Add launcher code for plugin support (#93)

* rpc

* RPC

* Undoing broken shit

* temp

* Revert "temp"

This reverts commit 4875b5aca2b0d6b03183d220120c03df28759a95.

* Include a whole bunch of new stuff

* fix id

* Added manifest and added some verification

* Fixed my oopsies

* Safety commit

* Moved over to new plugin abi

* Small docs changes and made plugin loading use ABI_VERSION

* Moving discord rpc plugin stuff to a separate repo

* Add some comments to `plugins.cpp`

* Moved internal structs from `plugin_abi.h` to `plugins.cpp`

* Add CLA `-noplugins`

* Code formatting changes so clang-format doesn't scream at me

* i hate clang-format

* why does this fail to build now wtf

* Update plugins.cpp

* Merged and updated to new convar system

* Implemented changes requested in review

* Removed a few more of those nasty comments

* Removed extra build configs

Co-authored-by: BobTheBob <32057864+BobTheBob9@users.noreply.github.com>

1 files changed, 112 insertions, 0 deletions

diff --git a/NorthstarDedicatedTest/dllmain.cpp b/NorthstarDedicatedTest/dllmain.cpp
index dcff9f4a..d6bc5091 100644
--- a/NorthstarDedicatedTest/dllmain.cpp
+++ b/NorthstarDedicatedTest/dllmain.cpp
@@ -39,6 +39,15 @@
 #include "localchatwriter.h"
 #include <string.h>
 #include "pch.h"
+#include "plugin_abi.h"
+#include "plugins.h"
+
+#include "rapidjson/document.h"
+#include "rapidjson/stringbuffer.h"
+#include "rapidjson/writer.h"
+#include "rapidjson/error/en.h"
+
+typedef void (*initPluginFuncPtr)(void* getPluginObject);
 
 bool initialised = false;
 
@@ -68,6 +77,108 @@ void WaitForDebugger(HMODULE baseAddress)
 	}
 }
 
+void freeLibrary(HMODULE hLib)
+{
+	if (!FreeLibrary(hLib))
+	{
+		spdlog::error("There was an error while trying to free library");
+	}
+}
+
+bool LoadPlugins()
+{
+
+	std::vector<fs::path> paths;
+
+	std::string pluginPath = GetNorthstarPrefix() + "/plugins";
+
+	// ensure dirs exist
+	fs::recursive_directory_iterator iterator(pluginPath);
+	if (std::filesystem::begin(iterator) == std::filesystem::end(iterator))
+	{
+		spdlog::warn("Could not find any plugins. Skipped loading plugins");
+		return false;
+	}
+	for (auto const& entry : iterator)
+	{
+		if (fs::is_regular_file(entry) && entry.path().extension() == ".dll")
+			paths.emplace_back(entry.path().filename());
+	}
+	// system("pause");
+	initGameState();
+	// spdlog::info("Loading the following DLLs in plugins folder:");
+	for (fs::path path : paths)
+	{
+		std::string pathstring = (pluginPath / path).string();
+		std::wstring wpath = (pluginPath / path).wstring();
+
+		LPCWSTR wpptr = wpath.c_str();
+		HMODULE datafile =
+			LoadLibraryExW(wpptr, 0, LOAD_LIBRARY_AS_DATAFILE | LOAD_LIBRARY_AS_IMAGE_RESOURCE); // Load the DLL as a data file
+		if (datafile == NULL)
+		{
+			spdlog::info("Failed to load library {}: ", std::system_category().message(GetLastError()));
+			continue;
+		}
+		HRSRC manifestResource = FindResourceW(datafile, MAKEINTRESOURCE(101), MAKEINTRESOURCE(RT_RCDATA));
+
+		if (manifestResource == NULL)
+		{
+			spdlog::info("Could not find manifest for library {}", pathstring);
+			freeLibrary(datafile);
+			continue;
+		}
+		spdlog::info("Loading resource from library");
+		HGLOBAL myResourceData = LoadResource(datafile, manifestResource);
+		if (myResourceData == NULL)
+		{
+			spdlog::error("Failed to load resource from library");
+			freeLibrary(datafile);
+			continue;
+		}
+		int manifestSize = SizeofResource(datafile, manifestResource);
+		std::string manifest = std::string((const char*)LockResource(myResourceData), 0, manifestSize);
+		freeLibrary(datafile);
+
+		rapidjson_document manifestJSON;
+		manifestJSON.Parse(manifest.c_str());
+
+		if (manifestJSON.HasParseError())
+		{
+			spdlog::error("Manifest for {} was invalid", pathstring);
+			continue;
+		}
+		if (!manifestJSON.HasMember("api_version"))
+		{
+			spdlog::error("{} does not have a version number in its manifest", pathstring);
+			continue;
+			// spdlog::info(manifestJSON["version"].GetString());
+		}
+		if (strcmp(manifestJSON["api_version"].GetString(), std::to_string(ABI_VERSION).c_str()))
+		{
+			spdlog::error("{} has an incompatible API version number in its manifest", pathstring);
+			continue;
+		}
+		// Passed all checks, going to actually load it now
+
+		HMODULE pluginLib = LoadLibraryW(wpptr); // Load the DLL as a data file
+		if (pluginLib == NULL)
+		{
+			spdlog::info("Failed to load library {}: ", std::system_category().message(GetLastError()));
+			continue;
+		}
+		initPluginFuncPtr initPlugin = (initPluginFuncPtr)GetProcAddress(pluginLib, "initializePlugin");
+		if (initPlugin == NULL)
+		{
+			spdlog::info("Library {} has no function initializePlugin", pathstring);
+			continue;
+		}
+		spdlog::info("Succesfully loaded {}", pathstring);
+		initPlugin(&getPluginObject);
+	}
+	return true;
+}
+
 bool InitialiseNorthstar()
 {
 	if (initialised)
@@ -123,6 +234,7 @@ bool InitialiseNorthstar()
 		AddDllLoadCallback("client.dll", InitialiseScriptMainMenuPromos);
 		AddDllLoadCallback("client.dll", InitialiseMiscClientFixes);
 		AddDllLoadCallback("client.dll", InitialiseClientPrintHooks);
+		AddDllLoadCallback("client.dll", InitialisePluginCommands);
 		AddDllLoadCallback("client.dll", InitialiseClientChatHooks);
 		AddDllLoadCallback("client.dll", InitialiseLocalChatWriter);
 	}