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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.
#include "chrome/renderer/extensions/bindings_utils.h"
#include "base/lazy_instance.h"
#include "base/stringprintf.h"
#include "base/string_split.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_set.h"
#include "chrome/renderer/extensions/extension_dispatcher.h"
#include "content/renderer/render_view.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
#include "v8/include/v8.h"
using WebKit::WebFrame;
using WebKit::WebView;
namespace bindings_utils {
const char* kChromeHidden = "chromeHidden";
const char* kValidateCallbacks = "validateCallbacks";
struct SingletonData {
ContextList contexts;
PendingRequestMap pending_requests;
};
static base::LazyInstance<SingletonData> g_singleton_data(
base::LINKER_INITIALIZED);
typedef std::map<int, std::string> StringMap;
static base::LazyInstance<StringMap> g_string_map(base::LINKER_INITIALIZED);
const char* GetStringResource(int resource_id) {
StringMap* strings = g_string_map.Pointer();
StringMap::iterator it = strings->find(resource_id);
if (it == strings->end()) {
it = strings->insert(std::make_pair(
resource_id,
ResourceBundle::GetSharedInstance().GetRawDataResource(
resource_id).as_string())).first;
}
return it->second.c_str();
}
// ExtensionBase
const Extension* ExtensionBase::GetExtensionForCurrentContext() const {
RenderView* renderview = bindings_utils::GetRenderViewForCurrentContext();
if (!renderview)
return NULL; // this can happen as a tab is closing.
GURL url = renderview->webview()->mainFrame()->document().url();
const ExtensionSet* extensions = extension_dispatcher_->extensions();
if (!extensions->ExtensionBindingsAllowed(url))
return NULL;
return extensions->GetByURL(url);
}
bool ExtensionBase::CheckPermissionForCurrentContext(
const std::string& function_name) const {
const ::Extension* extension = GetExtensionForCurrentContext();
if (extension &&
extension_dispatcher_->IsExtensionActive(extension->id()) &&
extension->HasAPIPermission(function_name))
return true;
static const char kMessage[] =
"You do not have permission to use '%s'. Be sure to declare"
" in your manifest what permissions you need.";
std::string error_msg = base::StringPrintf(kMessage, function_name.c_str());
v8::ThrowException(v8::Exception::Error(v8::String::New(error_msg.c_str())));
return false;
}
v8::Handle<v8::FunctionTemplate>
ExtensionBase::GetNativeFunction(v8::Handle<v8::String> name) {
if (name->Equals(v8::String::New("GetChromeHidden"))) {
return v8::FunctionTemplate::New(GetChromeHidden);
}
return v8::Handle<v8::FunctionTemplate>();
}
v8::Handle<v8::Value> ExtensionBase::GetChromeHidden(
const v8::Arguments& args) {
v8::Local<v8::Context> context = v8::Context::GetCurrent();
v8::Local<v8::Object> global = context->Global();
v8::Local<v8::Value> hidden = global->GetHiddenValue(
v8::String::New(kChromeHidden));
if (hidden.IsEmpty() || hidden->IsUndefined()) {
hidden = v8::Object::New();
global->SetHiddenValue(v8::String::New(kChromeHidden), hidden);
#ifndef NDEBUG
// Tell extension_process_bindings.js to validate callbacks and events
// against their schema definitions in api/extension_api.json.
v8::Local<v8::Object>::Cast(hidden)
->Set(v8::String::New(kValidateCallbacks), v8::True());
#endif
}
DCHECK(hidden->IsObject());
return hidden;
}
ContextInfo::ContextInfo(v8::Persistent<v8::Context> context,
const std::string& extension_id,
WebKit::WebFrame* parent_frame,
RenderView* render_view)
: context(context),
extension_id(extension_id),
parent_frame(parent_frame),
render_view(render_view),
num_connected_events(0) {
}
ContextInfo::~ContextInfo() {}
ContextList& GetContexts() {
return g_singleton_data.Get().contexts;
}
ContextList GetContextsForExtension(const std::string& extension_id) {
ContextList& all_contexts = GetContexts();
ContextList contexts;
for (ContextList::iterator it = all_contexts.begin();
it != all_contexts.end(); ++it) {
if ((*it)->extension_id == extension_id)
contexts.push_back(*it);
}
return contexts;
}
ContextInfo* GetInfoForCurrentContext() {
// This can happen in testing scenarios and v8::Context::GetCurrent() crashes
// if there is no JavaScript currently running.
if (!v8::Context::InContext())
return NULL;
v8::Local<v8::Context> context = v8::Context::GetCurrent();
ContextList::iterator context_iter = FindContext(context);
if (context_iter == GetContexts().end())
return NULL;
else
return context_iter->get();
}
PendingRequest::PendingRequest(v8::Persistent<v8::Context> context,
const std::string& name)
: context(context), name(name) {
}
PendingRequest::~PendingRequest() {}
ContextList::iterator FindContext(v8::Handle<v8::Context> context) {
ContextList& all_contexts = GetContexts();
ContextList::iterator it = all_contexts.begin();
for (; it != all_contexts.end(); ++it) {
if ((*it)->context == context)
break;
}
return it;
}
PendingRequestMap& GetPendingRequestMap() {
return g_singleton_data.Get().pending_requests;
}
RenderView* GetRenderViewForCurrentContext() {
WebFrame* webframe = WebFrame::frameForCurrentContext();
DCHECK(webframe) << "RetrieveCurrentFrame called when not in a V8 context.";
if (!webframe)
return NULL;
WebView* webview = webframe->view();
if (!webview)
return NULL; // can happen during closing
RenderView* renderview = RenderView::FromWebView(webview);
DCHECK(renderview) << "Encountered a WebView without a WebViewDelegate";
return renderview;
}
v8::Handle<v8::Value> CallFunctionInContext(v8::Handle<v8::Context> context,
const std::string& function_name, int argc,
v8::Handle<v8::Value>* argv) {
v8::Context::Scope context_scope(context);
// Look up the function name, which may be a sub-property like
// "Port.dispatchOnMessage" in the hidden global variable.
v8::Local<v8::Value> value =
context->Global()->GetHiddenValue(v8::String::New(kChromeHidden));
std::vector<std::string> components;
base::SplitStringDontTrim(function_name, '.', &components);
for (size_t i = 0; i < components.size(); ++i) {
if (!value.IsEmpty() && value->IsObject())
value = value->ToObject()->Get(v8::String::New(components[i].c_str()));
}
if (value.IsEmpty() || !value->IsFunction()) {
NOTREACHED();
return v8::Undefined();
}
v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(value);
if (!function.IsEmpty())
return function->Call(v8::Object::New(), argc, argv);
return v8::Undefined();
}
} // namespace bindings_utils
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