/*
 * Copyright 2015 the original author or authors.
 *
 * 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.springframework.boot.autoconfigure.security.oauth2.client;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.boot.autoconfigure.security.SecurityProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.util.ClassUtils;

/**
 * If the user only has <code>@EnableOAuth2Sso</code> but not on a
 * WebSecurityConfigurerAdapter then one is added with all paths secured and with an order
 * that puts it ahead of the default HTTP Basic security chain in Spring Boot.
 * 
 * @author Dave Syer
 *
 */
@Configuration
@EnableConfigurationProperties(OAuth2SsoProperties.class)
public class OAuth2SsoDefaultConfiguration {

	@Configuration
	@Conditional(NeedsWebSecurityCondition.class)
	protected static class WebSecurityConfiguration extends WebSecurityConfigurerAdapter
			implements Ordered {

		@Autowired
		BeanFactory beanFactory;

		@Autowired
		OAuth2SsoProperties sso;

		@Override
		protected void configure(HttpSecurity http) throws Exception {
			http.antMatcher("/**").authorizeRequests().anyRequest().authenticated();
			new SsoSecurityConfigurer(beanFactory).configure(http);
		}

		@Override
		public int getOrder() {
			if (sso.getFilterOrder() != null) {
				return sso.getFilterOrder();
			}
			if (ClassUtils
					.isPresent(
							"org.springframework.boot.actuate.autoconfigure.ManagementServerProperties",
							null)) {
				// If > BASIC_AUTH_ORDER then the existing rules for the actuator
				// endpoints
				// will take precedence. This value is < BASIC_AUTH_ORDER.
				return SecurityProperties.ACCESS_OVERRIDE_ORDER - 5;
			}
			return SecurityProperties.ACCESS_OVERRIDE_ORDER;
		}

	}

	private static class NeedsWebSecurityCondition extends SpringBootCondition {
		@Override
		public ConditionOutcome getMatchOutcome(ConditionContext context,
				AnnotatedTypeMetadata metadata) {
			String[] enablers = context.getBeanFactory().getBeanNamesForAnnotation(
					EnableOAuth2Sso.class);
			for (String name : enablers) {
				if (context.getBeanFactory().isTypeMatch(name,
						WebSecurityConfigurerAdapter.class)) {
					return ConditionOutcome
							.noMatch("found @EnableOAuth2Sso on a WebSecurityConfigurerAdapter");
				}
			}
			return ConditionOutcome
					.match("found no @EnableOAuth2Sso on a WebSecurityConfigurerAdapter");
		}
	}

}
