Add HDM smart proxy plugin

The HDM Smart Proxy plugins needs a configuration file, which specifies:
- the HDM URL
- optional HDM user and password

User and password can be omitted, if HDM runs without authentication.

Author: tuxmea

manifests/plugin/hdm.pp

@@ -0,0 +1,37 @@
+# = Foreman Proxy HDM plugin
+#
+# This class installs the HDM plugin
+#
+# === Parameters:
+#
+# $hdm_url::                  the API endpoint of your HDM installation
+#
+# $hdm_user::                 email address of the API-role user inside of HDM - can be ommited if HDM runs unauthenticated
+#
+# $hdm_password::             password of the HDM API user - can be ommited if HDM runs unauthenticated
+#
+# === Advanced parameters:
+#
+# $enabled::                  enables/disables the HDM plugin
+#
+# $listen_on::                proxy feature listens on http, https, or both
+#
+# $version::                  plugin package version, it's passed to ensure parameter of package resource
+#                             can be set to specific version number, 'latest', 'present' etc.
+#
+class foreman_proxy::plugin::hdm (
+  String[1]               $hdm_url,
+  Optional[String]        $version      = undef,
+  Boolean                 $enabled      = true,
+  Foreman_proxy::ListenOn $listen_on    = 'https',
+  Optional[String[1]]     $hdm_user     = undef,
+  Optional[String[1]]     $hdm_password = undef,
+) {
+  foreman_proxy::plugin::module { 'hdm':
+    template_path => 'foreman_proxy/plugin/hdm.yml.erb',
+    enabled       => $enabled,
+    feature       => 'HDM',
+    listen_on     => $listen_on,
+    version       => $version,
+  }
+}

spec/classes/foreman_proxy__plugin__hdm_spec.rb

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+require 'spec_helper'
+
+describe 'foreman_proxy::plugin::hdm' do
+  on_plugin_os.each do |os, os_facts|
+    context "on #{os}" do
+      let(:facts) { os_facts }
+      let(:pre_condition) { 'include foreman_proxy' }
+      let(:etc_dir) { '/etc' }
+      let(:params) do
+        {
+          hdm_url: 'http://foreman.betadots.training:3000',
+          hdm_user: '[email protected]',
+          hdm_password: '1234567890'
+        }
+      end
+
+      describe 'with default settings' do
+        it { is_expected.to compile.with_all_deps }
+        it { is_expected.to contain_foreman_proxy__plugin('hdm') }
+
+        it 'should configure hdm.yml' do
+          is_expected.to contain_file("#{etc_dir}/foreman-proxy/settings.d/hdm.yml")
+            .with_ensure('file')
+            .with_owner('root')
+            .with_group('foreman-proxy')
+
+          verify_exact_contents(catalogue, "#{etc_dir}/foreman-proxy/settings.d/hdm.yml", [
+                                  '---',
+                                  ':enabled: https',
+                                  ":hdm_url: 'http://foreman.betadots.training:3000'",
+                                  ":hdm_user: '[email protected]'",
+                                  ":hdm_password: '1234567890'"
+                                ])
+        end
+      end
+    end
+  end
+end

templates/plugin/hdm.yml.erb

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+# HDM Smart Proxy
+---
+:enabled: <%= @module_enabled %>
+:hdm_url: '<%= scope.lookupvar("foreman_proxy::plugin::hdm::hdm_url") %>'
+<%- if scope.lookupvar("foreman_proxy::plugin::hdm::hdm_user") and scope.lookupvar("foreman_proxy::plugin::hdm::hdm_password") -%>
+:hdm_user: '<%= scope.lookupvar("foreman_proxy::plugin::hdm::hdm_user") %>'
+:hdm_password: '<%= scope.lookupvar("foreman_proxy::plugin::hdm::hdm_password") %>'
+<%- end -%>