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headers.clj
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headers.clj
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;;; Lazy headers.
;;; Copyright 2010 Hubert Iwaniuk
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;; http://www.apache.org/licenses/LICENSE-2.0
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
(ns http.async.client.headers "Asynchrounous HTTP Client - Clojure - Lazy headers"
{:author "Hubert Iwaniuk"}
(:import (io.netty.handler.codec.http HttpHeaders)
(clojure.lang MapEntry APersistentMap)))
(defn- ^String kn [k]
(if (keyword? k) (name k) k))
;; Convertion of AHC Headers to lazy map.
(defn convert-headers-to-map
"Converts Http Response Headers to lazy map."
[#^HttpHeaders hds]
(let [names (.names hds)]
(proxy [APersistentMap]
[]
(containsKey [k] (.contains hds (kn k)))
(entryAt [k] (when (.contains hds (kn k))
(proxy [MapEntry]
[k nil]
(val [] (.get hds (kn k))))))
(valAt
([k] (.get hds (kn k)))
([k default] (if (.contains hds (kn k))
(.get hds (kn k))
default)))
(cons [m] (throw (UnsupportedOperationException. "Form 'cons' not supported: headers are read only.")))
(count [] (.size names))
(assoc [k v] (throw (UnsupportedOperationException. "Form 'assoc' not supported: headers are read only.")))
(without [k] (throw (UnsupportedOperationException. "Form 'without' not supported: headers are read only")))
(seq [] ((fn thisfn [plseq]
(lazy-seq
(when-let [pseq (seq plseq)]
(let [k (keyword (.toLowerCase (first pseq)))]
(cons (proxy [MapEntry]
[k nil]
(val [] (.get hds (kn k))))
(thisfn (rest pseq)))))))
names)))))
;; Creates cookies from headers.
(defn create-cookies
"Creates cookies from headers."
[headers]
(if (contains? headers :set-cookie)
(for [cookie-string (let [set-cookie (:set-cookie headers)]
(if (string? set-cookie) (vector set-cookie) set-cookie))]
(let [name-token (atom true)]
(into {}
(for [#^String cookie (.split cookie-string ";")]
(let [keyval (map (fn [#^String x] (.trim x)) (.split cookie "=" 2))]
(if @name-token
(do
(compare-and-set! name-token true false)
{:name (first keyval) :value (second keyval)})
[(keyword (first keyval)) (second keyval)]))))))
(println "No Set-Cookie header.")))