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#include <Server/HTTP/HTTPServerRequest.h>
#include <IO/EmptyReadBuffer.h>
#include <IO/HTTPChunkedReadBuffer.h>
#include <IO/LimitReadBuffer.h>
#include <IO/ReadBufferFromPocoSocket.h>
#include <IO/ReadHelpers.h>
#include <Server/HTTP/HTTPServerResponse.h>
#include <Server/HTTP/ReadHeaders.h>
#include <Poco/Net/HTTPHeaderStream.h>
#include <Poco/Net/HTTPStream.h>
#include <Poco/Net/NetException.h>
#include <Common/logger_useful.h>
#if USE_SSL
#include <Poco/Net/SecureStreamSocketImpl.h>
#include <Poco/Net/SSLException.h>
#include <Poco/Net/X509Certificate.h>
#endif
namespace DB
{
HTTPServerRequest::HTTPServerRequest(HTTPContextPtr context, HTTPServerResponse & response, Poco::Net::HTTPServerSession & session)
: max_uri_size(context->getMaxUriSize())
, max_fields_number(context->getMaxFields())
, max_field_name_size(context->getMaxFieldNameSize())
, max_field_value_size(context->getMaxFieldValueSize())
{
response.attachRequest(this);
/// Now that we know socket is still connected, obtain addresses
client_address = session.clientAddress();
server_address = session.serverAddress();
secure = session.socket().secure();
auto receive_timeout = context->getReceiveTimeout();
auto send_timeout = context->getSendTimeout();
session.socket().setReceiveTimeout(receive_timeout);
session.socket().setSendTimeout(send_timeout);
auto in = std::make_unique<ReadBufferFromPocoSocket>(session.socket());
socket = session.socket().impl();
readRequest(*in); /// Try parse according to RFC7230
/// If a client crashes, most systems will gracefully terminate the connection with FIN just like it's done on close().
/// So we will get 0 from recv(...) and will not be able to understand that something went wrong (well, we probably
/// will get RST later on attempt to write to the socket that closed on the other side, but it will happen when the query is finished).
/// If we are extremely unlucky and data format is TSV, for example, then we may stop parsing exactly between rows
/// and decide that it's EOF (but it is not). It may break deduplication, because clients cannot control it
/// and retry with exactly the same (incomplete) set of rows.
/// That's why we have to check body size if it's provided.
if (getChunkedTransferEncoding())
stream = std::make_unique<HTTPChunkedReadBuffer>(std::move(in), context->getMaxChunkSize());
else if (hasContentLength())
{
size_t content_length = getContentLength();
stream = std::make_unique<LimitReadBuffer>(std::move(in), content_length,
/* trow_exception */ true, /* exact_limit */ content_length);
}
else if (getMethod() != HTTPRequest::HTTP_GET && getMethod() != HTTPRequest::HTTP_HEAD && getMethod() != HTTPRequest::HTTP_DELETE)
{
stream = std::move(in);
if (!startsWith(getContentType(), "multipart/form-data"))
LOG_WARNING(LogFrequencyLimiter(&Poco::Logger::get("HTTPServerRequest"), 10), "Got an HTTP request with no content length "
"and no chunked/multipart encoding, it may be impossible to distinguish graceful EOF from abnormal connection loss");
}
else
/// We have to distinguish empty buffer and nullptr.
stream = std::make_unique<EmptyReadBuffer>();
}
bool HTTPServerRequest::checkPeerConnected() const
{
try
{
char b;
if (!socket->receiveBytes(&b, 1, MSG_DONTWAIT | MSG_PEEK))
return false;
}
catch (Poco::TimeoutException &)
{
}
catch (...)
{
return false;
}
return true;
}
#if USE_SSL
bool HTTPServerRequest::havePeerCertificate() const
{
if (!secure)
return false;
const Poco::Net::SecureStreamSocketImpl * secure_socket = dynamic_cast<const Poco::Net::SecureStreamSocketImpl *>(socket);
if (!secure_socket)
return false;
return secure_socket->havePeerCertificate();
}
Poco::Net::X509Certificate HTTPServerRequest::peerCertificate() const
{
if (secure)
{
const Poco::Net::SecureStreamSocketImpl * secure_socket = dynamic_cast<const Poco::Net::SecureStreamSocketImpl *>(socket);
if (secure_socket)
return secure_socket->peerCertificate();
}
throw Poco::Net::SSLException("No certificate available");
}
#endif
void HTTPServerRequest::readRequest(ReadBuffer & in)
{
char ch;
std::string method;
std::string uri;
std::string version;
method.reserve(16);
uri.reserve(64);
version.reserve(16);
if (in.eof())
throw Poco::Net::NoMessageException();
skipWhitespaceIfAny(in);
if (in.eof())
throw Poco::Net::MessageException("No HTTP request header");
while (in.read(ch) && !Poco::Ascii::isSpace(ch) && method.size() <= MAX_METHOD_LENGTH)
method += ch;
if (method.size() > MAX_METHOD_LENGTH)
throw Poco::Net::MessageException("HTTP request method invalid or too long");
skipWhitespaceIfAny(in);
while (in.read(ch) && !Poco::Ascii::isSpace(ch) && uri.size() <= max_uri_size)
uri += ch;
if (uri.size() > max_uri_size)
throw Poco::Net::MessageException("HTTP request URI invalid or too long");
skipWhitespaceIfAny(in);
while (in.read(ch) && !Poco::Ascii::isSpace(ch) && version.size() <= MAX_VERSION_LENGTH)
version += ch;
if (version.size() > MAX_VERSION_LENGTH)
throw Poco::Net::MessageException("Invalid HTTP version string");
// since HTTP always use Windows-style EOL '\r\n' we always can safely skip to '\n'
skipToNextLineOrEOF(in);
readHeaders(*this, in, max_fields_number, max_field_name_size, max_field_value_size);
skipToNextLineOrEOF(in);
setMethod(method);
setURI(uri);
setVersion(version);
}
}
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