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Editing: class-stream-handler.php

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<?php
namespace WP_Rocket\Logger;

use Monolog\Handler\StreamHandler;

defined( 'ABSPATH' ) || die( 'Cheatin&#8217; uh?' );

/**
 * Class used to log records into a local file.
 *
 * @since  3.2
 * @author Grégory Viguier
 */
class Stream_Handler extends StreamHandler {

/**
	 * Tell if the .htaccess file exists.
	 *
	 * @var    bool
	 * @since  3.2
	 * @access private
	 * @author Grégory Viguier
	 */
	private $htaccess_exists;

/**
	 * Tell if there is an error.
	 *
	 * @var    bool
	 * @since  3.2
	 * @access private
	 * @author Grégory Viguier
	 */
	private $has_error;

/**
	 * Contains an error message.
	 *
	 * @var    string
	 * @since  3.2
	 * @access private
	 * @author Grégory Viguier
	 */
	private $error_message;

/**
	 * Writes the record down to the log of the implementing handler.
	 *
	 * @since  3.2
	 * @access protected
	 * @author Grégory Viguier
	 *
	 * @param array $record Log contents.
	 */
	protected function write( array $record ) {
		parent::write( $record );
		$this->create_htaccess_file();
	}

/**
	 * Create a .htaccess file in the log folder, to prevent direct access and directory listing.
	 *
	 * @since  3.2
	 * @access protected
	 * @throws \UnexpectedValueException When the .htaccess file could not be created.
	 * @author Grégory Viguier
	 *
	 * @return bool True if the file exists or has been created. False on failure.
	 */
	public function create_htaccess_file() {
		if ( $this->htaccess_exists ) {
			return true;
		}

if ( $this->has_error ) {
			return false;
		}

$dir = $this->get_dir_from_stream( $this->url );

if ( ! $dir || ! is_dir( $dir ) ) {
			$this->has_error = true;
			return false;
		}

$file_path = $dir . '/.htaccess';

if ( file_exists( $file_path ) ) {
			$this->htaccess_exists = true;
			return true;
		}

$this->error_message = null;

set_error_handler( array( $this, 'custom_error_handler' ) );

$file_resource = fopen( $file_path, 'a' );

restore_error_handler();

if ( ! is_resource( $file_resource ) ) {
			$this->has_error = true;
			throw new \UnexpectedValueException( sprintf( 'The file "%s" could not be opened: ' . $this->error_message, $file_path ) );
		}

$new_content = "<Files ~ \"\.log$\">\nOrder allow,deny\nDeny from all\n</Files>\nOptions -Indexes";

fwrite( $file_resource, $new_content );
		fclose( $file_resource );
		@chmod( $file_path, 0644 );

$this->htaccess_exists = true;

return true;
	}

/**
	 * Temporary error handler that "cleans" the error messages.
	 *
	 * @since  3.2
	 * @access private
	 * @see    parent::customErrorHandler()
	 * @author Grégory Viguier
	 *
	 * @param int    $code Error code.
	 * @param string $msg  Error message.
	 */
	private function custom_error_handler( $code, $msg ) {
		$this->error_message = preg_replace( '{^(fopen|mkdir)$.*?$: }', '', $msg );
	}

/**
	 * A dirname() that also works for streams, by removing the protocol.
	 *
	 * @since  3.2
	 * @access private
	 * @see    parent::getDirFromStream()
	 * @author Grégory Viguier
	 *
	 * @param  string $stream Path to a file.
	 * @return null|string
	 */
	private function get_dir_from_stream( $stream ) {
		$pos = strpos( $stream, '://' );

if ( false === $pos ) {
			return dirname( $stream );
		}

if ( 'file://' === substr( $stream, 0, 7 ) ) {
			return dirname( substr( $stream, 7 ) );
		}
	}
}

Editing: class-stream-handler.php

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