TYPO3 10.4.6 – Validator for Image Upload Dimensions and Aspect Ratio: A Comprehensive Guide

TYPO3 10.4.6 Image Upload Validation: The Basics

In TYPO3 10.4.6, image upload validation is handled by the TYPO3\CMS\Core\Resource\Storage class. By default, TYPO3 provides several built-in validators, including TYPO3\CMS\Core\Resource\Validation\FileValidator and TYPO3\CMS\Core\Resource\Validation\ImageValidator. However, these validators do not provide the level of customization we need for our specific use case.

Creating a Custom Validator

To create a custom validator, we’ll create a new class that extends the TYPO3\CMS\Core\Resource\Validation\AbstractValidator class.

<?php
namespace MyApp\Validator;

use TYPO3\CMS\Core\Resource\Validation\AbstractValidator;
use TYPO3\CMS\Core\Resource\FileInterface;

class ImageDimensionValidator extends AbstractValidator
{
    protected $allowedDimensions = [
        'width' => 800,
        'height' => 600,
    ];

    protected $allowedAspectRatios = [
        'min' => 1.2,
        'max' => 1.8,
    ];

    public function validate(FileInterface $file): bool
    {
        $imageInfo = getimagesize($file->getForResourceProperties('file'));
        $width = $imageInfo[0];
        $height = $imageInfo[1];

        if ($width < $this->allowedDimensions['width'] || $height < $this->allowedDimensions['height']) {
            return false;
        }

        $aspectRatio = $width / $height;

        if ($aspectRatio < $this->allowedAspectRatios['min'] || $aspectRatio > $this->allowedAspectRatios['max']) {
            return false;
        }

        return true;
    }
}
?>

In this example, we’ve defined a custom validator class ImageDimensionValidator with two properties: $allowedDimensions and $allowedAspectRatios. The validate() method checks the uploaded image’s dimensions and aspect ratio against these defined values.

Registering the Custom Validator

Once we’ve created our custom validator, we need to register it in TYPO3’s validation framework.

<?php
use MyApp\Validator\ImageDimensionValidator;

$validators = [
    ImageDimensionValidator::class,
];

$container = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Object\Container\Container::class);
$validatorRegistry = $container->get(\TYPO3\CMS\Core\Resource\Validation\ValidatorRegistry::class);

foreach ($validators as $validator) {
    $validatorRegistry->addValidator($validator);
}
?>

In this example, we’ve registered our custom validator by adding it to the ValidatorRegistry instance.

Configuring the Validator in TYPO3

To use our custom validator in TYPO3, we need to configure it in the TYPO3_CONF_VARS array.

<?php
$GLOBALS['TYPO3_CONF_VARS']['SYS']['formEngine']['validation']['imageDimensions'] = [
    'validators' => [
        ImageDimensionValidator::class,
    ],
];
?>

In this example, we’ve added our custom validator to the imageDimensions validator configuration.

Testing the Custom Validator

Now that we’ve configured our custom validator, let’s test it by uploading an image with incorrect dimensions.

Upload an image with dimensions smaller than 800x600 or with an aspect ratio outside the range of 1.2 to 1.8. You should see an error message indicating that the image does not meet the required dimensions and aspect ratio.

Conclusion

In this article, we’ve demonstrated how to create a custom validator for image upload dimensions and aspect ratio in TYPO3 10.4.6. By following these steps, you can ensure that all uploaded images conform to specific dimensions and aspect ratios, maintaining a consistent visual appeal and optimal performance across your website.

Remember to adjust the $allowedDimensions and $allowedAspectRatios properties in your custom validator class to fit your specific use case.

FAQs

1. Can I use this custom validator for other file types?

   A: Yes, you can modify the custom validator to support other file types by adjusting the validate() method and the properties.

2. How do I handle errors and exceptions in the custom validator?

   A: You can throw custom exceptions or return error messages in the validate() method to handle errors and exceptions.

3. Can I use this custom validator in other TYPO3 versions?

   A: This article is specifically written for TYPO3 10.4.6, but the principles can be applied to other versions with minimal modifications.

We hope this comprehensive guide has helped you create a custom validator for image upload dimensions and aspect ratio in TYPO3 10.4.6. Happy coding!

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