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middleware.clj
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middleware.clj
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(ns andrewslai.clj.http-api.middleware
(:require [andrewslai.clj.http-api.cache-control :as cc]
[buddy.auth.accessrules :as ar]
[buddy.auth.middleware :as ba]
[ring.middleware.content-type :refer [wrap-content-type]]
[ring.middleware.file :refer [wrap-file]]
[ring.middleware.json :as json-mw :refer [wrap-json-response]]
[ring.middleware.multipart-params :as mp :refer [wrap-multipart-params]]
[ring.middleware.params :as params :refer [wrap-params]]
[ring.middleware.resource :refer [wrap-resource]]
[ring.util.response :as resp]
[ring.util.http-response :refer [unauthorized]]
[taoensso.timbre :as log]
[lambdaisland.deep-diff2 :as ddiff])
(:import [lambdaisland.deep_diff2.diff_impl Mismatch Deletion Insertion]))
;; https://gist.github.com/hsartoris-bard/856d79d3a13f6cafaaa6e5079c76cd97
(def mismatch? (partial instance? Mismatch))
(def deletion? (partial instance? Deletion))
(def insertion? (partial instance? Insertion))
(def diff? (some-fn mismatch? deletion? insertion?))
(def non-empty-collection? (every-pred coll? not-empty))
(defn remove-unchanged
[x]
(cond
(diff? x) x
(map-entry? x) (let [[k v] x]
(cond
(diff? k) x
(diff? v) x
(non-empty-collection? v) (when-let [result (remove-unchanged v)]
[k result])
))
(coll? x) (when-let [result (->> x
(map remove-unchanged)
(filter not-empty)
(seq))]
(into (empty x) result))))
(defn print-diff
[x y]
(ddiff/pretty-print (remove-unchanged (ddiff/diff x y))))
(defn string-diff
[x y]
(with-out-str (ddiff/pretty-print (remove-unchanged (ddiff/diff x y))
(ddiff/printer {:print-color false}))))
(comment
(string-diff {:a :b}
{:c :d}))
(def ^:dynamic *request-id*
"Unbound")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Custom middlewares
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defn log-request! [handler]
(fn [request]
(handler (do (log/infof "Request received\n %s"
(-> request
(select-keys [:request-method
:uri
:body
:params
:multipart-params
:request-id])
clojure.pprint/pprint
with-out-str))
request))))
(defn debug-log-request!
"A logging tool that is useful for debugging"
[msg handler]
(fn [request]
(handler (do (log/debugf "Debug log: %s" msg)
(log/debugf "Ring Request: %s" (dissoc request
:compojure.api.request/swagger
:compojure.api.request/muuntaja
:compojure.api.request/lookup
:compojure.api.request/coercion
:compojure.api.request/paths
:compojure.api.middleware/components
:muuntaja/request
:protocol
:remote-addr))
request))))
(defn log-transformation-diffs
[{:keys [name handler]}]
(fn [x]
(let [modified-x (handler x)]
(log/debugf "Difference introduced by %s: %s"
name
(string-diff x modified-x))
modified-x)))
(comment
(require '[ring.mock.request :as mock])
((log-transformation-diffs {:name :Hello
:handler add-request-identifier})
(mock/request :get "/endpoint")))
(defn add-request-identifier
[request]
(let [request-id (str (java.util.UUID/randomUUID))
modified-request (assoc request :request-id request-id)]
modified-request))
(defn wrap-request-identifier
[handler]
(fn [request]
(let [request-id (str (java.util.UUID/randomUUID))]
(binding [*request-id* request-id]
(handler (let [modified-request (assoc request :request-id request-id)]
(ddiff/pretty-print (remove-unchanged (ddiff/diff request modified-request)))
(log/debugf "Adding request-id %s to ring request" request-id)
modified-request))))))
(defn- cache-control-log!
[response]
(log/infof "Generating Cache control headers")
response)
(defn wrap-cache-control
"Wraps responses with a cache-control header"
[handler]
(fn [{:keys [request-id uri] :as request}]
(->> (handler request)
(cache-control-log!)
(cc/cache-control uri))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Configured middleware stacks
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(def standard-stack
"Stack is applied from top down"
(apply comp [wrap-request-identifier
wrap-content-type
wrap-json-response
wrap-multipart-params
wrap-params
log-request!]))
(defn auth-stack
"Stack is applied from top down"
[authentication-backend access-rules]
(apply comp [#(ba/wrap-authentication % authentication-backend)
#(ar/wrap-access-rules % {:rules access-rules
:reject-handler (fn [& args]
(-> "Not authorized"
(unauthorized)
(resp/content-type "application/text")))})]))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; NEW -- Trying to convert middleware to processing chains
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defn compose-xforms
[xforms]
(reduce (fn [fs {:keys [name log-diffs? handler] :as xform}]
(let [f (if log-diffs?
(log-transformation-diffs xform))]
(comp f fs)))
identity
xforms))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Transform the incoming Ring request
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(def ring-request-pipeline-config
[{:name :add-request-identifier
:handler add-request-identifier
:log-diffs? true}
{:name :add-params-to-request
:handler params/params-request
:log-diffs? true}
{:name :add-multipart-params-to-request
:handler mp/multipart-params-request
:log-diffs? true}])
(defn ring-auth-pipeline-config
[authentication-backend access-rules]
[{:name :authenticate-user
:handler (fn [request]
(apply ba/authentication-request request authentication-backend))
:log-diffs? true}])
(def ring-request-pipeline
(compose-xforms ring-request-pipeline-config))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Transform the outgoing Ring response
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(def ring-response-pipeline-config
[{:name :convert-response-to-json
:handler (fn [response]
(json-mw/json-response response {}))
:log-diffs? true}
{:name :add-content-type-headers
:handler identity
:log-diffs? true}
{:name :add-cache-control-headers
:handler identity
:log-diffs? true}])
(def ring-response-pipeline
(compose-xforms ring-response-pipeline-config))
(comment
{:name :enforce-access-rules
:handler (fn [request]
(ar/wrap-access-rules
request
{:rules access-rules
:reject-handler (fn [& args]
(-> "Not authorized"
(unauthorized)
(resp/content-type "application/text")))}))}
(ring-request-pipeline (mock/request :get "/endpoint")))