UICommon: Add AutoUpdate module + placeholder Qt implementation

The AutoUpdate module is a generic update checker mechanism which can be
used by UI backends to trigger an auto-update check as well as the
actual update process.

Currently only configurable through .ini and the Qt implementation is
completely placeholder-y -- blocking the main thread on a network
request on startup, etc.

1 files changed, 139 insertions, 0 deletions

diff --git a/Source/Core/UICommon/AutoUpdate.cpp b/Source/Core/UICommon/AutoUpdate.cpp
new file mode 100644
index 0000000000..3313b706fd
--- /dev/null
+++ b/Source/Core/UICommon/AutoUpdate.cpp
@@ -0,0 +1,139 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "UICommon/AutoUpdate.h"
+
+#include <picojson/picojson.h>
+
+#include "Common/CommonPaths.h"
+#include "Common/FileUtil.h"
+#include "Common/HttpRequest.h"
+#include "Common/Logging/Log.h"
+#include "Common/StringUtil.h"
+#include "Common/scmrev.h"
+#include "Core/ConfigManager.h"
+
+#ifdef _WIN32
+#include <Windows.h>
+#endif
+
+namespace
+{
+bool SystemSupportsAutoUpdates()
+{
+#ifdef _WIN32
+  return true;
+#else
+  return false;
+#endif
+}
+
+#ifdef _WIN32
+
+const char UPDATER_FILENAME[] = "Updater.exe";
+const char UPDATER_RELOC_FILENAME[] = "Updater.2.exe";
+const char UPDATER_LOG_FILE[] = "Updater.log";
+
+std::wstring MakeUpdaterCommandLine(const std::map<std::string, std::string>& flags)
+{
+  std::wstring cmdline = UTF8ToUTF16(UPDATER_FILENAME) + L" ";  // Start with a fake argv[0].
+  for (const auto& pair : flags)
+  {
+    std::string value = "--" + pair.first + "=" + pair.second;
+    value = ReplaceAll(value, "\"", "\\\"");  // Escape double quotes.
+    value = "\"" + value + "\" ";
+    cmdline += UTF8ToUTF16(value);
+  }
+  return cmdline;
+}
+
+// Used to remove the relocated updater file once we don't need it anymore.
+void CleanupFromPreviousUpdate()
+{
+  std::string reloc_updater_path = File::GetExeDirectory() + DIR_SEP + UPDATER_RELOC_FILENAME;
+  File::Delete(reloc_updater_path);
+}
+#endif
+}  // namespace
+
+void AutoUpdateChecker::CheckForUpdate()
+{
+  // Don't bother checking if updates are not supported or not enabled.
+  if (SConfig::GetInstance().m_auto_update_track.empty() || !SystemSupportsAutoUpdates())
+    return;
+
+#ifdef _WIN32
+  CleanupFromPreviousUpdate();
+#endif
+
+  std::string version_hash = SConfig::GetInstance().m_auto_update_hash_override.empty() ?
+                                 SCM_REV_STR :
+                                 SConfig::GetInstance().m_auto_update_hash_override;
+  std::string url = "https://dolphin-emu.org/update/check/v0/" +
+                    SConfig::GetInstance().m_auto_update_track + "/" + version_hash;
+
+  Common::HttpRequest req{std::chrono::seconds{10}};
+  auto resp = req.Get(url);
+  if (!resp)
+  {
+    ERROR_LOG(COMMON, "Auto-update request failed");
+    return;
+  }
+  std::string contents(reinterpret_cast<char*>(resp->data()), resp->size());
+  INFO_LOG(COMMON, "Auto-update JSON response: %s", contents.c_str());
+
+  picojson::value json;
+  std::string err = picojson::parse(json, contents);
+  if (!err.empty())
+  {
+    ERROR_LOG(COMMON, "Invalid JSON received from auto-update service: %s", err.c_str());
+    return;
+  }
+  picojson::object obj = json.get<picojson::object>();
+
+  if (obj["status"].get<std::string>() != "outdated")
+  {
+    INFO_LOG(COMMON, "Auto-update status: we are up to date.");
+    return;
+  }
+
+  NewVersionInformation nvi;
+  nvi.this_manifest_url = obj["old"].get<picojson::object>()["manifest"].get<std::string>();
+  nvi.next_manifest_url = obj["new"].get<picojson::object>()["manifest"].get<std::string>();
+  nvi.content_store_url = obj["content-store"].get<std::string>();
+  nvi.new_shortrev = obj["new"].get<picojson::object>()["name"].get<std::string>();
+  nvi.new_hash = obj["new"].get<picojson::object>()["hash"].get<std::string>();
+  // TODO: generate the HTML changelog from the JSON information.
+  OnUpdateAvailable(nvi);
+}
+
+void AutoUpdateChecker::TriggerUpdate(const AutoUpdateChecker::NewVersionInformation& info)
+{
+#ifdef _WIN32
+  std::map<std::string, std::string> updater_flags;
+  updater_flags["this-manifest-url"] = info.this_manifest_url;
+  updater_flags["next-manifest-url"] = info.next_manifest_url;
+  updater_flags["content-store-url"] = info.content_store_url;
+  updater_flags["parent-pid"] = std::to_string(GetCurrentProcessId());
+  updater_flags["install-base-path"] = File::GetExeDirectory();
+  updater_flags["log-file"] = File::GetExeDirectory() + DIR_SEP + UPDATER_LOG_FILE;
+
+  // Copy the updater so it can update itself if needed.
+  std::string updater_path = File::GetExeDirectory() + DIR_SEP + UPDATER_FILENAME;
+  std::string reloc_updater_path = File::GetExeDirectory() + DIR_SEP + UPDATER_RELOC_FILENAME;
+  File::Copy(updater_path, reloc_updater_path);
+
+  // Run the updater!
+  std::wstring command_line = MakeUpdaterCommandLine(updater_flags);
+  STARTUPINFO sinfo = {sizeof(info)};
+  PROCESS_INFORMATION pinfo;
+  INFO_LOG(COMMON, "Updater command line: %s", UTF16ToUTF8(command_line).c_str());
+  if (!CreateProcessW(UTF8ToUTF16(reloc_updater_path).c_str(),
+                      const_cast<wchar_t*>(command_line.c_str()), nullptr, nullptr, FALSE, 0,
+                      nullptr, nullptr, &sinfo, &pinfo))
+  {
+    ERROR_LOG(COMMON, "Could not start updater process: error=%d", GetLastError());
+  }
+#endif
+}