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POUse Friend for authentication and authorisation in a single page Clojure web application
 

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  1. POUse Friend for authentication and authorisation in a single page Clojure web application
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    <p>I am trying to integrate Friend authentication and authorisation into a Clojure/Compojure single-page web application.</p> <p>I have a login form backed by an Angular controller, and this controller uses AJAX to authenticate username and password against the web application and obtain an authenticated user record. Because of this, I do not want the default behaviour provided by the Friend form-based login - I basically want to rely on HTTP status codes and I do <em>not</em> want any of the Friend page-redirects.</p> <p>For example, making an unauthenticated request should simply return a 401 status code, and should not redirect to "/login". I have this part working by specifying a custom ":unauthenticated-handler" when configuring Friend (code included below).</p> <p>On a successful login I simply want a 200 status code, and not a redirect to the originally requested page. This is what I can't get working.</p> <p>I wrote a custom Friend authentication workflow based on the various examples (my Clojure skills are beginner level right now):</p> <pre><code>(defn my-auth [&amp; {:keys [credential-fn]}] (routes (GET "/logout" req (friend/logout* {:status 200})) (POST "/login" {{:keys [username password]} :params} (if-let [user-record (-&gt; username credential-fn)] (if (and [user-record password] (creds/bcrypt-verify password (:password user-record))) (let [user-record (dissoc user-record :password)] (workflows/make-auth user-record {:cemerick.friend/workflow :my-auth :cemerick.friend/redirect-on-auth? true})) {:status 401}) {:status 401})))) </code></pre> <p>Here is my handler with middlewares declared:</p> <pre><code>(def app (-&gt; (handler/site (friend/authenticate app-routes {:credential-fn (partial creds/bcrypt-credential-fn my-credential-fn) :unauthenticated-handler unauthenticated :workflows [(my-auth :credential-fn my-credential-fn)]})) (session/wrap-session) (params/wrap-keyword-params) (json/wrap-json-body) (json/wrap-json-response {:pretty true}))) </code></pre> <p>And the additional handler function referenced by the above:</p> <pre><code>(defn unauthenticated [v] {:status 401 :body "Unauthenticated"}) </code></pre> <p>Finally an additional routes fragment to test the authentication:</p> <pre><code>(GET "/auth" req (friend/authenticated (str "You have successfully authenticated as " (friend/current-authentication)))) </code></pre> <p>This <em>mostly</em> works, and <em>almost</em> does everything I need.</p> <p>Because "redirect-on-auth?" is true in "make-auth", on a successful login a page-redirect is generated - I want to prevent that redirect so I set the value to false. However, this single change results in a 404 and a failed login.</p> <p>So as well as the Friend authentication map I need somehow to return a 200 status code here, and also I want to return the "user-record" in the response body so the client application can tailor the UI depending on the user roles (I already have JSON requests/responses wrapped and working).</p> <p>So I think I need the equivalent of this when I invoke the Friend "make-auth" function:</p> <pre><code>{:status 200 :body user-record} </code></pre> <p>However it seems like I can have either the authentication map, or the response - but not both together.</p> <p>Can this be achieved with Friend and if so how?</p>
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    1. COMaybe this is related: https://github.com/cemerick/friend/issues/83, implying that it's not currently possible and needs a fix to Friend.
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    2. COyes that seems to be the case.
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