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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/proxy/plugin_message_filter.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/task/single_thread_task_runner.h"
#include "ipc/ipc_channel.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/resource_message_params.h"
#include "ppapi/proxy/resource_reply_thread_registrar.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/proxy_lock.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/shared_impl/resource_tracker.h"
namespace ppapi {
namespace proxy {
PluginMessageFilter::PluginMessageFilter(
std::set<PP_Instance>* seen_instance_ids,
scoped_refptr<ResourceReplyThreadRegistrar> registrar)
: seen_instance_ids_(seen_instance_ids),
resource_reply_thread_registrar_(registrar),
sender_(NULL) {
}
PluginMessageFilter::~PluginMessageFilter() {
}
void PluginMessageFilter::OnFilterAdded(IPC::Channel* channel) {
sender_ = channel;
}
void PluginMessageFilter::OnFilterRemoved() {
sender_ = NULL;
}
bool PluginMessageFilter::OnMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PluginMessageFilter, message)
IPC_MESSAGE_HANDLER(PpapiMsg_ReserveInstanceId, OnMsgReserveInstanceId)
IPC_MESSAGE_HANDLER(PpapiPluginMsg_ResourceReply, OnMsgResourceReply)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
bool PluginMessageFilter::Send(IPC::Message* msg) {
if (sender_)
return sender_->Send(msg);
delete msg;
return false;
}
void PluginMessageFilter::AddResourceMessageFilter(
const scoped_refptr<ResourceMessageFilter>& filter) {
resource_filters_.push_back(filter);
}
// static
void PluginMessageFilter::DispatchResourceReplyForTest(
const ResourceMessageReplyParams& reply_params,
const IPC::Message& nested_msg) {
DispatchResourceReply(reply_params, nested_msg);
}
void PluginMessageFilter::OnMsgReserveInstanceId(PP_Instance instance,
bool* usable) {
// If |seen_instance_ids_| is set to NULL, we are not supposed to see this
// message.
CHECK(seen_instance_ids_);
// See the message definition for how this works.
if (seen_instance_ids_->find(instance) != seen_instance_ids_->end()) {
// Instance ID already seen, reject it.
*usable = false;
return;
}
// This instance ID is new so we can return that it's usable and mark it as
// used for future reference.
seen_instance_ids_->insert(instance);
*usable = true;
}
void PluginMessageFilter::OnMsgResourceReply(
const ResourceMessageReplyParams& reply_params,
const IPC::Message& nested_msg) {
for (const auto& filter_ptr : resource_filters_) {
if (filter_ptr->OnResourceReplyReceived(reply_params, nested_msg))
return;
}
scoped_refptr<base::SingleThreadTaskRunner> target =
resource_reply_thread_registrar_->GetTargetThread(reply_params,
nested_msg);
target->PostTask(FROM_HERE, base::BindOnce(&DispatchResourceReply,
reply_params, nested_msg));
}
// static
void PluginMessageFilter::DispatchResourceReply(
const ResourceMessageReplyParams& reply_params,
const IPC::Message& nested_msg) {
ProxyAutoLock lock;
Resource* resource = PpapiGlobals::Get()->GetResourceTracker()->GetResource(
reply_params.pp_resource());
if (!resource) {
DVLOG_IF(1, reply_params.sequence() != 0)
<< "Pepper resource reply message received but the resource doesn't "
"exist (probably has been destroyed).";
return;
}
resource->OnReplyReceived(reply_params, nested_msg);
}
} // namespace proxy
} // namespace ppapi
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