phpmyadmin working

1 files changed, 1225 insertions, 0 deletions

diff --git a/srcs/phpmyadmin/libraries/classes/Export.php b/srcs/phpmyadmin/libraries/classes/Export.php
new file mode 100644
index 0000000..34a16b4
--- /dev/null
+++ b/srcs/phpmyadmin/libraries/classes/Export.php
@@ -0,0 +1,1225 @@
+<?php
+/* vim: set expandtab sw=4 ts=4 sts=4: */
+/**
+ * function for the main export logic
+ *
+ * @package PhpMyAdmin
+ */
+declare(strict_types=1);
+
+namespace PhpMyAdmin;
+
+use PhpMyAdmin\Plugins\ExportPlugin;
+use PhpMyAdmin\Plugins\SchemaPlugin;
+
+/**
+ * PhpMyAdmin\Export class
+ *
+ * @package PhpMyAdmin
+ */
+class Export
+{
+    /**
+     * @var DatabaseInterface
+     */
+    private $dbi;
+
+    /**
+     * Export constructor.
+     * @param DatabaseInterface $dbi DatabaseInterface instance
+     */
+    public function __construct($dbi)
+    {
+        $this->dbi = $dbi;
+    }
+
+    /**
+     * Sets a session variable upon a possible fatal error during export
+     *
+     * @return void
+     */
+    public function shutdown(): void
+    {
+        $error = error_get_last();
+        if ($error != null && mb_strpos($error['message'], "execution time")) {
+            //set session variable to check if there was error while exporting
+            $_SESSION['pma_export_error'] = $error['message'];
+        }
+    }
+
+    /**
+     * Detect ob_gzhandler
+     *
+     * @return bool
+     */
+    public function isGzHandlerEnabled(): bool
+    {
+        return in_array('ob_gzhandler', ob_list_handlers());
+    }
+
+    /**
+     * Detect whether gzencode is needed; it might not be needed if
+     * the server is already compressing by itself
+     *
+     * @return bool Whether gzencode is needed
+     */
+    public function gzencodeNeeded(): bool
+    {
+        /*
+         * We should gzencode only if the function exists
+         * but we don't want to compress twice, therefore
+         * gzencode only if transparent compression is not enabled
+         * and gz compression was not asked via $cfg['OBGzip']
+         * but transparent compression does not apply when saving to server
+         */
+        $chromeAndGreaterThan43 = PMA_USR_BROWSER_AGENT == 'CHROME'
+            && PMA_USR_BROWSER_VER >= 43; // see bug #4942
+
+        return function_exists('gzencode')
+            && ((! ini_get('zlib.output_compression')
+                    && ! $this->isGzHandlerEnabled())
+                || $GLOBALS['save_on_server']
+                || $chromeAndGreaterThan43);
+    }
+
+    /**
+     * Output handler for all exports, if needed buffering, it stores data into
+     * $dump_buffer, otherwise it prints them out.
+     *
+     * @param string $line the insert statement
+     *
+     * @return bool Whether output succeeded
+     */
+    public function outputHandler(?string $line): bool
+    {
+        global $time_start, $dump_buffer, $dump_buffer_len, $save_filename;
+
+        // Kanji encoding convert feature
+        if ($GLOBALS['output_kanji_conversion']) {
+            $line = Encoding::kanjiStrConv(
+                $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 = Encoding::convertString(
+                            'utf-8',
+                            $GLOBALS['charset'],
+                            $dump_buffer
+                        );
+                    }
+                    if ($GLOBALS['compression'] == 'gzip'
+                        && $this->gzencodeNeeded()
+                    ) {
+                        // as a gzipped file
+                        // without the optional parameter level because it bugs
+                        $dump_buffer = gzencode($dump_buffer);
+                    }
+                    if ($GLOBALS['save_on_server']) {
+                        $write_result = @fwrite($GLOBALS['file_handle'], $dump_buffer);
+                        // Here, use strlen rather than mb_strlen to get the length
+                        // in bytes to compare against the number of bytes written.
+                        if ($write_result != strlen($dump_buffer)) {
+                            $GLOBALS['message'] = Message::error(
+                                __('Insufficient space to save the file %s.')
+                            );
+                            $GLOBALS['message']->addParam($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 = $time_now;
+                    header('X-pmaPing: Pong');
+                } // end if
+            }
+        } elseif ($GLOBALS['asfile']) {
+            if ($GLOBALS['output_charset_conversion']) {
+                $line = Encoding::convertString(
+                    'utf-8',
+                    $GLOBALS['charset'],
+                    $line
+                );
+            }
+            if ($GLOBALS['save_on_server'] && mb_strlen($line) > 0) {
+                if ($GLOBALS['file_handle'] !== null) {
+                    $write_result = @fwrite($GLOBALS['file_handle'], $line);
+                } else {
+                    $write_result = false;
+                }
+                // Here, use strlen rather than mb_strlen to get the length
+                // in bytes to compare against the number of bytes written.
+                if (! $write_result
+                    || $write_result != strlen($line)
+                ) {
+                    $GLOBALS['message'] = Message::error(
+                        __('Insufficient space to save the file %s.')
+                    );
+                    $GLOBALS['message']->addParam($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;
+    }
+
+    /**
+     * Returns HTML containing the footer for a displayed export
+     *
+     * @param string $back_button   the link for going Back
+     * @param string $refreshButton the link for refreshing page
+     *
+     * @return string the HTML output
+     */
+    public function getHtmlForDisplayedExportFooter(
+        string $back_button,
+        string $refreshButton
+    ): string {
+        /**
+         * Close the html tags and add the footers for on-screen export
+         */
+        return '</textarea>'
+            . '    </form>'
+            . '<br>'
+            // bottom back button
+            . $back_button
+            . $refreshButton
+            . '</div>'
+            . '<script type="text/javascript">' . "\n"
+            . '//<![CDATA[' . "\n"
+            . 'var $body = $("body");' . "\n"
+            . '$("#textSQLDUMP")' . "\n"
+            . '.width($body.width() - 50)' . "\n"
+            . '.height($body.height() - 100);' . "\n"
+            . '//]]>' . "\n"
+            . '</script>' . "\n";
+    }
+
+    /**
+     * Computes the memory limit for export
+     *
+     * @return int the memory limit
+     */
+    public function getMemoryLimit(): int
+    {
+        $memory_limit = trim(ini_get('memory_limit'));
+        $memory_limit_num = (int) substr($memory_limit, 0, -1);
+        $lowerLastChar = strtolower(substr($memory_limit, -1));
+        // 2 MB as default
+        if (empty($memory_limit) || '-1' == $memory_limit) {
+            $memory_limit = 2 * 1024 * 1024;
+        } elseif ($lowerLastChar == 'm') {
+            $memory_limit = $memory_limit_num * 1024 * 1024;
+        } elseif ($lowerLastChar == 'k') {
+            $memory_limit = $memory_limit_num * 1024;
+        } elseif ($lowerLastChar == 'g') {
+            $memory_limit = $memory_limit_num * 1024 * 1024 * 1024;
+        } else {
+            $memory_limit = (int) $memory_limit;
+        }
+
+        // Some of memory is needed for other things and as threshold.
+        // During export I had allocated (see memory_get_usage function)
+        // approx 1.2MB so this comes from that.
+        if ($memory_limit > 1500000) {
+            $memory_limit -= 1500000;
+        }
+
+        // Some memory is needed for compression, assume 1/3
+        $memory_limit /= 8;
+        return $memory_limit;
+    }
+
+    /**
+     * Return the filename and MIME type for export file
+     *
+     * @param string       $export_type       type of export
+     * @param string       $remember_template whether to remember template
+     * @param ExportPlugin $export_plugin     the export plugin
+     * @param string       $compression       compression asked
+     * @param string       $filename_template the filename template
+     *
+     * @return string[] the filename template and mime type
+     */
+    public function getFilenameAndMimetype(
+        string $export_type,
+        string $remember_template,
+        ExportPlugin $export_plugin,
+        string $compression,
+        string $filename_template
+    ): array {
+        if ($export_type == 'server') {
+            if (! empty($remember_template)) {
+                $GLOBALS['PMA_Config']->setUserValue(
+                    'pma_server_filename_template',
+                    'Export/file_template_server',
+                    $filename_template
+                );
+            }
+        } elseif ($export_type == 'database') {
+            if (! empty($remember_template)) {
+                $GLOBALS['PMA_Config']->setUserValue(
+                    'pma_db_filename_template',
+                    'Export/file_template_database',
+                    $filename_template
+                );
+            }
+        } else {
+            if (! empty($remember_template)) {
+                $GLOBALS['PMA_Config']->setUserValue(
+                    'pma_table_filename_template',
+                    'Export/file_template_table',
+                    $filename_template
+                );
+            }
+        }
+        $filename = Util::expandUserString($filename_template);
+        // remove dots in filename (coming from either the template or already
+        // part of the filename) to avoid a remote code execution vulnerability
+        $filename = Sanitize::sanitizeFilename($filename, $replaceDots = true);
+
+        // Grab basic dump extension and mime type
+        // Check if the user already added extension;
+        // get the substring where the extension would be if it was included
+        $extension_start_pos = mb_strlen($filename) - mb_strlen(
+            $export_plugin->getProperties()->getExtension()
+        ) - 1;
+        $user_extension = mb_substr(
+            $filename,
+            $extension_start_pos,
+            mb_strlen($filename)
+        );
+        $required_extension = "." . $export_plugin->getProperties()->getExtension();
+        if (mb_strtolower($user_extension) != $required_extension) {
+            $filename  .= $required_extension;
+        }
+        $mime_type  = $export_plugin->getProperties()->getMimeType();
+
+        // If dump is going to be compressed, set correct mime_type and add
+        // compression to extension
+        if ($compression == 'gzip') {
+            $filename  .= '.gz';
+            $mime_type = 'application/x-gzip';
+        } elseif ($compression == 'zip') {
+            $filename  .= '.zip';
+            $mime_type = 'application/zip';
+        }
+        return [
+            $filename,
+            $mime_type,
+        ];
+    }
+
+    /**
+     * Open the export file
+     *
+     * @param string  $filename     the export filename
+     * @param boolean $quick_export whether it's a quick export or not
+     *
+     * @return array the full save filename, possible message and the file handle
+     */
+    public function openFile(string $filename, bool $quick_export): array
+    {
+        $file_handle = null;
+        $message = '';
+        $doNotSaveItOver = true;
+
+        if (isset($_POST['quick_export_onserver_overwrite'])) {
+            $doNotSaveItOver = $_POST['quick_export_onserver_overwrite'] != 'saveitover';
+        }
+
+        $save_filename = Util::userDir($GLOBALS['cfg']['SaveDir'])
+            . preg_replace('@[/\\\\]@', '_', $filename);
+
+        if (@file_exists($save_filename)
+            && ((! $quick_export && empty($_POST['onserver_overwrite']))
+            || ($quick_export
+            && $doNotSaveItOver))
+        ) {
+            $message = Message::error(
+                __(
+                    'File %s already exists on server, '
+                    . 'change filename or check overwrite option.'
+                )
+            );
+            $message->addParam($save_filename);
+        } elseif (@is_file($save_filename) && ! @is_writable($save_filename)) {
+            $message = Message::error(
+                __(
+                    'The web server does not have permission '
+                    . 'to save the file %s.'
+                )
+            );
+            $message->addParam($save_filename);
+        } elseif (! $file_handle = @fopen($save_filename, 'w')) {
+            $message = Message::error(
+                __(
+                    'The web server does not have permission '
+                    . 'to save the file %s.'
+                )
+            );
+            $message->addParam($save_filename);
+        }
+        return [
+            $save_filename,
+            $message,
+            $file_handle,
+        ];
+    }
+
+    /**
+     * Close the export file
+     *
+     * @param resource $file_handle   the export file handle
+     * @param string   $dump_buffer   the current dump buffer
+     * @param string   $save_filename the export filename
+     *
+     * @return Message a message object (or empty string)
+     */
+    public function closeFile(
+        $file_handle,
+        string $dump_buffer,
+        string $save_filename
+    ): Message {
+        $write_result = @fwrite($file_handle, $dump_buffer);
+        fclose($file_handle);
+        // Here, use strlen rather than mb_strlen to get the length
+        // in bytes to compare against the number of bytes written.
+        if (strlen($dump_buffer) > 0
+            && (! $write_result || $write_result != strlen($dump_buffer))
+        ) {
+            $message = new Message(
+                __('Insufficient space to save the file %s.'),
+                Message::ERROR,
+                [$save_filename]
+            );
+        } else {
+            $message = new Message(
+                __('Dump has been saved to file %s.'),
+                Message::SUCCESS,
+                [$save_filename]
+            );
+        }
+        return $message;
+    }
+
+    /**
+     * Compress the export buffer
+     *
+     * @param array|string $dump_buffer the current dump buffer
+     * @param string       $compression the compression mode
+     * @param string       $filename    the filename
+     *
+     * @return array|string|bool
+     */
+    public function compress($dump_buffer, string $compression, string $filename)
+    {
+        if ($compression == 'zip' && function_exists('gzcompress')) {
+            $zipExtension = new ZipExtension();
+            $filename = substr($filename, 0, -4); // remove extension (.zip)
+            $dump_buffer = $zipExtension->createFile($dump_buffer, $filename);
+        } elseif ($compression == 'gzip' && $this->gzencodeNeeded()) {
+            // without the optional parameter level because it bugs
+            $dump_buffer = gzencode($dump_buffer);
+        }
+        return $dump_buffer;
+    }
+
+    /**
+     * Saves the dump_buffer for a particular table in an array
+     * Used in separate files export
+     *
+     * @param string  $object_name the name of current object to be stored
+     * @param boolean $append      optional boolean to append to an existing index or not
+     *
+     * @return void
+     */
+    public function saveObjectInBuffer(string $object_name, bool $append = false): void
+    {
+        global $dump_buffer_objects, $dump_buffer, $dump_buffer_len;
+
+        if (! empty($dump_buffer)) {
+            if ($append && isset($dump_buffer_objects[$object_name])) {
+                $dump_buffer_objects[$object_name] .= $dump_buffer;
+            } else {
+                $dump_buffer_objects[$object_name] = $dump_buffer;
+            }
+        }
+
+        // Re - initialize
+        $dump_buffer = '';
+        $dump_buffer_len = 0;
+    }
+
+    /**
+     * Returns HTML containing the header for a displayed export
+     *
+     * @param string $export_type the export type
+     * @param string $db          the database name
+     * @param string $table       the table name
+     *
+     * @return string[] the generated HTML and back button
+     */
+    public function getHtmlForDisplayedExportHeader(
+        string $export_type,
+        string $db,
+        string $table
+    ): array {
+        $html = '<div>';
+
+        /**
+         * Displays a back button with all the $_POST data in the URL
+         * (store in a variable to also display after the textarea)
+         */
+        $back_button = '<p id="export_back_button">[ <a href="';
+        if ($export_type == 'server') {
+            $back_button .= 'server_export.php" data-post="' . Url::getCommon([], '');
+        } elseif ($export_type == 'database') {
+            $back_button .= 'db_export.php" data-post="' . Url::getCommon(['db' => $db], '');
+        } else {
+            $back_button .= 'tbl_export.php" data-post="' . Url::getCommon(
+                [
+                    'db' => $db,
+                    'table' => $table,
+                ],
+                ''
+            );
+        }
+
+        // Convert the multiple select elements from an array to a string
+        if ($export_type == 'database') {
+            $structOrDataForced = empty($_POST['structure_or_data_forced']);
+            if ($structOrDataForced && ! isset($_POST['table_structure'])) {
+                $_POST['table_structure'] = [];
+            }
+            if ($structOrDataForced && ! isset($_POST['table_data'])) {
+                $_POST['table_data'] = [];
+            }
+        }
+
+        foreach ($_POST as $name => $value) {
+            if (! is_array($value)) {
+                $back_button .= '&amp;' . urlencode((string) $name) . '=' . urlencode((string) $value);
+            }
+        }
+        $back_button .= '&amp;repopulate=1">' . __('Back') . '</a> ]</p>';
+        $html .= '<br>';
+        $html .= $back_button;
+        $refreshButton = '<form id="export_refresh_form" method="POST" action="export.php" class="disableAjax">';
+        $refreshButton .= '[ <a class="disableAjax" onclick="$(this).parent().submit()">' . __('Refresh') . '</a> ]';
+        foreach ($_POST as $name => $value) {
+            if (is_array($value)) {
+                foreach ($value as $val) {
+                    $refreshButton .= '<input type="hidden" name="' . htmlentities((string) $name) . '[]" value="' . htmlentities((string) $val) . '">';
+                }
+            } else {
+                $refreshButton .= '<input type="hidden" name="' . htmlentities((string) $name) . '" value="' . htmlentities((string) $value) . '">';
+            }
+        }
+        $refreshButton .= '</form>';
+        $html .= $refreshButton
+            . '<br>'
+            . '<form name="nofunction">'
+            . '<textarea name="sqldump" cols="50" rows="30" '
+            . 'id="textSQLDUMP" wrap="OFF">';
+
+        return [
+            $html,
+            $back_button,
+            $refreshButton,
+        ];
+    }
+
+    /**
+     * Export at the server level
+     *
+     * @param string|array $db_select       the selected databases to export
+     * @param string       $whatStrucOrData structure or data or both
+     * @param ExportPlugin $export_plugin   the selected export plugin
+     * @param string       $crlf            end of line character(s)
+     * @param string       $err_url         the URL in case of error
+     * @param string       $export_type     the export type
+     * @param bool         $do_relation     whether to export relation info
+     * @param bool         $do_comments     whether to add comments
+     * @param bool         $do_mime         whether to add MIME info
+     * @param bool         $do_dates        whether to add dates
+     * @param array        $aliases         alias information for db/table/column
+     * @param string       $separate_files  whether it is a separate-files export
+     *
+     * @return void
+     */
+    public function exportServer(
+        $db_select,
+        string $whatStrucOrData,
+        ExportPlugin $export_plugin,
+        string $crlf,
+        string $err_url,
+        string $export_type,
+        bool $do_relation,
+        bool $do_comments,
+        bool $do_mime,
+        bool $do_dates,
+        array $aliases,
+        string $separate_files
+    ): void {
+        if (! empty($db_select)) {
+            $tmp_select = implode($db_select, '|');
+            $tmp_select = '|' . $tmp_select . '|';
+        }
+        // Walk over databases
+        foreach ($GLOBALS['dblist']->databases as $current_db) {
+            if (isset($tmp_select)
+                && mb_strpos(' ' . $tmp_select, '|' . $current_db . '|')
+            ) {
+                $tables = $this->dbi->getTables($current_db);
+                $this->exportDatabase(
+                    $current_db,
+                    $tables,
+                    $whatStrucOrData,
+                    $tables,
+                    $tables,
+                    $export_plugin,
+                    $crlf,
+                    $err_url,
+                    $export_type,
+                    $do_relation,
+                    $do_comments,
+                    $do_mime,
+                    $do_dates,
+                    $aliases,
+                    $separate_files == 'database' ? $separate_files : ''
+                );
+                if ($separate_files == 'server') {
+                    $this->saveObjectInBuffer($current_db);
+                }
+            }
+        } // end foreach database
+    }
+
+    /**
+     * Export at the database level
+     *
+     * @param string       $db              the database to export
+     * @param array        $tables          the tables to export
+     * @param string       $whatStrucOrData structure or data or both
+     * @param array        $table_structure whether to export structure for each table
+     * @param array        $table_data      whether to export data for each table
+     * @param ExportPlugin $export_plugin   the selected export plugin
+     * @param string       $crlf            end of line character(s)
+     * @param string       $err_url         the URL in case of error
+     * @param string       $export_type     the export type
+     * @param bool         $do_relation     whether to export relation info
+     * @param bool         $do_comments     whether to add comments
+     * @param bool         $do_mime         whether to add MIME info
+     * @param bool         $do_dates        whether to add dates
+     * @param array        $aliases         Alias information for db/table/column
+     * @param string       $separate_files  whether it is a separate-files export
+     *
+     * @return void
+     */
+    public function exportDatabase(
+        string $db,
+        array $tables,
+        string $whatStrucOrData,
+        array $table_structure,
+        array $table_data,
+        ExportPlugin $export_plugin,
+        string $crlf,
+        string $err_url,
+        string $export_type,
+        bool $do_relation,
+        bool $do_comments,
+        bool $do_mime,
+        bool $do_dates,
+        array $aliases,
+        string $separate_files
+    ): void {
+        $db_alias = ! empty($aliases[$db]['alias'])
+            ? $aliases[$db]['alias'] : '';
+
+        if (! $export_plugin->exportDBHeader($db, $db_alias)) {
+            return;
+        }
+        if (! $export_plugin->exportDBCreate($db, $export_type, $db_alias)) {
+            return;
+        }
+        if ($separate_files == 'database') {
+            $this->saveObjectInBuffer('database', true);
+        }
+
+        if (($GLOBALS['sql_structure_or_data'] == 'structure'
+            || $GLOBALS['sql_structure_or_data'] == 'structure_and_data')
+            && isset($GLOBALS['sql_procedure_function'])
+        ) {
+            $export_plugin->exportRoutines($db, $aliases);
+
+            if ($separate_files == 'database') {
+                $this->saveObjectInBuffer('routines');
+            }
+        }
+
+        $views = [];
+
+        foreach ($tables as $table) {
+            $_table = new Table($table, $db);
+            // if this is a view, collect it for later;
+            // views must be exported after the tables
+            $is_view = $_table->isView();
+            if ($is_view) {
+                $views[] = $table;
+            }
+            if (($whatStrucOrData == 'structure'
+                || $whatStrucOrData == 'structure_and_data')
+                && in_array($table, $table_structure)
+            ) {
+                // for a view, export a stand-in definition of the table
+                // to resolve view dependencies (only when it's a single-file export)
+                if ($is_view) {
+                    if ($separate_files == ''
+                        && isset($GLOBALS['sql_create_view'])
+                        && ! $export_plugin->exportStructure(
+                            $db,
+                            $table,
+                            $crlf,
+                            $err_url,
+                            'stand_in',
+                            $export_type,
+                            $do_relation,
+                            $do_comments,
+                            $do_mime,
+                            $do_dates,
+                            $aliases
+                        )
+                    ) {
+                        break;
+                    }
+                } elseif (isset($GLOBALS['sql_create_table'])) {
+                    $table_size = $GLOBALS['maxsize'];
+                    // Checking if the maximum table size constrain has been set
+                    // And if that constrain is a valid number or not
+                    if ($table_size !== '' && is_numeric($table_size)) {
+                        // This obtains the current table's size
+                        $query = 'SELECT data_length + index_length
+                              from information_schema.TABLES
+                              WHERE table_schema = "' . $this->dbi->escapeString($db) . '"
+                              AND table_name = "' . $this->dbi->escapeString($table) . '"';
+
+                        $size = $this->dbi->fetchValue($query);
+                        //Converting the size to MB
+                        $size = ($size / 1024) / 1024;
+                        if ($size > $table_size) {
+                            continue;
+                        }
+                    }
+
+                    if (! $export_plugin->exportStructure(
+                        $db,
+                        $table,
+                        $crlf,
+                        $err_url,
+                        'create_table',
+                        $export_type,
+                        $do_relation,
+                        $do_comments,
+                        $do_mime,
+                        $do_dates,
+                        $aliases
+                    )) {
+                        break;
+                    }
+                }
+            }
+            // if this is a view or a merge table, don't export data
+            if (($whatStrucOrData == 'data' || $whatStrucOrData == 'structure_and_data')
+                && in_array($table, $table_data)
+                && ! $is_view
+            ) {
+                $tableObj = new Table($table, $db);
+                $nonGeneratedCols = $tableObj->getNonGeneratedColumns(true);
+
+                $local_query  = 'SELECT ' . implode(', ', $nonGeneratedCols)
+                    . ' FROM ' . Util::backquote($db)
+                    . '.' . Util::backquote($table);
+
+                if (! $export_plugin->exportData(
+                    $db,
+                    $table,
+                    $crlf,
+                    $err_url,
+                    $local_query,
+                    $aliases
+                )) {
+                    break;
+                }
+            }
+
+            // this buffer was filled, we save it and go to the next one
+            if ($separate_files == 'database') {
+                $this->saveObjectInBuffer('table_' . $table);
+            }
+
+            // now export the triggers (needs to be done after the data because
+            // triggers can modify already imported tables)
+            if (isset($GLOBALS['sql_create_trigger']) && ($whatStrucOrData == 'structure'
+                || $whatStrucOrData == 'structure_and_data')
+                && in_array($table, $table_structure)
+            ) {
+                if (! $export_plugin->exportStructure(
+                    $db,
+                    $table,
+                    $crlf,
+                    $err_url,
+                    'triggers',
+                    $export_type,
+                    $do_relation,
+                    $do_comments,
+                    $do_mime,
+                    $do_dates,
+                    $aliases
+                )) {
+                    break;
+                }
+
+                if ($separate_files == 'database') {
+                    $this->saveObjectInBuffer('table_' . $table, true);
+                }
+            }
+        }
+
+        if (isset($GLOBALS['sql_create_view'])) {
+            foreach ($views as $view) {
+                // no data export for a view
+                if ($whatStrucOrData == 'structure'
+                    || $whatStrucOrData == 'structure_and_data'
+                ) {
+                    if (! $export_plugin->exportStructure(
+                        $db,
+                        $view,
+                        $crlf,
+                        $err_url,
+                        'create_view',
+                        $export_type,
+                        $do_relation,
+                        $do_comments,
+                        $do_mime,
+                        $do_dates,
+                        $aliases
+                    )) {
+                        break;
+                    }
+
+                    if ($separate_files == 'database') {
+                        $this->saveObjectInBuffer('view_' . $view);
+                    }
+                }
+            }
+        }
+
+        if (! $export_plugin->exportDBFooter($db)) {
+            return;
+        }
+
+        // export metadata related to this db
+        if (isset($GLOBALS['sql_metadata'])) {
+            // Types of metadata to export.
+            // In the future these can be allowed to be selected by the user
+            $metadataTypes = $this->getMetadataTypes();
+            $export_plugin->exportMetadata($db, $tables, $metadataTypes);
+
+            if ($separate_files == 'database') {
+                $this->saveObjectInBuffer('metadata');
+            }
+        }
+
+        if ($separate_files == 'database') {
+            $this->saveObjectInBuffer('extra');
+        }
+
+        if (($GLOBALS['sql_structure_or_data'] == 'structure'
+            || $GLOBALS['sql_structure_or_data'] == 'structure_and_data')
+            && isset($GLOBALS['sql_procedure_function'])
+        ) {
+            $export_plugin->exportEvents($db);
+
+            if ($separate_files == 'database') {
+                $this->saveObjectInBuffer('events');
+            }
+        }
+    }
+
+    /**
+     * Export at the table level
+     *
+     * @param string       $db              the database to export
+     * @param string       $table           the table to export
+     * @param string       $whatStrucOrData structure or data or both
+     * @param ExportPlugin $export_plugin   the selected export plugin
+     * @param string       $crlf            end of line character(s)
+     * @param string       $err_url         the URL in case of error
+     * @param string       $export_type     the export type
+     * @param bool         $do_relation     whether to export relation info
+     * @param bool         $do_comments     whether to add comments
+     * @param bool         $do_mime         whether to add MIME info
+     * @param bool         $do_dates        whether to add dates
+     * @param string|null  $allrows         whether "dump all rows" was ticked
+     * @param string       $limit_to        upper limit
+     * @param string       $limit_from      starting limit
+     * @param string       $sql_query       query for which exporting is requested
+     * @param array        $aliases         Alias information for db/table/column
+     *
+     * @return void
+     */
+    public function exportTable(
+        string $db,
+        string $table,
+        string $whatStrucOrData,
+        ExportPlugin $export_plugin,
+        string $crlf,
+        string $err_url,
+        string $export_type,
+        bool $do_relation,
+        bool $do_comments,
+        bool $do_mime,
+        bool $do_dates,
+        ?string $allrows,
+        string $limit_to,
+        string $limit_from,
+        string $sql_query,
+        array $aliases
+    ): void {
+        $db_alias = ! empty($aliases[$db]['alias'])
+            ? $aliases[$db]['alias'] : '';
+        if (! $export_plugin->exportDBHeader($db, $db_alias)) {
+            return;
+        }
+        if (isset($allrows)
+            && $allrows == '0'
+            && $limit_to > 0
+            && $limit_from >= 0
+        ) {
+            $add_query  = ' LIMIT '
+                        . ($limit_from > 0 ? $limit_from . ', ' : '')
+                        . $limit_to;
+        } else {
+            $add_query  = '';
+        }
+
+        $_table = new Table($table, $db);
+        $is_view = $_table->isView();
+        if ($whatStrucOrData == 'structure'
+            || $whatStrucOrData == 'structure_and_data'
+        ) {
+            if ($is_view) {
+                if (isset($GLOBALS['sql_create_view'])) {
+                    if (! $export_plugin->exportStructure(
+                        $db,
+                        $table,
+                        $crlf,
+                        $err_url,
+                        'create_view',
+                        $export_type,
+                        $do_relation,
+                        $do_comments,
+                        $do_mime,
+                        $do_dates,
+                        $aliases
+                    )) {
+                        return;
+                    }
+                }
+            } elseif (isset($GLOBALS['sql_create_table'])) {
+                if (! $export_plugin->exportStructure(
+                    $db,
+                    $table,
+                    $crlf,
+                    $err_url,
+                    'create_table',
+                    $export_type,
+                    $do_relation,
+                    $do_comments,
+                    $do_mime,
+                    $do_dates,
+                    $aliases
+                )) {
+                    return;
+                }
+            }
+        }
+        // If this is an export of a single view, we have to export data;
+        // for example, a PDF report
+        // if it is a merge table, no data is exported
+        if ($whatStrucOrData == 'data'
+            || $whatStrucOrData == 'structure_and_data'
+        ) {
+            if (! empty($sql_query)) {
+                // only preg_replace if needed
+                if (! empty($add_query)) {
+                    // remove trailing semicolon before adding a LIMIT
+                    $sql_query = preg_replace('%;\s*$%', '', $sql_query);
+                }
+                $local_query = $sql_query . $add_query;
+                $this->dbi->selectDb($db);
+            } else {
+                // Data is exported only for Non-generated columns
+                $tableObj = new Table($table, $db);
+                $nonGeneratedCols = $tableObj->getNonGeneratedColumns(true);
+
+                $local_query  = 'SELECT ' . implode(', ', $nonGeneratedCols)
+                    . ' FROM ' . Util::backquote($db)
+                    . '.' . Util::backquote($table) . $add_query;
+            }
+            if (! $export_plugin->exportData(
+                $db,
+                $table,
+                $crlf,
+                $err_url,
+                $local_query,
+                $aliases
+            )) {
+                return;
+            }
+        }
+        // now export the triggers (needs to be done after the data because
+        // triggers can modify already imported tables)
+        if (isset($GLOBALS['sql_create_trigger']) && ($whatStrucOrData == 'structure'
+            || $whatStrucOrData == 'structure_and_data')
+        ) {
+            if (! $export_plugin->exportStructure(
+                $db,
+                $table,
+                $crlf,
+                $err_url,
+                'triggers',
+                $export_type,
+                $do_relation,
+                $do_comments,
+                $do_mime,
+                $do_dates,
+                $aliases
+            )) {
+                return;
+            }
+        }
+        if (! $export_plugin->exportDBFooter($db)) {
+            return;
+        }
+
+        if (isset($GLOBALS['sql_metadata'])) {
+            // Types of metadata to export.
+            // In the future these can be allowed to be selected by the user
+            $metadataTypes = $this->getMetadataTypes();
+            $export_plugin->exportMetadata($db, $table, $metadataTypes);
+        }
+    }
+
+    /**
+     * Loads correct page after doing export
+     *
+     * @param string $db          the database name
+     * @param string $table       the table name
+     * @param string $export_type Export type
+     *
+     * @return void
+     */
+    public function showPage(string $db, string $table, string $export_type): void
+    {
+        global $cfg;
+        if ($export_type == 'server') {
+            $active_page = 'server_export.php';
+            include_once ROOT_PATH . 'server_export.php';
+        } elseif ($export_type == 'database') {
+            $active_page = 'db_export.php';
+            include_once ROOT_PATH . 'db_export.php';
+        } else {
+            $active_page = 'tbl_export.php';
+            include_once ROOT_PATH . 'tbl_export.php';
+        }
+        exit;
+    }
+
+    /**
+     * Merge two alias arrays, if array1 and array2 have
+     * conflicting alias then array2 value is used if it
+     * is non empty otherwise array1 value.
+     *
+     * @param array $aliases1 first array of aliases
+     * @param array $aliases2 second array of aliases
+     *
+     * @return array resultant merged aliases info
+     */
+    public function mergeAliases(array $aliases1, array $aliases2): array
+    {
+        // First do a recursive array merge
+        // on aliases arrays.
+        $aliases = array_merge_recursive($aliases1, $aliases2);
+        // Now, resolve conflicts in aliases, if any
+        foreach ($aliases as $db_name => $db) {
+            // If alias key is an array then
+            // it is a merge conflict.
+            if (isset($db['alias']) && is_array($db['alias'])) {
+                $val1 = $db['alias'][0];
+                $val2 = $db['alias'][1];
+                // Use aliases2 alias if non empty
+                $aliases[$db_name]['alias']
+                    = empty($val2) ? $val1 : $val2;
+            }
+            if (! isset($db['tables'])) {
+                continue;
+            }
+            foreach ($db['tables'] as $tbl_name => $tbl) {
+                if (isset($tbl['alias']) && is_array($tbl['alias'])) {
+                    $val1 = $tbl['alias'][0];
+                    $val2 = $tbl['alias'][1];
+                    // Use aliases2 alias if non empty
+                    $aliases[$db_name]['tables'][$tbl_name]['alias']
+                        = empty($val2) ? $val1 : $val2;
+                }
+                if (! isset($tbl['columns'])) {
+                    continue;
+                }
+                foreach ($tbl['columns'] as $col => $col_as) {
+                    if (isset($col_as) && is_array($col_as)) {
+                        $val1 = $col_as[0];
+                        $val2 = $col_as[1];
+                        // Use aliases2 alias if non empty
+                        $aliases[$db_name]['tables'][$tbl_name]['columns'][$col]
+                            = empty($val2) ? $val1 : $val2;
+                    }
+                }
+            }
+        }
+        return $aliases;
+    }
+
+    /**
+     * Locks tables
+     *
+     * @param string $db       database name
+     * @param array  $tables   list of table names
+     * @param string $lockType lock type; "[LOW_PRIORITY] WRITE" or "READ [LOCAL]"
+     *
+     * @return mixed result of the query
+     */
+    public function lockTables(string $db, array $tables, string $lockType = "WRITE")
+    {
+        $locks = [];
+        foreach ($tables as $table) {
+            $locks[] = Util::backquote($db) . "."
+                . Util::backquote($table) . " " . $lockType;
+        }
+
+        $sql = "LOCK TABLES " . implode(", ", $locks);
+        return $this->dbi->tryQuery($sql);
+    }
+
+    /**
+     * Releases table locks
+     *
+     * @return mixed result of the query
+     */
+    public function unlockTables()
+    {
+        return $this->dbi->tryQuery("UNLOCK TABLES");
+    }
+
+    /**
+     * Returns all the metadata types that can be exported with a database or a table
+     *
+     * @return string[] metadata types.
+     */
+    public function getMetadataTypes(): array
+    {
+        return [
+            'column_info',
+            'table_uiprefs',
+            'tracking',
+            'bookmark',
+            'relation',
+            'table_coords',
+            'pdf_pages',
+            'savedsearches',
+            'central_columns',
+            'export_templates',
+        ];
+    }
+
+    /**
+     * Returns the checked clause, depending on the presence of key in array
+     *
+     * @param string $key   the key to look for
+     * @param array  $array array to verify
+     *
+     * @return string the checked clause
+     */
+    public function getCheckedClause(string $key, array $array): string
+    {
+        if (in_array($key, $array)) {
+            return ' checked="checked"';
+        }
+
+        return '';
+    }
+
+    /**
+     * get all the export options and verify
+     * call and include the appropriate Schema Class depending on $export_type
+     *
+     * @param string|null $export_type format of the export
+     *
+     * @return void
+     */
+    public function processExportSchema(?string $export_type): void
+    {
+        /**
+         * default is PDF, otherwise validate it's only letters a-z
+         */
+        if (! isset($export_type) || ! preg_match('/^[a-zA-Z]+$/', $export_type)) {
+            $export_type = 'pdf';
+        }
+
+        // sanitize this parameter which will be used below in a file inclusion
+        $export_type = Core::securePath($export_type);
+
+        // get the specific plugin
+        /** @var SchemaPlugin $export_plugin */
+        $export_plugin = Plugins::getPlugin(
+            "schema",
+            $export_type,
+            'libraries/classes/Plugins/Schema/'
+        );
+
+        // Check schema export type
+        if ($export_plugin === null || ! is_object($export_plugin)) {
+            Core::fatalError(__('Bad type!'));
+        }
+
+        $this->dbi->selectDb($_POST['db']);
+        $export_plugin->exportSchema($_POST['db']);
+    }
+}