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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/browser/ash/file_system_provider/mount_path_util.h"
#include <stddef.h>
#include <vector>
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/ash/file_manager/path_util.h"
#include "chrome/browser/ash/file_system_provider/provided_file_system.h"
#include "chrome/browser/ash/file_system_provider/provided_file_system_info.h"
#include "chrome/browser/ash/file_system_provider/service.h"
#include "chrome/browser/ash/profiles/profile_helper.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "components/user_manager/user.h"
#include "components/user_manager/user_manager.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace ash::file_system_provider::util {
namespace {
// Root mount path for all of the provided file systems.
const base::FilePath::CharType kProvidedMountPointRoot[] =
FILE_PATH_LITERAL("/provided");
} // namespace
// Escapes the file system id so it can be used as a file/directory name.
// This is based on net/base/escape.cc: net::(anonymous namespace)::Escape
std::string EscapeFileSystemId(const std::string& file_system_id) {
std::string escaped;
for (char c : file_system_id) {
if (c == '%' || c == '.' || c == '/') {
base::StringAppendF(&escaped, "%%%02X", c);
} else {
escaped.push_back(c);
}
}
return escaped;
}
base::FilePath GetMountPath(Profile* profile,
const ProviderId& provider_id,
const std::string& file_system_id) {
const user_manager::User* const user =
user_manager::UserManager::IsInitialized()
? ProfileHelper::Get()->GetUserByProfile(
profile->GetOriginalProfile())
: nullptr;
const std::string safe_file_system_id = EscapeFileSystemId(file_system_id);
const std::string username_suffix = user ? user->username_hash() : "";
return base::FilePath(kProvidedMountPointRoot)
.AppendASCII(provider_id.ToString() + ":" + safe_file_system_id + ":" +
username_suffix);
}
bool IsFileSystemProviderLocalPath(const base::FilePath& local_path) {
std::vector<base::FilePath::StringType> components =
local_path.GetComponents();
if (components.size() < 3)
return false;
if (components[0] != FILE_PATH_LITERAL("/"))
return false;
if (components[1] != kProvidedMountPointRoot + 1 /* no leading slash */)
return false;
return true;
}
FileSystemURLParser::FileSystemURLParser(const storage::FileSystemURL& url)
: url_(url), file_system_(nullptr) {}
FileSystemURLParser::~FileSystemURLParser() = default;
bool FileSystemURLParser::Parse() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
switch (url_.type()) {
case storage::kFileSystemTypeFuseBox:
case storage::kFileSystemTypeProvided:
break;
default:
return false;
}
std::string filesystem_id = url_.filesystem_id();
base::FilePath path = url_.path();
// Convert fusebox URL to its backing (FSP) file system provider URL.
if (url_.type() == storage::kFileSystemTypeFuseBox) {
const size_t prefix_len =
strlen(file_manager::util::kFuseBoxMountNamePrefix) +
strlen(file_manager::util::kFuseBoxSubdirPrefixFSP);
const std::string& virtual_path = url_.virtual_path().value();
if ((filesystem_id.size() < prefix_len) ||
(virtual_path.size() < prefix_len)) {
return false;
}
filesystem_id = filesystem_id.substr(prefix_len);
path = base::FilePath::FromUTF8Unsafe(base::JoinString(
{kProvidedMountPointRoot, virtual_path.substr(prefix_len)}, "/"));
}
// Find the service that handles the provider URL mount point.
for (Profile* profile :
g_browser_process->profile_manager()->GetLoadedProfiles()) {
Profile* original_profile = profile->GetOriginalProfile();
if (original_profile != profile ||
!ProfileHelper::IsUserProfile(original_profile)) {
continue;
}
Service* const service = Service::Get(original_profile);
if (!service)
continue;
ProvidedFileSystemInterface* const file_system =
service->GetProvidedFileSystem(filesystem_id);
if (!file_system)
continue;
// Strip the mount path name from the local path, to extract the file path
// within the provided file system.
file_system_ = file_system;
std::vector<base::FilePath::StringType> components = path.GetComponents();
if (components.size() < 3)
return false;
file_path_ = base::FilePath(FILE_PATH_LITERAL("/"));
for (size_t i = 3; i < components.size(); ++i) {
file_path_ = file_path_.Append(components[i]);
}
return true;
}
// Nothing has been found.
return false;
}
LocalPathParser::LocalPathParser(Profile* profile,
const base::FilePath& local_path)
: profile_(profile), local_path_(local_path), file_system_(nullptr) {}
LocalPathParser::~LocalPathParser() = default;
bool LocalPathParser::Parse() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!IsFileSystemProviderLocalPath(local_path_))
return false;
std::vector<base::FilePath::StringType> components =
local_path_.GetComponents();
if (components.size() < 3)
return false;
const std::string mount_point_name = components[2];
Service* const service = Service::Get(profile_);
if (!service)
return false;
ProvidedFileSystemInterface* const file_system =
service->GetProvidedFileSystem(mount_point_name);
if (!file_system)
return false;
// Strip the mount point path from the virtual path, to extract the file
// path within the provided file system.
file_system_ = file_system;
file_path_ = base::FilePath(FILE_PATH_LITERAL("/"));
for (size_t i = 3; i < components.size(); ++i) {
file_path_ = file_path_.Append(components[i]);
}
return true;
}
} // namespace ash::file_system_provider::util
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