node-clf-parser/index.js at master · indexzero/node-clf-parser · GitHub

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module.exports = function (line) {

  var parsed = {};

  //
  // Trailing newline? NOTHX
  //
  if (line.match(/\n$/)) {
    line = line.slice(0, line.length - 1);
  }

  //
  // Pull out as many fields as possible
  //
  [
    { 'remote_addr'          : ' - ' },
    { 'remote_user'          : ' ['  },
    { 'time_local'           : '] "' },
    { 'request'              : '" '  },
    { 'status'               : ' '   },
    { 'body_bytes_sent'      : ' '   },
    { 'http_referer'         : ' "'  },
    { 'http_user_agent'      : '" "' },
    { 'http_x_forwarded_for' : '"'   }
  ].some(function (t) {
    var label = Object.keys(t)[0],
        delimiter = t[label],
        field;

    var m = line.match(escape(delimiter));

    if (m === null) {
      //
      // No match. Try to pick off the last element.
      //
      m = line.match(escape(delimiter.slice(0, 1)));

      if (m === null) {
        field = line;
      }
      else {
        field = line.substr(0, m.index);
      }

      parsed[label] = field;

      return true;
    }

    field = line.substr(0, m.index);
    line = line.substr(m.index + delimiter.length);

    parsed[label] = field;
  });

  //
  // So the fields don't choke the implicit RegExp(str) in .match
  //
  function escape(d) {
    return d
      .replace('[', '\\[')
      .replace(']', '\\]')
    ;
  }

  //
  // Deal with placeholders
  //
  Object.keys(parsed).forEach(function (k) {
    if (parsed[k] === '-') {
      parsed[k] = null;
    }
  });

  //
  // Parse the "local time" field into a javascript date object
  //
  if (parsed.time_local) {
    parsed.time_local = (function (str) {
      var m,
          month, day, year, hh, mm, ss, offset = {};

      //
      // Day
      //
      m = str.match('/');
      day = parseInt(str.substr(0, m.index), 10);
      str = str.substr(m.index + 1);

      //
      // Month
      //
      m = str.match('/');
      month = str.substr(0, m.index);
      str = str.substr(m.index + 1);

      month = 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'
        .split(' ')
        .indexOf(month)
      ;

      //
      // WHAT YEAR
      //
      m = str.match(':');
      year = parseInt(str.substr(0, m.index), 10);
      str = str.substr(m.index + 1);

      //
      // Hours
      //
      m = str.match(':');
      hh = parseInt(str.substr(0, m.index), 10);
      str = str.substr(m.index + 1);

      //
      // Minutes
      //
      m = str.match(':');
      mm = parseInt(str.substr(0, m.index), 10);
      str = str.substr(m.index + 1);

      //
      // Seconds
      //
      m = str.match(' ');
      ss = parseInt(str.substr(0, m.index), 10);
      str = str.substr(m.index + 1);

      //
      // Time zone offsets
      //
      offset.sign = str.substr(0, 1);
      offset.hh = parseInt(str.substr(1, 2), 10);
      offset.mm = parseInt(str.substr(3, 2), 10);

      switch (offset.sign) {
        case '+': offset.sign = 1; break;
        case '-': offset.sign = -1; break;
      }

      hh += offset.sign * offset.hh;
      mm += offset.sign * offset.mm;

      return new Date(Date.UTC(year, month, day, hh, mm, ss));

    })(parsed.time_local);
  }

  //
  // Do some parseInts on known numerical fields
  //
  if (parsed.status) {
    parsed.status = parseInt(parsed.status, 10);
  }
  if (parsed.body_bytes_sent) {
    parsed.body_bytes_sent = parseInt(parsed.body_bytes_sent, 10);
  }

  return parsed;
};