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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 "content/browser/plugin_data_remover_impl.h"
#include "base/bind.h"
#include "base/metrics/histogram.h"
#include "base/synchronization/waitable_event.h"
#include "base/version.h"
#include "content/browser/plugin_process_host.h"
#include "content/browser/plugin_service.h"
#include "content/common/plugin_messages.h"
#include "content/public/browser/browser_thread.h"
#include "webkit/plugins/npapi/plugin_group.h"
using content::BrowserThread;
namespace {
const char kFlashMimeType[] = "application/x-shockwave-flash";
// The minimum Flash Player version that implements NPP_ClearSiteData.
const char kMinFlashVersion[] = "10.3";
const int64 kRemovalTimeoutMs = 10000;
const uint64 kClearAllData = 0;
} // namespace
namespace content {
// static
PluginDataRemover* PluginDataRemover::Create(
const content::ResourceContext& resource_context) {
return new PluginDataRemoverImpl(resource_context);
}
// static
bool PluginDataRemover::IsSupported(webkit::WebPluginInfo* plugin) {
bool allow_wildcard = false;
std::vector<webkit::WebPluginInfo> plugins;
PluginService::GetInstance()->GetPluginInfoArray(
GURL(), kFlashMimeType, allow_wildcard, &plugins, NULL);
std::vector<webkit::WebPluginInfo>::iterator plugin_it = plugins.begin();
if (plugin_it == plugins.end())
return false;
scoped_ptr<Version> version(
webkit::npapi::PluginGroup::CreateVersionFromString(plugin_it->version));
scoped_ptr<Version> min_version(
Version::GetVersionFromString(kMinFlashVersion));
bool rv = version.get() && min_version->CompareTo(*version) == -1;
if (rv)
*plugin = *plugin_it;
return rv;
}
}
class PluginDataRemoverImpl::Context
: public PluginProcessHost::Client,
public IPC::Channel::Listener,
public base::RefCountedThreadSafe<Context> {
public:
Context(const std::string& mime_type,
base::Time begin_time,
const content::ResourceContext& resource_context)
: event_(new base::WaitableEvent(true, false)),
begin_time_(begin_time),
is_removing_(false),
resource_context_(resource_context),
channel_(NULL) {
// Balanced in OnChannelOpened or OnError. Exactly one them will eventually
// be called, so we need to keep this object around until then.
AddRef();
remove_start_time_ = base::Time::Now();
BrowserThread::PostTask(
BrowserThread::IO,
FROM_HERE,
base::Bind(&Context::Init, this, mime_type));
BrowserThread::PostDelayedTask(
BrowserThread::IO,
FROM_HERE,
base::Bind(&Context::OnTimeout, this),
kRemovalTimeoutMs);
}
virtual ~Context() {
if (channel_)
BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, channel_);
}
// PluginProcessHost::Client methods.
virtual int ID() OVERRIDE {
// Generate a unique identifier for this PluginProcessHostClient.
return ChildProcessInfo::GenerateChildProcessUniqueId();
}
virtual bool OffTheRecord() OVERRIDE {
return false;
}
virtual const content::ResourceContext& GetResourceContext() OVERRIDE {
return resource_context_;
}
virtual void SetPluginInfo(const webkit::WebPluginInfo& info) OVERRIDE {
}
virtual void OnFoundPluginProcessHost(PluginProcessHost* host) OVERRIDE {
}
virtual void OnSentPluginChannelRequest() OVERRIDE {
}
virtual void OnChannelOpened(const IPC::ChannelHandle& handle) OVERRIDE {
ConnectToChannel(handle);
// Balancing the AddRef call.
Release();
}
virtual void OnError() OVERRIDE {
LOG(DFATAL) << "Couldn't open plugin channel";
SignalDone();
// Balancing the AddRef call.
Release();
}
// IPC::Channel::Listener methods.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
IPC_BEGIN_MESSAGE_MAP(Context, message)
IPC_MESSAGE_HANDLER(PluginHostMsg_ClearSiteDataResult,
OnClearSiteDataResult)
IPC_MESSAGE_UNHANDLED_ERROR()
IPC_END_MESSAGE_MAP()
return true;
}
virtual void OnChannelError() OVERRIDE {
if (is_removing_) {
NOTREACHED() << "Channel error";
SignalDone();
}
}
base::WaitableEvent* event() { return event_.get(); }
private:
// Initialize on the IO thread.
void Init(const std::string& mime_type) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
is_removing_ = true;
PluginService::GetInstance()->OpenChannelToNpapiPlugin(
0, 0, GURL(), GURL(), mime_type, this);
}
// Connects the client side of a newly opened plug-in channel.
void ConnectToChannel(const IPC::ChannelHandle& handle) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// If we timed out, don't bother connecting.
if (!is_removing_)
return;
DCHECK(!channel_);
channel_ = new IPC::Channel(handle, IPC::Channel::MODE_CLIENT, this);
if (!channel_->Connect()) {
NOTREACHED() << "Couldn't connect to plugin";
SignalDone();
return;
}
if (!channel_->Send(new PluginMsg_ClearSiteData(std::string(),
kClearAllData,
begin_time_))) {
NOTREACHED() << "Couldn't send ClearSiteData message";
SignalDone();
return;
}
}
// Handles the PluginHostMsg_ClearSiteDataResult message.
void OnClearSiteDataResult(bool success) {
LOG_IF(ERROR, !success) << "ClearSiteData returned error";
UMA_HISTOGRAM_TIMES("ClearPluginData.time",
base::Time::Now() - remove_start_time_);
SignalDone();
}
// Called when a timeout happens in order not to block the client
// indefinitely.
void OnTimeout() {
LOG_IF(ERROR, is_removing_) << "Timed out";
SignalDone();
}
// Signals that we are finished with removing data (successful or not). This
// method is safe to call multiple times.
void SignalDone() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (!is_removing_)
return;
is_removing_ = false;
event_->Signal();
}
scoped_ptr<base::WaitableEvent> event_;
// The point in time when we start removing data.
base::Time remove_start_time_;
// The point in time from which on we remove data.
base::Time begin_time_;
bool is_removing_;
// The resource context for the profile.
const content::ResourceContext& resource_context_;
// We own the channel, but it's used on the IO thread, so it needs to be
// deleted there. It's NULL until we have opened a connection to the plug-in
// process.
IPC::Channel* channel_;
};
PluginDataRemoverImpl::PluginDataRemoverImpl(
const content::ResourceContext& resource_context)
: mime_type_(kFlashMimeType),
resource_context_(resource_context) {
}
PluginDataRemoverImpl::~PluginDataRemoverImpl() {
}
base::WaitableEvent* PluginDataRemoverImpl::StartRemoving(
base::Time begin_time) {
DCHECK(!context_.get());
context_ = new Context(mime_type_, begin_time, resource_context_);
return context_->event();
}
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