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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/user_script_slave.h"
#include <map>
#include "base/logging.h"
#include "base/memory/shared_memory.h"
#include "base/metrics/histogram.h"
#include "base/pickle.h"
#include "base/timer/elapsed_timer.h"
#include "content/public/renderer/render_thread.h"
#include "content/public/renderer/render_view.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/manifest_handlers/csp_info.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/renderer/extension_helper.h"
#include "extensions/renderer/extensions_renderer_client.h"
#include "extensions/renderer/script_context.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebSecurityOrigin.h"
#include "third_party/WebKit/public/web/WebSecurityPolicy.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "url/gurl.h"
using blink::WebFrame;
using blink::WebSecurityOrigin;
using blink::WebSecurityPolicy;
using blink::WebString;
using blink::WebView;
using content::RenderThread;
namespace extensions {
int UserScriptSlave::GetIsolatedWorldIdForExtension(const Extension* extension,
WebFrame* frame) {
static int g_next_isolated_world_id =
ExtensionsRendererClient::Get()->GetLowestIsolatedWorldId();
int id = 0;
IsolatedWorldMap::iterator iter = isolated_world_ids_.find(extension->id());
if (iter != isolated_world_ids_.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_world_ids_[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, WebSecurityOrigin::create(extension->url()));
frame->setIsolatedWorldContentSecurityPolicy(
id, WebString::fromUTF8(CSPInfo::GetContentSecurityPolicy(extension)));
return id;
}
std::string UserScriptSlave::GetExtensionIdForIsolatedWorld(
int isolated_world_id) {
for (IsolatedWorldMap::iterator iter = isolated_world_ids_.begin();
iter != isolated_world_ids_.end();
++iter) {
if (iter->second == isolated_world_id)
return iter->first;
}
return std::string();
}
void UserScriptSlave::RemoveIsolatedWorld(const std::string& extension_id) {
isolated_world_ids_.erase(extension_id);
}
UserScriptSlave::UserScriptSlave(const ExtensionSet* extensions)
: extensions_(extensions) {
}
UserScriptSlave::~UserScriptSlave() {
}
void UserScriptSlave::GetActiveExtensions(
std::set<std::string>* extension_ids) {
DCHECK(extension_ids);
for (ScopedVector<ScriptInjection>::const_iterator iter =
script_injections_.begin();
iter != script_injections_.end();
++iter) {
DCHECK(!(*iter)->extension_id().empty());
extension_ids->insert((*iter)->extension_id());
}
}
const Extension* UserScriptSlave::GetExtension(
const std::string& extension_id) {
return extensions_->GetByID(extension_id);
}
bool UserScriptSlave::UpdateScripts(base::SharedMemoryHandle shared_memory) {
script_injections_.clear();
bool only_inject_incognito =
ExtensionsRendererClient::Get()->IsIncognitoProcess();
// Create the shared memory object (read only).
shared_memory_.reset(new base::SharedMemory(shared_memory, true));
if (!shared_memory_.get())
return false;
// First get the size of the memory block.
if (!shared_memory_->Map(sizeof(Pickle::Header)))
return false;
Pickle::Header* pickle_header =
reinterpret_cast<Pickle::Header*>(shared_memory_->memory());
// Now map in the rest of the block.
int pickle_size = sizeof(Pickle::Header) + pickle_header->payload_size;
shared_memory_->Unmap();
if (!shared_memory_->Map(pickle_size))
return false;
// Unpickle scripts.
uint64 num_scripts = 0;
Pickle pickle(reinterpret_cast<char*>(shared_memory_->memory()), pickle_size);
PickleIterator iter(pickle);
CHECK(pickle.ReadUInt64(&iter, &num_scripts));
script_injections_.reserve(num_scripts);
for (uint64 i = 0; i < num_scripts; ++i) {
scoped_ptr<UserScript> script(new UserScript());
script->Unpickle(pickle, &iter);
// Note that this is a pointer into shared memory. We don't own it. It gets
// cleared up when the last renderer or browser process drops their
// reference to the shared memory.
for (size_t j = 0; j < script->js_scripts().size(); ++j) {
const char* body = NULL;
int body_length = 0;
CHECK(pickle.ReadData(&iter, &body, &body_length));
script->js_scripts()[j].set_external_content(
base::StringPiece(body, body_length));
}
for (size_t j = 0; j < script->css_scripts().size(); ++j) {
const char* body = NULL;
int body_length = 0;
CHECK(pickle.ReadData(&iter, &body, &body_length));
script->css_scripts()[j].set_external_content(
base::StringPiece(body, body_length));
}
if (only_inject_incognito && !script->is_incognito_enabled())
continue; // This script shouldn't run in an incognito tab.
script_injections_.push_back(new ScriptInjection(script.Pass(), this));
}
return true;
}
void UserScriptSlave::InjectScripts(WebFrame* frame,
UserScript::RunLocation location) {
GURL document_url = ScriptInjection::GetDocumentUrlForFrame(frame);
if (document_url.is_empty())
return;
content::RenderView* top_render_view =
content::RenderView::FromWebView(frame->top()->view());
ScriptInjection::ScriptsRunInfo scripts_run_info;
for (ScopedVector<ScriptInjection>::const_iterator iter =
script_injections_.begin();
iter != script_injections_.end();
++iter) {
ScriptInjection* injection = *iter;
if (!injection->WantsToRun(frame, location, document_url))
continue;
const Extension* extension = GetExtension(injection->extension_id());
DCHECK(extension);
if (PermissionsData::RequiresActionForScriptExecution(
extension,
ExtensionHelper::Get(top_render_view)->tab_id(),
document_url)) {
// TODO(rdevlin.cronin): Right now, this is just a notification, but soon
// we should block without user consent.
top_render_view->Send(
new ExtensionHostMsg_NotifyExtensionScriptExecution(
top_render_view->GetRoutingID(),
extension->id(),
top_render_view->GetPageId()));
}
injection->Inject(frame, location, &scripts_run_info);
}
LogScriptsRun(frame, location, scripts_run_info);
}
void UserScriptSlave::LogScriptsRun(
blink::WebFrame* frame,
UserScript::RunLocation location,
const ScriptInjection::ScriptsRunInfo& info) {
// Notify the browser if any extensions are now executing scripts.
if (!info.executing_scripts.empty()) {
content::RenderView* render_view =
content::RenderView::FromWebView(frame->view());
render_view->Send(new ExtensionHostMsg_ContentScriptsExecuting(
render_view->GetRoutingID(),
info.executing_scripts,
render_view->GetPageId(),
ScriptContext::GetDataSourceURLForFrame(frame)));
}
if (location == UserScript::DOCUMENT_START) {
UMA_HISTOGRAM_COUNTS_100("Extensions.InjectStart_CssCount",
info.num_css);
UMA_HISTOGRAM_COUNTS_100("Extensions.InjectStart_ScriptCount", info.num_js);
if (info.num_css || info.num_js)
UMA_HISTOGRAM_TIMES("Extensions.InjectStart_Time", info.timer.Elapsed());
} else if (location == UserScript::DOCUMENT_END) {
UMA_HISTOGRAM_COUNTS_100("Extensions.InjectEnd_ScriptCount", info.num_js);
if (info.num_js)
UMA_HISTOGRAM_TIMES("Extensions.InjectEnd_Time", info.timer.Elapsed());
} else if (location == UserScript::DOCUMENT_IDLE) {
UMA_HISTOGRAM_COUNTS_100("Extensions.InjectIdle_ScriptCount", info.num_js);
if (info.num_js)
UMA_HISTOGRAM_TIMES("Extensions.InjectIdle_Time", info.timer.Elapsed());
} else {
NOTREACHED();
}
}
} // namespace extensions
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