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/*
 * ****************************************************************************
 *     Cloud Foundry
 *     Copyright (c) [2009-2017] Pivotal Software, Inc. All Rights Reserved.
 *
 *     This product is licensed to you under the Apache License, Version 2.0 (the "License").
 *     You may not use this product except in compliance with the License.
 *
 *     This product includes a number of subcomponents with
 *     separate copyright notices and license terms. Your use of these
 *     subcomponents is subject to the terms and conditions of the
 *     subcomponent's license, as noted in the LICENSE file.
 * ****************************************************************************
 */

package org.cloudfoundry.identity.uaa.oauth.token;

import org.cloudfoundry.identity.uaa.zone.ClientServicesExtension;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.common.exceptions.InvalidGrantException;
import org.springframework.security.oauth2.provider.ClientDetails;
import org.springframework.security.oauth2.provider.DefaultSecurityContextAccessor;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.OAuth2Request;
import org.springframework.security.oauth2.provider.OAuth2RequestFactory;
import org.springframework.security.oauth2.provider.TokenRequest;
import org.springframework.security.oauth2.provider.token.AbstractTokenGranter;
import org.springframework.security.oauth2.provider.token.AuthorizationServerTokenServices;

import static org.cloudfoundry.identity.uaa.oauth.token.TokenConstants.GRANT_TYPE_JWT_BEARER;

public class JwtTokenGranter extends AbstractTokenGranter {

    protected JwtTokenGranter(AuthorizationServerTokenServices tokenServices,
                              ClientServicesExtension clientDetailsService,
                              OAuth2RequestFactory requestFactory) {
        super(tokenServices, clientDetailsService, requestFactory, GRANT_TYPE_JWT_BEARER);
    }

    protected Authentication validateRequest(TokenRequest request) {
        if (new DefaultSecurityContextAccessor().isUser()) {
            if( request == null ||
                request.getRequestParameters() == null ||
                request.getRequestParameters().isEmpty()) {
                throw new InvalidGrantException("Missing token request object");
            }
            if(request.getRequestParameters().get("grant_type") == null) {
                throw new InvalidGrantException("Missing grant type");
            }
            if(!GRANT_TYPE_JWT_BEARER.equals(request.getRequestParameters().get("grant_type"))) {
                throw new InvalidGrantException("Invalid grant type");
            }
        } else {
            throw new InvalidGrantException("User authentication not found");
        }
        return SecurityContextHolder.getContext().getAuthentication();
    }

    @Override
    protected OAuth2Authentication getOAuth2Authentication(ClientDetails client, TokenRequest tokenRequest) {

        Authentication userAuth = validateRequest(tokenRequest);
        OAuth2Request storedOAuth2Request = getRequestFactory().createOAuth2Request(client, tokenRequest);
        return new OAuth2Authentication(storedOAuth2Request, userAuth);
    }
}