//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.server;
  
  import java.io.IOException;
  import java.util.Locale;
  
  import javax.servlet.http.Cookie;
  
  import org.eclipse.jetty.http.HttpHeader;
  import org.eclipse.jetty.http.PathMap;
  import org.eclipse.jetty.server.handler.StatisticsHandler;
  import org.eclipse.jetty.util.DateCache;
  import org.eclipse.jetty.util.annotation.ManagedAttribute;
  import org.eclipse.jetty.util.component.AbstractLifeCycle;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  /**
   * Base implementation of the {@link RequestLog} outputs logs in the pseudo-standard NCSA common log format.
   * Configuration options allow a choice between the standard Common Log Format (as used in the 3 log format) and the
   * Combined Log Format (single log format). This log format can be output by most web servers, and almost all web log
   * analysis software can understand these formats.
   */
  public abstract class AbstractNCSARequestLog extends AbstractLifeCycle implements RequestLog
  {
      protected static final Logger LOG = Log.getLogger(AbstractNCSARequestLog.class);
  
      private static ThreadLocal<StringBuilder> _buffers = new ThreadLocal<StringBuilder>()
      {
          @Override
          protected StringBuilder initialValue()
          {
              return new StringBuilder(256);
          }
      };
  
  
      private String[] _ignorePaths;
      private boolean _extended;
      private transient PathMap<String> _ignorePathMap;
      private boolean _logLatency = false;
      private boolean _logCookies = false;
      private boolean _logServer = false;
      private boolean _preferProxiedForAddress;
      private transient DateCache _logDateCache;
      private String _logDateFormat = "dd/MMM/yyyy:HH:mm:ss Z";
      private Locale _logLocale = Locale.getDefault();
      private String _logTimeZone = "GMT";
  
      /* ------------------------------------------------------------ */
  
      /**
       * Is logging enabled
       * @return true if logging is enabled
       */
      protected abstract boolean isEnabled();
      
      /* ------------------------------------------------------------ */
  
      /**
       * Write requestEntry out. (to disk or slf4j log)
       * @param requestEntry the request entry
       * @throws IOException if unable to write the entry
       */
      public abstract void write(String requestEntry) throws IOException;
  
      /* ------------------------------------------------------------ */
      
      private void append(StringBuilder buf,String s)
      {
          if (s==null || s.length()==0)
              buf.append('-');
          else
              buf.append(s);
      }
      
      /**
       * Writes the request and response information to the output stream.
       *
       * @see org.eclipse.jetty.server.RequestLog#log(Request, Response)
       */
      @Override
     public void log(Request request, Response response)
     {
         try
         {
             int status = response.getCommittedMetaData().getStatus();
             long written = response.getHttpChannel().getBytesWritten();
             
             if (_ignorePathMap != null && _ignorePathMap.getMatch(request.getRequestURI()) != null)
                 return;
 
             if (!isEnabled())
                 return;
 
             StringBuilder buf = _buffers.get();
             buf.setLength(0);
 
             if (_logServer)
             {
                 append(buf,request.getServerName());
                 buf.append(' ');
             }
 
             String addr = null;
             if (_preferProxiedForAddress)
             {
                 addr = request.getHeader(HttpHeader.X_FORWARDED_FOR.toString());
             }
 
             if (addr == null)
                 addr = request.getRemoteAddr();
 
             buf.append(addr);
             buf.append(" - ");
             Authentication authentication = request.getAuthentication();
             append(buf,(authentication instanceof Authentication.User)?((Authentication.User)authentication).getUserIdentity().getUserPrincipal().getName():null);
 
             buf.append(" [");
             if (_logDateCache != null)
                 buf.append(_logDateCache.format(request.getTimeStamp()));
             else
                 buf.append(request.getTimeStamp());
 
             buf.append("] \"");
             append(buf,request.getMethod());
             buf.append(' ');
             append(buf,request.getHttpURI().toString());
             buf.append(' ');
             append(buf,request.getProtocol());
             buf.append("\" ");
 
             if (status >=0)
             {
                 buf.append((char)('0' + ((status / 100) % 10)));
                 buf.append((char)('0' + ((status / 10) % 10)));
                 buf.append((char)('0' + (status % 10)));
             }
             else
                 buf.append(status);
 
             if (written >= 0)
             {
                 buf.append(' ');
                 if (written > 99999)
                     buf.append(written);
                 else
                 {
                     if (written > 9999)
                         buf.append((char)('0' + ((written / 10000) % 10)));
                     if (written > 999)
                         buf.append((char)('0' + ((written / 1000) % 10)));
                     if (written > 99)
                         buf.append((char)('0' + ((written / 100) % 10)));
                     if (written > 9)
                         buf.append((char)('0' + ((written / 10) % 10)));
                     buf.append((char)('0' + (written) % 10));
                 }
                 buf.append(' ');
             }
             else
                 buf.append(" - ");
 
 
             if (_extended)
                 logExtended(request, buf);
 
             if (_logCookies)
             {
                 Cookie[] cookies = request.getCookies();
                 if (cookies == null || cookies.length == 0)
                     buf.append(" -");
                 else
                 {
                     buf.append(" \"");
                     for (int i = 0; i < cookies.length; i++)
                     {
                         if (i != 0)
                             buf.append(';');
                         buf.append(cookies[i].getName());
                         buf.append('=');
                         buf.append(cookies[i].getValue());
                     }
                     buf.append('\"');
                 }
             }
 
             if (_logLatency)
             {
                 long now = System.currentTimeMillis();
 
                 if (_logLatency)
                 {
                     buf.append(' ');
                     buf.append(now - request.getTimeStamp());
                 }
             }
 
             String log = buf.toString();
             write(log);
         }
         catch (IOException e)
         {
             LOG.warn(e);
         }
     }
     
     /* ------------------------------------------------------------ */
 
     /**
      * Writes extended request and response information to the output stream.
      *
      * @param request  request object
      * @param b        StringBuilder to write to
      * @throws IOException if unable to log the extended information
      */
     protected void logExtended(Request request,
                                StringBuilder b) throws IOException
     {
         String referer = request.getHeader(HttpHeader.REFERER.toString());
         if (referer == null)
             b.append("\"-\" ");
         else
         {
             b.append('"');
             b.append(referer);
             b.append("\" ");
         }
 
         String agent = request.getHeader(HttpHeader.USER_AGENT.toString());
         if (agent == null)
             b.append("\"-\" ");
         else
         {
             b.append('"');
             b.append(agent);
             b.append('"');
         }
     }
 
 
     /**
      * Set request paths that will not be logged.
      *
      * @param ignorePaths array of request paths
      */
     public void setIgnorePaths(String[] ignorePaths)
     {
         _ignorePaths = ignorePaths;
     }
 
     /**
      * Retrieve the request paths that will not be logged.
      *
      * @return array of request paths
      */
     public String[] getIgnorePaths()
     {
         return _ignorePaths;
     }
 
     /**
      * Controls logging of the request cookies.
      *
      * @param logCookies true - values of request cookies will be logged, false - values of request cookies will not be
      *                   logged
      */
     public void setLogCookies(boolean logCookies)
     {
         _logCookies = logCookies;
     }
 
     /**
      * Retrieve log cookies flag
      *
      * @return value of the flag
      */
     public boolean getLogCookies()
     {
         return _logCookies;
     }
 
     /**
      * Controls logging of the request hostname.
      *
      * @param logServer true - request hostname will be logged, false - request hostname will not be logged
      */
     public void setLogServer(boolean logServer)
     {
         _logServer = logServer;
     }
 
     /**
      * Retrieve log hostname flag.
      *
      * @return value of the flag
      */
     public boolean getLogServer()
     {
         return _logServer;
     }
 
     /**
      * Controls logging of request processing time.
      *
      * @param logLatency true - request processing time will be logged false - request processing time will not be
      *                   logged
      */
     public void setLogLatency(boolean logLatency)
     {
         _logLatency = logLatency;
     }
 
     /**
      * Retrieve log request processing time flag.
      *
      * @return value of the flag
      */
     public boolean getLogLatency()
     {
         return _logLatency;
     }
 
     /**
      * @param value true to log dispatch
      * @deprecated use {@link StatisticsHandler}
      */
     @Deprecated
     public void setLogDispatch(boolean value)
     {
     }
 
     /**
      * @return true if logging dispatches
      * @deprecated use {@link StatisticsHandler}
      */
     @Deprecated
     public boolean isLogDispatch()
     {
         return false;
     }
 
     /**
      * Controls whether the actual IP address of the connection or the IP address from the X-Forwarded-For header will
      * be logged.
      *
      * @param preferProxiedForAddress true - IP address from header will be logged, false - IP address from the
      *                                connection will be logged
      */
     public void setPreferProxiedForAddress(boolean preferProxiedForAddress)
     {
         _preferProxiedForAddress = preferProxiedForAddress;
     }
 
     /**
      * Retrieved log X-Forwarded-For IP address flag.
      *
      * @return value of the flag
      */
     public boolean getPreferProxiedForAddress()
     {
         return _preferProxiedForAddress;
     }
 
     /**
      * Set the extended request log format flag.
      *
      * @param extended true - log the extended request information, false - do not log the extended request information
      */
     public void setExtended(boolean extended)
     {
         _extended = extended;
     }
 
     /**
      * Retrieve the extended request log format flag.
      *
      * @return value of the flag
      */
     @ManagedAttribute("use extended NCSA format")
     public boolean isExtended()
     {
         return _extended;
     }
 
     /**
      * Set up request logging and open log file.
      *
      * @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStart()
      */
     @Override
     protected synchronized void doStart() throws Exception
     {
         if (_logDateFormat != null)
         {
             _logDateCache = new DateCache(_logDateFormat, _logLocale ,_logTimeZone);
         }
 
         if (_ignorePaths != null && _ignorePaths.length > 0)
         {
             _ignorePathMap = new PathMap<>();
             for (int i = 0; i < _ignorePaths.length; i++)
                 _ignorePathMap.put(_ignorePaths[i], _ignorePaths[i]);
         }
         else
             _ignorePathMap = null;
 
         super.doStart();
     }
 
     @Override
     protected void doStop() throws Exception
     {
         _logDateCache = null;
         super.doStop();
     }
 
     /**
      * Set the timestamp format for request log entries in the file. If this is not set, the pre-formated request
      * timestamp is used.
      *
      * @param format timestamp format string
      */
     public void setLogDateFormat(String format)
     {
         _logDateFormat = format;
     }
 
     /**
      * Retrieve the timestamp format string for request log entries.
      *
      * @return timestamp format string.
      */
     public String getLogDateFormat()
     {
         return _logDateFormat;
     }
 
     /**
      * Set the locale of the request log.
      *
      * @param logLocale locale object
      */
     public void setLogLocale(Locale logLocale)
     {
         _logLocale = logLocale;
     }
 
     /**
      * Retrieve the locale of the request log.
      *
      * @return locale object
      */
     public Locale getLogLocale()
     {
         return _logLocale;
     }
 
     /**
      * Set the timezone of the request log.
      *
      * @param tz timezone string
      */
     public void setLogTimeZone(String tz)
     {
         _logTimeZone = tz;
     }
 
     /**
      * Retrieve the timezone of the request log.
      *
      * @return timezone string
      */
     @ManagedAttribute("the timezone")
     public String getLogTimeZone()
     {
         return _logTimeZone;
     }
 }