org.jutge.joc.porra.recaptcha.interceptor.ReCaptchaInterceptor.java Source code

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Here is the source code for org.jutge.joc.porra.recaptcha.interceptor.ReCaptchaInterceptor.java

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/*
 * =============================================================================
 *
 *   Copyright (c) 2013, The porra-joc-jutge team (http://porra.jutge.org)
 *
 *   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 org.jutge.joc.porra.recaptcha.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.tanesha.recaptcha.ReCaptchaImpl;
import net.tanesha.recaptcha.ReCaptchaResponse;

import org.jutge.joc.porra.recaptcha.annotation.ReCaptchaConsumer;
import org.jutge.joc.porra.utils.ReCaptchaUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 * Validates the captcha before the controller method's called. 
 * Will leave a boolean flag in the request with the validation's outcome
 * @author Llop
 */
public class ReCaptchaInterceptor extends HandlerInterceptorAdapter {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public boolean preHandle(final HttpServletRequest request, final HttpServletResponse response,
            final Object handler) throws Exception {
        this.logger.info("ReCaptchaInterceptor.preHandle");
        final ReCaptchaConsumer annotation = ReCaptchaInterceptor.getReCaptchaConsumerAnnotation(handler);
        if (annotation != null) {
            final String recaptchaResponse = request.getParameter(ReCaptchaUtils.RECAPTCHA_RESPONSE_FIELD);
            final String recaptchaChallenge = request.getParameter(ReCaptchaUtils.RECAPTCHA_CHALLENGE_FIELD);
            final String remoteAddr = request.getRemoteAddr();
            final ReCaptchaImpl reCaptcha = new ReCaptchaImpl();
            reCaptcha.setPrivateKey("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
            final ReCaptchaResponse reCaptchaResponse = reCaptcha.checkAnswer(remoteAddr, recaptchaChallenge,
                    recaptchaResponse);
            request.setAttribute(ReCaptchaUtils.RECAPTCHA_IS_VALID, reCaptchaResponse.isValid());
        }
        return true;
    }

    private static ReCaptchaConsumer getReCaptchaConsumerAnnotation(final Object handler) {
        if (handler instanceof HandlerMethod) {
            final HandlerMethod handlerMethod = (HandlerMethod) handler;
            return handlerMethod.getMethodAnnotation(ReCaptchaConsumer.class);
        }
        return null;
    }

}