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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "presence/implementation/advertisement_decoder.h"
#include <string>
#include <vector>
#include "gmock/gmock.h"
#include "protobuf-matchers/protocol-buffer-matchers.h"
#include "gtest/gtest.h"
#include "absl/strings/escaping.h"
#include "presence/data_element.h"
#include "presence/implementation/credential_manager_impl.h"
namespace nearby {
namespace presence {
namespace {
using ::testing::ElementsAre;
using ::testing::Return;
using ::testing::UnorderedElementsAre;
using ::testing::status::StatusIs;
class MockCredentialManager : public CredentialManagerImpl {
public:
MOCK_METHOD(absl::StatusOr<std::string>, DecryptDataElements,
(absl::string_view metadata_key, absl::string_view salt,
absl::string_view data_elements),
(override));
};
TEST(AdvertisementDecoder, DecodeBaseNpPrivateAdvertisement) {
const std::string salt = "AB";
const std::string metadata =
absl::HexStringToBytes("1011121314151617181920212223");
MockCredentialManager credential_manager;
EXPECT_CALL(
credential_manager,
DecryptDataElements(metadata, salt, absl::HexStringToBytes("5051525354")))
.WillOnce(Return(absl::HexStringToBytes("18CD29EEFF")));
AdvertisementDecoder decoder(&credential_manager);
const absl::StatusOr<std::vector<DataElement>> result =
decoder.DecodeAdvertisement(absl::HexStringToBytes(
"00204142e110111213141516171819202122235051525354"));
ASSERT_OK(result);
EXPECT_THAT(
*result,
ElementsAre(DataElement(DataElement::kSaltFieldType, salt),
DataElement(DataElement::kPrivateIdentityFieldType, metadata),
DataElement(8, absl::HexStringToBytes("CD")),
DataElement(9, absl::HexStringToBytes("EEFF"))));
}
TEST(AdvertisementDecoder, DecodeBaseNpPublicAdvertisement) {
const std::string salt = "AB";
MockCredentialManager credential_manager;
AdvertisementDecoder decoder(&credential_manager);
const absl::StatusOr<std::vector<DataElement>> result =
decoder.DecodeAdvertisement(
absl::HexStringToBytes("002041420318CD29EEFF"));
ASSERT_OK(result);
EXPECT_THAT(
*result,
ElementsAre(DataElement(DataElement::kSaltFieldType, salt),
DataElement(DataElement::kPublicIdentityFieldType, ""),
DataElement(8, absl::HexStringToBytes("CD")),
DataElement(9, absl::HexStringToBytes("EEFF"))));
}
TEST(AdvertisementDecoder, DecodeBaseNpPWithActionField) {
std::string salt = "AB";
MockCredentialManager credential_manager;
AdvertisementDecoder decoder(&credential_manager);
auto result =
decoder.DecodeAdvertisement(absl::HexStringToBytes("002041420326B840"));
EXPECT_OK(result);
EXPECT_THAT(*result,
UnorderedElementsAre(
DataElement(DataElement::kSaltFieldType, salt),
DataElement(DataElement::kPublicIdentityFieldType, ""),
DataElement(DataElement::kContextTimestampFieldType,
absl::HexStringToBytes("0B")),
DataElement(DataElement::kActionFieldType,
action::kTapToTransferAction),
DataElement(DataElement::kActionFieldType,
action::kNearbyShareAction)));
}
TEST(AdvertisementDecoder, InvalidAdvertisementFieldTooShort) {
MockCredentialManager credential_manager;
AdvertisementDecoder decoder(&credential_manager);
// 0x50 header means 5 bytes long salt but only 4 bytes follow.
EXPECT_THAT(
decoder.DecodeAdvertisement(absl::HexStringToBytes("0050A0A1A2A3")),
StatusIs(absl::StatusCode::kOutOfRange));
}
TEST(AdvertisementDecoder, ZeroLengthPayload) {
MockCredentialManager credential_manager;
AdvertisementDecoder decoder(&credential_manager);
// A action with type 0xA and no payload
const absl::StatusOr<std::vector<DataElement>> result =
decoder.DecodeAdvertisement(absl::HexStringToBytes("000A"));
ASSERT_OK(result);
EXPECT_THAT(*result, ElementsAre(DataElement(0xA, "")));
}
TEST(AdvertisementDecoder, EmptyAdvertisement) {
MockCredentialManager credential_manager;
AdvertisementDecoder decoder(&credential_manager);
EXPECT_THAT(decoder.DecodeAdvertisement(""),
StatusIs(absl::StatusCode::kOutOfRange));
}
TEST(AdvertisementDecoder, InvalidEncryptedContent) {
const std::string salt = "AB";
const std::string metadata =
absl::HexStringToBytes("1011121314151617181920212223");
MockCredentialManager credential_manager;
// 0x28CD is an invalid DE, 0x28 means a 2 byte payload with type 8 alas only
// one byte is given (0xCD)
EXPECT_CALL(
credential_manager,
DecryptDataElements(metadata, salt, absl::HexStringToBytes("5051525354")))
.WillOnce(Return(absl::HexStringToBytes("28CD")));
AdvertisementDecoder decoder(&credential_manager);
EXPECT_THAT(decoder.DecodeAdvertisement(absl::HexStringToBytes(
"00204142e110111213141516171819202122235051525354")),
StatusIs(absl::StatusCode::kOutOfRange));
}
TEST(AdvertisementDecoder, UnsupportedAdvertisementVersion) {
MockCredentialManager credential_manager;
AdvertisementDecoder decoder(&credential_manager);
EXPECT_THAT(decoder.DecodeAdvertisement(
absl::HexStringToBytes("012041420318CD29EEFF")),
StatusIs(absl::StatusCode::kUnimplemented));
}
} // namespace
} // namespace presence
} // namespace nearby
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