Implement an initial extension settings API.

chrome/browser/extensions/extension_settings_api.cc

+// Copyright (c) 2011 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 "base/bind.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_settings_api.h"
+#include "chrome/browser/profiles/profile.h"
+
+namespace {
+const char* kUnsupportedArgumentType = "Unsupported argument type";
+}  // namespace
+
+// StorageResultCallback
+
+SettingsFunction::StorageResultCallback::StorageResultCallback(
+    SettingsFunction* settings_function)
+    : settings_function_(settings_function) {
+}
+
+SettingsFunction::StorageResultCallback::~StorageResultCallback() {
+}
+
+void SettingsFunction::StorageResultCallback::OnSuccess(
+    DictionaryValue* settings) {
+  settings_function_->result_.reset(settings);
+  settings_function_->SendResponse(true);
+}
+
+void SettingsFunction::StorageResultCallback::OnFailure(
+    const std::string& message) {
+  settings_function_->error_ = message;
+  settings_function_->SendResponse(false);
+}
+
+// SettingsFunction
+
+bool SettingsFunction::RunImpl() {
+  // Released in RunWithStorage().
+  AddRef();

[Matt Perry, 2011/06/29 18:08:11]

actually I was wrong before - base::Bind does the AddRef/Release for you if you
get rid of the base::Unretained wrapper.

[not at google - send to devlin, 2011/08/03 06:36:51]

Done.

+  profile()->GetExtensionService()->extension_settings()->GetStorage(
+      extension_id(),
+      base::Bind(&SettingsFunction::RunWithStorage, base::Unretained(this)));
+  return true;
+}
+
+void SettingsFunction::RunWithStorage(ExtensionSettingsStorage* storage) {
+  // Mimic how RunImpl() is handled in extensions code.
+  if (!RunWithStorageImpl(storage)) {
+    SendResponse(false);
+  }
+  // Release ref added in RunImpl().
+  Release();
+}
+
+// Concrete settings functions
+
+bool GetSettingsFunction::RunWithStorageImpl(
+    ExtensionSettingsStorage* storage) {
+  Value *input;
+  EXTENSION_FUNCTION_VALIDATE(args_->Get(0, &input));
+
+  std::string as_string;
+  ListValue* as_list;
+  if (input->IsType(Value::TYPE_NULL)) {
+    storage->Get(new StorageResultCallback(this));
+  } else if (input->GetAsString(&as_string)) {
+    storage->Get(as_string, new StorageResultCallback(this));
+  } else if (input->GetAsList(&as_list)) {
+    storage->Get(*as_list, new StorageResultCallback(this));
+  } else {
+    error_ = kUnsupportedArgumentType;
+    return false;
+  }
+
+  return true;
+}
+
+bool SetSettingsFunction::RunWithStorageImpl(
+    ExtensionSettingsStorage* storage) {
+  DictionaryValue *input;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &input));
+  storage->Set(*input, new StorageResultCallback(this));
+  return true;
+}
+
+bool RemoveSettingsFunction::RunWithStorageImpl(
+    ExtensionSettingsStorage* storage) {
+  Value *input;
+  EXTENSION_FUNCTION_VALIDATE(args_->Get(0, &input));
+
+  std::string as_string;
+  ListValue* as_list;
+  if (input->GetAsString(&as_string)) {
+    storage->Remove(as_string, new StorageResultCallback(this));
+  } else if (input->GetAsList(&as_list)) {
+    storage->Remove(*as_list, new StorageResultCallback(this));
+  } else {
+    error_ = kUnsupportedArgumentType;
+    return false;
+  }
+
+  return true;
+}
+
+bool ClearSettingsFunction::RunWithStorageImpl(
+    ExtensionSettingsStorage* storage) {
+  storage->Clear(new StorageResultCallback(this));
+  return true;
+}