/*
 * Copyright (c) 2016, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.logging;

import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ws.rs.ConstrainedTo;
import javax.ws.rs.RuntimeType;
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.container.PreMatching;
import javax.ws.rs.core.FeatureContext;

import javax.annotation.Priority;

import org.glassfish.jersey.logging.LoggingFeature.Verbosity;
import org.glassfish.jersey.message.MessageUtils;

Client filter logs requests and responses to specified logger, at required level, with entity or not.
 The filter is registered in LoggingFeature.configure(FeatureContext) and can be used on client side only. The priority is set to the minimum value, which means that filter is called as the last filter when request is sent and similarly as the first filter when the response is received, so request and response is logged as sent or as received. 
Author:
Pavel Bucek, Martin Matula, Ondrej Kosatka/**
 * Client filter logs requests and responses to specified logger, at required level, with entity or not.
 * <p>
 * The filter is registered in {@link LoggingFeature#configure(FeatureContext)} and can be used on client side only. The priority
 * is set to the minimum value, which means that filter is called as the last filter when request is sent and similarly as the
 * first filter when the response is received, so request and response is logged as sent or as received.
 *
 * @author Pavel Bucek
 * @author Martin Matula
 * @author Ondrej Kosatka
 */
@ConstrainedTo(RuntimeType.CLIENT)
@PreMatching
@Priority(Integer.MAX_VALUE)
@SuppressWarnings("ClassWithMultipleLoggers")
final class ClientLoggingFilter extends LoggingInterceptor implements ClientRequestFilter, ClientResponseFilter {

    
Create a logging filter with custom logger and custom settings of entity
logging.
Params:
logger –        the logger to log messages to.
level –         level at which the messages will be logged.
verbosity –  verbosity of the logged messages. See Verbosity.
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./**
     * Create a logging filter with custom logger and custom settings of entity
     * logging.
     *
     * @param logger        the logger to log messages to.
     * @param level         level at which the messages will be logged.
     * @param verbosity     verbosity of the 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 ClientLoggingFilter(final Logger logger, final Level level, final Verbosity verbosity, final int maxEntitySize) {
        super(logger, level, verbosity, maxEntitySize);
    }

    @Override
    public void filter(final ClientRequestContext context) throws IOException {
        if (!logger.isLoggable(level)) {
            return;
        }
        final long id = _id.incrementAndGet();
        context.setProperty(LOGGING_ID_PROPERTY, id);

        final StringBuilder b = new StringBuilder();

        printRequestLine(b, "Sending client request", id, context.getMethod(), context.getUri());
        printPrefixedHeaders(b, id, REQUEST_PREFIX, context.getStringHeaders());

        if (context.hasEntity() && printEntity(verbosity, context.getMediaType())) {
            final OutputStream stream = new LoggingStream(b, context.getEntityStream());
            context.setEntityStream(stream);
            context.setProperty(ENTITY_LOGGER_PROPERTY, stream);
            // not calling log(b) here - it will be called by the interceptor
        } else {
            log(b);
        }
    }

    @Override
    public void filter(final ClientRequestContext requestContext, final ClientResponseContext responseContext)
            throws IOException {
        if (!logger.isLoggable(level)) {
            return;
        }
        final Object requestId = requestContext.getProperty(LOGGING_ID_PROPERTY);
        final long id = requestId != null ? (Long) requestId : _id.incrementAndGet();

        final StringBuilder b = new StringBuilder();

        printResponseLine(b, "Client response received", id, responseContext.getStatus());
        printPrefixedHeaders(b, id, RESPONSE_PREFIX, responseContext.getHeaders());

        if (responseContext.hasEntity() && printEntity(verbosity, responseContext.getMediaType())) {
            responseContext.setEntityStream(logInboundEntity(b, responseContext.getEntityStream(),
                    MessageUtils.getCharset(responseContext.getMediaType())));
        }

        log(b);
    }
}