Support email headers

DotBlue/Mandrill/AbstractMessage.php

@@ -405,4 +405,24 @@ public function removeImage(IAttachment $toBeRemoved)
 
 	/** @var string[] */
 	public $metadata = [];
+
+
+	/**
+	 * @return []
+	 */
+	public function getHeaders()
+	{
+		return $this->headers;
+	}
+
+
+	/**
+	 * @param string $header
+	 * @param string $value
+	 */
+	public function addHeader($header, $value)
+	{
+		$this->headers[$header] = $value;
+	}
+
 }

DotBlue/Mandrill/Exporters/MessageExporter.php

@@ -72,6 +72,9 @@ private function exportMessage(\DotBlue\Mandrill\IBasicMessage $message)
 				// Attachments
 				'attachments' => $this->exportAttachments($message->getAttachments()),
 				'images' => $this->exportAttachments($message->getImages()),
+
+				// Headers
+				'headers' => $message->getHeaders(),
 			],
 		]);
 	}

DotBlue/Mandrill/IBasicMessage.php

@@ -55,6 +55,12 @@ function getMergeVars();
 	function getAttachments();
 
 
+	/**
+	 * @return []
+	 */
+	function getHeaders();
+
+
 	/**
 	 * @return IAttachment[]
 	 */

tests/DotBlueTests/Mandrill/Exporters/MessageExporterTest.phpt

@@ -186,6 +186,8 @@ class MessageExporterTest extends \Tester\TestCase
 
 				'inline_css' => TRUE,
 				'preserve_recipients' => FALSE,
+
+				'headers' => [],
 			],
 			'async' => TRUE,
 			'ip_pool' => 'IP pool',

tests/DotBlueTests/Mandrill/MessageTest.phpt

@@ -32,6 +32,19 @@ class MessageTest extends \Tester\TestCase
 		Assert::same('<b>HTML!</b>', $message->getHtml());
 		Assert::same('HTML!', $message->getText());
 	}
+
+
+	public function testHeaders()
+	{
+		$message = new Message('dummy');
+		$message->addHeader('header1', 'value1');
+		$message->addHeader('header2', 'value2');
+
+		Assert::same([
+			'header1' => 'value1',
+			'header2' => 'value2',
+		], $message->getHeaders());
+	}
 }
 
 (new MessageTest())->run();

tests/DotBlueTests/Mandrill/TemplateMessageTest.phpt

@@ -50,6 +50,19 @@ class TemplateMessageTest extends \Tester\TestCase
 			'secondRegion' => 'yabadabadooo',
 		], $message->getEditableRegions());
 	}
+
+
+	public function testHeaders()
+	{
+		$message = new TemplateMessage('dummy');
+		$message->addHeader('header1', 'value1');
+		$message->addHeader('header2', 'value2');
+
+		Assert::same([
+			'header1' => 'value1',
+			'header2' => 'value2',
+		], $message->getHeaders());
+	}
 }
 
 (new TemplateMessageTest())->run();