Added book export and created export tests to cover

In reference to #177

app/Http/Controllers/BookController.php

@@ -3,6 +3,7 @@
 use Activity;
 use BookStack\Repos\EntityRepo;
 use BookStack\Repos\UserRepo;
+use BookStack\Services\ExportService;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
 use Views;
@@ -12,16 +13,19 @@ class BookController extends Controller
 
     protected $entityRepo;
     protected $userRepo;
+    protected $exportService;
 
     /**
      * BookController constructor.
      * @param EntityRepo $entityRepo
      * @param UserRepo $userRepo
+     * @param ExportService $exportService
      */
-    public function __construct(EntityRepo $entityRepo, UserRepo $userRepo)
+    public function __construct(EntityRepo $entityRepo, UserRepo $userRepo, ExportService $exportService)
     {
         $this->entityRepo = $entityRepo;
         $this->userRepo = $userRepo;
+        $this->exportService = $exportService;
         parent::__construct();
     }
 
@@ -258,4 +262,49 @@ class BookController extends Controller
         session()->flash('success', trans('entities.books_permissions_updated'));
         return redirect($book->getUrl());
     }
+
+    /**
+     * Export a book as a PDF file.
+     * @param string $bookSlug
+     * @return mixed
+     */
+    public function exportPdf($bookSlug)
+    {
+        $book = $this->entityRepo->getBySlug('book', $bookSlug);
+        $pdfContent = $this->exportService->bookToPdf($book);
+        return response()->make($pdfContent, 200, [
+            'Content-Type'        => 'application/octet-stream',
+            'Content-Disposition' => 'attachment; filename="' . $bookSlug . '.pdf'
+        ]);
+    }
+
+    /**
+     * Export a book as a contained HTML file.
+     * @param string $bookSlug
+     * @return mixed
+     */
+    public function exportHtml($bookSlug)
+    {
+        $book = $this->entityRepo->getBySlug('book', $bookSlug);
+        $htmlContent = $this->exportService->bookToContainedHtml($book);
+        return response()->make($htmlContent, 200, [
+            'Content-Type'        => 'application/octet-stream',
+            'Content-Disposition' => 'attachment; filename="' . $bookSlug . '.html'
+        ]);
+    }
+
+    /**
+     * Export a book as a plain text file.
+     * @param $bookSlug
+     * @return mixed
+     */
+    public function exportPlainText($bookSlug)
+    {
+        $book = $this->entityRepo->getBySlug('book', $bookSlug);
+        $htmlContent = $this->exportService->bookToPlainText($book);
+        return response()->make($htmlContent, 200, [
+            'Content-Type'        => 'application/octet-stream',
+            'Content-Disposition' => 'attachment; filename="' . $bookSlug . '.txt'
+        ]);
+    }
 }

app/Http/Controllers/PageController.php

@@ -439,7 +439,6 @@ class PageController extends Controller
     {
         $page = $this->entityRepo->getBySlug('page', $pageSlug, $bookSlug);
         $pdfContent = $this->exportService->pageToPdf($page);
-//        return $pdfContent;
         return response()->make($pdfContent, 200, [
             'Content-Type'        => 'application/octet-stream',
             'Content-Disposition' => 'attachment; filename="' . $pageSlug . '.pdf'

app/Repos/EntityRepo.php

@@ -313,11 +313,12 @@ class EntityRepo
      * Loads the book slug onto child elements to prevent access database access for getting the slug.
      * @param Book $book
      * @param bool $filterDrafts
+     * @param bool $renderPages
      * @return mixed
      */
-    public function getBookChildren(Book $book, $filterDrafts = false)
+    public function getBookChildren(Book $book, $filterDrafts = false, $renderPages = false)
     {
-        $q = $this->permissionService->bookChildrenQuery($book->id, $filterDrafts)->get();
+        $q = $this->permissionService->bookChildrenQuery($book->id, $filterDrafts, $renderPages)->get();
         $entities = [];
         $parents = [];
         $tree = [];
@@ -325,6 +326,10 @@ class EntityRepo
         foreach ($q as $index => $rawEntity) {
             if ($rawEntity->entity_type === 'BookStack\\Page') {
                 $entities[$index] = $this->page->newFromBuilder($rawEntity);
+                if ($renderPages) {
+                    $entities[$index]->html = $rawEntity->description;
+                    $entities[$index]->html = $this->renderPage($entities[$index]);
+                };
             } else if ($rawEntity->entity_type === 'BookStack\\Chapter') {
                 $entities[$index] = $this->chapter->newFromBuilder($rawEntity);
                 $key = $entities[$index]->entity_type . ':' . $entities[$index]->id;

app/Services/ExportService.php

@@ -1,5 +1,6 @@
 <?php namespace BookStack\Services;
 
+use BookStack\Book;
 use BookStack\Page;
 use BookStack\Repos\EntityRepo;
 
@@ -25,24 +26,69 @@ class ExportService
      */
     public function pageToContainedHtml(Page $page)
     {
-        $cssContent = file_get_contents(public_path('/css/export-styles.css'));
-        $pageHtml = view('pages/export', ['page' => $page, 'pageContent' => $this->entityRepo->renderPage($page), 'css' => $cssContent])->render();
+        $pageHtml = view('pages/export', [
+            'page' => $page,
+            'pageContent' => $this->entityRepo->renderPage($page)
+        ])->render();
         return $this->containHtml($pageHtml);
     }
 
     /**
-     * Convert a page to a pdf file.
+     * Convert a book to a self-contained HTML file.
+     * @param Book $book
+     * @return mixed|string
+     */
+    public function bookToContainedHtml(Book $book)
+    {
+        $bookTree = $this->entityRepo->getBookChildren($book, true, true);
+        $html = view('books/export', [
+            'book' => $book,
+            'bookChildren' => $bookTree
+        ])->render();
+        return $this->containHtml($html);
+    }
+
+    /**
+     * Convert a page to a PDF file.
      * @param Page $page
      * @return mixed|string
      */
     public function pageToPdf(Page $page)
     {
-        $cssContent = file_get_contents(public_path('/css/export-styles.css'));
-        $pageHtml = view('pages/pdf', ['page' => $page, 'pageContent' => $this->entityRepo->renderPage($page), 'css' => $cssContent])->render();
+        $html = view('pages/pdf', [
+            'page' => $page,
+            'pageContent' => $this->entityRepo->renderPage($page)
+        ])->render();
+        return $this->htmlToPdf($html);
+    }
+
+    /**
+     * Convert a book to a PDF file
+     * @param Book $book
+     * @return string
+     */
+    public function bookToPdf(Book $book)
+    {
+        $bookTree = $this->entityRepo->getBookChildren($book, true, true);
+        $html = view('books/export', [
+            'book' => $book,
+            'bookChildren' => $bookTree
+        ])->render();
+        return $this->htmlToPdf($html);
+    }
+
+    /**
+     * Convert normal webpage HTML to a PDF.
+     * @param $html
+     * @return string
+     */
+    protected function htmlToPdf($html)
+    {
+        $containedHtml = $this->containHtml($html);
         $useWKHTML = config('snappy.pdf.binary') !== false;
-        $containedHtml = $this->containHtml($pageHtml);
         if ($useWKHTML) {
             $pdf = \SnappyPDF::loadHTML($containedHtml);
+            $pdf->setOption('print-media-type', true);
         } else {
             $pdf = \PDF::loadHTML($containedHtml);
         }
@@ -122,6 +168,29 @@ class ExportService
         return $text;
     }
 
+    /**
+     * Convert a book into a plain text string.
+     * @param Book $book
+     * @return string
+     */
+    public function bookToPlainText(Book $book)
+    {
+        $bookTree = $this->entityRepo->getBookChildren($book, true, true);
+        $text = $book->name . "\n\n";
+        foreach ($bookTree as $bookChild) {
+            if ($bookChild->isA('chapter')) {
+                $text .= $bookChild->name . "\n\n";
+                $text .= $bookChild->description . "\n\n";
+                foreach ($bookChild->pages as $page) {
+                    $text .= $this->pageToPlainText($page);
+                }
+            } else {
+                $text .= $this->pageToPlainText($bookChild);
+            }
+        }
+        return $text;
+    }
+
 }
 
 

app/Services/PermissionService.php

@@ -474,11 +474,13 @@ class PermissionService
     /**
      * Get the children of a book in an efficient single query, Filtered by the permission system.
      * @param integer $book_id
-     * @param bool    $filterDrafts
+     * @param bool $filterDrafts
+     * @param bool $fetchPageContent
      * @return \Illuminate\Database\Query\Builder
      */
-    public function bookChildrenQuery($book_id, $filterDrafts = false) {
-        $pageSelect = $this->db->table('pages')->selectRaw("'BookStack\\\\Page' as entity_type, id, slug, name, text, '' as description, book_id, priority, chapter_id, draft")->where('book_id', '=', $book_id)->where(function($query) use ($filterDrafts) {
+    public function bookChildrenQuery($book_id, $filterDrafts = false, $fetchPageContent = false) {
+        $pageContentSelect = $fetchPageContent ? 'html' : "''";
+        $pageSelect = $this->db->table('pages')->selectRaw("'BookStack\\\\Page' as entity_type, id, slug, name, text, {$pageContentSelect} as description, book_id, priority, chapter_id, draft")->where('book_id', '=', $book_id)->where(function($query) use ($filterDrafts) {
             $query->where('draft', '=', 0);
             if (!$filterDrafts) {
                 $query->orWhere(function($query) {