Move GnomeKeyringLoader to components/os_crypt

components/os_crypt/keyring_util_linux.cc

Index: components/os_crypt/keyring_util_linux.cc
diff --git a/components/os_crypt/keyring_util_linux.cc b/components/os_crypt/keyring_util_linux.cc
new file mode 100644
index 0000000000000000000000000000000000000000..300a344b985516953eea0d940a7592c5b15a8c37
--- /dev/null
+++ b/components/os_crypt/keyring_util_linux.cc
@@ -0,0 +1,82 @@
+// 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/keyring_util_linux.h"
+
+#include <dlfcn.h>
+
+#include "base/logging.h"
+
+decltype(&::gnome_keyring_is_available)
+    GnomeKeyringLoader::gnome_keyring_is_available_ptr;
+decltype(&::gnome_keyring_store_password)
+    GnomeKeyringLoader::gnome_keyring_store_password_ptr;
+decltype(&::gnome_keyring_delete_password)
+    GnomeKeyringLoader::gnome_keyring_delete_password_ptr;
+decltype(&::gnome_keyring_find_items)
+    GnomeKeyringLoader::gnome_keyring_find_items_ptr;
+decltype(&::gnome_keyring_result_to_message)
+    GnomeKeyringLoader::gnome_keyring_result_to_message_ptr;
+decltype(&::gnome_keyring_attribute_list_free)
+    GnomeKeyringLoader::gnome_keyring_attribute_list_free_ptr;
+decltype(&::gnome_keyring_attribute_list_new)
+    GnomeKeyringLoader::gnome_keyring_attribute_list_new_ptr;
+decltype(&::gnome_keyring_attribute_list_append_string)
+    GnomeKeyringLoader::gnome_keyring_attribute_list_append_string_ptr;
+decltype(&::gnome_keyring_attribute_list_append_uint32)
+    GnomeKeyringLoader::gnome_keyring_attribute_list_append_uint32_ptr;
+
+bool GnomeKeyringLoader::keyring_loaded = false;
+
+const GnomeKeyringLoader::FunctionInfo GnomeKeyringLoader::functions[] = {
+    {"gnome_keyring_is_available",
+     reinterpret_cast<void**>(&gnome_keyring_is_available_ptr)},
+    {"gnome_keyring_store_password",
+     reinterpret_cast<void**>(&gnome_keyring_store_password_ptr)},
+    {"gnome_keyring_delete_password",
+     reinterpret_cast<void**>(&gnome_keyring_delete_password_ptr)},
+    {"gnome_keyring_find_items",
+     reinterpret_cast<void**>(&gnome_keyring_find_items_ptr)},
+    {"gnome_keyring_result_to_message",
+     reinterpret_cast<void**>(&gnome_keyring_result_to_message_ptr)},
+    {"gnome_keyring_attribute_list_free",
+     reinterpret_cast<void**>(&gnome_keyring_attribute_list_free_ptr)},
+    {"gnome_keyring_attribute_list_new",
+     reinterpret_cast<void**>(&gnome_keyring_attribute_list_new_ptr)},
+    {"gnome_keyring_attribute_list_append_string",
+     reinterpret_cast<void**>(&gnome_keyring_attribute_list_append_string_ptr)},
+    {"gnome_keyring_attribute_list_append_uint32",
+     reinterpret_cast<void**>(
+         &gnome_keyring_attribute_list_append_uint32_ptr)}};
+
+/* Load the library and initialize the function pointers. */
+bool GnomeKeyringLoader::LoadGnomeKeyring() {
+  if (keyring_loaded)
+    return true;
+
+  void* handle = dlopen("libgnome-keyring.so.0", RTLD_NOW | RTLD_GLOBAL);
+  if (!handle) {
+    // We wanted to use GNOME Keyring, but we couldn't load it. Warn, because
+    // either the user asked for this, or we autodetected it incorrectly. (Or
+    // the system has broken libraries, which is also good to warn about.)
+    LOG(WARNING) << "Could not load libgnome-keyring.so.0: " << dlerror();
+    return false;
+  }
+
+  for (size_t i = 0; i < arraysize(functions); ++i) {
+    dlerror();
+    *functions[i].pointer = dlsym(handle, functions[i].name);
+    const char* error = dlerror();
+    if (error) {
+      LOG(ERROR) << "Unable to load symbol " << functions[i].name << ": "
+                 << error;
+      dlclose(handle);
+      return false;
+    }
+  }
+
+  keyring_loaded = true;
+  // We leak the library handle. That's OK: this function is called only once.
+  return true;
+}