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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/user_script_idle_scheduler.h"
#include "base/message_loop.h"
#include "chrome/common/extensions/extension_error_utils.h"
#include "chrome/common/extensions/extension_messages.h"
#include "chrome/renderer/extension_groups.h"
#include "chrome/renderer/extensions/extension_dispatcher.h"
#include "chrome/renderer/render_thread.h"
#include "chrome/renderer/extensions/user_script_slave.h"
#include "content/renderer/render_view.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
namespace {
// The length of time to wait after the DOM is complete to try and run user
// scripts.
const int kUserScriptIdleTimeoutMs = 200;
}
using WebKit::WebFrame;
using WebKit::WebString;
using WebKit::WebView;
UserScriptIdleScheduler::UserScriptIdleScheduler(RenderView* render_view,
WebFrame* frame)
: RenderViewObserver(render_view),
ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)),
frame_(frame),
has_run_(false) {
}
UserScriptIdleScheduler::~UserScriptIdleScheduler() {
}
bool UserScriptIdleScheduler::OnMessageReceived(const IPC::Message& message) {
if (message.type() != ExtensionMsg_ExecuteCode::ID)
return false;
// chrome.tabs.executeScript() only supports execution in either the top frame
// or all frames. We handle both cases in the top frame.
WebFrame* main_frame = GetMainFrame();
if (main_frame && main_frame != frame_)
return false;
IPC_BEGIN_MESSAGE_MAP(UserScriptIdleScheduler, message)
IPC_MESSAGE_HANDLER(ExtensionMsg_ExecuteCode, OnExecuteCode)
IPC_END_MESSAGE_MAP()
return true;
}
void UserScriptIdleScheduler::DidFinishDocumentLoad(WebFrame* frame) {
if (frame != frame_)
return;
MessageLoop::current()->PostDelayedTask(FROM_HERE,
method_factory_.NewRunnableMethod(&UserScriptIdleScheduler::MaybeRun),
kUserScriptIdleTimeoutMs);
}
void UserScriptIdleScheduler::DidFinishLoad(WebFrame* frame) {
if (frame != frame_)
return;
// Ensure that running scripts does not keep any progress UI running.
MessageLoop::current()->PostTask(FROM_HERE,
method_factory_.NewRunnableMethod(&UserScriptIdleScheduler::MaybeRun));
}
void UserScriptIdleScheduler::DidStartProvisionalLoad(WebKit::WebFrame* frame) {
// The frame is navigating, so reset the state since we'll want to inject
// scripts once the load finishes.
has_run_ = false;
method_factory_.RevokeAll();
while (!pending_code_execution_queue_.empty())
pending_code_execution_queue_.pop();
}
void UserScriptIdleScheduler::FrameDetached(WebFrame* frame) {
if (frame != frame_)
return;
delete this;
}
void UserScriptIdleScheduler::MaybeRun() {
if (has_run_)
return;
// Note: we must set this before calling ExecuteCodeImpl, because that may
// result in a synchronous call back into MaybeRun if there is a pending task
// currently in the queue.
// http://code.google.com/p/chromium/issues/detail?id=29644
has_run_ = true;
if (RenderThread::current()) { // Will be NULL during unit tests.
ExtensionDispatcher::Get()->user_script_slave()->InjectScripts(
frame_, UserScript::DOCUMENT_IDLE);
}
while (!pending_code_execution_queue_.empty()) {
linked_ptr<ExtensionMsg_ExecuteCode_Params>& params =
pending_code_execution_queue_.front();
ExecuteCodeImpl(GetMainFrame(), *params);
pending_code_execution_queue_.pop();
}
}
void UserScriptIdleScheduler::OnExecuteCode(
const ExtensionMsg_ExecuteCode_Params& params) {
WebFrame* main_frame = GetMainFrame();
if (!main_frame) {
Send(new ExtensionHostMsg_ExecuteCodeFinished(
routing_id(), params.request_id, false, ""));
return;
}
if (!has_run_) {
pending_code_execution_queue_.push(
linked_ptr<ExtensionMsg_ExecuteCode_Params>(
new ExtensionMsg_ExecuteCode_Params(params)));
return;
}
ExecuteCodeImpl(main_frame, params);
}
void UserScriptIdleScheduler::ExecuteCodeImpl(
WebFrame* frame, const ExtensionMsg_ExecuteCode_Params& params) {
const Extension* extension =
ExtensionDispatcher::Get()->extensions()->GetByID(
params.extension_id);
// Since extension info is sent separately from user script info, they can
// be out of sync. We just ignore this situation.
if (!extension) {
Send(new ExtensionHostMsg_ExecuteCodeFinished(
routing_id(), params.request_id, true, ""));
return;
}
std::vector<WebFrame*> frame_vector;
frame_vector.push_back(frame);
if (params.all_frames)
GetAllChildFrames(frame, &frame_vector);
for (std::vector<WebFrame*>::iterator frame_it = frame_vector.begin();
frame_it != frame_vector.end(); ++frame_it) {
WebFrame* frame = *frame_it;
if (params.is_javascript) {
// 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 the top frame, we can
// immediately send an error and stop because the browser process
// considers that an error too.
//
// For child frames, we just skip ones the extension doesn't have access
// to and carry on.
if (!extension->CanExecuteScriptOnPage(frame->url(), NULL, NULL)) {
if (frame->parent()) {
continue;
} else {
Send(new ExtensionHostMsg_ExecuteCodeFinished(
routing_id(), params.request_id, false,
ExtensionErrorUtils::FormatErrorMessage(
extension_manifest_errors::kCannotAccessPage,
frame->url().spec())));
return;
}
}
WebScriptSource source(WebString::fromUTF8(params.code));
if (params.in_main_world) {
frame->executeScript(source);
} else {
std::vector<WebScriptSource> sources;
sources.push_back(source);
UserScriptSlave::InsertInitExtensionCode(&sources, params.extension_id);
frame->executeScriptInIsolatedWorld(
UserScriptSlave::GetIsolatedWorldId(params.extension_id),
&sources.front(), sources.size(), EXTENSION_GROUP_CONTENT_SCRIPTS);
}
} else {
frame->insertStyleText(WebString::fromUTF8(params.code), WebString());
}
}
Send(new ExtensionHostMsg_ExecuteCodeFinished(
routing_id(), params.request_id, true, ""));
}
bool UserScriptIdleScheduler::GetAllChildFrames(
WebFrame* parent_frame,
std::vector<WebFrame*>* frames_vector) const {
if (!parent_frame)
return false;
for (WebFrame* child_frame = parent_frame->firstChild(); child_frame;
child_frame = child_frame->nextSibling()) {
frames_vector->push_back(child_frame);
GetAllChildFrames(child_frame, frames_vector);
}
return true;
}
WebFrame* UserScriptIdleScheduler::GetMainFrame() {
WebView* webview = render_view()->webview();
return webview ? webview->mainFrame() : NULL;
}
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