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import Cookies, { CookieAttributes } from 'js-cookie';
import { FetchConnector } from './connectors/utils';
const AT_COOKIE = 'a_t';
export type CookieOptions =
| CookieAttributes
| ((accessToken?: string) => CookieAttributes);
export type GetTokens = (
req: IncomingMessage
) => { refreshToken?: string; accessToken?: string } | void;
export type Decode = (accessToken: string) => object | null | void;
export interface AuthClientOptions {
cookie?: string;
cookieOptions?: CookieOptions;
decode: Decode;
fetchConnector?: FetchConnector;
refreshTokenCookie?: string;
getTokens?: GetTokens;
}
export class AuthClient {
public cookie: string;
public cookieOptions?: CookieOptions;
public decode: Decode;
public fetch?: FetchConnector;
private refreshTokenCookie?: string;
private getTokens: GetTokens;
private clientATFetch?: Promise<string>;
constructor(options: AuthClientOptions) {
// Public
this.cookie = options.cookie || AT_COOKIE;
this.cookieOptions = options.cookieOptions;
this.decode = options.decode;
this.fetch = options.fetchConnector;
// Private
this.refreshTokenCookie = options.refreshTokenCookie;
this.getTokens = options.getTokens || this._getTokens;
}
/**
* Returns the accessToken from cookies
*/
public getAccessToken() {
return Cookies.get(this.cookie);
}
/**
* Decodes an accessToken and returns his payload or null
*/
public decodeAccessToken(accessToken: string) {
return (accessToken && this.decode(accessToken)) || null;
}
/**
* Sets an accessToken as a cookie and returns the accessToken
*/
public setAccessToken(accessToken: string) {
if (!accessToken) return;
Cookies.set(this.cookie, accessToken, {
expires: 365,
secure: location.protocol === 'https:',
...this.getCookieOptions(accessToken)
});
return accessToken;
}
/**
* Removes the accessToken from cookies
*/
public removeAccessToken() {
Cookies.remove(this.cookie, this.getCookieOptions());
}
/**
* Logouts the user, this means remove both accessToken and refreshToken from
* cookies
*/
public async logout() {
if (typeof window === 'undefined') return;
if (!this.fetch) {
this.removeAccessToken();
return { done: true };
}
return this.fetch.logout({ credentials: 'same-origin' }).then(json => {
this.removeAccessToken();
return json;
});
}
/**
* Returns a new accessToken
* @param req Sending a Request means the token will be created during SSR
*/
public async fetchAccessToken(req?: IncomingMessage) {
try {
return await (req ? this.fetchServerToken(req) : this.fetchClientToken());
} catch (err) {
const isFetchError = err.name === 'FetchError';
const isNetworkError = err.name === 'NetworkError';
// Don't ignore unknown errors
if (!isFetchError && !isNetworkError) throw err;
// Ignore errors in the server
if (req) return;
if (!isFetchError) throw err;
// Remove the accessToken that caused a FetchError
this.removeAccessToken();
}
}
/**
* Returns true if a refreshToken cookie is defined
*/
public withRefreshToken() {
return !!this.refreshTokenCookie;
}
/**
* Returns the accessToken on SSR from cookies, if no token exists or its
* invalid then it will fetch a new accessToken
*/
private async fetchServerToken(req: IncomingMessage) {
if (!this.fetch) return;
if (!this.withRefreshToken()) return;
const tokens = this.getTokens(req);
if (!tokens || !tokens.refreshToken) return;
const accessToken = this.verifyAccessToken(tokens.accessToken || '');
if (accessToken) return accessToken;
const data = await this.fetch.createAccessToken({
// This may have side effects
headers: req.headers as { [key: string]: string }
});
return data.accessToken;
}
/**
* Returns the accessToken from cookies, if no token exists or its
* invalid then it will fetch a new accessToken
*/
private async fetchClientToken() {
if (!this.fetch) return;
if (!this.withRefreshToken()) return;
const _accessToken = this.getAccessToken();
// If the browser doesn't have an accessToken in cookies then don't try to
// create a new one
if (!_accessToken) return;
const accessToken = this.verifyAccessToken(_accessToken);
if (accessToken) return accessToken;
// In this case the accessToken in cookies is invalid and we should create
// a new one, the promise is reused for the case of when the method is
// called multiple times
if (this.clientATFetch) return this.clientATFetch;
this.clientATFetch = this.fetch
.createAccessToken({
credentials: 'same-origin'
})
.then(data => {
this.clientATFetch = undefined;
this.setAccessToken(data.accessToken);
return data.accessToken;
});
return this.clientATFetch;
}
/**
* Verifies and returns an accessToken if it's still valid
*/
private verifyAccessToken(accessToken: string) {
if (accessToken && this.decodeAccessToken(accessToken)) {
return accessToken;
}
}
/**
* Returns the cookie options that will be used to set an accessToken,
* accessToken will be undefined when removing a cookie
*/
private getCookieOptions(accessToken?: string) {
const { cookieOptions } = this;
return cookieOptions && typeof cookieOptions === 'function'
? cookieOptions(accessToken)
: cookieOptions;
}
/**
* Gets the tokens from a Request
*/
private _getTokens(req: IncomingMessage) {
const parseCookie = require('cookie').parse;
const { cookie } = req.headers;
const cookies = cookie && parseCookie(cookie);
if (!cookies) return;
return {
refreshToken: this.refreshTokenCookie && cookies[this.refreshTokenCookie],
accessToken: cookies[this.cookie]
};
}
}
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