gradle-master/subprojects/dependency-management/src/main/java/org/gradle/internal/resource/transfer/DownloadAction.java
/*
 * Copyright 2022 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
 *
 *      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.
 */

package org.gradle.internal.resource.transfer;

import org.apache.commons.io.IOUtils;
import org.gradle.api.internal.file.temp.TemporaryFileProvider;
import org.gradle.internal.resource.ExternalResource;
import org.gradle.internal.resource.ExternalResourceName;
import org.gradle.internal.resource.metadata.ExternalResourceMetaData;
import org.gradle.util.internal.GFileUtils;
import org.slf4j.Logger;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class DownloadAction implements ExternalResource.ContentAndMetadataAction<Object> {
    private File destination;
    private ExternalResourceMetaData metaData;
    private final ExternalResourceName source;
    private final TemporaryFileProvider temporaryFileProvider;
    @Nullable
    private final Logger logger;

    public DownloadAction(ExternalResourceName source, TemporaryFileProvider temporaryFileProvider, @Nullable Logger logger) {
        this.source = source;
        this.temporaryFileProvider = temporaryFileProvider;
        this.logger = logger;
    }

    @Override
    public Object execute(InputStream inputStream, ExternalResourceMetaData metaData) throws IOException {
        destination = temporaryFileProvider.createTemporaryFile("gradle_download", "bin");
        this.metaData = metaData;
        if (logger != null) {
            logger.info("Downloading {} to {}", source, destination);
        }
        if (destination.getParentFile() != null) {
            GFileUtils.mkdirs(destination.getParentFile());
        }
        try (FileOutputStream outputStream = new FileOutputStream(destination)) {
            IOUtils.copyLarge(inputStream, outputStream);
        }
        return null;
    }

    @Nonnull
    public File getDestination() {
        return destination;
    }

    @Nullable
    public ExternalResourceMetaData getMetaData() {
        return metaData;
    }
}
