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// Copyright (c) 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/chromeos/drive/search_metadata.h"
#include <algorithm>
#include "base/bind.h"
#include "base/string_util.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/escape.h"
using content::BrowserThread;
namespace drive {
namespace {
// Used to sort the search result per the last accessed/modified time. The
// recently accessed/modified files come first.
bool CompareByTimestamp(const MetadataSearchResult& a,
const MetadataSearchResult& b) {
const PlatformFileInfoProto& a_file_info = a.entry_proto.file_info();
const PlatformFileInfoProto& b_file_info = b.entry_proto.file_info();
if (a_file_info.last_accessed() != b_file_info.last_accessed())
return a_file_info.last_accessed() > b_file_info.last_accessed();
// When the entries have the same last access time (which happens quite often
// because Drive server doesn't set the field until an entry is viewed via
// drive.google.com), we use last modified time as the tie breaker.
return a_file_info.last_modified() > b_file_info.last_modified();
}
} // namespace
// Helper class for searching the local resource metadata.
class SearchMetadataHelper {
public:
SearchMetadataHelper(DriveFileSystemInterface* file_system,
const std::string& query,
int at_most_num_matches,
const SearchMetadataCallback& callback)
: file_system_(file_system),
query_(query),
at_most_num_matches_(at_most_num_matches),
callback_(callback),
results_(new MetadataSearchResultVector),
num_pending_reads_(0),
ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
}
// Starts searching the local resource metadata by reading the root
// directory.
void Start() {
const FilePath root(kDriveRootDirectory);
++num_pending_reads_;
file_system_->ReadDirectoryByPath(
root,
base::Bind(&SearchMetadataHelper::DidReadDirectoryByPath,
weak_ptr_factory_.GetWeakPtr(),
root));
}
private:
// Called when a directory is read. Continues searching the local resource
// metadata by recursively reading sub directories.
void DidReadDirectoryByPath(const FilePath& parent_path,
DriveFileError error,
bool hide_hosted_documents,
scoped_ptr<DriveEntryProtoVector> entries) {
if (error != DRIVE_FILE_OK) {
callback_.Run(error, scoped_ptr<MetadataSearchResultVector>());
// There could be some in-flight ReadDirectoryByPath() requests, but
// deleting |this| is safe thanks to the weak pointer.
delete this;
return;
}
DCHECK(entries);
--num_pending_reads_;
for (size_t i = 0; i < entries->size(); ++i) {
const DriveEntryProto& entry = entries->at(i);
const FilePath current_path = parent_path.Append(
FilePath::FromUTF8Unsafe(entry.base_name()));
// Skip the hosted document if "hide hosted documents" setting is
// enabled.
if (hide_hosted_documents &&
entry.file_specific_info().is_hosted_document())
continue;
// Add it to the search result if the base name of the file contains
// the query.
std::string highlighted;
if (FindAndHighlight(entry.base_name(), query_, &highlighted)) {
results_->push_back(
MetadataSearchResult(current_path, entry, highlighted));
}
// Recursively reading the sub directory.
if (entry.file_info().is_directory()) {
++num_pending_reads_;
file_system_->ReadDirectoryByPath(
current_path,
base::Bind(&SearchMetadataHelper::DidReadDirectoryByPath,
weak_ptr_factory_.GetWeakPtr(),
current_path));
}
}
if (num_pending_reads_ == 0) {
// Search is complete. Send the result to the callback.
std::sort(results_->begin(), results_->end(), &CompareByTimestamp);
if (results_->size() > static_cast<size_t>(at_most_num_matches_)) {
// Don't use resize() as it requres a default constructor.
results_->erase(results_->begin() + at_most_num_matches_,
results_->end());
}
callback_.Run(DRIVE_FILE_OK, results_.Pass());
delete this;
}
}
DriveFileSystemInterface* file_system_;
const std::string query_;
const int at_most_num_matches_;
const SearchMetadataCallback callback_;
scoped_ptr<MetadataSearchResultVector> results_;
int num_pending_reads_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<SearchMetadataHelper> weak_ptr_factory_;
};
void SearchMetadata(DriveFileSystemInterface* file_system,
const std::string& query,
int at_most_num_matches,
const SearchMetadataCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(!callback.is_null());
// |helper| will delete itself when the search is done.
SearchMetadataHelper* helper =
new SearchMetadataHelper(file_system,
query,
at_most_num_matches,
callback);
helper->Start();
}
bool FindAndHighlight(const std::string& text,
const std::string& query,
std::string* highlighted_text) {
DCHECK(highlighted_text);
highlighted_text->clear();
if (query.empty())
return false;
// TODO(satorux): Should support non-ASCII characters.
std::string lower_text = StringToLowerASCII(text);
std::string lower_query = StringToLowerASCII(query);
int num_matches = 0;
std::string::size_type cursor = 0;
while (cursor < text.size()) {
std::string::size_type matched_position =
lower_text.find(lower_query, cursor);
if (matched_position == std::string::npos)
break;
++num_matches;
std::string skipped_piece =
net::EscapeForHTML(text.substr(cursor, matched_position - cursor));
std::string matched_piece =
net::EscapeForHTML(text.substr(matched_position, query.size()));
highlighted_text->append(skipped_piece);
highlighted_text->append("<b>" + matched_piece + "</b>");
cursor = matched_position + query.size();
}
if (num_matches == 0)
return false;
std::string remaining_piece = text.substr(cursor);
highlighted_text->append(net::EscapeForHTML(remaining_piece));
return true;
}
} // namespace drive
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