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// Copyright (c) 2010 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 "chrome/browser/renderer_host/file_utilities_dispatcher_host.h"
#include "base/file_util.h"
#include "base/platform_file.h"
#include "chrome/browser/child_process_security_policy.h"
#include "chrome/browser/browser_thread.h"
#include "chrome/common/render_messages.h"
#include "chrome/common/render_messages_params.h"
namespace {
void WriteFileSize(IPC::Message* reply_msg,
const base::PlatformFileInfo& file_info) {
ViewHostMsg_GetFileSize::WriteReplyParams(reply_msg, file_info.size);
}
void WriteFileModificationTime(IPC::Message* reply_msg,
const base::PlatformFileInfo& file_info) {
ViewHostMsg_GetFileModificationTime::WriteReplyParams(
reply_msg, file_info.last_modified);
}
} // namespace
FileUtilitiesDispatcherHost::FileUtilitiesDispatcherHost(
IPC::Message::Sender* sender, int process_id)
: message_sender_(sender),
process_id_(process_id),
process_handle_(0),
shutdown_(false) {
DCHECK(message_sender_);
}
FileUtilitiesDispatcherHost::~FileUtilitiesDispatcherHost() {
}
void FileUtilitiesDispatcherHost::Init(base::ProcessHandle process_handle) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK(!shutdown_);
DCHECK(!process_handle_);
DCHECK(process_handle);
process_handle_ = process_handle;
}
void FileUtilitiesDispatcherHost::Shutdown() {
message_sender_ = NULL;
shutdown_ = true;
}
bool FileUtilitiesDispatcherHost::OnMessageReceived(
const IPC::Message& message, bool* message_was_ok) {
DCHECK(!shutdown_);
*message_was_ok = true;
bool handled = true;
IPC_BEGIN_MESSAGE_MAP_EX(FileUtilitiesDispatcherHost,
message, *message_was_ok)
IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_GetFileSize, OnGetFileSize)
IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_GetFileModificationTime,
OnGetFileModificationTime)
IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_OpenFile, OnOpenFile)
IPC_MESSAGE_UNHANDLED((handled = false, msg_is_ok__ = true))
IPC_END_MESSAGE_MAP_EX()
return handled;
}
void FileUtilitiesDispatcherHost::OnGetFileSize(
const FilePath& path, IPC::Message* reply_msg) {
// Get file size only when the child process has been granted permission to
// upload the file.
if (!ChildProcessSecurityPolicy::GetInstance()->CanReadFile(
process_id_, path)) {
ViewHostMsg_GetFileSize::WriteReplyParams(
reply_msg, static_cast<int64>(-1));
Send(reply_msg);
return;
}
// Getting file size could take long time if it lives on a network share,
// so run it on FILE thread.
BrowserThread::PostTask(
BrowserThread::FILE, FROM_HERE,
NewRunnableMethod(
this, &FileUtilitiesDispatcherHost::OnGetFileInfoOnFileThread, path,
reply_msg, &WriteFileSize));
}
void FileUtilitiesDispatcherHost::OnGetFileModificationTime(
const FilePath& path, IPC::Message* reply_msg) {
// Get file modification time only when the child process has been granted
// permission to upload the file.
if (!ChildProcessSecurityPolicy::GetInstance()->CanReadFile(
process_id_, path)) {
ViewHostMsg_GetFileModificationTime::WriteReplyParams(reply_msg,
base::Time());
Send(reply_msg);
return;
}
// Getting file modification time could take a long time if it lives on a
// network share, so run it on the FILE thread.
BrowserThread::PostTask(
BrowserThread::FILE, FROM_HERE,
NewRunnableMethod(
this, &FileUtilitiesDispatcherHost::OnGetFileInfoOnFileThread,
path, reply_msg, &WriteFileModificationTime));
}
void FileUtilitiesDispatcherHost::OnGetFileInfoOnFileThread(
const FilePath& path,
IPC::Message* reply_msg,
FileInfoWriteFunc write_func) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
base::PlatformFileInfo file_info;
file_info.size = 0;
file_util::GetFileInfo(path, &file_info);
(*write_func)(reply_msg, file_info);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
NewRunnableMethod(this, &FileUtilitiesDispatcherHost::Send, reply_msg));
}
void FileUtilitiesDispatcherHost::OnOpenFile(
const FilePath& path, int mode, IPC::Message* reply_msg) {
// Open the file only when the child process has been granted permission to
// upload the file.
// TODO(jianli): Do we need separate permission to control opening the file?
if (!ChildProcessSecurityPolicy::GetInstance()->CanReadFile(
process_id_, path)) {
ViewHostMsg_OpenFile::WriteReplyParams(
reply_msg,
#if defined(OS_WIN)
base::kInvalidPlatformFileValue
#elif defined(OS_POSIX)
base::FileDescriptor(base::kInvalidPlatformFileValue, true)
#endif
);
Send(reply_msg);
return;
}
// Opening the file could take a long time if it lives on a network share,
// so run it on the FILE thread.
BrowserThread::PostTask(
BrowserThread::FILE, FROM_HERE,
NewRunnableMethod(
this, &FileUtilitiesDispatcherHost::OnOpenFileOnFileThread,
path, mode, reply_msg));
}
void FileUtilitiesDispatcherHost::OnOpenFileOnFileThread(
const FilePath& path, int mode, IPC::Message* reply_msg) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
base::PlatformFile file_handle = base::CreatePlatformFile(
path,
(mode == 0) ? (base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ)
: (base::PLATFORM_FILE_CREATE_ALWAYS |
base::PLATFORM_FILE_WRITE),
NULL, NULL);
base::PlatformFile target_file_handle;
#if defined(OS_WIN)
// Duplicate the file handle so that the renderer process can access the file.
if (!DuplicateHandle(GetCurrentProcess(), file_handle,
process_handle_, &target_file_handle, 0, false,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
// file_handle is closed whether or not DuplicateHandle succeeds.
target_file_handle = INVALID_HANDLE_VALUE;
}
#else
target_file_handle = file_handle;
#endif
ViewHostMsg_OpenFile::WriteReplyParams(
reply_msg,
#if defined(OS_WIN)
target_file_handle
#elif defined(OS_POSIX)
base::FileDescriptor(target_file_handle, true)
#endif
);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
NewRunnableMethod(this, &FileUtilitiesDispatcherHost::Send, reply_msg));
}
void FileUtilitiesDispatcherHost::Send(IPC::Message* message) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (!shutdown_ && message_sender_)
message_sender_->Send(message);
else
delete message;
}
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