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/**
 * Copyright 2013-2014 Guoqiang Chen, Shanghai, China. All rights reserved.
 *
 *   Author: Guoqiang Chen
 *    Email: [email protected]
 *   WebURL: https://github.com/subchen
 *
 * 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 jetbrick.web.mvc.router;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import jetbrick.web.mvc.CORSRequestProcessor;

/**
 * 支持 CORS request 的简单实现.
 */
public final class SimpleCORSRequestProcessor implements CORSRequestProcessor {
    private String allowOrigin = "*";
    private String allowHeaders = null;
    private String allowMethods = null;
    private String maxAge = "3600";
    private boolean allowCredentials = false;

    public void setAllowOrigin(String allowOrigin) {
        this.allowOrigin = allowOrigin;
    }

    public void setAllowMethods(String allowMethods) {
        this.allowMethods = allowMethods;
    }

    public void setAllowHeaders(String allowHeaders) {
        this.allowHeaders = allowHeaders;
    }

    public void setMaxAge(String maxAge) {
        this.maxAge = maxAge;
    }

    public void setAllowCredentials(boolean allowCredentials) {
        this.allowCredentials = allowCredentials;
    }

    @Override
    public void setHeaders(HttpServletRequest request, HttpServletResponse response) {
        response.setHeader("Access-Control-Allow-Origin", allowOrigin);

        if (allowMethods == null) {
            allowMethods = request.getHeader("Access-Control-Request-Method");
        }
        response.setHeader("Access-Control-Allow-Methods", allowMethods);

        if (allowHeaders == null) {
            allowHeaders = request.getHeader("Access-Control-Request-Headers");
        }

        response.setHeader("Access-Control-Max-Age", maxAge);
        response.setHeader("Access-Control-Allow-Headers", allowHeaders);

        if (allowCredentials) {
            response.setHeader("Access-Control-Allow-Credentials", "true");
        }
    }
}