[FEATURE] Add strict component argument validation

Classes/Exception/InvalidTypeException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace SMS\FluidComponents\Exception;
+
+class InvalidTypeException extends \Exception
+{
+}

Classes/Fluid/ViewHelper/ComponentRenderer.php

@@ -4,6 +4,7 @@
 
 use Psr\Container\ContainerInterface;
 use SMS\FluidComponents\Domain\Model\Slot;
+use SMS\FluidComponents\Exception\InvalidTypeException;
 use SMS\FluidComponents\Interfaces\ComponentAware;
 use SMS\FluidComponents\Interfaces\EscapedParameter;
 use SMS\FluidComponents\Interfaces\RenderingContextAware;
@@ -45,6 +46,13 @@ class ComponentRenderer extends AbstractViewHelper
      */
     protected $componentNamespace;
 
+    /**
+     * Whether strict argument validation is enabled
+     *
+     * @var bool
+     */
+    protected $componentNamespaceIsStrict = false;
+
     /**
      * Cache for component template instance used for rendering
      *
@@ -130,6 +138,12 @@ public function __construct(
     public function setComponentNamespace($componentNamespace)
     {
         $this->componentNamespace = $componentNamespace;
+        foreach ($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['fluid_components']['strict'] ?? [] as $strictNamespace) {
+            if (str_starts_with($componentNamespace, $strictNamespace)) {
+                $this->componentNamespaceIsStrict = true;
+                break;
+            }
+        }
         return $this;
     }
 
@@ -200,8 +214,28 @@ public function render()
         // Provide supplied arguments from component call to renderer
         foreach ($this->arguments as $name => $argument) {
             $argumentType = $this->argumentDefinitions[$name]->getType();
-
-            $argument = $this->componentArgumentConverter->convertValueToType($argument, $argumentType);
+            $argumentIsRequired = $this->argumentDefinitions[$name]->isRequired();
+            $argumentDefaultValue = $this->argumentDefinitions[$name]->getDefaultValue();
+            if (!$argumentIsRequired) {
+                $argument ??= $argumentDefaultValue;
+            }
+            try {
+                $argument = $this->componentArgumentConverter->convertValueToType($argument, $argumentType);
+            } catch (InvalidTypeException $e) {
+                if ($this->componentNamespaceIsStrict && ($argumentIsRequired || $argument !== $this->argumentDefinitions[$name]->getDefaultValue())) {
+                    throw new Exception(
+                        sprintf(
+                            'The argument "%s" defined in "%s" has declared type "%s", but "%s" was given.',
+                            $name,
+                            $this->getComponentNamespace(),
+                            $argumentType,
+                            is_object($argument) ? get_class($argument) : gettype($argument)
+                        ),
+                        1677141778,
+                        $e
+                    );
+                }
+            }
 
             // Provide component namespace to certain data structures
             if ($argument instanceof ComponentAware) {
@@ -428,6 +462,14 @@ protected function initializeComponentParams()
                 foreach ($paramNode->getArguments() as $argumentName => $argumentNode) {
                     $param[$argumentName] = $argumentNode->evaluate($renderingContext);
                 }
+                if ($this->componentNamespaceIsStrict && !$this->componentArgumentConverter->isValidType($param['type'])) {
+                    throw new Exception(sprintf(
+                        'The argument "%s" defined in "%s" has an invalid type declaration "%s".',
+                        $param['name'],
+                        $this->getComponentNamespace(),
+                        $param['type']
+                    ), 1677141778);
+                }
 
                 // Use tag content as default value instead of attribute
                 if (!isset($param['default'])) {

Classes/Utility/ComponentArgumentConverter.php

@@ -2,6 +2,7 @@
 
 namespace SMS\FluidComponents\Utility;
 
+use SMS\FluidComponents\Exception\InvalidTypeException;
 use SMS\FluidComponents\Interfaces\ConstructibleFromArray;
 use SMS\FluidComponents\Interfaces\ConstructibleFromDateTime;
 use SMS\FluidComponents\Interfaces\ConstructibleFromDateTimeImmutable;
@@ -16,6 +17,14 @@
 
 class ComponentArgumentConverter implements \TYPO3\CMS\Core\SingletonInterface
 {
+    private const NATIVE_TYPES = [
+        'integer',
+        'float',
+        'string',
+        'boolean',
+        'array',
+    ];
+
     /**
      * List of interfaces that provide conversion methods between scalar/compound
      * variable types and complex data structures,
@@ -217,6 +226,14 @@ public function convertValueToType($value, string $toType)
 
         // Skip if the type can't be converted
         if (!$this->canTypeBeConvertedToType($givenType, $toType)) {
+            if ($givenType !== $toType && !is_a($value, $toType)) {
+                throw new InvalidTypeException(sprintf(
+                    'The argument value is of type "%s", but "%s" is given.',
+                    $toType,
+                    $givenType
+                ), 1677142681);
+
+            }
             return $value;
         }
 
@@ -234,6 +251,18 @@ public function convertValueToType($value, string $toType)
         return $toType::$constructor($value);
     }
 
+    public function isValidType(string $type): bool
+    {
+        if (in_array($type, self::NATIVE_TYPES, true)) {
+            return true;
+        }
+        $type = $this->resolveTypeAlias($type);
+        if ($this->isCollectionType($type)) {
+            return $this->isValidType($this->extractCollectionItemType($type));
+        }
+        return class_exists($type);
+    }
+
     /**
      * Checks if the provided type describes a collection of values
      *