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// 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.
#ifndef CHROME_RENDERER_EXTENSIONS_EXTENSION_BASE_H_
#define CHROME_RENDERER_EXTENSIONS_EXTENSION_BASE_H_
#pragma once
#include "base/logging.h"
#include "v8/include/v8.h"
#include <string>
class Extension;
class ExtensionDispatcher;
class RenderView;
namespace WebKit {
class WebFrame;
}
// This is a base class for chrome extension bindings. Common features that
// are shared by different modules go here.
class ExtensionBase : public v8::Extension {
public:
static const char* GetStringResource(int resource_id);
ExtensionBase(const char* name,
const char* source,
int dep_count,
const char** deps,
ExtensionDispatcher* extension_dispatcher)
: v8::Extension(name, source, dep_count, deps),
extension_dispatcher_(extension_dispatcher) {
}
// Derived classes should call this at the end of their implementation in
// order to expose common native functions, like GetChromeHidden, to the
// v8 extension.
virtual v8::Handle<v8::FunctionTemplate>
GetNativeFunction(v8::Handle<v8::String> name);
// TODO(jstritar): Used for testing http://crbug.com/91582. Remove when done.
ExtensionDispatcher* extension_dispatcher() { return extension_dispatcher_; }
// Returns a hidden variable for use by the bindings in the specified context
// that is unreachable by the page for the current context.
static v8::Handle<v8::Value> GetChromeHidden(
const v8::Handle<v8::Context>& context);
protected:
template<class T>
static T* GetFromArguments(const v8::Arguments& args) {
CHECK(!args.Data().IsEmpty());
T* result = static_cast<T*>(args.Data().As<v8::External>()->Value());
return result;
}
// Gets the render view for the current v8 context.
static RenderView* GetCurrentRenderView();
// Note: do not call this function before or during the chromeHidden.onLoad
// event dispatch. The URL might not have been committed yet and might not
// be an extension URL.
const ::Extension* GetExtensionForCurrentRenderView() const;
// Checks that the current context contains an extension that has permission
// to execute the specified function. If it does not, a v8 exception is thrown
// and the method returns false. Otherwise returns true.
bool CheckPermissionForCurrentRenderView(
const std::string& function_name) const;
// Returns the chromeHidden object for the current context.
static v8::Handle<v8::Value> GetChromeHidden(const v8::Arguments& args);
ExtensionDispatcher* extension_dispatcher_;
private:
// Helper to print from bindings javascript.
static v8::Handle<v8::Value> Print(const v8::Arguments& args);
};
#endif // CHROME_RENDERER_EXTENSIONS_EXTENSION_BASE_H_
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