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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.
#include "chrome/browser/extensions/api/file_handlers/mime_util.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/filename_util.h"
#include "net/base/mime_sniffer.h"
#include "net/base/mime_util.h"
#include "storage/browser/fileapi/file_system_url.h"
#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/file_manager/filesystem_api_util.h"
#endif
using content::BrowserThread;
namespace extensions {
namespace app_file_handler_util {
namespace {
// Detects MIME type by reading initial bytes from the file. If found, then
// writes the MIME type to |result|.
void SniffMimeType(const base::FilePath& local_path, std::string* result) {
std::vector<char> content(net::kMaxBytesToSniff);
const int bytes_read =
base::ReadFile(local_path, &content[0], content.size());
if (bytes_read >= 0) {
net::SniffMimeType(&content[0],
bytes_read,
net::FilePathToFileURL(local_path),
std::string(), // type_hint (passes no hint)
result);
}
}
#if defined(OS_CHROMEOS)
// Converts a result passed as a scoped pointer to a dereferenced value passed
// to |callback|.
void OnGetMimeTypeFromFileForNonNativeLocalPathCompleted(
scoped_ptr<std::string> mime_type,
const base::Callback<void(const std::string&)>& callback) {
callback.Run(*mime_type);
}
// Called when fetching MIME type for a non-native local path is completed.
// If |success| is false, then tries to guess the MIME type by looking at the
// file name.
void OnGetMimeTypeFromMetadataForNonNativeLocalPathCompleted(
const base::FilePath& local_path,
const base::Callback<void(const std::string&)>& callback,
bool success,
const std::string& mime_type) {
if (success) {
callback.Run(mime_type);
return;
}
// MIME type not available with metadata, hence try to guess it from the
// file's extension.
scoped_ptr<std::string> mime_type_from_extension(new std::string);
std::string* const mime_type_from_extension_ptr =
mime_type_from_extension.get();
BrowserThread::PostBlockingPoolTaskAndReply(
FROM_HERE,
base::Bind(base::IgnoreResult(&net::GetMimeTypeFromFile),
local_path,
mime_type_from_extension_ptr),
base::Bind(&OnGetMimeTypeFromFileForNonNativeLocalPathCompleted,
base::Passed(&mime_type_from_extension),
callback));
}
#endif
// Called when sniffing for MIME type in the native local file is completed.
void OnSniffMimeTypeForNativeLocalPathCompleted(
scoped_ptr<std::string> mime_type,
const base::Callback<void(const std::string&)>& callback) {
callback.Run(*mime_type);
}
} // namespace
// Handles response of net::GetMimeTypeFromFile for native file systems. If
// MIME type is available, then forwards it to |callback|. Otherwise, fallbacks
// to sniffing.
void OnGetMimeTypeFromFileForNativeLocalPathCompleted(
const base::FilePath& local_path,
scoped_ptr<std::string> mime_type,
const base::Callback<void(const std::string&)>& callback) {
if (!mime_type->empty()) {
callback.Run(*mime_type);
return;
}
scoped_ptr<std::string> sniffed_mime_type(new std::string);
std::string* const sniffed_mime_type_ptr = sniffed_mime_type.get();
BrowserThread::PostBlockingPoolTaskAndReply(
FROM_HERE,
base::Bind(&SniffMimeType, local_path, sniffed_mime_type_ptr),
base::Bind(&OnSniffMimeTypeForNativeLocalPathCompleted,
base::Passed(&sniffed_mime_type),
callback));
}
// Fetches MIME type for a local path and returns it with a |callback|.
void GetMimeTypeForLocalPath(
Profile* profile,
const base::FilePath& local_path,
const base::Callback<void(const std::string&)>& callback) {
#if defined(OS_CHROMEOS)
if (file_manager::util::IsUnderNonNativeLocalPath(profile, local_path)) {
// For non-native files, try to get the MIME type from metadata. If not
// available, then try to guess from the extension. Never sniff (because
// it can be very slow).
file_manager::util::GetNonNativeLocalPathMimeType(
profile,
local_path,
base::Bind(&OnGetMimeTypeFromMetadataForNonNativeLocalPathCompleted,
local_path,
callback));
return;
}
#endif
// For native local files, try to guess the mime from the extension. If
// not available, then try to sniff if.
scoped_ptr<std::string> mime_type_from_extension(new std::string);
std::string* const mime_type_from_extension_ptr =
mime_type_from_extension.get();
BrowserThread::PostBlockingPoolTaskAndReply(
FROM_HERE,
base::Bind(base::IgnoreResult(&net::GetMimeTypeFromFile),
local_path,
mime_type_from_extension_ptr),
base::Bind(&OnGetMimeTypeFromFileForNativeLocalPathCompleted,
local_path,
base::Passed(&mime_type_from_extension),
callback));
}
MimeTypeCollector::MimeTypeCollector(Profile* profile)
: profile_(profile), left_(0), weak_ptr_factory_(this) {
}
MimeTypeCollector::~MimeTypeCollector() {
}
void MimeTypeCollector::CollectForURLs(
const std::vector<storage::FileSystemURL>& urls,
const CompletionCallback& callback) {
std::vector<base::FilePath> local_paths;
for (size_t i = 0; i < urls.size(); ++i) {
local_paths.push_back(urls[i].path());
}
CollectForLocalPaths(local_paths, callback);
}
void MimeTypeCollector::CollectForLocalPaths(
const std::vector<base::FilePath>& local_paths,
const CompletionCallback& callback) {
DCHECK(!callback.is_null());
callback_ = callback;
DCHECK(!result_.get());
result_.reset(new std::vector<std::string>(local_paths.size()));
left_ = local_paths.size();
if (!left_) {
// Nothing to process.
base::MessageLoopProxy::current()->PostTask(
FROM_HERE, base::Bind(callback_, base::Passed(&result_)));
callback_ = CompletionCallback();
return;
}
for (size_t i = 0; i < local_paths.size(); ++i) {
GetMimeTypeForLocalPath(profile_,
local_paths[i],
base::Bind(&MimeTypeCollector::OnMimeTypeCollected,
weak_ptr_factory_.GetWeakPtr(),
i));
}
}
void MimeTypeCollector::OnMimeTypeCollected(size_t index,
const std::string& mime_type) {
(*result_)[index] = mime_type;
if (!--left_) {
base::MessageLoopProxy::current()->PostTask(
FROM_HERE, base::Bind(callback_, base::Passed(&result_)));
// Release the callback to avoid a circullar reference in case an instance
// of this class is a member of a ref counted class, which instance is bound
// to this callback.
callback_ = CompletionCallback();
}
}
} // namespace app_file_handler_util
} // namespace extensions
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