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524 lines
23 KiB
C++
524 lines
23 KiB
C++
#pragma once
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#include <boost/algorithm/string/predicate.hpp>
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#include <boost/array.hpp>
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#include "crow/socket_adaptors.h"
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#include "crow/http_request.h"
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#include "crow/TinySHA1.hpp"
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namespace crow
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{
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namespace websocket
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{
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enum class WebSocketReadState
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{
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MiniHeader,
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Len16,
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Len64,
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Mask,
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Payload,
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};
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struct connection
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{
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virtual void send_binary(const std::string& msg) = 0;
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virtual void send_text(const std::string& msg) = 0;
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virtual void close(const std::string& msg = "quit") = 0;
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virtual ~connection(){}
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void userdata(void* u) { userdata_ = u; }
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void* userdata() { return userdata_; }
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private:
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void* userdata_;
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};
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template <typename Adaptor>
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class Connection : public connection
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{
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public:
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Connection(const crow::request& req, Adaptor&& adaptor,
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std::function<void(crow::websocket::connection&)> open_handler,
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std::function<void(crow::websocket::connection&, const std::string&, bool)> message_handler,
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std::function<void(crow::websocket::connection&, const std::string&)> close_handler,
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std::function<void(crow::websocket::connection&)> error_handler,
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std::function<bool(const crow::request&)> accept_handler)
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: adaptor_(std::move(adaptor)), open_handler_(std::move(open_handler)), message_handler_(std::move(message_handler)), close_handler_(std::move(close_handler)), error_handler_(std::move(error_handler))
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, accept_handler_(std::move(accept_handler))
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{
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if (!boost::iequals(req.get_header_value("upgrade"), "websocket"))
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{
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adaptor.close();
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delete this;
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return;
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}
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if (accept_handler_)
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{
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if (!accept_handler_(req))
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{
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adaptor.close();
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delete this;
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return;
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}
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}
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// Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
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// Sec-WebSocket-Version: 13
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std::string magic = req.get_header_value("Sec-WebSocket-Key") + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
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sha1::SHA1 s;
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s.processBytes(magic.data(), magic.size());
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uint8_t digest[20];
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s.getDigestBytes(digest);
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start(crow::utility::base64encode((char*)digest, 20));
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}
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template<typename CompletionHandler>
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void dispatch(CompletionHandler handler)
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{
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adaptor_.get_io_service().dispatch(handler);
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}
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template<typename CompletionHandler>
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void post(CompletionHandler handler)
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{
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adaptor_.get_io_service().post(handler);
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}
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void send_pong(const std::string& msg)
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{
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dispatch([this, msg]{
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char buf[3] = "\x8A\x00";
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buf[1] += msg.size();
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write_buffers_.emplace_back(buf, buf+2);
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write_buffers_.emplace_back(msg);
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do_write();
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});
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}
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void send_binary(const std::string& msg) override
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{
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dispatch([this, msg]{
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auto header = build_header(2, msg.size());
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write_buffers_.emplace_back(std::move(header));
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write_buffers_.emplace_back(msg);
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do_write();
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});
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}
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void send_text(const std::string& msg) override
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{
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dispatch([this, msg]{
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auto header = build_header(1, msg.size());
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write_buffers_.emplace_back(std::move(header));
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write_buffers_.emplace_back(msg);
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do_write();
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});
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}
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void close(const std::string& msg) override
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{
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dispatch([this, msg]{
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has_sent_close_ = true;
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if (has_recv_close_ && !is_close_handler_called_)
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{
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is_close_handler_called_ = true;
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if (close_handler_)
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close_handler_(*this, msg);
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}
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auto header = build_header(0x8, msg.size());
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write_buffers_.emplace_back(std::move(header));
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write_buffers_.emplace_back(msg);
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do_write();
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});
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}
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protected:
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std::string build_header(int opcode, size_t size)
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{
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char buf[2+8] = "\x80\x00";
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buf[0] += opcode;
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if (size < 126)
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{
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buf[1] += size;
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return {buf, buf+2};
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}
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else if (size < 0x10000)
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{
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buf[1] += 126;
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*(uint16_t*)(buf+2) = htons((uint16_t)size);
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return {buf, buf+4};
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}
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else
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{
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buf[1] += 127;
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*(uint64_t*)(buf+2) = ((1==htonl(1)) ? (uint64_t)size : ((uint64_t)htonl((size) & 0xFFFFFFFF) << 32) | htonl((size) >> 32));
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return {buf, buf+10};
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}
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}
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void start(std::string&& hello)
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{
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static std::string header = "HTTP/1.1 101 Switching Protocols\r\n"
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"Upgrade: websocket\r\n"
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"Connection: Upgrade\r\n"
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"Sec-WebSocket-Accept: ";
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static std::string crlf = "\r\n";
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write_buffers_.emplace_back(header);
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write_buffers_.emplace_back(std::move(hello));
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write_buffers_.emplace_back(crlf);
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write_buffers_.emplace_back(crlf);
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do_write();
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if (open_handler_)
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open_handler_(*this);
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do_read();
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}
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void do_read()
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{
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is_reading = true;
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switch(state_)
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{
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case WebSocketReadState::MiniHeader:
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{
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//boost::asio::async_read(adaptor_.socket(), boost::asio::buffer(&mini_header_, 1),
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adaptor_.socket().async_read_some(boost::asio::buffer(&mini_header_, 2),
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[this](const boost::system::error_code& ec, std::size_t
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#ifdef CROW_ENABLE_DEBUG
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bytes_transferred
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#endif
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)
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{
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is_reading = false;
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mini_header_ = htons(mini_header_);
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#ifdef CROW_ENABLE_DEBUG
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if (!ec && bytes_transferred != 2)
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{
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throw std::runtime_error("WebSocket:MiniHeader:async_read fail:asio bug?");
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}
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#endif
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if (!ec && ((mini_header_ & 0x80) == 0x80))
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{
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if ((mini_header_ & 0x7f) == 127)
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{
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state_ = WebSocketReadState::Len64;
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}
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else if ((mini_header_ & 0x7f) == 126)
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{
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state_ = WebSocketReadState::Len16;
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}
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else
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{
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remaining_length_ = mini_header_ & 0x7f;
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state_ = WebSocketReadState::Mask;
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}
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do_read();
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}
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else
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{
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close_connection_ = true;
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adaptor_.close();
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if (error_handler_)
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error_handler_(*this);
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check_destroy();
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}
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});
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}
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break;
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case WebSocketReadState::Len16:
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{
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remaining_length_ = 0;
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uint16_t remaining_length16_ = 0;
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boost::asio::async_read(adaptor_.socket(), boost::asio::buffer(&remaining_length16_, 2),
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[this,&remaining_length16_](const boost::system::error_code& ec, std::size_t
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#ifdef CROW_ENABLE_DEBUG
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bytes_transferred
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#endif
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)
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{
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is_reading = false;
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remaining_length16_ = ntohs(remaining_length16_);
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remaining_length_ = remaining_length16_;
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#ifdef CROW_ENABLE_DEBUG
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if (!ec && bytes_transferred != 2)
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{
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throw std::runtime_error("WebSocket:Len16:async_read fail:asio bug?");
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}
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#endif
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if (!ec)
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{
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state_ = WebSocketReadState::Mask;
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do_read();
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}
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else
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{
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close_connection_ = true;
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adaptor_.close();
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if (error_handler_)
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error_handler_(*this);
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check_destroy();
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}
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});
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}
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break;
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case WebSocketReadState::Len64:
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{
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boost::asio::async_read(adaptor_.socket(), boost::asio::buffer(&remaining_length_, 8),
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[this](const boost::system::error_code& ec, std::size_t
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#ifdef CROW_ENABLE_DEBUG
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bytes_transferred
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#endif
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)
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{
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is_reading = false;
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remaining_length_ = ((1==ntohl(1)) ? (remaining_length_) : ((uint64_t)ntohl((remaining_length_) & 0xFFFFFFFF) << 32) | ntohl((remaining_length_) >> 32));
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#ifdef CROW_ENABLE_DEBUG
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if (!ec && bytes_transferred != 8)
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{
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throw std::runtime_error("WebSocket:Len16:async_read fail:asio bug?");
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}
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#endif
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if (!ec)
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{
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state_ = WebSocketReadState::Mask;
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do_read();
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}
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else
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{
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close_connection_ = true;
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adaptor_.close();
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if (error_handler_)
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error_handler_(*this);
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check_destroy();
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}
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});
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}
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break;
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case WebSocketReadState::Mask:
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boost::asio::async_read(adaptor_.socket(), boost::asio::buffer((char*)&mask_, 4),
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[this](const boost::system::error_code& ec, std::size_t
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#ifdef CROW_ENABLE_DEBUG
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bytes_transferred
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#endif
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)
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{
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is_reading = false;
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#ifdef CROW_ENABLE_DEBUG
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if (!ec && bytes_transferred != 4)
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{
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throw std::runtime_error("WebSocket:Mask:async_read fail:asio bug?");
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}
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#endif
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if (!ec)
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{
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state_ = WebSocketReadState::Payload;
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do_read();
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}
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else
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{
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close_connection_ = true;
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if (error_handler_)
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error_handler_(*this);
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adaptor_.close();
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}
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});
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break;
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case WebSocketReadState::Payload:
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{
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size_t to_read = buffer_.size();
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if (remaining_length_ < to_read)
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to_read = remaining_length_;
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adaptor_.socket().async_read_some( boost::asio::buffer(buffer_, to_read),
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[this](const boost::system::error_code& ec, std::size_t bytes_transferred)
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{
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is_reading = false;
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if (!ec)
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{
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fragment_.insert(fragment_.end(), buffer_.begin(), buffer_.begin() + bytes_transferred);
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remaining_length_ -= bytes_transferred;
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if (remaining_length_ == 0)
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{
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handle_fragment();
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state_ = WebSocketReadState::MiniHeader;
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do_read();
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}
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}
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else
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{
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close_connection_ = true;
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if (error_handler_)
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error_handler_(*this);
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adaptor_.close();
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}
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});
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}
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break;
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}
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}
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bool is_FIN()
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{
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return mini_header_ & 0x8000;
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}
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int opcode()
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{
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return (mini_header_ & 0x0f00) >> 8;
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}
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void handle_fragment()
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{
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for(decltype(fragment_.length()) i = 0; i < fragment_.length(); i ++)
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{
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fragment_[i] ^= ((char*)&mask_)[i%4];
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}
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switch(opcode())
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{
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case 0: // Continuation
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{
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message_ += fragment_;
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if (is_FIN())
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{
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if (message_handler_)
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message_handler_(*this, message_, is_binary_);
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message_.clear();
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}
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}
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case 1: // Text
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{
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is_binary_ = false;
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message_ += fragment_;
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if (is_FIN())
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{
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if (message_handler_)
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message_handler_(*this, message_, is_binary_);
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message_.clear();
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}
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}
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break;
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case 2: // Binary
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{
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is_binary_ = true;
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message_ += fragment_;
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if (is_FIN())
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{
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if (message_handler_)
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message_handler_(*this, message_, is_binary_);
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message_.clear();
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}
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}
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break;
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case 0x8: // Close
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{
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has_recv_close_ = true;
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if (!has_sent_close_)
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{
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close(fragment_);
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}
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else
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{
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adaptor_.close();
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close_connection_ = true;
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if (!is_close_handler_called_)
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{
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if (close_handler_)
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close_handler_(*this, fragment_);
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is_close_handler_called_ = true;
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}
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check_destroy();
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}
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}
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break;
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case 0x9: // Ping
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{
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send_pong(fragment_);
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}
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break;
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case 0xA: // Pong
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{
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pong_received_ = true;
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}
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break;
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}
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fragment_.clear();
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}
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void do_write()
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{
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if (sending_buffers_.empty())
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{
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sending_buffers_.swap(write_buffers_);
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std::vector<boost::asio::const_buffer> buffers;
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buffers.reserve(sending_buffers_.size());
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for(auto& s:sending_buffers_)
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{
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buffers.emplace_back(boost::asio::buffer(s));
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}
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boost::asio::async_write(adaptor_.socket(), buffers,
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[&](const boost::system::error_code& ec, std::size_t /*bytes_transferred*/)
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{
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sending_buffers_.clear();
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if (!ec && !close_connection_)
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{
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if (!write_buffers_.empty())
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do_write();
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if (has_sent_close_)
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close_connection_ = true;
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}
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else
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{
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close_connection_ = true;
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check_destroy();
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}
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});
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}
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}
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void check_destroy()
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{
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//if (has_sent_close_ && has_recv_close_)
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if (!is_close_handler_called_)
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if (close_handler_)
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close_handler_(*this, "uncleanly");
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if (sending_buffers_.empty() && !is_reading)
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delete this;
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}
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private:
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Adaptor adaptor_;
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std::vector<std::string> sending_buffers_;
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std::vector<std::string> write_buffers_;
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boost::array<char, 4096> buffer_;
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bool is_binary_;
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std::string message_;
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std::string fragment_;
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WebSocketReadState state_{WebSocketReadState::MiniHeader};
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uint64_t remaining_length_{0};
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bool close_connection_{false};
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bool is_reading{false};
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uint32_t mask_;
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uint16_t mini_header_;
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bool has_sent_close_{false};
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bool has_recv_close_{false};
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bool error_occured_{false};
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bool pong_received_{false};
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bool is_close_handler_called_{false};
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std::function<void(crow::websocket::connection&)> open_handler_;
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std::function<void(crow::websocket::connection&, const std::string&, bool)> message_handler_;
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std::function<void(crow::websocket::connection&, const std::string&)> close_handler_;
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std::function<void(crow::websocket::connection&)> error_handler_;
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std::function<bool(const crow::request&)> accept_handler_;
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};
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}
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}
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