Java tutorial
/* * The MIT License * * Copyright 2017 Intuit Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.intuit.karate; import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.FilterOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.charset.Charset; import java.util.List; import java.util.SortedSet; import java.util.TreeSet; import java.util.concurrent.atomic.AtomicInteger; import javax.ws.rs.WebApplicationException; import javax.ws.rs.client.ClientRequestContext; import javax.ws.rs.client.ClientRequestFilter; import javax.ws.rs.client.ClientResponseContext; import javax.ws.rs.client.ClientResponseFilter; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.MultivaluedMap; import javax.ws.rs.ext.WriterInterceptor; import javax.ws.rs.ext.WriterInterceptorContext; import org.apache.commons.io.IOUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * * @author pthomas3 */ public class LoggingFilter implements ClientRequestFilter, ClientResponseFilter, WriterInterceptor { private static final Logger logger = LoggerFactory.getLogger(LoggingFilter.class); private static final String LOGGING_OUTPUT_STREAM_KEY = LoggingFilter.class.getName(); private static final String[] PRINTABLES = { "json", "xml", "text", "urlencoded", "html" }; private static final Charset UTF8 = Charset.forName("UTF-8"); private final AtomicInteger counter = new AtomicInteger(); private static boolean isPrintable(MediaType mediaType) { if (mediaType == null) { return false; } String type = mediaType.toString().toLowerCase(); for (String temp : PRINTABLES) { if (type.contains(temp)) { return true; } } return false; } private static Charset getCharset(MediaType mediaType) { if (mediaType == null) { return UTF8; } String value = mediaType.getParameters().get(MediaType.CHARSET_PARAMETER); return value == null ? UTF8 : Charset.forName(value); } private void logHeaders(StringBuilder sb, int id, char prefix, MultivaluedMap<String, String> headers) { SortedSet<String> keys = new TreeSet(headers.keySet()); for (String key : keys) { List<String> entries = headers.get(key); sb.append(id).append(' ').append(prefix).append(' ').append(key).append(": ") .append(entries.size() == 1 ? entries.get(0) : entries).append('\n'); } } @Override public void filter(ClientRequestContext request) throws IOException { int id = counter.incrementAndGet(); StringBuilder sb = new StringBuilder(); sb.append('\n').append(id).append(" > ").append(request.getMethod()).append(' ') .append(request.getUri().toASCIIString()).append('\n'); logHeaders(sb, id, '>', request.getStringHeaders()); if (request.hasEntity() && isPrintable(request.getMediaType())) { LoggingFilterOutputStream out = new LoggingFilterOutputStream(request.getEntityStream(), sb); request.setEntityStream(out); request.setProperty(LOGGING_OUTPUT_STREAM_KEY, out); } else { logger.debug(sb.toString()); } } @Override public void filter(ClientRequestContext request, ClientResponseContext response) throws IOException { int id = counter.get(); StringBuilder sb = new StringBuilder(); sb.append('\n').append(id).append(" < ").append(response.getStatus()).append('\n'); logHeaders(sb, id, '<', response.getHeaders()); if (response.hasEntity() && isPrintable(response.getMediaType())) { InputStream is = response.getEntityStream(); if (!is.markSupported()) { is = new BufferedInputStream(is); } is.mark(Integer.MAX_VALUE); String buffer = IOUtils.toString(is, getCharset(response.getMediaType())); sb.append(buffer).append('\n'); is.reset(); response.setEntityStream(is); // in case it was swapped } logger.debug(sb.toString()); } @Override public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException { LoggingFilterOutputStream out = (LoggingFilterOutputStream) context.getProperty(LOGGING_OUTPUT_STREAM_KEY); context.proceed(); if (out != null) { StringBuilder sb = out.buffer; sb.append(new String(out.byteStream.toByteArray(), getCharset(context.getMediaType()))).append('\n'); logger.debug(sb.toString()); } } private static class LoggingFilterOutputStream extends FilterOutputStream { protected final ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); protected final StringBuilder buffer; public LoggingFilterOutputStream(OutputStream out, StringBuilder sb) { super(out); this.buffer = sb; } @Override public void write(int b) throws IOException { super.write(b); byteStream.write(b); } } }