ClickHouse/programs/odbc-bridge/SchemaAllowedHandler.cpp

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#include "SchemaAllowedHandler.h"
#if USE_ODBC
# include <IO/WriteBufferFromHTTPServerResponse.h>
# include <IO/WriteHelpers.h>
# include <Poco/Data/ODBC/ODBCException.h>
# include <Poco/Data/ODBC/SessionImpl.h>
# include <Poco/Data/ODBC/Utility.h>
# include <Poco/Net/HTMLForm.h>
# include <Poco/Net/HTTPServerRequest.h>
# include <Poco/Net/HTTPServerResponse.h>
# include <common/logger_useful.h>
# include "validateODBCConnectionString.h"
# define POCO_SQL_ODBC_CLASS Poco::Data::ODBC
namespace DB
{
namespace
{
bool isSchemaAllowed(SQLHDBC hdbc)
{
std::string identifier;
SQLSMALLINT t;
SQLRETURN r = POCO_SQL_ODBC_CLASS::SQLGetInfo(hdbc, SQL_SCHEMA_USAGE, nullptr, 0, &t);
if (POCO_SQL_ODBC_CLASS::Utility::isError(r))
throw POCO_SQL_ODBC_CLASS::ConnectionException(hdbc);
return t != 0;
}
}
void SchemaAllowedHandler::handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response)
{
Poco::Net::HTMLForm params(request, request.stream());
LOG_TRACE(log, "Request URI: {}", request.getURI());
auto process_error = [&response, this](const std::string & message)
{
response.setStatusAndReason(Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR);
if (!response.sent())
response.send() << message << std::endl;
LOG_WARNING(log, message);
};
if (!params.has("connection_string"))
{
process_error("No 'connection_string' in request URL");
return;
}
try
{
std::string connection_string = params.get("connection_string");
POCO_SQL_ODBC_CLASS::SessionImpl session(validateODBCConnectionString(connection_string), DBMS_DEFAULT_CONNECT_TIMEOUT_SEC);
SQLHDBC hdbc = session.dbc().handle();
bool result = isSchemaAllowed(hdbc);
WriteBufferFromHTTPServerResponse out(request, response, keep_alive_timeout);
writeBoolText(result, out);
}
catch (...)
{
process_error("Error getting schema usage from ODBC '" + getCurrentExceptionMessage(false) + "'");
tryLogCurrentException(log);
}
}
}
#endif