de.thm.arsnova.web.DeprecatedApiInterceptorHandler.java Source code

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Here is the source code for de.thm.arsnova.web.DeprecatedApiInterceptorHandler.java

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/*
 * This file is part of ARSnova Backend.
 * Copyright (C) 2012-2015 The ARSnova Team
 *
 * ARSnova Backend is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ARSnova Backend is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.thm.arsnova.web;

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

import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

@Component
public class DeprecatedApiInterceptorHandler extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(final HttpServletRequest request, final HttpServletResponse response,
            final Object handler) throws Exception {

        if (getDeprecatedApiAnnotation(handler) != null) {
            response.addHeader("X-Deprecated-Api", "1");
        }

        return super.preHandle(request, response, handler);
    }

    private DeprecatedApi getDeprecatedApiAnnotation(final Object handler) {
        if (!(handler instanceof HandlerMethod)) {
            return null;
        }

        final HandlerMethod handlerMethod = (HandlerMethod) handler;
        return handlerMethod.getMethodAnnotation(DeprecatedApi.class);
    }
}