/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "HttpConnection.h"

#include <sstream>

#include "util.h"
#include "message.h"
#include "prefs.h"
#include "LogFactory.h"
#include "DlRetryEx.h"
#include "DlAbortEx.h"
#include "Request.h"
#include "Segment.h"
#include "HttpRequest.h"
#include "HttpResponse.h"
#include "HttpHeaderProcessor.h"
#include "HttpHeader.h"
#include "Logger.h"
#include "Socket.h"
#include "Option.h"
#include "CookieStorage.h"
#include "AuthConfigFactory.h"
#include "AuthConfig.h"
#include "a2functional.h"
#include "fmt.h"
#include "SocketRecvBuffer.h"

namespace aria2 {

HttpRequestEntry::HttpRequestEntry
(const SharedHandle<HttpRequest>& httpRequest)
  : httpRequest_(httpRequest),
    proc_(new HttpHeaderProcessor())
{}

HttpRequestEntry::~HttpRequestEntry() {}

HttpConnection::HttpConnection
(cuid_t cuid,
 const SocketHandle& socket,
 const SharedHandle<SocketRecvBuffer>& socketRecvBuffer)
  : cuid_(cuid),
    socket_(socket),
    socketRecvBuffer_(socketRecvBuffer),
    socketBuffer_(socket)
{}

HttpConnection::~HttpConnection() {}

std::string HttpConnection::eraseConfidentialInfo(const std::string& request)
{
  std::istringstream istr(request);
  std::string result;
  std::string line;
  while(getline(istr, line)) {
    static const std::string AUTH_HEADER("Authorization: Basic");
    static const std::string PROXY_AUTH_HEADER("Proxy-Authorization: Basic");
    if(util::startsWith(line, AUTH_HEADER)) {
      result += "Authorization: Basic ********\n";
    } else if(util::startsWith(line, PROXY_AUTH_HEADER)) {
      result += "Proxy-Authorization: Basic ********\n";
    } else {
      strappend(result, line, "\n");
    }
  }
  return result;
}

void HttpConnection::sendRequest(const SharedHandle<HttpRequest>& httpRequest)
{
  std::string request = httpRequest->createRequest();
  A2_LOG_INFO(fmt(MSG_SENDING_REQUEST,
                  cuid_,
                  eraseConfidentialInfo(request).c_str()));
  socketBuffer_.pushStr(request);
  socketBuffer_.send();
  SharedHandle<HttpRequestEntry> entry(new HttpRequestEntry(httpRequest));
  outstandingHttpRequests_.push_back(entry);
}

void HttpConnection::sendProxyRequest
(const SharedHandle<HttpRequest>& httpRequest)
{
  std::string request = httpRequest->createProxyRequest();
  A2_LOG_INFO(fmt(MSG_SENDING_REQUEST,
                  cuid_,
                  eraseConfidentialInfo(request).c_str()));
  socketBuffer_.pushStr(request);
  socketBuffer_.send();
  SharedHandle<HttpRequestEntry> entry(new HttpRequestEntry(httpRequest));
  outstandingHttpRequests_.push_back(entry);
}

SharedHandle<HttpResponse> HttpConnection::receiveResponse()
{
  if(outstandingHttpRequests_.empty()) {
    throw DL_ABORT_EX(EX_NO_HTTP_REQUEST_ENTRY_FOUND);
  }
  HttpRequestEntryHandle entry = outstandingHttpRequests_.front();
  HttpHeaderProcessorHandle proc = entry->getHttpHeaderProcessor();
  if(socketRecvBuffer_->bufferEmpty()) {
    if(socketRecvBuffer_->recv() == 0 &&
       !socket_->wantRead() && !socket_->wantWrite()) {
      throw DL_RETRY_EX(EX_GOT_EOF);
    }
  }
  proc->update(socketRecvBuffer_->getBuffer(),
               socketRecvBuffer_->getBufferLength());
  SharedHandle<HttpResponse> httpResponse;
  size_t shiftBufferLength;
  if(proc->eoh()) {
    SharedHandle<HttpHeader> httpHeader = proc->getHttpResponseHeader();
    size_t putbackDataLength = proc->getPutBackDataLength();
    A2_LOG_INFO(fmt(MSG_RECEIVE_RESPONSE,
                    cuid_,
                    proc->getHeaderString().c_str()));
    assert(socketRecvBuffer_->getBufferLength() >= putbackDataLength);
    shiftBufferLength = socketRecvBuffer_->getBufferLength()-putbackDataLength;
    httpResponse.reset(new HttpResponse());
    httpResponse->setCuid(cuid_);
    httpResponse->setHttpHeader(httpHeader);
    httpResponse->setHttpRequest(entry->getHttpRequest());
    outstandingHttpRequests_.pop_front();
  } else {
    shiftBufferLength = socketRecvBuffer_->getBufferLength();
  }
  socketRecvBuffer_->shiftBuffer(shiftBufferLength);
  return httpResponse;
}

bool HttpConnection::isIssued(const SharedHandle<Segment>& segment) const
{
  for(HttpRequestEntries::const_iterator itr = outstandingHttpRequests_.begin(),
        eoi = outstandingHttpRequests_.end(); itr != eoi; ++itr) {
    SharedHandle<HttpRequest> httpRequest = (*itr)->getHttpRequest();
    if(*httpRequest->getSegment() == *segment) {
      return true;
    }
  }
  return false;
}

SharedHandle<HttpRequest> HttpConnection::getFirstHttpRequest() const
{
  if(outstandingHttpRequests_.empty()) {
    return SharedHandle<HttpRequest>();
  } else {
    return outstandingHttpRequests_.front()->getHttpRequest();
  }
}

bool HttpConnection::sendBufferIsEmpty() const
{
  return socketBuffer_.sendBufferIsEmpty();
}

void HttpConnection::sendPendingData()
{
  socketBuffer_.send();
}

} // namespace aria2