// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/pepper/host_dispatcher_wrapper.h"

#include "build/build_config.h"
#include "content/common/frame_messages.h"
#include "content/public/common/origin_util.h"
#include "content/renderer/pepper/pepper_hung_plugin_filter.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/pepper/pepper_proxy_channel_delegate_impl.h"
#include "content/renderer/pepper/plugin_module.h"
#include "content/renderer/pepper/renderer_ppapi_host_impl.h"
#include "content/renderer/pepper/renderer_restrict_dispatch_group.h"
#include "content/renderer/render_frame_impl.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebPluginContainer.h"

namespace content {

HostDispatcherWrapper::HostDispatcherWrapper(
    PluginModule* module,
    base::ProcessId peer_pid,
    int plugin_child_id,
    const ppapi::PpapiPermissions& perms,
    bool is_external)
    : module_(module),
      peer_pid_(peer_pid),
      plugin_child_id_(plugin_child_id),
      permissions_(perms),
      is_external_(is_external) {}

HostDispatcherWrapper::~HostDispatcherWrapper() {}

bool HostDispatcherWrapper::Init(const IPC::ChannelHandle& channel_handle,
                                 PP_GetInterface_Func local_get_interface,
                                 const ppapi::Preferences& preferences,
                                 scoped_refptr<PepperHungPluginFilter> filter) {
  if (!channel_handle.is_mojo_channel_handle())
    return false;

  dispatcher_delegate_.reset(new PepperProxyChannelDelegateImpl);
  dispatcher_.reset(new ppapi::proxy::HostDispatcher(
      module_->pp_module(), local_get_interface, permissions_));
  // The HungPluginFilter needs to know when we are blocked on a sync message
  // to the plugin. Note the filter outlives the dispatcher, so there is no
  // need to remove it as an observer.
  dispatcher_->AddSyncMessageStatusObserver(filter.get());
  // Guarantee the hung_plugin_filter_ outlives |dispatcher_|.
  hung_plugin_filter_ = filter;

  if (!dispatcher_->InitHostWithChannel(dispatcher_delegate_.get(),
                                        peer_pid_,
                                        channel_handle,
                                        true,  // Client.
                                        preferences)) {
    dispatcher_.reset();
    dispatcher_delegate_.reset();
    return false;
  }
  // HungPluginFilter needs to listen for some messages on the IO thread.
  dispatcher_->AddIOThreadMessageFilter(filter);

  dispatcher_->channel()->SetRestrictDispatchChannelGroup(
      kRendererRestrictDispatchGroup_Pepper);
  return true;
}

const void* HostDispatcherWrapper::GetProxiedInterface(const char* name) {
  return dispatcher_->GetProxiedInterface(name);
}

void HostDispatcherWrapper::AddInstance(PP_Instance instance) {
  ppapi::proxy::HostDispatcher::SetForInstance(instance, dispatcher_.get());

  RendererPpapiHostImpl* host =
      RendererPpapiHostImpl::GetForPPInstance(instance);
  // TODO(brettw) remove this null check when the old-style pepper-based
  // browser tag is removed from this file. Getting this notification should
  // always give us an instance we can find in the map otherwise, but that
  // isn't true for browser tag support.
  if (host) {
    RenderFrame* render_frame = host->GetRenderFrameForInstance(instance);
    PepperPluginInstance* plugin_instance = host->GetPluginInstance(instance);
    bool is_privileged_context =
        plugin_instance->GetContainer()->GetDocument().IsSecureContext() &&
        content::IsOriginSecure(plugin_instance->GetPluginURL());
    render_frame->Send(new FrameHostMsg_DidCreateOutOfProcessPepperInstance(
        plugin_child_id_, instance,
        PepperRendererInstanceData(
            0,  // The render process id will be supplied in the browser.
            render_frame->GetRoutingID(), host->GetDocumentURL(instance),
            plugin_instance->GetPluginURL(), is_privileged_context),
        is_external_));
  }
}

void HostDispatcherWrapper::RemoveInstance(PP_Instance instance) {
  ppapi::proxy::HostDispatcher::RemoveForInstance(instance);

  RendererPpapiHostImpl* host =
      RendererPpapiHostImpl::GetForPPInstance(instance);
  // TODO(brettw) remove null check as described in AddInstance.
  if (host) {
    RenderFrame* render_frame = host->GetRenderFrameForInstance(instance);
    if (render_frame) {
      render_frame->Send(new FrameHostMsg_DidDeleteOutOfProcessPepperInstance(
          plugin_child_id_, instance, is_external_));
    }
  }
}

}  // namespace content