Subversion Repositories Applications.papyrus

<?php

////////////////////////////////////////////////////////////////////////////////

//                                                                            //

//   Copyright (C) 2006  Phorum Development Team                              //

//   http://www.phorum.org                                                    //

//                                                                            //

//   This program is free software. You can redistribute it and/or modify     //

//   it under the terms of either the current Phorum License (viewable at     //

//   phorum.org) or the Phorum License that was distributed with this file    //

//                                                                            //

//   This program is distributed in the hope that it will be useful,          //

//   but WITHOUT ANY WARRANTY, without even the implied warranty of           //

//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     //

//                                                                            //

//   You should have received a copy of the Phorum License                    //

//   along with this program.                                                 //

////////////////////////////////////////////////////////////////////////////////

    // Check if the Phorum file uploading settings match the

    // limits that are imposed by the system.

    // TODO (document in faq / documentation)

    // The upload size can be limited by Apache's LimitRequestBody directive,

    // but we cannot check that one from PHP.

    require_once('./include/format_functions.php'); // For phorum_filesize()

    $phorum_check = "File uploading (personal files and attachments)";

    function phorum_check_upload_limits() {

        $PHORUM = $GLOBALS["PHORUM"];

        // Keep track if uploads are used.

        $upload_used = false;

        // Get the maximum file upload size for PHP.

        $php_max_upload = phorum_php_max_upload();

        // Get the maximum packet size for the database.

        // For determining the maximum allowed upload size,

        // we have to take packet overhead into account.

        $max_packetsize = phorum_db_maxpacketsize();

        if ($max_packetsize == NULL) {

            $db_max_upload = $php_max_upload;

        } else {

            $db_max_upload = phorum_db_maxpacketsize() * 0.6;

        }

        // Check limits for file uploading in personal profile.

        if ($PHORUM["file_uploads"] && $PHORUM["max_file_size"]) {

            $upload_used = true;

            $res = phorum_single_check_upload_limits(

                $PHORUM["max_file_size"]*1024,

                "the Max File Size option for user file uploads " .

                "(in their profile)",

                $php_max_upload, $db_max_upload

            );

            if ($res != NULL) return $res;

        }

        // Check limits for attachment uploading in forums.

        $forums = phorum_db_get_forums();

        foreach ($forums as $id => $forum) {

            if ($forum["max_attachments"] > 0 && $forum["max_attachment_size"]) {

                $upload_used = true;

                $res = phorum_single_check_upload_limits(

                    $forum["max_attachment_size"]*1024,

                    "the Max File Size option for uploading attachments

                     in the forum \"{$forum['name']}\"",

                    $php_max_upload, $db_max_upload

                );

            }

        }

        // No upload functionality found so far? Then we're done.

        if (! $upload_used) return array(PHORUM_SANITY_OK, NULL);

        // Check if the upload temp directory can be written.

        $tmpdir = get_cfg_var('upload_tmp_dir');

        if (!empty($tmpdir)) {

            $fp = @fopen("$tmpdir/sanity_checks_dummy_uploadtmpfile", "w");

            if (! $fp) return array(

                PHORUM_SANITY_CRIT,

                "The system is unable to write files

                 to PHP's upload tmpdir \"".htmlspecialchars($tmpdir)."\".

                 The system error was:<br/><br/>".

                 htmlspecialchars($php_errormsg).".",

                "Change the upload_tmp_dir setting in your php.ini file

                 or give your webserver more permissions for the current

                 upload directory."

            );

        }

        fclose($fp);

        unlink("$tmpdir/sanity_checks_dummy_uploadtmpfile");

        return array(PHORUM_SANITY_OK, NULL);

    }

    // ========================================================================

    // Helper functions

    // ========================================================================

    // We have to check multiple upload limits. Using this function,

    // we do not have to rebuild all error messages over and over

    // again.

    function phorum_single_check_upload_limits ($howmuch, $what, $maxphp, $maxdb)

    {

        // Check PHP limits.

        if (!empty($maxphp) && $howmuch > $maxphp) return array(

            PHORUM_SANITY_WARN,

            "You have configured ".htmlspecialchars($what)." to ".

             phorum_filesize($howmuch).". Your PHP installation only

             supports ".phorum_filesize($maxphp).". Your users might

             have problems with uploading their files because of this.",

            "Raise the options post_max_size and upload_max_filesize in your

             php.ini file to match the Max File Size option or lower this

             configuration option for your forums."

        );

        // Check database limits.

        if (!empty($maxdb) && $howmuch > $maxdb) return array(

            PHORUM_SANITY_WARN,

            "You have configured ".htmlspecialchars($what)." to ".

             phorum_filesize($howmuch).". Your database only supports ".

             phorum_filesize($maxdb).". Your users might have problems with

             uploading their files because of this.",

            "Configure your database to allow larger packets or lower the

             Max File Size configuration option for your forums."

        );

        return NULL;

    }

    function phorum_php_max_upload()

    {

        // Determine the PHP system upload limit. The limit for

        // maximum upload filesize is not the only thing we

        // have to look at. We should also take the maximum

        // POST size in account.

        $pms = phorum_phpcfgsize2bytes(get_cfg_var('post_max_size'));

        $umf = phorum_phpcfgsize2bytes(get_cfg_var('upload_max_filesize'));

        $limit = ($umf > $pms ? $pms : $umf);

        return $limit;

    }

    // Convert the size parameters that can be used in the

    // PHP ini-file (e.g. 1024, 10k, 8M) to a number of bytes.

    function phorum_phpcfgsize2bytes($val) {

        $val = trim($val);

        $last = strtolower($val{strlen($val)-1});

        switch($last) {

           // The 'G' modifier is available since PHP 5.1.0

           case 'g':

               $val *= 1024;

           case 'm':

               $val *= 1024;

           case 'k':

               $val *= 1024;

        }

        return $val;

    }

?>