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// Copyright (c) 2012 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/browser/renderer_host/pepper/pepper_flash_drm_host.h"
#if defined(OS_WIN)
#include <Windows.h>
#endif
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "content/public/browser/browser_ppapi_host.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/common/pepper_plugin_info.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/host/dispatch_host_message.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#if defined(USE_AURA)
#include "ui/aura/window.h"
#include "ui/aura/window_tree_host.h"
#endif
#if defined(OS_MACOSX)
#include "chrome/browser/renderer_host/pepper/monitor_finder_mac.h"
#endif
using content::BrowserPpapiHost;
namespace chrome {
namespace {
const char kVoucherFilename[] = "plugin.vch";
}
#if defined(OS_WIN)
// Helper class to get the UI thread which monitor is showing the
// window associated with the instance's render view. Since we get
// called by the IO thread and we cannot block, the first answer is
// of GetMonitor() may be NULL, but eventually it will contain the
// right monitor.
class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
public:
MonitorFinder(int process_id, int render_frame_id)
: process_id_(process_id),
render_frame_id_(render_frame_id),
monitor_(NULL),
request_sent_(0) {}
int64_t GetMonitor() {
// We use |request_sent_| as an atomic boolean so that we
// never have more than one task posted at a given time. We
// do this because we don't know how often our client is going
// to call and we can't cache the |monitor_| value.
if (InterlockedCompareExchange(&request_sent_, 1, 0) == 0) {
content::BrowserThread::PostTask(
content::BrowserThread::UI,
FROM_HERE,
base::Bind(&MonitorFinder::FetchMonitorFromWidget, this));
}
return reinterpret_cast<int64_t>(monitor_);
}
private:
friend class base::RefCountedThreadSafe<MonitorFinder>;
~MonitorFinder() {}
void FetchMonitorFromWidget() {
InterlockedExchange(&request_sent_, 0);
content::RenderFrameHost* rfh =
content::RenderFrameHost::FromID(process_id_, render_frame_id_);
if (!rfh)
return;
gfx::NativeView native_view = rfh->GetNativeView();
#if defined(USE_AURA)
aura::WindowTreeHost* host = native_view->GetHost();
if (!host)
return;
HWND window = host->GetAcceleratedWidget();
#else
HWND window = native_view;
#endif
HMONITOR monitor = ::MonitorFromWindow(window, MONITOR_DEFAULTTONULL);
InterlockedExchangePointer(reinterpret_cast<void* volatile*>(&monitor_),
monitor);
}
const int process_id_;
const int render_frame_id_;
volatile HMONITOR monitor_;
volatile long request_sent_;
};
#elif !defined(OS_MACOSX)
// TODO(cpu): Support Linux someday.
class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
public:
MonitorFinder(int, int) {}
int64_t GetMonitor() { return 0; }
private:
friend class base::RefCountedThreadSafe<MonitorFinder>;
~MonitorFinder() {}
};
#endif
PepperFlashDRMHost::PepperFlashDRMHost(BrowserPpapiHost* host,
PP_Instance instance,
PP_Resource resource)
: ppapi::host::ResourceHost(host->GetPpapiHost(), instance, resource),
weak_factory_(this) {
// Grant permissions to read the flash voucher file.
int render_process_id;
int render_frame_id;
bool success = host->GetRenderFrameIDsForInstance(
instance, &render_process_id, &render_frame_id);
base::FilePath plugin_dir = host->GetPluginPath().DirName();
DCHECK(!plugin_dir.empty() && success);
base::FilePath voucher_file = plugin_dir.AppendASCII(kVoucherFilename);
content::ChildProcessSecurityPolicy::GetInstance()->GrantReadFile(
render_process_id, voucher_file);
fetcher_ = new DeviceIDFetcher(render_process_id);
monitor_finder_ = new MonitorFinder(render_process_id, render_frame_id);
monitor_finder_->GetMonitor();
}
PepperFlashDRMHost::~PepperFlashDRMHost() {}
int32_t PepperFlashDRMHost::OnResourceMessageReceived(
const IPC::Message& msg,
ppapi::host::HostMessageContext* context) {
PPAPI_BEGIN_MESSAGE_MAP(PepperFlashDRMHost, msg)
PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_GetDeviceID,
OnHostMsgGetDeviceID)
PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_GetHmonitor,
OnHostMsgGetHmonitor)
PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_MonitorIsExternal,
OnHostMsgMonitorIsExternal)
PPAPI_END_MESSAGE_MAP()
return PP_ERROR_FAILED;
}
int32_t PepperFlashDRMHost::OnHostMsgGetDeviceID(
ppapi::host::HostMessageContext* context) {
if (!fetcher_->Start(base::Bind(&PepperFlashDRMHost::GotDeviceID,
weak_factory_.GetWeakPtr(),
context->MakeReplyMessageContext()))) {
return PP_ERROR_INPROGRESS;
}
return PP_OK_COMPLETIONPENDING;
}
int32_t PepperFlashDRMHost::OnHostMsgGetHmonitor(
ppapi::host::HostMessageContext* context) {
int64_t monitor_id = monitor_finder_->GetMonitor();
if (monitor_id) {
context->reply_msg = PpapiPluginMsg_FlashDRM_GetHmonitorReply(monitor_id);
return PP_OK;
}
return PP_ERROR_FAILED;
}
int32_t PepperFlashDRMHost::OnHostMsgMonitorIsExternal(
ppapi::host::HostMessageContext* context) {
int64_t monitor_id = monitor_finder_->GetMonitor();
if (!monitor_id)
return PP_ERROR_FAILED;
PP_Bool is_external = PP_FALSE;
#if defined(OS_MACOSX)
if (!MonitorFinder::IsMonitorBuiltIn(monitor_id))
is_external = PP_TRUE;
#endif
context->reply_msg =
PpapiPluginMsg_FlashDRM_MonitorIsExternalReply(is_external);
return PP_OK;
}
void PepperFlashDRMHost::GotDeviceID(
ppapi::host::ReplyMessageContext reply_context,
const std::string& id,
int32_t result) {
if (id.empty() && result == PP_OK) {
NOTREACHED();
result = PP_ERROR_FAILED;
}
reply_context.params.set_result(result);
host()->SendReply(reply_context,
PpapiPluginMsg_FlashDRM_GetDeviceIDReply(id));
}
} // namespace chrome
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