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

Question

I am trying to integrate Friend authentication and authorisation into a Clojure/Compojure single-page web application.

I have a login form backed by an Angular controlle

Answer 1

You need to have :redirect-on-auth? as false and you need to wrap your response in a response map {:status 200 :body (workflows/make-auth...)}. Note that you probably need to serialize your body to a String or something else that can be handled.

Answer 2

I've built a working solution to your issue. The key is to make sure you return a status, body, and merge the the authentication credentials into response. So you want to return

{:status 200 :body {:message "Hello World"} 
 :session {:cemerick.friend/identity {...}} ...}

The problem with the solution above is that it merges the session results into the body, instead of into ring response itself. Gist

(defn- form-ajax-response 
  "Creates an Ajax Request.
   Authenticates User by merging authentication
   into response along with status and body allowing
   for ajax response."
  [status body resp auth content-type]
  (let [auth-resp (friend/merge-authentication (dissoc resp :body-params) auth)
        formatter (case content-type 
                    "application/edn" noir.response/edn
                    noir.response/json)]
    (merge auth-resp {:status status} (formatter {:body body}))))

(def not-nil? (complement nil?))

(defn form-or-ajax-login 
  "Friend Workflow for Handling forms or ajax requests posted to 
   '/login'.  When a form is posted, the request will initiate a redirect
   on login When the post is performed via ajax. A response will be sent
   with success and redirect information"
  [& {:keys [login-uri credential-fn login-failure-handler redirect-on-auth?] :as ajax-config
      :or {redirect-on-auth? true}}]
  (fn [{:keys [uri request-method content-type params] :as request}]
    (when (and (= :post request-method)
               (= uri (gets :login-uri ajax-config (::friend/auth-config request))))
      (let [creds {:username (:username params) 
                   :password (:password params)}
            {:keys [username password]} creds
            ajax? (not-nil? (ajax-request-type content-type))
            cred-fn (gets :credential-fn ajax-config (::friend/auth-config request))]
        (when-let [user-record (and username password (cred-fn creds))]
          (let [user-auth (workflow/make-auth user-record {::friend/workflow :form-or-ajax
                                                           ::friend/redirect-on-auth? false})]
            (case ajax?
              true (form-ajax-response 202 {:Tom "Peterman"} request user-auth content-type)
              user-auth)))))))