export.php

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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * @todo    too much die here, or?
 * @version $Id: export.php 11626 2008-10-01 20:48:40Z lem9 $
 */

/**
 * Get the variables sent or posted to this script and a core script
 */
require_once './libraries/common.inc.php';
require_once './libraries/zip.lib.php';
require_once './libraries/plugin_interface.lib.php';

PMA_checkParameters(array('what', 'export_type'));

// Scan plugins
$export_list = PMA_getPlugins('./libraries/export/', array('export_type' => $export_type, 'single_table' => isset($single_table)));

// Backward compatbility
$type = $what;

// Check export type
if (!isset($export_list[$type])) {
    die('Bad type!');
}

/**
 * valid compression methods
 */
$compression_methods = array(
    'zip',
    'gzip',
    'bzip',
);

/**
 * init and variable checking
 */
$compression = false;
$onserver = false;
$save_on_server = false;
$buffer_needed = false;
if (empty($_REQUEST['asfile'])) {
    $asfile = false;
} else {
    $asfile = true;
    if (in_array($_REQUEST['compression'], $compression_methods)) {
        $compression = $_REQUEST['compression'];
        $buffer_needed = true;
    }
    if (!empty($_REQUEST['onserver'])) {
        $onserver = $_REQUEST['onserver'];
        // Will we save dump on server?
        $save_on_server = ! empty($cfg['SaveDir']) && $onserver;
    }
}

// Does export require to be into file?
if (isset($export_list[$type]['force_file']) && ! $asfile) {
    $message = PMA_Message::error('strExportMustBeFile');
    $GLOBALS['js_include'][] = 'functions.js';
    require_once './libraries/header.inc.php';
    if ($export_type == 'server') {
        $active_page = 'server_export.php';
        require './server_export.php';
    } elseif ($export_type == 'database') {
        $active_page = 'db_export.php';
        require './db_export.php';
    } else {
        $active_page = 'tbl_export.php';
        require './tbl_export.php';
    }
    exit();
}

// Generate error url and check for needed variables
if ($export_type == 'server') {
    $err_url = 'server_export.php?' . PMA_generate_common_url();
} elseif ($export_type == 'database' && strlen($db)) {
    $err_url = 'db_export.php?' . PMA_generate_common_url($db);
    // Check if we have something to export
    if (isset($table_select)) {
        $tables = $table_select;
    } else {
        $tables = array();
    }
} elseif ($export_type == 'table' && strlen($db) && strlen($table)) {
    $err_url = 'tbl_export.php?' . PMA_generate_common_url($db, $table);
} else {
    die('Bad parameters!');
}

// Get the functions specific to the export type
require './libraries/export/' . PMA_securePath($type) . '.php';

/**
 * Increase time limit for script execution and initializes some variables
 */
@set_time_limit($cfg['ExecTimeLimit']);
if (!empty($cfg['MemoryLimit'])) {
    @ini_set('memory_limit', $cfg['MemoryLimit']);
}

// Start with empty buffer
$dump_buffer = '';
$dump_buffer_len = 0;

// We send fake headers to avoid browser timeout when buffering
$time_start = time();


/**
 * Output handler for all exports, if needed buffering, it stores data into
 * $dump_buffer, otherwise it prints thems out.
 *
 * @param   string  the insert statement
 *
 * @return  bool    Whether output suceeded
 */
function PMA_exportOutputHandler($line)
{
    global $time_start, $dump_buffer, $dump_buffer_len, $save_filename;

    // Kanji encoding convert feature
    if ($GLOBALS['output_kanji_conversion']) {
        $line = PMA_kanji_str_conv($line, $GLOBALS['knjenc'], isset($GLOBALS['xkana']) ? $GLOBALS['xkana'] : '');
    }
    // If we have to buffer data, we will perform everything at once at the end
    if ($GLOBALS['buffer_needed']) {

        $dump_buffer .= $line;
        if ($GLOBALS['onfly_compression']) {

            $dump_buffer_len += strlen($line);

            if ($dump_buffer_len > $GLOBALS['memory_limit']) {
                if ($GLOBALS['output_charset_conversion']) {
                    $dump_buffer = PMA_convert_string($GLOBALS['charset'], $GLOBALS['charset_of_file'], $dump_buffer);
                }
                // as bzipped
                if ($GLOBALS['compression'] == 'bzip'  && @function_exists('bzcompress')) {
                    $dump_buffer = bzcompress($dump_buffer);
                }
                // as a gzipped file
                elseif ($GLOBALS['compression'] == 'gzip' && @function_exists('gzencode')) {
                    // without the optional parameter level because it bug
                    $dump_buffer = gzencode($dump_buffer);
                }
                if ($GLOBALS['save_on_server']) {
                    $write_result = @fwrite($GLOBALS['file_handle'], $dump_buffer);
                    if (!$write_result || ($write_result != strlen($dump_buffer))) {
                        $GLOBALS['message'] = PMA_Message::error('strNoSpace');
                        $GLOBALS['message']->addParam($save_filename);
                        return false;
                    }
                } else {
                    echo $dump_buffer;
                }
                $dump_buffer = '';
                $dump_buffer_len = 0;
            }
        } else {
            $time_now = time();
            if ($time_start >= $time_now + 30) {
                $time_start = $time_now;
                header('X-pmaPing: Pong');
            } // end if
        }
    } else {
        if ($GLOBALS['asfile']) {
            if ($GLOBALS['output_charset_conversion']) {
                $line = PMA_convert_string($GLOBALS['charset'], $GLOBALS['charset_of_file'], $line);
            }
            if ($GLOBALS['save_on_server'] && strlen($line) > 0) {
                $write_result = @fwrite($GLOBALS['file_handle'], $line);
                if (!$write_result || ($write_result != strlen($line))) {
                    $GLOBALS['message'] = PMA_Message::error('strNoSpace');
                    $GLOBALS['message']->addParam($save_filename);
                    return false;
                }
                $time_now = time();
                if ($time_start >= $time_now + 30) {
                    $time_start = $time_now;
                    header('X-pmaPing: Pong');
                } // end if
            } else {
                // We export as file - output normally
                echo $line;
            }
        } else {
            // We export as html - replace special chars
            echo htmlspecialchars($line);
        }
    }
    return true;
} // end of the 'PMA_exportOutputHandler()' function

// Defines the default <CR><LF> format. For SQL always use \n as MySQL wants this on all platforms.
if ($what == 'sql') {
    $crlf = "\n";
} else {
    $crlf = PMA_whichCrlf();
}

$output_kanji_conversion = function_exists('PMA_kanji_str_conv') && $type != 'xls';

// Do we need to convert charset?
$output_charset_conversion = $asfile && $cfg['AllowAnywhereRecoding']
    && isset($charset_of_file) && $charset_of_file != $charset
    && $type != 'xls';

// Use on the fly compression?
$onfly_compression = $GLOBALS['cfg']['CompressOnFly'] && ($compression == 'gzip' || $compression == 'bzip');
if ($onfly_compression) {
    $memory_limit = trim(@ini_get('memory_limit'));
    // 2 MB as default
    if (empty($memory_limit)) {
        $memory_limit = 2 * 1024 * 1024;
    }

    if (strtolower(substr($memory_limit, -1)) == 'm') {
        $memory_limit = (int)substr($memory_limit, 0, -1) * 1024 * 1024;
    } elseif (strtolower(substr($memory_limit, -1)) == 'k') {
        $memory_limit = (int)substr($memory_limit, 0, -1) * 1024;
    } elseif (strtolower(substr($memory_limit, -1)) == 'g') {
        $memory_limit = (int)substr($memory_limit, 0, -1) * 1024 * 1024 * 1024;
    } else {
        $memory_limit = (int)$memory_limit;
    }

    // Some of memory is needed for other thins and as treshold.
    // Nijel: During export I had allocated (see memory_get_usage function)
    //        approx 1.2MB so this comes from that.
    if ($memory_limit > 1500000) {
        $memory_limit -= 1500000;
    }

    // Some memory is needed for compression, assume 1/3
    $memory_limit /= 8;
}

// Generate filename and mime type if needed
if ($asfile) {
    $pma_uri_parts = parse_url($cfg['PmaAbsoluteUri']);
    if ($export_type == 'server') {
        if (isset($remember_template)) {
            PMA_setCookie('pma_server_filename_template', $filename_template);
        }
        $filename = str_replace('__SERVER__', $GLOBALS['cfg']['Server']['host'], strftime($filename_template));
    } elseif ($export_type == 'database') {
        if (isset($remember_template)) {
            PMA_setCookie('pma_db_filename_template', $filename_template);
        }
        $filename = str_replace('__DB__', $db, str_replace('__SERVER__', $GLOBALS['cfg']['Server']['host'], strftime($filename_template)));
    } else {
        if (isset($remember_template)) {
            PMA_setCookie('pma_table_filename_template', $filename_template);
        }
        $filename = str_replace('__TABLE__', $table, str_replace('__DB__', $db, str_replace('__SERVER__', $GLOBALS['cfg']['Server']['host'], strftime($filename_template))));
    }

    // convert filename to iso-8859-1, it is safer
    if (!(isset($cfg['AllowAnywhereRecoding']) && $cfg['AllowAnywhereRecoding'] )) {
        $filename = PMA_convert_string($charset, 'iso-8859-1', $filename);
    } else {
        $filename = PMA_convert_string($convcharset, 'iso-8859-1', $filename);
    }

    // Grab basic dump extension and mime type
    $filename  .= '.' . $export_list[$type]['extension'];
    $mime_type  = $export_list[$type]['mime_type'];

    // If dump is going to be compressed, set correct encoding or mime_type and add
    // compression to extension
    $content_encoding = '';
    if ($compression == 'bzip') {
        $filename  .= '.bz2';
        // browsers don't like this:
        //$content_encoding = 'x-bzip2';
        $mime_type = 'application/x-bzip2';
    } elseif ($compression == 'gzip') {
        $filename  .= '.gz';
        // Needed to avoid recompression by server modules like mod_gzip.
        // It seems necessary to check about zlib.output_compression
        // to avoid compressing twice
        if (!@ini_get('zlib.output_compression')) {
            // On Firefox 3, sending this content encoding corrupts the .gz
            // (as tested on Windows and Linux) but detect GECKO 1.9
            if (! (PMA_USR_BROWSER_AGENT == 'GECKO' && PMA_USR_BROWSER_VER == '1.9')) {
                $content_encoding = 'x-gzip';
            }
            $mime_type = 'application/x-gzip';
        }
    } elseif ($compression == 'zip') {
        $filename  .= '.zip';
        $mime_type = 'application/zip';
    }
}

// Open file on server if needed
if ($save_on_server) {
    $save_filename = PMA_userDir($cfg['SaveDir']) . preg_replace('@[/\\\\]@', '_', $filename);
    unset($message);
    if (file_exists($save_filename) && empty($onserverover)) {
        $message = PMA_Message::error('strFileAlreadyExists');
        $message->addParam($save_filename);
    } else {
        if (is_file($save_filename) && !is_writable($save_filename)) {
            $message = PMA_Message::error('strNoPermission');
            $message->addParam($save_filename);
        } else {
            if (!$file_handle = @fopen($save_filename, 'w')) {
                $message = PMA_Message::error('strNoPermission');
                $message->addParam($save_filename);
            }
        }
    }
    if (isset($message)) {
        $GLOBALS['js_include'][] = 'functions.js';
        require_once './libraries/header.inc.php';
        if ($export_type == 'server') {
            $active_page = 'server_export.php';
            require './server_export.php';
        } elseif ($export_type == 'database') {
            $active_page = 'db_export.php';
            require './db_export.php';
        } else {
            $active_page = 'tbl_export.php';
            require './tbl_export.php';
        }
        exit();
    }
}

/**
 * Send headers depending on whether the user chose to download a dump file
 * or not
 */