Split out export actions into own controllers

app/Http/Controllers/ChapterExportController.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace BookStack\Http\Controllers;
+
+use BookStack\Entities\ExportService;
+use BookStack\Entities\Repos\EntityRepo;
+use BookStack\Exceptions\NotFoundException;
+use Illuminate\Http\Response;
+use Throwable;
+
+class ChapterExportController extends Controller
+{
+    /**
+     * @var EntityRepo
+     */
+    protected $entityRepo;
+
+    /**
+     * @var ExportService
+     */
+    protected $exportService;
+
+    /**
+     * ChapterExportController constructor.
+     * @param EntityRepo $entityRepo
+     * @param ExportService $exportService
+     */
+    public function __construct(EntityRepo $entityRepo, ExportService $exportService)
+    {
+        $this->entityRepo = $entityRepo;
+        $this->exportService = $exportService;
+        parent::__construct();
+    }
+
+    /**
+     * Exports a chapter to pdf .
+     * @param string $bookSlug
+     * @param string $chapterSlug
+     * @return Response
+     * @throws NotFoundException
+     * @throws Throwable
+     */
+    public function pdf(string $bookSlug, string $chapterSlug)
+    {
+        $chapter = $this->entityRepo->getBySlug('chapter', $chapterSlug, $bookSlug);
+        $pdfContent = $this->exportService->chapterToPdf($chapter);
+        return $this->downloadResponse($pdfContent, $chapterSlug . '.pdf');
+    }
+
+    /**
+     * Export a chapter to a self-contained HTML file.
+     * @param string $bookSlug
+     * @param string $chapterSlug
+     * @return Response
+     * @throws NotFoundException
+     * @throws Throwable
+     */
+    public function html(string $bookSlug, string $chapterSlug)
+    {
+        $chapter = $this->entityRepo->getBySlug('chapter', $chapterSlug, $bookSlug);
+        $containedHtml = $this->exportService->chapterToContainedHtml($chapter);
+        return $this->downloadResponse($containedHtml, $chapterSlug . '.html');
+    }
+
+    /**
+     * Export a chapter to a simple plaintext .txt file.
+     * @param string $bookSlug
+     * @param string $chapterSlug
+     * @return Response
+     * @throws NotFoundException
+     */
+    public function plainText(string $bookSlug, string $chapterSlug)
+    {
+        $chapter = $this->entityRepo->getBySlug('chapter', $chapterSlug, $bookSlug);
+        $chapterText = $this->exportService->chapterToPlainText($chapter);
+        return $this->downloadResponse($chapterText, $chapterSlug . '.txt');
+    }
+}