| /* |
| * 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.drill.exec.server.rest; |
| |
| import org.apache.drill.common.config.DrillConfig; |
| import org.apache.drill.exec.ExecConstants; |
| import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint; |
| import org.apache.drill.exec.work.WorkManager; |
| import org.apache.http.client.config.RequestConfig; |
| import org.apache.http.client.methods.HttpRequestBase; |
| import org.apache.http.conn.ssl.TrustSelfSignedStrategy; |
| import org.apache.http.impl.nio.client.CloseableHttpAsyncClient; |
| import org.apache.http.impl.nio.client.HttpAsyncClientBuilder; |
| import org.apache.http.impl.nio.client.HttpAsyncClients; |
| import org.apache.http.nio.conn.ssl.SSLIOSessionStrategy; |
| import org.apache.http.ssl.SSLContexts; |
| |
| import javax.net.ssl.SSLContext; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpSession; |
| import java.io.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.security.SecureRandom; |
| import java.util.Base64; |
| import java.util.stream.Collectors; |
| |
| public class WebUtils { |
| |
| private static CloseableHttpAsyncClient httpClient; |
| |
| /** |
| * Retrieves the CSRF protection token from the HTTP request. |
| * |
| * @param request HTTP request that contains a session that stores a CSRF protection token. |
| * If there is no session, that means that authentication is disabled. |
| * @return CSRF protection token, or an empty string if there is no session present. |
| */ |
| public static String getCsrfTokenFromHttpRequest(HttpServletRequest request) { |
| // No need to create a session if not present (i.e. if a user is logged in) |
| HttpSession session = request.getSession(false); |
| return session == null ? "" : (String) session.getAttribute(WebServerConstants.CSRF_TOKEN); |
| } |
| |
| /** |
| * Generates a BASE64 encoded CSRF token from randomly generated 256-bit buffer |
| * according to the <a href="https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html">OWASP CSRF Prevention Cheat Sheet</a> |
| * |
| * @return randomly generated CSRF token. |
| */ |
| public static String generateCsrfToken() { |
| byte[] buffer = new byte[32]; |
| new SecureRandom().nextBytes(buffer); |
| return Base64.getUrlEncoder().withoutPadding().encodeToString(buffer); |
| } |
| |
| /** |
| * Build an URL of a remote Drillbit endpoint. |
| * |
| * @param work {@link WorkManager} instance needed to retrieve the Drillbit address. |
| * @param request {@link HttpServletRequest} instance needed to set the URL schema. |
| * @param hostname hostname of the Drillbit. |
| * @param path relative path to the endpoint. |
| * @return remote Drillbit endpoint URL. |
| * @throws RuntimeException if there is no Drillbit at the given hostname. |
| */ |
| static URL getDrillbitURL(WorkManager work, HttpServletRequest request, String hostname, String path) { |
| int drillbitPort = work.getContext().getAvailableBits().stream() |
| .filter(db -> db.getAddress().equals(hostname)) |
| .findAny() |
| .map(DrillbitEndpoint::getHttpPort) |
| .orElseThrow(() -> new RuntimeException("No such drillbit: " + hostname)); |
| try { |
| return new URL(request.getScheme(), hostname, drillbitPort, path); |
| } catch (MalformedURLException e) { |
| throw new IllegalStateException("Should never occur", e); |
| } |
| } |
| |
| /** |
| * Send an HTTP request and return response body as String. |
| * |
| * @param httpRequest {@link org.apache.http.client.methods.HttpGet} or {@link org.apache.http.client.methods.HttpPost} instance representing an HTTP request. |
| * @param drillConfig {@link DrillConfig} instance needed to setup HTTP Client. |
| * @return String response body. |
| * @throws Exception if unable to create HTTP client or in case of HTTP timeout. |
| */ |
| static String doHTTPRequest(HttpRequestBase httpRequest, DrillConfig drillConfig) throws Exception { |
| CloseableHttpAsyncClient httpClient = getHttpClient(drillConfig); |
| try (BufferedReader reader = new BufferedReader(new InputStreamReader( |
| httpClient.execute(httpRequest, null) |
| .get() |
| .getEntity() |
| .getContent()))) { |
| return reader.lines().collect(Collectors.joining("\n")); |
| } |
| } |
| |
| /** |
| * Get singleton instance of an HTTP Client. |
| * |
| * @param drillConfig {@link DrillConfig} instance needed to retrieve Drill SSL parameters. |
| * @return HTTP Client instance. |
| * @throws Exception if unable to create an HTTP Client. |
| */ |
| private static CloseableHttpAsyncClient getHttpClient(DrillConfig drillConfig) throws Exception { |
| CloseableHttpAsyncClient localHttpClient = httpClient; |
| if (localHttpClient == null) { |
| synchronized (WebUtils.class) { |
| localHttpClient = httpClient; |
| if (httpClient == null) { |
| localHttpClient = createHttpClient(drillConfig); |
| localHttpClient.start(); |
| httpClient = localHttpClient; |
| } |
| } |
| } |
| return localHttpClient; |
| } |
| |
| private static CloseableHttpAsyncClient createHttpClient(DrillConfig drillConfig) throws Exception { |
| HttpAsyncClientBuilder clientBuilder = HttpAsyncClients.custom(); |
| if (drillConfig.getBoolean(ExecConstants.HTTP_ENABLE_SSL)) { |
| SSLContext sslContext = SSLContexts.custom() |
| .loadTrustMaterial(new TrustSelfSignedStrategy()) |
| .build(); |
| SSLIOSessionStrategy sessionStrategy = new SSLIOSessionStrategy( |
| sslContext, |
| new String[]{drillConfig.getString(ExecConstants.SSL_PROTOCOL)}, |
| null, |
| SSLIOSessionStrategy.getDefaultHostnameVerifier() |
| ); |
| clientBuilder.setSSLStrategy(sessionStrategy); |
| } |
| RequestConfig requestConfig = RequestConfig.custom() |
| .setConnectTimeout(drillConfig.getInt(ExecConstants.HTTP_CLIENT_TIMEOUT)) |
| .build(); |
| clientBuilder.setDefaultRequestConfig(requestConfig); |
| return clientBuilder.build(); |
| } |
| } |