| /** |
| * 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.hadoop.fs.http.client; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.fs.Path; |
| import org.json.simple.parser.JSONParser; |
| import org.json.simple.parser.ParseException; |
| |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.net.HttpURLConnection; |
| import java.net.URI; |
| import java.net.URL; |
| import java.net.URLEncoder; |
| import java.nio.charset.StandardCharsets; |
| import java.text.MessageFormat; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Utility methods used by HttpFS classes. |
| */ |
| @InterfaceAudience.Private |
| public class HttpFSUtils { |
| |
| public static final String SERVICE_NAME = "/webhdfs"; |
| |
| public static final String SERVICE_VERSION = "/v1"; |
| |
| public static final byte[] EMPTY_BYTES = {}; |
| |
| private static final String SERVICE_PATH = SERVICE_NAME + SERVICE_VERSION; |
| |
| /** |
| * Convenience method that creates an HTTP <code>URL</code> for the |
| * HttpFSServer file system operations. |
| * <p/> |
| * |
| * @param path the file path. |
| * @param params the query string parameters. |
| * |
| * @return a <code>URL</code> for the HttpFSServer server, |
| * |
| * @throws IOException thrown if an IO error occurs. |
| */ |
| static URL createURL(Path path, Map<String, String> params) |
| throws IOException { |
| return createURL(path, params, null); |
| } |
| |
| /** |
| * Convenience method that creates an HTTP <code>URL</code> for the |
| * HttpFSServer file system operations. |
| * <p/> |
| * |
| * @param path the file path. |
| * @param params the query string parameters. |
| * @param multiValuedParams multi valued parameters of the query string |
| * |
| * @return URL a <code>URL</code> for the HttpFSServer server, |
| * |
| * @throws IOException thrown if an IO error occurs. |
| */ |
| static URL createURL(Path path, Map<String, String> params, Map<String, |
| List<String>> multiValuedParams) throws IOException { |
| URI uri = path.toUri(); |
| String realScheme; |
| if (uri.getScheme().equalsIgnoreCase(HttpFSFileSystem.SCHEME)) { |
| realScheme = "http"; |
| } else if (uri.getScheme().equalsIgnoreCase(HttpsFSFileSystem.SCHEME)) { |
| realScheme = "https"; |
| |
| } else { |
| throw new IllegalArgumentException(MessageFormat.format( |
| "Invalid scheme [{0}] it should be '" + HttpFSFileSystem.SCHEME + "' " + |
| "or '" + HttpsFSFileSystem.SCHEME + "'", uri)); |
| } |
| StringBuilder sb = new StringBuilder(); |
| sb.append(realScheme).append("://").append(uri.getAuthority()). |
| append(SERVICE_PATH).append(uri.getPath()); |
| |
| String separator = "?"; |
| for (Map.Entry<String, String> entry : params.entrySet()) { |
| sb.append(separator).append(entry.getKey()).append("="). |
| append(URLEncoder.encode(entry.getValue(), "UTF8")); |
| separator = "&"; |
| } |
| if (multiValuedParams != null) { |
| for (Map.Entry<String, List<String>> multiValuedEntry : |
| multiValuedParams.entrySet()) { |
| String name = URLEncoder.encode(multiValuedEntry.getKey(), "UTF8"); |
| List<String> values = multiValuedEntry.getValue(); |
| for (String value : values) { |
| sb.append(separator).append(name).append("="). |
| append(URLEncoder.encode(value, "UTF8")); |
| separator = "&"; |
| } |
| } |
| } |
| return new URL(sb.toString()); |
| } |
| |
| /** |
| * Convenience method that JSON Parses the <code>InputStream</code> of a |
| * <code>HttpURLConnection</code>. |
| * |
| * @param conn the <code>HttpURLConnection</code>. |
| * |
| * @return the parsed JSON object. |
| * |
| * @throws IOException thrown if the <code>InputStream</code> could not be |
| * JSON parsed. |
| */ |
| static Object jsonParse(HttpURLConnection conn) throws IOException { |
| try { |
| JSONParser parser = new JSONParser(); |
| return parser.parse( |
| new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8)); |
| } catch (ParseException ex) { |
| throw new IOException("JSON parser error, " + ex.getMessage(), ex); |
| } |
| } |
| } |