chrome/browser/renderer_host/pepper/pepper_flash_device_id_host.cc

   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_device_id_host.h"
   6
   7 #include "base/bind.h"
   8 #include "base/compiler_specific.h"
   9 #include "base/file_util.h"
  10 #include "base/logging.h"
  11 #include "content/public/browser/browser_context.h"
  12 #include "content/public/browser/browser_ppapi_host.h"
  13 #include "content/public/browser/browser_thread.h"
  14 #include "content/public/browser/render_process_host.h"
  15 #include "content/public/browser/render_view_host.h"
  16 #include "ppapi/c/pp_errors.h"
  17 #include "ppapi/host/dispatch_host_message.h"
  18 #include "ppapi/host/ppapi_host.h"
  19 #include "ppapi/proxy/ppapi_messages.h"
  20
  21 using content::BrowserPpapiHost;
  22 using content::BrowserThread;
  23
  24 namespace chrome {
  25
  26 namespace {
  27
  28 // The path to the file containing the DRM ID.
  29 // It is mirrored from
  30 //   chrome/browser/chromeos/system/drm_settings.cc
  31 const char kDRMIdentifierFile[] = "Pepper DRM ID.0";
  32
  33 }  // namespace
  34
  35 // PepperFlashDeviceIDHost::Fetcher --------------------------------------------
  36
  37 PepperFlashDeviceIDHost::Fetcher::Fetcher(
  38     const base::WeakPtr<PepperFlashDeviceIDHost>& host)
  39     : host_(host) {
  40   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  41 }
  42
  43 PepperFlashDeviceIDHost::Fetcher::~Fetcher() {
  44   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  45 }
  46
  47 void PepperFlashDeviceIDHost::Fetcher::Start(BrowserPpapiHost* browser_host) {
  48   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  49
  50   int process_id = 0;
  51   int view_id = 0;
  52   browser_host->GetRenderViewIDsForInstance(host_->pp_instance(),
  53                                             &process_id,
  54                                             &view_id);
  55   BrowserThread::PostTask(
  56       BrowserThread::UI, FROM_HERE,
  57       base::Bind(&PepperFlashDeviceIDHost::Fetcher::GetFilePathOnUIThread,
  58                  this, process_id, view_id));
  59 }
  60
  61 void PepperFlashDeviceIDHost::Fetcher::GetFilePathOnUIThread(
  62     int render_process_id,
  63     int render_view_id) {
  64   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  65
  66   base::FilePath path;
  67   content::RenderViewHost* render_view_host =
  68       content::RenderViewHost::FromID(render_process_id, render_view_id);
  69   if (render_view_host) {
  70     content::BrowserContext* browser_context =
  71         render_view_host->GetProcess()->GetBrowserContext();
  72     // Don't use DRM IDs when incognito to prevent tracking.
  73     if (!browser_context->IsOffTheRecord())
  74       path = browser_context->GetPath().AppendASCII(kDRMIdentifierFile);
  75   }
  76
  77   // Continue on the file thread (on failure/incognito, this will just send
  78   // the empty path which will forward the error).
  79   BrowserThread::PostTask(
  80       BrowserThread::FILE, FROM_HERE,
  81       base::Bind(&PepperFlashDeviceIDHost::Fetcher::ReadDRMFileOnFileThread,
  82                  this, path));
  83 }
  84
  85 void PepperFlashDeviceIDHost::Fetcher::ReadDRMFileOnFileThread(
  86     const base::FilePath& path) {
  87   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
  88
  89   std::string contents;
  90   if (!path.empty())
  91     file_util::ReadFileToString(path, &contents);
  92
  93   // Give back to the resource host on the IO thread. On failure this will just
  94   // forward the empty string.
  95   BrowserThread::PostTask(
  96       BrowserThread::IO, FROM_HERE,
  97       base::Bind(&PepperFlashDeviceIDHost::Fetcher::ReplyOnIOThread,
  98                  this, contents));
  99 }
 100
 101 void PepperFlashDeviceIDHost::Fetcher::ReplyOnIOThread(
 102     const std::string& contents) {
 103   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 104   if (host_.get())  // Plugin or resource could have been deleted.
 105     host_->GotDRMContents(contents);
 106 }
 107
 108 // PepperFlashDeviceIDHost -----------------------------------------------------
 109
 110 PepperFlashDeviceIDHost::PepperFlashDeviceIDHost(BrowserPpapiHost* host,
 111                                                  PP_Instance instance,
 112                                                  PP_Resource resource)
 113     : ppapi::host::ResourceHost(host->GetPpapiHost(), instance, resource),
 114       factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)),
 115       browser_ppapi_host_(host) {
 116 }
 117
 118 PepperFlashDeviceIDHost::~PepperFlashDeviceIDHost() {
 119 }
 120
 121 int32_t PepperFlashDeviceIDHost::OnResourceMessageReceived(
 122     const IPC::Message& msg,
 123     ppapi::host::HostMessageContext* context) {
 124   IPC_BEGIN_MESSAGE_MAP(PepperFlashDeviceIDHost, msg)
 125     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_FlashDeviceID_GetDeviceID,
 126                                         OnHostMsgGetDeviceID)
 127   IPC_END_MESSAGE_MAP()
 128   return PP_ERROR_FAILED;
 129 }
 130
 131 int32_t PepperFlashDeviceIDHost::OnHostMsgGetDeviceID(
 132     const ppapi::host::HostMessageContext* context) {
 133   if (fetcher_)
 134     return PP_ERROR_INPROGRESS;
 135
 136   fetcher_ = new Fetcher(factory_.GetWeakPtr());
 137   fetcher_->Start(browser_ppapi_host_);
 138   reply_context_ = context->MakeReplyMessageContext();
 139   return PP_OK_COMPLETIONPENDING;
 140 }
 141
 142 void PepperFlashDeviceIDHost::GotDRMContents(const std::string& contents) {
 143   fetcher_ = NULL;
 144   reply_context_.params.set_result(
 145       contents.empty() ? PP_ERROR_FAILED : PP_OK);
 146   host()->SendReply(reply_context_,
 147                     PpapiPluginMsg_FlashDeviceID_GetDeviceIDReply(contents));
 148 }
 149
 150 }  // namespace chrome