Rewrite __letsencrypt_cert type

This commit adds the following features:

 * Ability to expand existing certificate
 * Ability to manage object state
 * Ability to obtain test certificate
 * Ability to promote test certificate to production
 * Ability to specify custom certificate name
 * Ability to specify multiple domains per certificate
 * Ability to use Certbot in standalone mode
 * Messaging

This commit also introduces the following behavioral changes:

 * Attempt to install Certbot only when it is not installed
   already
 * Installation of the cron job has to be enabled using
   `--automatic-renewal` parameter

**Note:** Object ID is now treated as certificate name and new
required parameter `--domain` was added.

cdist/conf/type/__letsencrypt_cert/explorer/certbot-path

@@ -0,0 +1,3 @@
+#!/bin/sh -e
+
+command -v certbot 2>/dev/null || true

cdist/conf/type/__letsencrypt_cert/explorer/certificate-domains

@@ -0,0 +1,4 @@
+#!/bin/sh -e
+
+certbot certificates --cert-name "${__object_id:?}" | grep '    Domains: ' | \
+	cut -d ' ' -f 6- | tr ' ' '\n'

cdist/conf/type/__letsencrypt_cert/explorer/certificate-exists

@@ -0,0 +1,7 @@
+#!/bin/sh -e
+
+if certbot certificates | grep -q "  Certificate Name: ${__object_id:?}$"; then
+	echo yes
+else
+	echo no
+fi

cdist/conf/type/__letsencrypt_cert/explorer/certificate-is-test

@@ -0,0 +1,8 @@
+#!/bin/sh -e
+
+if certbot certificates --cert-name "${__object_id:?}" | \
+	grep -q 'INVALID: TEST_CERT'; then
+	echo yes
+else
+	echo no
+fi

cdist/conf/type/__letsencrypt_cert/explorer/exists

@@ -1,5 +0,0 @@
-domain=$__object_id
-
-if [ -f "/etc/letsencrypt/live/$domain/fullchain.pem" ]; then
-   echo yes
-fi

cdist/conf/type/__letsencrypt_cert/gencode-remote

@@ -1,18 +1,75 @@
-domain="$__object_id"
+#!/bin/sh -e
 
-exists=$(cat "$__object/explorer/exists")
-webroot="$(cat "$__object/parameter/webroot")"
-admin_email="$(cat "$__object/parameter/admin-email")"
+certificate_exists=$(cat "${__object:?}/explorer/certificate-exists")
+name="${__object_id:?}"
+state=$(cat "${__object}/parameter/state")
 
-if [ -n "$exists" ]; then
+case "${state}" in
+	absent)
+		if [ "${certificate_exists}" = "no" ]; then
 			exit 0
 		fi
 
-cat <<EOF
-if [ ! -d "$webroot" ]; then
-	mkdir -p "$webroot"
+		echo "certbot delete --cert-name '${name}' --quiet"
+
+		echo remove >> "${__messages_out:?}"
+	;;
+	present)
+		requested_domains="${__object}/parameter/domain"
+
+		staging=no
+		if [ -f "${__object}/parameter/staging" ]; then
+			staging=yes
 		fi
 
-certbot certonly -n --agree-tos --email '$admin_email' --quiet --webroot \
-	-w '$webroot' -d '$domain'
+		if [ "${certificate_exists}" = "yes" ]; then
+			existing_domains="${__object}/explorer/certificate-domains"
+			certificate_is_test=$(cat "${__object}/explorer/certificate-is-test")
+
+			sort -uo "${requested_domains}" "${requested_domains}"
+			sort -uo "${existing_domains}" "${existing_domains}"
+
+			if [ -z "$(comm -23 "${requested_domains}" "${existing_domains}")" ] && \
+				[ "${certificate_is_test}" = "${staging}" ]; then
+				exit 0
+			fi
+		fi
+
+		admin_email="$(cat "$__object/parameter/admin-email")"
+		webroot="$(cat "$__object/parameter/webroot")"
+
+		cat <<-EOF
+		certbot certonly \
+			--agree-tos \
+			--cert-name '${name}' \
+			--email '${admin_email}' \
+			--expand \
+			--non-interactive \
+			--quiet \
+			$(if [ "${staging}" = "yes" ]; then
+				echo "--staging"
+			elif [ "${certificate_is_test}" != "${staging}" ]; then
+				echo "--force-renewal"
+			fi) \
+			$(if [ -z "${webroot}" ]; then
+				echo "--standalone"
+			else
+				echo "--webroot --webroot-path '${webroot}'"
+			fi) \
+			$(while read -r domain; do
+				echo "--domain '${domain}' \\"
+			done < "${requested_domains}")
 		EOF
+
+		if [ "${certificate_exists}" = "no" ]; then
+			echo create >> "${__messages_out}"
+		else
+			echo change >> "${__messages_out}"
+		fi
+	;;
+	*)
+		echo "Unsupported state: ${state}" >&2
+
+		exit 1
+	;;
+esac

cdist/conf/type/__letsencrypt_cert/man.rst

@@ -3,54 +3,95 @@ cdist-type__letsencrypt_cert(7)
 
 NAME
 ----
-cdist-type__letsencrypt_cert - Get an SSL certificate from Let's Encrypt
 
+cdist-type__letsencrypt_cert - Get an SSL certificate from Let's Encrypt
 
 DESCRIPTION
 -----------
-Automatically obtain a Let's Encrypt SSL certificate. Uses certbot's webroot
-method. You must set up your web server to work with webroot.
 
+Automatically obtain a Let's Encrypt SSL certificate using Certbot.
 
 REQUIRED PARAMETERS
 -------------------
-webroot
-   The path to your webroot, as set up in your webserver config.
 
 admin-email
     Where to send Let's Encrypt emails like "certificate needs renewal".
 
+REQUIRED MULTIPLE PARAMETERS
+----------------------------
+
+domain
+    A domain to be included in the certificate.
 
 OPTIONAL PARAMETERS
 -------------------
-None.
 
+state
+    'present' or 'absent', defaults to 'present' where:
+
+    present
+        if the certificate does not exist, it will be obtained
+    absent
+        the certificate will be removed
+
+webroot
+    The path to your webroot, as set up in your webserver config. If this
+    parameter is not present, Certbot will be run in standalone mode.
 
 OPTIONAL MULTIPLE PARAMETERS
 ----------------------------
+
 renew-hook
-    Renew hook command directly passed to certbot in cron job.
+    Renew hook command directly passed to Certbot in cron job.
+
+BOOLEAN PARAMETERS
+------------------
+
+automatic-renewal
+    Install a cron job, which attempts to renew certificates daily.
+
+staging
+    Obtain a test certificate from a staging server.
+
+MESSAGES
+--------
+
+change
+    Certificte was changed.
+
+create
+    Certificte was created.
+
+remove
+    Certificte was removed.
 
 EXAMPLES
 --------
 
 .. code-block:: sh
 
-    __letsencrypt_cert example.com --admin-email root@example.com --webroot /data/letsencrypt/root
-
-    __letsencrypt_cert example.com --admin-email root@example.com --webroot /data/letsencrypt/root --renew-hook "service nginx reload"
+    __letsencrypt_cert example.com \
+        --admin-email root@example.com \
+        --automatic-renewal \
+        --domain example.com \
+        --domain foo.example.com \
+        --domain bar.example.com \
+        --renew-hook "service nginx reload" \
+        --webroot /data/letsencrypt/root
 
 
 AUTHORS
 -------
+
 | Nico Schottelius <nico-cdist--@--schottelius.org>
 | Kamila Součková <kamila--@--ksp.sk>
 | Darko Poljak <darko.poljak--@--gmail.com>
-
+| Ľubomír Kučera <lubomir.kucera.jr at gmail.com>
 
 COPYING
 -------
-Copyright \(C) 2017 Nico Schottelius, Kamila Součková, Darko Poljak. You can redistribute it
-and/or modify it under the terms of the GNU General Public License as
-published by the Free Software Foundation, either version 3 of the
-License, or (at your option) any later version.
+
+Copyright \(C) 2017-2018 Nico Schottelius, Kamila Součková, Darko Poljak and
+Ľubomír Kučera. You can redistribute it and/or modify it under the terms of
+the GNU General Public License as published by the Free Software Foundation,
+either version 3 of the License, or (at your option) any later version.

cdist/conf/type/__letsencrypt_cert/manifest

@@ -1,5 +1,10 @@
-os=$(cat "$__global/explorer/os")
-os_version=$(cat "$__global/explorer/os_version")
+#!/bin/sh
+
+certbot_fullpath="$(cat "${__object:?}/explorer/certbot-path")"
+
+if [ -z "${certbot_fullpath}" ]; then
+	os="$(cat "${__global:?}/explorer/os")"
+	os_version="$(cat "${__global}/explorer/os_version")"
 
 	case "$os" in
 		debian)
@@ -10,8 +15,10 @@ case "$os" in
 						--distribution jessie-backports \
 						--component main
 
-                require="__apt_source/jessie-backports" __package_apt python-certbot --target-release jessie-backports
-                require="__apt_source/jessie-backports" __package_apt certbot --target-release jessie-backports
+					require="__apt_source/jessie-backports" __package_apt python-certbot \
+						--target-release jessie-backports
+					require="__apt_source/jessie-backports" __package_apt certbot \
+						--target-release jessie-backports
 					# Seems to be a missing dependency on debian 8
 					__package python-ndg-httpsclient
 				;;
@@ -21,8 +28,10 @@ case "$os" in
 						--distribution stretch-backports \
 						--component main
 
-                require="__apt_source/stretch-backports" __package_apt python-certbot --target-release stretch-backports
-                require="__apt_source/stretch-backports" __package_apt certbot --target-release stretch-backports
+					require="__apt_source/stretch-backports" __package_apt python-certbot \
+						--target-release stretch-backports
+					require="__apt_source/stretch-backports" __package_apt certbot \
+						--target-release stretch-backports
 				;;
 				*)
 					echo "Unsupported OS version: $os_version" >&2
@@ -40,8 +49,10 @@ case "$os" in
 								 --distribution jessie-backports \
 								 --component main
 
-                require="__apt_source/jessie-backports" __package_apt python-certbot --target-release jessie-backports
-                require="__apt_source/jessie-backports" __package_apt certbot --target-release jessie-backports
+					require="__apt_source/jessie-backports" __package_apt python-certbot \
+						--target-release jessie-backports
+					require="__apt_source/jessie-backports" __package_apt certbot \
+						--target-release jessie-backports
 					# Seems to be a missing dependency on debian 8
 					__package python-ndg-httpsclient
 				;;
@@ -63,17 +74,20 @@ case "$os" in
 			exit 1
 		;;
 	esac
+fi
 
-renew_hook_param="$__object/parameter/renew-hook"
+if [ -f "${__object}/parameter/automatic-renewal" ]; then
+	renew_hook_param="${__object}/parameter/renew-hook"
 	renew_hook=""
-if [ -f "$renew_hook_param" ]; then
+	if [ -f "${renew_hook_param}" ]; then
 		while read hook; do
-        renew_hook="$renew_hook --renew-hook \"$hook\""
-    done < "$renew_hook_param"
+			renew_hook="${renew_hook} --renew-hook \"${hook}\""
+		done < "${renew_hook_param}"
 	fi
 
 	__cron letsencrypt-certbot  \
 		--user root \
-    --command "$certbot_fullpath renew -q $renew_hook" \
+		--command "${certbot_fullpath} renew -q ${renew_hook}" \
 		--hour 0 \
 		--minute 47
+fi

cdist/conf/type/__letsencrypt_cert/parameter/boolean

@@ -0,0 +1,2 @@
+automatic-renewal
+staging

cdist/conf/type/__letsencrypt_cert/parameter/default/state

@@ -0,0 +1 @@
+present

cdist/conf/type/__letsencrypt_cert/parameter/optional

@@ -0,0 +1,2 @@
+state
+webroot

cdist/conf/type/__letsencrypt_cert/parameter/required

@@ -1,2 +1 @@
 admin-email
-webroot

cdist/conf/type/__letsencrypt_cert/parameter/required_multiple

@@ -0,0 +1 @@
+domain