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Automatic download of the intermediate certificates (Fixes #217)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /** | ||
| * Copyright 2024 Emmanuel Bourg | ||
| * | ||
| * 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 net.jsign; | ||
|
|
||
| import java.io.ByteArrayInputStream; | ||
| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.net.HttpURLConnection; | ||
| import java.net.URL; | ||
| import java.nio.file.Files; | ||
| import java.security.MessageDigest; | ||
|
|
||
| import org.apache.commons.codec.binary.Hex; | ||
| import org.apache.commons.io.IOUtils; | ||
|
|
||
| /** | ||
| * Simple HTTP client with resource caching. | ||
| * | ||
| * @since 6.1 | ||
| */ | ||
| class HttpClient { | ||
|
|
||
| /** The directory where the cached files are stored */ | ||
| private final File cacheDir; | ||
|
|
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| /** The expiration time for the cached files */ | ||
| private final long expirationTime; | ||
|
|
||
| public HttpClient(File cacheDir, long expirationTime) { | ||
| this.cacheDir = cacheDir; | ||
| this.expirationTime = expirationTime; | ||
| } | ||
|
|
||
| public InputStream getInputStream(URL url) throws IOException { | ||
| File cacheFile = new File(cacheDir, getRequestHash(url) + ".cache"); | ||
| if (cacheFile.exists() && (System.currentTimeMillis() - cacheFile.lastModified()) < expirationTime) { | ||
| return new FileInputStream(cacheFile); | ||
| } else { | ||
| HttpURLConnection conn = connect(url); | ||
| if (conn.getResponseCode() >= 400) { | ||
| throw new IOException("Unable to read " + url + " : " + conn.getResponseCode() + " - " + conn.getResponseMessage()); | ||
| } | ||
|
|
||
| InputStream in = conn.getInputStream(); | ||
| byte[] response = IOUtils.toByteArray(in); | ||
| in.close(); | ||
|
|
||
| conn.disconnect(); | ||
|
|
||
| // put the response in the cache | ||
| cacheFile.getParentFile().mkdirs(); | ||
| Files.write(cacheFile.toPath(), response); | ||
|
|
||
| return new ByteArrayInputStream(response); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Connect to the specified URL and follow the redirections (including http -> https). | ||
| */ | ||
| private HttpURLConnection connect(URL url) throws IOException { | ||
| int redirections = 0; | ||
|
|
||
| while (redirections++ < 10) { | ||
| HttpURLConnection conn = (HttpURLConnection) url.openConnection(); | ||
| String userAgent = System.getProperty("http.agent"); | ||
| conn.setRequestProperty("User-Agent", "Jsign (https://ebourg.github.io/jsign/)" + (userAgent != null ? " " + userAgent : "")); | ||
| conn.setConnectTimeout(15000); | ||
| conn.setReadTimeout(15000); | ||
| conn.setInstanceFollowRedirects(false); | ||
|
|
||
| switch (conn.getResponseCode()) { | ||
| case HttpURLConnection.HTTP_MOVED_PERM: | ||
| case HttpURLConnection.HTTP_MOVED_TEMP: | ||
| url = new URL(url, conn.getHeaderField("Location")); | ||
| continue; | ||
| } | ||
|
|
||
| return conn; | ||
| } | ||
|
|
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| throw new IOException("Too many redirections for " + url); | ||
| } | ||
|
|
||
| String getRequestHash(URL url) { | ||
| MessageDigest digest = DigestAlgorithm.SHA1.getMessageDigest(); | ||
| digest.update(url.toString().getBytes()); | ||
|
|
||
| return Hex.encodeHexString(digest.digest()); | ||
| } | ||
| } |
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