// Copyright 2022 The Bazel Authors. All rights reserved.
//
// 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.

package com.google.devtools.build.lib.authandtls;

import com.google.auth.Credentials;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import java.net.URI;
import java.util.List;
import java.util.Map;

/** Implementation of {@link Credentials} which provides a static set of credentials. */
public final class StaticCredentials extends Credentials {
  public static final StaticCredentials EMPTY = new StaticCredentials(ImmutableMap.of());

  private final ImmutableMap<URI, Map<String, List<String>>> credentials;

  public StaticCredentials(Map<URI, Map<String, List<String>>> credentials) {
    Preconditions.checkNotNull(credentials);

    this.credentials = ImmutableMap.copyOf(credentials);
  }

  @Override
  public String getAuthenticationType() {
    return "static";
  }

  @Override
  public Map<String, List<String>> getRequestMetadata(URI uri) {
    Preconditions.checkNotNull(uri);

    return credentials.getOrDefault(uri, ImmutableMap.of());
  }

  @Override
  public boolean hasRequestMetadata() {
    return true;
  }

  @Override
  public boolean hasRequestMetadataOnly() {
    return true;
  }

  @Override
  public void refresh() {
    // Can't refresh static credentials.
  }
}