PDF memory optimizations (#2736)

SECURITY.md

@@ -12,12 +12,13 @@ As announced in the [README](README.md) I only support the latest available rele
 
 ## Reporting a Vulnerability
 
-Please report any security related vulnerability in the [advisories section at GitHub](https://github.com/kevinpapst/kimai2/security/advisories) or via email to info@keleo.de or kpapst@gmx.net.
+Please read the [Bughunter](https://www.kimai.org/documentation/bughunter.html) documentation before posting, 
+and then you can report any security related vulnerability in the [advisories section at GitHub](https://github.com/kevinpapst/kimai2/security/advisories) or via email to kpapst@gmx.net.
 
 I will work as fast as I can to fix the problem and publish a bugfix release / security update. 
 Depending on the size of the required fixes, this might take a couple of hours or a couple of days.
 
-You can expect that your message will be answered ASAP, but please take into account that I am living in the timezone CET. 
+You can expect that your message will be answered ASAP. 
 
 If your issue is valid and after I verified and fixed it, you will be mentioned in the release notes. 
-I am grateful for any (discrete) disclosure of vulnerabilities!
+I am grateful for any (discrete) disclosure of vulnerabilities!

src/Utils/MPdfConverter.php

@@ -74,11 +74,23 @@ class MPdfConverter implements HtmlToPdfConverter
             @ini_set('pcre.backtrack_limit', '1000000');
         }
 
+        // large amount of data take time
+        @ini_set('max_execution_time', '120');
+
         // reduce the size of content parts that are passed to MPDF, to prevent
         // https://mpdf.github.io/troubleshooting/known-issues.html#blank-pages-or-some-sections-missing
         $parts = explode('<pagebreak>', $html);
         for ($i = 0; $i < \count($parts); $i++) {
-            $mpdf->WriteHTML($parts[$i]);
+            if (stripos($parts[$i], '<!-- CONTENT_PART -->') !== false) {
+                $subParts = explode('<!-- CONTENT_PART -->', $parts[$i]);
+                $run = 0;
+                foreach ($subParts as $subPart) {
+                    $mpdf->WriteHTML($subPart);
+                }
+            } else {
+                $mpdf->WriteHTML($parts[$i]);
+            }
+
             if ($i < \count($parts) - 1) {
                 $mpdf->WriteHTML('<pagebreak>');
             }

templates/export/pdf-layout.html.twig

@@ -140,6 +140,7 @@ mpdf-->
         {% set totalInternalRate = 0 %}
         {% set totalRate = 0 %}
         {% for id, summary in summaries %}
+            <!-- CONTENT_PART -->
             {% set totalDuration = totalDuration + summary.duration %}
             {% set totalInternalRate = totalInternalRate + summary.rate_internal %}
             {% set totalRate = totalRate + summary.rate %}
@@ -274,6 +275,7 @@ mpdf-->
         </thead>
         <tbody>
         {% for entry in entries %}
+            <!-- CONTENT_PART -->
             {% set duration = duration + entry.duration %}
             {% if currency is same as(false) %}
                 {% set currency = entry.project.customer.currency %}

templates/invoice/renderer/default-pdf.pdf.twig

@@ -102,6 +102,7 @@ mpdf-->
         </thead>
         <tbody>
         {% for id, entry in model.calculator.entries %}
+            <!-- CONTENT_PART -->
             {% set duration = entry.duration|duration(isDecimal) %}
             {% if entry.fixedRate %}
                 {% set rate = entry.fixedRate %}

templates/invoice/renderer/freelancer.pdf.twig

@@ -109,6 +109,7 @@ mpdf-->
         </thead>
         <tbody>
         {% for entry in model.calculator.entries %}
+            <!-- CONTENT_PART -->
             {% set duration = entry.duration|duration(isDecimal) %}
             {% if entry.fixedRate is not null %}
                 {% set rate = entry.fixedRate %}