Image upload rejected for uppercase file extensions (.JPG/.JPEG) — strict case-sensitive extension check #502

Describe the bug

Uploading a valid JPEG image whose filename has an UPPERCASE extension (e.g. IMG_1234.JPG, PHOTO.JPEG — common for camera/iPhone exports) is rejected with:

The image field must have one of the following extensions: jpg, jpeg, png, gif, bmp, svg, webp.

The file is a genuine JPEG; only the extension case differs. Renaming the extension to lowercase (.jpg) makes the same file upload successfully.

Root cause

packages/Webkul/Core/src/Rules/FileOrImageValidValue.php (~line 95-97):

$extension = $value instanceof UploadedFile
    ? $value->getClientOriginalExtension()   // preserves original case, e.g. "JPG"
    : $value->getExtension();

if ($this->allowedExtensions && ! in_array($extension, $this->allowedExtensions, true)) {
    $fail('validation.extensions')->translate(['values' => implode(', ', $this->allowedExtensions)]);

    return false;
}

IMAGE_ALLOWED_EXTENSIONS is lowercase (['jpg','jpeg','png','gif','bmp','svg','webp']) and the check uses in_array(..., true) (strict, case-sensitive). So "JPG" !== "jpg" → valid images are rejected based purely on extension letter case.

Steps to reproduce

1. Take any valid .jpg image and rename its extension to uppercase .JPG.
2. Upload it to a product Image attribute.
3. Validation fails with the extensions error above.
4. Rename back to lowercase .jpg → uploads fine.

Expected behavior

Extension comparison should be case-insensitive. A .JPG/.JPEG file should be accepted exactly like .jpg/.jpeg.

Proposed fix

Lowercase the extension before comparison:

$extension = strtolower(
    $value instanceof UploadedFile ? $value->getClientOriginalExtension() : $value->getExtension()
);

Environment

• UnoPIM: v2.1.4
• PHP: 8.4
• OS: macOS (local install via php artisan serve)