[feat] implement file transfer module

src/gui/panels/remote_peer_panel.cpp

@@ -207,6 +207,7 @@ int Render::ConnectTo(const std::string& remote_id, const char* password,
         }
         AddAudioStream(props->peer_, props->audio_label_.c_str());
         AddDataStream(props->peer_, props->data_label_.c_str());
+        AddDataStream(props->peer_, props->file_label_.c_str());
 
         props->connection_status_ = ConnectionStatus::Connecting;
 

src/gui/render.cpp

@@ -714,6 +714,7 @@ int Render::CreateConnectionPeer() {
 
     AddAudioStream(peer_, audio_label_.c_str());
     AddDataStream(peer_, data_label_.c_str());
+    AddDataStream(peer_, file_label_.c_str());
     return 0;
   } else {
     return -1;

src/gui/render.h

@@ -45,6 +45,7 @@ class Render {
     PeerPtr* peer_ = nullptr;
     std::string audio_label_ = "control_audio";
     std::string data_label_ = "control_data";
+    std::string file_label_ = "file";
     std::string local_id_ = "";
     std::string remote_id_ = "";
     bool exit_ = false;
@@ -464,6 +465,7 @@ class Render {
   std::string video_secondary_label_ = "secondary_display";
   std::string audio_label_ = "audio";
   std::string data_label_ = "data";
+  std::string file_label_ = "file";
   Params params_;
   SDL_AudioDeviceID input_dev_;
   SDL_AudioDeviceID output_dev_;

src/gui/render_callback.cpp

@@ -1,7 +1,11 @@
+#include <chrono>
 #include <cmath>
+#include <cstdlib>
+#include <filesystem>
 #include <fstream>
 
 #include "device_controller.h"
+#include "file_transfer.h"
 #include "localization.h"
 #include "platform.h"
 #include "rd_log.h"
@@ -304,6 +308,12 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
     return;
   }
 
+  // try to parse as file-transfer chunk first
+  static FileReceiver receiver;
+  if (receiver.OnData(data, size)) {
+    return;
+  }
+
   std::string json_str(data, size);
   RemoteAction remote_action;
 
@@ -485,12 +495,12 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
         render->need_to_send_host_info_ = true;
         render->start_screen_capturer_ = true;
         render->start_speaker_capturer_ = true;
-        // #ifdef CROSSDESK_DEBUG
+#ifdef CROSSDESK_DEBUG
         render->start_mouse_controller_ = false;
         render->start_keyboard_capturer_ = false;
-        // #else
+#else
         render->start_mouse_controller_ = true;
-        // #endif
+#endif
         if (std::all_of(render->connection_status_.begin(),
                         render->connection_status_.end(), [](const auto& kv) {
                           return kv.first.find("web") != std::string::npos;

src/gui/toolbars/control_bar.cpp

@@ -1,3 +1,9 @@
+#include <filesystem>
+#include <fstream>
+#include <thread>
+#include <vector>
+
+#include "file_transfer.h"
 #include "layout.h"
 #include "localization.h"
 #include "rd_log.h"
@@ -197,6 +203,27 @@ int Render::ControlBar(std::shared_ptr<SubStreamWindowProperties>& props) {
       std::string path = OpenFileDialog(title);
       if (!path.empty()) {
         LOG_INFO("Selected file: {}", path.c_str());
+
+        // Send selected file over file data channel in a background thread.
+        auto peer = props->peer_;
+        std::filesystem::path file_path = std::filesystem::path(path);
+        std::string file_label = file_label_;
+
+        std::thread([peer, file_path, file_label]() {
+          FileSender sender;
+          int ret = sender.SendFile(
+              file_path, file_path.filename().string(),
+              [peer, file_label](const char* buf, size_t sz) -> int {
+                return SendDataFrame(peer, buf, sz, file_label.c_str(), true);
+              });
+
+          if (ret != 0) {
+            LOG_ERROR("FileSender::SendFile failed for [{}], ret={}",
+                      file_path.string().c_str(), ret);
+          } else {
+            LOG_INFO("File send finished: {}", file_path.string().c_str());
+          }
+        }).detach();
       }
     }