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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import java.io.Serializable;

import javax.annotation.Priority;
import javax.inject.Inject;
import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;

/**
 *
 * @author Loc Ha
 *
 */
@Authorize
@Interceptor
@Priority(Interceptor.Priority.LIBRARY_BEFORE + 150)
public class AuthorizeInterceptor implements Serializable {
	private static final long serialVersionUID = 1L;

	@Inject
	protected AuthContext authContext;

	@Inject
	protected AuthorizePolicyProvider authorizePolicyProvider;

	@AroundInvoke
	public Object intercept(InvocationContext context) throws Exception {

		// Bypass Controller
		if (context.getMethod().getDeclaringClass().getAnnotation(Controller.class) != null) {
			return context.proceed();
		}

		// Authorize
		Authorize authorize = context.getMethod().getAnnotation(Authorize.class);
		if (authorize == null) {
			authorize = context.getMethod().getDeclaringClass().getAnnotation(Authorize.class);
		}
		if ((authorize == null) || authorize.removed()) {
			return context.proceed();
		}

		// UserPrincipal
		UserPrincipal principal = this.authContext.getUserPrincipal();
		if (principal == null) {
			throw new UnauthorizedException();
		}

		String[] roles = authorize.roles();
		String[] policies = authorize.policies();

		if ((roles.length == 0) && (policies.length == 0)) {
			return context.proceed();
		}
		if (roles.length > 0) {
			if (this.authContext.isCallerInRoles(roles)) {
				return context.proceed();
			}
		}
		if (policies.length > 0) {
			if (this.authorizePolicyProvider.authorize(principal, policies)) {
				return context.proceed();
			}
		}
		throw new ForbiddenException();
	}
}