class.ilHtmlImageMapFileInputGUI.php

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<?php

class ilHtmlImageMapFileInputGUI extends ilFileInputGUI
{
    protected $shapes = array();

    public function checkInput(): bool
    {
        global $DIC;
        $lng = $DIC['lng'];

        if (!parent::checkInput()) {
            return false;
        }

        $tmp_file_name = $_FILES[$this->getPostVar()]['tmp_name'];
        if (strlen($tmp_file_name) == 0) {
            return true;
        }

        if (!is_readable($tmp_file_name)) {
            $this->setAlert($lng->txt('ass_imap_map_file_not_readable'));
            return false;
        }

        $contents = file_get_contents($tmp_file_name);
        $matches = null;
        if (
            !preg_match_all('/<area(.+)>/siU', $contents, $matches) ||
            !is_array($matches) ||
            !isset($matches[1]) ||
            count($matches[1]) == 0
        ) {
            $this->setAlert($lng->txt('ass_imap_no_map_found'));
            return false;
        }

        for ($i = 0; $i < count($matches[1]); $i++) {
            preg_match("/alt\s*=\s*\"(.*)\"\s*/siU", $matches[1][$i], $alt);
            preg_match("/coords\s*=\s*\"(.+)\"\s*/siU", $matches[1][$i], $coords);
            preg_match("/shape\s*=\s*\"(.+)\"\s*/siU", $matches[1][$i], $shape);

            if (!$this->verifyArea($coords, $shape)) {
                $this->setAlert($lng->txt('ass_imap_no_map_found'));
                return false;
            }

            $this->shapes[] = new ASS_AnswerImagemap($alt[1], 0.0, $i, $coords[1], $shape[1]);
        }

        return true;
    }

    protected function verifyArea($coords, $shape)
    {
        if (!in_array(strtolower($shape[1]), assImagemapQuestion::AVAILABLE_SHAPES)) {
            return false;
        }

        $coords_array = explode(',', $coords[1]);
        foreach ($coords_array as $coord) {
            if (!is_numeric($coord)) {
                return false;
            }
        }

        return true;
    }

    public function getShapes(): array
    {
        return $this->shapes;
    }
}