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<?php
/**
* Class MC4WP_Debug_Log
*
* Simple logging class which writes to a file, loosely based on PSR-3.
*/
class MC4WP_Debug_Log
{
/**
* Detailed debug information
*/
public const DEBUG = 100;
/**
* Interesting events
*
* Examples: Visitor subscribed
*/
public const INFO = 200;
/**
* Exceptional occurrences that are not errors
*
* Examples: User already subscribed
*/
public const WARNING = 300;
/**
* Runtime errors
*/
public const ERROR = 400;
/**
* Logging levels from syslog protocol defined in RFC 5424
*
* @var array $levels Logging levels
*/
protected static $levels = [
self::DEBUG => 'DEBUG',
self::INFO => 'INFO',
self::WARNING => 'WARNING',
self::ERROR => 'ERROR',
];
/**
* @var string The file to which messages should be written.
*/
public $file;
/**
* @var int Only write messages with this level or higher
*/
public $level;
/**
* @var resource
*/
protected $stream;
/**
* MC4WP_Debug_Log constructor.
*
* @param string $file
* @param mixed $level;
*/
public function __construct($file, $level = self::DEBUG)
{
$this->file = $file;
$this->level = self::to_level($level);
}
/**
* @param mixed $level
* @param string $message
* @return boolean
*/
public function log($level, $message)
{
$level = self::to_level($level);
// only log if message level is higher than log level
if ($level < $this->level) {
return false;
}
// obfuscate email addresses in log message since log might be public.
$message = mc4wp_obfuscate_email_addresses((string) $message);
// first, get rid of everything between "invisible" tags
$message = preg_replace('/<(?:style|script|head)>.+?<\/(?:style|script|head)>/is', '', $message);
// then, strip tags (while retaining content of these tags)
$message = strip_tags($message);
$message = trim($message);
/**
* Modifies the message that is written to the debug log.
* Return an empty string to skip logging this message altogether.
*
* @param string $message
*/
$message = apply_filters('mc4wp_debug_log_message', $message);
if (empty($message)) {
return false;
}
// generate line
$level_name = self::get_level_name($level);
$datetime = gmdate('Y-m-d H:i:s', time() + ( get_option('gmt_offset', 0) * HOUR_IN_SECONDS ));
$message = sprintf('[%s] %s: %s', $datetime, $level_name, $message) . PHP_EOL;
// did we open stream yet?
if (! is_resource($this->stream)) {
// attempt to open stream
$this->stream = @fopen($this->file, 'c+');
if (! is_resource($this->stream)) {
return false;
}
// make sure first line of log file is a PHP tag + exit statement (to prevent direct file access)
$line = fgets($this->stream);
$php_exit_string = '<?php exit; ?>';
if (strpos($line, $php_exit_string) !== 0) {
rewind($this->stream);
fwrite($this->stream, $php_exit_string . PHP_EOL . $line);
}
// place pointer at end of file
fseek($this->stream, 0, SEEK_END);
}
// lock file while we write, ignore errors (not much we can do)
flock($this->stream, LOCK_EX);
// write the message to the file
fwrite($this->stream, $message);
// unlock file again, but don't close it for remainder of this request
flock($this->stream, LOCK_UN);
return true;
}
/**
* @param string $message
* @return boolean
*/
public function warning($message)
{
return $this->log(self::WARNING, $message);
}
/**
* @param string $message
* @return boolean
*/
public function info($message)
{
return $this->log(self::INFO, $message);
}
/**
* @param string $message
* @return boolean
*/
public function error($message)
{
return $this->log(self::ERROR, $message);
}
/**
* @param string $message
* @return boolean
*/
public function debug($message)
{
return $this->log(self::DEBUG, $message);
}
/**
* Converts PSR-3 levels to local ones if necessary
*
* @param string|int Level number or name (PSR-3)
* @return int
*/
public static function to_level($level)
{
if (is_string($level)) {
$level = strtoupper($level);
if (defined(__CLASS__ . '::' . $level)) {
return constant(__CLASS__ . '::' . $level);
}
throw new InvalidArgumentException('Level "' . $level . '" is not defined, use one of: ' . implode(', ', array_keys(self::$levels)));
}
return $level;
}
/**
* Gets the name of the logging level.
*
* @param int $level
* @return string
*/
public static function get_level_name($level)
{
if (! isset(self::$levels[ $level ])) {
throw new InvalidArgumentException('Level "' . $level . '" is not defined, use one of: ' . implode(', ', array_keys(self::$levels)));
}
return self::$levels[ $level ];
}
/**
* Tests if the log file is writable
*
* @return bool
*/
public function test()
{
$handle = @fopen($this->file, 'a');
$writable = false;
if (is_resource($handle)) {
$writable = true;
fclose($handle);
}
return $writable;
}
}