com.kite9.k9server.LoggingInterceptor.java Source code

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Here is the source code for com.kite9.k9server.LoggingInterceptor.java

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/*
 * Licensed 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 com.kite9.k9server;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Optional;

import org.apache.commons.logging.Log;
import org.springframework.http.HttpMessage;
import org.springframework.http.HttpRequest;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;

import static java.nio.charset.StandardCharsets.ISO_8859_1;

import static org.springframework.util.StreamUtils.copyToString;

/**
 * {@code ClientHttpRequestInterceptor} that logs request and response bodies.
 */
public class LoggingInterceptor implements ClientHttpRequestInterceptor {
    // ----------------------------------------------------------------------------------------------------------------
    // constants
    // ----------------------------------------------------------------------------------------------------------------

    private static final Charset DEFAULT_CHARSET = ISO_8859_1;

    // ----------------------------------------------------------------------------------------------------------------
    // fields
    // ----------------------------------------------------------------------------------------------------------------

    private final Log log;

    // ----------------------------------------------------------------------------------------------------------------
    // constructors
    // ----------------------------------------------------------------------------------------------------------------

    public LoggingInterceptor(Log log) {
        this.log = log;
    }

    // ----------------------------------------------------------------------------------------------------------------
    // ClientHttpRequestInterceptor methods
    // ----------------------------------------------------------------------------------------------------------------

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution)
            throws IOException {
        if (log.isDebugEnabled()) {
            log.debug(String.format("Request: %s %s %s", request.getMethod(), request.getURI(),
                    new String(body, getCharset(request))));
        }

        ClientHttpResponse response = execution.execute(request, body);

        if (log.isDebugEnabled()) {
            log.debug(String.format("Response: %s %s", response.getStatusCode().value(),
                    copyToString(response.getBody(), getCharset(response))));
        }

        return response;
    }

    // ----------------------------------------------------------------------------------------------------------------
    // private methods
    // ----------------------------------------------------------------------------------------------------------------

    private static Charset getCharset(HttpMessage message) {
        return Optional.ofNullable(message.getHeaders().getContentType()).map(MediaType::getCharset)
                .orElse(DEFAULT_CHARSET);
    }
}