[10.x] Allow to specify protocols in URL validation

[MrMicky-FR]

This PR makes it possible to specify which protocols are allowed in URL validation.

This can be useful in two situations:

• To use exotic protocols that are not in the hardcoded protocols list without having to modify the list directly in Laravel
• To authorize only some specific protocols (e.g. only https to force secure links)

There is no breaking changes, as the default behavior (when no parameters are used) is the same as current: only the protocols in the existing list are allowed.

Example usage:

$v = Validator::make($data, [
    'url' => 'sometimes|url', // current behaviour
    'link' => 'sometimes|url:http,https', // only http and https
    'secure_link' => 'sometimes|url:https', // only https
]);

[taylorotwell]

Just combine url and starts_with validation rules.

[MrMicky-FR]

Just combine url and starts_with validation rules.

@taylorotwell Thank you, it work in the second case, but, in the first case it’s not a solution as the rule will always fail if the protocol isn't in the list (just realized I added a test for this use case, but forgot it in my code example, sorry!)

In my case the valid minecraft:// protocol is failing, so there is a need for a new PR each time a new protocol is required ?

Updated example usage:

$v = Validator::make($data, [
    'url' => 'sometimes|url', // current behaviour
    'link' => 'sometimes|url:http,https', // only http and https
    'game_join_url' => 'sometimes|url:minecraft,steam', // also support more protocols such as 'minecraft://'
]);

Thanks again