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package io.fabric8.maven.docker.config;
/*
*
* Copyright 2016 Roland Huss
*
* 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
*
* http://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.
*/
import java.util.*;
import io.fabric8.maven.docker.config.handler.property.PropertyConfigHandler;
import io.fabric8.maven.docker.config.handler.property.PropertyMode;
import io.fabric8.maven.docker.util.EnvUtil;
import io.fabric8.maven.docker.util.Logger;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.project.MavenProject;
import org.apache.maven.shared.utils.StringUtils;
/**
* Utility class which helps in resolving, customizing, initializing and validating
* image configuration.
*
* @author roland
* @since 17/05/16
*/
public class ConfigHelper {
// Property which can be set to activate externalConfiguration through properties.
// Only works for single image project.
public static final String EXTERNALCONFIG_ACTIVATION_PROPERTY = "docker.imagePropertyConfiguration";
private ConfigHelper() {}
/**
* Resolve image with an external image resolver
*
* @param images the original image config list (can be null)
* @param imageResolver the resolver used to extend on an image configuration
* @param imageNameFilter filter to select only certain image configurations with the given name
* @param imageCustomizer final customization hook for mangling the configuration
* @return a list of resolved and customized image configuration.
*/
public static List resolveImages(Logger logger,
List images,
Resolver imageResolver,
String imageNameFilter,
Customizer imageCustomizer) {
List ret = resolveConfiguration(imageResolver, images);
ret = imageCustomizer.customizeConfig(ret);
List filtered = filterImages(imageNameFilter,ret);
if (ret.size() > 0 && filtered.size() == 0 && imageNameFilter != null) {
List imageNames = new ArrayList<>();
for (ImageConfiguration image : ret) {
imageNames.add(image.getName());
}
logger.warn("None of the resolved images [%s] match the configured filter '%s'",
StringUtils.join(imageNames.iterator(), ","), imageNameFilter);
}
return filtered;
}
public static void validateExternalPropertyActivation(MavenProject project, List images) throws MojoFailureException {
String prop = getExternalConfigActivationProperty(project);
if(prop == null) {
return;
}
if(images.size() == 1) {
return;
}
// With more than one image, externally activating propertyConfig get's tricky. We can only allow it to affect
// one single image. Go through each image and check if they will be controlled by default properties.
// If more than one image matches, fail.
int imagesWithoutExternalConfig = 0;
for (ImageConfiguration image : images) {
if(PropertyConfigHandler.canCoexistWithOtherPropertyConfiguredImages(image.getExternalConfig())) {
continue;
}
// else, it will be affected by the external property.
imagesWithoutExternalConfig++;
}
if(imagesWithoutExternalConfig > 1) {
throw new MojoFailureException("Configuration error: Cannot use property "+EXTERNALCONFIG_ACTIVATION_PROPERTY+" on projects with multiple images without explicit image external configuration.");
}
}
public static String getExternalConfigActivationProperty(MavenProject project) {
Properties properties = EnvUtil.getPropertiesWithSystemOverrides(project);
String value = properties.getProperty(EXTERNALCONFIG_ACTIVATION_PROPERTY);
// This can be used to disable in a more "local" context, if set globally
if(PropertyMode.Skip.name().equalsIgnoreCase(value)) {
return null;
}
return value;
}
/**
* Initialize and validate the configuration.
*
*
* @param images the images to check
* @param apiVersion the original API version intended to use
* @param nameFormatter formatter for image names
* @param log a logger for printing out diagnostic messages
* @return the minimal API Docker API required to be used for the given configuration.
*/
public static String initAndValidate(List images, String apiVersion, NameFormatter nameFormatter,
Logger log) {
// Init and validate configs. After this step, getResolvedImages() contains the valid configuration.
for (ImageConfiguration imageConfiguration : images) {
apiVersion = EnvUtil.extractLargerVersion(apiVersion, imageConfiguration.initAndValidate(nameFormatter, log));
}
return apiVersion;
}
// Check if the provided image configuration matches the given
public static boolean matchesConfiguredImages(String imageList, ImageConfiguration imageConfig) {
if (imageList == null) {
return true;
}
Set imagesAllowed = new HashSet<>(Arrays.asList(imageList.split("\\s*,\\s*")));
return imagesAllowed.contains(imageConfig.getName()) || imagesAllowed.contains(imageConfig.getAlias());
}
// ===========================================================================================================
// Filter image configuration on name. Given filter should be either null (no filter) or a comma separated
// list of image names which should be used
private static List filterImages(String nameFilter, List imagesToFilter) {
List ret = new ArrayList<>();
for (ImageConfiguration imageConfig : imagesToFilter) {
if (matchesConfiguredImages(nameFilter, imageConfig)) {
ret.add(imageConfig);
}
}
return ret;
}
// Resolve and initialize external configuration
private static List resolveConfiguration(Resolver imageResolver,
List unresolvedImages) {
List ret = new ArrayList<>();
if (unresolvedImages != null) {
for (ImageConfiguration image : unresolvedImages) {
ret.addAll(imageResolver.resolve(image));
}
verifyImageNames(ret);
}
return ret;
}
// Extract authentication information
private static void verifyImageNames(List ret) {
for (ImageConfiguration config : ret) {
if (config.getName() == null) {
throw new IllegalArgumentException("Configuration error: must have a non-null ");
}
}
}
// =========================================================================
/**
* Allow subclasses to customize the given set of image configurations. This is called
* after resolving of images. a customizer is free to change the image configuration as he want.
* Use this with responsibility.
*/
public interface Customizer {
List customizeConfig(List configs);
}
/**
* A resolver can map one given image configuration to one or more image configurations
* This is e.g. used for resolving properties
*/
public interface Resolver {
List resolve(ImageConfiguration image);
}
/**
* Format an image name by replacing certain placeholders
*/
public interface NameFormatter {
String format(String name);
NameFormatter IDENTITY = new NameFormatter() {
public String format(String name) {
return name;
}
};
}
}
