--- /dev/null
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Stdlib;
+
+use Traversable;
+
+class Message implements MessageInterface
+{
+ /**
+ * @var array
+ */
+ protected $metadata = [];
+
+ /**
+ * @var string
+ */
+ protected $content = '';
+
+ /**
+ * Set message metadata
+ *
+ * Non-destructive setting of message metadata; always adds to the metadata, never overwrites
+ * the entire metadata container.
+ *
+ * @param string|int|array|Traversable $spec
+ * @param mixed $value
+ * @throws Exception\InvalidArgumentException
+ * @return Message
+ */
+ public function setMetadata($spec, $value = null)
+ {
+ if (is_scalar($spec)) {
+ $this->metadata[$spec] = $value;
+ return $this;
+ }
+ if (! is_array($spec) && ! $spec instanceof Traversable) {
+ throw new Exception\InvalidArgumentException(sprintf(
+ 'Expected a string, array, or Traversable argument in first position; received "%s"',
+ (is_object($spec) ? get_class($spec) : gettype($spec))
+ ));
+ }
+ foreach ($spec as $key => $value) {
+ $this->metadata[$key] = $value;
+ }
+ return $this;
+ }
+
+ /**
+ * Retrieve all metadata or a single metadatum as specified by key
+ *
+ * @param null|string|int $key
+ * @param null|mixed $default
+ * @throws Exception\InvalidArgumentException
+ * @return mixed
+ */
+ public function getMetadata($key = null, $default = null)
+ {
+ if (null === $key) {
+ return $this->metadata;
+ }
+
+ if (! is_scalar($key)) {
+ throw new Exception\InvalidArgumentException('Non-scalar argument provided for key');
+ }
+
+ if (array_key_exists($key, $this->metadata)) {
+ return $this->metadata[$key];
+ }
+
+ return $default;
+ }
+
+ /**
+ * Set message content
+ *
+ * @param mixed $value
+ * @return Message
+ */
+ public function setContent($value)
+ {
+ $this->content = $value;
+ return $this;
+ }
+
+ /**
+ * Get message content
+ *
+ * @return mixed
+ */
+ public function getContent()
+ {
+ return $this->content;
+ }
+
+ /**
+ * @return string
+ */
+ public function toString()
+ {
+ $request = '';
+ foreach ($this->getMetadata() as $key => $value) {
+ $request .= sprintf(
+ "%s: %s\r\n",
+ (string) $key,
+ (string) $value
+ );
+ }
+ $request .= "\r\n" . $this->getContent();
+ return $request;
+ }
+}