automatic refresh tokens

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 2.2.0
+
+- Allow refresh tokens to be sent on a separate cookie
+- Automatic token refresh if the access token is expired and the cookie header contains a valid refresh token
+
 ## 2.1.0
 
 - Allow access to Gateway functions like authenticate, get_cookie_auth, get_header_auth, redirect, deny

README.md

@@ -1,6 +1,6 @@
 # auth-server-helper
 
-version: 2.1.x
+version: 2.2.x
 
 customizable and simple authentication
 
@@ -23,7 +23,12 @@ const {create_gateway} = require('@sapphirecode/auth-server-helper');
 
 const gateway = create_gateway({
   redirect_url: '/auth', // if defined, unauthorized requests will be redirected
-  cookie_name: 'auth_cookie', // if defined, access tokens will be read from this cookie
+  cookie_name: 'auth_cookie', // if defined, access tokens will be read from this cookie,
+  refresh_cookie_name: 'refresh_cookie', // if defined, refresh tokens will be read and used to automatically refresh client tokens (requires the refresh_settings attribute)
+  refresh_settings: {
+    // same as settings for allow_access under section 2
+    // the options redirect_to and leave_open are not supported here
+  }
 });
 
 // express
@@ -98,7 +103,8 @@ const handler = create_auth_handler(
         // the same works in handlers after the gateway, information is always stored in request.connection.auth
       },
     },
-    cookie_name: 'auth_cookie', // if defined, access tokens will be stored in this cookie
+    cookie_name: 'auth_cookie', // if defined, access tokens will be stored in this cookie,
+    refresh_cookie_name: 'refresh_cookie' // if defined, refresh tokens will be stored in this cookie
   }
 );
 

lib/AuthHandler.ts

@@ -31,6 +31,9 @@ interface AccessResponse {
   refresh_expires_in?: number;
 }
 
+type AuthHandler =
+  (req: IncomingMessage, res: ServerResponse) => Promise<boolean>;
+
 class AuthRequest {
   public request: IncomingMessage;
   public response: ServerResponse;
@@ -47,6 +50,7 @@ class AuthRequest {
   public body: string;
 
   private _cookie_name?: string;
+  private _refresh_cookie_name?: string;
   private _is_successful: boolean;
 
   public get is_successful (): boolean {
@@ -57,7 +61,8 @@ class AuthRequest {
     req: IncomingMessage,
     res: ServerResponse,
     body: string,
-    cookie?: string
+    cookie?: string,
+    refresh_cookie?: string
   ) {
     this.request = req;
     this.response = res;
@@ -67,6 +72,7 @@ class AuthRequest {
     this.user = '';
     this.password = '';
     this._cookie_name = cookie;
+    this._refresh_cookie_name = refresh_cookie;
     this._is_successful = false;
   }
 
@@ -102,12 +108,10 @@ class AuthRequest {
       expires_in:   access_token_expires_in
     };
 
-    if (typeof this._cookie_name === 'string') {
-      this.response.setHeader (
-        'Set-Cookie',
-        `${this._cookie_name}=${at.signature}`
-      );
-    }
+    const cookies = [];
+
+    if (typeof this._cookie_name === 'string')
+      cookies.push (`${this._cookie_name}=${at.signature}`);
 
     if (include_refresh_token) {
       if (typeof refresh_token_expires_in !== 'number')
@@ -120,6 +124,16 @@ class AuthRequest {
       res.refresh_token = rt.signature;
       res.refresh_expires_in = refresh_token_expires_in;
       result.refresh_token_id = rt.id;
+
+      if (typeof this._refresh_cookie_name === 'string')
+        cookies.push (`${this._refresh_cookie_name}=${rt.signature}`);
+    }
+
+    if (cookies.length > 0) {
+      this.response.setHeader (
+        'Set-Cookie',
+        cookies
+      );
     }
 
     this._is_successful = true;
@@ -194,6 +208,7 @@ interface CreateHandlerOptions {
   refresh?: AccessSettings;
   modules?: Record<string, AuthRequestHandler>;
   cookie_name?: string;
+  refresh_cookie_name?: string;
 }
 
 // eslint-disable-next-line max-lines-per-function
@@ -261,7 +276,13 @@ function process_request (
 export default function create_auth_handler (
   default_handler: AuthRequestHandler,
   options?: CreateHandlerOptions
-) {
+): AuthHandler {
+  if (
+    typeof options?.cookie_name !== 'undefined'
+    && options.cookie_name === options.refresh_cookie_name
+  )
+    throw new Error ('access and refresh cookies cannot have the same name');
+
   return async (
     req: IncomingMessage,
     res: ServerResponse
@@ -276,7 +297,13 @@ export default function create_auth_handler (
       });
     });
 
-    const request = new AuthRequest (req, res, body, options?.cookie_name);
+    const request = new AuthRequest (
+      req,
+      res,
+      body,
+      options?.cookie_name,
+      options?.refresh_cookie_name
+    );
     const token = (/(?<type>\S+) (?<token>.+)/ui)
       .exec (req.headers.authorization as string);
 
@@ -292,5 +319,6 @@ export {
   AccessResponse,
   AuthRequest,
   AuthRequestHandler,
-  CreateHandlerOptions
+  CreateHandlerOptions,
+  AuthHandler
 };

lib/Gateway.ts

@@ -8,6 +8,7 @@
 import { IncomingMessage, ServerResponse } from 'http';
 import { run_regex } from '@sapphirecode/utilities';
 import authority from './Authority';
+import { AuthRequest, AccessSettings } from './AuthHandler';
 
 type AnyFunc = (...args: unknown[]) => unknown;
 type Gateway = (
@@ -15,15 +16,33 @@ type Gateway = (
   res: ServerResponse, next: AnyFunc
 ) => unknown;
 
+interface RefreshSettings extends AccessSettings {
+  leave_open?: never;
+  redirect_to?: never;
+}
+
 interface GatewayOptions {
   redirect_url?: string;
   cookie_name?: string;
+  refresh_cookie_name?: string;
+  refresh_settings?: RefreshSettings;
+}
+
+interface AuthCookies {
+  access_cookie: string | null;
+  refresh_cookie: string | null;
 }
 
 class GatewayClass {
   private _options: GatewayOptions;
 
   public constructor (options: GatewayOptions = {}) {
+    if (
+      typeof options.cookie_name === 'string'
+      && options.cookie_name === options.refresh_cookie_name
+    )
+      throw new Error ('access and refresh cookies cannot have the same name');
+
     this._options = options;
   }
 
@@ -52,25 +71,33 @@ class GatewayClass {
     return auth.groups?.data;
   }
 
-  public get_cookie_auth (req: IncomingMessage): string | null {
-    if (typeof this._options.cookie_name === 'undefined')
-      return null;
-    let auth = null;
+  public get_cookie_auth (req: IncomingMessage): AuthCookies {
+    const result: AuthCookies = {
+      access_cookie:  null,
+      refresh_cookie: null
+    };
+
+    const cookie_regex = /(?:^|;)\s*(?<name>[^;=]+)=(?<value>[^;]+)/gu;
+
     run_regex (
-      /(?:^|;)\s*(?<name>[^;=]+)=(?<value>[^;]+)/gu,
+      cookie_regex,
       req.headers.cookie,
       (res: RegExpMatchArray) => {
         if (res.groups?.name === this._options.cookie_name)
-          auth = res.groups?.value;
+          result.access_cookie = res.groups?.value as string;
+        else if (res.groups?.name === this._options.refresh_cookie_name)
+          result.refresh_cookie = res.groups?.value as string;
       }
     );
-    return auth;
+
+    return result;
   }
 
   public authenticate (req: IncomingMessage): boolean {
+    const cookies = this.get_cookie_auth (req);
     let auth = this.get_header_auth (req);
     if (auth === null)
-      auth = this.get_cookie_auth (req);
+      auth = cookies.access_cookie;
     if (auth === null)
       return false;
 
@@ -82,13 +109,55 @@ class GatewayClass {
     return ver.authorized;
   }
 
-  public process_request (
+  public async try_refresh (
+    req: IncomingMessage,
+    res: ServerResponse
+  ): Promise<boolean> {
+    if (
+      typeof this._options.refresh_cookie_name === 'undefined'
+      || typeof this._options.refresh_settings === 'undefined'
+    )
+      return false;
+
+    const refresh = this.get_cookie_auth (req).refresh_cookie;
+    if (refresh === null)
+      return false;
+
+    const ver = authority.verify (refresh);
+    if (ver.type === 'refresh_token' && ver.valid) {
+      const auth_request = new AuthRequest (
+        req,
+        res,
+        ''
+        , this._options.cookie_name,
+        this._options.refresh_cookie_name
+      );
+      const refresh_result = await auth_request.allow_access ({
+        ...this._options.refresh_settings,
+        leave_open: true
+      });
+
+      const con = req.connection as unknown as Record<string, unknown>;
+      con.auth = {
+        token_id:   refresh_result.access_token_id,
+        token_data: this._options.refresh_settings.data
+      };
+
+      return true;
+    }
+
+    return false;
+  }
+
+  public async process_request (
     req: IncomingMessage,
     res: ServerResponse,
     next: AnyFunc
-  ): unknown {
+  ): Promise<unknown> {
     if (this.authenticate (req))
       return next ();
+    if (await this.try_refresh (req, res))
+      return next ();
     return this.redirect (res);
   }
 }

lib/index.ts

@@ -12,7 +12,8 @@ import create_auth_handler, {
   AuthRequestHandler,
   AuthRequest,
   AccessSettings,
-  AccessResult
+  AccessResult,
+  AuthHandler
 } from './AuthHandler';
 import authority, {
   VerificationResult,
@@ -44,6 +45,7 @@ export {
   CreateHandlerOptions,
   AuthRequestHandler,
   AuthRequest,
+  AuthHandler,
   AccessSettings,
   AccessResult,
   VerificationResult,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@sapphirecode/auth-server-helper",
-  "version": "2.1.4",
+  "version": "2.2.0",
   "main": "dist/index.js",
   "author": {
     "name": "Timo Hocker",

test/spec/AuthHandler.ts

@@ -111,6 +111,7 @@ describe ('auth handler', () => {
       }
     }, {
       cookie_name:         'cookie_jar',
+      refresh_cookie_name: 'mint_cookies',
       refresh:             {
         access_token_expires_in:  expires_seconds,
         refresh_token_expires_in: refresh_expires_seconds,
@@ -158,6 +159,8 @@ describe ('auth handler', () => {
       .toEqual ('bearer');
     expect (resp1.headers['set-cookie'])
       .toContain (`cookie_jar=${res1.at}`);
+    expect (resp1.headers['set-cookie'])
+      .toContain (`mint_cookies=${res1.rt}`);
 
     check_token (res1.at as string, 'access_token');
     expect (res1.data.expires_in)
@@ -177,6 +180,8 @@ describe ('auth handler', () => {
       .toEqual ('bearer');
     expect (resp2.headers['set-cookie'])
       .toContain (`cookie_jar=${res2.at}`);
+    expect (resp2.headers['set-cookie'])
+      .toContain (`mint_cookies=${res2.rt}`);
 
     check_token (res2.at as string, 'access_token');
     expect (res2.data.expires_in)
@@ -207,6 +212,8 @@ describe ('auth handler', () => {
       .toEqual ('bearer');
     expect (resp1.headers['set-cookie'])
       .toContain (`cookie_jar=${res1.at}`);
+    expect (resp1.headers['set-cookie'])
+      .toContain (`mint_cookies=${res1.rt}`);
 
     check_token (res1.at as string, 'access_token');
     expect (res1.data.expires_in)
@@ -230,6 +237,8 @@ describe ('auth handler', () => {
       .toEqual ('bearer');
     expect (resp1.headers['set-cookie'])
       .toContain (`cookie_jar=${res1.at}`);
+    expect (resp1.headers['set-cookie'])
+      .toContain (`mint_cookies=${res1.rt}`);
 
     check_token (res1.at as string, 'access_token');
     expect (res1.data.expires_in)
@@ -301,6 +310,8 @@ describe ('auth handler', () => {
       .toEqual ('bearer');
     expect (resp2.headers['set-cookie'])
       .toContain (`cookie_jar=${res2.at}`);
+    expect (resp2.headers['set-cookie'])
+      .toContain (`mint_cookies=${res2.rt}`);
 
     check_token (res2.at as string, 'access_token');
     expect (res2.data.expires_in)
@@ -354,4 +365,14 @@ describe ('auth handler', () => {
     expect (signature).not.toEqual ('');
     check_token (signature, 'access_token');
   });
+
+  it ('should disallow access and refresh cookies with the same name', () => {
+    expect (() => {
+      create_auth_handler (() => Promise.resolve (), {
+        cookie_name:         'foo',
+        refresh_cookie_name: 'foo'
+      });
+    })
+      .toThrowError ('access and refresh cookies cannot have the same name');
+  });
 });

test/spec/Gateway.ts

@@ -20,7 +20,13 @@ describe ('gateway', () => {
 
     const g = create_gateway ({
       redirect_url:        'http://localhost/auth',
-      cookie_name:  'cookie_jar'
+      cookie_name:         'cookie_jar',
+      refresh_cookie_name: 'mint_cookies',
+      refresh_settings:    {
+        access_token_expires_in:  600,
+        include_refresh_token:    true,
+        refresh_token_expires_in: 3600
+      }
     });
 
     server = http.createServer ((req, res) => {
@@ -70,6 +76,22 @@ describe ('gateway', () => {
       .toEqual (token.id);
   });
 
+  it ('should automatically return new tokens', async () => {
+    const token = await authority.sign ('access_token', 60);
+    const refresh = await authority.sign ('refresh_token', 3600);
+    jasmine.clock ()
+      .tick (70000);
+    const resp = await get (
+      // eslint-disable-next-line max-len
+      { cookie: `foo=bar;cookie_jar=${token.signature};asd=efg;mint_cookies=${refresh.signature}` }
+    );
+    expect (resp.statusCode)
+      .toEqual (200);
+    expect (JSON.parse (resp.body as string).token_id)
+      .not
+      .toEqual (token.id);
+  });
+
   it ('should correctly deliver token data', async () => {
     const token = await authority.sign ('access_token', 60, { data: 'foobar' });
     const resp = await get ({ authorization: `Bearer ${token.signature}` });
@@ -137,4 +159,11 @@ describe ('gateway', () => {
     expect (resp.headers.location)
       .toEqual ('http://localhost/auth');
   });
+
+  it ('should disallow access and refresh cookies with the same name', () => {
+    expect (() => {
+      create_gateway ({ cookie_name: 'foo', refresh_cookie_name: 'foo' });
+    })
+      .toThrowError ('access and refresh cookies cannot have the same name');
+  });
 });