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Laravel validation base64 image | How-to Guide

Laravel developers have to make sure that the uploaded images meet specific size requirements is a common task. However, Laravel’s default validation rules, do not cover base64-encoded images.

Today, we are going to take a look at how to create a custom validation rule to validate base64-encoded images in Laravel.

1. First, we have to run this command to create our custom validation rule named Base64Image:

   php artisan make:rule Base64Image

   This will generate a new validation rule class in the App/Rules directory.
2. Then, open the generated Base64Image class and then define the validation logic in the passes method. This will check if the input data is a valid base64-encoded image.

   For example, the Base64Image class will look like:

   <?php
namespace App\Rules;
use Illuminate\Contracts\Validation\Rule;
use Illuminate\Support\Facades\File;
class Base64Image implements Rule
{
public function passes($attribute, $value)
{
if (empty($value)) {
return false;
}
// Check if the data is a valid base64 string
if (base64_decode($value, true) === false) {
return false;
}
// Decode the base64 string to binary data
$binaryData = base64_decode($value);
// Check if the binary data is a valid image
$tmpFile = tempnam(sys_get_temp_dir(), 'base64image');
File::put($tmpFile, $binaryData);
if (getimagesize($tmpFile) === false) {
return false;
}
unlink($tmpFile); // Clean up the temporary file
return true;
}
public function message()
{
return 'The :attribute must be a valid base64-encoded image.';
}
}


   Here, we are checking if the input data is a valid base64 string. If yes, then it is decoded and then validated if it’s a valid image.
3. Now, it is time to integrate our custom validation rule into our validation logic in Laravel controllers.

   For example:

   $validatedData = $request->validate([
'image' => ['required', new Base64Image],
]);


With the above steps, we can validate that the input data is a valid base64-encoded image. This helps Laravel handle the validation errors.

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Conclusion

In brief, our Support Experts demonstrated how to validate base64 images in Laravel.