From d747193e76baf689211d9f1e42335360288d43c0 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Mon, 9 Jan 2023 10:38:29 +0100
Subject: First websockets test via https

---
 https.cpp | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)

(limited to 'https.cpp')

diff --git a/https.cpp b/https.cpp
index 523acb5..ccf14d7 100644
--- a/https.cpp
+++ b/https.cpp
@@ -12,6 +12,9 @@
 #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>
 #ifdef BOOST_LATEST
@@ -41,6 +44,7 @@ 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;
 
@@ -82,6 +86,111 @@ void fail(
     std::cerr << what << ": " << ec.message() << "\n";
 }
 
+class websocket_session: public std::enable_shared_from_this<websocket_session>
+{
+ websocket::stream<beast::ssl_stream<beast::tcp_stream>> ws_;
+ beast::flat_buffer buffer_;
+
+public:
+ explicit websocket_session(beast::ssl_stream<beast::tcp_stream>&& stream) :
+  ws_(std::move(stream))
+ {
+ }
+
+    // Start the asynchronous accept operation
+    template<class Body, class Allocator>
+    void
+    do_accept(http::request<Body, http::basic_fields<Allocator>> req)
+    {
+        // Set suggested timeout settings for the websocket
+        ws_.set_option(
+            websocket::stream_base::timeout::suggested(
+                beast::role_type::server));
+
+        // Set a decorator to change the Server of the handshake
+        ws_.set_option(websocket::stream_base::decorator(
+            [](websocket::response_type& res)
+            {
+                res.set(http::field::server,
+                    std::string{"Reichwein.IT Webserver"});
+            }));
+
+        // Accept the websocket handshake
+        ws_.async_accept(
+            req,
+            beast::bind_front_handler(
+                &websocket_session::on_accept,
+                shared_from_this()));
+    }
+
+private:
+    void
+    on_accept(beast::error_code ec)
+    {
+        if(ec)
+            return fail(ec, "accept");
+
+        // Read a message
+        do_read();
+    }
+
+    void
+    do_read()
+    {
+        // Read a message into our buffer
+        ws_.async_read(
+            buffer_,
+            beast::bind_front_handler(
+                &websocket_session::on_read,
+                shared_from_this()));
+    }
+
+    void
+    on_read(
+        beast::error_code ec,
+        std::size_t bytes_transferred)
+    {
+        boost::ignore_unused(bytes_transferred);
+
+        // This indicates that the websocket_session was closed
+        if(ec == websocket::error::closed)
+            return;
+
+        if(ec)
+            fail(ec, "read");
+
+        // Echo the message
+        ws_.text(ws_.got_text());
+        std::string data(boost::asio::buffers_begin(buffer_.data()), boost::asio::buffers_end(buffer_.data()));
+        static int count{};
+        data += ": " + std::to_string(count++);
+        buffer_.consume(buffer_.size());
+        boost::beast::ostream(buffer_) << data;
+        ws_.async_write(
+            buffer_.data(),
+            beast::bind_front_handler(
+                &websocket_session::on_write,
+                shared_from_this()));
+    }
+
+    void
+    on_write(
+        beast::error_code ec,
+        std::size_t bytes_transferred)
+    {
+        boost::ignore_unused(bytes_transferred);
+
+        if(ec)
+            return fail(ec, "write");
+
+        // Clear the buffer
+        buffer_.consume(buffer_.size());
+
+        // Do another read
+        do_read();
+    }
+};
+
 // Handles an HTTP server connection
 class session : public std::enable_shared_from_this<session>
 {
@@ -265,6 +374,13 @@ public:
             return fail(ec, "https read");
 
         req_ = parser_->get();
+
+        if (websocket::is_upgrade(req_))
+        {
+         beast::get_lowest_layer(stream_).expires_never();
+         std::make_shared<websocket_session>(std::move(stream_))->do_accept(parser_->release());
+         return;
+        }
         
         // Send the response
         handle_request(m_server, std::move(req_));
-- 
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