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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2017 Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * 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
 * https://github.com/payara/Payara/blob/master/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * The Payara Foundation designates this particular file as subject to the "Classpath"
 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package fish.payara.microprofile.jwtauth.eesecurity;

import static javax.security.enterprise.identitystore.CredentialValidationResult.Status.VALID;

import javax.enterprise.inject.spi.CDI;
import javax.security.enterprise.AuthenticationException;
import javax.security.enterprise.AuthenticationStatus;
import javax.security.enterprise.authentication.mechanism.http.HttpAuthenticationMechanism;
import javax.security.enterprise.authentication.mechanism.http.HttpMessageContext;
import javax.security.enterprise.identitystore.CredentialValidationResult;
import javax.security.enterprise.identitystore.IdentityStore;
import javax.security.enterprise.identitystore.IdentityStoreHandler;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * This authentication mechanism reads a JWT token from an HTTP header and passes it
 * to an {@link IdentityStore} for validation. 
 * 
 * @author Arjan Tijms
 */
public class JWTAuthenticationMechanism implements HttpAuthenticationMechanism {

    @Override
    public AuthenticationStatus validateRequest(HttpServletRequest request, HttpServletResponse response, HttpMessageContext httpMessageContext) throws AuthenticationException {

        if (httpMessageContext.isProtected()) {
            IdentityStoreHandler identityStoreHandler = CDI.current().select(IdentityStoreHandler.class).get();
            
            SignedJWTCredential credential = getCredential(request);
            
            if (credential != null) {
                
                CredentialValidationResult result = identityStoreHandler.validate(credential);
                if (result.getStatus() == VALID) {
                    httpMessageContext.getClientSubject()
                                      .getPrincipals()
                                      .add(result.getCallerPrincipal());
                }
                
                return httpMessageContext.notifyContainerAboutLogin(result);
            }
        }
        
        return httpMessageContext.doNothing();
    }

    private SignedJWTCredential getCredential(HttpServletRequest request) {

        String authorizationHeader = request.getHeader("Authorization");
        if (authorizationHeader != null && authorizationHeader.startsWith("Bearer ")) {
            String token = authorizationHeader.substring("Bearer ".length());
            if (token != null && !token.isEmpty()) {
                return new SignedJWTCredential(token);
            }
        }

        return null;
    }

}