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package org.loom.addons.recaptcha;

import org.loom.interceptor.PopulateInterceptor;
import org.loom.mapping.ParsedAction;
import org.loom.resolution.Resolution;
import org.loom.servlet.LoomServletRequest;

/**
 * Validates the Captcha. Queries the ReCaptcha service and adds a validation error message if 
 * the captcha value is not correct. 
 * 
 * @author icoloma
 */
public class RecaptchaInterceptor implements PopulateInterceptor {

	private RecaptchaService service;
	
	public Resolution beforePopulate(ParsedAction action) {
		LoomServletRequest request = action.getRequest();
		String challenge = request.getStringParameter(RecaptchaTag.CHALLENGE_PARAM);
		String response = request.getStringParameter(RecaptchaTag.RESPONSE_PARAM);
		request.getRequestParameters().setAssigned(RecaptchaTag.CHALLENGE_PARAM);
		request.getRequestParameters().setAssigned(RecaptchaTag.RESPONSE_PARAM);
		
		String messageKey = service.validate(request.getRemoteAddr(), challenge, response);
		if (messageKey != null) {
			request.setAttribute(RecaptchaTag.RECAPTCHA_ERROR_MESSAGE, messageKey);
			request.getParsedAction().getMessages().error("captcha.error.incorrect");
		}
		return null;
	}
	
	public void setRecaptchaService(RecaptchaService captchaService) {
		this.service = captchaService;
	}
	
}