move zip export into exportservice

[bookstack] / app / Entities / ExportService.php

diff --git a/app/Entities/ExportService.php b/app/Entities/ExportService.php
index f945dfbe4afe1d17246ca7119c6e776c4acf0455..b0e88b18bb7db42b9cfbd05242230740c15f48a9 100644 (file)
--- a/app/Entities/ExportService.php
+++ b/app/Entities/ExportService.php
@@ -6,7 +6,9 @@ use BookStack\Uploads\ImageService;
 use DomPDF;
 use Exception;
 use SnappyPDF;
+use League\HTMLToMarkdown\HtmlConverter;
 use Throwable;
+use ZipArchive;
 
 class ExportService
 {
@@ -225,4 +227,72 @@ class ExportService
         }
         return $text;
     }
+
+    /**
+     * Convert a page to a Markdown file.
+     * @throws Throwable
+     */
+    public function pageToMarkdown(Page $page)
+    {
+        if (property_exists($page, 'markdown') && $page->markdown != '') {
+            return "# " . $page->name . "\n\n" . $page->markdown;
+        } else {
+            $converter = new HtmlConverter();
+            return "# " . $page->name . "\n\n" . $converter->convert($page->html);
+        }
+    }
+
+    /**
+     * Convert a chapter to a Markdown file.
+     * @throws Throwable
+     */
+    public function chapterToMarkdown(Chapter $chapter)
+    {
+        $text = "# " . $chapter->name . "\n\n";
+        $text .= $chapter->description . "\n\n";
+        foreach ($chapter->pages as $page) {
+            $text .= $this->pageToMarkdown($page);
+        }
+        return $text;
+    }
+
+    /**
+     * Convert a book into a plain text string.
+     */
+    public function bookToMarkdown(Book $book): string
+    {
+        $bookTree = (new BookContents($book))->getTree(false, true);
+        $text = "# " . $book->name . "\n\n";
+        foreach ($bookTree as $bookChild) {
+            if ($bookChild->isA('chapter')) {
+                $text .= $this->chapterToMarkdown($bookChild);
+            } else {
+                $text .= $this->pageToMarkdown($bookChild);
+            }
+        }
+        return $text;
+    }
+
+    /**
+     * Convert a book into a zip file.
+     */
+    public function bookToZip(Book $book): string
+    {
+        // TODO: Is not unlinking the file a security risk?
+        $z = new ZipArchive();
+        $z->open("book.zip", \ZipArchive::CREATE | \ZipArchive::OVERWRITE);
+        $bookTree = (new BookContents($book))->getTree(false, true);
+        foreach ($bookTree as $bookChild) {
+            if ($bookChild->isA('chapter')) {
+                $z->addEmptyDir($bookChild->name);
+                foreach ($bookChild->pages as $page) {
+                    $filename = $bookChild->name . "/" . $page->name . ".md";
+                    $z->addFromString($filename, $this->pageToMarkdown($page));
+                }
+            } else {
+                $z->addFromString($bookChild->name . ".md", $this->pageToMarkdown($bookChild));
+            }
+        }
+        return "book.zip";
+    }
 }