Modify URL validation to accept non-ASCII characters

[ul8]

Domains containing non-ASCII characters are rejected in the URL validator

craft-linkfield/src/models/InputLinkType.php

Line 262 in ec8ffee

if (!filter_var($value, FILTER_VALIDATE_URL)) {

As the docs for FILTER_VALIDATE_URL state:

The function will only find ASCII URLs to be valid; internationalized domain names (containing non-ASCII characters) will fail.

I'm passing the url first through idn_to_ascii() to convert to a punycode url

https://www.php.net/manual/en/function.idn-to-ascii.php

So as an example, a domain such as http://www.tästdomäin.de will now be valid as it is internally first converted to http://www.xn--tstdomin-0zaf.de before validation.

The URL is finally still saved to DB in the original form including the Unicode chars, which is not valid by itself in browsers as a link. Users of the plugin thus must take care themselves to convert that as needed and write the punycode URL to href="" attributes, for example.

[sebastian-lenz]

Great, thanks for sharing this!