Add mod_proxy_http2 support

This adds a module class to include the Apache module. For every vhost
it also inspects the configured proxy if the module is required.

manifests/mod/proxy_http2.pp

@@ -0,0 +1,9 @@
+# @summary
+#   Installs `mod_proxy_http2`.
+#
+# @see https://httpd.apache.org/docs/current/mod/mod_proxy_http2.html for additional documentation.
+#
+class apache::mod::proxy_http2 {
+  require apache::mod::proxy
+  apache::mod { 'proxy_http2': }
+}

manifests/vhost.pp

@@ -2303,6 +2303,21 @@
 
       if $directory['provider'] and $directory['provider'] =~ 'location' and ('proxy_pass' in $directory or 'proxy_pass_match' in $directory) {
         include apache::mod::proxy_http
+
+        # To match processing in templates/vhost/_directories.erb
+        if $directory['proxy_pass_match'] {
+          Array($directory['proxy_pass_match']).each |$proxy| {
+            if $proxy['url'] =~ /"h2c?:\/\// {
+              include apache::mod::proxy_http2
+            }
+          }
+        } elsif $directory['proxy_pass'] {
+          Array($directory['proxy_pass']).each |$proxy| {
+            if $proxy['url'] =~ /"h2c?:\/\// {
+              include apache::mod::proxy_http2
+            }
+          }
+        }
       }
 
       if 'request_headers' in $directory {
@@ -2453,6 +2468,16 @@
   if ($proxy_dest or $proxy_pass or $proxy_pass_match or $proxy_dest_match or $proxy_preserve_host or ($proxy_add_headers =~ NotUndef)) and $ensure == 'present' {
     include apache::mod::proxy_http
 
+    # To match processing in templates/vhost/_proxy.erb
+    if $proxy_dest =~ Pattern[/^h2c?:\/\//] or $proxy_dest_match =~ Pattern[/^h2c?:\/\//] {
+      include apache::mod::proxy_http2
+    }
+    [$proxy_pass, $proxy_pass_match].flatten.each |$proxy| {
+      if $proxy and $proxy['url'] =~ Pattern[/^h2c?:\/\//] {
+        include apache::mod::proxy_http2
+      }
+    }
+
     concat::fragment { "${name}-proxy":
       target  => "${priority_real}${filename}.conf",
       order   => 170,

manifests/vhost/proxy.pp

@@ -124,6 +124,16 @@
   include apache::mod::proxy
   include apache::mod::proxy_http
 
+  # To match processing in templates/vhost/_proxy.erb
+  if $proxy_dest =~ Pattern[/^h2c?:\/\//] or $proxy_dest_match =~ Pattern[/^h2c?:\/\//] {
+    include apache::mod::proxy_http2
+  }
+  [$proxy_pass, $proxy_pass_match].flatten.each |$proxy| {
+    if $proxy and $proxy['url'] =~ Pattern[/^h2c?:\/\//] {
+      include apache::mod::proxy_http2
+    }
+  }
+
   unless $proxy_dest or $proxy_pass or $proxy_pass_match or $proxy_dest_match {
     fail('At least one of proxy_dest, proxy_pass, proxy_pass_match or proxy_dest_match must be given')
   }

spec/classes/mod/proxy_http2_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'apache::mod::proxy_http2' do
+  on_supported_os.each do |os, os_facts|
+    context "on #{os}" do
+      let(:facts) { os_facts }
+
+      it { is_expected.to compile.with_all_deps }
+      it { is_expected.to contain_class('apache::mod::proxy') }
+      it { is_expected.to contain_apache__mod('proxy_http2') }
+    end
+  end
+end

spec/defines/vhost_proxy_spec.rb

@@ -53,6 +53,56 @@
                 CONTENT
               )
           end
+
+          context 'with HTTP/2 proxy_dest URL' do
+            let(:params) do
+              super().merge(proxy_dest: 'h2://localhost:8080/')
+            end
+
+            it { is_expected.to compile.with_all_deps }
+            it { is_expected.to contain_class('apache::mod::proxy_http2') }
+          end
+
+          context 'with HTTP/2 proxy_dest_match URL' do
+            let(:params) do
+              super().merge(proxy_dest_match: 'h2://localhost:8080/')
+            end
+
+            it { is_expected.to compile.with_all_deps }
+            it { is_expected.to contain_class('apache::mod::proxy_http2') }
+          end
+
+          context 'with HTTP/2 proxy_pass URL' do
+            let(:params) do
+              super().merge(
+                proxy_pass: [
+                  {
+                    path: '/',
+                    url: 'h2://localhost:8080/'
+                  },
+                ],
+              )
+            end
+
+            it { is_expected.to compile.with_all_deps }
+            it { is_expected.to contain_class('apache::mod::proxy_http2') }
+          end
+
+          context 'with HTTP/2 proxy_pass_match URL' do
+            let(:params) do
+              super().merge(
+                proxy_pass_match: [
+                  {
+                    path: '/',
+                    url: 'h2://localhost:8080/'
+                  },
+                ],
+              )
+            end
+
+            it { is_expected.to compile.with_all_deps }
+            it { is_expected.to contain_class('apache::mod::proxy_http2') }
+          end
         end
       end
     end