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// Copyright (c) 2012 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 "sync/internal_api/syncapi_internal.h"
#include <stddef.h>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "sync/protocol/attachments.pb.h"
#include "sync/protocol/password_specifics.pb.h"
#include "sync/protocol/sync.pb.h"
#include "sync/util/cryptographer.h"
namespace syncer {
namespace {
bool EndsWithSpace(const std::string& string) {
return !string.empty() && *string.rbegin() == ' ';
}
}
sync_pb::PasswordSpecificsData* DecryptPasswordSpecifics(
const sync_pb::EntitySpecifics& specifics, Cryptographer* crypto) {
if (!specifics.has_password())
return NULL;
const sync_pb::PasswordSpecifics& password_specifics = specifics.password();
if (!password_specifics.has_encrypted())
return NULL;
const sync_pb::EncryptedData& encrypted = password_specifics.encrypted();
scoped_ptr<sync_pb::PasswordSpecificsData> data(
new sync_pb::PasswordSpecificsData);
if (!crypto->CanDecrypt(encrypted))
return NULL;
if (!crypto->Decrypt(encrypted, data.get()))
return NULL;
return data.release();
}
// The list of names which are reserved for use by the server.
static const char* kForbiddenServerNames[] = { "", ".", ".." };
// When taking a name from the syncapi, append a space if it matches the
// pattern of a server-illegal name followed by zero or more spaces.
void SyncAPINameToServerName(const std::string& syncer_name,
std::string* out) {
*out = syncer_name;
if (IsNameServerIllegalAfterTrimming(*out))
out->append(" ");
}
// In the reverse direction, if a server name matches the pattern of a
// server-illegal name followed by one or more spaces, remove the trailing
// space.
void ServerNameToSyncAPIName(const std::string& server_name,
std::string* out) {
CHECK(out);
int length_to_copy = server_name.length();
if (IsNameServerIllegalAfterTrimming(server_name) &&
EndsWithSpace(server_name)) {
--length_to_copy;
}
*out = server_name.substr(0, length_to_copy);
}
// Checks whether |name| is a server-illegal name followed by zero or more space
// characters. The three server-illegal names are the empty string, dot, and
// dot-dot. Very long names (>255 bytes in UTF-8 Normalization Form C) are
// also illegal, but are not considered here.
bool IsNameServerIllegalAfterTrimming(const std::string& name) {
size_t untrimmed_count = name.find_last_not_of(' ') + 1;
for (size_t i = 0; i < arraysize(kForbiddenServerNames); ++i) {
if (name.compare(0, untrimmed_count, kForbiddenServerNames[i]) == 0)
return true;
}
return false;
}
// Compare the values of two EntitySpecifics, accounting for encryption.
bool AreSpecificsEqual(const Cryptographer* cryptographer,
const sync_pb::EntitySpecifics& left,
const sync_pb::EntitySpecifics& right) {
// Note that we can't compare encrypted strings directly as they are seeded
// with a random value.
std::string left_plaintext, right_plaintext;
if (left.has_encrypted()) {
if (!cryptographer->CanDecrypt(left.encrypted())) {
NOTREACHED() << "Attempting to compare undecryptable data.";
return false;
}
left_plaintext = cryptographer->DecryptToString(left.encrypted());
} else {
left_plaintext = left.SerializeAsString();
}
if (right.has_encrypted()) {
if (!cryptographer->CanDecrypt(right.encrypted())) {
NOTREACHED() << "Attempting to compare undecryptable data.";
return false;
}
right_plaintext = cryptographer->DecryptToString(right.encrypted());
} else {
right_plaintext = right.SerializeAsString();
}
if (left_plaintext == right_plaintext) {
return true;
}
return false;
}
bool AreAttachmentMetadataEqual(const sync_pb::AttachmentMetadata& left,
const sync_pb::AttachmentMetadata& right) {
if (left.SerializeAsString() == right.SerializeAsString()) {
return true;
}
return false;
}
} // namespace syncer
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