includes/export/abstract-wc-csv-exporter.php
<?php
/**
* Handles CSV export.
*
* @package WooCommerce\Export
* @version 3.1.0
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* WC_CSV_Exporter Class.
*/
abstract class WC_CSV_Exporter {
/**
* Type of export used in filter names.
*
* @var string
*/
protected $export_type = '';
/**
* Filename to export to.
*
* @var string
*/
protected $filename = 'wc-export.csv';
/**
* Batch limit.
*
* @var integer
*/
protected $limit = 50;
/**
* Number exported.
*
* @var integer
*/
protected $exported_row_count = 0;
/**
* Raw data to export.
*
* @var array
*/
protected $row_data = array();
/**
* Total rows to export.
*
* @var integer
*/
protected $total_rows = 0;
/**
* Columns ids and names.
*
* @var array
*/
protected $column_names = array();
/**
* List of columns to export, or empty for all.
*
* @var array
*/
protected $columns_to_export = array();
/**
* The delimiter parameter sets the field delimiter (one character only).
*
* @var string
*/
protected $delimiter = ',';
/**
* Prepare data that will be exported.
*/
abstract public function prepare_data_to_export();
/**
* Return an array of supported column names and ids.
*
* @since 3.1.0
* @return array
*/
public function get_column_names() {
return apply_filters( "woocommerce_{$this->export_type}_export_column_names", $this->column_names, $this );
}
/**
* Set column names.
*
* @since 3.1.0
* @param array $column_names Column names array.
*/
public function set_column_names( $column_names ) {
$this->column_names = array();
foreach ( $column_names as $column_id => $column_name ) {
$this->column_names[ wc_clean( $column_id ) ] = wc_clean( $column_name );
}
}
/**
* Return an array of columns to export.
*
* @since 3.1.0
* @return array
*/
public function get_columns_to_export() {
return $this->columns_to_export;
}
/**
* Return the delimiter to use in CSV file
*
* @since 3.9.0
* @return string
*/
public function get_delimiter() {
return apply_filters( "woocommerce_{$this->export_type}_export_delimiter", $this->delimiter );
}
/**
* Set columns to export.
*
* @since 3.1.0
* @param array $columns Columns array.
*/
public function set_columns_to_export( $columns ) {
$this->columns_to_export = array_map( 'wc_clean', $columns );
}
/**
* See if a column is to be exported or not.
*
* @since 3.1.0
* @param string $column_id ID of the column being exported.
* @return boolean
*/
public function is_column_exporting( $column_id ) {
$column_id = strstr( $column_id, ':' ) ? current( explode( ':', $column_id ) ) : $column_id;
$columns_to_export = $this->get_columns_to_export();
if ( empty( $columns_to_export ) ) {
return true;
}
if ( in_array( $column_id, $columns_to_export, true ) || 'meta' === $column_id ) {
return true;
}
return false;
}
/**
* Return default columns.
*
* @since 3.1.0
* @return array
*/
public function get_default_column_names() {
return array();
}
/**
* Do the export.
*
* @since 3.1.0
*/
public function export() {
$this->prepare_data_to_export();
$this->send_headers();
$this->send_content( chr( 239 ) . chr( 187 ) . chr( 191 ) . $this->export_column_headers() . $this->get_csv_data() );
die();
}
/**
* Set the export headers.
*
* @since 3.1.0
*/
public function send_headers() {
if ( function_exists( 'gc_enable' ) ) {
gc_enable(); // phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.gc_enableFound
}
if ( function_exists( 'apache_setenv' ) ) {
@apache_setenv( 'no-gzip', 1 ); // @codingStandardsIgnoreLine
}
@ini_set( 'zlib.output_compression', 'Off' ); // @codingStandardsIgnoreLine
@ini_set( 'output_buffering', 'Off' ); // @codingStandardsIgnoreLine
@ini_set( 'output_handler', '' ); // @codingStandardsIgnoreLine
ignore_user_abort( true );
wc_set_time_limit( 0 );
wc_nocache_headers();
header( 'Content-Type: text/csv; charset=utf-8' );
header( 'Content-Disposition: attachment; filename=' . $this->get_filename() );
header( 'Pragma: no-cache' );
header( 'Expires: 0' );
}
/**
* Set filename to export to.
*
* @param string $filename Filename to export to.
*/
public function set_filename( $filename ) {
$this->filename = sanitize_file_name( str_replace( '.csv', '', $filename ) . '.csv' );
}
/**
* Generate and return a filename.
*
* @return string
*/
public function get_filename() {
return sanitize_file_name( apply_filters( "woocommerce_{$this->export_type}_export_get_filename", $this->filename ) );
}
/**
* Set the export content.
*
* @since 3.1.0
* @param string $csv_data All CSV content.
*/
public function send_content( $csv_data ) {
echo $csv_data; // @codingStandardsIgnoreLine
}
/**
* Get CSV data for this export.
*
* @since 3.1.0
* @return string
*/
protected function get_csv_data() {
return $this->export_rows();
}
/**
* Export column headers in CSV format.
*
* @since 3.1.0
* @return string
*/
protected function export_column_headers() {
$columns = $this->get_column_names();
$export_row = array();
$buffer = fopen( 'php://output', 'w' ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fopen
ob_start();
foreach ( $columns as $column_id => $column_name ) {
if ( ! $this->is_column_exporting( $column_id ) ) {
continue;
}
$export_row[] = $this->format_data( $column_name );
}
$this->fputcsv( $buffer, $export_row );
return ob_get_clean();
}
/**
* Get data that will be exported.
*
* @since 3.1.0
* @return array
*/
protected function get_data_to_export() {
return $this->row_data;
}
/**
* Export rows in CSV format.
*
* @since 3.1.0
* @return string
*/
protected function export_rows() {
$data = $this->get_data_to_export();
$buffer = fopen( 'php://output', 'w' ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fopen
ob_start();
array_walk( $data, array( $this, 'export_row' ), $buffer );
return apply_filters( "woocommerce_{$this->export_type}_export_rows", ob_get_clean(), $this );
}
/**
* Export rows to an array ready for the CSV.
*
* @since 3.1.0
* @param array $row_data Data to export.
* @param string $key Column being exported.
* @param resource $buffer Output buffer.
*/
protected function export_row( $row_data, $key, $buffer ) {
$columns = $this->get_column_names();
$export_row = array();
foreach ( $columns as $column_id => $column_name ) {
if ( ! $this->is_column_exporting( $column_id ) ) {
continue;
}
if ( isset( $row_data[ $column_id ] ) ) {
$export_row[] = $this->format_data( $row_data[ $column_id ] );
} else {
$export_row[] = '';
}
}
$this->fputcsv( $buffer, $export_row );
++ $this->exported_row_count;
}
/**
* Get batch limit.
*
* @since 3.1.0
* @return int
*/
public function get_limit() {
return apply_filters( "woocommerce_{$this->export_type}_export_batch_limit", $this->limit, $this );
}
/**
* Set batch limit.
*
* @since 3.1.0
* @param int $limit Limit to export.
*/
public function set_limit( $limit ) {
$this->limit = absint( $limit );
}
/**
* Get count of records exported.
*
* @since 3.1.0
* @return int
*/
public function get_total_exported() {
return $this->exported_row_count;
}
/**
* Escape a string to be used in a CSV context
*
* Malicious input can inject formulas into CSV files, opening up the possibility
* for phishing attacks and disclosure of sensitive information.
*
* Additionally, Excel exposes the ability to launch arbitrary commands through
* the DDE protocol.
*
* @see http://www.contextis.com/resources/blog/comma-separated-vulnerabilities/
* @see https://hackerone.com/reports/72785
*
* @since 3.1.0
* @param string $data CSV field to escape.
* @return string
*/
public function escape_data( $data ) {
$active_content_triggers = array( '=', '+', '-', '@' );
if ( in_array( mb_substr( $data, 0, 1 ), $active_content_triggers, true ) ) {
$data = "'" . $data;
}
return $data;
}
/**
* Format and escape data ready for the CSV file.
*
* @since 3.1.0
* @param string $data Data to format.
* @return string
*/
public function format_data( $data ) {
if ( ! is_scalar( $data ) ) {
if ( is_a( $data, 'WC_Datetime' ) ) {
$data = $data->date( 'Y-m-d G:i:s' );
} else {
$data = ''; // Not supported.
}
} elseif ( is_bool( $data ) ) {
$data = $data ? 1 : 0;
}
$use_mb = function_exists( 'mb_convert_encoding' );
if ( $use_mb ) {
$encoding = mb_detect_encoding( $data, 'UTF-8, ISO-8859-1', true );
$data = 'UTF-8' === $encoding ? $data : utf8_encode( $data );
}
return $this->escape_data( $data );
}
/**
* Format term ids to names.
*
* @since 3.1.0
* @param array $term_ids Term IDs to format.
* @param string $taxonomy Taxonomy name.
* @return string
*/
public function format_term_ids( $term_ids, $taxonomy ) {
$term_ids = wp_parse_id_list( $term_ids );
if ( ! count( $term_ids ) ) {
return '';
}
$formatted_terms = array();
if ( is_taxonomy_hierarchical( $taxonomy ) ) {
foreach ( $term_ids as $term_id ) {
$formatted_term = array();
$ancestor_ids = array_reverse( get_ancestors( $term_id, $taxonomy ) );
foreach ( $ancestor_ids as $ancestor_id ) {
$term = get_term( $ancestor_id, $taxonomy );
if ( $term && ! is_wp_error( $term ) ) {
$formatted_term[] = $term->name;
}
}
$term = get_term( $term_id, $taxonomy );
if ( $term && ! is_wp_error( $term ) ) {
$formatted_term[] = $term->name;
}
$formatted_terms[] = implode( ' > ', $formatted_term );
}
} else {
foreach ( $term_ids as $term_id ) {
$term = get_term( $term_id, $taxonomy );
if ( $term && ! is_wp_error( $term ) ) {
$formatted_terms[] = $term->name;
}
}
}
return $this->implode_values( $formatted_terms );
}
/**
* Implode CSV cell values using commas by default, and wrapping values
* which contain the separator.
*
* @since 3.2.0
* @param array $values Values to implode.
* @return string
*/
protected function implode_values( $values ) {
$values_to_implode = array();
foreach ( $values as $value ) {
$value = (string) is_scalar( $value ) ? $value : '';
$values_to_implode[] = str_replace( ',', '\\,', $value );
}
return implode( ', ', $values_to_implode );
}
/**
* Write to the CSV file, ensuring escaping works across versions of
* PHP.
*
* PHP 5.5.4 uses '\' as the default escape character. This is not RFC-4180 compliant.
* \0 disables the escape character.
*
* @see https://bugs.php.net/bug.php?id=43225
* @see https://bugs.php.net/bug.php?id=50686
* @see https://github.com/woocommerce/woocommerce/issues/19514
* @since 3.4.0
* @see https://github.com/woocommerce/woocommerce/issues/24579
* @since 3.9.0
* @param resource $buffer Resource we are writing to.
* @param array $export_row Row to export.
*/
protected function fputcsv( $buffer, $export_row ) {
if ( version_compare( PHP_VERSION, '5.5.4', '<' ) ) {
ob_start();
$temp = fopen( 'php://output', 'w' ); // @codingStandardsIgnoreLine
fputcsv( $temp, $export_row, $this->get_delimiter(), '"' ); // @codingStandardsIgnoreLine
fclose( $temp ); // @codingStandardsIgnoreLine
$row = ob_get_clean();
$row = str_replace( '\\"', '\\""', $row );
fwrite( $buffer, $row ); // @codingStandardsIgnoreLine
} else {
fputcsv( $buffer, $export_row, $this->get_delimiter(), '"', "\0" ); // @codingStandardsIgnoreLine
}
}
}