Remove PDF invoice after generation

Author: rogyar

app/code/Magento/Sales/Controller/Adminhtml/Invoice/AbstractInvoice/PrintAction.php

@@ -58,9 +58,11 @@ public function execute()
                 $date = $this->_objectManager->get(
                     \Magento\Framework\Stdlib\DateTime\DateTime::class
                 )->date('Y-m-d_H-i-s');
+                $fileContent = ['type' => 'string', 'value' => $pdf->render(), 'rm' => true];
+
                 return $this->_fileFactory->create(
                     'invoice' . $date . '.pdf',
-                    $pdf->render(),
+                    $fileContent,
                     DirectoryList::VAR_DIR,
                     'application/pdf'
                 );

lib/internal/Magento/Framework/App/Response/Http/FileFactory.php

@@ -76,7 +76,11 @@ public function create(
             ->setHeader('Pragma', 'public', true)
             ->setHeader('Cache-Control', 'must-revalidate, post-check=0, pre-check=0', true)
             ->setHeader('Content-type', $contentType, true)
-            ->setHeader('Content-Length', $contentLength === null ? strlen($content) : $contentLength, true)
+            ->setHeader(
+                'Content-Length',
+                $contentLength === null ? strlen($this->getFileContent($content)) : $contentLength,
+                true
+            )
             ->setHeader('Content-Disposition', 'attachment; filename="' . $fileName . '"', true)
             ->setHeader('Last-Modified', date('r'), true);
 
@@ -88,7 +92,8 @@ public function create(
                     echo $stream->read(1024);
                 }
             } else {
-                $dir->writeFile($fileName, $content);
+                $dir->writeFile($fileName, $this->getFileContent($content));
+                $file = $fileName;
                 $stream = $dir->openFile($fileName, 'r');
                 while (!$stream->eof()) {
                     echo $stream->read(1024);
@@ -102,4 +107,19 @@ public function create(
         }
         return $this->_response;
     }
+
+    /**
+     * Returns file content for writing.
+     *
+     * @param string|array $content
+     * @return string
+     */
+    private function getFileContent($content)
+    {
+        if (isset($content['type']) && $content['type'] == 'string') {
+            return $content['value'];
+        }
+
+        return $content;
+    }
 }