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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.jersey.logging;

import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ws.rs.RuntimeType;
import javax.ws.rs.core.Feature;
import javax.ws.rs.core.FeatureContext;

import org.glassfish.jersey.CommonProperties;

/**
 * This feature enables logging request and/or response on client-side and/or server-side depending
 * on the context's {@link RuntimeType}.
 * 

 * The feature may be register programmatically like other features by calling any of {@link javax.ws.rs.core.Configurable}
 * {@code register(...)} method, i.e. {@link javax.ws.rs.core.Configurable#register(Class)} or by setting any of the
 * configuration property listed bellow.
 * 

 * Common configurable properties applies for both client and server and are following:
 * 

 * 
{@link #LOGGING_FEATURE_LOGGER_NAME}
 * 
{@link #LOGGING_FEATURE_LOGGER_LEVEL}
 * 
{@link #LOGGING_FEATURE_VERBOSITY}
 * 
{@link #LOGGING_FEATURE_MAX_ENTITY_SIZE}
 * 
 * 

 * If any of the configuration value is not set, following default values are applied:
 * 

 * 
logger name: {@code org.glassfish.jersey.logging.LoggingFeature}
 * 
logger level: {@link Level#FINE}
 * 
verbosity: {@link Verbosity#PAYLOAD_TEXT}
 * 
maximum entity size: {@value #DEFAULT_MAX_ENTITY_SIZE}
 * 
 * 

 * Server configurable properties:
 * 

 * 
{@link #LOGGING_FEATURE_LOGGER_NAME_SERVER}
 * 
{@link #LOGGING_FEATURE_LOGGER_LEVEL_SERVER}
 * 
{@link #LOGGING_FEATURE_VERBOSITY_SERVER}
 * 
{@link #LOGGING_FEATURE_MAX_ENTITY_SIZE_SERVER}
 * 
 * Client configurable properties:
 * 

 * 
{@link #LOGGING_FEATURE_LOGGER_NAME_CLIENT}
 * 
{@link #LOGGING_FEATURE_LOGGER_LEVEL_CLIENT}
 * 
{@link #LOGGING_FEATURE_VERBOSITY_CLIENT}
 * 
{@link #LOGGING_FEATURE_MAX_ENTITY_SIZE_CLIENT}
 * 
 *
 * @author Ondrej Kosatka (ondrej.kosatka at oracle.com)
 * @since 2.23
 */
public class LoggingFeature implements Feature {

    /**
     * Default logger name to log request and response messages.
     */
    public static final String DEFAULT_LOGGER_NAME = LoggingFeature.class.getName();
    /**
     * Default logger level which will be used for logging request and response messages.
     */
    public static final String DEFAULT_LOGGER_LEVEL = Level.FINE.getName();
    /**
     * Default maximum entity bytes to be logged.
     */
    public static final int DEFAULT_MAX_ENTITY_SIZE = 8 * 1024;
    /**
     * Default verbosity for entity logging. See {@link Verbosity}.
     */
    public static final Verbosity DEFAULT_VERBOSITY = Verbosity.PAYLOAD_TEXT;

    private static final String LOGGER_NAME_POSTFIX = ".logger.name";
    private static final String LOGGER_LEVEL_POSTFIX = ".logger.level";
    private static final String VERBOSITY_POSTFIX = ".verbosity";
    private static final String MAX_ENTITY_POSTFIX = ".entity.maxSize";
    private static final String LOGGING_FEATURE_COMMON_PREFIX = "jersey.config.logging";
    /**
     * Common logger name property.
     */
    public static final String LOGGING_FEATURE_LOGGER_NAME = LOGGING_FEATURE_COMMON_PREFIX + LOGGER_NAME_POSTFIX;
    /**
     * Common logger level property.
     */
    public static final String LOGGING_FEATURE_LOGGER_LEVEL = LOGGING_FEATURE_COMMON_PREFIX + LOGGER_LEVEL_POSTFIX;
    /**
     * Common property for configuring a verbosity of entity.
     */
    public static final String LOGGING_FEATURE_VERBOSITY = LOGGING_FEATURE_COMMON_PREFIX + VERBOSITY_POSTFIX;
    /**
     * Common property for configuring a maximum number of bytes of entity to be logged.
     */
    public static final String LOGGING_FEATURE_MAX_ENTITY_SIZE = LOGGING_FEATURE_COMMON_PREFIX + MAX_ENTITY_POSTFIX;

    private static final String LOGGING_FEATURE_SERVER_PREFIX = "jersey.config.server.logging";
    /**
     * Server logger name property.
     */
    public static final String LOGGING_FEATURE_LOGGER_NAME_SERVER = LOGGING_FEATURE_SERVER_PREFIX + LOGGER_NAME_POSTFIX;
    /**
     * Server logger level property.
     */
    public static final String LOGGING_FEATURE_LOGGER_LEVEL_SERVER = LOGGING_FEATURE_SERVER_PREFIX + LOGGER_LEVEL_POSTFIX;
    /**
     * Server property for configuring a verbosity of entity.
     */
    public static final String LOGGING_FEATURE_VERBOSITY_SERVER = LOGGING_FEATURE_SERVER_PREFIX + VERBOSITY_POSTFIX;
    /**
     * Server property for configuring a maximum number of bytes of entity to be logged.
     */
    public static final String LOGGING_FEATURE_MAX_ENTITY_SIZE_SERVER = LOGGING_FEATURE_SERVER_PREFIX + MAX_ENTITY_POSTFIX;

    private static final String LOGGING_FEATURE_CLIENT_PREFIX = "jersey.config.client.logging";
    /**
     * Client logger name property.
     */
    public static final String LOGGING_FEATURE_LOGGER_NAME_CLIENT = LOGGING_FEATURE_CLIENT_PREFIX + LOGGER_NAME_POSTFIX;
    /**
     * Client logger level property.
     */
    public static final String LOGGING_FEATURE_LOGGER_LEVEL_CLIENT = LOGGING_FEATURE_CLIENT_PREFIX + LOGGER_LEVEL_POSTFIX;
    /**
     * Client property for configuring a verbosity of entity.
     */
    public static final String LOGGING_FEATURE_VERBOSITY_CLIENT = LOGGING_FEATURE_CLIENT_PREFIX + VERBOSITY_POSTFIX;
    /**
     * Client property for configuring a maximum number of bytes of entity to be logged.
     */
    public static final String LOGGING_FEATURE_MAX_ENTITY_SIZE_CLIENT = LOGGING_FEATURE_CLIENT_PREFIX + MAX_ENTITY_POSTFIX;

    private final Logger filterLogger;
    private final Verbosity verbosity;
    private final Integer maxEntitySize;
    private final Level level;

    /**
     * Creates the feature with default values.
     */
    public LoggingFeature() {
        this(null, null, null, null);
    }

    /**
     * Creates the feature with custom logger.
     *
     * @param logger the logger to log requests and responses.
     */
    public LoggingFeature(Logger logger) {
        this(logger, null, null, null);
    }

    /**
     * Creates the feature with custom logger and verbosity.
     *
     * @param logger    the logger to log requests and responses.
     * @param verbosity verbosity of logged messages. See {@link Verbosity}.
     */
    public LoggingFeature(Logger logger, Verbosity verbosity) {
        this(logger, null, verbosity, null);
    }

    /**
     * Creates the feature with custom logger and maximum number of bytes of entity to log.
     *
     * @param logger        the logger to log requests and responses.
     * @param maxEntitySize maximum number of entity bytes to be logged (and buffered) - if the entity is larger,
     *                      logging filter will print (and buffer in memory) only the specified number of bytes
     *                      and print "...more..." string at the end. Negative values are interpreted as zero.
     */
    public LoggingFeature(Logger logger, Integer maxEntitySize) {
        this(logger, null, DEFAULT_VERBOSITY, maxEntitySize);
    }

    /**
     * Creates the feature with custom logger, it's level, message verbosity and maximum number of bytes of entity to log.
     *
     * @param logger        the logger to log requests and responses.
     * @param level         level on which the messages will be logged.
     * @param verbosity     verbosity of logged messages. See {@link Verbosity}.
     * @param maxEntitySize maximum number of entity bytes to be logged (and buffered) - if the entity is larger,
     *                      logging filter will print (and buffer in memory) only the specified number of bytes
     *                      and print "...more..." string at the end. Negative values are interpreted as zero.
     */
    public LoggingFeature(Logger logger, Level level, Verbosity verbosity, Integer maxEntitySize) {
        this.filterLogger = logger;
        this.level = level;
        this.verbosity = verbosity;
        this.maxEntitySize = maxEntitySize;
    }

    @Override
    public boolean configure(FeatureContext context) {
        boolean enabled = false;

        if (context.getConfiguration().getRuntimeType() == RuntimeType.CLIENT) {
            ClientLoggingFilter clientLoggingFilter = (ClientLoggingFilter) createLoggingFilter(context, RuntimeType.CLIENT);
            context.register(clientLoggingFilter);
            enabled = true;
        }
        if (context.getConfiguration().getRuntimeType() == RuntimeType.SERVER) {
            ServerLoggingFilter serverClientFilter = (ServerLoggingFilter) createLoggingFilter(context, RuntimeType.SERVER);
            context.register(serverClientFilter);
            enabled = true;
        }
        return enabled;
    }

    private LoggingInterceptor createLoggingFilter(FeatureContext context, RuntimeType runtimeType) {
        Map properties = context.getConfiguration().getProperties();
        String filterLoggerName = CommonProperties.getValue(
                properties,
                runtimeType == RuntimeType.SERVER ? LOGGING_FEATURE_LOGGER_NAME_SERVER : LOGGING_FEATURE_LOGGER_NAME_CLIENT,
                CommonProperties.getValue(
                        properties,
                        LOGGING_FEATURE_LOGGER_NAME,
                        DEFAULT_LOGGER_NAME
                ));
        String filterLevel = CommonProperties.getValue(
                properties,
                runtimeType == RuntimeType.SERVER ? LOGGING_FEATURE_LOGGER_LEVEL_SERVER : LOGGING_FEATURE_LOGGER_LEVEL_CLIENT,
                CommonProperties.getValue(
                        context.getConfiguration().getProperties(),
                        LOGGING_FEATURE_LOGGER_LEVEL,
                        DEFAULT_LOGGER_LEVEL));
        Verbosity filterVerbosity = CommonProperties.getValue(
                properties,
                runtimeType == RuntimeType.SERVER ? LOGGING_FEATURE_VERBOSITY_SERVER : LOGGING_FEATURE_VERBOSITY_CLIENT,
                CommonProperties.getValue(
                        properties,
                        LOGGING_FEATURE_VERBOSITY,
                        DEFAULT_VERBOSITY
                ));
        int filterMaxEntitySize = CommonProperties.getValue(
                properties,
                runtimeType == RuntimeType.SERVER ? LOGGING_FEATURE_MAX_ENTITY_SIZE_SERVER
                        : LOGGING_FEATURE_MAX_ENTITY_SIZE_CLIENT,
                CommonProperties.getValue(
                        properties,
                        LOGGING_FEATURE_MAX_ENTITY_SIZE,
                        DEFAULT_MAX_ENTITY_SIZE
                ));

        Level loggerLevel = Level.parse(filterLevel);

        if (runtimeType == RuntimeType.SERVER) {
            return new ServerLoggingFilter(filterLogger != null ? filterLogger : Logger.getLogger(filterLoggerName),
                    level != null ? level : loggerLevel,
                    verbosity != null ? verbosity : filterVerbosity,
                    maxEntitySize != null ? maxEntitySize : filterMaxEntitySize);
        } else {
            return new ClientLoggingFilter(filterLogger != null ? filterLogger : Logger.getLogger(filterLoggerName),
                    level != null ? level : loggerLevel,
                    verbosity != null ? verbosity : filterVerbosity,
                    maxEntitySize != null ? maxEntitySize : filterMaxEntitySize);
        }
    }

    /**
     * {@code Verbosity} determines how detailed message will be logged.
     * 

     * 

     * 
The lowest verbosity ({@link #HEADERS_ONLY}) will log only request/response headers.
     * 

     * The medium verbosity will log request/response headers, as well as an entity if considered a readable text. See {@link
     * #PAYLOAD_TEXT}.
     * 
     * 
The highest verbosity will log all types of an entity (besides the request/response headers.
     * 
     * 

     * Note that the entity is logged up to the maximum number specified in any of the following constructors {@link
     * LoggingFeature#LoggingFeature(Logger, Integer)}, {@link LoggingFeature#LoggingFeature(Logger, Level, Verbosity, Integer)}
     * or by some of the feature's properties (see {@link #LOGGING_FEATURE_MAX_ENTITY_SIZE}, {@link
     * #LOGGING_FEATURE_MAX_ENTITY_SIZE_CLIENT}, {@link #LOGGING_FEATURE_MAX_ENTITY_SIZE_SERVER}.
     */
    public enum Verbosity {
        /**
         * Only content of HTTP headers is logged. No message payload data are logged.
         */
        HEADERS_ONLY,
        /**
         * Content of HTTP headers as well as entity content of textual media types is logged. Following is the list of media
         * types that are considered textual for the logging purposes:
         * 

         * 
{@code text/*}
         * 
{@code application/atom+xml}
         * 
{@code application/json}
         * 
{@code application/svg+xml}
         * 
{@code application/x-www-form-urlencoded}
         * 
{@code application/xhtml+xml}
         * 
{@code application/xml}
         * 
         */
        PAYLOAD_TEXT,
        /**
         * Full verbose logging. Content of HTTP headers as well as any message payload content will be logged.
         */
        PAYLOAD_ANY
    }
}