Added docs to multipart stores, made byte-array-store return a function

@@ -2,7 +2,13 @@
   (:import org.apache.commons.io.IOUtils))
 
 (defn byte-array-store
-  "Stores multipart file parameters as an array of bytes."
-  [item]
-  (-> (select-keys item [:filename :content-type])
-      (assoc :bytes (IOUtils/toByteArray (:stream item)))))
+  "Returns a function that stores multipart file parameters as an array of
+  bytes. The multipart parameters will be stored as maps with the following
+  keys:
+    :filename     - the name of the uploaded file
+    :content-type - the content type of the uploaded file
+    :bytes        - an array of bytes containing the uploaded content"
+  []
+  (fn [item]
+    (-> (select-keys item [:filename :content-type])
+        (assoc :bytes (IOUtils/toByteArray (:stream item))))))

@@ -27,7 +27,16 @@
     temp-file))
 
 (defn temp-file-store
-  "Stores multipart file parameters as a temporary file."
+  "Returns a function that stores multipart file parameters as temporary files.
+  Accepts the following options:
+    :expires-in - delete temporary files older than this many seconds
+                  (defaults to 3600 - 1 hour)
+  The multipart parameters will be stored as maps with the following keys:
+    :filename     - the name of the uploaded file
+    :content-type - the content type of the upload file
+    :tempfile     - a File object that points to the temporary file containing
+                    the uploaded data.
+    :size         - the size in bytes of the uploaded data"
   ([] (temp-file-store {:expires-in 3600}))
   ([{:keys [expires-in]}]
      (fn [item]

@@ -4,7 +4,8 @@
         ring.middleware.multipart-params.byte-array))
 
 (deftest test-byte-array-store
-  (let [result (byte-array-store
+  (let [store  (byte-array-store)
+        result (store
                 {:filename "foo.txt"
                  :content-type "text/plain"
                  :stream (string-input-stream "foo")})]