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middleware.clj
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middleware.clj
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(ns com.timezynk.domain.middleware
(:require
[clojure.core.reducers :as r]
[cheshire.core :refer [parse-string]]
clojure.string))
(defn- v-vector [v]
(clojure.string/split v #"\;"))
(defn- set-value [v]
(when-not (or (= "null" v)
(= "nil" v))
v))
(defn- collect-param-value [v]
{:fields (if (= "true" v)
:all
(some->> v v-vector (map keyword) (into [])))})
(defn- parse-query-param [[k v]]
(let [[_ n op] (or (re-find #"^([a-z-_A-Z]+)\[([a-z]+)\]" k)
(re-find #"^([a-zA-Z0-9\-_.]+)" k))
prop-name (keyword n)
op (when-not (nil? op)
(keyword (str "_" op "_")))
v (set-value v)]
(cond
(= :_collect_ op) [:_collect_ {prop-name (collect-param-value v)}]
(= :_in_ op) [prop-name, {op (when-not (nil? v) (v-vector v))}]
op [prop-name, {op v}]
:else [prop-name, v])))
(defn- q-param [q]
(try
(->> (parse-string q true)
(into []))
(catch Exception _e
[])))
(defn- split-params [query]
[(dissoc query :_collect_)
(get query :_collect_)])
(defn- into-map-merge [v]
(r/reduce (fn [acc [k v]]
(update-in acc
[k]
#(if (map? v)
(merge % v)
v)))
{}
v))
(defn parse-params [request]
(let [{:keys [query-params]} request]
(->> (dissoc query-params "q")
(map parse-query-param)
(concat (q-param (get query-params "q" "")))
into-map-merge
split-params)))
(defn wrap-domain-query-and-collect-params [handler]
(fn [request]
(let [[query-params, collect-params] (parse-params request)]
(handler (assoc request
:domain-query-params query-params
:domain-collect-params collect-params)))))