diff --git a/config/packages/fos_ckeditor.yaml b/config/packages/fos_ckeditor.yaml
index a88e43a8..1d114656 100644
--- a/config/packages/fos_ckeditor.yaml
+++ b/config/packages/fos_ckeditor.yaml
@@ -21,7 +21,7 @@ fos_ck_editor:
             height: 100
             enterMode: 2
             toolbar: label_toolbar
-            extraPlugins: "partdb_label"
+            extraPlugins: ["partdb_label", "showprotected"]
             font_names: >
                 DejaVu Sans Mono/DejaVu Sans Mono;
                 DejaVu Sans/DejaVu Sans;
@@ -43,6 +43,9 @@ fos_ck_editor:
         partdb_label:
             path:      "ckeditor/plugins/partdb_label/"
             filename: "plugin.js"
+        showprotected:
+            path:      "ckeditor/plugins/showprotected/"
+            filename: "plugin.js"
 
 
     toolbars:
diff --git a/public/ckeditor/plugins/partdb_label/plugin.js b/public/ckeditor/plugins/partdb_label/plugin.js
index e04befb1..a784254a 100644
--- a/public/ckeditor/plugins/partdb_label/plugin.js
+++ b/public/ckeditor/plugins/partdb_label/plugin.js
@@ -83,6 +83,10 @@ function findLabelForPlaceholder(search)
     }
 }
 
+//Dont escape text inside of twig blocks
+CKEDITOR.config.protectedSource.push(/\{\{[\s\S]*?\}\}/g);
+CKEDITOR.config.protectedSource.push(/\{\%[\s\S]*?%\}/g);
+
 CKEDITOR.plugins.add('partdb_label', {
     hidpi: true,
     icons: 'placeholder',
diff --git a/public/ckeditor/plugins/showprotected/dialogs/protected.js b/public/ckeditor/plugins/showprotected/dialogs/protected.js
new file mode 100644
index 00000000..9c7ede3d
--- /dev/null
+++ b/public/ckeditor/plugins/showprotected/dialogs/protected.js
@@ -0,0 +1,52 @@
+
+CKEDITOR.dialog.add( 'showProtectedDialog', function( editor ) {
+
+	return {
+		title: 'Edit Protected Source',
+		minWidth: 300,
+		minHeight: 60,
+		onOk: function() {
+			var newSourceValue = this.getContentElement( 'info', 'txtProtectedSource' ).getValue();
+			
+			var encodedSourceValue = CKEDITOR.plugins.showprotected.encodeProtectedSource( newSourceValue );
+			
+			this._.selectedElement.setAttribute('data-cke-realelement', encodedSourceValue);
+			this._.selectedElement.setAttribute('title', newSourceValue);
+			this._.selectedElement.setAttribute('alt', newSourceValue);
+		},
+
+		onHide: function() {
+			delete this._.selectedElement;
+		},
+
+		onShow: function() {
+			this._.selectedElement = editor.getSelection().getSelectedElement();
+			
+			var decodedSourceValue = CKEDITOR.plugins.showprotected.decodeProtectedSource( this._.selectedElement.getAttribute('data-cke-realelement') );
+
+			this.setValueOf( 'info', 'txtProtectedSource', decodedSourceValue );
+		},
+		contents: [
+			{
+			id: 'info',
+			label: 'Edit Protected Source',
+			accessKey: 'I',
+			elements: [
+				{
+				type: 'text',
+				id: 'txtProtectedSource',
+				label: 'Value',
+				required: true,
+				validate: function() {
+					if ( !this.getValue() ) {
+						alert( 'The value cannot be empty' );
+						return false;
+					}
+					return true;
+				}
+			}
+			]
+		}
+		]
+	};
+} );
\ No newline at end of file
diff --git a/public/ckeditor/plugins/showprotected/images/code.gif b/public/ckeditor/plugins/showprotected/images/code.gif
new file mode 100644
index 00000000..912517b8
Binary files /dev/null and b/public/ckeditor/plugins/showprotected/images/code.gif differ
diff --git a/public/ckeditor/plugins/showprotected/plugin.js b/public/ckeditor/plugins/showprotected/plugin.js
new file mode 100644
index 00000000..a3e88132
--- /dev/null
+++ b/public/ckeditor/plugins/showprotected/plugin.js
@@ -0,0 +1,105 @@
+/*
+ *  "showprotected" CKEditor plugin
+ *  
+ *  Created by Matthew Lieder (https://github.com/IGx89)
+ *  
+ *  Licensed under the MIT, GPL, LGPL and MPL licenses
+ *  
+ *  Icon courtesy of famfamfam: http://www.famfamfam.com/lab/icons/mini/
+ */
+
+// TODO: configuration settings
+// TODO: show the actual text inline, not just an icon?
+// TODO: improve copy/paste behavior (tooltip is wrong after paste)
+
+CKEDITOR.plugins.add( 'showprotected', {
+	requires: 'dialog,fakeobjects',
+	onLoad: function() {
+		// Add the CSS styles for protected source placeholders.
+		var iconPath = CKEDITOR.getUrl( this.path + 'images' + '/code.gif' ),
+			baseStyle = 'background:url(' + iconPath + ') no-repeat %1 center;border:1px dotted #00f;background-size:16px;';
+
+		var template = '.%2 img.cke_protected' +
+			'{' +
+				baseStyle +
+				'width:16px;' +
+				'min-height:15px;' +
+				// The default line-height on IE.
+				'height:1.15em;' +
+				// Opera works better with "middle" (even if not perfect)
+				'vertical-align:' + ( CKEDITOR.env.opera ? 'middle' : 'text-bottom' ) + ';' +
+			'}';
+
+		// Styles with contents direction awareness.
+		function cssWithDir( dir ) {
+			return template.replace( /%1/g, dir == 'rtl' ? 'right' : 'left' ).replace( /%2/g, 'cke_contents_' + dir );
+		}
+
+		CKEDITOR.addCss( cssWithDir( 'ltr' ) + cssWithDir( 'rtl' ) );
+	},
+
+	init: function( editor ) {
+		CKEDITOR.dialog.add( 'showProtectedDialog', this.path + 'dialogs/protected.js' );
+		
+		editor.on( 'doubleclick', function( evt ) {
+			var element = evt.data.element;
+
+			if ( element.is( 'img' ) && element.hasClass( 'cke_protected' ) ) {
+				evt.data.dialog = 'showProtectedDialog';
+			}
+		} );
+	},
+
+	afterInit: function( editor ) {
+		// Register a filter to displaying placeholders after mode change.
+
+		var dataProcessor = editor.dataProcessor,
+			dataFilter = dataProcessor && dataProcessor.dataFilter;
+
+		if ( dataFilter ) {
+			dataFilter.addRules( {
+				comment: function( commentText, commentElement ) {
+					if(commentText.indexOf(CKEDITOR.plugins.showprotected.protectedSourceMarker) == 0) {
+						commentElement.attributes = [];
+						var fakeElement = editor.createFakeParserElement( commentElement, 'cke_protected', 'protected' );
+						
+						var cleanedCommentText = CKEDITOR.plugins.showprotected.decodeProtectedSource( commentText );
+						fakeElement.attributes.title = fakeElement.attributes.alt = cleanedCommentText;
+						
+						return fakeElement;
+					}
+					
+					return null;
+				}
+			} );
+		}
+	}
+} );
+
+/**
+ * Set of showprotected plugin's helpers.
+ *
+ * @class
+ * @singleton
+ */
+CKEDITOR.plugins.showprotected = {
+		
+	protectedSourceMarker: '{cke_protected}',
+		
+	decodeProtectedSource: function( protectedSource ) {
+		if(protectedSource.indexOf('%3C!--') == 0) {
+			return decodeURIComponent(protectedSource).replace( /<!--\{cke_protected\}([\s\S]+?)-->/g, function( match, data ) {
+                return decodeURIComponent( data );
+			} );
+		} else {
+			return decodeURIComponent(protectedSource.substr(CKEDITOR.plugins.showprotected.protectedSourceMarker.length));
+		}
+	},
+	
+	encodeProtectedSource: function( protectedSource ) {
+		return '<!--' + CKEDITOR.plugins.showprotected.protectedSourceMarker +
+        	encodeURIComponent( protectedSource ).replace( /--/g, '%2D%2D' ) +
+        	'-->';
+	}
+	
+};
\ No newline at end of file
diff --git a/src/Controller/LabelController.php b/src/Controller/LabelController.php
index ae62408a..3d2444d6 100644
--- a/src/Controller/LabelController.php
+++ b/src/Controller/LabelController.php
@@ -26,6 +26,7 @@ use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\LabelSystem\LabelOptions;
 use App\Entity\LabelSystem\LabelProfile;
 use App\Entity\Parts\Part;
+use App\Exceptions\TwigModeException;
 use App\Form\LabelOptionsType;
 use App\Form\LabelSystem\LabelDialogType;
 use App\Helpers\LabelResponse;
@@ -35,6 +36,7 @@ use App\Services\LabelSystem\LabelGenerator;
 use App\Services\Misc\RangeParser;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\SubmitButton;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\Request;
@@ -53,7 +55,8 @@ class LabelController extends AbstractController
     protected $elementTypeNameGenerator;
     protected $rangeParser;
 
-    public function __construct(LabelGenerator $labelGenerator, EntityManagerInterface $em, ElementTypeNameGenerator $elementTypeNameGenerator, RangeParser $rangeParser)
+    public function __construct(LabelGenerator $labelGenerator, EntityManagerInterface $em, ElementTypeNameGenerator $elementTypeNameGenerator,
+        RangeParser $rangeParser)
     {
         $this->labelGenerator = $labelGenerator;
         $this->em = $em;
@@ -109,8 +112,13 @@ class LabelController extends AbstractController
             $target_id = (string) $form->get('target_id')->getData();
             $targets = $this->findObjects($form_options->getSupportedElement(), $target_id);
             if (!empty($targets)) {
-                $pdf_data = $this->labelGenerator->generateLabel($form_options, $targets);
-                $filename = $this->getLabelName($targets[0], $profile);
+                try {
+                    $pdf_data = $this->labelGenerator->generateLabel($form_options, $targets);
+                    $filename = $this->getLabelName($targets[0], $profile);
+                } catch (TwigModeException $exception) {
+                    $form->get('options')->get('lines')->addError(new FormError($exception->getMessage()));
+                }
+
             } else {
                 $this->addFlash('warning', 'label_generator.no_entities_found');
             }
diff --git a/src/Exceptions/TwigModeException.php b/src/Exceptions/TwigModeException.php
new file mode 100644
index 00000000..67e54059
--- /dev/null
+++ b/src/Exceptions/TwigModeException.php
@@ -0,0 +1,33 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Exceptions;
+
+
+use Throwable;
+use Twig\Error\Error;
+
+class TwigModeException extends \RuntimeException
+{
+    public function __construct(Error $previous = null)
+    {
+        parent::__construct($previous->getMessage(), 0, $previous);
+    }
+}
\ No newline at end of file
diff --git a/src/Form/LabelOptionsType.php b/src/Form/LabelOptionsType.php
index 7b34eed0..408bfaee 100644
--- a/src/Form/LabelOptionsType.php
+++ b/src/Form/LabelOptionsType.php
@@ -105,6 +105,23 @@ class LabelOptionsType extends AbstractType
             ],
             'required' => false,
         ]);
+
+        $builder->add('lines_mode', ChoiceType::class, [
+            'label' => 'label_options.lines_mode.label',
+            'choices' => [
+                'label_options.lines_mode.html' => 'html',
+                'label.options.lines_mode.twig' => 'twig',
+            ],
+            'help' => 'label_options.lines_mode.help',
+            'help_html' => true,
+            'expanded' => true,
+            'attr' => [
+                'class' => 'pt-2'
+            ],
+            'label_attr' => [
+                'class' => 'radio-custom radio-inline'
+            ]
+        ]);
     }
 
     public function configureOptions(OptionsResolver $resolver)
diff --git a/src/Services/LabelSystem/LabelHTMLGenerator.php b/src/Services/LabelSystem/LabelHTMLGenerator.php
index ed9aef94..9e89367b 100644
--- a/src/Services/LabelSystem/LabelHTMLGenerator.php
+++ b/src/Services/LabelSystem/LabelHTMLGenerator.php
@@ -22,24 +22,34 @@ namespace App\Services\LabelSystem;
 
 use App\Entity\Contracts\NamedElementInterface;
 use App\Entity\LabelSystem\LabelOptions;
+use App\Exceptions\TwigModeException;
 use App\Services\ElementTypeNameGenerator;
 use App\Services\LabelSystem\Barcodes\BarcodeContentGenerator;
+use Symfony\Component\Security\Core\Security;
 use Twig\Environment;
+use Twig\Error\Error;
+use Twig\Error\SyntaxError;
 
-class LabelHTMLGenerator
+final class LabelHTMLGenerator
 {
     protected $twig;
     protected $elementTypeNameGenerator;
     protected $replacer;
     protected $barcodeGenerator;
+    protected $sandboxedTwigProvider;
+    protected $partdb_title;
+    protected $security;
 
     public function __construct(ElementTypeNameGenerator $elementTypeNameGenerator, LabelTextReplacer $replacer, Environment $twig,
-        BarcodeGenerator $barcodeGenerator)
+        BarcodeGenerator $barcodeGenerator, SandboxedTwigProvider $sandboxedTwigProvider, Security $security, string $partdb_title)
     {
         $this->twig = $twig;
         $this->elementTypeNameGenerator = $elementTypeNameGenerator;
         $this->replacer = $replacer;
         $this->barcodeGenerator = $barcodeGenerator;
+        $this->sandboxedTwigProvider = $sandboxedTwigProvider;
+        $this->security = $security;
+        $this->partdb_title = $partdb_title;
     }
 
     public function getLabelHTML(LabelOptions $options, array $elements): string
@@ -49,15 +59,43 @@ class LabelHTMLGenerator
         }
 
         $twig_elements = [];
+
+        if ($options->getLinesMode() === 'twig') {
+            $sandboxed_twig = $this->sandboxedTwigProvider->getTwig($options);
+            $current_user = $this->security->getUser();
+        }
+
+        $page = 1;
         foreach ($elements as $element) {
+            if ($options->getLinesMode() === 'twig' && $sandboxed_twig !== null) {
+                try {
+                    $lines = $sandboxed_twig->render(
+                        'lines',
+                        [
+                            'element' => $element,
+                            'page' => $page,
+                            'user' => $current_user,
+                            'install_title' => $this->partdb_title,
+                        ]
+                    );
+                } catch (Error $exception) {
+                    throw new TwigModeException($exception);
+                }
+            } else {
+                $lines = $this->replacer->replace($options->getLines(), $element);
+            }
+
             $twig_elements[] = [
                 'element' => $element,
-                'lines' => $this->replacer->replace($options->getLines(), $element),
+                'lines' => $lines,
                 'barcode' => $this->barcodeGenerator->generateSVG($options, $element),
                 'barcode_content' => $this->barcodeGenerator->getContent($options, $element),
             ];
+
+            $page++;
         }
 
+
         return $this->twig->render('LabelSystem/labels/base_label.html.twig', [
             'meta_title' => $this->getPDFTitle($options, $elements[0]),
             'elements' => $twig_elements,
@@ -65,6 +103,7 @@ class LabelHTMLGenerator
         ]);
     }
 
+
     protected function getPDFTitle(LabelOptions $options, object $element)
     {
         if ($element instanceof NamedElementInterface) {
diff --git a/src/Services/LabelSystem/SandboxedTwigProvider.php b/src/Services/LabelSystem/SandboxedTwigProvider.php
new file mode 100644
index 00000000..86103ca9
--- /dev/null
+++ b/src/Services/LabelSystem/SandboxedTwigProvider.php
@@ -0,0 +1,140 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\LabelSystem;
+
+
+use App\Entity\Attachments\Attachment;
+use App\Entity\Attachments\AttachmentContainingDBElement;
+use App\Entity\Base\AbstractCompany;
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\Base\AbstractNamedDBElement;
+use App\Entity\Base\AbstractStructuralDBElement;
+use App\Entity\Contracts\NamedElementInterface;
+use App\Entity\Contracts\TimeStampableInterface;
+use App\Entity\LabelSystem\LabelOptions;
+use App\Entity\Parameters\AbstractParameter;
+use App\Entity\Parts\MeasurementUnit;
+use App\Entity\Parts\Part;
+use App\Entity\Parts\PartLot;
+use App\Entity\Parts\Storelocation;
+use App\Entity\Parts\Supplier;
+use App\Entity\PriceInformations\Currency;
+use App\Entity\PriceInformations\Orderdetail;
+use App\Entity\PriceInformations\Pricedetail;
+use App\Entity\UserSystem\User;
+use App\Twig\AppExtension;
+use App\Twig\Sandbox\InheritanceSecurityPolicy;
+use Twig\Environment;
+use Twig\Extension\SandboxExtension;
+use Twig\Extra\Intl\IntlExtension;
+use Twig\Sandbox\SecurityPolicy;
+use Twig\Sandbox\SecurityPolicyInterface;
+
+class SandboxedTwigProvider
+{
+    protected const ALLOWED_TAGS = ['apply', 'autoescape', 'do', 'for', 'if', 'set', 'verbatim', 'with'];
+    protected const ALLOWED_FILTERS = ['abs', 'batch', 'capitalize', 'column', 'country_name',
+        'currency_name', 'currency_symbol', 'date', 'date_modify', 'default', 'escape', 'filter', 'first', 'format',
+        'format_currency', 'format_date', 'format_datetime', 'format_number', 'format_time', 'join', 'keys',
+        'language_name', 'last', 'length', 'locale_name', 'lower', 'map', 'merge', 'nl2br', 'raw', 'number_format',
+        'reduce', 'replace', 'reverse', 'slice', 'sort', 'spaceless', 'split', 'striptags', 'timezone_name', 'title',
+        'trim', 'upper', 'url_encode',
+        //Part-DB specific filters:
+        'moneyFormat', 'siFormat', 'amountFormat'];
+
+    protected const ALLOWED_FUNCTIONS = ['date', 'html_classes', 'max', 'min', 'random', 'range'];
+
+    protected const ALLOWED_METHODS = [
+        NamedElementInterface::class => ['getName'],
+        AbstractDBElement::class => ['getID', '__toString'],
+        TimeStampableInterface::class => ['getLastModified', 'getAddedDate'],
+        AbstractStructuralDBElement::class => ['isChildOf', 'isRoot', 'getParent', 'getComment', 'getLevel',
+            'getFullPath', 'getPathArray', 'getChildren', 'isNotSelectable'],
+        AbstractCompany::class => ['getAddress', 'getPhoneNumber', 'getFaxNumber', 'getEmailAddress', 'getWebsite'],
+        AttachmentContainingDBElement::class => ['getAttachments', 'getMasterPictureAttachment'],
+        Attachment::class => ['isPicture', 'is3DModel', 'isExternal', 'isSecure', 'isBuiltIn', 'getExtension',
+            'getElement', 'getURL', 'getFilename', 'getAttachmentType', 'getShowInTable'],
+        AbstractParameter::class => ['getFormattedValue', 'getGroup', 'getSymbol', 'getValueMin', 'getValueMax',
+            'getValueTypical', 'getUnit', 'getValueText'],
+        MeasurementUnit::class => ['getUnit', 'isInteger', 'useSIPrefix'],
+        PartLot::class => ['isExpired', 'getDescription', 'getComment', 'getExpirationDate', 'getStorageLocation',
+            'getPart', 'isInstockUnknown', 'getAmount', 'getNeedsRefill'],
+        Storelocation::class => ['isFull', 'isOnlySinglePart', 'isLimitToExistingParts', 'getStorageType'],
+        Supplier::class => ['getShippingCosts', 'getDefaultCurrency'],
+        Part::class => ['isNeedsReview', 'getTags', 'getMass', 'getDescription', 'isFavorite', 'getCategory',
+            'getFootprint', 'getPartLots', 'getPartUnit', 'useFloatAmount', 'getMinAmount', 'getAmountSum',
+            'getManufacturerProductUrl', 'getCustomProductURL', 'getManufacturingStatus', 'getManufacturer',
+            'getManufacturerProductNumber', 'getOrderdetails', 'isObsolete'],
+        Currency::class => ['getIsoCode', 'getInverseExchangeRate', 'getExchangeRate'],
+        Orderdetail::class => ['getPart', 'getSupplier', 'getSupplierPartNr', 'getObsolete',
+            'getPricedetails', 'findPriceForQty', ],
+        Pricedetail::class => ['getOrderdetail', 'getPrice', 'getPricePerUnit', 'getPriceRelatedQuantity',
+            'getMinDiscountQuantity', 'getCurrency'],
+        //Only allow very little information about users...
+        User::class => ['isAnonymousUser', 'getUsername', 'getFullName', 'getFirstName', 'getLastName',
+            'getDepartment', 'getEmail']
+
+    ];
+    protected const ALLOWED_PROPERTIES = [];
+
+    private $appExtension;
+
+    public function __construct(AppExtension $appExtension)
+    {
+        $this->appExtension = $appExtension;
+    }
+
+    public function getTwig(LabelOptions $options): Environment
+    {
+        if ($options->getLinesMode() !== 'twig') {
+            throw new \InvalidArgumentException('The LabelOptions must explicitly allow twig via lines_mode = "twig"!');
+        }
+
+
+        $loader = new \Twig\Loader\ArrayLoader([
+                                                   'lines' => $options->getLines(),
+                                               ]);
+        $twig = new Environment($loader);
+
+        //Second argument activate sandbox globally.
+        $sandbox = new SandboxExtension($this->getSecurityPolicy(), true);
+        $twig->addExtension($sandbox);
+
+        //Add IntlExtension
+        $twig->addExtension(new IntlExtension());
+
+        //Add Part-DB specific extension
+        $twig->addExtension($this->appExtension);
+
+        return $twig;
+    }
+
+    protected function getSecurityPolicy(): SecurityPolicyInterface
+    {
+        return new InheritanceSecurityPolicy(
+            self::ALLOWED_TAGS,
+            self::ALLOWED_FILTERS,
+            self::ALLOWED_METHODS,
+            self::ALLOWED_PROPERTIES,
+            self::ALLOWED_FUNCTIONS
+        );
+    }
+}
\ No newline at end of file
diff --git a/src/Twig/Sandbox/InheritanceSecurityPolicy.php b/src/Twig/Sandbox/InheritanceSecurityPolicy.php
new file mode 100644
index 00000000..3f0a32d8
--- /dev/null
+++ b/src/Twig/Sandbox/InheritanceSecurityPolicy.php
@@ -0,0 +1,140 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Twig\Sandbox;
+
+use Twig\Markup;
+use Twig\Sandbox\SecurityNotAllowedFilterError;
+use Twig\Sandbox\SecurityNotAllowedFunctionError;
+use Twig\Sandbox\SecurityNotAllowedMethodError;
+use Twig\Sandbox\SecurityNotAllowedPropertyError;
+use Twig\Sandbox\SecurityNotAllowedTagError;
+use Twig\Sandbox\SecurityPolicyInterface;
+use Twig\Template;
+
+/**
+ * Represents a security policy which need to be enforced when sandbox mode is enabled.
+ *
+ * Modified by Jan Böhmer, to allow inheritance of methods and properties via class hierachy.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+final class InheritanceSecurityPolicy implements SecurityPolicyInterface
+{
+    private $allowedTags;
+    private $allowedFilters;
+    private $allowedMethods;
+    private $allowedProperties;
+    private $allowedFunctions;
+
+    public function __construct(array $allowedTags = [], array $allowedFilters = [], array $allowedMethods = [], array $allowedProperties = [], array $allowedFunctions = [])
+    {
+        $this->allowedTags = $allowedTags;
+        $this->allowedFilters = $allowedFilters;
+        $this->setAllowedMethods($allowedMethods);
+        $this->allowedProperties = $allowedProperties;
+        $this->allowedFunctions = $allowedFunctions;
+    }
+
+    public function setAllowedTags(array $tags): void
+    {
+        $this->allowedTags = $tags;
+    }
+
+    public function setAllowedFilters(array $filters): void
+    {
+        $this->allowedFilters = $filters;
+    }
+
+    public function setAllowedMethods(array $methods): void
+    {
+        $this->allowedMethods = [];
+        foreach ($methods as $class => $m) {
+            $this->allowedMethods[$class] = array_map(function ($value) { return strtr($value, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'); }, \is_array($m) ? $m : [$m]);
+        }
+    }
+
+    public function setAllowedProperties(array $properties): void
+    {
+        $this->allowedProperties = $properties;
+    }
+
+    public function setAllowedFunctions(array $functions): void
+    {
+        $this->allowedFunctions = $functions;
+    }
+
+    public function checkSecurity($tags, $filters, $functions): void
+    {
+        foreach ($tags as $tag) {
+            if (!\in_array($tag, $this->allowedTags)) {
+                throw new SecurityNotAllowedTagError(sprintf('Tag "%s" is not allowed.', $tag), $tag);
+            }
+        }
+
+        foreach ($filters as $filter) {
+            if (!\in_array($filter, $this->allowedFilters)) {
+                throw new SecurityNotAllowedFilterError(sprintf('Filter "%s" is not allowed.', $filter), $filter);
+            }
+        }
+
+        foreach ($functions as $function) {
+            if (!\in_array($function, $this->allowedFunctions)) {
+                throw new SecurityNotAllowedFunctionError(sprintf('Function "%s" is not allowed.', $function), $function);
+            }
+        }
+    }
+
+    public function checkMethodAllowed($obj, $method): void
+    {
+        if ($obj instanceof Template || $obj instanceof Markup) {
+            return;
+        }
+
+        $allowed = false;
+        $method = strtr($method, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz');
+        foreach ($this->allowedMethods as $class => $methods) {
+            if ($obj instanceof $class) {
+                $allowed = \in_array($method, $methods);
+
+                //CHANGED: Only break if we the method is allowed, otherwise try it on the other methods
+                if ($allowed) {
+                    break;
+                }
+            }
+        }
+
+        if (!$allowed) {
+            $class = \get_class($obj);
+            throw new SecurityNotAllowedMethodError(sprintf('Calling "%s" method on a "%s" object is not allowed.', $method, $class), $class, $method);
+        }
+    }
+
+    public function checkPropertyAllowed($obj, $property): void
+    {
+        $allowed = false;
+        foreach ($this->allowedProperties as $class => $properties) {
+            if ($obj instanceof $class) {
+                $allowed = \in_array($property, \is_array($properties) ? $properties : [$properties]);
+
+                //CHANGED: Only break if we the method is allowed, otherwise try it on the other methods
+                if ($allowed) {
+                    break;
+                }
+            }
+        }
+
+        if (!$allowed) {
+            $class = \get_class($obj);
+            throw new SecurityNotAllowedPropertyError(sprintf('Calling "%s" property on a "%s" object is not allowed.', $property, $class), $class, $property);
+        }
+    }
+}