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 "net/base/platform_mime_util.h"
6
7#import <Foundation/Foundation.h>
8
9#include <string>
10
11#include "base/mac/foundation_util.h"
12#include "base/mac/scoped_cftyperef.h"
13#include "base/strings/sys_string_conversions.h"
14
15#if defined(OS_IOS)
16#include <MobileCoreServices/MobileCoreServices.h>
17#else
18#include <CoreServices/CoreServices.h>
19#endif  // defined(OS_IOS)
20
21#if !defined(OS_IOS)
22// SPI declaration; see the commentary in GetPlatformExtensionsForMimeType.
23// iOS must not use any private API, per Apple guideline.
24
25@interface NSURLFileTypeMappings : NSObject
26+ (NSURLFileTypeMappings*)sharedMappings;
27- (NSArray*)extensionsForMIMEType:(NSString*)mimeType;
28@end
29#endif  // !defined(OS_IOS)
30
31namespace net {
32
33bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
34    const base::FilePath::StringType& ext, std::string* result) const {
35  std::string ext_nodot = ext;
36  if (ext_nodot.length() >= 1 && ext_nodot[0] == L'.')
37    ext_nodot.erase(ext_nodot.begin());
38  base::ScopedCFTypeRef<CFStringRef> ext_ref(
39      base::SysUTF8ToCFStringRef(ext_nodot));
40  if (!ext_ref)
41    return false;
42  base::ScopedCFTypeRef<CFStringRef> uti(UTTypeCreatePreferredIdentifierForTag(
43      kUTTagClassFilenameExtension, ext_ref, NULL));
44  if (!uti)
45    return false;
46  base::ScopedCFTypeRef<CFStringRef> mime_ref(
47      UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType));
48  if (!mime_ref)
49    return false;
50
51  *result = base::SysCFStringRefToUTF8(mime_ref);
52  return true;
53}
54
55bool PlatformMimeUtil::GetPreferredExtensionForMimeType(
56    const std::string& mime_type, base::FilePath::StringType* ext) const {
57  base::ScopedCFTypeRef<CFStringRef> mime_ref(
58      base::SysUTF8ToCFStringRef(mime_type));
59  if (!mime_ref)
60    return false;
61  base::ScopedCFTypeRef<CFStringRef> uti(UTTypeCreatePreferredIdentifierForTag(
62      kUTTagClassMIMEType, mime_ref, NULL));
63  if (!uti)
64    return false;
65  base::ScopedCFTypeRef<CFStringRef> ext_ref(
66      UTTypeCopyPreferredTagWithClass(uti, kUTTagClassFilenameExtension));
67  if (!ext_ref)
68    return false;
69
70  *ext = base::SysCFStringRefToUTF8(ext_ref);
71  return true;
72}
73
74void PlatformMimeUtil::GetPlatformExtensionsForMimeType(
75    const std::string& mime_type,
76    base::hash_set<base::FilePath::StringType>* extensions) const {
77#if defined(OS_IOS)
78  NSArray* extensions_list = nil;
79#else
80  // There is no API for this that uses UTIs. The WebKitSystemInterface call
81  // WKGetExtensionsForMIMEType() is a thin wrapper around
82  // [[NSURLFileTypeMappings sharedMappings] extensionsForMIMEType:], which is
83  // used by Firefox as well.
84  //
85  // See:
86  // http://mxr.mozilla.org/mozilla-central/search?string=extensionsForMIMEType
87  // http://www.openradar.me/11384153
88  // rdar://11384153
89  NSArray* extensions_list =
90      [[NSURLFileTypeMappings sharedMappings]
91          extensionsForMIMEType:base::SysUTF8ToNSString(mime_type)];
92#endif  // defined(OS_IOS)
93
94  if (extensions_list) {
95    for (NSString* extension in extensions_list)
96      extensions->insert(base::SysNSStringToUTF8(extension));
97  } else {
98    // Huh? Give up.
99    base::FilePath::StringType ext;
100    if (GetPreferredExtensionForMimeType(mime_type, &ext))
101      extensions->insert(ext);
102  }
103}
104
105}  // namespace net
106