FileLoggingHandler.php

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<?php
 
namespace SimpleSAML\Logger;
 
use SimpleSAML\Logger;
 
class FileLoggingHandler implements LoggingHandlerInterface
{
 
    protected $logFile = null;
 
    private static $levelNames = array(
        Logger::EMERG   => 'EMERGENCY',
        Logger::ALERT   => 'ALERT',
        Logger::CRIT    => 'CRITICAL',
        Logger::ERR     => 'ERROR',
        Logger::WARNING => 'WARNING',
        Logger::NOTICE  => 'NOTICE',
        Logger::INFO    => 'INFO',
        Logger::DEBUG   => 'DEBUG',
    );
    protected $processname = null;
    protected $format;
 
 
    public function __construct(\SimpleSAML_Configuration $config)
    {
        // get the metadata handler option from the configuration
        $this->logFile = $config->getPathValue('loggingdir', 'log/').
            $config->getString('logging.logfile', 'simplesamlphp.log');
        $this->processname = $config->getString('logging.processname', 'SimpleSAMLphp');
 
        if (@file_exists($this->logFile)) {
            if (!@is_writeable($this->logFile)) {
                throw new \Exception("Could not write to logfile: ".$this->logFile);
            }
        } else {
            if (!@touch($this->logFile)) {
                throw new \Exception(
                    "Could not create logfile: ".$this->logFile.
                    " The logging directory is not writable for the web server user."
                );
            }
        }
 
        \SimpleSAML\Utils\Time::initTimezone();
    }
 
 
    public function setLogFormat($format)
    {
        $this->format = $format;
    }
 
 
    public function log($level, $string)
    {
        if (!is_null($this->logFile)) {
            // set human-readable log level. Copied from SimpleSAML\Logger\ErrorLogLoggingHandler.
            $levelName = sprintf('UNKNOWN%d', $level);
            if (array_key_exists($level, self::$levelNames)) {
                $levelName = self::$levelNames[$level];
            }
 
            $formats = array('%process', '%level');
            $replacements = array($this->processname, $levelName);
 
            $matches = array();
            if (preg_match('/%date(?:\{([^\}]+)\})?/', $this->format, $matches)) {
                $format = "%b %d %H:%M:%S";
                if (isset($matches[1])) {
                    $format = $matches[1];
                }
 
                array_push($formats, $matches[0]);
                array_push($replacements, strftime($format));
            }
 
            $string = str_replace($formats, $replacements, $string);
            file_put_contents($this->logFile, $string.PHP_EOL, FILE_APPEND);
        }
    }
}