I had to do this again in another project so I tried Chas' suggestion. It
is much simpler than my earlier solution.
For anyone else doing this in the future, here's how you can write it:
(defn check-workflow-result
"check if the response contains and auth-map. If so, notify the event bus"
[request response]
(when (friend/auth? response)
(event-bus/fire :session-start
{:user-agent (get-in request [:headers "user-agent"])
:ip-address (:remote-addr request)
})))
(defn wrap [f]
(fn [request]
(let [response (f request)]
(check-workflow-result request response)
response)))
(def friend-interceptor
(friend-authenticate-interceptor
{:allow-anon? true
:unauthorized-handler (fn [request] (ring-resp/redirect "/thanks"))
:workflows [(wrap
(oauth2/workflow
{:credential-fn get-friend-creds
:login-uri "/login"
:client-config (authentication/get-oauth-config)
:uri-config authentication/uri-config-sfdc
}))]}))
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