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alts: Make GoogleDefaultChannelCredentials take a CallCredentials (#8548) 

DirectPath is going to support non-default service account. This commit
allows users to pass CallCredentials to GoogleDefaultChannelCredentials.
See design in go/directpath-file-credential-google-default-creds
This commit is contained in:
Mohan Li 2021-11-15 15:46:56 -08:00 committed by GitHub
parent b746bab97b
commit a2398ce5db
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1 changed files with 57 additions and 22 deletions
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43
alts/src/main/java/io/grpc/alts/GoogleDefaultChannelCredentials.java
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@ -44,18 +44,52 @@ public final class GoogleDefaultChannelCredentials {
* as fallback.
*/
public static ChannelCredentials create() {
return newBuilder().build();
}
/**
* Returns a new instance of {@link Builder}.
*
* @since 1.42.0
*/
public static Builder newBuilder() {
return new Builder();
}
/**
* Builder for {@link GoogleDefaultChannelCredentials} instances.
*
* @since 1.42.0
*/
public static final class Builder {
private CallCredentials callCredentials;
private Builder() {}
/** Constructs GoogleDefaultChannelCredentials with a given call credential. */
public Builder callCredentials(CallCredentials callCreds) {
callCredentials = callCreds;
return this;
}
/** Builds a GoogleDefaultChannelCredentials instance. */
public ChannelCredentials build() {
ChannelCredentials nettyCredentials =
InternalNettyChannelCredentials.create(createClientFactory());
CallCredentials callCredentials;
if (callCredentials != null) {
return CompositeChannelCredentials.create(nettyCredentials, callCredentials);
}
CallCredentials callCreds;
try {
callCredentials = MoreCallCredentials.from(GoogleCredentials.getApplicationDefault());
callCreds = MoreCallCredentials.from(GoogleCredentials.getApplicationDefault());
} catch (IOException e) {
callCredentials = new FailingCallCredentials(
callCreds =
new FailingCallCredentials(
Status.UNAUTHENTICATED
.withDescription("Failed to get Google default credentials")
.withCause(e));
}
return CompositeChannelCredentials.create(nettyCredentials, callCredentials);
return CompositeChannelCredentials.create(nettyCredentials, callCreds);
}
private static InternalProtocolNegotiator.ClientFactory createClientFactory() {
@ -71,3 +105,4 @@ public final class GoogleDefaultChannelCredentials {
sslContext);
}
}
}