Cleaned up namespacing in routes

Also moved home controller and moved controllers up a level in http.

app/Http/DownloadResponseFactory.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace BookStack\Http;
+
+use BookStack\Util\WebSafeMimeSniffer;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+
+class DownloadResponseFactory
+{
+    protected Request $request;
+
+    public function __construct(Request $request)
+    {
+        $this->request = $request;
+    }
+
+    /**
+     * Create a response that directly forces a download in the browser.
+     */
+    public function directly(string $content, string $fileName): Response
+    {
+        return response()->make($content, 200, $this->getHeaders($fileName));
+    }
+
+    /**
+     * Create a response that forces a download, from a given stream of content.
+     */
+    public function streamedDirectly($stream, string $fileName): StreamedResponse
+    {
+        return response()->stream(function () use ($stream) {
+
+            // End & flush the output buffer, if we're in one, otherwise we still use memory.
+            // Output buffer may or may not exist depending on PHP `output_buffering` setting.
+            // Ignore in testing since output buffers are used to gather a response.
+            if (!empty(ob_get_status()) && !app()->runningUnitTests()) {
+                ob_end_clean();
+            }
+
+            fpassthru($stream);
+            fclose($stream);
+        }, 200, $this->getHeaders($fileName));
+    }
+
+    /**
+     * Create a file download response that provides the file with a content-type
+     * correct for the file, in a way so the browser can show the content in browser,
+     * for a given content stream.
+     */
+    public function streamedInline($stream, string $fileName): StreamedResponse
+    {
+        $sniffContent = fread($stream, 2000);
+        $mime = (new WebSafeMimeSniffer())->sniff($sniffContent);
+
+        return response()->stream(function () use ($sniffContent, $stream) {
+            echo $sniffContent;
+            fpassthru($stream);
+            fclose($stream);
+        }, 200, $this->getHeaders($fileName, $mime));
+    }
+
+    /**
+     * Get the common headers to provide for a download response.
+     */
+    protected function getHeaders(string $fileName, string $mime = 'application/octet-stream'): array
+    {
+        $disposition = ($mime === 'application/octet-stream') ? 'attachment' : 'inline';
+        $downloadName = str_replace('"', '', $fileName);
+
+        return [
+            'Content-Type'           => $mime,
+            'Content-Disposition'    => "{$disposition}; filename=\"{$downloadName}\"",
+            'X-Content-Type-Options' => 'nosniff',
+        ];
+    }
+}