2020-12-27 16:25:30 +00:00
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/*
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* This file is part of fabric-loom, licensed under the MIT License (MIT).
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*
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* Copyright (c) 2016, 2017, 2018 FabricMC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package net.fabricmc.loom.util;
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import java.io.File;
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2021-03-04 23:50:02 +00:00
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import java.io.FileNotFoundException;
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2020-12-27 16:25:30 +00:00
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import java.io.IOException;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.nio.charset.StandardCharsets;
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import javax.annotation.Nullable;
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import com.google.common.hash.Hashing;
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import com.google.common.io.Files;
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import org.apache.commons.io.FileUtils;
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import org.gradle.api.logging.Logger;
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import net.fabricmc.loom.LoomGradlePlugin;
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public class HashedDownloadUtil {
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public static void downloadIfInvalid(URL from, File to, String expectedHash, Logger logger, boolean quiet) throws IOException {
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downloadIfInvalid(from, to, expectedHash, logger, quiet, () -> { });
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}
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public static void downloadIfInvalid(URL from, File to, String expectedHash, Logger logger, boolean quiet, Runnable startDownload) throws IOException {
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if (LoomGradlePlugin.refreshDeps) {
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delete(to);
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}
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2021-03-04 23:50:02 +00:00
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String sha1 = getSha1(to, logger);
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2020-12-27 16:25:30 +00:00
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2021-03-04 23:50:02 +00:00
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if (expectedHash.equals(sha1)) {
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// The hash in the sha1 file matches
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return;
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2020-12-27 16:25:30 +00:00
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}
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2021-03-04 23:50:02 +00:00
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startDownload.run();
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2020-12-27 16:25:30 +00:00
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HttpURLConnection connection = (HttpURLConnection) from.openConnection();
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connection.setRequestProperty("Accept-Encoding", "gzip");
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connection.connect();
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int code = connection.getResponseCode();
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if ((code < 200 || code > 299) && code != HttpURLConnection.HTTP_NOT_MODIFIED) {
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//Didn't get what we expected
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delete(to);
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2020-12-27 16:25:30 +00:00
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throw new IOException(connection.getResponseMessage() + " for " + from);
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}
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long contentLength = connection.getContentLengthLong();
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if (!quiet && contentLength >= 0) {
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logger.info("'{}' Changed, downloading {}", to, DownloadUtil.toNiceSize(contentLength));
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}
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try { // Try download to the output
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FileUtils.copyInputStreamToFile(connection.getInputStream(), to);
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} catch (IOException e) {
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delete(to); // Probably isn't good if it fails to copy/save
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throw e;
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}
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if (!Checksum.equals(to, expectedHash)) {
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String actualHash = Files.asByteSource(to).hash(Hashing.sha1()).toString();
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delete(to);
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throw new IOException(String.format("Downloaded file from %s to %s and got unexpected hash of %s expected %s", from, to, actualHash, expectedHash));
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}
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saveSha1(to, expectedHash, logger);
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}
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private static File getSha1File(File file) {
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return new File(file.getAbsoluteFile().getParentFile(), file.getName() + ".sha1");
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}
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@Nullable
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private static String getSha1(File to, Logger logger) {
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File sha1File = getSha1File(to);
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try {
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return Files.asCharSource(sha1File, StandardCharsets.UTF_8).read();
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} catch (FileNotFoundException ignored) {
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// Quicker to catch this than do an exists check before.
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return null;
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2020-12-27 16:25:30 +00:00
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} catch (IOException e) {
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logger.warn("Error reading sha1 file '{}'.", sha1File);
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return null;
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}
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}
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private static void saveSha1(File to, String sha1, Logger logger) {
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File sha1File = getSha1File(to);
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try {
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if (!sha1File.exists()) {
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sha1File.createNewFile();
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}
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Files.asCharSink(sha1File, StandardCharsets.UTF_8).write(sha1);
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} catch (IOException e) {
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logger.warn("Error saving sha1 file '{}'.", sha1File, e);
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}
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}
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public static void delete(File file) {
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if (file.exists()) {
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file.delete();
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}
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File sha1File = getSha1File(file);
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if (sha1File.exists()) {
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sha1File.delete();
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}
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}
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}
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