content/browser/renderer_host/pepper/pepper_renderer_connection.cc

   1 // Copyright 2013 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 "content/browser/renderer_host/pepper/pepper_renderer_connection.h"
   6
   7 #include "base/bind.h"
   8 #include "base/memory/ref_counted.h"
   9 #include "content/browser/browser_child_process_host_impl.h"
  10 #include "content/browser/ppapi_plugin_process_host.h"
  11 #include "content/browser/renderer_host/pepper/browser_ppapi_host_impl.h"
  12 #include "content/common/frame_messages.h"
  13 #include "content/common/pepper_renderer_instance_data.h"
  14 #include "content/browser/renderer_host/pepper/pepper_file_ref_host.h"
  15 #include "content/browser/renderer_host/pepper/pepper_file_system_browser_host.h"
  16 #include "content/public/browser/content_browser_client.h"
  17 #include "content/public/common/content_client.h"
  18 #include "ipc/ipc_message_macros.h"
  19 #include "ppapi/host/resource_host.h"
  20 #include "ppapi/proxy/ppapi_message_utils.h"
  21 #include "ppapi/proxy/ppapi_messages.h"
  22 #include "ppapi/proxy/resource_message_params.h"
  23
  24 namespace content {
  25
  26 namespace {
  27
  28 const uint32 kFilteredMessageClasses[] = {
  29   PpapiMsgStart,
  30   FrameMsgStart,
  31 };
  32
  33 // Responsible for creating the pending resource hosts, holding their IDs until
  34 // all of them have been created for a single message, and sending the reply to
  35 // say that the hosts have been created.
  36 class PendingHostCreator : public base::RefCounted<PendingHostCreator> {
  37  public:
  38   PendingHostCreator(BrowserPpapiHostImpl* host,
  39                      BrowserMessageFilter* connection,
  40                      int routing_id,
  41                      int sequence_id,
  42                      size_t nested_msgs_size);
  43
  44   // Adds the given resource host as a pending one. The host is remembered as
  45   // host number |index|, and will ultimately be sent to the plugin to be
  46   // attached to a real resource.
  47   void AddPendingResourceHost(
  48       size_t index,
  49       scoped_ptr<ppapi::host::ResourceHost> resource_host);
  50
  51  private:
  52   friend class base::RefCounted<PendingHostCreator>;
  53
  54   // When the last reference to this class is released, all of the resource
  55   // hosts would have been added. This destructor sends the message to the
  56   // plugin to tell it to attach real hosts to all of the pending hosts that
  57   // have been added by this object.
  58   ~PendingHostCreator();
  59
  60   BrowserPpapiHostImpl* host_;
  61   BrowserMessageFilter* connection_;
  62   int routing_id_;
  63   int sequence_id_;
  64   std::vector<int> pending_resource_host_ids_;
  65 };
  66
  67 PendingHostCreator::PendingHostCreator(BrowserPpapiHostImpl* host,
  68                                        BrowserMessageFilter* connection,
  69                                        int routing_id,
  70                                        int sequence_id,
  71                                        size_t nested_msgs_size)
  72     : host_(host),
  73       connection_(connection),
  74       routing_id_(routing_id),
  75       sequence_id_(sequence_id),
  76       pending_resource_host_ids_(nested_msgs_size, 0) {}
  77
  78 void PendingHostCreator::AddPendingResourceHost(
  79     size_t index,
  80     scoped_ptr<ppapi::host::ResourceHost> resource_host) {
  81   pending_resource_host_ids_[index] =
  82       host_->GetPpapiHost()->AddPendingResourceHost(resource_host.Pass());
  83 }
  84
  85 PendingHostCreator::~PendingHostCreator() {
  86   connection_->Send(new PpapiHostMsg_CreateResourceHostsFromHostReply(
  87       routing_id_, sequence_id_, pending_resource_host_ids_));
  88 }
  89
  90 }  // namespace
  91
  92 PepperRendererConnection::PepperRendererConnection(int render_process_id)
  93     : BrowserMessageFilter(kFilteredMessageClasses,
  94                            arraysize(kFilteredMessageClasses)),
  95       render_process_id_(render_process_id) {
  96   // Only give the renderer permission for stable APIs.
  97   in_process_host_.reset(new BrowserPpapiHostImpl(this,
  98                                                   ppapi::PpapiPermissions(),
  99                                                   "",
 100                                                   base::FilePath(),
 101                                                   base::FilePath(),
 102                                                   true /* in_process */,
 103                                                   false /* external_plugin */));
 104 }
 105
 106 PepperRendererConnection::~PepperRendererConnection() {}
 107
 108 BrowserPpapiHostImpl* PepperRendererConnection::GetHostForChildProcess(
 109     int child_process_id) const {
 110   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 111
 112   // Find the plugin which this message refers to. Check NaCl plugins first.
 113   BrowserPpapiHostImpl* host = static_cast<BrowserPpapiHostImpl*>(
 114       GetContentClient()->browser()->GetExternalBrowserPpapiHost(
 115           child_process_id));
 116
 117   if (!host) {
 118     // Check trusted pepper plugins.
 119     for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 120       if (iter->process() &&
 121           iter->process()->GetData().id == child_process_id) {
 122         // Found the plugin.
 123         host = iter->host_impl();
 124         break;
 125       }
 126     }
 127   }
 128
 129   // If the message is being sent from an in-process plugin, we own the
 130   // BrowserPpapiHost.
 131   if (!host && child_process_id == 0) {
 132     host = in_process_host_.get();
 133   }
 134
 135   return host;
 136 }
 137
 138 bool PepperRendererConnection::OnMessageReceived(const IPC::Message& msg) {
 139   if (in_process_host_->GetPpapiHost()->OnMessageReceived(msg))
 140     return true;
 141
 142   bool handled = true;
 143   IPC_BEGIN_MESSAGE_MAP(PepperRendererConnection, msg)
 144     IPC_MESSAGE_HANDLER(PpapiHostMsg_CreateResourceHostsFromHost,
 145                         OnMsgCreateResourceHostsFromHost)
 146     IPC_MESSAGE_HANDLER(FrameHostMsg_DidCreateInProcessInstance,
 147                         OnMsgDidCreateInProcessInstance)
 148     IPC_MESSAGE_HANDLER(FrameHostMsg_DidDeleteInProcessInstance,
 149                         OnMsgDidDeleteInProcessInstance)
 150     IPC_MESSAGE_UNHANDLED(handled = false)
 151   IPC_END_MESSAGE_MAP()
 152
 153   return handled;
 154 }
 155
 156 void PepperRendererConnection::OnMsgCreateResourceHostsFromHost(
 157     int routing_id,
 158     int child_process_id,
 159     const ppapi::proxy::ResourceMessageCallParams& params,
 160     PP_Instance instance,
 161     const std::vector<IPC::Message>& nested_msgs) {
 162   BrowserPpapiHostImpl* host = GetHostForChildProcess(child_process_id);
 163   if (!host) {
 164     DLOG(ERROR) << "Invalid plugin process ID.";
 165     return;
 166   }
 167
 168   scoped_refptr<PendingHostCreator> creator = new PendingHostCreator(
 169       host, this, routing_id, params.sequence(), nested_msgs.size());
 170   for (size_t i = 0; i < nested_msgs.size(); ++i) {
 171     const IPC::Message& nested_msg = nested_msgs[i];
 172     scoped_ptr<ppapi::host::ResourceHost> resource_host;
 173     if (host->IsValidInstance(instance)) {
 174       if (nested_msg.type() == PpapiHostMsg_FileRef_CreateForRawFS::ID) {
 175         // FileRef_CreateForRawFS is only permitted from the renderer. Because
 176         // of this, we handle this message here and not in
 177         // content_browser_pepper_host_factory.cc.
 178         base::FilePath external_path;
 179         if (ppapi::UnpackMessage<PpapiHostMsg_FileRef_CreateForRawFS>(
 180                 nested_msg, &external_path)) {
 181           resource_host.reset(new PepperFileRefHost(
 182               host, instance, params.pp_resource(), external_path));
 183         }
 184       } else if (nested_msg.type() ==
 185                  PpapiHostMsg_FileSystem_CreateFromRenderer::ID) {
 186         // Similarly, FileSystem_CreateFromRenderer is only permitted from the
 187         // renderer.
 188         std::string root_url;
 189         PP_FileSystemType file_system_type;
 190         if (ppapi::UnpackMessage<PpapiHostMsg_FileSystem_CreateFromRenderer>(
 191                 nested_msg, &root_url, &file_system_type)) {
 192           PepperFileSystemBrowserHost* browser_host =
 193               new PepperFileSystemBrowserHost(
 194                   host, instance, params.pp_resource(), file_system_type);
 195           resource_host.reset(browser_host);
 196           // Open the file system resource host. This is an asynchronous
 197           // operation, and we must only add the pending resource host and
 198           // send the message once it completes.
 199           browser_host->OpenExisting(
 200               GURL(root_url),
 201               base::Bind(&PendingHostCreator::AddPendingResourceHost,
 202                          creator,
 203                          i,
 204                          base::Passed(&resource_host)));
 205           // Do not fall through; the fall-through case adds the pending
 206           // resource host to the list. We must do this asynchronously.
 207           continue;
 208         }
 209       }
 210     }
 211
 212     if (!resource_host.get()) {
 213       resource_host = host->GetPpapiHost()->CreateResourceHost(
 214           params.pp_resource(), instance, nested_msg);
 215     }
 216
 217     if (resource_host.get())
 218       creator->AddPendingResourceHost(i, resource_host.Pass());
 219   }
 220
 221   // Note: All of the pending host IDs that were added as part of this
 222   // operation will automatically be sent to the plugin when |creator| is
 223   // released. This may happen immediately, or (if there are asynchronous
 224   // requests to create resource hosts), once all of them complete.
 225 }
 226
 227 void PepperRendererConnection::OnMsgDidCreateInProcessInstance(
 228     PP_Instance instance,
 229     const PepperRendererInstanceData& instance_data) {
 230   PepperRendererInstanceData data = instance_data;
 231   data.render_process_id = render_process_id_;
 232   in_process_host_->AddInstance(instance, data);
 233 }
 234
 235 void PepperRendererConnection::OnMsgDidDeleteInProcessInstance(
 236     PP_Instance instance) {
 237   in_process_host_->DeleteInstance(instance);
 238 }
 239
 240 }  // namespace content