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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/isolated_context.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/string_number_conversions.h"
#include "base/string_util.h"
namespace fileapi {
static base::LazyInstance<IsolatedContext>::Leaky g_isolated_context =
LAZY_INSTANCE_INITIALIZER;
// static
IsolatedContext* IsolatedContext::GetInstance() {
return g_isolated_context.Pointer();
}
std::string IsolatedContext::RegisterIsolatedFileSystem(
const std::set<FilePath>& files) {
base::AutoLock locker(lock_);
std::string filesystem_id = GetNewFileSystemId();
// Stores basename to fullpath map, as we store the basenames as
// the filesystem's toplevel entries.
PathMap toplevels;
for (std::set<FilePath>::const_iterator iter = files.begin();
iter != files.end(); ++iter) {
// The given path should not contain any '..' and should be absolute.
if (iter->ReferencesParent() || !iter->IsAbsolute())
continue;
// Register the basename -> fullpath map. (We only expose the basename
// part to the user scripts)
FilePath fullpath = iter->NormalizePathSeparators();
FilePath basename = iter->BaseName();
// TODO(kinuko): Append a suffix or something if we have multiple pathnames
// with the same basename. For now we only register the first one.
toplevels.insert(std::make_pair(basename, fullpath));
}
// TODO(kinuko): we may not want to register the file system if there're
// no valid paths in the given file set.
toplevel_map_[filesystem_id] = toplevels;
// Each file system is created with refcount == 0.
ref_counts_[filesystem_id] = 0;
return filesystem_id;
}
void IsolatedContext::RevokeIsolatedFileSystem(
const std::string& filesystem_id) {
base::AutoLock locker(lock_);
RevokeWithoutLocking(filesystem_id);
}
void IsolatedContext::AddReference(const std::string& filesystem_id) {
base::AutoLock locker(lock_);
DCHECK(ref_counts_.find(filesystem_id) != ref_counts_.end());
ref_counts_[filesystem_id]++;
}
void IsolatedContext::RemoveReference(const std::string& filesystem_id) {
base::AutoLock locker(lock_);
// This could get called for non-existent filesystem if it has been
// already deleted by RevokeIsolatedFileSystem.
if (ref_counts_.find(filesystem_id) == ref_counts_.end())
return;
DCHECK(ref_counts_[filesystem_id] > 0);
if (--ref_counts_[filesystem_id] == 0)
RevokeWithoutLocking(filesystem_id);
}
bool IsolatedContext::CrackIsolatedPath(const FilePath& virtual_path,
std::string* filesystem_id,
FilePath* root_path,
FilePath* platform_path) const {
DCHECK(filesystem_id);
DCHECK(platform_path);
// This should not contain any '..' references.
if (virtual_path.ReferencesParent())
return false;
// The virtual_path should comprise <filesystem_id> and <relative_path> parts.
std::vector<FilePath::StringType> components;
virtual_path.GetComponents(&components);
if (components.size() < 1)
return false;
base::AutoLock locker(lock_);
std::string fsid = FilePath(components[0]).MaybeAsASCII();
if (fsid.empty())
return false;
IDToPathMap::const_iterator found_toplevels = toplevel_map_.find(fsid);
if (found_toplevels == toplevel_map_.end())
return false;
*filesystem_id = fsid;
if (components.size() == 1) {
platform_path->clear();
return true;
}
// components[1] should be a toplevel path of the dropped paths.
PathMap::const_iterator found = found_toplevels->second.find(
FilePath(components[1]));
if (found == found_toplevels->second.end())
return false;
FilePath path = found->second;
if (root_path)
*root_path = path;
for (size_t i = 2; i < components.size(); ++i) {
path = path.Append(components[i]);
}
*platform_path = path;
return true;
}
bool IsolatedContext::GetTopLevelPaths(const std::string& filesystem_id,
std::vector<FilePath>* paths) const {
DCHECK(paths);
base::AutoLock locker(lock_);
IDToPathMap::const_iterator found = toplevel_map_.find(filesystem_id);
if (found == toplevel_map_.end())
return false;
paths->clear();
PathMap toplevels = found->second;
for (PathMap::const_iterator iter = toplevels.begin();
iter != toplevels.end(); ++iter) {
// Each path map entry holds a map of a toplevel name to its full path.
paths->push_back(iter->second);
}
return true;
}
bool IsolatedContext::SetWritable(const std::string& filesystem_id,
bool writable) {
base::AutoLock locker(lock_);
if (toplevel_map_.find(filesystem_id) == toplevel_map_.end())
return false;
if (writable)
writable_ids_.insert(filesystem_id);
else
writable_ids_.erase(filesystem_id);
return true;
}
bool IsolatedContext::IsWritable(const std::string& filesystem_id) const {
base::AutoLock locker(lock_);
return (writable_ids_.find(filesystem_id) != writable_ids_.end());
}
FilePath IsolatedContext::CreateVirtualPath(
const std::string& filesystem_id, const FilePath& relative_path) const {
FilePath full_path;
full_path = full_path.AppendASCII(filesystem_id);
if (relative_path.value() != FILE_PATH_LITERAL("/"))
full_path = full_path.Append(relative_path);
return full_path;
}
IsolatedContext::IsolatedContext() {
}
IsolatedContext::~IsolatedContext() {
}
void IsolatedContext::RevokeWithoutLocking(
const std::string& filesystem_id) {
toplevel_map_.erase(filesystem_id);
writable_ids_.erase(filesystem_id);
ref_counts_.erase(filesystem_id);
}
std::string IsolatedContext::GetNewFileSystemId() const {
// Returns an arbitrary random string which must be unique in the map.
uint32 random_data[4];
std::string id;
do {
base::RandBytes(random_data, sizeof(random_data));
id = base::HexEncode(random_data, sizeof(random_data));
} while (toplevel_map_.find(id) != toplevel_map_.end());
return id;
}
} // namespace fileapi
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