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// Copyright 2012 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 "content/renderer/web_ui_extension.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
#include "content/common/view_messages.h"
#include "content/public/common/bindings_policy.h"
#include "content/public/common/url_constants.h"
#include "content/public/renderer/render_thread.h"
#include "content/public/renderer/render_view.h"
#include "content/public/renderer/v8_value_converter.h"
#include "content/renderer/web_ui_extension_data.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "url/gurl.h"
#include "v8/include/v8.h"
namespace content {
static const char* const kWebUIExtensionName = "v8/WebUI";
// Javascript that gets executed when the extension loads into all frames.
// Exposes two methods:
// - chrome.send: Used to send messages to the browser. Requires the message
// name as the first argument and can have an optional second argument that
// should be an array.
// - chrome.getVariableValue: Returns value for the input variable name if such
// a value was set by the browser. Else will return an empty string.
static const char* const kWebUIExtensionJS =
"var chrome;"
"if (!chrome)"
" chrome = {};"
"chrome.send = function(name, data) {"
" native function Send();"
" Send(name, data);"
"};"
"chrome.getVariableValue = function(name) {"
" native function GetVariableValue();"
" return GetVariableValue(name);"
"};";
class WebUIExtensionWrapper : public v8::Extension {
public:
WebUIExtensionWrapper();
virtual ~WebUIExtensionWrapper();
virtual v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
v8::Isolate* isolate,
v8::Handle<v8::String> name) OVERRIDE;
static void Send(const v8::FunctionCallbackInfo<v8::Value>& args);
static void GetVariableValue(const v8::FunctionCallbackInfo<v8::Value>& args);
private:
static bool ShouldRespondToRequest(blink::WebFrame** frame_ptr,
RenderView** render_view_ptr);
DISALLOW_COPY_AND_ASSIGN(WebUIExtensionWrapper);
};
WebUIExtensionWrapper::WebUIExtensionWrapper()
: v8::Extension(kWebUIExtensionName, kWebUIExtensionJS) {}
WebUIExtensionWrapper::~WebUIExtensionWrapper() {}
v8::Handle<v8::FunctionTemplate>
WebUIExtensionWrapper::GetNativeFunctionTemplate(v8::Isolate* isolate,
v8::Handle<v8::String> name) {
if (name->Equals(v8::String::NewFromUtf8(isolate, "Send")))
return v8::FunctionTemplate::New(isolate, Send);
if (name->Equals(v8::String::NewFromUtf8(isolate, "GetVariableValue")))
return v8::FunctionTemplate::New(isolate, GetVariableValue);
return v8::Handle<v8::FunctionTemplate>();
}
// static
bool WebUIExtensionWrapper::ShouldRespondToRequest(
blink::WebFrame** frame_ptr,
RenderView** render_view_ptr) {
blink::WebFrame* frame = blink::WebFrame::frameForCurrentContext();
if (!frame || !frame->view())
return false;
RenderView* render_view = RenderView::FromWebView(frame->view());
if (!render_view)
return false;
GURL frame_url = frame->document().url();
bool webui_enabled =
(render_view->GetEnabledBindings() & BINDINGS_POLICY_WEB_UI) &&
(frame_url.SchemeIs(kChromeUIScheme) ||
frame_url.SchemeIs(kDataScheme));
if (!webui_enabled)
return false;
*frame_ptr = frame;
*render_view_ptr = render_view;
return true;
}
// static
void WebUIExtensionWrapper::Send(
const v8::FunctionCallbackInfo<v8::Value>& args) {
blink::WebFrame* frame;
RenderView* render_view;
if (!ShouldRespondToRequest(&frame, &render_view))
return;
// We expect at least two parameters - a string message identifier, and
// an object parameter. The object param can be undefined.
if (args.Length() != 2 || !args[0]->IsString())
return;
const std::string message = *v8::String::Utf8Value(args[0]->ToString());
// If they've provided an optional message parameter, convert that into a
// Value to send to the browser process.
scoped_ptr<base::ListValue> content;
if (args[1]->IsUndefined()) {
content.reset(new base::ListValue());
} else {
if (!args[1]->IsObject())
return;
scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
base::Value* value = converter->FromV8Value(
args[1], frame->mainWorldScriptContext());
base::ListValue* list = NULL;
value->GetAsList(&list);
DCHECK(list);
content.reset(list);
}
// Send the message up to the browser.
render_view->Send(new ViewHostMsg_WebUISend(render_view->GetRoutingID(),
frame->document().url(),
message,
*content));
}
// static
void WebUIExtensionWrapper::GetVariableValue(
const v8::FunctionCallbackInfo<v8::Value>& args) {
blink::WebFrame* frame;
RenderView* render_view;
if (!ShouldRespondToRequest(&frame, &render_view))
return;
if (!args.Length() || !args[0]->IsString())
return;
std::string key = *v8::String::Utf8Value(args[0]->ToString());
std::string value = WebUIExtensionData::Get(render_view)->GetValue(key);
args.GetReturnValue().Set(v8::String::NewFromUtf8(args.GetIsolate(),
value.c_str(),
v8::String::kNormalString,
value.length()));
}
// static
v8::Extension* WebUIExtension::Get() {
return new WebUIExtensionWrapper();
}
} // namespace content
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