org.apache.hive.http.JdbcJarDownloadServlet Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hive.http;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.filefilter.WildcardFileFilter;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class JdbcJarDownloadServlet extends HttpServlet {
private static final Log LOG = LogFactory.getLog(JdbcJarDownloadServlet.class);
private static final String JDBC_JAR_DIR = System.getenv("HIVE_HOME") + "/jdbc/";
private static final String JDBC_JAR_PATTERN = "hive-jdbc-*-standalone.jar";
private static final String JAR_CONTENT_DISPOSITION = "attachment; filename=hive-jdbc-standalone.jar";
private static final String JAR_CONTENT_TYPE = "application/java-archive";
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
LOG.info("Requesting jdbc standalone jar download");
response.setHeader("Content-disposition", JAR_CONTENT_DISPOSITION);
response.setContentType(JAR_CONTENT_TYPE);
File dir = new File(JDBC_JAR_DIR);
FileFilter fileFilter = new WildcardFileFilter(JDBC_JAR_PATTERN);
File[] files = dir.listFiles(fileFilter);
if (files == null || files.length != 1) {
handleError(files);
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
File file = files[0];
LOG.info("Jdbc standalone jar found: " + file.getAbsolutePath());
try (FileInputStream in = new FileInputStream(file);
OutputStream out = response.getOutputStream()) {
byte[] buffer = new byte[4096];
int length;
while ((length = in.read(buffer)) > 0) {
out.write(buffer, 0, length);
}
} catch (Exception e) {
LOG.error("Exception during downloading standalone jdbc jar", e);
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
LOG.info("Jdbc standalone jar " + file.getAbsolutePath() + " was downloaded");
}
private void handleError(File[] files) {
if (ArrayUtils.isEmpty(files)) {
LOG.error("No jdbc standalone jar found in the directory " + JDBC_JAR_DIR);
} else {
StringBuilder fileNames = new StringBuilder();
for (File file : files) {
fileNames.append("\t" + file.getAbsolutePath() + "\n");
}
LOG.error("Multiple jdbc standalone jars exist in the directory " + JDBC_JAR_DIR + ":\n" + fileNames);
}
}
}