Enable extension APIs for content scripts.

chrome/common/extensions/api/extension_api.cc

Index: chrome/common/extensions/api/extension_api.cc
diff --git a/chrome/common/extensions/api/extension_api.cc b/chrome/common/extensions/api/extension_api.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3beb13bc7c80ae6e71c2615904617eee9019a776
--- /dev/null
+++ b/chrome/common/extensions/api/extension_api.cc
@@ -0,0 +1,88 @@
+// 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 "chrome/common/extensions/api/extension_api.h"
+
+#include <string>
+#include <vector>
+
+#include "base/json/json_reader.h"
+#include "base/logging.h"
+#include "base/string_split.h"
+#include "base/string_util.h"
+#include "base/values.h"
+#include "grit/common_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace extensions {
+
+// static
+ExtensionAPI* ExtensionAPI::GetInstance() {
+  return Singleton<ExtensionAPI>::get();
+}
+
+ExtensionAPI::ExtensionAPI() {
+  const bool kAllowTrailingCommas = false;
+  std::string error_message;
+  scoped_ptr<Value> temp_value(
+      base::JSONReader::ReadAndReturnError(

[Matt Perry, 2011/11/11 20:07:19]

since this is used in the renderer, doesn't this mean we're now loading/parsing
extension_api.json twice for each process (at least twice, since it's done in JS
for each context)? the file is about 100K so it's not insignificant. do you plan
on getting rid of the parsing from JS contexts somehow?

[Aaron Boodman, 2011/11/11 23:12:02]

In the latest patch, I've changed the place where we use extension_api.json in
JS to cache a single JavaScript object across an entire renderer process.

I'd like to also split apart these gigantic files, but that is a separate task.

[Matt Perry, 2011/11/11 23:35:24]

awesome

+          ResourceBundle::GetSharedInstance().GetRawDataResource(
+              IDR_EXTENSION_API_JSON).as_string(),
+          kAllowTrailingCommas,
+          NULL,  // error code
+          &error_message));
+  CHECK(temp_value.get()) << error_message;
+  CHECK(temp_value->IsType(base::Value::TYPE_LIST))
+      << "Top-level node in extension API is not dictionary";
+
+  value_.reset(static_cast<base::ListValue*>(temp_value.release()));
+}
+
+bool ExtensionAPI::IsFullNameUnprivileged(const std::string& full_name) const {
+  std::vector<std::string> name_space;
+  base::SplitString(full_name, '.', &name_space);
+  std::string name = name_space.back();
+  name_space.pop_back();
+
+  base::DictionaryValue* name_space_node =
+      FindListItem(value_.get(), "namespace", JoinString(name_space, '.'));
+  CHECK(name_space_node);
+
+  return IsChildNameUnprivileged(name_space_node, "functions", name) ||
+      IsChildNameUnprivileged(name_space_node, "events", name);
+}
+
+DictionaryValue* ExtensionAPI::FindListItem(
+    base::ListValue* list,
+    const std::string& property_name,
+    const std::string& property_value) const {
+  for (size_t i = 0; i < list->GetSize(); ++i) {
+    DictionaryValue* item = NULL;
+    CHECK(list->GetDictionary(i, &item));
+    std::string value;
+    if (item->GetString(property_name, &value) && value == property_value)
+      return item;
+  }
+
+  return NULL;
+}
+
+bool ExtensionAPI::IsChildNameUnprivileged(
+    DictionaryValue* name_space_node,
+    const std::string& child_kind,
+    const std::string& child_name) const {
+  ListValue* child_list = NULL;
+  name_space_node->GetList(child_kind, &child_list);
+  if (!child_list)
+    return false;
+
+  bool unprivileged = false;
+  DictionaryValue* child = FindListItem(child_list, "name", child_name);
+  if (!child || !child->GetBoolean("unprivileged", &unprivileged))
+    return false;
+
+  return unprivileged;
+}
+
+}