ru.mystamps.web.support.spring.security.CustomUserDetailsArgumentResolver.java Source code

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Here is the source code for ru.mystamps.web.support.spring.security.CustomUserDetailsArgumentResolver.java

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/*
 * Copyright (C) 2009-2015 Slava Semushin <slava.semushin@gmail.com>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package ru.mystamps.web.support.spring.security;

import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;

import org.apache.commons.lang3.Validate;

public class CustomUserDetailsArgumentResolver implements HandlerMethodArgumentResolver {

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return isSupportedType(parameter.getParameterType());
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
            NativeWebRequest webRequest, WebDataBinderFactory binderFactory) {

        SecurityContext ctx = SecurityContextHolder.getContext();
        Validate.validState(ctx != null, "Security context must be non null");

        Authentication auth = ctx.getAuthentication();
        if (auth == null) {
            return null;
        }

        Object principal = auth.getPrincipal();
        if (principal == null) {
            return null;
        }

        if (isSupportedType(principal.getClass())) {
            return principal;
        }

        return null;
    }

    private static boolean isSupportedType(Class<?> clazz) {
        return CustomUserDetails.class.isAssignableFrom(clazz);
    }

}