This library provides utilities to interact with an OpenID identity provider (idp) via Clojure.

active-openid will try to discover Openid-endpoints at configured identity providers. Multiple identity providers can be configured.

Include the following in your project’s deps.edn file (or leiningen, boot, … Clojars):

{:deps {...
        de.active-group/active-openid {:git/tag "0.2.4" :git/sha "<sha256>"}
        ...}}

active-openid provides a configuration section for projects using active.clojure.config from =active-clojure=. Below is the configuration schema. An example configuration file can be found here.

Include the schema openid-schema via a section in your code like this

(ns your.ns
  (:require [active.clojure.config :as active-config]
            [active.clojure.openid.config :as openid-config]))

(def openid-section
  (config/section
    :openid
    openid-config/openid-schema))

Add active.clojure.openid/wrap-openid-authentication to your middleware stack. That guards your routes from unauthenticted users and offers authentication.

Use active.clojure.openid/user-info-from-request to obtain information about the logged-in user in your handlers from the current request. If the user is logged in, it returns an active.clojure.openid/UserInfo record with ID, display name, email, groups and additional information.

The data structure that represents a logged-in user also contains information on how to logout the user, i.e. the URI and parameters needed to submit to the logout endpoint. See active.clojure.openid/logout-link-hiccup and active.clojure.openid/logout-form-hiccup how to use and render it.

To support logout, wrap your logout handler with active.clojure.openid/wrap-openid-logout on the same route that wrap-openid-authentication uses as its logout-endpoint.

See ./example for details.

This library implements OpenID’s [Authorization Code Flow](https://tools.ietf.org/html/rfc6749#section-4.1). This works for regular web apps and server-side apps where the source code is not publicly exposed. The exchange must happen server-side because during this exchange the server must also pass along your application’s Client Secret, which must always be kept secure.

This also works for single-page applications when we guard the route that serves the application since the authentication then happens not in the application itself but beforehand on the server side. So we are fine.

When we serve a single-page application without such a guard, this library is not sufficient. Then we need to implement [Authorization Code Flow with Proof Key for Code Exchange (PKCE)](https://tools.ietf.org/html/rfc7636) in the client, so we need to implement it in ClojureScript. For that we should abstract a lot of the code in this library that takes care of building and parsing the various requests and replies into cljc namespaces that we can then use in both Clojure- and ClojureScript-specific implementations. Of course, doing the actual requests will differ. But this could probably also be abstracted with a monadic implementation with different monad runners.

Here are some useful links:

• https://auth0.com/docs/authenticate/login/oidc-conformant-authentication/oidc-adoption-access-tokens#custom-claims
• https://auth0.com/docs/get-started/authentication-and-authorization-flow/authorization-code-flow
• https://auth0.com/docs/get-started/authentication-and-authorization-flow/authorization-code-flow-with-proof-key-for-code-exchange-pkce

• If the IDP does not use wildcards in redirect uris, they should use the one that the application uses as its `:base-uri` in the configuration.

For your convenience, this project includes a minimal shell.nix file. Just run

nix-shell --pure

and you should be good to go.

active-openid provides a Makefile with a test target. To run the tests:

make test

active-openid provides a Makefile with a deploy target. To Release a new version to Clojars, the deploy target relies on two environment variables

• CLOJARS_USERNAME: Your clojars username.
• CLOJARS_PASSWORD: Your clojars cli token.

  To publish a new release, run:

  CLOJARS_USERNAME=<username> CLOJARS_PASSWORD=<cli-token> make deploy
      

Copyright © 2022-2023 Active Group GmbH

Distributed under the Eclipse Public License either version 2.0 or (at your option) any later version. (see LICENSE)

Some of the todos for this project.

• [ ] Frontchannel logout
• [ ] Backchannel logout
• [ ] check_session_iframe. Included in discovered endpoints and therefore usable. In the future, some direct support (maybe a reacl-c-item would be nice?). https://connect2id.com/products/server/docs/api/check-session https://github.com/embesozzi/oidc-check-session-iframe https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage https://atomizedobjects.com/blog/react/add-event-listener-react-hooks/