aria2/src/rpc_helper.cc

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2011 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 "rpc_helper.h"
#include "XmlParser.h"
#include "RpcRequest.h"
#include "XmlRpcRequestParserStateMachine.h"
#include "message.h"
#include "DlAbortEx.h"
#include "DownloadEngine.h"
#include "RpcMethod.h"
#include "RpcResponse.h"
#include "RpcMethodFactory.h"
#include "LogFactory.h"
#include "fmt.h"

namespace aria2 {

namespace rpc {

#ifdef ENABLE_XML_RPC
RpcRequest xmlParseMemory(const char* xml, size_t size)
{
  XmlRpcRequestParserStateMachine psm;
  if (xml::XmlParser(&psm).parseFinal(xml, size) < 0) {
    throw DL_ABORT_EX(MSG_CANNOT_PARSE_XML_RPC_REQUEST);
  }
  std::unique_ptr<List> params;
  if (downcast<List>(psm.getCurrentFrameValue())) {
    params.reset(static_cast<List*>(psm.popCurrentFrameValue().release()));
  }
  else {
    params = List::g();
  }
  return {psm.getMethodName(), std::move(params)};
}
#endif // ENABLE_XML_RPC

RpcResponse createJsonRpcErrorResponse(int code, const std::string& msg,
                                       std::unique_ptr<ValueBase> id)
{
  auto params = Dict::g();
  params->put("code", Integer::g(code));
  params->put("message", msg);
  return rpc::RpcResponse{code, rpc::RpcResponse::AUTHORIZED, std::move(params),
                          std::move(id)};
}

RpcResponse processJsonRpcRequest(Dict* jsondict, DownloadEngine* e)
{
  auto id = jsondict->popValue("id");
  if (!id) {
    return createJsonRpcErrorResponse(-32600, "Invalid Request.", Null::g());
  }
  const String* methodName = downcast<String>(jsondict->get("method"));
  if (!methodName) {
    return createJsonRpcErrorResponse(-32600, "Invalid Request.",
                                      std::move(id));
  }
  std::unique_ptr<List> params;
  auto tempParams = jsondict->popValue("params");
  if (downcast<List>(tempParams)) {
    params.reset(static_cast<List*>(tempParams.release()));
  }
  else if (!tempParams) {
    params = List::g();
  }
  else {
    // TODO No support for Named params
    return createJsonRpcErrorResponse(-32602, "Invalid params.", std::move(id));
  }
  A2_LOG_INFO(fmt("Executing RPC method %s", methodName->s().c_str()));
  RpcRequest req = {methodName->s(), std::move(params), std::move(id), true};
  return getMethod(methodName->s())->execute(std::move(req), e);
}

} // namespace rpc

} // namespace aria2