/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.shiro.samples;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.realm.text.TextConfigurationRealm;
import org.apache.shiro.spring.web.config.DefaultShiroFilterChainDefinition;
import org.apache.shiro.spring.web.config.ShiroFilterChainDefinition;
import org.apache.shiro.subject.Subject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.ResponseStatus;

import java.util.HashMap;
import java.util.Map;

@Configuration
@ControllerAdvice
@SpringBootApplication
public class WebApp {

    private static Logger log = LoggerFactory.getLogger(WebApp.class);

    public static void main(String[] args) {

        SpringApplication.run(WebApp.class, args);
    }

    @ExceptionHandler(AuthorizationException.class)
    @ResponseStatus(HttpStatus.FORBIDDEN)
    public String handleException(AuthorizationException e, Model model) {

        // you could return a 404 here instead (this is how github handles 403, so the user does NOT know there is a
        // resource at that location)
        log.debug("AuthorizationException was thrown", e);

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("status", HttpStatus.FORBIDDEN.value());
        map.put("message", "No message available");
        model.addAttribute("errors", map);

        return "error";
    }

    @Bean
    public Realm realm() {
        TextConfigurationRealm realm = new TextConfigurationRealm();
        realm.setUserDefinitions("joe.coder=password,user\n" + "jill.coder=password,admin");

        realm.setRoleDefinitions("admin=read,write\n" + "user=read");
        realm.setCachingEnabled(true);
        return realm;
    }

    @Bean
    public ShiroFilterChainDefinition shiroFilterChainDefinition() {
        DefaultShiroFilterChainDefinition chainDefinition = new DefaultShiroFilterChainDefinition();
        // need to accept POSTs from the login form
        chainDefinition.addPathDefinition("/login.html", "authc");
        chainDefinition.addPathDefinition("/logout", "logout");
        return chainDefinition;
    }

    @ModelAttribute(name = "subject")
    public Subject subject() {
        return SecurityUtils.getSubject();
    }
}
