.gitignore

@@ -30,3 +30,17 @@ libxmlplusplus-prefix/
 spdlog.pc
 build*
 temp*
+#/.idea/codeStyles/codeStyleConfig.xml
+#/.idea/discord.xml
+#/.idea/editor.xml
+#/.idea/larra.iml
+#/.idea/material_theme_project_new.xml
+#/.idea/misc.xml
+#/.idea/modules.xml
+#/.idea/codeStyles/Project.xml
+#/.idea/vcs.xml
+/.idea/
+
+
+
+

library/include/larra/client/client.hpp

@@ -157,6 +157,169 @@ struct StartTlsRequest {
   }
 };
 
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, const HttpProxy& param_proxy, std::string_view host, std::uint16_t port)
+    -> boost::asio::awaitable<void> {
+  constexpr std::string_view kHttpVersion = "HTTP/1.1";
+  constexpr unsigned int kSuccessStatusCode = 200;
+  constexpr std::string_view kEndOfHeaders = "\r\n\r\n";
+  constexpr int kEndOfHttpSubstring = 5;
+  // HTTP CONNECT запрос
+  std::string request = std::format("CONNECT {}:{} {}\r\nHost: {}:{}\r\n\r\n", host, port, kHttpVersion, host, port);
+
+  co_await boost::asio::async_write(socket, boost::asio::buffer(request), boost::asio::transfer_all(), boost::asio::use_awaitable);
+
+  // ответ от прокси-сервера
+  boost::asio::streambuf response;
+  std::size_t bytesTransferred = co_await boost::asio::async_read_until(socket, response, kEndOfHeaders, boost::asio::use_awaitable);
+
+  // статус ответа
+  std::istream responseStream(&response);
+  std::string httpVersion;
+  unsigned int statusCode = 0;
+  std::string statusMessage;
+
+  responseStream >> httpVersion >> statusCode;
+  std::getline(responseStream, statusMessage);
+
+  if(!responseStream || httpVersion.substr(0, kEndOfHttpSubstring) != "HTTP/") {
+    throw std::runtime_error("Invalid HTTP response from proxy");
+  }
+
+  if(statusCode != kSuccessStatusCode) {
+    std::ostringstream errorStream;
+    errorStream << httpVersion << " " << statusCode << " " << statusMessage;
+    throw std::runtime_error("HTTP proxy CONNECT failed: " + errorStream.str());
+  }
+
+  co_return;
+}
+
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, Socks5Proxy& socksProxy, std::string_view address, std::uint16_t port)
+    -> boost::asio::awaitable<void> {
+  constexpr std::array kSocks5RequestStart = {std::byte{0x05}, std::byte{0x01}, std::byte{0x00}, std::byte{0x03}};
+
+  constexpr std::size_t kSocks5RequestMaxSize = 257;
+
+  constexpr std::size_t kSocks5ReplyTypeSize = 10;
+
+  constexpr std::array kHandshakeRequest{std::byte{0x05}, std::byte{0x01}, std::byte{0x00}};
+
+  std::array<std::byte, 2> handshakeResponse;  // NOLINT
+
+  co_await boost::asio::async_write(
+      socket, boost::asio::buffer(kHandshakeRequest), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  co_await boost::asio::async_read(socket, boost::asio::buffer(handshakeResponse), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  if(handshakeResponse[0] != std::byte{0x05} || handshakeResponse[1] != std::byte{0x00}) {  // NOLINT
+    throw std::exception{};
+  };
+  const auto [connectRequest, size] = [&] {
+    const auto size = static_cast<std::byte>(address.size());
+    const auto htonsPort = std::bit_cast<std::array<std::byte, 2>>(htons(port));
+    auto range = std::array{std::span{kSocks5RequestStart.begin(), kSocks5RequestStart.size()},
+                            std::span{&size, 1},
+                            std::span{utils::StartLifetimeAsArray<const std::byte>(address.data(), address.size()), address.size()},
+                            std::span{htonsPort.data(), 2}} |
+                 std::views::join;
+    std::array<std::byte, kSocks5RequestMaxSize> response;  // NOLINT
+    auto sizee = std::ranges::copy(range, response.begin()).out - response.begin();
+    return std::pair{response, sizee};
+  }();
+  co_await boost::asio::async_write(
+      socket, boost::asio::buffer(connectRequest.begin(), size), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  std::array<std::byte, kSocks5ReplyTypeSize> connectReplyType;  // NOLINT
+  co_await boost::asio::async_read(socket, boost::asio::buffer(connectReplyType), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  if(connectReplyType[1] != std::byte{0x00}) {
+    throw std::exception{};
+  };
+  co_return;
+}
+
+template <typename ProxyType>
+auto GetProxySettings(const char* proxyEnv, std::uint16_t port) -> Proxy {
+  std::string_view rawProxyStr = proxyEnv;
+
+  const std::size_t protocolNamePos = rawProxyStr.find("://");
+  std::string_view proxyStr = protocolNamePos == std::string_view::npos ? rawProxyStr : rawProxyStr.substr(protocolNamePos + 3);
+
+  const std::size_t portPos = proxyStr.find(':');
+
+  if(portPos == std::string_view::npos) {
+    return ProxyType{std::string(proxyStr), port};
+  }
+  auto host = std::string(proxyStr.substr(0, portPos));
+  auto portStr = proxyStr.substr(portPos + 1);
+  auto portOpt = ToInt<uint16_t>(portStr);
+
+  if(!portOpt) {
+    throw std::runtime_error("Invalid port number in proxy settings");
+  }
+  return ProxyType{host, portOpt.value()};
+}
+
+inline auto GetSystemProxySettings() -> Proxy {
+  if(const char* proxyEnv = std::getenv("http_proxy")) {
+    constexpr std::uint16_t kHttpPort = 8080;
+    return GetProxySettings<HttpProxy>(proxyEnv, kHttpPort);
+  }
+  if(const char* proxy_env = std::getenv("socks_proxy")) {
+    constexpr std::uint16_t kSocksPort = 1080;
+    return GetProxySettings<Socks5Proxy>(proxy_env, kSocksPort);
+  }
+
+  return NoProxy{};
+}
+
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, const SystemConfiguredProxy&, std::string_view host, std::uint16_t port)
+    -> boost::asio::awaitable<void> {
+  auto proxy_opt = GetSystemProxySettings();
+
+  co_await std::visit(
+      [&](auto&& proxy_variant) -> boost::asio::awaitable<void> {
+        co_await ConnectViaProxy(socket, proxy_variant, host, port);
+      },
+      proxy_opt);
+}
+
+template <typename Socket, typename ProxyType>
+auto ConnectToServer(Socket& socket, const ProxyType& proxy, std::string_view host, std::uint16_t port) -> boost::asio::awaitable<void> {
+  auto executor = co_await boost::asio::this_coro::executor;
+  boost::asio::ip::tcp::resolver resolver(executor);
+  auto endpoints = co_await resolver.async_resolve(proxy.hostname, std::to_string(proxy.port), boost::asio::use_awaitable);
+  co_await boost::asio::async_connect(socket, endpoints, boost::asio::use_awaitable);
+
+  if constexpr(!std::same_as<ProxyType, NoProxy>) {
+    co_await ConnectViaProxy(socket, proxy, host, port);
+  }
+}
+
+template <typename Socket>
+auto ConnectToServer(Socket& socket, const SystemConfiguredProxy& proxy, std::string_view host, std::uint16_t port)
+    -> boost::asio::awaitable<void> {
+  auto executor = co_await boost::asio::this_coro::executor;
+  boost::asio::ip::tcp::resolver resolver(executor);
+  auto endpoints = co_await resolver.async_resolve(host, std::to_string(port), boost::asio::use_awaitable);
+  co_await boost::asio::async_connect(socket, endpoints, boost::asio::use_awaitable);
+
+  co_await ConnectViaProxy(socket, proxy, host, port);
+}
+
+template <typename Socket>
+auto ConnectWithProxy(Socket& socket, const Proxy& proxy, std::string_view host, std::uint16_t port) -> boost::asio::awaitable<void> {
+  auto awaitable = std::visit(
+      [&socket, host, port](const auto& proxy_variant) {
+        return ConnectToServer(socket, proxy_variant, host, port);
+      },
+      proxy);
+  co_await awaitable;
+}
+
+inline auto GetAuthData(const PlainUserAccount& account) -> std::string {
+  return EncodeBase64('\0' + account.jid.username + '\0' + account.password);
+}
+
 struct ClientCreateVisitor {
   UserAccount account;
   const Options& options;

tests/proxy.cpp

@@ -0,0 +1,114 @@
+#include <gtest/gtest.h>
+
+#include <larra/client/client.hpp>
+#include <larra/impl/mock_socket.hpp>
+#include <larra/proxy.hpp>
+
+using namespace larra::xmpp;
+using boost::asio::ip::tcp;
+namespace asio = boost::asio;
+
+class ProxyTest : public ::testing::Test {
+ protected:
+  boost::asio::io_context io_context;
+  larra::xmpp::impl::MockSocket mock_socket{io_context.get_executor()};
+};
+
+// Test 1: Connect via HTTP proxy with successful server response
+TEST_F(ProxyTest, ConnectViaHttpProxy_SuccessfulResponse) {
+  HttpProxy proxy{"proxy_host", 8080};
+
+  std::string targetHost = "target_host";
+  uint16_t targetPort = 80;
+
+  std::string expectedRequest =
+      std::format("CONNECT {}:{} HTTP/1.1\r\nHost: {}:{}\r\n\r\n", targetHost, targetPort, targetHost, targetPort);
+
+  std::string proxyResponse = "HTTP/1.1 200 Connection established\r\n\r\n";
+
+  mock_socket.AddReceivedData(proxyResponse);
+
+  bool connectSuccessful = false;
+
+  asio::co_spawn(
+      io_context,
+      [&]() -> asio::awaitable<void> {
+        try {
+          co_await client::impl::ConnectViaProxy(mock_socket, proxy, targetHost, targetPort);
+          connectSuccessful = true;
+        } catch(...) {
+          connectSuccessful = false;
+        }
+      },
+      asio::detached);
+
+  io_context.run();
+
+  std::string sentData = mock_socket.GetSentData();
+
+  EXPECT_EQ(sentData, expectedRequest);
+  EXPECT_TRUE(connectSuccessful);
+}
+
+// Test 2: Connect via SOCKS proxy
+TEST(Socks5ProxyTest, ConnectViaProxy) {
+  constexpr std::uint16_t kSocksPort = 1080;
+  constexpr std::uint16_t kAvailableUdpBufferSpaceForSocks = 262;
+
+  boost::asio::io_context io;
+  auto executor = io.get_executor();
+
+  larra::xmpp::impl::MockSocket socket{executor};
+
+  std::string expectedServerResponse;
+  expectedServerResponse += "\x05\x00";          // VER, METHOD
+  expectedServerResponse += "\x05\x00\x00\x01";  // VER, REP, RSV, ATYP (IPv4)
+  expectedServerResponse += "\x7F\x00\x00\x01";  // BND.ADDR (127.0.0.1)
+  expectedServerResponse += "\x1F\x90";          // BND.PORT (8080)
+
+  socket.AddReceivedData(expectedServerResponse);
+
+  Socks5Proxy proxy{.hostname = "proxy.example.com", .port = kSocksPort};
+  std::string targetHostname = "target.example.com";
+  std::uint16_t targetPort = 80;
+
+  boost::asio::co_spawn(
+      executor,
+      [&]() -> boost::asio::awaitable<void> {
+        co_await client::impl::ConnectViaProxy(socket, proxy, targetHostname, targetPort);
+
+        auto sentData = socket.GetSentData();
+
+        std::string expectedGreeting = "\x05\x01\x00";
+
+        std::array<std::uint8_t, kAvailableUdpBufferSpaceForSocks> expectedRequest{};
+        std::size_t req_len = 0;
+
+        expectedRequest[req_len++] = 0x05;  // VER
+        expectedRequest[req_len++] = 0x01;  // CMD: CONNECT
+        expectedRequest[req_len++] = 0x00;  // RSV
+        expectedRequest[req_len++] = 0x03;  // ATYP: DOMAINNAME
+
+        expectedRequest[req_len++] = static_cast<std::uint8_t>(targetHostname.size());  // domain length
+
+        std::memcpy(&expectedRequest[req_len], targetHostname.data(), targetHostname.size());
+        req_len += targetHostname.size();
+
+        std::uint16_t networkOrderPort = htons(targetPort);
+        expectedRequest[req_len++] = static_cast<std::uint8_t>((networkOrderPort >> 8) & 0xFF);
+        expectedRequest[req_len++] = static_cast<std::uint8_t>(networkOrderPort & 0xFF);
+
+        std::string expectedData = expectedGreeting;
+        auto transformed_view = expectedRequest | std::views::take(req_len) | std::views::transform([](std::uint8_t byte) {
+                                  return static_cast<char>(byte);
+                                });
+
+        expectedData.append(std::ranges::to<std::string>(transformed_view));
+        EXPECT_EQ(sentData, expectedData);
+
+        co_return;
+      },
+      boost::asio::detached);
+
+  io.run();
+}