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JwtCallCredentials.java
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JwtCallCredentials.java
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package com.avast.grpc.jwt.client;
import com.avast.grpc.jwt.Constants;
import io.grpc.CallCredentials;
import io.grpc.Metadata;
import io.grpc.Status;
import java.util.concurrent.Executor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class JwtCallCredentials extends CallCredentials {
private static Logger LOGGER = LoggerFactory.getLogger(JwtCallCredentials.class);
public static JwtCallCredentials synchronous(SynchronousJwtTokenProvider tokenProvider) {
return new Synchronous(tokenProvider);
}
public static JwtCallCredentials blocking(BlockingJwtTokenProvider tokenProvider) {
return new Blocking(tokenProvider);
}
public static JwtCallCredentials asynchronous(AsyncJwtTokenProvider tokenProvider) {
return new Asynchronous(tokenProvider);
}
@Override
public void thisUsesUnstableApi() {}
protected void applyToken(MetadataApplier applier, String jwtToken) {
Metadata metadata = new Metadata();
metadata.put(Constants.AuthorizationMetadataKey, "Bearer " + jwtToken);
applier.apply(metadata);
}
protected void applyFailure(MetadataApplier applier, Throwable e) {
String msg = "An exception when obtaining JWT token";
LOGGER.error(msg, e);
applier.fail(Status.UNAUTHENTICATED.withDescription(msg).withCause(e));
}
public static class Synchronous extends JwtCallCredentials {
private final SynchronousJwtTokenProvider jwtTokenProvider;
public Synchronous(SynchronousJwtTokenProvider jwtTokenProvider) {
this.jwtTokenProvider = jwtTokenProvider;
}
@Override
public void applyRequestMetadata(
RequestInfo requestInfo, Executor appExecutor, MetadataApplier applier) {
try {
applyToken(applier, jwtTokenProvider.get());
} catch (RuntimeException e) {
applyFailure(applier, e);
}
}
}
public static class Blocking extends JwtCallCredentials {
private final BlockingJwtTokenProvider jwtTokenProvider;
public Blocking(BlockingJwtTokenProvider jwtTokenProvider) {
this.jwtTokenProvider = jwtTokenProvider;
}
@Override
public void applyRequestMetadata(
RequestInfo requestInfo, Executor appExecutor, MetadataApplier applier) {
appExecutor.execute(
() -> {
try {
applyToken(applier, jwtTokenProvider.get());
} catch (RuntimeException e) {
applyFailure(applier, e);
}
});
}
}
public static class Asynchronous extends JwtCallCredentials {
private final AsyncJwtTokenProvider jwtTokenProvider;
public Asynchronous(AsyncJwtTokenProvider jwtTokenProvider) {
this.jwtTokenProvider = jwtTokenProvider;
}
@Override
public void applyRequestMetadata(
RequestInfo requestInfo, Executor appExecutor, MetadataApplier applier) {
jwtTokenProvider
.get()
.whenComplete(
(token, e) -> {
if (token != null) applyToken(applier, token);
else applyFailure(applier, e);
});
}
}
}