Pull Request resolves #47515

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

This pull request implements error handling for punycode conversions of URLs by catching exceptions to prevent crash.

In UrlFilter.php, a try...catch block has been added around PunycodeHelper::urlToPunycode() to silently handle conversion exceptions
In UrlRule.php, the host validation logic has been updated to split the hostname into individual labels and test the punycode conversion for each using PunycodeHelper::toPunycode(). Any exception thrown during this process is caught, properly resulting in a validation failure, instead of a unhandled application crash.

Minor code style formatting for the $scheme array in UrlRule.php

Testing Instructions

Try saving a url type form field <input type="url" inputmode="url"> (ex: the "Website" field in the Edit Contact form).
Enter a URL with an invalid hostname character (like an apostrophe), for example:
https://example'test.com

Actual result BEFORE applying this Pull Request

Fatal error / application crash ( ex: 101 Prohibited input U+00000027)

Expected result AFTER applying this Pull Request

No crash. Appropriate error message is shown ( Invalid field: Website)

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed