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+;; Copyright (c) James Reeves. All rights reserved.
+;; The use and distribution terms for this software are covered by the Eclipse
+;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) which
+;; can be found in the file epl-v10.html at the root of this distribution. By
+;; using this software in any fashion, you are agreeing to be bound by the
+;; terms of this license. You must not remove this notice, or any other, from
+;; this software.
+
+(ns compojure.http.request
+  "Functions for pulling useful data out of a HTTP request map."
+  (:use compojure.control
+        compojure.encodings
+        compojure.map-utils
+        compojure.str-utils
+        clojure.contrib.duck-streams
+        clojure.contrib.str-utils)
+  (:import java.net.URLDecoder
+           java.io.InputStreamReader))
+
+(defn- parse-params
+  "Parse parameters from a string into a map."
+  [param-string separator]
+  (reduce
+    (fn [param-map s]
+      (if-let [[_ key val] (re-matches #"([^=]+)=(.*)" s)]
+        (assoc-vec param-map
+          (keyword (urldecode key))
+          (urldecode (or val "")))
+        param-map))
+    {}
+    (remove blank?
+      (re-split separator param-string))))
+
+(defn parse-query-params
+  "Parse parameters from the query string."
+  [request]
+  (if-let [query (request :query-string)]
+    (parse-params query #"&")))
+
+(defn get-character-encoding
+  "Get the character encoding, or use the default from duck-streams."
+  [request]
+  (or (request :character-encoding) *default-encoding*))
+
+(defn- slurp-body
+  "Slurp the request body into a string."
+  [request]
+  (let [encoding (get-character-encoding request)]
+    (if-let [body (request :body)]
+      (slurp* (InputStreamReader. body encoding)))))
+
+(defn urlencoded-form?
+  "Does a request have a urlencoded form?"
+  [request]
+  (if-let [type (:content-type request)]
+    (.startsWith type "application/x-www-form-urlencoded")))
+
+(defn parse-form-params
+  "Parse urlencoded form parameters from the request body."
+  [request]
+  (if (urlencoded-form? request)
+    (if-let [body (slurp-body request)]
+      (parse-params body #"&"))))
+
+(defn- get-merged-params
+  "Get a map of all the parameters merged together."
+  [request]
+  (merge (:query-params request)
+         (:form-params request)
+         (:params request)))
+
+(defn- assoc-func
+  "Associate the result of a (func request) with a key on the request map."
+  [request key func]
+  (if (contains? request key)
+    request
+    (assoc request key (or (func request) {}))))
+
+(defn assoc-params
+  "Associate urlencoded parameters with a request. The following keys are added
+  to the request map: :query-params, :form-params and :params."
+  [request]
+  (-> request
+    (assoc-func :query-params parse-query-params)
+    (assoc-func :form-params  parse-form-params)
+    (assoc-func :params       get-merged-params)))
+
+(defn with-request-params
+  "Decorator that adds urlencoded parameters to the request map."
+  [handler]
+  (fn [request]
+    (handler (assoc-params request))))
+
+(defn parse-cookies
+  "Pull out a map of cookies from a request map."
+  [request]
+  (if-let [cookies (get-in request [:headers "cookie"])]
+    (parse-params cookies #";\s*")))
+
+(defn assoc-cookies
+  "Associate cookies with a request map."
+  [request]
+  (assoc-func request :cookies parse-cookies))
+
+(defn with-cookies
+  "Decorator that adds cookies to a request map."
+  [handler]
+  (fn [request]
+    (handler (assoc-cookies request))))