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1 // Copyright 2013 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 // This file provides MIME related utilities.
6 
7 #ifndef CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_MIME_UTIL_H_
8 #define CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_MIME_UTIL_H_
9 
10 #include <string>
11 #include <vector>
12 
13 #include "base/callback.h"
14 #include "base/memory/scoped_ptr.h"
15 #include "base/memory/weak_ptr.h"
16 
17 class Profile;
18 
19 namespace base {
20 class FilePath;
21 }  // namespace base
22 
23 namespace storage {
24 class FileSystemURL;
25 }  // namespace storage
26 
27 namespace extensions {
28 namespace app_file_handler_util {
29 
30 // Gets a MIME type for a local path and returns it with |callback|. If not
31 // found, then the MIME type is an empty string.
32 void GetMimeTypeForLocalPath(
33     Profile* profile,
34     const base::FilePath& local_path,
35     const base::Callback<void(const std::string&)>& callback);
36 
37 // Collects MIME types for files passed in the input vector. For non-native
38 // file systems tries to fetch the MIME type from metadata. For native ones,
39 // tries to sniff or guess by looking at the extension. If MIME type is not
40 // available, then an empty string is returned in the result vector.
41 class MimeTypeCollector {
42  public:
43   typedef base::Callback<void(scoped_ptr<std::vector<std::string> >)>
44       CompletionCallback;
45 
46   explicit MimeTypeCollector(Profile* profile);
47   virtual ~MimeTypeCollector();
48 
49   // Collects all mime types asynchronously for a vector of URLs and upon
50   // completion, calls the |callback|. It can be called only once.
51   void CollectForURLs(const std::vector<storage::FileSystemURL>& urls,
52                       const CompletionCallback& callback);
53 
54   // Collects all mime types asynchronously for a vector of local file paths and
55   // upon completion, calls the |callback|. It can be called only once.
56   void CollectForLocalPaths(const std::vector<base::FilePath>& local_paths,
57                             const CompletionCallback& callback);
58 
59  private:
60   // Called, when the |index|-th input file (or URL) got processed.
61   void OnMimeTypeCollected(size_t index, const std::string& mime_type);
62 
63   Profile* profile_;
64   scoped_ptr<std::vector<std::string> > result_;
65   size_t left_;
66   CompletionCallback callback_;
67   base::WeakPtrFactory<MimeTypeCollector> weak_ptr_factory_;
68 
69   DISALLOW_COPY_AND_ASSIGN(MimeTypeCollector);
70 };
71 
72 }  // namespace app_file_handler_util
73 }  // namespace extensions
74 
75 #endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_MIME_UTIL_H_
76