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CredentialHelperCredentials.java
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CredentialHelperCredentials.java
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// 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.credentialhelper;
import com.github.benmanes.caffeine.cache.CacheLoader;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import com.google.auth.Credentials;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.net.URI;
import java.time.Duration;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import javax.annotation.Nullable;
/**
* Implementation of {@link Credentials} which fetches credentials by invoking a {@code credential
* helper} as subprocess, falling back to another {@link Credentials} if no suitable helper exists.
*/
public class CredentialHelperCredentials extends Credentials {
private final Optional<Credentials> fallbackCredentials;
private final LoadingCache<URI, GetCredentialsResponse> credentialCache;
public CredentialHelperCredentials(
CredentialHelperProvider credentialHelperProvider,
CredentialHelperEnvironment credentialHelperEnvironment,
Optional<Credentials> fallbackCredentials,
Duration cacheTimeout) {
Preconditions.checkNotNull(credentialHelperProvider);
Preconditions.checkNotNull(credentialHelperEnvironment);
this.fallbackCredentials = Preconditions.checkNotNull(fallbackCredentials);
Preconditions.checkNotNull(cacheTimeout);
Preconditions.checkArgument(
!cacheTimeout.isNegative() && !cacheTimeout.isZero(),
"Cache timeout must be greater than 0");
credentialCache =
Caffeine.newBuilder()
.expireAfterWrite(cacheTimeout)
.build(
new CredentialHelperCacheLoader(
credentialHelperProvider, credentialHelperEnvironment));
}
@Override
public String getAuthenticationType() {
if (fallbackCredentials.isPresent()) {
return "credential-helper-with-fallback-" + fallbackCredentials.get().getAuthenticationType();
}
return "credential-helper";
}
@Override
public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException {
Preconditions.checkNotNull(uri);
Optional<Map<String, List<String>>> credentials = getRequestMetadataFromCredentialHelper(uri);
if (credentials.isPresent()) {
return credentials.get();
}
if (fallbackCredentials.isPresent()) {
return fallbackCredentials.get().getRequestMetadata(uri);
}
return ImmutableMap.of();
}
@SuppressWarnings("unchecked") // Map<String, ImmutableList<String>> to Map<String<List<String>>
private Optional<Map<String, List<String>>> getRequestMetadataFromCredentialHelper(URI uri) {
Preconditions.checkNotNull(uri);
GetCredentialsResponse response = credentialCache.get(uri);
return Optional.ofNullable(response).map(value -> (Map) value.getHeaders());
}
@Override
public boolean hasRequestMetadata() {
return true;
}
@Override
public boolean hasRequestMetadataOnly() {
return false;
}
@Override
public void refresh() throws IOException {
if (fallbackCredentials.isPresent()) {
fallbackCredentials.get().refresh();
}
credentialCache.invalidateAll();
}
private static final class CredentialHelperCacheLoader
implements CacheLoader<URI, GetCredentialsResponse> {
private final CredentialHelperProvider credentialHelperProvider;
private final CredentialHelperEnvironment credentialHelperEnvironment;
public CredentialHelperCacheLoader(
CredentialHelperProvider credentialHelperProvider,
CredentialHelperEnvironment credentialHelperEnvironment) {
this.credentialHelperProvider = Preconditions.checkNotNull(credentialHelperProvider);
this.credentialHelperEnvironment = Preconditions.checkNotNull(credentialHelperEnvironment);
}
@Nullable
@Override
public GetCredentialsResponse load(URI uri) throws IOException, InterruptedException {
Preconditions.checkNotNull(uri);
Optional<CredentialHelper> maybeCredentialHelper =
credentialHelperProvider.findCredentialHelper(uri);
if (maybeCredentialHelper.isEmpty()) {
return null;
}
CredentialHelper credentialHelper = maybeCredentialHelper.get();
return credentialHelper.getCredentials(credentialHelperEnvironment, uri);
}
}
}