From fa44d7a92c1753ddddf51e29525e12ca6d057155 Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Sun, 27 Dec 2020 15:47:38 +0100
Subject: Add the dkim out proxy service

This service signs all inbound emails and relays them without question.
---
 .guix-channel                           |  6 ++++
 guix/vkraus/services/dkim-out-proxy.scm | 57 +++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 .guix-channel
 create mode 100644 guix/vkraus/services/dkim-out-proxy.scm

diff --git a/.guix-channel b/.guix-channel
new file mode 100644
index 0000000..8e7197b
--- /dev/null
+++ b/.guix-channel
@@ -0,0 +1,6 @@
+(channel
+ (version 0)
+ (directory "guix"))
+;; Local Variables:
+;; mode: scheme
+;; End:
diff --git a/guix/vkraus/services/dkim-out-proxy.scm b/guix/vkraus/services/dkim-out-proxy.scm
new file mode 100644
index 0000000..999d65d
--- /dev/null
+++ b/guix/vkraus/services/dkim-out-proxy.scm
@@ -0,0 +1,57 @@
+(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)
+  (output-port dkim-out-proxy-configuration-output-port)
+  (domain dkim-out-proxy-configuration-domain)
+  (keyfile dkim-out-proxy-configuration-keyfile))
+
+(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 #$dkimproxy "/bin/dkimproxy.out")
+	    (string-append "--listen=localhost:" #$input-port)
+	    (string-append "--relay=localhost:" #$output-port)
+	    (string-append "--domain=" #$domain)
+	    (string-append "--keyfile=" #$keyfile)
+	    "--selector=*")))
+       (stop #~(make-kill-destructor)))))))
+
+(define-public dkim-out-proxy-service-type
+  (service-type (name 'dkim-out-proxy)
+		(extensions
+		 (list
+		  (service-extension
+		   shepherd-root-service-type
+		   dkim-out-proxy-shepherd-service)))))
-- 
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