\n\n        // Triggers updating other windows\n        this._commKeyUpdater();\n    }\n\n    /**\n     * Add a callback to the LogIn event.\n     *\n     * @param callback The Function called when the login event is triggered and the\n     *    JWT token is received and accepted.\n     *\n     * @returns The event registration id (necessary to unregister the event).\n     */\n    public addLogInEventListener(callback: Function): number {\n        return this._loginCallbacks.push(callback);\n    }\n\n    /**\n     * Remove a callback from the LogIn event.\n     *\n     * @param id The id given when event listener was added.\n     *\n     * @returns true when remove successfully, false otherwise.\n     */\n    public removeLogInEventListener(id: number): boolean {\n        return delete this._loginCallbacks[id - 1];\n    }\n\n    /**\n     * Add a callback to the LogOut event.\n     *\n     * @param callback The Function called when the logout event is triggered and the\n     *    JWT token is received and accepted.\n     *\n     * @returns The registration id (necessary to unregister the event).\n     */\n    public addLogOutEventListener(callback: Function): number {\n        return this._logoutCallbacks.push(callback);\n    }\n\n    /**\n     * Remove a callback from the LogOut event.\n     *\n     * @param id The id given when event listener was added.\n     *\n     * @returns true when remove successfully, false otherwise.\n     */\n    public removeLogOutEventListener(id: number): boolean {\n        return delete this._logoutCallbacks[id - 1];\n    }\n\n    /**\n     * Listen for login messages from other windows.\n     * These messages contain the tokens from the AAP.\n     * If a token is received then the callbacks are triggered.\n     */\n    private _listenLoginMessage(renderer: Renderer2) {\n        renderer.listen('window', 'message', (event: MessageEvent) => {\n            if (!this.messageIsAcceptable(event)) {\n                return;\n            }\n            this._storageUpdater(event.data);\n            event.source.close();\n            this._updateCredentials();\n\n            // Triggers updating other windows\n            this._commKeyUpdater();\n        });\n    }\n\n    /** Listen to changes in the token from *other* windows.\n     *\n     * For inter-window communication messages are transmitted trough changes\n     * on a dummy storage key property: '_commKeyName'.\n     *\n     * Notice that changes in the '_commKeyName' produced by this class doesn't\n     * trigger this event.\n     */\n    private _listenChangesFromOtherWindows(renderer: Renderer2) {\n        renderer.listen('window', 'storage', (event: StorageEvent) => {\n            if (event.key === this._commKeyName) {\n                this._updateCredentials();\n            }\n        });\n    }\n\n    /**\n     * Check if the message is coming from the same domain we use to generate\n     * the SSO URL, otherwise it's iffy and shouldn't trust it.\n     */\n    private messageIsAcceptable(event: MessageEvent): boolean {\n        return event.origin === this._appURL;\n    }\n\n    private _updateCredentials() {\n        const isAuthenticated = this._loggedIn();\n\n        if (this._timeoutID) {\n            window.clearTimeout(this._timeoutID);\n        }\n\n        if (isAuthenticated) {\n            this._credentials.next({\n                realname: < string > this._getRealName(),\n                username: < string > this._getUserName(),\n                token: < string > this._getToken()\n            });\n\n            this._loginCallbacks.map(callback => callback && callback());\n\n            // Schedule future logout event base on token expiration\n            const expireDate = < Date > this._tokenService.getTokenExpirationDate();\n            // Coercing dates to numbers with the unary operator '+'\n            const delay = +expireDate - +new Date();\n            this._timeoutID = window.setTimeout(() => this.logOut(), delay);\n        } else {\n            this._storageRemover(); 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