Polish

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/build/Builder.java

@@ -45,18 +45,36 @@ public class Builder {
 
 	private final DockerApi docker;
 
+	/**
+	 * Create a new builder instance.
+	 */
 	public Builder() {
 		this(BuildLog.toSystemOut());
 	}
 
+	/**
+	 * Create a new builder instance.
+	 * @param dockerConfiguration the docker configuration
+	 * @since 2.4.0
+	 */
 	public Builder(DockerConfiguration dockerConfiguration) {
 		this(BuildLog.toSystemOut(), dockerConfiguration);
 	}
 
+	/**
+	 * Create a new builder instance.
+	 * @param log a logger used to record output
+	 */
 	public Builder(BuildLog log) {
 		this(log, new DockerApi());
 	}
 
+	/**
+	 * Create a new builder instance.
+	 * @param log a logger used to record output
+	 * @param dockerConfiguration the docker configuration
+	 * @since 2.4.0
+	 */
 	public Builder(BuildLog log, DockerConfiguration dockerConfiguration) {
 		this(log, new DockerApi(dockerConfiguration));
 	}

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/DockerApi.java

@@ -74,7 +74,8 @@ public class DockerApi {
 
 	/**
 	 * Create a new {@link DockerApi} instance.
-	 * @param dockerConfiguration the Docker configuration options
+	 * @param dockerConfiguration the docker configuration
+	 * @since 2.4.0
 	 */
 	public DockerApi(DockerConfiguration dockerConfiguration) {
 		this(HttpTransport.create(dockerConfiguration));

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/configuration/DockerRegistryAuthentication.java

@@ -16,26 +16,18 @@
 
 package org.springframework.boot.buildpack.platform.docker.configuration;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-
-import org.springframework.boot.buildpack.platform.json.SharedObjectMapper;
-import org.springframework.util.Base64Utils;
-
 /**
  * Docker registry authentication configuration.
  *
  * @author Scott Frederick
  * @since 2.4.0
  */
-public abstract class DockerRegistryAuthentication {
+public interface DockerRegistryAuthentication {
 
-	public String createAuthHeader() {
-		try {
-			return Base64Utils.encodeToUrlSafeString(SharedObjectMapper.get().writeValueAsBytes(this));
-		}
-		catch (JsonProcessingException ex) {
-			throw new IllegalStateException("Error creating Docker registry authentication header", ex);
-		}
-	}
+	/**
+	 * Create the auth header that should be used for docker authentication.
+	 * @return the auth header
+	 */
+	String createAuthHeader();
 
 }

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/configuration/DockerRegistryTokenAuthentication.java

@@ -23,7 +23,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
  *
  * @author Scott Frederick
  */
-class DockerRegistryTokenAuthentication extends DockerRegistryAuthentication {
+class DockerRegistryTokenAuthentication extends JsonEncodedDockerRegistryAuthentication {
 
 	@JsonProperty("identitytoken")
 	private final String token;

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/configuration/DockerRegistryUserAuthentication.java

@@ -23,7 +23,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
  *
  * @author Scott Frederick
  */
-class DockerRegistryUserAuthentication extends DockerRegistryAuthentication {
+class DockerRegistryUserAuthentication extends JsonEncodedDockerRegistryAuthentication {
 
 	@JsonProperty
 	private final String username;

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/configuration/JsonEncodedDockerRegistryAuthentication.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.buildpack.platform.docker.configuration;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+
+import org.springframework.boot.buildpack.platform.json.SharedObjectMapper;
+import org.springframework.util.Base64Utils;
+
+/**
+ * {@link DockerRegistryAuthentication} that uses creates a Base64 encoded auth header
+ * value based on the JSON created from the instance.
+ *
+ * @author Scott Frederick
+ */
+class JsonEncodedDockerRegistryAuthentication implements DockerRegistryAuthentication {
+
+	@Override
+	public String createAuthHeader() {
+		try {
+			return Base64Utils.encodeToUrlSafeString(SharedObjectMapper.get().writeValueAsBytes(this));
+		}
+		catch (JsonProcessingException ex) {
+			throw new IllegalStateException("Error creating Docker registry authentication header", ex);
+		}
+	}
+
+}

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/transport/HttpClientTransport.java

@@ -37,6 +37,7 @@ import org.apache.http.entity.AbstractHttpEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
 
 import org.springframework.boot.buildpack.platform.docker.configuration.DockerConfiguration;
+import org.springframework.boot.buildpack.platform.docker.configuration.DockerRegistryAuthentication;
 import org.springframework.boot.buildpack.platform.io.Content;
 import org.springframework.boot.buildpack.platform.io.IOConsumer;
 import org.springframework.boot.buildpack.platform.json.SharedObjectMapper;
@@ -122,11 +123,9 @@ abstract class HttpClientTransport implements HttpTransport {
 	}
 
 	private String buildRegistryAuthHeader(DockerConfiguration dockerConfiguration) {
-		if (dockerConfiguration == null || dockerConfiguration.getRegistryAuthentication() == null) {
-			return null;
-		}
-
-		String authHeader = dockerConfiguration.getRegistryAuthentication().createAuthHeader();
+		DockerRegistryAuthentication authentication = (dockerConfiguration != null)
+				? dockerConfiguration.getRegistryAuthentication() : null;
+		String authHeader = (authentication != null) ? authentication.createAuthHeader() : null;
 		return (StringUtils.hasText(authHeader)) ? authHeader : null;
 	}