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Editing: File.php

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<?php
// phpcs:disable WordPress.WP.AlternativeFunctions.file_system_operations_fclose, WordPress.WP.AlternativeFunctions.file_system_operations_fopen, WordPress.WP.AlternativeFunctions.file_system_operations_fwrite, WordPress.WP.AlternativeFunctions.file_system_operations_fgets, WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents, WordPress.WP.AlternativeFunctions.file_system_operations_mkdir, WordPress.WP.AlternativeFunctions.file_system_operations_fread, WordPress.WP.AlternativeFunctions.file_system_operations_chmod, WordPress.WP.AlternativeFunctions.file_system_operations_fputs, WordPress.WP.AlternativeFunctions.file_system_operations_is_writeable, WordPress.WP.AlternativeFunctions.file_system_operations_chown, WordPress.WP.AlternativeFunctions.file_system_operations_chgrp, WordPress.WP.AlternativeFunctions.file_system_operations_touch, WordPress.WP.AlternativeFunctions.file_system_operations_rmdir, WordPress.WP.AlternativeFunctions.file_system_operations_readfile -- Native PHP fileystem function is used for direct control and performance because it can bypass additional layers of abstraction so that no overhead from the WordPress filesystem API's internal handling
// phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler -- we use the set_error_handler() function to provide a flexible way of handling PHP errors according to our needs; we centralises error handling in one place and customises certain errors based on their severity and context.
/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

if (!defined('ABSPATH')) die('No direct access allowed');

if (!class_exists('UDP_Google_Client')) {
  require_once dirname(__FILE__) . '/../autoload.php';
}

/**
 * File logging class based on the PSR-3 standard.
 *
 * This logger writes to a PHP stream resource.
 */
class Google_Logger_File extends Google_Logger_Abstract
{
  /**
   * @var string|resource $file Where logs are written
   */
  private $file;
  /**
   * @var integer $mode The mode to use if the log file needs to be created
   */
  private $mode = 0640;
  /**
   * @var boolean $lock If a lock should be attempted before writing to the log
   */
  private $lock = false;

/**
   * @var integer $trappedErrorNumber Trapped error number
   */
  private $trappedErrorNumber;
  /**
   * @var string $trappedErrorString Trapped error string
   */
  private $trappedErrorString;

/**
   * {@inheritdoc}
   */
  public function __construct(UDP_Google_Client $client)
  {
    parent::__construct($client);

$file = $client->getClassConfig('Google_Logger_File', 'file');
    if (!is_string($file) && !is_resource($file)) {
      throw new Google_Logger_Exception(
          'File logger requires a filename or a valid file pointer'
      );
    }

$mode = $client->getClassConfig('Google_Logger_File', 'mode');
    if (!$mode) {
      $this->mode = $mode;
    }

$this->lock = (bool) $client->getClassConfig('Google_Logger_File', 'lock');
    $this->file = $file;
  }

/**
   * {@inheritdoc}
   */
  protected function write($message)
  {
    if (is_string($this->file)) {
      $this->open();
    } elseif (!is_resource($this->file)) {
      throw new Google_Logger_Exception('File pointer is no longer available');
    }

if ($this->lock) {
      flock($this->file, LOCK_EX);
    }

fwrite($this->file, (string) $message);

if ($this->lock) {
      flock($this->file, LOCK_UN);
    }
  }

/**
   * Opens the log for writing.
   *
   * @return resource
   */
  private function open()
  {
    // Used for trapping `fopen()` errors.
    $this->trappedErrorNumber = null;
    $this->trappedErrorString = null;

$old = set_error_handler(array($this, 'trapError'));

$needsChmod = !file_exists($this->file);
    $fh = fopen($this->file, 'a');

restore_error_handler();

// Handles trapped `fopen()` errors.
    if ($this->trappedErrorNumber) {
      throw new Google_Logger_Exception(
          sprintf(
              "Logger Error: '%s'",
              $this->trappedErrorString // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
          ),
          $this->trappedErrorNumber // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
      );
    }

if ($needsChmod) {
      @chmod($this->file, $this->mode & ~umask());
    }

return $this->file = $fh;
  }

/**
   * Closes the log stream resource.
   */
  private function close()
  {
    if (is_resource($this->file)) {
      fclose($this->file);
    }
  }

/**
   * Traps `fopen()` errors.
   *
   * @param integer $errno The error number
   * @param string $errstr The error string
   */
  private function trapError($errno, $errstr)
  {
    $this->trappedErrorNumber = $errno;
    $this->trappedErrorString = $errstr;
  }

public function __destruct()
  {
    $this->close();
  }
}

Editing: File.php

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