pepper_flash_drm_host.cc revision f2477e01787aa58f445919b809d89e252beef54f 
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_widget_host.h"
19#include "content/public/browser/render_widget_host_view.h"
20#include "content/public/common/pepper_plugin_info.h"
21#include "ppapi/c/pp_errors.h"
22#include "ppapi/host/dispatch_host_message.h"
23#include "ppapi/host/host_message_context.h"
24#include "ppapi/host/ppapi_host.h"
25#include "ppapi/proxy/ppapi_messages.h"
26
27#if defined(USE_AURA)
28#include "ui/aura/root_window.h"
29#include "ui/aura/window.h"
30#endif
31
32using content::BrowserPpapiHost;
33
34namespace chrome {
35
36namespace {
37const base::FilePath::CharType kVoucherFilename[] =
38    FILE_PATH_LITERAL("plugin.vch");
39}
40
41#if defined (OS_WIN)
42// Helper class to get the UI thread which monitor is showing the
43// window associated with the instance's render view. Since we get
44// called by the IO thread and we cannot block, the first answer is
45// of GetMonitor() may be NULL, but eventually it will contain the
46// right monitor.
47class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
48 public:
49  MonitorFinder(int process_id, int render_id)
50      : process_id_(process_id),
51        render_id_(render_id),
52        monitor_(NULL),
53        request_sent_(0) {
54  }
55
56  int64_t GetMonitor() {
57    // We use |request_sent_| as an atomic boolean so that we
58    // never have more than one task posted at a given time. We
59    // do this because we don't know how often our client is going
60    // to call and we can't cache the |monitor_| value.
61    if (InterlockedCompareExchange(&request_sent_, 1, 0) == 0) {
62      content::BrowserThread::PostTask(
63          content::BrowserThread::UI, FROM_HERE,
64          base::Bind(&MonitorFinder::FetchMonitorFromWidget, this));
65    }
66    return reinterpret_cast<int64_t>(monitor_);
67  }
68
69 private:
70  friend class base::RefCountedThreadSafe<MonitorFinder>;
71  ~MonitorFinder() { }
72
73  void FetchMonitorFromWidget() {
74    InterlockedExchange(&request_sent_, 0);
75    content::RenderWidgetHost* rwh =
76        content::RenderWidgetHost::FromID(process_id_, render_id_);
77    if (!rwh)
78      return;
79    content::RenderWidgetHostView* view = rwh->GetView();
80    if (!view)
81      return;
82    gfx::NativeView native_view = view->GetNativeView();
83#if defined(USE_AURA)
84    aura::WindowEventDispatcher* dispatcher = native_view->GetDispatcher();
85    if (!dispatcher)
86      return;
87    HWND window = dispatcher->host()->GetAcceleratedWidget();
88#else
89    HWND window = native_view;
90#endif
91    HMONITOR monitor = ::MonitorFromWindow(window, MONITOR_DEFAULTTONULL);
92    InterlockedExchangePointer(reinterpret_cast<void* volatile *>(&monitor_),
93                               monitor);
94  }
95
96  const int process_id_;
97  const int render_id_;
98  volatile HMONITOR monitor_;
99  volatile long request_sent_;
100};
101#else
102// TODO(cpu): Support Mac and Linux someday.
103class MonitorFinder : public base::RefCountedThreadSafe<MonitorFinder> {
104 public:
105  MonitorFinder(int, int) { }
106  int64_t GetMonitor() { return 0; }
107
108 private:
109  friend class base::RefCountedThreadSafe<MonitorFinder>;
110  ~MonitorFinder() { }
111};
112#endif
113
114PepperFlashDRMHost::PepperFlashDRMHost(BrowserPpapiHost* host,
115                                       PP_Instance instance,
116                                       PP_Resource resource)
117    : ppapi::host::ResourceHost(host->GetPpapiHost(), instance, resource),
118      weak_factory_(this){
119  // Grant permissions to read the flash voucher file.
120  int render_process_id;
121  int render_view_id;
122  bool success =
123      host->GetRenderViewIDsForInstance(
124          instance, &render_process_id, &render_view_id);
125  base::FilePath plugin_dir = host->GetPluginPath().DirName();
126  DCHECK(!plugin_dir.empty() && success);
127  base::FilePath voucher_file = plugin_dir.Append(
128      base::FilePath(kVoucherFilename));
129  content::ChildProcessSecurityPolicy::GetInstance()->GrantReadFile(
130      render_process_id, voucher_file);
131
132  fetcher_ = new DeviceIDFetcher(render_process_id);
133  monitor_finder_ = new MonitorFinder(render_process_id, render_view_id);
134  monitor_finder_->GetMonitor();
135}
136
137PepperFlashDRMHost::~PepperFlashDRMHost() {
138}
139
140int32_t PepperFlashDRMHost::OnResourceMessageReceived(
141    const IPC::Message& msg,
142    ppapi::host::HostMessageContext* context) {
143  IPC_BEGIN_MESSAGE_MAP(PepperFlashDRMHost, msg)
144    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_GetDeviceID,
145                                        OnHostMsgGetDeviceID)
146    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_GetHmonitor,
147                                        OnHostMsgGetHmonitor)
148    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDRM_MonitorIsExternal,
149                                        OnHostMsgMonitorIsExternal)
150  IPC_END_MESSAGE_MAP()
151  return PP_ERROR_FAILED;
152}
153
154int32_t PepperFlashDRMHost::OnHostMsgGetDeviceID(
155    ppapi::host::HostMessageContext* context) {
156  if (!fetcher_->Start(base::Bind(&PepperFlashDRMHost::GotDeviceID,
157                                  weak_factory_.GetWeakPtr(),
158                                  context->MakeReplyMessageContext()))) {
159    return PP_ERROR_INPROGRESS;
160  }
161  return PP_OK_COMPLETIONPENDING;
162}
163
164int32_t PepperFlashDRMHost::OnHostMsgGetHmonitor(
165    ppapi::host::HostMessageContext* context) {
166  int64_t monitor_id = monitor_finder_->GetMonitor();
167  if (monitor_id) {
168    context->reply_msg = PpapiPluginMsg_FlashDRM_GetHmonitorReply(monitor_id);
169    return PP_OK;
170  } else {
171    return PP_ERROR_FAILED;
172  }
173}
174
175int32_t PepperFlashDRMHost::OnHostMsgMonitorIsExternal(
176    ppapi::host::HostMessageContext* context) {
177  int64_t monitor_id = monitor_finder_->GetMonitor();
178  if (monitor_id) {
179    // TODO(bbudge) get information about whether monitor is external.
180    context->reply_msg =
181        PpapiPluginMsg_FlashDRM_MonitorIsExternalReply(PP_FALSE);
182    return PP_OK;
183  } else {
184    return PP_ERROR_FAILED;
185  }
186}
187
188void PepperFlashDRMHost::GotDeviceID(
189    ppapi::host::ReplyMessageContext reply_context,
190    const std::string& id,
191    int32_t result) {
192  if (id.empty() && result == PP_OK) {
193    NOTREACHED();
194    result = PP_ERROR_FAILED;
195  }
196  reply_context.params.set_result(result);
197  host()->SendReply(reply_context,
198                    PpapiPluginMsg_FlashDRM_GetDeviceIDReply(id));
199}
200
201}  // namespace chrome
202