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(define-module (vkraus services dkim-out-proxy)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (guix gexp)
  #:use-module (guix modules)
  #:use-module (guix records)
  #:use-module (gnu packages mail)
  #:use-module (ice-9 match)
  #:use-module (ice-9 optargs))

(define-record-type* <dkim-out-proxy-configuration>
  dkim-out-proxy-configuration
  make-dkim-out-proxy-configuration
  dkim-out-proxy-configuration?
  (dkimproxy dkim-out-proxy-configuration-dkimproxy (default dkimproxy))
  (input-port dkim-out-proxy-configuration-input-port (default 11333))
  (output-port dkim-out-proxy-configuration-output-port (default 10028))
  (domain dkim-out-proxy-configuration-domain)
  (keyfile dkim-out-proxy-configuration-keyfile (default "/etc/dkim/privkey.pem")))

(export <dkim-out-proxy-configuration>
	dkim-out-proxy-configuration
	make-dkim-out-proxy-configuration
	dkim-out-proxy-configuration?
	dkim-out-proxy-configuration-dkimproxy
	dkim-out-proxy-configuration-input-port
	dkim-out-proxy-configuration-output-port
	dkim-out-proxy-configuration-domain
	dkim-out-proxy-configuration-keyfile)

(define dkim-out-proxy-shepherd-service
  (match-lambda
    (($ <dkim-out-proxy-configuration>
	dkimproxy input-port output-port domain keyfile)
     (list
      (shepherd-service
       (provision '(dkim-out))
       (documentation "Run the dkim out proxy")
       (requirement '(user-processes loopback syslogd))
       (start
	#~(make-forkexec-constructor
	   (list
	    (string-append #$dkimproxy "/bin/dkimproxy.out")
	    (format #f "--listen=localhost:~a" #$input-port)
	    (format #f "--relay=localhost:~a" #$output-port)
	    (format #f  "--domain=~a" #$domain)
	    (format #f "--keyfile=~a" #$keyfile)
	    "--selector=dkim")))
       (stop #~(make-kill-destructor)))))))

(define-public dkim-out-proxy-service-type
  (service-type (name 'dkim-out-proxy)
                (description "Run a DKIM signing proxy.")
		(extensions
		 (list
		  (service-extension
		   shepherd-root-service-type
		   dkim-out-proxy-shepherd-service)))))