io.opentelemetry.exporter.internal.auth.Authenticator Maven / Gradle / Ivy
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.exporter.internal.auth;
import io.opentelemetry.exporter.internal.grpc.GrpcExporterBuilder;
import io.opentelemetry.exporter.internal.http.HttpExporterBuilder;
import java.lang.reflect.Field;
import java.util.Map;
/**
* This class is internal and is hence not for public use. Its APIs are unstable and can change at
* any time.
*
* Allow users of OTLP-OkHttp exporters to add support for authentication.
*/
public interface Authenticator {
/**
* Method called by the exporter to get headers to be used on a request that requires
* authentication.
*
* @return Headers to add to the request
*/
Map getHeaders();
/**
* Reflectively access a {@link GrpcExporterBuilder}, or {@link HttpExporterBuilder} instance in
* field called "delegate" of the instance, and set the {@link Authenticator}.
*
* @param builder export builder to modify
* @param authenticator authenticator to set on builder
* @throws IllegalArgumentException if the instance does not contain a field called "delegate" of
* a supported type.
*/
static void setAuthenticatorOnDelegate(Object builder, Authenticator authenticator) {
try {
Field field = builder.getClass().getDeclaredField("delegate");
field.setAccessible(true);
Object value = field.get(builder);
if (value instanceof GrpcExporterBuilder) {
throw new IllegalArgumentException("GrpcExporterBuilder not supported yet.");
} else if (value instanceof HttpExporterBuilder) {
((HttpExporterBuilder) value).setAuthenticator(authenticator);
} else {
throw new IllegalArgumentException(
"Delegate field is not type DefaultGrpcExporterBuilder or OkHttpGrpcExporterBuilder.");
}
} catch (NoSuchFieldException | IllegalAccessException e) {
throw new IllegalArgumentException("Unable to access delegate reflectively.", e);
}
}
}