summaryrefslogtreecommitdiffstats
path: root/system/core/Log.php
blob: 3c9a89a5ffaa8687fefc7b558274f28ab89fdf8c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @license	https://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'] !== '')
			? rtrim($config['log_path'], '/\\').DIRECTORY_SEPARATOR : APPPATH.'logs'.DIRECTORY_SEPARATOR;

		$this->_file_ext = (isset($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	$message 	The log message
	 * @return	string	Formatted log line with a new line character '\r\n' at the end
	 */
	protected function _format_line($level, $date, $message)
	{
		return $level.' - '.$date.' --> '.$message.PHP_EOL;
	}

	// --------------------------------------------------------------------

	/**
	 * 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)
		{
			return mb_substr($str, $start, $length, '8bit');
		}

		return isset($length)
			? substr($str, $start, $length)
			: substr($str, $start);
	}
}