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// Copyright 2013 The Chromium Authors
// 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 EXTENSIONS_BROWSER_API_FILE_HANDLERS_MIME_UTIL_H_
#define EXTENSIONS_BROWSER_API_FILE_HANDLERS_MIME_UTIL_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
namespace content {
class BrowserContext;
}
namespace base {
class FilePath;
} // namespace base
namespace storage {
class FileSystemURL;
} // namespace storage
namespace extensions {
namespace app_file_handler_util {
extern const char kMimeTypeApplicationOctetStream[];
extern const char kMimeTypeInodeDirectory[];
// 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(
content::BrowserContext* context,
const base::FilePath& local_path,
base::OnceCallback<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:
using CompletionCallback =
base::OnceCallback<void(std::unique_ptr<std::vector<std::string>>)>;
explicit MimeTypeCollector(content::BrowserContext* context);
MimeTypeCollector(const MimeTypeCollector&) = delete;
MimeTypeCollector& operator=(const MimeTypeCollector&) = delete;
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,
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,
CompletionCallback callback);
private:
// Called, when the |index|-th input file (or URL) got processed.
void OnMimeTypeCollected(size_t index, const std::string& mime_type);
// This dangling raw_ptr occurred in:
// browser_tests: TabIndex/FilesAppBrowserTest.Test/tabindexFocus
// https://ci.chromium.org/ui/p/chromium/builders/try/linux-chromeos-rel/1539288/test-results?q=ExactID%3Aninja%3A%2F%2Fchrome%2Ftest%3Abrowser_tests%2FFilesAppBrowserTest.Test%2FTabIndex.tabindexFocus+VHash%3A282db19e8ac0a6be
raw_ptr<content::BrowserContext, FlakyDanglingUntriaged> context_;
std::unique_ptr<std::vector<std::string>> result_;
size_t left_;
CompletionCallback callback_;
base::WeakPtrFactory<MimeTypeCollector> weak_ptr_factory_{this};
};
} // namespace app_file_handler_util
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_FILE_HANDLERS_MIME_UTIL_H_
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