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// 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 "webkit/fileapi/file_util_helper.h"
#include <stack>
#include <utility>
#include "webkit/fileapi/file_system_file_util.h"
#include "webkit/fileapi/file_system_operation_context.h"
#include "webkit/fileapi/file_system_url.h"
#include "webkit/fileapi/file_system_util.h"
using base::PlatformFileError;
namespace fileapi {
namespace {
// A helper class to delete a temporary file.
class ScopedFileDeleter {
public:
explicit ScopedFileDeleter(const base::FilePath& path) : path_(path) {}
~ScopedFileDeleter() {
file_util::Delete(path_, false /* recursive */);
}
private:
base::FilePath path_;
};
bool IsInRoot(const FileSystemURL& url) {
// If path is in the root, path.DirName() will be ".",
// since we use paths with no leading '/'.
base::FilePath parent = url.path().DirName();
return parent.empty() || parent == base::FilePath(FILE_PATH_LITERAL("."));
}
// A helper class for cross-FileUtil Copy/Move operations.
class CrossFileUtilHelper {
public:
enum Operation {
OPERATION_COPY,
OPERATION_MOVE
};
CrossFileUtilHelper(FileSystemOperationContext* context,
FileSystemFileUtil* src_util,
FileSystemFileUtil* dest_util,
const FileSystemURL& src_url,
const FileSystemURL& dest_url,
Operation operation);
~CrossFileUtilHelper();
base::PlatformFileError DoWork();
private:
// Performs common pre-operation check and preparation.
// This may delete the destination directory if it's empty.
base::PlatformFileError PerformErrorCheckAndPreparation();
// Performs recursive copy or move by calling CopyOrMoveFile for individual
// files. Operations for recursive traversal are encapsulated in this method.
// It assumes src_url and dest_url have passed
// PerformErrorCheckAndPreparationForMoveAndCopy().
base::PlatformFileError CopyOrMoveDirectory(
const FileSystemURL& src_url,
const FileSystemURL& dest_url);
// Determines whether a simple same-filesystem move or copy can be done. If
// so, it delegates to CopyOrMoveFile. Otherwise it looks up the true
// platform path of the source file, delegates to CopyInForeignFile, and [for
// move] calls DeleteFile on the source file.
base::PlatformFileError CopyOrMoveFile(
const FileSystemURL& src_url,
const FileSystemURL& dest_url);
FileSystemOperationContext* context_;
FileSystemFileUtil* src_util_; // Not owned.
FileSystemFileUtil* dest_util_; // Not owned.
const FileSystemURL& src_root_url_;
const FileSystemURL& dest_root_url_;
Operation operation_;
bool same_file_system_;
DISALLOW_COPY_AND_ASSIGN(CrossFileUtilHelper);
};
CrossFileUtilHelper::CrossFileUtilHelper(
FileSystemOperationContext* context,
FileSystemFileUtil* src_util,
FileSystemFileUtil* dest_util,
const FileSystemURL& src_url,
const FileSystemURL& dest_url,
Operation operation)
: context_(context),
src_util_(src_util),
dest_util_(dest_util),
src_root_url_(src_url),
dest_root_url_(dest_url),
operation_(operation) {
DCHECK(src_util_);
DCHECK(dest_util_);
same_file_system_ =
src_root_url_.origin() == dest_root_url_.origin() &&
src_root_url_.type() == dest_root_url_.type();
}
CrossFileUtilHelper::~CrossFileUtilHelper() {}
base::PlatformFileError CrossFileUtilHelper::DoWork() {
// It is an error to try to copy/move an entry into its child.
if (same_file_system_ && src_root_url_.path().IsParent(dest_root_url_.path()))
return base::PLATFORM_FILE_ERROR_INVALID_OPERATION;
// It is an error to copy/move an entry into the same path.
if (same_file_system_ &&
src_root_url_.path() == dest_root_url_.path())
return base::PLATFORM_FILE_ERROR_EXISTS;
// First try to copy/move the file.
base::PlatformFileError error = CopyOrMoveFile(src_root_url_, dest_root_url_);
if (error == base::PLATFORM_FILE_OK ||
error != base::PLATFORM_FILE_ERROR_NOT_A_FILE)
return error;
// Now we should be sure that the source (and destination if exists)
// is directory.
// Now let's try to remove the destination directory, this must
// fail if the directory isn't empty or its parent doesn't exist.
error = dest_util_->DeleteDirectory(context_, dest_root_url_);
if (error == base::PLATFORM_FILE_ERROR_NOT_A_DIRECTORY)
return base::PLATFORM_FILE_ERROR_INVALID_OPERATION;
if (error != base::PLATFORM_FILE_OK &&
error != base::PLATFORM_FILE_ERROR_NOT_FOUND)
return error;
// Perform the actual work for directory copy/move.
return CopyOrMoveDirectory(src_root_url_, dest_root_url_);
}
PlatformFileError CrossFileUtilHelper::CopyOrMoveDirectory(
const FileSystemURL& src_url,
const FileSystemURL& dest_url) {
// At this point we must have gone through
// PerformErrorCheckAndPreparationForMoveAndCopy so this must be true.
DCHECK(!same_file_system_ ||
!src_url.path().IsParent(dest_url.path()));
PlatformFileError error = dest_util_->CreateDirectory(
context_, dest_url, false /* exclusive */, false /* recursive */);
if (error != base::PLATFORM_FILE_OK)
return error;
typedef std::pair<FileSystemURL, base::Time> MovedDirectoryPair;
typedef std::vector<MovedDirectoryPair> MovedDirectories;
MovedDirectories directories;
// Store modified timestamp of the root directory.
if (operation_ == OPERATION_MOVE) {
base::PlatformFileInfo file_info;
base::FilePath platform_file_path;
error = src_util_->GetFileInfo(
context_, src_url, &file_info, &platform_file_path);
if (error != base::PLATFORM_FILE_OK)
return error;
directories.push_back(
std::make_pair(dest_url, file_info.last_modified));
}
scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> file_enum(
src_util_->CreateFileEnumerator(context_,
src_url,
true /* recursive */));
base::FilePath src_file_path_each;
while (!(src_file_path_each = file_enum->Next()).empty()) {
base::FilePath dest_file_path_each(dest_url.path());
src_url.path().AppendRelativePath(
src_file_path_each, &dest_file_path_each);
if (file_enum->IsDirectory()) {
error = dest_util_->CreateDirectory(
context_,
dest_url.WithPath(dest_file_path_each),
true /* exclusive */, false /* recursive */);
if (error != base::PLATFORM_FILE_OK)
return error;
directories.push_back(std::make_pair(
dest_url.WithPath(dest_file_path_each),
file_enum->LastModifiedTime()));
} else {
error = CopyOrMoveFile(src_url.WithPath(src_file_path_each),
dest_url.WithPath(dest_file_path_each));
if (error != base::PLATFORM_FILE_OK)
return error;
}
}
if (operation_ == OPERATION_MOVE) {
// Restore modified timestamp of destination directories.
for (MovedDirectories::const_iterator it(directories.begin());
it != directories.end(); ++it) {
error = dest_util_->Touch(context_, it->first, it->second, it->second);
if (error != base::PLATFORM_FILE_OK)
return error;
}
error = FileUtilHelper::Delete(
context_, src_util_, src_url, true /* recursive */);
if (error != base::PLATFORM_FILE_OK)
return error;
}
return base::PLATFORM_FILE_OK;
}
PlatformFileError CrossFileUtilHelper::CopyOrMoveFile(
const FileSystemURL& src_url,
const FileSystemURL& dest_url) {
if (same_file_system_) {
DCHECK(src_util_ == dest_util_);
// Source and destination are in the same FileSystemFileUtil; now we can
// safely call FileSystemFileUtil method on src_util_ (== dest_util_).
return src_util_->CopyOrMoveFile(context_, src_url, dest_url,
operation_ == OPERATION_COPY);
}
// Resolve the src_url's underlying file path.
base::PlatformFileInfo file_info;
base::FilePath platform_file_path;
SnapshotFilePolicy snapshot_policy;
PlatformFileError error = src_util_->CreateSnapshotFile(
context_, src_url, &file_info, &platform_file_path, &snapshot_policy);
if (error != base::PLATFORM_FILE_OK)
return error;
// For now we don't support non-snapshot file case.
// TODO(kinuko): Address this case too.
DCHECK(!platform_file_path.empty());
scoped_ptr<ScopedFileDeleter> file_deleter;
if (snapshot_policy == kSnapshotFileTemporary)
file_deleter.reset(new ScopedFileDeleter(platform_file_path));
// Call CopyInForeignFile() on the dest_util_ with the resolved source path
// to perform limited cross-FileSystemFileUtil copy/move.
error = dest_util_->CopyInForeignFile(
context_, platform_file_path, dest_url);
if (operation_ == OPERATION_COPY || error != base::PLATFORM_FILE_OK)
return error;
return src_util_->DeleteFile(context_, src_url);
}
} // anonymous namespace
// static
bool FileUtilHelper::DirectoryExists(FileSystemOperationContext* context,
FileSystemFileUtil* file_util,
const FileSystemURL& url) {
if (url.path().empty())
return true;
base::PlatformFileInfo file_info;
base::FilePath platform_path;
PlatformFileError error = file_util->GetFileInfo(
context, url, &file_info, &platform_path);
return error == base::PLATFORM_FILE_OK && file_info.is_directory;
}
// static
base::PlatformFileError FileUtilHelper::Copy(
FileSystemOperationContext* context,
FileSystemFileUtil* src_file_util,
FileSystemFileUtil* dest_file_util,
const FileSystemURL& src_root_url,
const FileSystemURL& dest_root_url) {
return CrossFileUtilHelper(context, src_file_util, dest_file_util,
src_root_url, dest_root_url,
CrossFileUtilHelper::OPERATION_COPY).DoWork();
}
// static
base::PlatformFileError FileUtilHelper::Move(
FileSystemOperationContext* context,
FileSystemFileUtil* src_file_util,
FileSystemFileUtil* dest_file_util,
const FileSystemURL& src_root_url,
const FileSystemURL& dest_root_url) {
return CrossFileUtilHelper(context, src_file_util, dest_file_util,
src_root_url, dest_root_url,
CrossFileUtilHelper::OPERATION_MOVE).DoWork();
}
// static
base::PlatformFileError FileUtilHelper::Delete(
FileSystemOperationContext* context,
FileSystemFileUtil* file_util,
const FileSystemURL& url,
bool recursive) {
if (DirectoryExists(context, file_util, url)) {
if (!recursive)
return file_util->DeleteDirectory(context, url);
else
return DeleteDirectoryRecursive(context, file_util, url);
} else {
return file_util->DeleteFile(context, url);
}
}
// static
base::PlatformFileError FileUtilHelper::ReadDirectory(
FileSystemOperationContext* context,
FileSystemFileUtil* file_util,
const FileSystemURL& url,
std::vector<base::FileUtilProxy::Entry>* entries) {
DCHECK(entries);
base::PlatformFileInfo file_info;
base::FilePath platform_path;
PlatformFileError error = file_util->GetFileInfo(
context, url, &file_info, &platform_path);
if (error != base::PLATFORM_FILE_OK)
return error;
if (!file_info.is_directory)
return base::PLATFORM_FILE_ERROR_NOT_A_DIRECTORY;
scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> file_enum(
file_util->CreateFileEnumerator(context, url, false /* recursive */));
base::FilePath current;
while (!(current = file_enum->Next()).empty()) {
base::FileUtilProxy::Entry entry;
entry.is_directory = file_enum->IsDirectory();
entry.name = VirtualPath::BaseName(current).value();
entry.size = file_enum->Size();
entry.last_modified_time = file_enum->LastModifiedTime();
entries->push_back(entry);
}
return base::PLATFORM_FILE_OK;
}
// static
base::PlatformFileError FileUtilHelper::DeleteDirectoryRecursive(
FileSystemOperationContext* context,
FileSystemFileUtil* file_util,
const FileSystemURL& url) {
scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> file_enum(
file_util->CreateFileEnumerator(context, url, true /* recursive */));
base::FilePath file_path_each;
std::stack<base::FilePath> directories;
while (!(file_path_each = file_enum->Next()).empty()) {
if (file_enum->IsDirectory()) {
directories.push(file_path_each);
} else {
PlatformFileError error = file_util->DeleteFile(
context, url.WithPath(file_path_each));
if (error != base::PLATFORM_FILE_ERROR_NOT_FOUND &&
error != base::PLATFORM_FILE_OK)
return error;
}
}
while (!directories.empty()) {
PlatformFileError error = file_util->DeleteDirectory(
context, url.WithPath(directories.top()));
if (error != base::PLATFORM_FILE_ERROR_NOT_FOUND &&
error != base::PLATFORM_FILE_OK)
return error;
directories.pop();
}
return file_util->DeleteDirectory(context, url);
}
} // namespace fileapi
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