pepper_flash_drm_host.cc revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/renderer_host/pepper/pepper_flash_drm_host.h"
6
7#if defined(OS_WIN)
8#include <Windows.h>
9#endif
10
11#include "base/bind.h"
12#include "base/compiler_specific.h"
13#include "base/logging.h"
14#include "base/memory/ref_counted.h"
15#include "content/public/browser/browser_ppapi_host.h"
16#include "content/public/browser/browser_thread.h"
17#include "content/public/browser/child_process_security_policy.h"
18#include "content/public/browser/render_frame_host.h"
19#include "content/public/common/pepper_plugin_info.h"
20#include "ppapi/c/pp_errors.h"
21#include "ppapi/host/dispatch_host_message.h"
22#include "ppapi/host/host_message_context.h"
23#include "ppapi/host/ppapi_host.h"
24#include "ppapi/proxy/ppapi_messages.h"
25
26#if defined(USE_AURA)
27#include "ui/aura/root_window.h"
28#include "ui/aura/window.h"
29#endif
30
31using content::BrowserPpapiHost;
32
33namespace chrome {
34
35namespace {
36const base::FilePath::CharType kVoucherFilename[] =
37    FILE_PATH_LITERAL("plugin.vch");
38}
39
40#if defined (OS_WIN)
41// Helper class to get the UI thread which monitor is showing the
42// window associated with the instance's render view. Since we get
43// called by the IO thread and we cannot block, the first answer is
44// of GetMonitor() may be NULL, but eventually it will contain the
45// right monitor.
46class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
47 public:
48  MonitorFinder(int process_id, int render_frame_id)
49      : process_id_(process_id),
50        render_frame_id_(render_frame_id),
51        monitor_(NULL),
52        request_sent_(0) {
53  }
54
55  int64_t GetMonitor() {
56    // We use |request_sent_| as an atomic boolean so that we
57    // never have more than one task posted at a given time. We
58    // do this because we don't know how often our client is going
59    // to call and we can't cache the |monitor_| value.
60    if (InterlockedCompareExchange(&request_sent_, 1, 0) == 0) {
61      content::BrowserThread::PostTask(
62          content::BrowserThread::UI, FROM_HERE,
63          base::Bind(&MonitorFinder::FetchMonitorFromWidget, this));
64    }
65    return reinterpret_cast<int64_t>(monitor_);
66  }
67
68 private:
69  friend class base::RefCountedThreadSafe<MonitorFinder>;
70  ~MonitorFinder() { }
71
72  void FetchMonitorFromWidget() {
73    InterlockedExchange(&request_sent_, 0);
74    content::RenderFrameHost* rfh =
75        content::RenderFrameHost::FromID(process_id_, render_frame_id_);
76    if (!rfh)
77      return;
78    gfx::NativeView native_view = rfh->GetNativeView();
79#if defined(USE_AURA)
80    aura::WindowEventDispatcher* dispatcher = native_view->GetDispatcher();
81    if (!dispatcher)
82      return;
83    HWND window = dispatcher->host()->GetAcceleratedWidget();
84#else
85    HWND window = native_view;
86#endif
87    HMONITOR monitor = ::MonitorFromWindow(window, MONITOR_DEFAULTTONULL);
88    InterlockedExchangePointer(reinterpret_cast<void* volatile *>(&monitor_),
89                               monitor);
90  }
91
92  const int process_id_;
93  const int render_frame_id_;
94  volatile HMONITOR monitor_;
95  volatile long request_sent_;
96};
97#else
98// TODO(cpu): Support Mac and Linux someday.
99class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
100 public:
101  MonitorFinder(int, int) { }
102  int64_t GetMonitor() { return 0; }
103
104 private:
105  friend class base::RefCountedThreadSafe<MonitorFinder>;
106  ~MonitorFinder() { }
107};
108#endif
109
110PepperFlashDRMHost::PepperFlashDRMHost(BrowserPpapiHost* host,
111                                       PP_Instance instance,
112                                       PP_Resource resource)
113    : ppapi::host::ResourceHost(host->GetPpapiHost(), instance, resource),
114      weak_factory_(this){
115  // Grant permissions to read the flash voucher file.
116  int render_process_id;
117  int render_frame_id;
118  bool success =
119      host->GetRenderFrameIDsForInstance(
120          instance, &render_process_id, &render_frame_id);
121  base::FilePath plugin_dir = host->GetPluginPath().DirName();
122  DCHECK(!plugin_dir.empty() && success);
123  base::FilePath voucher_file = plugin_dir.Append(
124      base::FilePath(kVoucherFilename));
125  content::ChildProcessSecurityPolicy::GetInstance()->GrantReadFile(
126      render_process_id, voucher_file);
127
128  fetcher_ = new DeviceIDFetcher(render_process_id);
129  monitor_finder_ = new MonitorFinder(render_process_id, render_frame_id);
130  monitor_finder_->GetMonitor();
131}
132
133PepperFlashDRMHost::~PepperFlashDRMHost() {
134}
135
136int32_t PepperFlashDRMHost::OnResourceMessageReceived(
137    const IPC::Message& msg,
138    ppapi::host::HostMessageContext* context) {
139  IPC_BEGIN_MESSAGE_MAP(PepperFlashDRMHost, msg)
140    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_GetDeviceID,
141                                        OnHostMsgGetDeviceID)
142    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_GetHmonitor,
143                                        OnHostMsgGetHmonitor)
144    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_MonitorIsExternal,
145                                        OnHostMsgMonitorIsExternal)
146  IPC_END_MESSAGE_MAP()
147  return PP_ERROR_FAILED;
148}
149
150int32_t PepperFlashDRMHost::OnHostMsgGetDeviceID(
151    ppapi::host::HostMessageContext* context) {
152  if (!fetcher_->Start(base::Bind(&PepperFlashDRMHost::GotDeviceID,
153                                  weak_factory_.GetWeakPtr(),
154                                  context->MakeReplyMessageContext()))) {
155    return PP_ERROR_INPROGRESS;
156  }
157  return PP_OK_COMPLETIONPENDING;
158}
159
160int32_t PepperFlashDRMHost::OnHostMsgGetHmonitor(
161    ppapi::host::HostMessageContext* context) {
162  int64_t monitor_id = monitor_finder_->GetMonitor();
163  if (monitor_id) {
164    context->reply_msg = PpapiPluginMsg_FlashDRM_GetHmonitorReply(monitor_id);
165    return PP_OK;
166  } else {
167    return PP_ERROR_FAILED;
168  }
169}
170
171int32_t PepperFlashDRMHost::OnHostMsgMonitorIsExternal(
172    ppapi::host::HostMessageContext* context) {
173  int64_t monitor_id = monitor_finder_->GetMonitor();
174  if (monitor_id) {
175    // TODO(bbudge) get information about whether monitor is external.
176    context->reply_msg =
177        PpapiPluginMsg_FlashDRM_MonitorIsExternalReply(PP_FALSE);
178    return PP_OK;
179  } else {
180    return PP_ERROR_FAILED;
181  }
182}
183
184void PepperFlashDRMHost::GotDeviceID(
185    ppapi::host::ReplyMessageContext reply_context,
186    const std::string& id,
187    int32_t result) {
188  if (id.empty() && result == PP_OK) {
189    NOTREACHED();
190    result = PP_ERROR_FAILED;
191  }
192  reply_context.params.set_result(result);
193  host()->SendReply(reply_context,
194                    PpapiPluginMsg_FlashDRM_GetDeviceIDReply(id));
195}
196
197}  // namespace chrome
198