HSEARCH-5464 Pluggable rest clients in the elasticsearch backend

backend/elasticsearch-aws/pom.xml

@@ -26,7 +26,7 @@
     <dependencies>
         <dependency>
             <groupId>org.hibernate.search</groupId>
-            <artifactId>hibernate-search-backend-elasticsearch</artifactId>
+            <artifactId>hibernate-search-backend-elasticsearch-client-common</artifactId>
         </dependency>
         <dependency>
             <groupId>software.amazon.awssdk</groupId>

backend/elasticsearch-aws/src/main/java/org/hibernate/search/backend/elasticsearch/aws/impl/ElasticsearchAwsBeanConfigurer.java

@@ -6,7 +6,7 @@
 
 import org.hibernate.search.backend.elasticsearch.aws.cfg.ElasticsearchAwsCredentialsTypeNames;
 import org.hibernate.search.backend.elasticsearch.aws.spi.ElasticsearchAwsCredentialsProvider;
-import org.hibernate.search.backend.elasticsearch.client.ElasticsearchHttpClientConfigurer;
+import org.hibernate.search.backend.elasticsearch.client.common.spi.ElasticsearchRequestInterceptorProvider;
 import org.hibernate.search.engine.environment.bean.BeanHolder;
 import org.hibernate.search.engine.environment.bean.spi.BeanConfigurationContext;
 import org.hibernate.search.engine.environment.bean.spi.BeanConfigurer;
@@ -17,8 +17,8 @@ public class ElasticsearchAwsBeanConfigurer implements BeanConfigurer {
 	@Override
 	public void configure(BeanConfigurationContext context) {
 		context.define(
-				ElasticsearchHttpClientConfigurer.class,
-				beanResolver -> BeanHolder.of( new ElasticsearchAwsHttpClientConfigurer() )
+				ElasticsearchRequestInterceptorProvider.class,
+				beanResolver -> BeanHolder.of( new ElasticsearchAwsSigningInterceptorProvider() )
 		);
 		context.define(
 				ElasticsearchAwsCredentialsProvider.class, ElasticsearchAwsCredentialsTypeNames.DEFAULT,

backend/elasticsearch-aws/src/main/java/org/hibernate/search/backend/elasticsearch/aws/impl/ElasticsearchAwsHttpClientConfigurer.java → backend/elasticsearch-aws/src/main/java/org/hibernate/search/backend/elasticsearch/aws/impl/ElasticsearchAwsSigningInterceptorProvider.java

@@ -4,14 +4,16 @@
  */
 package org.hibernate.search.backend.elasticsearch.aws.impl;
 
-import org.hibernate.search.backend.elasticsearch.ElasticsearchDistributionName;
-import org.hibernate.search.backend.elasticsearch.ElasticsearchVersion;
+import java.util.Locale;
+import java.util.Optional;
+import java.util.regex.Pattern;
+
 import org.hibernate.search.backend.elasticsearch.aws.cfg.ElasticsearchAwsBackendSettings;
 import org.hibernate.search.backend.elasticsearch.aws.cfg.ElasticsearchAwsCredentialsTypeNames;
 import org.hibernate.search.backend.elasticsearch.aws.logging.impl.AwsLog;
 import org.hibernate.search.backend.elasticsearch.aws.spi.ElasticsearchAwsCredentialsProvider;
-import org.hibernate.search.backend.elasticsearch.client.ElasticsearchHttpClientConfigurationContext;
-import org.hibernate.search.backend.elasticsearch.client.ElasticsearchHttpClientConfigurer;
+import org.hibernate.search.backend.elasticsearch.client.common.spi.ElasticsearchRequestInterceptor;
+import org.hibernate.search.backend.elasticsearch.client.common.spi.ElasticsearchRequestInterceptorProvider;
 import org.hibernate.search.engine.cfg.ConfigurationPropertySource;
 import org.hibernate.search.engine.cfg.spi.ConfigurationProperty;
 import org.hibernate.search.engine.cfg.spi.OptionalConfigurationProperty;
@@ -22,8 +24,8 @@
 import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
 import software.amazon.awssdk.regions.Region;
 
-public class ElasticsearchAwsHttpClientConfigurer implements ElasticsearchHttpClientConfigurer {
-
+public class ElasticsearchAwsSigningInterceptorProvider implements ElasticsearchRequestInterceptorProvider {
+	private static final Pattern DISTRIBUTION_NAME_PATTERN = Pattern.compile( "([^\\d]+)?(?:(?<=^)|(?=$)|(?<=.):(?=.))(.+)?" );
 	private static final ConfigurationProperty<Boolean> SIGNING_ENABLED =
 			ConfigurationProperty.forKey( ElasticsearchAwsBackendSettings.SIGNING_ENABLED )
 					.asBoolean()
@@ -52,36 +54,48 @@ public class ElasticsearchAwsHttpClientConfigurer implements ElasticsearchHttpCl
 					.asString()
 					.build();
 
+	static final OptionalConfigurationProperty<String> DISTRIBUTION_NAME =
+			ConfigurationProperty.forKey( "version" )
+					.asString()
+					.build();
+
 	@Override
-	public void configure(ElasticsearchHttpClientConfigurationContext context) {
+	public Optional<ElasticsearchRequestInterceptor> provide(Context context) {
 		ConfigurationPropertySource propertySource = context.configurationPropertySource();
 
 		if ( !SIGNING_ENABLED.get( propertySource ) ) {
 			AwsLog.INSTANCE.signingDisabled();
-			return;
+			return Optional.empty();
 		}
 
 		Region region = REGION.getAndMapOrThrow( propertySource, Region::of, AwsLog.INSTANCE::missingPropertyForSigning );
 		String service;
-		switch ( context.configuredVersion().map( ElasticsearchVersion::distribution )
-				.orElse( ElasticsearchDistributionName.OPENSEARCH ) ) {
-			case AMAZON_OPENSEARCH_SERVERLESS:
-				service = "aoss";
-				break;
-			case ELASTIC:
-			case OPENSEARCH:
-			default:
-				service = "es";
-				break;
+
+		String distributionName = DISTRIBUTION_NAME.getAndTransform( propertySource,
+				v -> v.map( ver -> ver.toLowerCase( Locale.ROOT ) )
+						.map( DISTRIBUTION_NAME_PATTERN::matcher )
+						.map( matcher -> {
+							if ( matcher.matches() ) {
+								return matcher.group( 1 );
+							}
+							return null;
+						} ).orElse( "opensearch" ) );
+
+		if ( "amazon-opensearch-serverless".equals( distributionName ) ) {
+			service = "aoss";
 		}
+		else {
+			service = "es";
+		}
+
 		AwsCredentialsProvider credentialsProvider = createCredentialsProvider( context.beanResolver(), propertySource );
 
 		AwsLog.INSTANCE.signingEnabled( region, service, credentialsProvider );
 
-		AwsSigningRequestInterceptor signingInterceptor =
-				new AwsSigningRequestInterceptor( region, service, credentialsProvider );
+		ElasticsearchAwsSigningRequestInterceptor signingInterceptor =
+				new ElasticsearchAwsSigningRequestInterceptor( region, service, credentialsProvider );
 
-		context.clientBuilder().addInterceptorLast( signingInterceptor );
+		return Optional.of( signingInterceptor );
 	}
 
 	private AwsCredentialsProvider createCredentialsProvider(BeanResolver beanResolver,

backend/elasticsearch-aws/src/main/java/org/hibernate/search/backend/elasticsearch/aws/impl/ElasticsearchAwsSigningRequestInterceptor.java

@@ -0,0 +1,101 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.search.backend.elasticsearch.aws.impl;
+
+import java.io.IOException;
+
+import org.hibernate.search.backend.elasticsearch.aws.logging.impl.AwsLog;
+import org.hibernate.search.backend.elasticsearch.client.common.spi.ElasticsearchRequestInterceptor;
+
+import software.amazon.awssdk.auth.credentials.AwsCredentials;
+import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
+import software.amazon.awssdk.http.ContentStreamProvider;
+import software.amazon.awssdk.http.SdkHttpFullRequest;
+import software.amazon.awssdk.http.SdkHttpMethod;
+import software.amazon.awssdk.http.auth.aws.signer.AwsV4HttpSigner;
+import software.amazon.awssdk.http.auth.spi.signer.SignedRequest;
+import software.amazon.awssdk.regions.Region;
+
+class ElasticsearchAwsSigningRequestInterceptor implements ElasticsearchRequestInterceptor {
+
+	private final AwsV4HttpSigner signer;
+	private final Region region;
+	private final String service;
+	private final AwsCredentialsProvider credentialsProvider;
+
+	ElasticsearchAwsSigningRequestInterceptor(Region region, String service, AwsCredentialsProvider credentialsProvider) {
+		this.signer = AwsV4HttpSigner.create();
+		this.region = region;
+		this.service = service;
+		this.credentialsProvider = credentialsProvider;
+	}
+
+	@Override
+	public void intercept(RequestContext requestContext) throws IOException {
+		try ( HttpEntityContentStreamProvider contentStreamProvider =
+				HttpEntityContentStreamProvider.create( requestContext ) ) {
+			sign( requestContext, contentStreamProvider );
+		}
+	}
+
+	private void sign(RequestContext requestContext, HttpEntityContentStreamProvider contentStreamProvider) {
+		SdkHttpFullRequest awsRequest = toAwsRequest( requestContext, contentStreamProvider );
+
+		if ( AwsLog.INSTANCE.isTraceEnabled() ) {
+			AwsLog.INSTANCE.httpRequestBeforeSigning( requestContext );
+			AwsLog.INSTANCE.awsRequestBeforeSigning( awsRequest );
+		}
+
+		AwsCredentials credentials = credentialsProvider.resolveCredentials();
+		AwsLog.INSTANCE.awsCredentials( credentials );
+
+		SignedRequest signedRequest = signer.sign( r -> r.identity( credentials )
+				.request( awsRequest )
+				.payload( awsRequest.contentStreamProvider().orElse( null ) )
+				.putProperty( AwsV4HttpSigner.SERVICE_SIGNING_NAME, service )
+				.putProperty( AwsV4HttpSigner.REGION_NAME, region.id() ) );
+
+		// The AWS SDK added some headers.
+		// Let's just override the existing headers with whatever the AWS SDK came up with.
+		// We don't expect signing to affect anything else (path, query, content, ...).
+		requestContext.overrideHeaders( signedRequest.request().headers() );
+
+		if ( AwsLog.INSTANCE.isTraceEnabled() ) {
+			AwsLog.INSTANCE.httpRequestAfterSigning( signedRequest );
+			AwsLog.INSTANCE.awsRequestAfterSigning( requestContext );
+		}
+	}
+
+	private SdkHttpFullRequest toAwsRequest(RequestContext requestContext,
+			ContentStreamProvider contentStreamProvider) {
+		SdkHttpFullRequest.Builder awsRequestBuilder = SdkHttpFullRequest.builder();
+
+		awsRequestBuilder.host( requestContext.host() );
+		awsRequestBuilder.port( requestContext.port() );
+		awsRequestBuilder.protocol( requestContext.scheme() );
+
+		awsRequestBuilder.method( SdkHttpMethod.fromValue( requestContext.method() ) );
+
+		String path = requestContext.path();
+
+		// For some reason this is needed on Amazon OpenSearch Serverless
+		if ( "aoss".equals( service ) ) {
+			awsRequestBuilder.appendHeader( "x-amz-content-sha256", "required" );
+		}
+
+		awsRequestBuilder.encodedPath( path );
+		for ( var param : requestContext.queryParameters().entrySet() ) {
+			awsRequestBuilder.appendRawQueryParameter( param.getKey(), param.getValue() );
+		}
+
+		// Do NOT copy the headers, as the AWS SDK will sometimes sign some headers
+		// that are not properly taken into account by the AWS servers (e.g. content-length).
+
+		awsRequestBuilder.contentStreamProvider( contentStreamProvider );
+
+		return awsRequestBuilder.build();
+	}
+
+}