Support reading SSL credentials from default locations

lib/proxy/settings/global.rb

@@ -47,5 +47,40 @@ def normalize_setting(key, value, how_to)
       return value unless how_to.has_key?(key)
       how_to[key].call(value)
     end
+
+    def ssl_private_key
+      credential(:ssl_private_key, 'server-key')
+    end
+
+    def ssl_certificate
+      credential(:ssl_certificate, 'server-certificate')
+    end
+
+    def ssl_ca_file
+      credential(:ssl_ca_file, 'server-client-ca')
+    end
+
+    def foreman_ssl_key
+      credential(:foreman_ssl_key, 'client-key')
+    end
+
+    def foreman_ssl_cert
+      credential(:foreman_ssl_cert, 'client-certificate')
+    end
+
+    def foreman_ssl_key
+      credential(:foreman_ssl_ca, 'client-ca')
+    end
+
+    private
+
+    def credential(setting, cred)
+      value = self[cred]
+      if !value && ENV.key?('CREDENTIALS_DIRECTORY')
+        path = File.join(ENV['CREDENTIALS_DIRECTORY'], cred)
+        value = path if File.exist?(path)
+      end
+      value
+    end
   end
 end

test/global_settings_test.rb

@@ -26,4 +26,34 @@ def test_bind_host_is_normalized
     assert_equal ['127.0.0.1'], ::Proxy::Settings::Global.new(:bind_host => '127.0.0.1').bind_host
     assert_equal ['127.0.0.1'], ::Proxy::Settings::Global.new(:bind_host => ['127.0.0.1']).bind_host
   end
+
+  def test_ssl_private_key_default_without_credential
+    settings = ::Proxy::Settings::Global.new({})
+    Dir.mktmpdir do |tmpdir|
+      ENV['CREDENTIALS_DIRECTORY'] = tmpdir
+      assert_nil settings.ssl_private_key
+    end
+  end
+
+  def test_ssl_private_key_default_with_credential
+    settings = ::Proxy::Settings::Global.new({})
+    Dir.mktmpdir do |tmpdir|
+      ENV['CREDENTIALS_DIRECTORY'] = tmpdir
+      path = File.join(tmpdir, 'server-key')
+      FileUtils.touch(path)
+
+      assert_equal path, settings.ssl_private_key
+    end
+  end
+
+  def test_ssl_private_key_with_value
+    settings = ::Proxy::Settings::Global.new({ssl_private_key: 'mykey'})
+    Dir.mktmpdir do |tmpdir|
+      ENV['CREDENTIALS_DIRECTORY'] = tmpdir
+      path = File.join(tmpdir, 'server-key')
+      FileUtils.touch(path)
+
+      assert_equal 'mykey', settings.ssl_private_key
+    end
+  end
 end