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#pragma once
#include <IO/PeekableReadBuffer.h>
#include <IO/ReadHelpers.h>
#include <boost/noncopyable.hpp>
#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/NameValueCollection.h>
#include <Poco/Net/PartSource.h>
#include <Poco/URI.h>
namespace DB
{
struct Settings;
class HTMLForm : public Poco::Net::NameValueCollection, private boost::noncopyable
{
public:
class PartHandler;
enum Options
{
OPT_USE_CONTENT_LENGTH = 0x01, /// don't use Chunked Transfer-Encoding for multipart requests.
};
/// Creates an empty HTMLForm and sets the
/// encoding to "application/x-www-form-urlencoded".
explicit HTMLForm(const Settings & settings);
/// Creates an empty HTMLForm that uses the given encoding.
/// Encoding must be either "application/x-www-form-urlencoded" (which is the default) or "multipart/form-data".
explicit HTMLForm(const Settings & settings, const std::string & encoding);
/// Creates a HTMLForm from the given HTTP request.
/// Uploaded files are passed to the given PartHandler.
HTMLForm(const Settings & settings, const Poco::Net::HTTPRequest & request, ReadBuffer & requestBody, PartHandler & handler);
/// Creates a HTMLForm from the given HTTP request.
/// Uploaded files are silently discarded.
HTMLForm(const Settings & settings, const Poco::Net::HTTPRequest & request, ReadBuffer & requestBody);
/// Creates a HTMLForm from the given HTTP request.
/// The request must be a GET request and the form data must be in the query string (URL encoded).
/// For POST requests, you must use one of the constructors taking an additional input stream for the request body.
explicit HTMLForm(const Settings & settings, const Poco::Net::HTTPRequest & request);
explicit HTMLForm(const Settings & settings, const Poco::URI & uri);
template <typename T>
T getParsed(const std::string & key, T default_value)
{
auto it = find(key);
return (it != end()) ? DB::parse<T>(it->second) : default_value;
}
/// Reads the form data from the given HTTP request.
/// Uploaded files are passed to the given PartHandler.
void load(const Poco::Net::HTTPRequest & request, ReadBuffer & requestBody, PartHandler & handler);
/// Reads the form data from the given HTTP request.
/// Uploaded files are silently discarded.
void load(const Poco::Net::HTTPRequest & request, ReadBuffer & requestBody);
/// Reads the URL-encoded form data from the given input stream.
/// Note that read() does not clear the form before reading the new values.
void read(ReadBuffer & in);
static const std::string ENCODING_URL; /// "application/x-www-form-urlencoded"
static const std::string ENCODING_MULTIPART; /// "multipart/form-data"
static const int UNKNOWN_CONTENT_LENGTH;
protected:
void readQuery(ReadBuffer & in);
void readMultipart(ReadBuffer & in, PartHandler & handler);
private:
/// This buffer provides data line by line to check for boundary line in a convenient way.
class MultipartReadBuffer;
struct Part
{
std::string name;
std::unique_ptr<Poco::Net::PartSource> source;
};
using PartVec = std::vector<Part>;
const size_t max_fields_number, max_field_name_size, max_field_value_size;
std::string encoding;
std::string boundary;
PartVec parts;
};
class HTMLForm::PartHandler
{
public:
virtual ~PartHandler() = default;
virtual void handlePart(const Poco::Net::MessageHeader &, ReadBuffer &) = 0;
};
class HTMLForm::MultipartReadBuffer : public ReadBuffer
{
public:
MultipartReadBuffer(ReadBuffer & in, const std::string & boundary);
/// Returns false if last boundary found.
bool skipToNextBoundary();
bool isActualEOF() const { return found_last_boundary; }
private:
PeekableReadBuffer in;
const std::string boundary;
bool boundary_hit = true;
bool found_last_boundary = false;
std::string readLine(bool append_crlf);
bool nextImpl() override;
};
}
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