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// Copyright 2014 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 EXTENSIONS_RENDERER_MESSAGING_BINDINGS_H_
#define EXTENSIONS_RENDERER_MESSAGING_BINDINGS_H_
#include <string>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "extensions/renderer/object_backed_native_handler.h"
namespace extensions {
class ExtensionPort;
class ScriptContext;
struct PortId;
// Manually implements JavaScript bindings for extension messaging.
class MessagingBindings : public ObjectBackedNativeHandler {
public:
explicit MessagingBindings(ScriptContext* script_context);
~MessagingBindings() override;
// ObjectBackedNativeHandler:
void AddRoutes() override;
// Returns the MessagingBindings associated with the given |context|.
static MessagingBindings* ForContext(ScriptContext* context);
// Returns an existing port with the given |id|, or null.
ExtensionPort* GetPortWithId(const PortId& id);
// Creates a new port with the given |id|. MessagingBindings owns the
// returned port.
ExtensionPort* CreateNewPortWithId(const PortId& id);
private:
using PortMap = std::map<int, std::unique_ptr<ExtensionPort>>;
// JS Exposed Function: Sends a message along the given channel. If an error
// occurs, returns the error, else returns nothing.
void PostMessage(const v8::FunctionCallbackInfo<v8::Value>& args);
// JS Exposed Function: Close a port, optionally forcefully (i.e. close the
// whole channel instead of just the given port).
void CloseChannel(const v8::FunctionCallbackInfo<v8::Value>& args);
// JS Exposed Function: Binds |callback| to be invoked *sometime after*
// |object| is garbage collected. We don't call the method re-entrantly so as
// to avoid executing JS in some bizarro undefined mid-GC state, nor do we
// then call into the script context if it's been invalidated.
void BindToGC(const v8::FunctionCallbackInfo<v8::Value>& args);
// JS Exposed Function: Opens a new channel to an extension.
void OpenChannelToExtension(const v8::FunctionCallbackInfo<v8::Value>& args);
// JS Exposed Function: Opens a new channel to a native application.
void OpenChannelToNativeApp(const v8::FunctionCallbackInfo<v8::Value>& args);
// JS Exposed Function: Opens a new channel to a tab.
void OpenChannelToTab(const v8::FunctionCallbackInfo<v8::Value>& args);
// Helper function to close a port. See CloseChannel() for |force_close|
// documentation.
void ClosePort(int local_port_id, bool force_close);
int GetNextJsId();
// Active ports, mapped by local port id.
PortMap ports_;
// The next available js id for a port.
size_t next_js_id_ = 0;
// The number of extension ports created.
size_t num_extension_ports_ = 0;
base::WeakPtrFactory<MessagingBindings> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(MessagingBindings);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_MESSAGING_BINDINGS_H_
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