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

src/Response/FileDownloadResponse.php

@@ -0,0 +1,77 @@
+<?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 FileDownloadResponse 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 $filepath 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 $filepath is neither a string or stream.
+     */
+    public function __construct($filepath, int $status = 200, array $headers = [])
+    {
+        $body = $this->createBody($filepath);
+        
+        parent::__construct(
+            $body,
+            $status,
+            $this->injectContentType( (new \Mimey\MimeTypes())->getMimeType( pathinfo($filepath, PATHINFO_EXTENSION) ), $headers)
+        );
+    }
+
+    /**
+     * Create the message body.
+     *
+     * @param string|StreamInterface $filepath
+     * @throws Exception\InvalidArgumentException if $filepath is neither a string or stream.
+     */
+    private function createBody($filepath) : StreamInterface
+    {
+        if ($filepath instanceof StreamInterface) {
+            return $filepath;
+        }
+
+        if (! is_string($filepath)) {
+            throw new Exception\InvalidArgumentException(sprintf(
+                'Invalid content (%s) provided to %s',
+                (is_object($filepath) ? get_class($filepath) : gettype($filepath)),
+                __CLASS__
+            ));
+        }
+        
+        if ( ! file_exists($filepath) ) {
+            throw new Exception\InvalidArgumentException("Given file (%s) do not look like a valid file path.", $filepath);
+        }
+
+        if ( ! is_readable($filepath) ) {
+            throw new Exception\InvalidArgumentException("Given file (%s) do not seem to be readable. This could indicate a permission problem", $filepath);
+        }
+        
+        return new Stream(fopen($filepath, "r"), 'r');
+    }
+}