com.tikal.tallerWeb.rest.util.CustomRestErrorHandler.java Source code

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Here is the source code for com.tikal.tallerWeb.rest.util.CustomRestErrorHandler.java

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/**
 *   Copyright 2015 TIKAL-TECHNOLOGY
 *
 *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.tikal.tallerWeb.rest.util;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.UnknownHttpStatusCodeException;

import com.tikal.tallerWeb.control.LoginController;
import com.tikal.tallerWeb.control.StartupController;

/**
 *
 * @author Nekorp
 */
@Component
public class CustomRestErrorHandler extends DefaultResponseErrorHandler implements StartupController {

    @Autowired
    private LoginController loginController;

    private HttpStatus getHttpStatusCode(ClientHttpResponse response) throws IOException {
        HttpStatus statusCode;
        try {
            statusCode = response.getStatusCode();
        } catch (IllegalArgumentException ex) {
            throw new UnknownHttpStatusCodeException(response.getRawStatusCode(), response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        }
        return statusCode;
    }

    private byte[] getResponseBody(ClientHttpResponse response) {
        try {
            InputStream responseBody = response.getBody();
            if (responseBody != null) {
                return FileCopyUtils.copyToByteArray(responseBody);
            }
        } catch (IOException ex) {
            // ignore
        }
        return new byte[0];
    }

    private Charset getCharset(ClientHttpResponse response) {
        HttpHeaders headers = response.getHeaders();
        MediaType contentType = headers.getContentType();
        return contentType != null ? contentType.getCharSet() : null;
    }

    @Override
    public void handleError(ClientHttpResponse response) throws IOException {
        HttpStatus statusCode = getHttpStatusCode(response);
        if (statusCode == HttpStatus.UNAUTHORIZED) {
            loginController.start(this);
        } else {
            super.handleError(response);
        }
    }

    @Override
    public void startup() {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void afterLogin() {
        loginController.finish();
    }
}