From 2bb0d2ab46bf8104ab6e0b96fdefbeb20aa4c9e4 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Thu, 12 Jan 2023 15:50:15 +0100
Subject: Move https.* to http.*

---
 http.cpp | 463 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 463 insertions(+)
 create mode 100644 http.cpp

(limited to 'http.cpp')

diff --git a/http.cpp b/http.cpp
new file mode 100644
index 0000000..868e739
--- /dev/null
+++ b/http.cpp
@@ -0,0 +1,463 @@
+#include "http.h"
+
+#include "config.h"
+#include "error.h"
+#include "server.h"
+#include "response.h"
+#include "websocket.h"
+
+#include <openssl/ssl.h>
+#include <openssl/crypto.h>
+
+#include <boost/asio/buffer.hpp>
+#include <boost/beast/core.hpp>
+#include <boost/beast/http.hpp>
+#include <boost/beast/websocket.hpp>
+#include <boost/beast/websocket/ssl.hpp>
+#include <boost/asio/buffers_iterator.hpp>
+#include <boost/asio/dispatch.hpp>
+#include <boost/asio/ssl/context.hpp>
+#include <boost/beast/ssl.hpp>
+#include <boost/asio/strand.hpp>
+#include <boost/config.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdlib>
+#include <filesystem>
+#include <functional>
+#include <iostream>
+#include <memory>
+#include <optional>
+#include <string>
+#include <thread>
+#include <vector>
+
+namespace fs = std::filesystem;
+namespace beast = boost::beast;         // from <boost/beast.hpp>
+namespace http = beast::http;           // from <boost/beast/http.hpp>
+namespace net = boost::asio;            // from <boost/asio.hpp>
+namespace ssl = boost::asio::ssl;       // from <boost/asio/ssl.hpp>
+namespace websocket = beast::websocket;
+using tcp = boost::asio::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
+using namespace Reichwein;
+
+namespace {
+
+// Handles an HTTP server connection
+template<class Derived>
+class session
+{
+private:
+ Derived& derived()
+ {
+  return static_cast<Derived&>(*this);
+ }
+
+ boost::asio::io_context& ioc_;
+ beast::flat_buffer buffer_;
+ Server& server_;
+ std::optional<http::request_parser<http::string_body>> parser_; // need to reset parser every time, no other mechanism currently
+ request_type req_;
+ std::shared_ptr<response_type> res_;
+
+ void handle_request()
+ {
+  beast::get_lowest_layer(derived().stream()).expires_after(std::chrono::seconds(300)); // timeout on write by server much longer than read timeout from client
+  auto sp = std::make_shared<response_type>(response::generate_response(req_, server_));
+
+  res_ = sp;
+
+  // Write the response
+  http::async_write(
+      derived().stream(),
+      *sp,
+      beast::bind_front_handler(
+          &session::on_write,
+          derived().shared_from_this(),
+          sp->need_eof()));
+ }
+
+ void handle_websocket()
+ {
+  beast::get_lowest_layer(derived().stream()).expires_never();
+  make_websocket_session(ioc_, std::move(derived().stream()), response::get_websocket_address(req_, server_), parser_->release());
+ }
+
+public:
+ explicit
+ session(
+     boost::asio::io_context& ioc,
+     Server& server):
+      ioc_(ioc),
+      server_(server)
+ {
+ }
+
+ // Start the asynchronous operation
+ void
+ run()
+ {
+  // We need to be executing within a strand to perform async operations
+  // on the I/O objects in this session.
+  net::dispatch(
+      derived().stream().get_executor(),
+      beast::bind_front_handler(
+          &Derived::on_run,
+          derived().shared_from_this()));
+ }
+
+ void
+ do_read()
+ {
+  // Make the request empty before reading,
+  // otherwise the operation behavior is undefined.
+  req_ = {};
+ 
+  // this is the way to reset the parser. it's necessary.
+  // https://github.com/boostorg/beast/issues/927
+  parser_.emplace();
+  parser_->body_limit(1000000000); // 1GB limit
+
+  // Set the timeout.
+  beast::get_lowest_layer(derived().stream()).expires_after(std::chrono::seconds(30));
+
+  // Read a request
+  http::async_read(derived().stream(), buffer_, *parser_,
+      beast::bind_front_handler(
+          &session::on_read,
+          derived().shared_from_this()));
+ }
+
+ void
+ on_read(
+     beast::error_code ec,
+     std::size_t bytes_transferred)
+ {
+  boost::ignore_unused(bytes_transferred);
+
+  // This means they closed the connection
+  if (ec == http::error::end_of_stream)
+   return derived().do_close();
+
+  if (ec == http::error::partial_message)
+   return; // ignore
+
+  if (ec)
+   return fail(ec, "http read");
+
+  req_ = parser_->get();
+
+  if (websocket::is_upgrade(req_))
+  {
+   handle_websocket();
+   return;
+  }
+  
+  // Send the response
+  handle_request();
+ }
+
+ void
+ on_write(
+     bool close,
+     beast::error_code ec,
+     std::size_t bytes_transferred
+     )
+ {
+  boost::ignore_unused(bytes_transferred);
+
+  if (ec)
+   return fail(ec, "http write");
+
+  if (close)
+  {
+   // This means we should close the connection, usually because
+   // the response indicated the "Connection: close" semantic.
+   return derived().do_close();
+  }
+
+  // We're done with the response so delete it
+  res_ = nullptr;
+
+  // Read another request
+  do_read();
+ }
+
+};
+
+class plain_session:
+ public session<plain_session>,
+ public std::enable_shared_from_this<plain_session>
+{
+ beast::tcp_stream stream_;
+
+public:
+ explicit plain_session(
+     boost::asio::io_context& ioc,
+     tcp::socket&& socket,
+     Server& server):
+  session(ioc, server),
+  stream_(std::move(socket))
+ {
+ }
+ 
+ void on_run()
+ {
+  // We need to be executing within a strand to perform async operations
+  // on the I/O objects in this session. Skip ssl handshake for plain http.
+  net::dispatch(stream_.get_executor(),
+		beast::bind_front_handler(
+		    &session::do_read,
+		    shared_from_this()));
+ }
+
+ void
+ do_close()
+ {
+  // Send a TCP shutdown
+  beast::error_code ec;
+  stream_.socket().shutdown(tcp::socket::shutdown_send, ec);
+  // At this point the connection is closed gracefully
+ }
+
+ beast::tcp_stream& stream()
+ {
+  return stream_;
+ }
+
+}; // class
+
+class ssl_session:
+ public session<ssl_session>,
+ public std::enable_shared_from_this<ssl_session>
+{
+ beast::ssl_stream<beast::tcp_stream> stream_;
+public:
+ explicit ssl_session(
+     boost::asio::io_context& ioc,
+     tcp::socket&& socket,
+     ssl::context& ctx,
+     Server& server):
+  session(ioc, server),
+  stream_(std::move(socket), ctx)
+ {
+ }
+ 
+ void on_run()
+ {
+  // Set the timeout
+  beast::get_lowest_layer(stream_).expires_after(
+      std::chrono::seconds(30));
+
+  // Perform the SSL handshake
+  stream_.async_handshake(
+      ssl::stream_base::server,
+      beast::bind_front_handler(
+	  &ssl_session::on_handshake,
+	  shared_from_this()));
+ }
+
+ void
+ on_handshake(beast::error_code ec)
+ {
+  if (ec)
+   return fail(ec, "https handshake");
+
+  do_read();
+ }
+
+ void
+ do_close()
+ {
+  // Set the timeout.
+  beast::get_lowest_layer(stream_).expires_after(std::chrono::seconds(30));
+
+  // Perform the SSL shutdown
+  stream_.async_shutdown(
+      beast::bind_front_handler(
+          &ssl_session::on_shutdown,
+          shared_from_this()));
+ }
+
+ void
+ on_shutdown(beast::error_code ec)
+ {
+  if (ec)
+   return fail(ec, "https shutdown");
+
+  // At this point the connection is closed gracefully
+ }
+
+ beast::ssl_stream<beast::tcp_stream>& stream()
+ {
+  return stream_;
+ }
+
+}; // class
+
+// Accepts incoming connections and launches the sessions
+template<class Derived> 
+class listener
+{
+private:
+ Derived& derived()
+ {
+  return static_cast<Derived&>(*this);
+ }
+    
+protected:
+ net::io_context& ioc_;
+ tcp::acceptor acceptor_;
+ ::Server& server_;
+
+public:
+ explicit listener(
+        net::io_context& ioc,
+        tcp::endpoint endpoint,
+        Server& server):
+        ioc_(ioc),
+        acceptor_(ioc),
+        server_(server)
+ {
+  beast::error_code ec;
+
+  // Open the acceptor
+  acceptor_.open(endpoint.protocol(), ec);
+  if (ec)
+  {
+   fail(ec, "http listener open");
+   return;
+  }
+
+  // Allow address reuse
+  acceptor_.set_option(net::socket_base::reuse_address(true), ec);
+  if (ec)
+  {
+   fail(ec, "http listener set_option");
+   return;
+  }
+
+  // Bind to the server address
+  acceptor_.bind(endpoint, ec);
+  if (ec)
+  {
+   fail(ec, "http listener bind");
+   return;
+  }
+
+  // Start listening for connections
+  acceptor_.listen(net::socket_base::max_listen_connections, ec);
+  if (ec)
+  {
+   fail(ec, "http listener listen");
+   return;
+  }
+ }
+
+ // Start accepting incoming connections
+ void
+ run()
+ {
+  do_accept();
+ }
+
+protected:
+ void
+ do_accept()
+ {
+  // The new connection gets its own strand
+  acceptor_.async_accept(
+      net::make_strand(ioc_),
+      beast::bind_front_handler(
+          &Derived::on_accept,
+          derived().shared_from_this()));
+ }
+}; // class
+
+class plain_listener:
+ public listener<plain_listener>,
+ public std::enable_shared_from_this<plain_listener>
+{
+public:
+ explicit plain_listener(
+     net::io_context& ioc,
+     tcp::endpoint endpoint,
+     Server& server):
+     listener(ioc, endpoint, server)
+ {
+ }
+
+ void
+ on_accept(beast::error_code ec, tcp::socket socket)
+ {
+  if (ec) {
+   fail(ec, "plain listener accept");
+  } else {
+   // Create the session and run it
+   std::make_shared<plain_session>(
+       ioc_,
+       std::move(socket),
+       server_)->run();
+  }
+
+  // Accept another connection
+  do_accept();
+ }
+}; // class
+
+class ssl_listener:
+ public listener<ssl_listener>,
+ public std::enable_shared_from_this<ssl_listener>
+{
+ ssl::context& ctx_;
+
+public:
+ explicit ssl_listener(
+     net::io_context& ioc,
+     ssl::context& ctx,
+     tcp::endpoint endpoint,
+     Server& server):
+     listener(ioc, endpoint, server),
+     ctx_(ctx)
+ {
+ }
+
+ void
+ on_accept(beast::error_code ec, tcp::socket socket)
+ {
+  if (ec) {
+   fail(ec, "ssl listener accept");
+  } else {
+   // Create the session and run it
+   std::make_shared<ssl_session>(
+       ioc_,
+       std::move(socket),
+       ctx_,
+       server_)->run();
+  }
+
+  // Accept another connection
+  do_accept();
+ }
+}; // class
+
+} // namespace
+
+void make_listener(net::io_context& ioc, net::ip::address address, unsigned short port, Server& server)
+{
+ std::make_shared<plain_listener>(
+  ioc,
+  tcp::endpoint{address, port},
+  server)->run();
+}
+
+void make_listener(net::io_context& ioc, ssl::context& ctx, net::ip::address address, unsigned short port, Server& server)
+{
+ std::make_shared<ssl_listener>(
+  ioc,
+  ctx,
+  tcp::endpoint{address, port},
+  server)->run();
+}
+
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