TokenProvider.h

/*
 * Copyright (C) 2019-2023 HERE Europe B.V.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * License-Filename: LICENSE
 */
 
#pragma once
 
#include <chrono>
#include <memory>
#include <string>
#include <utility>
 
#include <olp/authentication/AuthenticationCredentials.h>
#include <olp/authentication/ErrorResponse.h>
#include <olp/authentication/Settings.h>
#include <olp/authentication/Types.h>
#include <olp/core/client/CancellationContext.h>
#include <olp/core/client/OauthToken.h>
#include <olp/core/http/HttpStatusCode.h>
 
namespace olp {
namespace authentication {
 
static constexpr auto kDefaultMinimumValidity = 300ll;
static constexpr auto kDefaultMinimumValiditySeconds =
    std::chrono::seconds(kDefaultMinimumValidity);
static constexpr auto kForceRefresh = std::chrono::seconds(0);
 
namespace internal {
 
class TokenProviderPrivate;
 
class AUTHENTICATION_API TokenProviderImpl {
 public:
  TokenProviderImpl(Settings settings, std::chrono::seconds minimum_validity);
 
  client::OauthTokenResponse operator()(
      client::CancellationContext& context) const;
 
  ErrorResponse GetErrorResponse() const;
 
  int GetHttpStatusCode() const;
 
  TokenResponse GetResponse(client::CancellationContext& context) const;
 
  bool IsTokenResponseOK() const;
 
 private:
  std::shared_ptr<TokenProviderPrivate> impl_;
};
}  // namespace internal
 
template <uint64_t MinimumValidity>
class TokenProvider {
 public:
  explicit TokenProvider(Settings settings)
      : impl_(std::make_shared<internal::TokenProviderImpl>(
            std::move(settings), std::chrono::seconds(MinimumValidity))) {}
 
  TokenProvider(const TokenProvider& other) = default;
 
  TokenProvider(TokenProvider&& other) noexcept = default;
 
  TokenProvider& operator=(const TokenProvider& other) = default;
 
  TokenProvider& operator=(TokenProvider&& other) noexcept = default;
 
  operator bool() const { return impl_->IsTokenResponseOK(); }
 
  client::OauthTokenResponse operator()(
      client::CancellationContext& context) const {
    return impl_->operator()(context);
  }
 
  ErrorResponse GetErrorResponse() const { return impl_->GetErrorResponse(); }
 
  int GetHttpStatusCode() const { return impl_->GetHttpStatusCode(); }
 
 private:
  std::shared_ptr<internal::TokenProviderImpl> impl_;
};
 
using TokenProviderDefault = TokenProvider<kDefaultMinimumValidity>;
 
}  // namespace authentication
}  // namespace olp