/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * 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 cn.vlabs.umt.oauth.as.request;

import javax.servlet.http.HttpServletRequest;

import cn.vlabs.umt.oauth.as.validator.AuthorizationCodeValidator;
import cn.vlabs.umt.oauth.as.validator.ClientCredentialValidator;
import cn.vlabs.umt.oauth.as.validator.PasswordValidator;
import cn.vlabs.umt.oauth.as.validator.RefreshTokenValidator;
import cn.vlabs.umt.oauth.common.OAuth;
import cn.vlabs.umt.oauth.common.exception.OAuthProblemException;
import cn.vlabs.umt.oauth.common.exception.OAuthSystemException;
import cn.vlabs.umt.oauth.common.message.types.GrantType;
import cn.vlabs.umt.oauth.common.utils.OAuthUtils;
import cn.vlabs.umt.oauth.common.validators.OAuthValidator;


/**
 *
 *
 *
 */
public class OAuthTokenRequest extends OAuthRequest {


    public OAuthTokenRequest(HttpServletRequest request) throws OAuthSystemException, OAuthProblemException {
        super(request);
    }

    @Override
    protected OAuthValidator<HttpServletRequest> initValidator() throws OAuthProblemException, OAuthSystemException {
        validators.put(GrantType.PASSWORD.toString(), PasswordValidator.class);
        validators.put(GrantType.CLIENT_CREDENTIALS.toString(), ClientCredentialValidator.class);
        validators.put(GrantType.AUTHORIZATION_CODE.toString(), AuthorizationCodeValidator.class);
        validators.put(GrantType.REFRESH_TOKEN.toString(), RefreshTokenValidator.class);
        String requestTypeValue = getParam(OAuth.OAUTH_GRANT_TYPE);
        if (OAuthUtils.isEmpty(requestTypeValue)) {
            throw OAuthUtils.handleOAuthProblemException("Missing grant_type parameter value");
        }
        Class<? extends OAuthValidator<HttpServletRequest>> clazz = validators.get(requestTypeValue);
        if (clazz == null) {
            throw OAuthUtils.handleOAuthProblemException("Invalid grant_type parameter value");
        }
        return OAuthUtils.instantiateClass(clazz);
    }

    public String getPassword() {
        return getParam(OAuth.OAUTH_PASSWORD);
    }

    public String getUsername() {
        return getParam(OAuth.OAUTH_USERNAME);
    }

    public String getRefreshToken() {
        return getParam(OAuth.OAUTH_REFRESH_TOKEN);
    }
    
    public String getCode() {
        return getParam(OAuth.OAUTH_CODE);
    }

    public String getGrantType() {
        return getParam(OAuth.OAUTH_GRANT_TYPE);
    }

}