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Wire up credential helper to command-line flag(s)
RELNOTES: Add support for fetching RPC credentials from a credential helper. This release note clearly needs improvement! Progress on bazelbuild#15856
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137 changes: 137 additions & 0 deletions
137
...om/google/devtools/build/lib/authandtls/credentialhelper/CredentialHelperCredentials.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| 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; | ||
|
|
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| /** | ||
| * Implementation of {@link Credentials} which fetches credentials by invoking a {@code credential | ||
| * helper} as subprocess. | ||
| */ | ||
| 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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|
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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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| private Optional<Map<String, List<String>>> getRequestMetadataFromCredentialHelper( | ||
| URI uri) throws IOException { | ||
| Preconditions.checkNotNull(uri); | ||
|
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| GetCredentialsResponse response = credentialCache.get(uri); | ||
| if (response == null) { | ||
| return Optional.empty(); | ||
| } | ||
|
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| // The cast is needed to convert value type of map from `ImmutableList` to `List`. | ||
| return Optional.of((Map)response.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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| @Override | ||
| public GetCredentialsResponse load(URI uri) throws IOException, InterruptedException { | ||
| Preconditions.checkNotNull(uri); | ||
|
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| Optional<GetCredentialsResponse> response = loadInternal(uri); | ||
| if (response.isPresent()) { | ||
| return response.get(); | ||
| } | ||
|
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| return null; | ||
| } | ||
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| private Optional<GetCredentialsResponse> loadInternal(URI uri) throws IOException, InterruptedException { | ||
| Preconditions.checkNotNull(uri); | ||
|
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| Optional<CredentialHelper> maybeCredentialHelper = credentialHelperProvider.findCredentialHelper(uri); | ||
| if (!maybeCredentialHelper.isPresent()) { | ||
| return Optional.empty(); | ||
| } | ||
| CredentialHelper credentialHelper = maybeCredentialHelper.get(); | ||
|
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| return Optional.of(credentialHelper.getCredentials(credentialHelperEnvironment, uri)); | ||
| } | ||
| } | ||
| } |
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