1 files changed, 296 insertions, 0 deletions
diff --git a/system/core/Log.php b/system/core/Log.php
new file mode 100644
index 000000000..d443aedb8
--- /dev/null
+++ b/system/core/Log.php
@@ -0,0 +1,296 @@
+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package	CodeIgniter
+ * @author	EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license	http://opensource.org/licenses/MIT	MIT License
+ * @link	https://codeigniter.com
+ * @since	Version 1.0.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * Logging Class
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Logging
+ * @author		EllisLab Dev Team
+ * @link		https://codeigniter.com/user_guide/general/errors.html
+ */
+class CI_Log {
+
+	/**
+	 * Path to save log files
+	 *
+	 * @var string
+	 */
+	protected $_log_path;
+
+	/**
+	 * File permissions
+	 *
+	 * @var	int
+	 */
+	protected $_file_permissions = 0644;
+
+	/**
+	 * Level of logging
+	 *
+	 * @var int
+	 */
+	protected $_threshold = 1;
+
+	/**
+	 * Array of threshold levels to log
+	 *
+	 * @var array
+	 */
+	protected $_threshold_array = array();
+
+	/**
+	 * Format of timestamp for log files
+	 *
+	 * @var string
+	 */
+	protected $_date_fmt = 'Y-m-d H:i:s';
+
+	/**
+	 * Filename extension
+	 *
+	 * @var	string
+	 */
+	protected $_file_ext;
+
+	/**
+	 * Whether or not the logger can write to the log files
+	 *
+	 * @var bool
+	 */
+	protected $_enabled = TRUE;
+
+	/**
+	 * Predefined logging levels
+	 *
+	 * @var array
+	 */
+	protected $_levels = array('ERROR' => 1, 'DEBUG' => 2, 'INFO' => 3, 'ALL' => 4);
+
+	/**
+	 * mbstring.func_overload flag
+	 *
+	 * @var	bool
+	 */
+	protected static $func_overload;
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Class constructor
+	 *
+	 * @return	void
+	 */
+	public function __construct()
+	{
+		$config =& get_config();
+
+		isset(self::$func_overload) OR self::$func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));
+
+		$this->_log_path = ($config['log_path'] !== '') ? $config['log_path'] : APPPATH.'logs/';
+		$this->_file_ext = (isset($config['log_file_extension']) && $config['log_file_extension'] !== '')
+			? ltrim($config['log_file_extension'], '.') : 'php';
+
+		file_exists($this->_log_path) OR mkdir($this->_log_path, 0755, TRUE);
+
+		if ( ! is_dir($this->_log_path) OR ! is_really_writable($this->_log_path))
+		{
+			$this->_enabled = FALSE;
+		}
+
+		if (is_numeric($config['log_threshold']))
+		{
+			$this->_threshold = (int) $config['log_threshold'];
+		}
+		elseif (is_array($config['log_threshold']))
+		{
+			$this->_threshold = 0;
+			$this->_threshold_array = array_flip($config['log_threshold']);
+		}
+
+		if ( ! empty($config['log_date_format']))
+		{
+			$this->_date_fmt = $config['log_date_format'];
+		}
+
+		if ( ! empty($config['log_file_permissions']) && is_int($config['log_file_permissions']))
+		{
+			$this->_file_permissions = $config['log_file_permissions'];
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Write Log File
+	 *
+	 * Generally this function will be called using the global log_message() function
+	 *
+	 * @param	string	$level 	The error level: 'error', 'debug' or 'info'
+	 * @param	string	$msg 	The error message
+	 * @return	bool
+	 */
+	public function write_log($level, $msg)
+	{
+		if ($this->_enabled === FALSE)
+		{
+			return FALSE;
+		}
+
+		$level = strtoupper($level);
+
+		if (( ! isset($this->_levels[$level]) OR ($this->_levels[$level] > $this->_threshold))
+			&& ! isset($this->_threshold_array[$this->_levels[$level]]))
+		{
+			return FALSE;
+		}
+
+		$filepath = $this->_log_path.'log-'.date('Y-m-d').'.'.$this->_file_ext;
+		$message = '';
+
+		if ( ! file_exists($filepath))
+		{
+			$newfile = TRUE;
+			// Only add protection to php files
+			if ($this->_file_ext === 'php')
+			{
+				$message .= "<?php defined('BASEPATH') OR exit('No direct script access allowed'); ?>\n\n";
+			}
+		}
+
+		if ( ! $fp = @fopen($filepath, 'ab'))
+		{
+			return FALSE;
+		}
+
+		flock($fp, LOCK_EX);
+
+		// Instantiating DateTime with microseconds appended to initial date is needed for proper support of this format
+		if (strpos($this->_date_fmt, 'u') !== FALSE)
+		{
+			$microtime_full = microtime(TRUE);
+			$microtime_short = sprintf("%06d", ($microtime_full - floor($microtime_full)) * 1000000);
+			$date = new DateTime(date('Y-m-d H:i:s.'.$microtime_short, $microtime_full));
+			$date = $date->format($this->_date_fmt);
+		}
+		else
+		{
+			$date = date($this->_date_fmt);
+		}
+
+		$message .= $this->_format_line($level, $date, $msg);
+
+		for ($written = 0, $length = self::strlen($message); $written < $length; $written += $result)
+		{
+			if (($result = fwrite($fp, self::substr($message, $written))) === FALSE)
+			{
+				break;
+			}
+		}
+
+		flock($fp, LOCK_UN);
+		fclose($fp);
+
+		if (isset($newfile) && $newfile === TRUE)
+		{
+			chmod($filepath, $this->_file_permissions);
+		}
+
+		return is_int($result);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Format the log line.
+	 *
+	 * This is for extensibility of log formatting
+	 * If you want to change the log format, extend the CI_Log class and override this method
+	 *
+	 * @param	string	$level 	The error level
+	 * @param	string	$date 	Formatted date string
+	 * @param	string	$message 	The log message
+	 * @return	string	Formatted log line with a new line character '\n' at the end
+	 */
+	protected function _format_line($level, $date, $message)
+	{
+		return $level.' - '.$date.' --> '.$message."\n";
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Byte-safe strlen()
+	 *
+	 * @param	string	$str
+	 * @return	int
+	 */
+	protected static function strlen($str)
+	{
+		return (self::$func_overload)
+			? mb_strlen($str, '8bit')
+			: strlen($str);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Byte-safe substr()
+	 *
+	 * @param	string	$str
+	 * @param	int	$start
+	 * @param	int	$length
+	 * @return	string
+	 */
+	protected static function substr($str, $start, $length = NULL)
+	{
+		if (self::$func_overload)
+		{
+			// mb_substr($str, $start, null, '8bit') returns an empty
+			// string on PHP 5.3
+			isset($length) OR $length = ($start >= 0 ? self::strlen($str) - $start : -$start);
+			return mb_substr($str, $start, $length, '8bit');
+		}
+
+		return isset($length)
+			? substr($str, $start, $length)
+			: substr($str, $start);
+	}
+}