<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Main export handling code
 *
 * @package PhpMyAdmin
 */

use PhpMyAdmin\Core;
use PhpMyAdmin\Encoding;
use PhpMyAdmin\Export;
use PhpMyAdmin\Plugins;
use PhpMyAdmin\Plugins\ExportPlugin;
use PhpMyAdmin\Relation;
use PhpMyAdmin\Sanitize;
use PhpMyAdmin\Url;
use PhpMyAdmin\Util;
use PhpMyAdmin\Response;

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

$response = Response::getInstance();
$header   = $response->getHeader();
$scripts  = $header->getScripts();
$scripts->addFile('export_output.js');

//check if it's the GET request to check export time out
if (isset($_GET['check_time_out'])) {
    if (isset($_SESSION['pma_export_error'])) {
        $err = $_SESSION['pma_export_error'];
        unset($_SESSION['pma_export_error']);
        echo "timeout";
    } else {
        echo "success";
    }
    exit;
}

/**
 * Sets globals from $_POST
 *
 * - Please keep the parameters in order of their appearance in the form
 * - Some of these parameters are not used, as the code below directly
 *   verifies from the superglobal $_POST or $_REQUEST
 * TODO: this should be removed to avoid passing user input to GLOBALS
 * without checking
 */
$post_params = array(
        'db',
        'table',
        'what',
        'single_table',
        'export_type',
        'export_method',
        'quick_or_custom',
        'db_select',
        'table_select',
        'table_structure',
        'table_data',
        'limit_to',
        'limit_from',
        'allrows',
        'lock_tables',
        'output_format',
        'filename_template',
        'maxsize',
        'remember_template',
        'charset',
        'compression',
        'as_separate_files',
        'knjenc',
        'xkana',
        'htmlword_structure_or_data',
        'htmlword_null',
        'htmlword_columns',
        'mediawiki_headers',
        'mediawiki_structure_or_data',
        'mediawiki_caption',
        'pdf_structure_or_data',
        'odt_structure_or_data',
        'odt_relation',
        'odt_comments',
        'odt_mime',
        'odt_columns',
        'odt_null',
        'codegen_structure_or_data',
        'codegen_format',
        'excel_null',
        'excel_removeCRLF',
        'excel_columns',
        'excel_edition',
        'excel_structure_or_data',
        'yaml_structure_or_data',
        'ods_null',
        'ods_structure_or_data',
        'ods_columns',
        'json_structure_or_data',
        'json_pretty_print',
        'json_unicode',
        'xml_structure_or_data',
        'xml_export_events',
        'xml_export_functions',
        'xml_export_procedures',
        'xml_export_tables',
        'xml_export_triggers',
        'xml_export_views',
        'xml_export_contents',
        'texytext_structure_or_data',
        'texytext_columns',
        'texytext_null',
        'phparray_structure_or_data',
        'sql_include_comments',
        'sql_header_comment',
        'sql_dates',
        'sql_relation',
        'sql_mime',
        'sql_use_transaction',
        'sql_disable_fk',
        'sql_compatibility',
        'sql_structure_or_data',
        'sql_create_database',
        'sql_drop_table',
        'sql_procedure_function',
        'sql_create_table',
        'sql_create_view',
        'sql_create_trigger',
        'sql_if_not_exists',
        'sql_auto_increment',
        'sql_backquotes',
        'sql_truncate',
        'sql_delayed',
        'sql_ignore',
        'sql_type',
        'sql_insert_syntax',
        'sql_max_query_size',
        'sql_hex_for_binary',
        'sql_utc_time',
        'sql_drop_database',
        'sql_views_as_tables',
        'sql_metadata',
        'csv_separator',
        'csv_enclosed',
        'csv_escaped',
        'csv_terminated',
        'csv_null',
        'csv_removeCRLF',
        'csv_columns',
        'csv_structure_or_data',
        // csv_replace should have been here but we use it directly from $_POST
        'latex_caption',
        'latex_structure_or_data',
        'latex_structure_caption',
        'latex_structure_continued_caption',
        'latex_structure_label',
        'latex_relation',
        'latex_comments',
        'latex_mime',
        'latex_columns',
        'latex_data_caption',
        'latex_data_continued_caption',
        'latex_data_label',
        'latex_null',
        'aliases'
);

foreach ($post_params as $one_post_param) {
    if (isset($_POST[$one_post_param])) {
        $GLOBALS[$one_post_param] = $_POST[$one_post_param];
    }
}

$table = $GLOBALS['table'];

PhpMyAdmin\Util::checkParameters(array('what', 'export_type'));

// sanitize this parameter which will be used below in a file inclusion
$what = Core::securePath($_POST['what']);

// export class instance, not array of properties, as before
/* @var $export_plugin ExportPlugin */
$export_plugin = Plugins::getPlugin(
    "export",
    $what,
    'libraries/classes/Plugins/Export/',
    array(
        'export_type' => $export_type,
        'single_table' => isset($single_table)
    )
);

// Check export type
if (empty($export_plugin)) {
    Core::fatalError(__('Bad type!'));
}

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

/**
 * init and variable checking
 */
$compression = false;
$onserver = false;
$save_on_server = false;
$buffer_needed = false;
$back_button = '';
$refreshButton = '';
$save_filename = '';
$file_handle = '';
$err_url = '';
$filename = '';
$separate_files = '';

// Is it a quick or custom export?
if (isset($_POST['quick_or_custom'])
    && $_POST['quick_or_custom'] == 'quick'
) {
    $quick_export = true;
} else {
    $quick_export = false;
}

if ($_POST['output_format'] == 'astext') {
    $asfile = false;
} else {
    $asfile = true;
    if (isset($_POST['as_separate_files'])
        && ! empty($_POST['as_separate_files'])
    ) {
        if (isset($_POST['compression'])
            && ! empty($_POST['compression'])
            && $_POST['compression'] == 'zip'
        ) {
            $separate_files = $_POST['as_separate_files'];
        }
    }
    if (in_array($_POST['compression'], $compression_methods)) {
        $compression = $_POST['compression'];
        $buffer_needed = true;
    }
    if (($quick_export && ! empty($_POST['quick_export_onserver']))
        || (! $quick_export && ! empty($_POST['onserver']))
    ) {
        if ($quick_export) {
            $onserver = $_POST['quick_export_onserver'];
        } else {
            $onserver = $_POST['onserver'];
        }
        // Will we save dump on server?
        $save_on_server = ! empty($cfg['SaveDir']) && $onserver;
    }
}

/**
 * If we are sending the export file (as opposed to just displaying it
 * as text), we have to bypass the usual PhpMyAdmin\Response mechanism
 */
if (isset($_POST['output_format']) && $_POST['output_format'] == 'sendit' && ! $save_on_server) {
    $response->disable();
    //Disable all active buffers (see: ob_get_status(true) at this point)
    while (@ob_end_clean());
}

// Generate error url and check for needed variables
if ($export_type == 'server') {
    $err_url = 'server_export.php' . Url::getCommon();
} elseif ($export_type == 'database' && strlen($db) > 0) {
    $err_url = 'db_export.php' . Url::getCommon(array('db' => $db));
    // Check if we have something to export
    if (isset($table_select)) {
        $tables = $table_select;
    } else {
        $tables = array();
    }
} elseif ($export_type == 'table' && strlen($db) > 0 && strlen($table) > 0) {
    $err_url = 'tbl_export.php' . Url::getCommon(
        array(
            'db' => $db, 'table' => $table
        )
    );
} else {
    Core::fatalError(__('Bad parameters!'));
}

// Merge SQL Query aliases with Export aliases from
// export page, Export page aliases are given more
// preference over SQL Query aliases.
$parser = new \PhpMyAdmin\SqlParser\Parser($sql_query);
$aliases = array();
if ((!empty($parser->statements[0]))
    && ($parser->statements[0] instanceof \PhpMyAdmin\SqlParser\Statements\SelectStatement)
) {
    $aliases = \PhpMyAdmin\SqlParser\Utils\Misc::getAliases($parser->statements[0], $db);
}
if (!empty($_POST['aliases'])) {
    $aliases = Export::mergeAliases($aliases, $_POST['aliases']);
    $_SESSION['tmpval']['aliases'] = $_POST['aliases'];
}

/**
 * Increase time limit for script execution and initializes some variables
 */
Util::setTimeLimit();
if (! empty($cfg['MemoryLimit'])) {
    ini_set('memory_limit', $cfg['MemoryLimit']);
}
register_shutdown_function('PhpMyAdmin\Export::shutdown');
// Start with empty buffer
$dump_buffer = '';
$dump_buffer_len = 0;

// Array of dump_buffers - used in separate file exports
$dump_buffer_objects = array();

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

// 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 = PHP_EOL;
}

$output_kanji_conversion = Encoding::canConvertKanji();

// Do we need to convert charset?
$output_charset_conversion = $asfile
    && Encoding::isSupported()
    && isset($charset) && $charset != 'utf-8';

// Use on the fly compression?
$GLOBALS['onfly_compression'] = $GLOBALS['cfg']['CompressOnFly']
    && $compression == 'gzip';
if ($GLOBALS['onfly_compression']) {
    $GLOBALS['memory_limit'] = Export::getMemoryLimit();
}

// Generate filename and mime type if needed
if ($asfile) {
    if (empty($remember_template)) {
        $remember_template = '';
    }
    list($filename, $mime_type) = Export::getFilenameAndMimetype(
        $export_type, $remember_template, $export_plugin, $compression,
        $filename_template
    );
} else {
    $mime_type = '';
}

// Open file on server if needed
if ($save_on_server) {
    list($save_filename, $message, $file_handle) = Export::openFile(
        $filename, $quick_export
    );

    // problem opening export file on server?
    if (! empty($message)) {
        Export::showPage($db, $table, $export_type);
    }
} else {
    /**
     * Send headers depending on whether the user chose to download a dump file
     * or not
     */
    if ($asfile) {
        // Download
        // (avoid rewriting data containing HTML with anchors and forms;
        // this was reported to happen under Plesk)
        ini_set('url_rewriter.tags', '');
        $filename = Sanitize::sanitizeFilename($filename);

        Core::downloadHeader($filename, $mime_type);
    } else {
        // HTML
        if ($export_type == 'database') {
            $num_tables = count($tables);
            if ($num_tables == 0) {
                $message = PhpMyAdmin\Message::error(
                    __('No tables found in database.')
                );
                $active_page = 'db_export.php';
                include 'db_export.php';
                exit();
            }
        }
        list($html, $back_button, $refreshButton) = Export::getHtmlForDisplayedExportHeader(
            $export_type, $db, $table
        );
        echo $html;
        unset($html);
    } // end download
}

$relation = new Relation();

// Fake loop just to allow skip of remain of this code by break, I'd really
// need exceptions here :-)
do {
    // Re - initialize
    $dump_buffer = '';
    $dump_buffer_len = 0;

    // Add possibly some comments to export
    if (! $export_plugin->exportHeader()) {
        break;
    }

    // Will we need relation & co. setup?
    $do_relation = isset($GLOBALS[$what . '_relation']);
    $do_comments = isset($GLOBALS[$what . '_include_comments'])
        || isset($GLOBALS[$what . '_comments']);
    $do_mime     = isset($GLOBALS[$what . '_mime']);
    if ($do_relation || $do_comments || $do_mime) {
        $cfgRelation = $relation->getRelationsParam();
    }

    // Include dates in export?
    $do_dates = isset($GLOBALS[$what . '_dates']);

    $whatStrucOrData = $GLOBALS[$what . '_structure_or_data'];

    /**
     * Builds the dump
     */
    if ($export_type == 'server') {
        if (! isset($db_select)) {
            $db_select = '';
        }
        Export::exportServer(
            $db_select, $whatStrucOrData, $export_plugin, $crlf, $err_url,
            $export_type, $do_relation, $do_comments, $do_mime, $do_dates,
            $aliases, $separate_files
        );
    } elseif ($export_type == 'database') {
        if (!isset($table_structure) || !is_array($table_structure)) {
            $table_structure = array();
        }
        if (!isset($table_data) || !is_array($table_data)) {
            $table_data = array();
        }
        if (!empty($_POST['structure_or_data_forced'])) {
            $table_structure = $tables;
            $table_data = $tables;
        }
        if (isset($lock_tables)) {
            Export::lockTables($db, $tables, "READ");
            try {
                Export::exportDatabase(
                    $db, $tables, $whatStrucOrData, $table_structure,
                    $table_data, $export_plugin, $crlf, $err_url, $export_type,
                    $do_relation, $do_comments, $do_mime, $do_dates, $aliases,
                    $separate_files
                );
            } finally {
                Export::unlockTables();
            }
        } else {
            Export::exportDatabase(
                $db, $tables, $whatStrucOrData, $table_structure, $table_data,
                $export_plugin, $crlf, $err_url, $export_type, $do_relation,
                $do_comments, $do_mime, $do_dates, $aliases, $separate_files
            );
        }
    } else {
        // We export just one table
        // $allrows comes from the form when "Dump all rows" has been selected
        if (! isset($allrows)) {
            $allrows = '';
        }
        if (! isset($limit_to)) {
            $limit_to = 0;
        }
        if (! isset($limit_from)) {
            $limit_from = 0;
        }
        if (isset($lock_tables)) {
            try {
                Export::lockTables($db, array($table), "READ");
                Export::exportTable(
                    $db, $table, $whatStrucOrData, $export_plugin, $crlf,
                    $err_url, $export_type, $do_relation, $do_comments,
                    $do_mime, $do_dates, $allrows, $limit_to, $limit_from,
                    $sql_query, $aliases
                );
            } finally {
                Export::unlockTables();
            }
        } else {
            Export::exportTable(
                $db, $table, $whatStrucOrData, $export_plugin, $crlf, $err_url,
                $export_type, $do_relation, $do_comments, $do_mime, $do_dates,
                $allrows, $limit_to, $limit_from, $sql_query, $aliases
            );
        }
    }
    if (! $export_plugin->exportFooter()) {
        break;
    }

} while (false);
// End of fake loop

if ($save_on_server && ! empty($message)) {
    Export::showPage($db, $table, $export_type);
}

/**
 * Send the dump as a file...
 */
if (empty($asfile)) {
    echo Export::getHtmlForDisplayedExportFooter($back_button, $refreshButton);
    return;
} // end if

// Convert the charset if required.
if ($output_charset_conversion) {
    $dump_buffer = Encoding::convertString(
        'utf-8',
        $GLOBALS['charset'],
        $dump_buffer
    );
}

// Compression needed?
if ($compression) {
    if (! empty($separate_files)) {
        $dump_buffer = Export::compress(
            $dump_buffer_objects, $compression, $filename
        );
    } else {
        $dump_buffer = Export::compress($dump_buffer, $compression, $filename);
    }

}

/* If we saved on server, we have to close file now */
if ($save_on_server) {
    $message = Export::closeFile(
        $file_handle, $dump_buffer, $save_filename
    );
    Export::showPage($db, $table, $export_type);
} else {
    echo $dump_buffer;
}