Forward password-store switch to OSCrypt component

components/os_crypt/key_storage_linux.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/os_crypt/key_storage_linux.h"
 
+#include <string.h>
+
+#include "base/environment.h"
+#include "base/logging.h"
+#include "base/nix/xdg_util.h"
+
+#if defined(USE_LIBSECRET)
 #include "components/os_crypt/key_storage_libsecret.h"
+#endif  // defined(USE_LIBSECRET)

[Lei Zhang, 2016/07/12 19:12:24]

Personally, I'm kind of meh about the match comment when it's only a few lines.
Same inchrome/browser/chrome_browser_main_linux.cc. When it gets to 20+ lines
and there's risk of not being able to see the matching #if, or if there are
nested #ifs, then the comments are very helpful.

[cfroussios, 2016/07/13 09:33:10]

Done.

+
+base::LazyInstance<std::string> g_store_ = LAZY_INSTANCE_INITIALIZER;
+
+// static
+void KeyStorageLinux::SetStore(const std::string& store_type) {
+  g_store_.Get() = store_type;
+  VLOG(1) << "OSCrypt store set to " << store_type;
+}
 
 // static
 std::unique_ptr<KeyStorageLinux> KeyStorageLinux::CreateService() {
-  std::unique_ptr<KeyStorageLinux> key_storage(new KeyStorageLibsecret());
+  base::nix::DesktopEnvironment used_desktop_env;
+  if (g_store_.Get() == "kwallet") {
+    used_desktop_env = base::nix::DESKTOP_ENVIRONMENT_KDE4;
+  } else if (g_store_.Get() == "kwallet5") {
+    used_desktop_env = base::nix::DESKTOP_ENVIRONMENT_KDE5;
+  } else if (g_store_.Get() == "gnome") {
+    used_desktop_env = base::nix::DESKTOP_ENVIRONMENT_GNOME;
+  } else if (g_store_.Get() == "basic") {
+    used_desktop_env = base::nix::DESKTOP_ENVIRONMENT_OTHER;
+  } else {
+    std::unique_ptr<base::Environment> env(base::Environment::Create());
+    used_desktop_env = base::nix::GetDesktopEnvironment(env.get());
+  }
 
-  if (key_storage->Init())
-    return key_storage;
+  // Try initializing the appropriate store for our environment.
+  std::unique_ptr<KeyStorageLinux> key_storage;
+  if (used_desktop_env == base::nix::DESKTOP_ENVIRONMENT_GNOME ||
+      used_desktop_env == base::nix::DESKTOP_ENVIRONMENT_UNITY ||
+      used_desktop_env == base::nix::DESKTOP_ENVIRONMENT_XFCE) {
+#if defined(USE_LIBSECRET)
+    key_storage.reset(new KeyStorageLibsecret());
+    if (key_storage->Init()) {
+      VLOG(1) << "OSCrypt using Libsecret as backend.";
+      return key_storage;
+    }
+#endif
+  }
 
+  // The appropriate store was not available.
+  VLOG(1) << "OSCrypt could not initialize a backend.";
   return nullptr;
 }