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Wire up credential helper to command-line flag(s) (bazelbuild#15976)
RELNOTES: Add support for fetching RPC credentials from credential helper. Progress on bazelbuild#15856 Closes bazelbuild#15947. PiperOrigin-RevId: 463083408 Change-Id: I286aa82fbb3c2376e4dba82cbb01e541c40e405e Co-authored-by: Yannic Bonenberger <yannic@engflow.com>
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...om/google/devtools/build/lib/authandtls/credentialhelper/CredentialHelperCredentials.java
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| @@ -0,0 +1,141 @@ | ||
| // 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. | ||
|
|
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| package com.google.devtools.build.lib.authandtls.credentialhelper; | ||
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| 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; | ||
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| private final LoadingCache<URI, GetCredentialsResponse> credentialCache; | ||
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| 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"); | ||
|
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| credentialCache = | ||
| Caffeine.newBuilder() | ||
| .expireAfterWrite(cacheTimeout) | ||
| .build( | ||
| new CredentialHelperCacheLoader( | ||
| credentialHelperProvider, credentialHelperEnvironment)); | ||
| } | ||
|
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| @Override | ||
| public String getAuthenticationType() { | ||
| if (fallbackCredentials.isPresent()) { | ||
| return "credential-helper-with-fallback-" + fallbackCredentials.get().getAuthenticationType(); | ||
| } | ||
|
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| return "credential-helper"; | ||
| } | ||
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| @Override | ||
| public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException { | ||
| Preconditions.checkNotNull(uri); | ||
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| Optional<Map<String, List<String>>> credentials = getRequestMetadataFromCredentialHelper(uri); | ||
| if (credentials.isPresent()) { | ||
| return credentials.get(); | ||
| } | ||
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| if (fallbackCredentials.isPresent()) { | ||
| return fallbackCredentials.get().getRequestMetadata(uri); | ||
| } | ||
|
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| return ImmutableMap.of(); | ||
| } | ||
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| @SuppressWarnings("unchecked") // Map<String, ImmutableList<String>> to Map<String<List<String>> | ||
| private Optional<Map<String, List<String>>> getRequestMetadataFromCredentialHelper(URI uri) { | ||
| Preconditions.checkNotNull(uri); | ||
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| GetCredentialsResponse response = credentialCache.get(uri); | ||
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| return Optional.ofNullable(response).map(value -> (Map) value.getHeaders()); | ||
| } | ||
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| @Override | ||
| public boolean hasRequestMetadata() { | ||
| return true; | ||
| } | ||
|
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| @Override | ||
| public boolean hasRequestMetadataOnly() { | ||
| return false; | ||
| } | ||
|
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| @Override | ||
| public void refresh() throws IOException { | ||
| if (fallbackCredentials.isPresent()) { | ||
| fallbackCredentials.get().refresh(); | ||
| } | ||
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| credentialCache.invalidateAll(); | ||
| } | ||
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| private static final class CredentialHelperCacheLoader | ||
| implements CacheLoader<URI, GetCredentialsResponse> { | ||
| private final CredentialHelperProvider credentialHelperProvider; | ||
| private final CredentialHelperEnvironment credentialHelperEnvironment; | ||
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| public CredentialHelperCacheLoader( | ||
| CredentialHelperProvider credentialHelperProvider, | ||
| CredentialHelperEnvironment credentialHelperEnvironment) { | ||
| this.credentialHelperProvider = Preconditions.checkNotNull(credentialHelperProvider); | ||
| this.credentialHelperEnvironment = Preconditions.checkNotNull(credentialHelperEnvironment); | ||
| } | ||
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| @Nullable | ||
| @Override | ||
| public GetCredentialsResponse load(URI uri) throws IOException, InterruptedException { | ||
| Preconditions.checkNotNull(uri); | ||
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| Optional<CredentialHelper> maybeCredentialHelper = | ||
| credentialHelperProvider.findCredentialHelper(uri); | ||
| if (maybeCredentialHelper.isEmpty()) { | ||
| return null; | ||
| } | ||
| CredentialHelper credentialHelper = maybeCredentialHelper.get(); | ||
|
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| return credentialHelper.getCredentials(credentialHelperEnvironment, uri); | ||
| } | ||
| } | ||
| } |
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