- Work done on the kinda-micro-framework to allow smoother deployment

src/Response/DownloadResponse.php

@@ -0,0 +1,80 @@
+<?php declare(strict_types=1);
+
+namespace Lean\Response;
+
+use function get_class, gettype, is_object, is_string, sprintfm, pathinfo, PATHINFO_EXTENSION;
+
+use Psr\Http\Message\StreamInterface;
+
+use Zend\Diactoros\Exception,
+    Zend\Diactoros\Response,
+    Zend\Diactoros\Stream,
+    Zend\Diactoros\Response\InjectContentTypeTrait;
+
+/**
+ * PDF Response
+ *
+ * Allows creating a response by passing a string to the constructor;
+ * by default, sets a status code of 200 and sets the Content-Type header to
+ * application/pdf.
+ */
+class DownloadResponse extends Response
+{
+    use InjectContentTypeTrait;
+
+    /**
+     * Create a PDF response
+     *
+     * Produces a pdf response with a Content-Type of application/json and a default
+     * status of 200.
+     *
+     * @param string|StreamInterface $content String or stream for the message body.
+     * @param int $status Integer status code for the response; 200 by default.
+     * @param array $headers Array of headers to use at initialization.
+     * @throws Exception\InvalidArgumentException if $filepath is neither a string or stream.
+     */
+    public function __construct(string $content, string $filename, int $status = 200, array $headers = [])
+    {
+        parent::__construct(
+            $this->createBody($content),
+            $status,
+            $this->injectFilename($filename, $this->injectContentType("application/octet-stream", $headers))
+        );
+    }    
+    
+    /**
+     * Inject the provided Content-Type, if none is already present.
+     *
+     * @return array Headers with injected Content-Type
+     */
+    private function injectFilename(string $filename, array $headers) : array
+    {
+        $hasContentType = array_reduce(array_keys($headers), function ($carry, $item) {
+            return $carry ?: (strtolower($item) === 'content-disposition');
+        }, false);
+
+        if (! $hasContentType) {
+            $headers['content-disposition'] = ['Content-Disposition:attachment; filename="' . $filename . '"'];
+        }
+
+        return $headers;
+    }
+
+    /**
+     * Create the message body.
+     *
+     * @param string|StreamInterface $content
+     * @throws Exception\InvalidArgumentException if $content is neither a string or stream.
+     */
+    private function createBody(string $content) : StreamInterface
+    {
+        if ($content instanceof StreamInterface) {
+            return $content;
+        }
+
+        $body = new Stream('php://temp', 'wb+');
+        $body->write($content);
+        $body->rewind();
+        return $body;
+    }
+}