/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <log4cxx/logstring.h>

#include <log4cxx/jsonlayout.h>

#include <log4cxx/spi/loggingevent.h>

#include <log4cxx/level.h>

#include <log4cxx/helpers/optionconverter.h>

#include <log4cxx/helpers/cacheddateformat.h>

#include <log4cxx/helpers/simpledateformat.h>

#include <log4cxx/helpers/stringhelper.h>

#include <log4cxx/helpers/transcoder.h>

#include <string.h>

using namespace LOG4CXX_NS;

using namespace LOG4CXX_NS::helpers;

using namespace LOG4CXX_NS::spi;

IMPLEMENT_LOG4CXX_OBJECT(JSONLayout)

struct JSONLayout::JSONLayoutPrivate

{

  JSONLayoutPrivate() :

    locationInfo(false),

    prettyPrint(false),

    ppIndentL1(LOG4CXX_STR("  ")),

    ppIndentL2(LOG4CXX_STR("    ")),

    expectedPatternLength(100),

    threadInfo(false) {}

  // Print no location info by default

  bool locationInfo; //= false

  bool prettyPrint; //= false

  pattern::CachedDateFormat dateFormat

    { std::make_shared<helpers::SimpleDateFormat>(LOG4CXX_STR("yyyy-MM-dd HH:mm:ss,SSS"))

    , pattern::CachedDateFormat::getMaximumCacheValidity(LOG4CXX_STR("yyyy-MM-dd HH:mm:ss,SSS"))

    };

  LogString ppIndentL1;

  LogString ppIndentL2;

  // Expected length of a formatted event excluding the message text

  size_t expectedPatternLength;

  // Thread info is not included by default

  bool threadInfo; //= false

};

JSONLayout::JSONLayout() :

  m_priv(std::make_unique<JSONLayoutPrivate>())

{

}

Unexecuted instantiation: log4cxx::JSONLayout::JSONLayout()

Unexecuted instantiation: log4cxx::JSONLayout::JSONLayout()

JSONLayout::~JSONLayout(){}

void JSONLayout::setLocationInfo(bool locationInfoFlag)

{

  m_priv->locationInfo = locationInfoFlag;

}

bool JSONLayout::getLocationInfo() const

{

  return m_priv->locationInfo;

}

void JSONLayout::setPrettyPrint(bool prettyPrintFlag)

{

  m_priv->prettyPrint = prettyPrintFlag;

}

bool JSONLayout::getPrettyPrint() const

{

  return m_priv->prettyPrint;

}

void JSONLayout::setThreadInfo(bool newValue)

{

  m_priv->threadInfo = newValue;

}

bool JSONLayout::getThreadInfo() const

{

  return m_priv->threadInfo;

}

LogString JSONLayout::getContentType() const

{

  return LOG4CXX_STR("application/json");

}

void JSONLayout::activateOptions(helpers::Pool& /* p */)

{

  m_priv->expectedPatternLength = getFormattedEventCharacterCount() * 2;

}

void JSONLayout::setOption(const LogString& option, const LogString& value)

{

  if (StringHelper::equalsIgnoreCase(option,

      LOG4CXX_STR("LOCATIONINFO"), LOG4CXX_STR("locationinfo")))

  {

    setLocationInfo(OptionConverter::toBoolean(value, false));

  }

  else if (StringHelper::equalsIgnoreCase(option,

      LOG4CXX_STR("THREADINFO"), LOG4CXX_STR("threadinfo")))

  {

    setThreadInfo(OptionConverter::toBoolean(value, false));

  }

  else if (StringHelper::equalsIgnoreCase(option,

      LOG4CXX_STR("PRETTYPRINT"), LOG4CXX_STR("prettyprint")))

  {

    setPrettyPrint(OptionConverter::toBoolean(value, false));

  }

}

void JSONLayout::format(LogString& output,

  const spi::LoggingEventPtr& event,

  Pool& p) const

{

  auto& lsMsg = event->getRenderedMessage();

  output.reserve(m_priv->expectedPatternLength + lsMsg.size());

  output.append(LOG4CXX_STR("{"));

  output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    output.append(m_priv->ppIndentL1);

  }

  output.append(LOG4CXX_STR("\"timestamp\": \""));

  m_priv->dateFormat.format(output, event->getTimeStamp(), p);

  output.append(LOG4CXX_STR("\","));

  output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->threadInfo)

  {

    if (m_priv->prettyPrint)

    {

      output.append(m_priv->ppIndentL1);

    }

    appendQuotedEscapedString(output, LOG4CXX_STR("thread"));

    output.append(LOG4CXX_STR(": "));

    appendQuotedEscapedString(output, event->getThreadName());

    output.append(LOG4CXX_STR(","));

    output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  }

  if (m_priv->prettyPrint)

  {

    output.append(m_priv->ppIndentL1);

  }

  output.append(LOG4CXX_STR("\"level\": "));

  LogString level;

  event->getLevel()->toString(level);

  appendQuotedEscapedString(output, level);

  output.append(LOG4CXX_STR(","));

  output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    output.append(m_priv->ppIndentL1);

  }

  output.append(LOG4CXX_STR("\"logger\": "));

  appendQuotedEscapedString(output, event->getLoggerName());

  output.append(LOG4CXX_STR(","));

  output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    output.append(m_priv->ppIndentL1);

  }

  output.append(LOG4CXX_STR("\"message\": "));

  appendQuotedEscapedString(output, lsMsg);

  appendSerializedMDC(output, event);

  appendSerializedNDC(output, event);

  if (m_priv->locationInfo)

  {

    output.append(LOG4CXX_STR(","));

    output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

    appendSerializedLocationInfo(output, event, p);

  }

  output.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  output.append(LOG4CXX_STR("}"));

  output.append(LOG4CXX_EOL);

}

void JSONLayout::appendQuotedEscapedString(LogString& buf,

  const LogString& input) const

{

  appendItem(input, buf);

}

void JSONLayout::appendItem(const LogString& input, LogString& buf)

{

  auto toHexDigit = [](int ch) -> int

  {

    return (10 <= ch ? (0x61 - 10) : 0x30) + ch;

  };

  /* add leading quote */

  buf.push_back(0x22);

  size_t start = 0;

  size_t index = 0;

  for (int ch : input)

  {

    if (0x22 == ch || 0x5c == ch)

      ;

    else if (0x20 <= ch)

    {

      ++index;

      continue;

    }

    if (start < index)

    {

      buf.append(input, start, index - start);

    }

    switch (ch)

    {

      case 0x08:

        /* \b backspace */

        buf.push_back(0x5c);

        buf.push_back('b');

        break;

      case 0x09:

        /* \t tab */

        buf.push_back(0x5c);

        buf.push_back('t');

        break;

      case 0x0a:

        /* \n newline */

        buf.push_back(0x5c);

        buf.push_back('n');

        break;

      case 0x0c:

        /* \f form feed */

        buf.push_back(0x5c);

        buf.push_back('f');

        break;

      case 0x0d:

        /* \r carriage return */

        buf.push_back(0x5c);

        buf.push_back('r');

        break;

      case 0x22:

        /* \" double quote */

        buf.push_back(0x5c);

        buf.push_back(0x22);

        break;

      case 0x5c:

        /* \\ backslash */

        buf.push_back(0x5c);

        buf.push_back(0x5c);

        break;

      default:

        buf.push_back(0x5c);

        buf.push_back(0x75); // 'u'

        buf.push_back(toHexDigit((ch & 0xF000) >> 12));

        buf.push_back(toHexDigit((ch & 0xF00) >> 8));

        buf.push_back(toHexDigit((ch & 0xF0) >> 4));

        buf.push_back(toHexDigit(ch & 0xF));

        break;

    }

    start = ++index;

  }

  if (start < input.size())

  {

    buf.append(input, start, input.size() - start);

  }

  /* add trailing quote */

  buf.push_back(0x22);

}

void JSONLayout::appendSerializedMDC(LogString& buf,

  const LoggingEventPtr& event) const

{

  LoggingEvent::KeySet keys = event->getMDCKeySet();

  if (keys.empty())

  {

    return;

  }

  buf.append(LOG4CXX_STR(","));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL1);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("context_map"));

  buf.append(LOG4CXX_STR(": {"));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  for (LoggingEvent::KeySet::iterator it = keys.begin();

    it != keys.end(); ++it)

  {

    if (m_priv->prettyPrint)

    {

      buf.append(m_priv->ppIndentL2);

    }

    appendQuotedEscapedString(buf, *it);

    buf.append(LOG4CXX_STR(": "));

    LogString value;

    event->getMDC(*it, value);

    appendQuotedEscapedString(buf, value);

    /* if this isn't the last k:v pair, we need a comma */

    if (it + 1 != keys.end())

    {

      buf.append(LOG4CXX_STR(","));

      buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

    }

    else

    {

      buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

    }

  }

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL1);

  }

  buf.append(LOG4CXX_STR("}"));

}

void JSONLayout::appendSerializedNDC(LogString& buf,

  const LoggingEventPtr& event) const

{

  LogString ndcVal;

  if (!event->getNDC(ndcVal))

  {

    return;

  }

  buf.append(LOG4CXX_STR(","));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL1);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("context_stack"));

  buf.append(LOG4CXX_STR(": ["));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL2);

  }

  appendQuotedEscapedString(buf, ndcVal);

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL1);

  }

  buf.append(LOG4CXX_STR("]"));

}

void JSONLayout::appendSerializedLocationInfo(LogString& buf,

  const LoggingEventPtr& event, Pool& p) const

{

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL1);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("location_info"));

  buf.append(LOG4CXX_STR(": {"));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  const LocationInfo& locInfo = event->getLocationInformation();

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL2);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("file"));

  buf.append(LOG4CXX_STR(": "));

  LOG4CXX_DECODE_CHAR(fileName, locInfo.getFileName());

  appendQuotedEscapedString(buf, fileName);

  buf.append(LOG4CXX_STR(","));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL2);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("line"));

  buf.append(LOG4CXX_STR(": "));

  LogString lineNumber;

  StringHelper::toString(locInfo.getLineNumber(), p, lineNumber);

  appendQuotedEscapedString(buf, lineNumber);

  buf.append(LOG4CXX_STR(","));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL2);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("class"));

  buf.append(LOG4CXX_STR(": "));

  LOG4CXX_DECODE_CHAR(className, locInfo.getClassName());

  appendQuotedEscapedString(buf, className);

  buf.append(LOG4CXX_STR(","));

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL2);

  }

  appendQuotedEscapedString(buf, LOG4CXX_STR("method"));

  buf.append(LOG4CXX_STR(": "));

  LOG4CXX_DECODE_CHAR(methodName, locInfo.getMethodName());

  appendQuotedEscapedString(buf, methodName);

  buf.append(m_priv->prettyPrint ? LOG4CXX_EOL : LOG4CXX_STR(" "));

  if (m_priv->prettyPrint)

  {

    buf.append(m_priv->ppIndentL1);

  }

  buf.append(LOG4CXX_STR("}"));

}