oidc-angular-wso2is

Example of an Angular single-page application demonstrating OAuth 2 / OpenID Connect (OIDC) authentication using WSO2 Identity Server.

📌 You may want to read the article Guidelines for OAuth 2.0 / OpenID Connect for more information and best practices on this topic.

The entire project relies on the angular-oauth2-oidc library and has been successfully tested with

WSO2 Identity Server 5.7.0 as key manager for WSO2 API Manager 2.6.0 (both with recent WUM update)
WSO2 Identity Server 5.8.0

The application is supposed to look somewhat like this (click the image to enlarge it):

Features

This project supports a reach set of features. Most interesting ones can be found in the core module.

Main features

Main features are strictly related to the authorization process, especially from a generic single-page application:

OAuth2 grants: Support for either code flow with PKCE (recommended) or implicit flow for authorization
OpenID discovery: This process determines the location of the OpenID Provider.
Silent refresh on startup: Trying silent refresh on app startup before potentially starting a login flow gives the Identity Server the opportunity to recognize the user (typically through a cookie), so avoiding an unnecessary login.
Token revocation on logout: When this feature is enabled (see Preparing sources) the access token and its refresh token (if present) are revoked when the user logs out.
Auto-login: When this feature is enabled (see Preparing sources) the user is automatically redirected to the login page on the STS server.
OpenID's external logout
Token Storage: Using localStorage for storing tokens

Additional features

The project supports a few additional features that can help you with authentication in your Angular apps:

API call interceptor: By intercepting calls to the API's the access token is silently attached to request headers. In fact, this feature is directly provided by the angular-oauth2-oidc library itself.
Route guards: Angular's route guards are interfaces which can tell the router whether or not it should allow navigation to a requested route:
- An auth guard that forces you to login when navigating to protected routes
- An auth guard that just prevents you from navigating to protected routes
- Asynchronous loading of login information (and thus async auth guards)
Angular modules: core, shared, and two feature modules

Getting started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Prerequisites

Installing

The project is a standard Angular CLI application. If you open a command prompt in that directory, you can run any ng command (e.g., ng test), or use npm to install extra packages into it.

1️⃣ Preparing WSO2 Identity Server

To make the OIDC discovery process work without having to use WSO2 IS administrator credentials from the single-page app you have to unsecure the dicovery endpoint:
- Open the file <IS_HOME>/repository/conf/identity/identity.xml
- Find this line
```
<Resource context="(.*)/.well-known(.*)" secured="true" http-method="all"/>
```
- Set secure attribute to false and save the file
- Restart the WSO2 Identity Server
Sign in to the WSO2 Identity Server Management Console.
On the Main tab, click Identity > Service Providers > Add. Enter the Service Provider Name and optionally provide a brief description. Click Register.
Expand the Inbound Authentication Configuration section and then expand OAuth/OpenID Connect Configuration. Click Configure.
- For authorization code grant only (recommended):
  - For the Allowed Grant Types enable Code. Notice that for security reasons, especially for your production environment, this should be the only allowed grant type apart from the optional Refresh Token grant type.
  - Flag the PKCE Mandatory checkbox in order to reject pure authorization code grant.
  - Flag the Allow authentication without the client secret checkbox since single-page applications cannot guarantee the confidentiality of the client secret.
- For implicit grant only (NOT recommended):
  - For the Allowed Grant Types enable Implicit.
- Set the Callback Url, which is the exact location in the service provider's application where an access token would be sent. Since our single-page application has 2 callback URLs you have to use a regex pattern like regexp=(http://localhost:4200/index.html|http://localhost:4200/silent-refresh.html). Notice that you must have the prefix regexp= before your regex pattern.
- Click Add. Note that client key and client secret get generated.
Expand the Claim Configuration section to specify information of the user that the application needs form the Identity Server where the service provider authenticates. Refer to Configuring Claims for a Service Provider.

2️⃣ Preparing sources

If you need to specify a context for your app just change the tag <base href="/"> of the file src/index.html with something like <base href="/my/context">.
In src/app/core/config.service.ts properly set the following properties:
- authUrl: the URL of your authorization server (WSO2 Identity Server in our case)
- apiUrl: the URL of your API server (WSO2 API Manager in our case)
- revokeTokenOnLogout: if true the access token and its refresh token (if present) are revoked when the user logs out.
- autoLogin: if true the user is automatically redirected to the login page on the STS server.
In src/app/core/auth.config.ts:
- Set property clientId to the value of the OAuth client key previously generated for the service provider in WSO2 IS.
- Set property responseType according to the authorization grant you have previously chosen for the service provider in WSO2 IS: 'code' for code flow and '' for implicit flow.
Run npm install to install dependencies.
Run ng serve to startup a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Troubleshooting

Here is a list of known symptoms and malfunctions with their respective solutions:

If you encounter a CORS issue apply solution #2 reported at https://docs.wso2.com/display/IS580/Invoking+an+Endpoint+from+a+Different+Domain
If you're dealing with different domains and you get 403 Forbidden on login or logout, it's likely due to a cross-site request forgery (CSRF) issue. In file <HOME_IS>/repository/conf/security/Owasp.CsrfGuard.Carbon.properties try disabling the csrfguard filter like that
```
org.owasp.csrfguard.Enabled = false
```

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

The Angular application uses the angular-oauth2-oidc library that is certified by OpenID Foundation.
The project is heavily inspired by the project sample-angular-oauth2-oidc-with-auth-guards.

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