Add support for headers in native mailer

DependencyInjection/Configuration.php

@@ -175,6 +175,7 @@
  *   - subject: string
  *   - [level]: level name or int value, defaults to DEBUG
  *   - [bubble]: bool, defaults to true
+ *   - [headers]: optional array containing additional headers: ['Foo: Bar', '...']
  *
  * - socket:
  *   - connection_string: string
@@ -347,6 +348,7 @@ public function getConfigTreeBuilder()
                         ->fixXmlConfig('excluded_http_code')
                         ->fixXmlConfig('tag')
                         ->fixXmlConfig('accepted_level')
+                        ->fixXmlConfig('header')
                         ->canBeUnset()
                         ->children()
                             ->scalarNode('type')
@@ -594,6 +596,10 @@ public function getConfigTreeBuilder()
                             ->end()
                             ->scalarNode('subject')->end() // swift_mailer and native_mailer
                             ->scalarNode('content_type')->defaultNull()->end() // swift_mailer
+                            ->arrayNode('headers') // native_mailer
+                                ->canBeUnset()
+                                ->scalarPrototype()->end()
+                            ->end()
                             ->scalarNode('mailer')->defaultValue('mailer')->end() // swift_mailer
                             ->arrayNode('email_prototype') // swift_mailer
                                 ->canBeUnset()

DependencyInjection/MonologExtension.php

@@ -540,6 +540,9 @@ private function buildHandler(ContainerBuilder $container, $name, array $handler
                 $handler['level'],
                 $handler['bubble'],
             ));
+            if (!empty($handler['headers'])) {
+                $definition->addMethodCall('addHeader', [$handler['headers']]);
+            }
             break;
 
         case 'socket':

Resources/config/schema/monolog-1.0.xsd

@@ -28,6 +28,7 @@
             <xsd:element name="tag" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
             <xsd:element name="accepted-level" type="level" minOccurs="0" maxOccurs="unbounded" />
             <xsd:element name="to-email" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
+            <xsd:element name="header" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
         </xsd:sequence>
         <xsd:attribute name="type" type="xsd:string" />
         <xsd:attribute name="priority" type="xsd:integer" />
@@ -186,4 +187,10 @@
         </xsd:choice>
         <xsd:attribute name="code" type="xsd:integer" />
     </xsd:complexType>
+
+    <xsd:complexType name="headers">
+        <xsd:sequence>
+            <xsd:any minOccurs="0" processContents="lax"/>
+        </xsd:sequence>
+    </xsd:complexType>
 </xsd:schema>

Tests/DependencyInjection/FixtureMonologExtensionTest.php

@@ -216,6 +216,17 @@ public function testPsr3MessageProcessingDisabled()
         $this->assertNotContains(array('pushProcessor', array(new Reference('monolog.processor.psr_log_message'))), $methodCalls, 'The PSR-3 processor should not be enabled', false, false);
     }
 
+    public function testNativeMailer()
+    {
+        $container = $this->getContainer('native_mailer');
+
+        $logger = $container->getDefinition('monolog.handler.mailer');
+        $methodCalls = $logger->getMethodCalls();
+
+        $this->assertCount(2, $methodCalls);
+        $this->assertSame(['addHeader', [['Foo: bar', 'Baz: inga']]], $methodCalls[1]);
+    }
+
     protected function getContainer($fixture)
     {
         $container = new ContainerBuilder();

Tests/DependencyInjection/Fixtures/xml/native_mailer.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" ?>
+
+<srv:container xmlns="http://symfony.com/schema/dic/monolog"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:srv="http://symfony.com/schema/dic/services"
+    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                        http://symfony.com/schema/dic/monolog http://symfony.com/schema/dic/monolog/monolog-1.0.xsd">
+
+    <config>
+        <handler name="mailer" type="native_mailer" to-email="foo@example.com" from-email="bar@example.com" subject="a subject">
+            <header>Foo: bar</header>
+            <header>Baz: inga</header>
+        </handler>
+    </config>
+</srv:container>

Tests/DependencyInjection/Fixtures/yml/native_mailer.yml

@@ -0,0 +1,10 @@
+monolog:
+    handlers:
+        mailer:
+            type: native_mailer
+            from_email: foo@example.com
+            to_email: bar@exemple.com
+            subject: a subject
+            headers:
+                - "Foo: bar"
+                - "Baz: inga"