streams/Code/Module/Admin/Logs.php

<?php

namespace Code\Module\Admin;

use Code\Render\Theme;


class Logs
{


    /**
     * @brief POST handler for logs admin page.
     *
     */

    public function post()
    {
        if (x($_POST, 'page_logs')) {
            check_form_security_token_redirectOnErr('/admin/logs', 'admin_logs');

            $logfile = ((x($_POST, 'logfile')) ? notags(trim($_POST['logfile'])) : '');
            $debugging = ((x($_POST, 'debugging')) ? true : false);
            $loglevel = ((x($_POST, 'loglevel')) ? intval(trim($_POST['loglevel'])) : 0);

            set_config('system', 'logfile', $logfile);
            set_config('system', 'debugging', $debugging);
            set_config('system', 'loglevel', $loglevel);
        }

        info(t('Log settings updated.'));
        goaway(z_root() . '/admin/logs');
    }

    /**
     * @brief Logs admin page.
     *
     * @return string
     */

    public function get()
    {

        $log_choices = [
            LOGGER_NORMAL => 'Normal',
            LOGGER_TRACE => 'Trace',
            LOGGER_DEBUG => 'Debug',
            LOGGER_DATA => 'Data',
            LOGGER_ALL => 'All'
        ];

        $t = Theme::get_template('admin_logs.tpl');

        $f = get_config('system', 'logfile');

        $data = '';

        if (!file_exists($f)) {
            $data = t("Error trying to open <strong>$f</strong> log file.\r\n<br/>Check to see if file $f exist and is 
	readable.");
        } else {
            $fp = fopen($f, 'r');
            if (!$fp) {
                $data = t("Couldn't open <strong>$f</strong> log file.\r\n<br/>Check to see if file $f is readable.");
            } else {
                $fstat = fstat($fp);
                $size = $fstat['size'];
                if ($size != 0) {
                    if ($size > 5000000 || $size < 0) {
                        $size = 5000000;
                    }
                    $seek = fseek($fp, 0 - $size, SEEK_END);
                    if ($seek === 0) {
                        $data = escape_tags(fread($fp, $size));
                        while (!feof($fp)) {
                            $data .= escape_tags(fread($fp, 4096));
                        }
                    }
                }
                fclose($fp);
            }
        }

        return replace_macros($t, [
            '$title' => t('Administration'),
            '$page' => t('Logs'),
            '$submit' => t('Submit'),
            '$clear' => t('Clear'),
            '$data' => $data,
            '$baseurl' => z_root(),
            '$logname' => get_config('system', 'logfile'),

            // name, label, value, help string, extra data...
            '$debugging' => ['debugging', t('Debugging'), get_config('system', 'debugging'), ""],
            '$logfile' => ['logfile', t('Log file'), get_config('system', 'logfile'), t("Must be writable by web server. Relative to your top-level webserver directory.")],
            '$loglevel' => ['loglevel', t('Log level'), get_config('system', 'loglevel'), "", $log_choices],

            '$form_security_token' => get_form_security_token('admin_logs'),
        ]);
    }
}