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