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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