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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file provides MIME related utilities.
#ifndef CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_MIME_UTIL_H_
#define CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_MIME_UTIL_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
class Profile;
namespace base {
class FilePath;
} // namespace base
namespace storage {
class FileSystemURL;
} // namespace storage
namespace extensions {
namespace app_file_handler_util {
// Gets a MIME type for a local path and returns it with |callback|. If not
// found, then the MIME type is an empty string.
void GetMimeTypeForLocalPath(
Profile* profile,
const base::FilePath& local_path,
const base::Callback<void(const std::string&)>& callback);
// Collects MIME types for files passed in the input vector. For non-native
// file systems tries to fetch the MIME type from metadata. For native ones,
// tries to sniff or guess by looking at the extension. If MIME type is not
// available, then an empty string is returned in the result vector.
class MimeTypeCollector {
public:
typedef base::Callback<void(scoped_ptr<std::vector<std::string> >)>
CompletionCallback;
explicit MimeTypeCollector(Profile* profile);
virtual ~MimeTypeCollector();
// Collects all mime types asynchronously for a vector of URLs and upon
// completion, calls the |callback|. It can be called only once.
void CollectForURLs(const std::vector<storage::FileSystemURL>& urls,
const CompletionCallback& callback);
// Collects all mime types asynchronously for a vector of local file paths and
// upon completion, calls the |callback|. It can be called only once.
void CollectForLocalPaths(const std::vector<base::FilePath>& local_paths,
const CompletionCallback& callback);
private:
// Called, when the |index|-th input file (or URL) got processed.
void OnMimeTypeCollected(size_t index, const std::string& mime_type);
Profile* profile_;
scoped_ptr<std::vector<std::string> > result_;
size_t left_;
CompletionCallback callback_;
base::WeakPtrFactory<MimeTypeCollector> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(MimeTypeCollector);
};
} // namespace app_file_handler_util
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_MIME_UTIL_H_
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