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// Copyright (c) 2009 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/renderer/extensions/renderer_extension_bindings.h"
#include "app/resource_bundle.h"
#include "base/basictypes.h"
#include "base/values.h"
#include "chrome/common/render_messages.h"
#include "chrome/renderer/extensions/bindings_utils.h"
#include "chrome/renderer/extensions/event_bindings.h"
#include "chrome/renderer/render_thread.h"
#include "chrome/renderer/render_view.h"
#include "grit/renderer_resources.h"
using bindings_utils::GetStringResource;
using bindings_utils::ExtensionBase;
// Message passing API example (in a content script):
// var extension =
// new chrome.Extension('00123456789abcdef0123456789abcdef0123456');
// var port = extension.connect();
// port.postMessage('Can you hear me now?');
// port.onmessage.addListener(function(msg, port) {
// alert('response=' + msg);
// port.postMessage('I got your reponse');
// });
namespace {
const char* kExtensionDeps[] = { EventBindings::kName };
class ExtensionImpl : public ExtensionBase {
public:
ExtensionImpl()
: ExtensionBase(RendererExtensionBindings::kName,
GetStringResource<IDR_RENDERER_EXTENSION_BINDINGS_JS>(),
arraysize(kExtensionDeps), kExtensionDeps) {
}
~ExtensionImpl() {}
virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
v8::Handle<v8::String> name) {
if (name->Equals(v8::String::New("OpenChannelToExtension"))) {
return v8::FunctionTemplate::New(OpenChannelToExtension);
} else if (name->Equals(v8::String::New("PostMessage"))) {
return v8::FunctionTemplate::New(PostMessage);
} else if (name->Equals(v8::String::New("CloseChannel"))) {
return v8::FunctionTemplate::New(CloseChannel);
}
return ExtensionBase::GetNativeFunction(name);
}
// Creates a new messaging channel to the given extension.
static v8::Handle<v8::Value> OpenChannelToExtension(
const v8::Arguments& args) {
// Get the current RenderView so that we can send a routed IPC message from
// the correct source.
RenderView* renderview = bindings_utils::GetRenderViewForCurrentContext();
if (!renderview)
return v8::Undefined();
if (args.Length() >= 2 && args[0]->IsString() && args[1]->IsString()) {
std::string id = *v8::String::Utf8Value(args[0]->ToString());
std::string channel_name = *v8::String::Utf8Value(args[1]->ToString());
int port_id = -1;
renderview->Send(new ViewHostMsg_OpenChannelToExtension(
renderview->routing_id(), id, channel_name, &port_id));
return v8::Integer::New(port_id);
}
return v8::Undefined();
}
// Sends a message along the given channel.
static v8::Handle<v8::Value> PostMessage(const v8::Arguments& args) {
RenderView* renderview = bindings_utils::GetRenderViewForCurrentContext();
if (!renderview)
return v8::Undefined();
if (args.Length() >= 2 && args[0]->IsInt32() && args[1]->IsString()) {
int port_id = args[0]->Int32Value();
std::string message = *v8::String::Utf8Value(args[1]->ToString());
renderview->Send(new ViewHostMsg_ExtensionPostMessage(
renderview->routing_id(), port_id, message));
}
return v8::Undefined();
}
// Sends a message along the given channel.
static v8::Handle<v8::Value> CloseChannel(const v8::Arguments& args) {
if (args.Length() >= 1 && args[0]->IsInt32()) {
int port_id = args[0]->Int32Value();
// Send via the RenderThread because the RenderView might be closing.
EventBindings::GetRenderThread()->Send(
new ViewHostMsg_ExtensionCloseChannel(port_id));
}
return v8::Undefined();
}
};
// Convert a ListValue to a vector of V8 values.
static std::vector< v8::Handle<v8::Value> > ListValueToV8(
const ListValue& value) {
std::vector< v8::Handle<v8::Value> > v8_values;
for (size_t i = 0; i < value.GetSize(); ++i) {
Value* elem = NULL;
value.Get(i, &elem);
switch (elem->GetType()) {
case Value::TYPE_NULL:
v8_values.push_back(v8::Null());
break;
case Value::TYPE_BOOLEAN: {
bool val;
elem->GetAsBoolean(&val);
v8_values.push_back(v8::Boolean::New(val));
break;
}
case Value::TYPE_INTEGER: {
int val;
elem->GetAsInteger(&val);
v8_values.push_back(v8::Integer::New(val));
break;
}
case Value::TYPE_REAL: {
double val;
elem->GetAsReal(&val);
v8_values.push_back(v8::Number::New(val));
break;
}
case Value::TYPE_STRING: {
std::string val;
elem->GetAsString(&val);
v8_values.push_back(v8::String::New(val.c_str()));
break;
}
default:
NOTREACHED() << "Unsupported Value type.";
break;
}
}
return v8_values;
}
} // namespace
const char* RendererExtensionBindings::kName =
"chrome/RendererExtensionBindings";
v8::Extension* RendererExtensionBindings::Get() {
return new ExtensionImpl();
}
void RendererExtensionBindings::Invoke(const std::string& function_name,
const ListValue& args) {
v8::HandleScope handle_scope;
std::vector< v8::Handle<v8::Value> > argv = ListValueToV8(args);
EventBindings::CallFunction(function_name, argv.size(), &argv[0]);
}
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