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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/drive/drive_api_util.h"
#include <string>
#include "base/files/file.h"
#include "base/hash/md5.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/atomic_flag.h"
#include "third_party/re2/src/re2/re2.h"
namespace drive {
namespace util {
namespace {
struct HostedDocumentKind {
const char* mime_type;
const char* extension;
};
const HostedDocumentKind kHostedDocumentKinds[] = {
{kGoogleDocumentMimeType, ".gdoc"},
{kGoogleSpreadsheetMimeType, ".gsheet"},
{kGooglePresentationMimeType, ".gslides"},
{kGoogleDrawingMimeType, ".gdraw"},
{kGoogleTableMimeType, ".gtable"},
{kGoogleFormMimeType, ".gform"},
{kGoogleMapMimeType, ".gmaps"},
{kGoogleSiteMimeType, ".gsite"},
};
const char kUnknownHostedDocumentExtension[] = ".glink";
const int kMd5DigestBufferSize = 512 * 1024; // 512 kB.
} // namespace
std::string EscapeQueryStringValue(const std::string& str) {
std::string result;
result.reserve(str.size());
for (size_t i = 0; i < str.size(); ++i) {
if (str[i] == '\\' || str[i] == '\'') {
result.push_back('\\');
}
result.push_back(str[i]);
}
return result;
}
std::string TranslateQuery(const std::string& original_query) {
// In order to handle non-ascii white spaces correctly, convert to UTF16.
std::u16string query = base::UTF8ToUTF16(original_query);
const std::u16string kDelimiter =
base::StrCat({base::kWhitespaceUTF16, u"\""});
std::string result;
for (size_t index = query.find_first_not_of(base::kWhitespaceUTF16);
index != std::u16string::npos;
index = query.find_first_not_of(base::kWhitespaceUTF16, index)) {
bool is_exclusion = (query[index] == '-');
if (is_exclusion)
++index;
if (index == query.length()) {
// Here, the token is '-' and it should be ignored.
continue;
}
size_t begin_token = index;
std::u16string token;
if (query[begin_token] == '"') {
// Quoted query.
++begin_token;
size_t end_token = query.find('"', begin_token);
if (end_token == std::u16string::npos) {
// This is kind of syntax error, since quoted string isn't finished.
// However, the query is built by user manually, so here we treat
// whole remaining string as a token as a fallback, by appending
// a missing double-quote character.
end_token = query.length();
query.push_back('"');
}
token = query.substr(begin_token, end_token - begin_token);
index = end_token + 1; // Consume last '"', too.
} else {
size_t end_token = query.find_first_of(kDelimiter, begin_token);
if (end_token == std::u16string::npos) {
end_token = query.length();
}
token = query.substr(begin_token, end_token - begin_token);
index = end_token;
}
if (token.empty()) {
// Just ignore an empty token.
continue;
}
if (!result.empty()) {
// If there are two or more tokens, need to connect with "and".
result.append(" and ");
}
// The meaning of "fullText" should include title, description and content.
base::StringAppendF(
&result,
"%sfullText contains \'%s\'",
is_exclusion ? "not " : "",
EscapeQueryStringValue(base::UTF16ToUTF8(token)).c_str());
}
return result;
}
std::string CanonicalizeResourceId(const std::string& resource_id) {
// If resource ID is in the old WAPI format starting with a prefix like
// "document:", strip it and return the remaining part.
std::string stripped_resource_id;
if (RE2::FullMatch(resource_id, "^[a-z-]+(?::|%3A)([\\w-]+)$",
&stripped_resource_id))
return stripped_resource_id;
return resource_id;
}
std::string GetMd5Digest(const base::FilePath& file_path,
const base::AtomicFlag* cancellation_flag) {
base::File file(file_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file.IsValid())
return std::string();
base::MD5Context context;
base::MD5Init(&context);
int64_t offset = 0;
std::unique_ptr<char[]> buffer(new char[kMd5DigestBufferSize]);
while (true) {
if (cancellation_flag && cancellation_flag->IsSet()) { // Cancelled.
return std::string();
}
int result = file.Read(offset, buffer.get(), kMd5DigestBufferSize);
if (result < 0) {
// Found an error.
return std::string();
}
if (result == 0) {
// End of file.
break;
}
offset += result;
base::MD5Update(&context, base::StringPiece(buffer.get(), result));
}
base::MD5Digest digest;
base::MD5Final(&digest, &context);
return base::MD5DigestToBase16(digest);
}
bool IsKnownHostedDocumentMimeType(const std::string& mime_type) {
for (size_t i = 0; i < std::size(kHostedDocumentKinds); ++i) {
if (mime_type == kHostedDocumentKinds[i].mime_type)
return true;
}
return false;
}
bool HasHostedDocumentExtension(const base::FilePath& path) {
const std::string extension = base::FilePath(path.Extension()).AsUTF8Unsafe();
for (size_t i = 0; i < std::size(kHostedDocumentKinds); ++i) {
if (extension == kHostedDocumentKinds[i].extension)
return true;
}
return extension == kUnknownHostedDocumentExtension;
}
bool IsEncryptedMimeType(const std::string& mime_type) {
return base::StartsWith(mime_type, kEncryptedMimeType);
}
} // namespace util
} // namespace drive
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