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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "content/browser/fileapi/browser_file_system_helper.h"
6 
7 #include <string>
8 #include <vector>
9 
10 #include "base/command_line.h"
11 #include "base/files/file_path.h"
12 #include "base/sequenced_task_runner.h"
13 #include "base/threading/sequenced_worker_pool.h"
14 #include "content/browser/child_process_security_policy_impl.h"
15 #include "content/public/browser/browser_context.h"
16 #include "content/public/browser/browser_thread.h"
17 #include "content/public/browser/content_browser_client.h"
18 #include "content/public/common/content_client.h"
19 #include "content/public/common/content_switches.h"
20 #include "storage/browser/fileapi/external_mount_points.h"
21 #include "storage/browser/fileapi/file_permission_policy.h"
22 #include "storage/browser/fileapi/file_system_backend.h"
23 #include "storage/browser/fileapi/file_system_context.h"
24 #include "storage/browser/fileapi/file_system_operation_runner.h"
25 #include "storage/browser/fileapi/file_system_options.h"
26 #include "storage/browser/quota/quota_manager.h"
27 #include "url/url_constants.h"
28 
29 namespace content {
30 
31 namespace {
32 
33 using storage::FileSystemOptions;
34 
CreateBrowserFileSystemOptions(bool is_incognito)35 FileSystemOptions CreateBrowserFileSystemOptions(bool is_incognito) {
36   FileSystemOptions::ProfileMode profile_mode =
37       is_incognito ? FileSystemOptions::PROFILE_MODE_INCOGNITO
38                    : FileSystemOptions::PROFILE_MODE_NORMAL;
39   std::vector<std::string> additional_allowed_schemes;
40   GetContentClient()->browser()->GetAdditionalAllowedSchemesForFileSystem(
41       &additional_allowed_schemes);
42   if (CommandLine::ForCurrentProcess()->HasSwitch(
43           switches::kAllowFileAccessFromFiles)) {
44     additional_allowed_schemes.push_back(url::kFileScheme);
45   }
46   return FileSystemOptions(profile_mode, additional_allowed_schemes, NULL);
47 }
48 
49 }  // namespace
50 
CreateFileSystemContext(BrowserContext * browser_context,const base::FilePath & profile_path,bool is_incognito,storage::QuotaManagerProxy * quota_manager_proxy)51 scoped_refptr<storage::FileSystemContext> CreateFileSystemContext(
52     BrowserContext* browser_context,
53     const base::FilePath& profile_path,
54     bool is_incognito,
55     storage::QuotaManagerProxy* quota_manager_proxy) {
56   base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
57   scoped_refptr<base::SequencedTaskRunner> file_task_runner =
58       pool->GetSequencedTaskRunnerWithShutdownBehavior(
59           pool->GetNamedSequenceToken("FileAPI"),
60           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
61 
62   // Setting up additional filesystem backends.
63   ScopedVector<storage::FileSystemBackend> additional_backends;
64   GetContentClient()->browser()->GetAdditionalFileSystemBackends(
65       browser_context,
66       profile_path,
67       &additional_backends);
68 
69   // Set up the auto mount handlers for url requests.
70   std::vector<storage::URLRequestAutoMountHandler>
71       url_request_auto_mount_handlers;
72   GetContentClient()->browser()->GetURLRequestAutoMountHandlers(
73       &url_request_auto_mount_handlers);
74 
75   scoped_refptr<storage::FileSystemContext> file_system_context =
76       new storage::FileSystemContext(
77           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get(),
78           file_task_runner.get(),
79           BrowserContext::GetMountPoints(browser_context),
80           browser_context->GetSpecialStoragePolicy(),
81           quota_manager_proxy,
82           additional_backends.Pass(),
83           url_request_auto_mount_handlers,
84           profile_path,
85           CreateBrowserFileSystemOptions(is_incognito));
86 
87   std::vector<storage::FileSystemType> types;
88   file_system_context->GetFileSystemTypes(&types);
89   for (size_t i = 0; i < types.size(); ++i) {
90     ChildProcessSecurityPolicyImpl::GetInstance()
91         ->RegisterFileSystemPermissionPolicy(
92             types[i],
93             storage::FileSystemContext::GetPermissionPolicy(types[i]));
94   }
95 
96   return file_system_context;
97 }
98 
FileSystemURLIsValid(storage::FileSystemContext * context,const storage::FileSystemURL & url)99 bool FileSystemURLIsValid(storage::FileSystemContext* context,
100                           const storage::FileSystemURL& url) {
101   if (!url.is_valid())
102     return false;
103 
104   return context->GetFileSystemBackend(url.type()) != NULL;
105 }
106 
SyncGetPlatformPath(storage::FileSystemContext * context,int process_id,const GURL & path,base::FilePath * platform_path)107 void SyncGetPlatformPath(storage::FileSystemContext* context,
108                          int process_id,
109                          const GURL& path,
110                          base::FilePath* platform_path) {
111   DCHECK(context->default_file_task_runner()->
112          RunsTasksOnCurrentThread());
113   DCHECK(platform_path);
114   *platform_path = base::FilePath();
115   storage::FileSystemURL url(context->CrackURL(path));
116   if (!FileSystemURLIsValid(context, url))
117     return;
118 
119   // Make sure if this file is ok to be read (in the current architecture
120   // which means roughly same as the renderer is allowed to get the platform
121   // path to the file).
122   ChildProcessSecurityPolicyImpl* policy =
123       ChildProcessSecurityPolicyImpl::GetInstance();
124   if (!policy->CanReadFileSystemFile(process_id, url))
125     return;
126 
127   context->operation_runner()->SyncGetPlatformPath(url, platform_path);
128 
129   // The path is to be attached to URLLoader so we grant read permission
130   // for the file. (We need to check first because a parent directory may
131   // already have the permissions and we don't need to grant it to the file.)
132   if (!policy->CanReadFile(process_id, *platform_path))
133     policy->GrantReadFile(process_id, *platform_path);
134 }
135 
136 }  // namespace content
137