From f44d36b05e43cabde31aeaba5d25fded140345a1 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Fri, 27 Jan 2023 19:42:08 +0100
Subject: Added diff.cpp

---
 whiteboard.cpp | 55 ++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 7 deletions(-)

(limited to 'whiteboard.cpp')

diff --git a/whiteboard.cpp b/whiteboard.cpp
index b15ebbe..df18242 100644
--- a/whiteboard.cpp
+++ b/whiteboard.cpp
@@ -34,6 +34,7 @@
 
 #include <fmt/core.h>
 
+#include "libreichwein/base64.h"
 #include "libreichwein/file.h"
 
 #include "config.h"
@@ -89,11 +90,12 @@ std::string make_xml(const std::initializer_list<std::pair<std::string, std::str
 
  std::ostringstream oss;
  // write_xml_element instead of write_xml to omit <!xml...> header
+ //pt::xml_parser::write_xml(oss, xml);
  pt::xml_parser::write_xml_element(oss, {}, xml, -1, boost::property_tree::xml_writer_settings<pt::ptree::key_type>{});
  return oss.str();
 }
 
-void Whiteboard::notify_other_connections(Whiteboard::connection& c, const std::string& id)
+void Whiteboard::notify_other_connections_file(Whiteboard::connection& c, const std::string& id)
 {
  std::for_each(m_registry.begin(id), m_registry.end(id), [&](const Whiteboard::connection& ci)
                {
@@ -103,13 +105,34 @@ void Whiteboard::notify_other_connections(Whiteboard::connection& c, const std::
                    {"type", "getfile"},
                    {"data", m_storage->getDocument(id)},
                    {"revision", std::to_string(m_storage->getRevision(id)) },
-                   {"cursorpos", std::to_string(m_storage->getCursorPos(id)) }
+                   {"pos", std::to_string(m_storage->getCursorPos(id)) }
                    });
                  std::lock_guard<std::mutex> lock(m_websocket_mutex);
                  try {
                   ci->write(buffer.data());
                  } catch (const std::exception& ex) {
-                  std::cerr << "Warning: Notify write for " << ci << " not possible, id " << id << std::endl;
+                  std::cerr << "Warning: Notify getfile write for " << ci << " not possible, id " << id << std::endl;
+                  m_registry.dump();
+                 }
+                }
+               });
+}
+
+void Whiteboard::notify_other_connections_pos(Whiteboard::connection& c, const std::string& id)
+{
+ std::for_each(m_registry.begin(id), m_registry.end(id), [&](const Whiteboard::connection& ci)
+               {
+                if (c != ci) {
+                 boost::beast::flat_buffer buffer;
+                 boost::beast::ostream(buffer) << make_xml({
+                   {"type", "getpos"},
+                   {"pos", std::to_string(m_storage->getCursorPos(id)) }
+                   });
+                 std::lock_guard<std::mutex> lock(m_websocket_mutex);
+                 try {
+                  ci->write(buffer.data());
+                 } catch (const std::exception& ex) {
+                  std::cerr << "Warning: Notify getpos write for " << ci << " not possible, id " << id << std::endl;
                   m_registry.dump();
                  }
                 }
@@ -135,7 +158,13 @@ std::string Whiteboard::handle_request(Whiteboard::connection& c, const std::str
    if (m_storage->getDocument(id) != data) {
     m_storage->setDocument(id, data);
     m_registry.setId(c, id);
-    notify_other_connections(c, id);
+    notify_other_connections_file(c, id);
+    
+    int pos {xml.get<int>("request.pos")};
+    if (m_storage->getCursorPos(id) != pos) {
+     m_storage->setCursorPos(id, pos);
+     notify_other_connections_pos(c, id);
+    }
     return make_xml({{"type", "modify"}, {"revision", std::to_string(m_storage->getRevision(id)) }});
    }
    return {};
@@ -144,7 +173,7 @@ std::string Whiteboard::handle_request(Whiteboard::connection& c, const std::str
    int pos {xml.get<int>("request.pos")};
    if (m_storage->getCursorPos(id) != pos) {
     m_storage->setCursorPos(id, pos);
-    notify_other_connections(c, id);
+    notify_other_connections_pos(c, id);
    }
    return {};
   } else if (command == "getfile") {
@@ -165,7 +194,14 @@ std::string Whiteboard::handle_request(Whiteboard::connection& c, const std::str
                    {"type", "getfile"},
                    {"data", filedata},
                    {"revision", std::to_string(m_storage->getRevision(id)) },
-                   {"cursorpos", std::to_string(m_storage->getCursorPos(id)) }
+                   {"pos", std::to_string(m_storage->getCursorPos(id)) }
+                   }); 
+  } else if (command == "getpos") {
+   std::string id {xml.get<std::string>("request.id")};
+
+   return make_xml({
+                   {"type", "getpos"},
+                   {"pos", std::to_string(m_storage->getCursorPos(id)) }
                    }); 
   } else if (command == "newid") {
    return make_xml({{"type", "newid"}, {"id", m_storage->generate_id()}}); 
@@ -177,7 +213,12 @@ std::string Whiteboard::handle_request(Whiteboard::connection& c, const std::str
 
    std::string pngdata {QRCode::getQRCode(url)};
 
-   return make_xml({{"type", "qrcode"}, {"png", pngdata}}); 
+   return make_xml({{"type", "qrcode"}, {"png", Reichwein::Base64::encode64(pngdata)}});
+  } else if (command == "getversion") {
+   return make_xml({
+                   {"type", "version"},
+                   {"version", WHITEBOARD_VERSION }
+                   }); 
   } else {
    throw std::runtime_error("Bad command: "s + command);
   }
-- 
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