1 // Copyright 2014 The Chromium Authors
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 "net/base/filename_util.h"
6
7 #include <string>
8
9 #include "base/check.h"
10 #include "base/files/file_path.h"
11 #include "base/i18n/file_util_icu.h"
12 #include "build/chromeos_buildflags.h"
13 #include "net/base/filename_util_internal.h"
14
15 class GURL;
16
17 namespace net {
18
IsSafePortablePathComponent(const base::FilePath & component)19 bool IsSafePortablePathComponent(const base::FilePath& component) {
20 std::u16string component16;
21 base::FilePath::StringType sanitized = component.value();
22 SanitizeGeneratedFileName(&sanitized, true);
23 base::FilePath::StringType extension = component.Extension();
24 if (!extension.empty())
25 extension.erase(extension.begin()); // Erase preceding '.'.
26 return !component.empty() && (component == component.BaseName()) &&
27 (component == component.StripTrailingSeparators()) &&
28 FilePathToString16(component, &component16) &&
29 base::i18n::IsFilenameLegal(component16) &&
30 !IsShellIntegratedExtension(extension) &&
31 (sanitized == component.value()) &&
32 !IsReservedNameOnWindows(component.value());
33 }
34
IsSafePortableRelativePath(const base::FilePath & path)35 bool IsSafePortableRelativePath(const base::FilePath& path) {
36 if (path.empty() || path.IsAbsolute() || path.EndsWithSeparator())
37 return false;
38 std::vector<base::FilePath::StringType> components = path.GetComponents();
39 if (components.empty())
40 return false;
41 for (size_t i = 0; i < components.size() - 1; ++i) {
42 if (!IsSafePortablePathComponent(base::FilePath(components[i])))
43 return false;
44 }
45 return IsSafePortablePathComponent(path.BaseName());
46 }
47
GetSuggestedFilename(const GURL & url,const std::string & content_disposition,const std::string & referrer_charset,const std::string & suggested_name,const std::string & mime_type,const std::string & default_name)48 std::u16string GetSuggestedFilename(const GURL& url,
49 const std::string& content_disposition,
50 const std::string& referrer_charset,
51 const std::string& suggested_name,
52 const std::string& mime_type,
53 const std::string& default_name) {
54 return GetSuggestedFilenameImpl(url, content_disposition, referrer_charset,
55 suggested_name, mime_type, default_name,
56 false, /* should_replace_extension */
57 &base::i18n::ReplaceIllegalCharactersInPath);
58 }
59
GenerateFileName(const GURL & url,const std::string & content_disposition,const std::string & referrer_charset,const std::string & suggested_name,const std::string & mime_type,const std::string & default_file_name)60 base::FilePath GenerateFileName(const GURL& url,
61 const std::string& content_disposition,
62 const std::string& referrer_charset,
63 const std::string& suggested_name,
64 const std::string& mime_type,
65 const std::string& default_file_name) {
66 return GenerateFileName(url, content_disposition, referrer_charset,
67 suggested_name, mime_type, default_file_name,
68 false /* should_replace_extension */);
69 }
70
GenerateFileName(const GURL & url,const std::string & content_disposition,const std::string & referrer_charset,const std::string & suggested_name,const std::string & mime_type,const std::string & default_file_name,bool should_replace_extension)71 base::FilePath GenerateFileName(const GURL& url,
72 const std::string& content_disposition,
73 const std::string& referrer_charset,
74 const std::string& suggested_name,
75 const std::string& mime_type,
76 const std::string& default_file_name,
77 bool should_replace_extension) {
78 base::FilePath generated_name(GenerateFileNameImpl(
79 url, content_disposition, referrer_charset, suggested_name, mime_type,
80 default_file_name, should_replace_extension,
81 &base::i18n::ReplaceIllegalCharactersInPath));
82
83 #if BUILDFLAG(IS_CHROMEOS_ASH)
84 // When doing file manager operations on ChromeOS, the file paths get
85 // normalized in WebKit layer, so let's ensure downloaded files have
86 // normalized names. Otherwise, we won't be able to handle files with NFD
87 // utf8 encoded characters in name.
88 base::i18n::NormalizeFileNameEncoding(&generated_name);
89 #endif
90
91 DCHECK(!generated_name.empty());
92
93 return generated_name;
94 }
95
96 } // namespace net
97