class.ilUriInputGUI.php

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<?php

declare(strict_types=1);

use ILIAS\Data\URI;

class ilUriInputGUI extends ilTextInputGUI
{
    protected ?int $maxlength = 500;
    protected int $size = 40;

    public function __construct(
        string $a_title = "",
        string $a_postvar = ""
    ) {
        global $DIC;

        $this->lng = $DIC->language();
        parent::__construct($a_title, $a_postvar);
        $this->setType("uri");
    }

    public function checkInput(): bool
    {
        $lng = $this->lng;

        // check required
        if ($this->getRequired() && trim($this->str($this->getPostVar())) == "") {
            $this->setAlert($lng->txt("msg_input_is_required"));
            return false;
        }

        $url = $this->getInput();

        try {
            new URI($url);
        } catch (Throwable $e) {
            $this->setAlert($lng->txt("form_invalid_uri"));
            return false;
        }

        return true;
    }
}