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Editing: dataformat.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Class containing utility methods for dataformats
 *
 * @package     core
 * @copyright   2020 Paul Holden <paulh@moodle.com>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core;

use coding_exception;
use core_php_time_limit;
use stored_file;

/**
 * Dataformat utility class
 *
 * @package     core
 * @copyright   2020 Paul Holden <paulh@moodle.com>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class dataformat {

/**
     * Return an instance of a dataformat writer from given dataformat type
     *
     * @param string $dataformat
     * @return dataformat\base
     * @throws coding_exception
     */
    protected static function get_format_instance(string $dataformat): \core\dataformat\base {
        $classname = 'dataformat_' . $dataformat . '\writer';
        if (!class_exists($classname)) {
            throw new coding_exception('Invalid dataformat', $dataformat);
        }

return new $classname();
    }

/**
     * Sends a formatted data file to the browser
     *
     * @param string $filename
     * @param string $dataformat
     * @param array $columns
     * @param Iterable $iterator
     * @param callable|null $callback Optional callback method to apply to each record prior to writing, which accepts two
     *      parameters as such: function($record, bool $supportshtml) returning formatted record
     * @throws coding_exception
     */
    public static function download_data(string $filename, string $dataformat, array $columns, Iterable $iterator,
            callable $callback = null): void {

if (ob_get_length()) {
            throw new coding_exception('Output can not be buffered before calling download_data()');
        }

$format = self::get_format_instance($dataformat);

// The data format export could take a while to generate.
        core_php_time_limit::raise();

// Close the session so that the users other tabs in the same session are not blocked.
        \core\session\manager::write_close();

// If this file was requested from a form, then mark download as complete (before sending headers).
        \core_form\util::form_download_complete();

$format->set_filename($filename);
        $format->send_http_headers();

$format->start_output();
        $format->start_sheet($columns);

$rownum = 0;
        foreach ($iterator as $row) {
            if (is_callable($callback)) {
                $row = $callback($row, $format->supports_html());
            }
            if ($row === null) {
                continue;
            }
            $format->write_record($row, $rownum++);
        }

$format->close_sheet($columns);
        $format->close_output();
    }

/**
     * Writes a formatted data file with specified filename
     *
     * @param string $filename
     * @param string $dataformat
     * @param array $columns
     * @param Iterable $iterator
     * @param callable|null $callback
     * @return string Complete path to the file on disk
     */
    public static function write_data(string $filename, string $dataformat, array $columns, Iterable $iterator,
            callable $callback = null): string {

$format = self::get_format_instance($dataformat);

// The data format export could take a while to generate.
        core_php_time_limit::raise();

// Close the session so that the users other tabs in the same session are not blocked.
        \core\session\manager::write_close();

$filepath = make_request_directory() . '/' . $filename . $format->get_extension();
        $format->set_filepath($filepath);

$format->start_output_to_file();
        $format->start_sheet($columns);

$format->close_sheet($columns);
        $format->close_output_to_file();

return $filepath;
    }

/**
     * Writes a formatted data file to file storage
     *
     * @param array $filerecord File record for storage, 'filename' extension should be omitted as it's added by the dataformat
     * @param string $dataformat
     * @param array $columns
     * @param Iterable $iterator Iterable set of records to write
     * @param callable|null $callback Optional callback method to apply to each record prior to writing
     * @return stored_file
     */
    public static function write_data_to_filearea(array $filerecord, string $dataformat, array $columns, Iterable $iterator,
            callable $callback = null): stored_file {

$filepath = self::write_data($filerecord['filename'], $dataformat, $columns, $iterator, $callback);

// Update filename of returned file record.
        $filerecord['filename'] = basename($filepath);

return get_file_storage()->create_file_from_pathname($filerecord, $filepath);
    }
}

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Editing: dataformat.php

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