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Editing: FileDownload.php

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<?php

/**
 * Class represents records from table file_download
 * @property int $download_id
 * @property int $file_id
 * @property int $user_id
 * @property datetime $dattm 
 * @see Am_Table
 */
class FileDownload extends Am_Record
{

}

class FileDownloadTable extends Am_Table
{
    const PERIOD_HOUR = 3600;
    const PERIOD_DAY = 86400;
    const PERIOD_WEEK = 634800;
    const PERIOD_MONTH = 2592000;
    const PERIOD_YEAR = 31536000;
    const PERIOD_ALL = -1;
    const TOLERANCE = 60; //seconds

protected $_key = 'download_id';
    protected $_table = '?_file_download';
    protected $_recordClass = 'FileDownload';

function checkLimits(User $user, File $file)
    {
        if (!$file->download_limit)
            return true; //no limits at all

list($limit, $period) = explode(':', $file->download_limit);
        $cond = array(
            'user_id' => $user->pk(),
            'file_id' => $file->pk()
        );
        if ($period != self::PERIOD_ALL)
        {
            $begin_date = $this->getDi()->dateTime;
            $begin_date->modify('-' . $period . ' seconds');
            $begin_date = $begin_date->format('Y-m-d H:i:s');
            $cond['dattm'] = '>' . $begin_date;
        }
        $count = $this->countBy($cond);

return $limit > $count;
    }

function logDownload(User $user, File $file, $ip = '')
    {
        $begin_date = $this->getDi()->dateTime;
        $begin_date->modify('-' . self::TOLERANCE . ' seconds');
        $begin_date = $begin_date->format('Y-m-d H:i:s');
        $count = $this->countBy(array(
                'user_id' => $user->pk(),
                'file_id' => $file->pk(),
                'dattm' => '>' . $begin_date
            ));

if (!$count)
        {
            $this->insert(array(
                'user_id' => $user->pk(),
                'file_id' => $file->pk(),
                'dattm' => $this->getDi()->sqlDateTime,
                'remote_addr' => $ip
            ));
        }
    }

}

Editing: FileDownload.php

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