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// Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
//
// 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
//
// http://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.
#ifndef INCLUDED_SRC_BUILDTOOL_COMMON_BAZEL_DIGEST_FACTORY_HPP
#define INCLUDED_SRC_BUILDTOOL_COMMON_BAZEL_DIGEST_FACTORY_HPP
#include <cstddef>
#include <cstdint>
#include <string>
#include "gsl/gsl"
#include "src/buildtool/common/bazel_types.hpp"
#include "src/buildtool/crypto/hash_function.hpp"
#include "src/buildtool/crypto/hash_info.hpp"
#include "src/buildtool/file_system/object_type.hpp"
#include "src/utils/cpp/expected.hpp"
class BazelDigestFactory final {
static constexpr auto kBlobTag = "62";
static constexpr auto kTreeTag = "74";
static constexpr std::size_t kTagLength = 2;
public:
/// \brief Create bazel_re::Digest from preliminarily validated data.
/// \param hash_data Validated hash
/// \param size Size of the content
[[nodiscard]] static auto Create(HashInfo const& hash_info,
std::int64_t size) noexcept
-> bazel_re::Digest;
/// \brief Validate bazel_re::Digest
/// \param hash_type Type of the hash function that was used for creation
/// of the hash
/// \param digest Digest to be validated
/// \return Validated hash on success or an error message on failure.
[[nodiscard]] static auto ToHashInfo(
HashFunction::Type hash_type,
bazel_re::Digest const& digest) noexcept
-> expected<HashInfo, std::string>;
/// \brief Hash content using hash function and return a valid
/// bazel_re::Digest
/// \tparam kType Type of the hashing algorithm to be used
/// \param hash_function Hash function to be used for hashing
/// \param content Content to be hashed
/// \return The digest of the content
template <ObjectType kType>
[[nodiscard]] static auto HashDataAs(HashFunction hash_function,
std::string const& content)
-> bazel_re::Digest {
auto const hash_info =
HashInfo::HashData(hash_function, content, IsTreeObject(kType));
return Create(hash_info, gsl::narrow<std::int64_t>(content.size()));
}
private:
[[nodiscard]] static auto Prefix(std::string const& hash,
bool is_tree) noexcept -> std::string {
return (is_tree ? kTreeTag : kBlobTag) + hash;
}
[[nodiscard]] static auto Unprefix(std::string const& hash) noexcept
-> std::string {
return hash.substr(kTagLength);
}
[[nodiscard]] static auto IsPrefixed(HashFunction::Type hash_type,
std::string const& hash) noexcept
-> bool;
};
#endif // INCLUDED_SRC_BUILDTOOL_COMMON_BAZEL_DIGEST_FACTORY_HPP
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