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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 "content/browser/fileapi/browser_file_system_helper.h"
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/sequenced_task_runner.h"
#include "base/threading/sequenced_worker_pool.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "storage/browser/fileapi/external_mount_points.h"
#include "storage/browser/fileapi/file_permission_policy.h"
#include "storage/browser/fileapi/file_system_backend.h"
#include "storage/browser/fileapi/file_system_context.h"
#include "storage/browser/fileapi/file_system_operation_runner.h"
#include "storage/browser/fileapi/file_system_options.h"
#include "storage/browser/quota/quota_manager.h"
#include "url/url_constants.h"
namespace content {
namespace {
using storage::FileSystemOptions;
FileSystemOptions CreateBrowserFileSystemOptions(bool is_incognito) {
FileSystemOptions::ProfileMode profile_mode =
is_incognito ? FileSystemOptions::PROFILE_MODE_INCOGNITO
: FileSystemOptions::PROFILE_MODE_NORMAL;
std::vector<std::string> additional_allowed_schemes;
GetContentClient()->browser()->GetAdditionalAllowedSchemesForFileSystem(
&additional_allowed_schemes);
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAllowFileAccessFromFiles)) {
additional_allowed_schemes.push_back(url::kFileScheme);
}
return FileSystemOptions(profile_mode, additional_allowed_schemes, NULL);
}
} // namespace
scoped_refptr<storage::FileSystemContext> CreateFileSystemContext(
BrowserContext* browser_context,
const base::FilePath& profile_path,
bool is_incognito,
storage::QuotaManagerProxy* quota_manager_proxy) {
base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
scoped_refptr<base::SequencedTaskRunner> file_task_runner =
pool->GetSequencedTaskRunnerWithShutdownBehavior(
pool->GetNamedSequenceToken("FileAPI"),
base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
// Setting up additional filesystem backends.
ScopedVector<storage::FileSystemBackend> additional_backends;
GetContentClient()->browser()->GetAdditionalFileSystemBackends(
browser_context,
profile_path,
&additional_backends);
// Set up the auto mount handlers for url requests.
std::vector<storage::URLRequestAutoMountHandler>
url_request_auto_mount_handlers;
GetContentClient()->browser()->GetURLRequestAutoMountHandlers(
&url_request_auto_mount_handlers);
scoped_refptr<storage::FileSystemContext> file_system_context =
new storage::FileSystemContext(
BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get(),
file_task_runner.get(),
BrowserContext::GetMountPoints(browser_context),
browser_context->GetSpecialStoragePolicy(),
quota_manager_proxy,
additional_backends.Pass(),
url_request_auto_mount_handlers,
profile_path,
CreateBrowserFileSystemOptions(is_incognito));
std::vector<storage::FileSystemType> types;
file_system_context->GetFileSystemTypes(&types);
for (size_t i = 0; i < types.size(); ++i) {
ChildProcessSecurityPolicyImpl::GetInstance()
->RegisterFileSystemPermissionPolicy(
types[i],
storage::FileSystemContext::GetPermissionPolicy(types[i]));
}
return file_system_context;
}
bool FileSystemURLIsValid(storage::FileSystemContext* context,
const storage::FileSystemURL& url) {
if (!url.is_valid())
return false;
return context->GetFileSystemBackend(url.type()) != NULL;
}
void SyncGetPlatformPath(storage::FileSystemContext* context,
int process_id,
const GURL& path,
base::FilePath* platform_path) {
DCHECK(context->default_file_task_runner()->
RunsTasksOnCurrentThread());
DCHECK(platform_path);
*platform_path = base::FilePath();
storage::FileSystemURL url(context->CrackURL(path));
if (!FileSystemURLIsValid(context, url))
return;
// Make sure if this file is ok to be read (in the current architecture
// which means roughly same as the renderer is allowed to get the platform
// path to the file).
ChildProcessSecurityPolicyImpl* policy =
ChildProcessSecurityPolicyImpl::GetInstance();
if (!policy->CanReadFileSystemFile(process_id, url))
return;
context->operation_runner()->SyncGetPlatformPath(url, platform_path);
// The path is to be attached to URLLoader so we grant read permission
// for the file. (We need to check first because a parent directory may
// already have the permissions and we don't need to grant it to the file.)
if (!policy->CanReadFile(process_id, *platform_path))
policy->GrantReadFile(process_id, *platform_path);
}
} // namespace content
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