<?php

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namespace Smush\Core;

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class File_System {

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public function file_get_contents( $path, $use_include_path = false, $context = null, $offset = 0, $length = null ) {

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if ( ! $this->is_valid_path( $path ) ) {

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return false;

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}

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$args = array( $path, $use_include_path, $context, $offset );

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if ( ! is_null( $length ) ) {

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// Even though the default value of $length is 'null', an empty string is returned when 'null' is passed as $length. So, we only include it when a non-null value is provided.

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$args[] = $length;

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}

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return call_user_func_array( 'file_get_contents', $args );

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}

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public function file_exists( $path ) {

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return $this->validate_and_call( 'file_exists', $path );

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}

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public function unlink( $path ) {

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return $this->validate_and_call( 'unlink', $path );

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}

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public function copy( $source, $destination ) {

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return $this->validate_and_call( 'copy', $source, $destination );

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}

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public function is_file( $file ) {

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return $this->validate_and_call( 'is_file', $file );

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}

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public function is_dir( $path ) {

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return $this->validate_and_call( 'is_dir', $path );

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}

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public function filesize( $file ) {

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return $this->validate_and_call( 'filesize', $file );

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}

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public function getimagesize( $path ) {

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return $this->validate_and_call( 'getimagesize', $path );

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}

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private function validate_and_call( $callback, ...$args ) {

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foreach ( $args as $arg ) {

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if ( ! $this->is_valid_path( $arg ) ) {

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return false;

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}

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}

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return call_user_func_array( $callback, $args );

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}

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private function is_valid_path( $path ) {

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return false === stripos( $path, 'phar://' );

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}

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public function get_wp_filesystem() {

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global $wp_filesystem;

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if ( is_null( $wp_filesystem ) ) {

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// These aren't included when applying a config from the Hub.

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if ( ! function_exists( 'WP_Filesystem' ) ) {

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require_once ABSPATH . 'wp-admin/includes/file.php';

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}

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WP_Filesystem();

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}

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return $wp_filesystem;

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}

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}

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