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(ns postmark.core
(:require [clj-http.client :as client])
(:use [clojure.string :only (join)])
(:use [cheshire.core :only (generate-string parse-string)]))
(defn- mail-to-json
"Return the JSON for the given mail map.
Falsey values will be removed from the map before serializing."
(generate-string (into {} (filter second mail))))
(defn- send-to-postmark [api-key mail]
(let [resp (client/post ""
{:body (mail-to-json mail)
:headers {"X-Postmark-Server-Token" api-key}
:content-type :json
:accept :json})
body (parse-string (:body resp))]
(assoc resp :body body)))
(defn- get-to-string
"Create a string appropriate for the to/cc/bcc fields in a Postmark call.
Can be passed a email address as a string like '' or
'Foo Bar <>', or a seq of such strings."
(when to
(if (= java.lang.String (class to))
(join "," to))))
(defn- no-more-than-20-recipients [to]
(or (= java.lang.String (class to))
(<= (count to) 20)))
(defn- mail
"Send an email with the Postmark API.
Remember: Postmark only lets you send to at most twenty addresses at once."
[api-key from {:keys [to subject cc bcc tag text html reply-to]}]
{:pre [(no-more-than-20-recipients to)]}
(send-to-postmark api-key {"From" from
"To" (get-to-string to)
"Subject" subject
"Cc" (get-to-string cc)
"Bcc" (get-to-string bcc)
"Tag" tag
"TextBody" text
"HtmlBody" html
"ReplyTo" reply-to}))
(defn postmark [api-key from]
(partial mail api-key from))
(defn postmark-test [from]
(postmark "POSTMARK_API_TEST" from))
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