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/*
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 * Copyright (c) 2015-2017 Oracle and/or its affiliates. All rights reserved.
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
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 *
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 * file and include the License file at LICENSE.txt.
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package org.glassfish.soteria.mechanisms;

import static org.glassfish.soteria.Utils.notNull;

import javax.enterprise.inject.Typed;
import javax.enterprise.inject.spi.CDI;
import javax.security.enterprise.AuthenticationException;
import javax.security.enterprise.AuthenticationStatus;
import javax.security.enterprise.authentication.mechanism.http.AutoApplySession;
import javax.security.enterprise.authentication.mechanism.http.HttpAuthenticationMechanism;
import javax.security.enterprise.authentication.mechanism.http.HttpMessageContext;
import javax.security.enterprise.authentication.mechanism.http.LoginToContinue;
import javax.security.enterprise.credential.Password;
import javax.security.enterprise.credential.UsernamePasswordCredential;
import javax.security.enterprise.identitystore.IdentityStoreHandler;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * Authentication mechanism that authenticates according to the Servlet spec defined FORM
 * authentication mechanism. See Servlet spec for further details.
 * 
 * @author Arjan Tijms
 *
 */
@AutoApplySession // For "is user already logged-in"
@LoginToContinue  // Redirects to form page if protected resource and not-logged in
@Typed(FormAuthenticationMechanism.class) // Omit HttpAuthenticationMechanism type so it won't qualify directly as mechanism
public class FormAuthenticationMechanism implements HttpAuthenticationMechanism, LoginToContinueHolder {
	
    private LoginToContinue loginToContinue;
    
	@Override
	public AuthenticationStatus validateRequest(HttpServletRequest request, HttpServletResponse response, HttpMessageContext httpMessageContext) throws AuthenticationException {
		
	    if (isValidFormPostback(request)) {

            IdentityStoreHandler identityStoreHandler = CDI.current().select(IdentityStoreHandler.class).get();
	        
            return httpMessageContext.notifyContainerAboutLogin(
                    identityStoreHandler.validate(
                    new UsernamePasswordCredential(
                        request.getParameter("j_username"), 
                        new Password(request.getParameter("j_password")))));
	    }
		
		return httpMessageContext.doNothing();
	}
	
	private static boolean isValidFormPostback(HttpServletRequest request) {
	    return 
            "POST".equals(request.getMethod()) &&
            request.getRequestURI().endsWith("/j_security_check") &&
            notNull(request.getParameter("j_username"), request.getParameter("j_password"));
	}
	
    public LoginToContinue getLoginToContinue() {
        return loginToContinue;
    }

    public void setLoginToContinue(LoginToContinue loginToContinue) {
        this.loginToContinue = loginToContinue;
    }
    
    public FormAuthenticationMechanism loginToContinue(LoginToContinue loginToContinue) {
        setLoginToContinue(loginToContinue);
        return this;
    }

}