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wp-content/plugins/wp-smushit/core/class-file-system.php

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+<?php
+
+namespace Smush\Core;
+
+class File_System {
+	public function file_get_contents( $path, $use_include_path = false, $context = null, $offset = 0, $length = null ) {
+		if ( ! $this->is_valid_path( $path ) ) {
+			return false;
+		}
+
+		$args = array( $path, $use_include_path, $context, $offset );
+		if ( ! is_null( $length ) ) {
+			// 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.
+			$args[] = $length;
+		}
+
+		return call_user_func_array( 'file_get_contents', $args );
+	}
+
+	public function file_exists( $path ) {
+		return $this->validate_and_call( 'file_exists', $path );
+	}
+
+	public function unlink( $path ) {
+		return $this->validate_and_call( 'unlink', $path );
+	}
+
+	public function copy( $source, $destination ) {
+		return $this->validate_and_call( 'copy', $source, $destination );
+	}
+
+	public function is_file( $file ) {
+		return $this->validate_and_call( 'is_file', $file );
+	}
+
+	public function is_dir( $path ) {
+		return $this->validate_and_call( 'is_dir', $path );
+	}
+
+	public function filesize( $file ) {
+		return $this->validate_and_call( 'filesize', $file );
+	}
+
+	public function getimagesize( $path ) {
+		return $this->validate_and_call( 'getimagesize', $path );
+	}
+
+	private function validate_and_call( $callback, ...$args ) {
+		foreach ( $args as $arg ) {
+			if ( ! $this->is_valid_path( $arg ) ) {
+				return false;
+			}
+		}
+
+		return call_user_func_array( $callback, $args );
+	}
+
+	private function is_valid_path( $path ) {
+		return false === stripos( $path, 'phar://' );
+	}
+}