Implement proxying for FileRef and FileChooser....

ppapi/proxy/ppb_file_ref_proxy.cc

+// Copyright (c) 2011 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 "ppapi/proxy/ppb_file_ref_proxy.h"
+
+#include "ppapi/c/dev/ppb_file_ref_dev.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/private/ppb_proxy_private.h"
+#include "ppapi/proxy/host_dispatcher.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/serialized_var.h"
+
+namespace pp {
+namespace proxy {
+
+// This object maintains most of the state of the ref in the plugin for fast
+// querying. It's all set in the constructor from the "create info" sent from
+// the host.
+class FileRef : public PluginResource {
+ public:
+  FileRef(const PPBFileRef_CreateInfo& info);
+  virtual ~FileRef();
+
+  virtual FileRef* AsFileRef();
+
+  PP_FileSystemType_Dev file_system_type() const { return file_system_type_; }
+  const PP_Var& path() const { return path_; }
+  const PP_Var& name() const { return name_; }
+
+ private:
+  PP_FileSystemType_Dev file_system_type_;
+  PP_Var path_;
+  PP_Var name_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileRef);
+};
+
+FileRef::FileRef(const PPBFileRef_CreateInfo& info)
+    : PluginResource(info.resource) {
+  Dispatcher* dispatcher = PluginDispatcher::GetForInstance(instance());
+
+  file_system_type_ = static_cast<PP_FileSystemType_Dev>(info.file_system_type);
+
+  name_ = ReceiveSerializedVarReturnValue::Convert(dispatcher, info.name);
+  path_ = ReceiveSerializedVarReturnValue::Convert(dispatcher, info.path);
+}
+
+FileRef::~FileRef() {
+  PluginVarTracker::GetInstance()->Release(path_);
+  PluginVarTracker::GetInstance()->Release(name_);
+}
+
+FileRef* FileRef::AsFileRef() {
+  return this;
+}
+
+namespace {
+
+bool FileRefAndDispatcherForResource(PP_Resource resource,
+                                     FileRef** file_ref,
+                                     Dispatcher** dispatcher) {
+  *file_ref = PluginResource::GetAs<FileRef>(resource);
+  if (!file_ref)
+    return false;
+  *dispatcher = PluginDispatcher::GetForInstance((*file_ref)->instance());
+  return !!(*dispatcher);
+}
+
+PP_Resource Create(PP_Resource file_system, const char* path) {
+  PluginResource* file_system_object =
+      PluginResourceTracker::GetInstance()->GetResourceObject(file_system);
+  if (!file_system_object)
+    return 0;
+
+  Dispatcher* dispatcher =
+      PluginDispatcher::GetForInstance(file_system_object->instance());
+  if (!dispatcher)
+    return 0;
+
+  PPBFileRef_CreateInfo create_info;
+  dispatcher->Send(new PpapiHostMsg_PPBFileRef_Create(
+      INTERFACE_ID_PPB_FILE_REF, file_system_object->host_resource(),
+      path, &create_info));
+  return PPB_FileRef_Proxy::DeserializeFileRef(create_info);
+}
+
+PP_Bool IsFileRef(PP_Resource resource) {
+  FileRef* object = PluginResource::GetAs<FileRef>(resource);
+  return BoolToPPBool(!!object);
+}
+
+PP_FileSystemType_Dev GetFileSystemType(PP_Resource file_ref) {
+  FileRef* object = PluginResource::GetAs<FileRef>(file_ref);
+  if (!object)
+    return PP_FILESYSTEMTYPE_EXTERNAL;
+  return object->file_system_type();
+}
+
+PP_Var GetName(PP_Resource file_ref) {
+  FileRef* object = PluginResource::GetAs<FileRef>(file_ref);
+  if (!object)
+    return PP_MakeUndefined();
+
+  PluginVarTracker::GetInstance()->AddRef(object->name());
+  return object->name();
+}
+
+PP_Var GetPath(PP_Resource file_ref) {
+  FileRef* object = PluginResource::GetAs<FileRef>(file_ref);
+  if (!object)
+    return PP_MakeUndefined();
+
+  PluginVarTracker::GetInstance()->AddRef(object->path());
+  return object->path();
+}
+
+PP_Resource GetParent(PP_Resource file_ref) {
+  FileRef* object;
+  Dispatcher* dispatcher;
+  if (!FileRefAndDispatcherForResource(file_ref, &object, &dispatcher))
+    return 0;
+
+  PPBFileRef_CreateInfo create_info;
+  dispatcher->Send(new PpapiHostMsg_PPBFileRef_GetParent(
+      INTERFACE_ID_PPB_FILE_REF, object->host_resource(), &create_info));
+  return PPB_FileRef_Proxy::DeserializeFileRef(create_info);
+}
+
+int32_t MakeDirectory(PP_Resource directory_ref,
+                      PP_Bool make_ancestors,
+                      struct PP_CompletionCallback callback) {
+  FileRef* object;
+  Dispatcher* dispatcher;
+  if (!FileRefAndDispatcherForResource(directory_ref, &object, &dispatcher))
+    return PP_ERROR_BADRESOURCE;
+
+  dispatcher->Send(new PpapiHostMsg_PPBFileRef_MakeDirectory(
+      INTERFACE_ID_PPB_FILE_REF, object->host_resource(), make_ancestors,
+      dispatcher->callback_tracker().SendCallback(callback)));
+  return PP_ERROR_WOULDBLOCK;
+}
+
+int32_t Touch(PP_Resource file_ref,
+              PP_Time last_access_time,
+              PP_Time last_modified_time,
+              struct PP_CompletionCallback callback) {
+  FileRef* object;
+  Dispatcher* dispatcher;
+  if (!FileRefAndDispatcherForResource(file_ref, &object, &dispatcher))
+    return PP_ERROR_BADRESOURCE;
+
+  dispatcher->Send(new PpapiHostMsg_PPBFileRef_Touch(
+      INTERFACE_ID_PPB_FILE_REF, object->host_resource(),
+      last_access_time, last_modified_time,
+      dispatcher->callback_tracker().SendCallback(callback)));
+  return PP_ERROR_WOULDBLOCK;
+}
+
+int32_t Delete(PP_Resource file_ref,
+               struct PP_CompletionCallback callback) {
+  FileRef* object;
+  Dispatcher* dispatcher;
+  if (!FileRefAndDispatcherForResource(file_ref, &object, &dispatcher))
+    return PP_ERROR_BADRESOURCE;
+
+  dispatcher->Send(new PpapiHostMsg_PPBFileRef_Delete(
+      INTERFACE_ID_PPB_FILE_REF, object->host_resource(),
+      dispatcher->callback_tracker().SendCallback(callback)));
+  return PP_ERROR_WOULDBLOCK;
+}
+
+int32_t Rename(PP_Resource file_ref,
+               PP_Resource new_file_ref,
+               struct PP_CompletionCallback callback) {
+  FileRef* obj1;
+  Dispatcher* dispatcher1;
+  if (!FileRefAndDispatcherForResource(file_ref, &obj1, &dispatcher1))
+    return PP_ERROR_BADRESOURCE;
+
+  FileRef* obj2;
+  Dispatcher* dispatcher2;
+  if (!FileRefAndDispatcherForResource(new_file_ref, &obj2, &dispatcher2))
+    return PP_ERROR_BADRESOURCE;
+
+  if (obj1->instance() != obj2->instance())
+    return PP_ERROR_BADRESOURCE;
+
+  dispatcher1->Send(new PpapiHostMsg_PPBFileRef_Rename(
+      INTERFACE_ID_PPB_FILE_REF, obj1->host_resource(),
+      obj2->host_resource(),
+      dispatcher1->callback_tracker().SendCallback(callback)));
+  return PP_ERROR_WOULDBLOCK;
+}
+
+const PPB_FileRef_Dev file_ref_interface = {
+  &Create,
+  &IsFileRef,
+  &GetFileSystemType,
+  &GetName,
+  &GetPath,
+  &GetParent,
+  &MakeDirectory,
+  &Touch,
+  &Delete,
+  &Rename
+};
+
+InterfaceProxy* CreateFileRefProxy(Dispatcher* dispatcher,
+                                   const void* target_interface) {
+  return new PPB_FileRef_Proxy(dispatcher, target_interface);
+}
+
+}  // namespace
+
+PPB_FileRef_Proxy::PPB_FileRef_Proxy(Dispatcher* dispatcher,
+                                     const void* target_interface)
+    : InterfaceProxy(dispatcher, target_interface) {
+}
+
+PPB_FileRef_Proxy::~PPB_FileRef_Proxy() {
+}
+
+const InterfaceProxy::Info* PPB_FileRef_Proxy::GetInfo() {
+  static const Info info = {
+    &file_ref_interface,
+    PPB_FILEREF_DEV_INTERFACE,
+    INTERFACE_ID_PPB_FILE_REF,
+    false,
+    &CreateFileRefProxy,
+  };
+  return &info;
+}
+
+bool PPB_FileRef_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PPB_FileRef_Proxy, msg)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Create, OnMsgCreate)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_GetParent, OnMsgGetParent)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_MakeDirectory,
+                        OnMsgMakeDirectory)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Touch, OnMsgTouch)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Delete, OnMsgDelete)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Rename, OnMsgRename)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void PPB_FileRef_Proxy::SerializeFileRef(PP_Resource file_ref,
+                                         PPBFileRef_CreateInfo* result) {
+  // We need the instance out of the resource for serializing back to the
+  // plugin. This code can only run in the host.
+  if (dispatcher()->IsPlugin()) {
+    NOTREACHED();
+    return;
+  }
+  HostDispatcher* host_dispatcher = static_cast<HostDispatcher*>(dispatcher());
+  PP_Instance instance =
+      host_dispatcher->GetPPBProxy()->GetInstanceForResource(file_ref);
+
+  result->resource.SetHostResource(instance, file_ref);
+  result->file_system_type =
+      static_cast<int>(ppb_file_ref_target()->GetFileSystemType(file_ref));
+  result->path = SerializedVarReturnValue::Convert(
+      dispatcher(),
+      ppb_file_ref_target()->GetPath(file_ref));
+  result->name = SerializedVarReturnValue::Convert(
+      dispatcher(),
+      ppb_file_ref_target()->GetName(file_ref));
+}
+
+// static
+PP_Resource PPB_FileRef_Proxy::DeserializeFileRef(
+    const PPBFileRef_CreateInfo& serialized) {
+  if (serialized.resource.is_null())
+    return 0;  // Resource invalid.
+
+  linked_ptr<FileRef> object(new FileRef(serialized));
+  return PluginResourceTracker::GetInstance()->AddResource(object);
+}
+
+void PPB_FileRef_Proxy::OnMsgCreate(const HostResource& file_system,
+                                    const std::string& path,
+                                    PPBFileRef_CreateInfo* result) {
+
+  PP_Resource resource = ppb_file_ref_target()->Create(
+      file_system.host_resource(), path.c_str());
+  if (!resource)
+    return;  // CreateInfo default constructor initializes to 0.
+  SerializeFileRef(resource, result);
+}
+
+void PPB_FileRef_Proxy::OnMsgGetParent(const HostResource& host_resource,
+                                       PPBFileRef_CreateInfo* result) {
+  PP_Resource resource = ppb_file_ref_target()->GetParent(
+      host_resource.host_resource());
+  if (!resource)
+    return;  // CreateInfo default constructor initializes to 0.
+  SerializeFileRef(resource, result);
+}
+
+void PPB_FileRef_Proxy::OnMsgMakeDirectory(const HostResource& host_resource,
+                                           PP_Bool make_ancestors,
+                                           uint32_t serialized_callback) {
+  PP_CompletionCallback callback = ReceiveCallback(serialized_callback);
+  int32_t result =
+      ppb_file_ref_target()->MakeDirectory(host_resource.host_resource(),
+                                           make_ancestors, callback);
+  if (result != PP_ERROR_WOULDBLOCK)
+    PP_RunCompletionCallback(&callback, result);
+}
+
+void PPB_FileRef_Proxy::OnMsgTouch(const HostResource& host_resource,
+                                   PP_Time last_access,
+                                   PP_Time last_modified,
+                                   uint32_t serialized_callback) {
+  PP_CompletionCallback callback = ReceiveCallback(serialized_callback);
+  int32_t result =
+      ppb_file_ref_target()->Touch(host_resource.host_resource(),
+                                   last_access, last_modified, callback);
+  if (result != PP_ERROR_WOULDBLOCK)
+    PP_RunCompletionCallback(&callback, result);
+}
+
+void PPB_FileRef_Proxy::OnMsgDelete(const HostResource& host_resource,
+                                    uint32_t serialized_callback) {
+  PP_CompletionCallback callback = ReceiveCallback(serialized_callback);
+  int32_t result =
+      ppb_file_ref_target()->Delete(host_resource.host_resource(), callback);
+  if (result != PP_ERROR_WOULDBLOCK)
+    PP_RunCompletionCallback(&callback, result);
+}
+
+void PPB_FileRef_Proxy::OnMsgRename(const HostResource& file_ref,
+                                    const HostResource& new_file_ref,
+                                    uint32_t serialized_callback) {
+  PP_CompletionCallback callback = ReceiveCallback(serialized_callback);
+  int32_t result =
+      ppb_file_ref_target()->Rename(file_ref.host_resource(),
+                                    new_file_ref.host_resource(),
+                                    callback);
+  if (result != PP_ERROR_WOULDBLOCK)
+    PP_RunCompletionCallback(&callback, result);
+}
+
+}  // namespace proxy
+}  // namespace pp