PDF: Started building system to allow custom DOMPDF font loading

app/Config/exports.php

@@ -68,7 +68,7 @@ return [
          * Times-Roman, Times-Bold, Times-BoldItalic, Times-Italic,
          * Symbol, ZapfDingbats.
          */
-        'font_dir' => storage_path('fonts/'),  // advised by dompdf (https://github.com/dompdf/dompdf/pull/782)
+        'font_dir' => storage_path('fonts/dompdf'),  // advised by dompdf (https://github.com/dompdf/dompdf/pull/782)
 
         /**
          * The location of the DOMPDF font cache directory.
@@ -78,7 +78,7 @@ return [
          *
          * Note: This directory must exist and be writable by the webserver process.
          */
-        'font_cache' => storage_path('fonts/'),
+        'font_cache' => storage_path('fonts/dompdf/cache'),
 
         /**
          * The location of a temporary directory.

app/Exports/PdfGenerator.php

@@ -4,6 +4,8 @@ namespace BookStack\Exports;
 
 use BookStack\Exceptions\PdfExportException;
 use Dompdf\Dompdf;
+use FontLib\Font;
+use Illuminate\Support\Str;
 use Knp\Snappy\Pdf as SnappyPdf;
 use Symfony\Component\Process\Exception\ProcessTimedOutException;
 use Symfony\Component\Process\Process;
@@ -60,12 +62,57 @@ class PdfGenerator
         $domPdf = new Dompdf($options);
         $domPdf->setBasePath(base_path('public'));
 
+        $fontMetrics = $domPdf->getFontMetrics();
+        $userFontfamilies = $this->getUserDomPdfFontFamilies();
+        foreach ($userFontfamilies as $fontFamily => $fonts) {
+            $fontMetrics->setFontFamily($fontFamily, $fonts);
+        }
+
+//        dd($userFontfamilies, $fontMetrics->getFontFamilies());
         $domPdf->loadHTML($this->convertEntities($html));
         $domPdf->render();
 
         return (string) $domPdf->output();
     }
 
+    /**
+     * @return array<string, array<string, string>>
+     */
+    protected function getUserDomPdfFontFamilies(): array
+    {
+        $fontStore = storage_path('fonts/dompdf');
+        if (!is_dir($fontStore)) {
+            return [];
+        }
+
+        $fontFamilies = [];
+        $fontFiles = glob($fontStore . DIRECTORY_SEPARATOR . '*.ttf');
+        foreach ($fontFiles as $fontFile) {
+            $fontFileName = basename($fontFile, '.ttf');
+            $expectedUfm = $fontStore . DIRECTORY_SEPARATOR . $fontFileName . '.ufm';
+            if (!file_exists($expectedUfm)) {
+                $font = Font::load($fontFile);
+                $font->parse();
+                $font->saveAdobeFontMetrics($expectedUfm);
+            }
+
+            $nameParts = explode('-', $fontFileName);
+            if (count($nameParts) === 1 || $nameParts[1] === 'Regular') {
+                $nameParts[1] = 'Normal';
+            }
+
+            $family = trim(strtolower(preg_replace('/([A-Z])/', ' $1', $nameParts[0])));
+            $variation = Str::snake($nameParts[1]);
+            if (!isset($fontFamilies[$family])) {
+                $fontFamilies[$family] = [];
+            }
+
+            $fontFamilies[$family][$variation] = $fontStore . DIRECTORY_SEPARATOR . $fontFileName;
+        }
+
+        return $fontFamilies;
+    }
+
     /**
      * @throws PdfExportException
      */

storage/fonts/.gitignore

@@ -1,2 +1,6 @@
+# Font cache files have once been stored directly in this folder
+# therefore its important the contents non-ignored by git
+# are chosen selectively
 *
-!.gitignore
+!.gitignore
+!dompdf/

storage/fonts/dompdf/.gitignore

@@ -0,0 +1,3 @@
+*
+!.gitignore
+!cache/

storage/fonts/dompdf/cache/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore