Played around with a new app structure

app/Entities/Controllers/BookExportController.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace BookStack\Entities\Controllers;
+
+use BookStack\Entities\Repos\BookRepo;
+use BookStack\Entities\Tools\ExportFormatter;
+use BookStack\Http\Controllers\Controller;
+use Throwable;
+
+class BookExportController extends Controller
+{
+    protected $bookRepo;
+    protected $exportFormatter;
+
+    /**
+     * BookExportController constructor.
+     */
+    public function __construct(BookRepo $bookRepo, ExportFormatter $exportFormatter)
+    {
+        $this->bookRepo = $bookRepo;
+        $this->exportFormatter = $exportFormatter;
+        $this->middleware('can:content-export');
+    }
+
+    /**
+     * Export a book as a PDF file.
+     *
+     * @throws Throwable
+     */
+    public function pdf(string $bookSlug)
+    {
+        $book = $this->bookRepo->getBySlug($bookSlug);
+        $pdfContent = $this->exportFormatter->bookToPdf($book);
+
+        return $this->download()->directly($pdfContent, $bookSlug . '.pdf');
+    }
+
+    /**
+     * Export a book as a contained HTML file.
+     *
+     * @throws Throwable
+     */
+    public function html(string $bookSlug)
+    {
+        $book = $this->bookRepo->getBySlug($bookSlug);
+        $htmlContent = $this->exportFormatter->bookToContainedHtml($book);
+
+        return $this->download()->directly($htmlContent, $bookSlug . '.html');
+    }
+
+    /**
+     * Export a book as a plain text file.
+     */
+    public function plainText(string $bookSlug)
+    {
+        $book = $this->bookRepo->getBySlug($bookSlug);
+        $textContent = $this->exportFormatter->bookToPlainText($book);
+
+        return $this->download()->directly($textContent, $bookSlug . '.txt');
+    }
+
+    /**
+     * Export a book as a markdown file.
+     */
+    public function markdown(string $bookSlug)
+    {
+        $book = $this->bookRepo->getBySlug($bookSlug);
+        $textContent = $this->exportFormatter->bookToMarkdown($book);
+
+        return $this->download()->directly($textContent, $bookSlug . '.md');
+    }
+}