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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.
#include "extensions/renderer/script_injection.h"
#include <map>
#include "base/lazy_instance.h"
#include "base/metrics/histogram.h"
#include "base/timer/elapsed_timer.h"
#include "base/values.h"
#include "content/public/renderer/render_view.h"
#include "content/public/renderer/v8_value_converter.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/feature_switch.h"
#include "extensions/common/manifest_handlers/csp_info.h"
#include "extensions/renderer/dom_activity_logger.h"
#include "extensions/renderer/extension_groups.h"
#include "extensions/renderer/extensions_renderer_client.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebScopedUserGesture.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebSecurityOrigin.h"
#include "url/gurl.h"
namespace extensions {
namespace {
typedef std::map<std::string, int> IsolatedWorldMap;
base::LazyInstance<IsolatedWorldMap> g_isolated_worlds =
LAZY_INSTANCE_INITIALIZER;
const int64 kInvalidRequestId = -1;
// The id of the next pending injection.
int64 g_next_pending_id = 0;
bool ShouldNotifyBrowserOfInjections() {
return !FeatureSwitch::scripts_require_action()->IsEnabled();
}
// Append all the child frames of |parent_frame| to |frames_vector|.
void AppendAllChildFrames(blink::WebFrame* parent_frame,
std::vector<blink::WebFrame*>* frames_vector) {
DCHECK(parent_frame);
for (blink::WebFrame* child_frame = parent_frame->firstChild(); child_frame;
child_frame = child_frame->nextSibling()) {
frames_vector->push_back(child_frame);
AppendAllChildFrames(child_frame, frames_vector);
}
}
// Gets the isolated world ID to use for the given |extension| in the given
// |frame|. If no isolated world has been created for that extension,
// one will be created and initialized.
int GetIsolatedWorldIdForExtension(const Extension* extension,
blink::WebFrame* frame) {
static int g_next_isolated_world_id =
ExtensionsRendererClient::Get()->GetLowestIsolatedWorldId();
IsolatedWorldMap& isolated_worlds = g_isolated_worlds.Get();
int id = 0;
IsolatedWorldMap::iterator iter = isolated_worlds.find(extension->id());
if (iter != isolated_worlds.end()) {
id = iter->second;
} else {
id = g_next_isolated_world_id++;
// This map will tend to pile up over time, but realistically, you're never
// going to have enough extensions for it to matter.
isolated_worlds[extension->id()] = id;
}
// We need to set the isolated world origin and CSP even if it's not a new
// world since these are stored per frame, and we might not have used this
// isolated world in this frame before.
frame->setIsolatedWorldSecurityOrigin(
id, blink::WebSecurityOrigin::create(extension->url()));
frame->setIsolatedWorldContentSecurityPolicy(
id,
blink::WebString::fromUTF8(CSPInfo::GetContentSecurityPolicy(extension)));
frame->setIsolatedWorldHumanReadableName(
id,
blink::WebString::fromUTF8(extension->name()));
return id;
}
} // namespace
// static
std::string ScriptInjection::GetExtensionIdForIsolatedWorld(
int isolated_world_id) {
IsolatedWorldMap& isolated_worlds = g_isolated_worlds.Get();
for (IsolatedWorldMap::iterator iter = isolated_worlds.begin();
iter != isolated_worlds.end();
++iter) {
if (iter->second == isolated_world_id)
return iter->first;
}
return std::string();
}
// static
void ScriptInjection::RemoveIsolatedWorld(const std::string& extension_id) {
g_isolated_worlds.Get().erase(extension_id);
}
ScriptInjection::ScriptInjection(
scoped_ptr<ScriptInjector> injector,
blink::WebFrame* web_frame,
const std::string& extension_id,
UserScript::RunLocation run_location,
int tab_id)
: injector_(injector.Pass()),
web_frame_(web_frame),
extension_id_(extension_id),
run_location_(run_location),
tab_id_(tab_id),
request_id_(kInvalidRequestId),
complete_(false) {
}
ScriptInjection::~ScriptInjection() {
if (!complete_)
injector_->OnWillNotInject(ScriptInjector::WONT_INJECT);
}
bool ScriptInjection::TryToInject(UserScript::RunLocation current_location,
const Extension* extension,
ScriptsRunInfo* scripts_run_info) {
if (current_location < run_location_)
return false; // Wait for the right location.
if (request_id_ != kInvalidRequestId)
return false; // We're waiting for permission right now, try again later.
if (!extension) {
NotifyWillNotInject(ScriptInjector::EXTENSION_REMOVED);
return true; // We're done.
}
switch (injector_->CanExecuteOnFrame(
extension, web_frame_, tab_id_, web_frame_->top()->document().url())) {
case PermissionsData::ACCESS_DENIED:
NotifyWillNotInject(ScriptInjector::NOT_ALLOWED);
return true; // We're done.
case PermissionsData::ACCESS_WITHHELD:
RequestPermission();
return false; // Wait around for permission.
case PermissionsData::ACCESS_ALLOWED:
Inject(extension, scripts_run_info);
return true; // We're done!
}
// Some compilers don't realize that we always return from the switch() above.
// Make them happy.
return false;
}
bool ScriptInjection::OnPermissionGranted(const Extension* extension,
ScriptsRunInfo* scripts_run_info) {
if (!extension) {
NotifyWillNotInject(ScriptInjector::EXTENSION_REMOVED);
return false;
}
Inject(extension, scripts_run_info);
return true;
}
void ScriptInjection::RequestPermission() {
content::RenderView* render_view =
content::RenderView::FromWebView(web_frame()->top()->view());
// If we are just notifying the browser of the injection, then send an
// invalid request (which is treated like a notification).
request_id_ = ShouldNotifyBrowserOfInjections() ? kInvalidRequestId
: g_next_pending_id++;
render_view->Send(new ExtensionHostMsg_RequestScriptInjectionPermission(
render_view->GetRoutingID(),
extension_id_,
injector_->script_type(),
request_id_));
}
void ScriptInjection::NotifyWillNotInject(
ScriptInjector::InjectFailureReason reason) {
complete_ = true;
injector_->OnWillNotInject(reason);
}
void ScriptInjection::Inject(const Extension* extension,
ScriptsRunInfo* scripts_run_info) {
DCHECK(extension);
DCHECK(scripts_run_info);
DCHECK(!complete_);
if (ShouldNotifyBrowserOfInjections())
RequestPermission();
std::vector<blink::WebFrame*> frame_vector;
frame_vector.push_back(web_frame_);
if (injector_->ShouldExecuteInChildFrames())
AppendAllChildFrames(web_frame_, &frame_vector);
scoped_ptr<blink::WebScopedUserGesture> gesture;
if (injector_->IsUserGesture())
gesture.reset(new blink::WebScopedUserGesture());
bool inject_js = injector_->ShouldInjectJs(run_location_);
bool inject_css = injector_->ShouldInjectCss(run_location_);
DCHECK(inject_js || inject_css);
scoped_ptr<base::ListValue> execution_results(new base::ListValue());
GURL top_url = web_frame_->top()->document().url();
for (std::vector<blink::WebFrame*>::iterator iter = frame_vector.begin();
iter != frame_vector.end();
++iter) {
blink::WebFrame* frame = *iter;
// We recheck access here in the renderer for extra safety against races
// with navigation, but different frames can have different URLs, and the
// extension might only have access to a subset of them.
// For child frames, we just skip ones the extension doesn't have access
// to and carry on.
// Note: we don't consider ACCESS_WITHHELD because there is nowhere to
// surface a request for a child frame.
// TODO(rdevlin.cronin): We should ask for permission somehow.
if (injector_->CanExecuteOnFrame(extension, frame, tab_id_, top_url) ==
PermissionsData::ACCESS_DENIED) {
DCHECK(frame->parent());
continue;
}
if (inject_js)
InjectJs(extension, frame, execution_results.get());
if (inject_css)
InjectCss(frame);
}
complete_ = true;
injector_->OnInjectionComplete(execution_results.Pass(),
scripts_run_info,
run_location_);
}
void ScriptInjection::InjectJs(const Extension* extension,
blink::WebFrame* frame,
base::ListValue* execution_results) {
std::vector<blink::WebScriptSource> sources =
injector_->GetJsSources(run_location_);
bool in_main_world = injector_->ShouldExecuteInMainWorld();
int world_id = in_main_world
? DOMActivityLogger::kMainWorldId
: GetIsolatedWorldIdForExtension(extension, frame);
bool expects_results = injector_->ExpectsResults();
base::ElapsedTimer exec_timer;
DOMActivityLogger::AttachToWorld(world_id, extension->id());
v8::HandleScope scope(v8::Isolate::GetCurrent());
v8::Local<v8::Value> script_value;
if (in_main_world) {
// We only inject in the main world for javascript: urls.
DCHECK_EQ(1u, sources.size());
const blink::WebScriptSource& source = sources.front();
if (expects_results)
script_value = frame->executeScriptAndReturnValue(source);
else
frame->executeScript(source);
} else { // in isolated world
scoped_ptr<blink::WebVector<v8::Local<v8::Value> > > results;
if (expects_results)
results.reset(new blink::WebVector<v8::Local<v8::Value> >());
frame->executeScriptInIsolatedWorld(world_id,
&sources.front(),
sources.size(),
EXTENSION_GROUP_CONTENT_SCRIPTS,
results.get());
if (expects_results && !results->isEmpty())
script_value = (*results)[0];
}
UMA_HISTOGRAM_TIMES("Extensions.InjectScriptTime", exec_timer.Elapsed());
if (expects_results) {
// Right now, we only support returning single results (per frame).
scoped_ptr<content::V8ValueConverter> v8_converter(
content::V8ValueConverter::create());
// It's safe to always use the main world context when converting
// here. V8ValueConverterImpl shouldn't actually care about the
// context scope, and it switches to v8::Object's creation context
// when encountered.
v8::Local<v8::Context> context = frame->mainWorldScriptContext();
scoped_ptr<base::Value> result(
v8_converter->FromV8Value(script_value, context));
// Always append an execution result (i.e. no result == null result)
// so that |execution_results| lines up with the frames.
execution_results->Append(result.get() ? result.release()
: base::Value::CreateNullValue());
}
}
void ScriptInjection::InjectCss(blink::WebFrame* frame) {
std::vector<std::string> css_sources =
injector_->GetCssSources(run_location_);
for (std::vector<std::string>::const_iterator iter = css_sources.begin();
iter != css_sources.end();
++iter) {
frame->document().insertStyleSheet(blink::WebString::fromUTF8(*iter));
}
}
} // namespace extensions
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