src/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/pepper_renderer_instance_data.h"
  13 #include "content/common/view_messages.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/ppapi_message_utils.h"
  23 #include "ppapi/proxy/resource_message_params.h"
  24
  25 namespace content {
  26
  27 namespace {
  28
  29 // Responsible for creating the pending resource hosts, holding their IDs until
  30 // all of them have been created for a single message, and sending the reply to
  31 // say that the hosts have been created.
  32 class PendingHostCreator
  33     : public base::RefCounted<PendingHostCreator> {
  34  public:
  35   PendingHostCreator(BrowserPpapiHostImpl* host,
  36                      BrowserMessageFilter* connection,
  37                      int routing_id,
  38                      int sequence_id,
  39                      size_t nested_msgs_size);
  40
  41   // Adds the given resource host as a pending one. The host is remembered as
  42   // host number |index|, and will ultimately be sent to the plugin to be
  43   // attached to a real resource.
  44   void AddPendingResourceHost(
  45       size_t index,
  46       scoped_ptr<ppapi::host::ResourceHost> resource_host);
  47
  48  private:
  49   friend class base::RefCounted<PendingHostCreator>;
  50
  51   // When the last reference to this class is released, all of the resource
  52   // hosts would have been added. This destructor sends the message to the
  53   // plugin to tell it to attach real hosts to all of the pending hosts that
  54   // have been added by this object.
  55   ~PendingHostCreator();
  56
  57   BrowserPpapiHostImpl* host_;
  58   BrowserMessageFilter* connection_;
  59   int routing_id_;
  60   int sequence_id_;
  61   std::vector<int> pending_resource_host_ids_;
  62 };
  63
  64 PendingHostCreator::PendingHostCreator(BrowserPpapiHostImpl* host,
  65                                        BrowserMessageFilter* connection,
  66                                        int routing_id,
  67                                        int sequence_id,
  68                                        size_t nested_msgs_size)
  69     : host_(host),
  70       connection_(connection),
  71       routing_id_(routing_id),
  72       sequence_id_(sequence_id),
  73       pending_resource_host_ids_(nested_msgs_size, 0) {}
  74
  75 void PendingHostCreator::AddPendingResourceHost(
  76     size_t index,
  77     scoped_ptr<ppapi::host::ResourceHost> resource_host) {
  78   pending_resource_host_ids_[index] =
  79       host_->GetPpapiHost()->AddPendingResourceHost(resource_host.Pass());
  80 }
  81
  82 PendingHostCreator::~PendingHostCreator() {
  83   connection_->Send(new PpapiHostMsg_CreateResourceHostsFromHostReply(
  84       routing_id_, sequence_id_, pending_resource_host_ids_));
  85 }
  86
  87 }  // namespace
  88
  89 PepperRendererConnection::PepperRendererConnection(int render_process_id)
  90     : render_process_id_(render_process_id) {
  91   // Only give the renderer permission for stable APIs.
  92   in_process_host_.reset(new BrowserPpapiHostImpl(this,
  93                                                   ppapi::PpapiPermissions(),
  94                                                   "",
  95                                                   base::FilePath(),
  96                                                   base::FilePath(),
  97                                                   true /* in_process */,
  98                                                   false /* external_plugin */));
  99 }
 100
 101 PepperRendererConnection::~PepperRendererConnection() {
 102 }
 103
 104 BrowserPpapiHostImpl* PepperRendererConnection::GetHostForChildProcess(
 105     int child_process_id) const {
 106   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 107
 108   // Find the plugin which this message refers to. Check NaCl plugins first.
 109   BrowserPpapiHostImpl* host = static_cast<BrowserPpapiHostImpl*>(
 110       GetContentClient()->browser()->GetExternalBrowserPpapiHost(
 111           child_process_id));
 112
 113   if (!host) {
 114     // Check trusted pepper plugins.
 115     for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 116       if (iter->process() &&
 117           iter->process()->GetData().id == child_process_id) {
 118         // Found the plugin.
 119         host = iter->host_impl();
 120         break;
 121       }
 122     }
 123   }
 124
 125   // If the message is being sent from an in-process plugin, we own the
 126   // BrowserPpapiHost.
 127   if (!host && child_process_id == 0) {
 128     host = in_process_host_.get();
 129   }
 130
 131   return host;
 132 }
 133
 134 bool PepperRendererConnection::OnMessageReceived(const IPC::Message& msg,
 135                                                  bool* message_was_ok) {
 136   if (in_process_host_->GetPpapiHost()->OnMessageReceived(msg))
 137     return true;
 138
 139   bool handled = true;
 140   IPC_BEGIN_MESSAGE_MAP_EX(PepperRendererConnection, msg, *message_was_ok)
 141     IPC_MESSAGE_HANDLER(PpapiHostMsg_CreateResourceHostsFromHost,
 142                         OnMsgCreateResourceHostsFromHost)
 143     IPC_MESSAGE_HANDLER(ViewHostMsg_DidCreateInProcessInstance,
 144                         OnMsgDidCreateInProcessInstance)
 145     IPC_MESSAGE_HANDLER(ViewHostMsg_DidDeleteInProcessInstance,
 146                         OnMsgDidDeleteInProcessInstance)
 147     IPC_MESSAGE_UNHANDLED(handled = false)
 148   IPC_END_MESSAGE_MAP_EX()
 149
 150   return handled;
 151 }
 152
 153 void PepperRendererConnection::OnMsgCreateResourceHostsFromHost(
 154     int routing_id,
 155     int child_process_id,
 156     const ppapi::proxy::ResourceMessageCallParams& params,
 157     PP_Instance instance,
 158     const std::vector<IPC::Message>& nested_msgs) {
 159   BrowserPpapiHostImpl* host = GetHostForChildProcess(child_process_id);
 160   if (!host) {
 161     DLOG(ERROR) << "Invalid plugin process ID.";
 162     return;
 163   }
 164
 165   scoped_refptr<PendingHostCreator> creator = new PendingHostCreator(
 166       host, this, routing_id, params.sequence(), nested_msgs.size());
 167   for (size_t i = 0; i < nested_msgs.size(); ++i) {
 168     const IPC::Message& nested_msg = nested_msgs[i];
 169     scoped_ptr<ppapi::host::ResourceHost> resource_host;
 170     if (host->IsValidInstance(instance)) {
 171       if (nested_msg.type() == PpapiHostMsg_FileRef_CreateExternal::ID) {
 172         // FileRef_CreateExternal is only permitted from the renderer. Because
 173         // of this, we handle this message here and not in
 174         // content_browser_pepper_host_factory.cc.
 175         base::FilePath external_path;
 176         if (ppapi::UnpackMessage<PpapiHostMsg_FileRef_CreateExternal>(
 177                 nested_msg, &external_path)) {
 178           resource_host.reset(new PepperFileRefHost(
 179               host, instance, params.pp_resource(), external_path));
 180         }
 181       } else if (nested_msg.type() ==
 182                  PpapiHostMsg_FileSystem_CreateFromRenderer::ID) {
 183         // Similarly, FileSystem_CreateFromRenderer is only permitted from the
 184         // renderer.
 185         std::string root_url;
 186         PP_FileSystemType file_system_type;
 187         if (ppapi::UnpackMessage<PpapiHostMsg_FileSystem_CreateFromRenderer>(
 188                 nested_msg, &root_url, &file_system_type)) {
 189           PepperFileSystemBrowserHost* browser_host =
 190               new PepperFileSystemBrowserHost(host,
 191                                               instance,
 192                                               params.pp_resource(),
 193                                               file_system_type);
 194           resource_host.reset(browser_host);
 195           // Open the file system resource host. This is an asynchronous
 196           // operation, and we must only add the pending resource host and
 197           // send the message once it completes.
 198           browser_host->OpenExisting(
 199               GURL(root_url),
 200               base::Bind(
 201                   &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, 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