text: /*
   *
   * Copyright 2016 gRPC authors.
   *
   * 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.
   *
   */
  
  #include <grpc/support/port_platform.h>
  
  #include "src/core/lib/security/credentials/iam/iam_credentials.h"
  
  #include <stdlib.h>
  
  #include <utility>
  
  #include "absl/strings/str_format.h"
  #include "absl/strings/string_view.h"
  
  #include <grpc/support/log.h>
  
  #include "src/core/lib/debug/trace.h"
  #include "src/core/lib/gprpp/ref_counted_ptr.h"
  #include "src/core/lib/iomgr/exec_ctx.h"
  #include "src/core/lib/promise/poll.h"
  #include "src/core/lib/promise/promise.h"
  #include "src/core/lib/surface/api_trace.h"
  #include "src/core/lib/transport/metadata_batch.h"
  
  grpc_core::ArenaPromise<absl::StatusOr<grpc_core::ClientMetadataHandle>>
  grpc_google_iam_credentials::GetRequestMetadata(
      grpc_core::ClientMetadataHandle initial_metadata,
      const grpc_call_credentials::GetRequestMetadataArgs*) {
    if (token_.has_value()) {
      initial_metadata->Append(
          GRPC_IAM_AUTHORIZATION_TOKEN_METADATA_KEY, token_->Ref(),
          [](absl::string_view, const grpc_core::Slice&) { abort(); });
    }
    initial_metadata->Append(
        GRPC_IAM_AUTHORITY_SELECTOR_METADATA_KEY, authority_selector_.Ref(),
        [](absl::string_view, const grpc_core::Slice&) { abort(); });
    return grpc_core::Immediate(std::move(initial_metadata));
  }
  
  grpc_google_iam_credentials::grpc_google_iam_credentials(
      const char* token, const char* authority_selector)
      : token_(token == nullptr ? absl::optional<grpc_core::Slice>()
                                : grpc_core::Slice::FromCopiedString(token)),
        authority_selector_(
            grpc_core::Slice::FromCopiedString(authority_selector)),
        debug_string_(absl::StrFormat(
            "GoogleIAMCredentials{Token:%s,AuthoritySelector:%s}",
            token != nullptr ? "present" : "absent", authority_selector)) {}
  
  grpc_core::UniqueTypeName grpc_google_iam_credentials::Type() {
    static grpc_core::UniqueTypeName::Factory kFactory("Iam");
    return kFactory.Create();
  }
  
  grpc_call_credentials* grpc_google_iam_credentials_create(
      const char* token, const char* authority_selector, void* reserved) {
    grpc_core::ExecCtx exec_ctx;
    GRPC_API_TRACE(
        "grpc_iam_credentials_create(token=%s, authority_selector=%s, "
        "reserved=%p)",
        3, (token, authority_selector, reserved));
    GPR_ASSERT(reserved == nullptr);
    GPR_ASSERT(token != nullptr);
    GPR_ASSERT(authority_selector != nullptr);
    return grpc_core::MakeRefCounted<grpc_google_iam_credentials>(
               token, authority_selector)
        .release();
  }
  