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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Main export handling code
 *
 * @package PhpMyAdmin
 */
declare(strict_types=1);

use PhpMyAdmin\Core;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Encoding;
use PhpMyAdmin\Export;
use PhpMyAdmin\Plugins;
use PhpMyAdmin\Plugins\ExportPlugin;
use PhpMyAdmin\Relation;
use PhpMyAdmin\Response;
use PhpMyAdmin\Sanitize;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Statements\SelectStatement;
use PhpMyAdmin\SqlParser\Utils\Misc;
use PhpMyAdmin\Url;
use PhpMyAdmin\Util;

if (! defined('ROOT_PATH')) {
    define('ROOT_PATH', __DIR__ . DIRECTORY_SEPARATOR);
}

global $db, $sql_query;

include_once ROOT_PATH . 'libraries/common.inc.php';

/** @var Response $response */
$response = $containerBuilder->get(Response::class);

/** @var DatabaseInterface $dbi */
$dbi = $containerBuilder->get(DatabaseInterface::class);

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

/** @var Export $export */
$export = $containerBuilder->get('export');

//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 = [
    '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_view_current_user',
    'sql_if_not_exists',
    'sql_or_replace_view',
    '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(['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 ExportPlugin $export_plugin */
$export_plugin = Plugins::getPlugin(
    "export",
    $what,
    'libraries/classes/Plugins/Export/',
    [
        '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 = [
    'zip',
    'gzip',
];

/**
 * init and variable checking
 */
$compression = '';
$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)
    do {
        $hasBuffer = @ob_end_clean();
    } while ($hasBuffer);
}

$tables = [];
// Generate error url and check for needed variables
if ($export_type == 'server') {
    $err_url = 'server_export.php' . Url::getCommon();
} elseif ($export_type == 'database' && strlen($db) > 0) {
    $err_url = 'db_export.php' . Url::getCommon(['db' => $db]);
    // Check if we have something to export
    if (isset($table_select)) {
        $tables = $table_select;
    } else {
        $tables = [];
    }
} elseif ($export_type == 'table' && strlen($db) > 0 && strlen($table) > 0) {
    $err_url = 'tbl_export.php' . Url::getCommon(
        [
            '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.
$parser = new Parser($sql_query);
$aliases = [];
if (! empty($parser->statements[0])
    && ($parser->statements[0] instanceof SelectStatement)
) {
    $aliases = Misc::getAliases($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', $cfg['MemoryLimit']);
}
register_shutdown_function([$export, 'shutdown']);
// Start with empty buffer
$dump_buffer = '';
$dump_buffer_len = 0;

// Array of dump_buffers - used in separate file exports
$dump_buffer_objects = [];

// 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.')
                );
                $active_page = 'db_export.php';
                include ROOT_PATH . 'db_export.php';
                exit;
            }
        }
        list($html, $back_button, $refreshButton) = $export->getHtmlForDisplayedExportHeader(
            $export_type,
            $db,
            $table
        );
        echo $html;
        unset($html);
    } // end download
}

/** @var Relation $relation */
$relation = $containerBuilder->get('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)) {
            $table_structure = [];
        }
        if (! isset($table_data) || ! is_array($table_data)) {
            $table_data = [];
        }
        if (! empty($_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, [$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;
}