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decision: docs on how to implement one #322

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16 changes: 16 additions & 0 deletions doc/decisions.md
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Expand Up @@ -8,6 +8,22 @@ Liberator supports a whole lot of decisions points. Some of them are
needed for next to every resource definition. Others are seldom used
or there is no other sensible implementation.

## Implementing a decision

A decision is a `(fn [{:keys [request resource] :as context}] ...)` that is expected to return a truthy value. In addition, it can also update the context - if the returned value is a map then it is merged into the context, if it is a function than the context is passed through it, if it is a vector then its second element is checked for being a map/function. Example:

```clojure
(defresource foo
:allowed-methods [:get]
:allowed? (fn [{:keys [request resource]}]
(let [user (my/fetch-user! request)]
(when (my/authorized? user resource)
{::user user})))
:handle-ok (fn [ctx]
(log/info "user" (-> ctx ::user :name) "accessed foo")
(foo/get (:request ctx))))
```

## Typical decision points for resource implementors

The following decisions points will be typically specified depending
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