Introduce Response for Modules to create a testable way for module responses

src/Module/Response.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Friendica\Module;
+
+use Friendica\Capabilities\ICanReadAndWriteToResponds;
+use Friendica\Capabilities\IRespondToRequests;
+use Friendica\Network\HTTPException\InternalServerErrorException;
+
+class Response implements ICanReadAndWriteToResponds
+{
+	/**
+	 * @var string[][]
+	 */
+	protected $headers = [];
+	/**
+	 * @var string
+	 */
+	protected $content = '';
+	/**
+	 * @var string
+	 */
+	protected $type = IRespondToRequests::TYPE_CONTENT;
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function addHeader(string $key, string $value)
+	{
+		$this->headers[$key][] = $value;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function addContent(string $content)
+	{
+		$this->content .= $content;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getHeaders(): array
+	{
+		return $this->headers;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getContent(): string
+	{
+		return $this->content;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function setType(string $type)
+	{
+		if (!in_array($type, IRespondToRequests::ALLOWED_TYPES)) {
+			throw new InternalServerErrorException('wrong type');
+		}
+
+		$this->type = $type;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getTyp(): string
+	{
+		return $this->type;
+	}
+}