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#include <rapidjson/document.h>
#include <rapidjson/writer.h>
#include <rapidjson/stringbuffer.h>
#include "rpc_server.h"
#define RPC_PREFIX "rpc."
RPCRequest::RPCRequest(HTTPRequest* request):
request(request)
{
if (!request)
return;
this->body.Parse(request->get_body());
if (!this->body.HasMember("jsonrpc"))
{
spdlog::error("Request is missing 'jsonrpc' field");
this->error(rapidjson::Value("Request is missing 'jsonrpc' field"));
return;
}
else if (this->body["jsonrpc"] != "2.0")
{
spdlog::error("Request has invalid value for 'jsonrpc' field");
this->error(rapidjson::Value("Request has invalid value for 'jsonrpc' field"));
return;
}
if (this->body.HasMember("id"))
{
this->id = this->body["id"];
if (!this->id.IsInt() && !this->id.IsString() && !this->id.IsNull())
{
spdlog::error("Request has invalid type for 'id' field");
this->error(rapidjson::Value("Request has invalid type for 'id' field"));
return;
}
}
if (!this->body.HasMember("method"))
{
spdlog::error("Request is missing 'method' field");
this->error(rapidjson::Value("Request is missing 'method' field"));
return;
}
else if (!this->body["method"].IsString())
{
spdlog::error("Request has invalid type for 'method' field");
this->error(rapidjson::Value("Request has invalid type for 'method' field"));
return;
}
this->method = this->body["method"].GetString();
if (!strncmp(this->method.c_str(), RPC_PREFIX, strlen(RPC_PREFIX)))
{
spdlog::error("Request uses reserved value for 'method' field");
this->error(rapidjson::Value("Request uses reserved value for 'method' field"));
return;
}
if (this->body.HasMember("params"))
{
this->params = this->body["params"];
if (!this->params.IsArray() && !this->params.IsObject())
{
spdlog::error("Request has invalid type for 'params' field");
this->error(rapidjson::Value("Request has invalid type for 'params' field"));
return;
}
}
this->valid = true;
spdlog::debug("Valid request");
}
RPCRequest::~RPCRequest()
{
delete this->request;
}
void RPCRequest::response(rapidjson::Value& response)
{
// a request without an ID is a Notification.
// Nothing we can do about it
if (!this->body.HasMember("id"))
return;
rapidjson::StringBuffer buffer;
rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
response.Accept(writer);
this->request->respond(HTTP_OK, {
{"Content-Type", "application/json"}
}, buffer.GetString());
}
void RPCRequest::result(rapidjson::Value result)
{
if (this->valid && !this->body.HasMember("id"))
return;
rapidjson::MemoryPoolAllocator<>& allocator = this->body.GetAllocator();
rapidjson::Value error_resp;
error_resp.SetObject();
error_resp.AddMember("jsonrpc", "2.0", allocator);
error_resp.AddMember("id", this->id, allocator);
error_resp.AddMember("result", result, allocator);
this->response(error_resp);
}
void RPCRequest::error(rapidjson::Value error)
{
if (!this->body.HasMember("id"))
return;
rapidjson::MemoryPoolAllocator<>& allocator = this->body.GetAllocator();
rapidjson::Value error_resp;
error_resp.SetObject();
error_resp.AddMember("jsonrpc", "2.0", allocator);
error_resp.AddMember("id", this->id, allocator);
error_resp.AddMember("error", error, allocator);
this->response(error_resp);
}
void RPCRequest::close()
{
if (this->request)
{
this->request->close();
}
}
RPCServer::RPCServer(unsigned long addr, unsigned short port):
http_server(addr, port)
{
}
RPCRequest* RPCServer::receive_request()
{
spdlog::debug("awaiting JSON-RPC request");
HTTPRequest* http_req = this->http_server.receive_request();
if (!http_req)
return nullptr;
RPCRequest* rpc_req = new RPCRequest(http_req);
return rpc_req;
}
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