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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tuscany.sca.common.http.cors;
import java.io.IOException;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CORSHeaderProcessor {
public static void processCORS(CORSConfiguration config, HttpServletRequest request, HttpServletResponse response)
throws IOException {
if (config == null) {
String allowHeaders = request.getHeader("Access-Control-Request-Headers");
if (allowHeaders == null) {
allowHeaders = "Content-Type, Accept, Origin, X-Requested-With";
}
String allowMethods = request.getHeader("Access-Control-Request-Method");
if (allowMethods == null) {
allowHeaders = "OPTIONS, HEAD, GET, POST, PUT, DELETE";
}
String allowOrigins = request.getHeader("Origin");
if (allowOrigins == null) {
allowOrigins = "*";
}
response.setHeader("Access-Control-Allow-Origin", allowOrigins);
response.setHeader("Access-Control-Allow-Headers", allowHeaders);
response.setHeader("Access-Control-Allow-Credentials", "true");
if ("OPTIONS".equalsIgnoreCase(request.getMethod())) {
response.setHeader("Access-Control-Allow-Methods", allowMethods);
response.setHeader("Access-Control-Max-Age", "1728000");
}
return;
}
if (config.isAllowCredentials()) {
response.setHeader("Access-Control-Allow-Credentials", "true");
}
if (config.getMaxAge() > 0) {
response.setHeader("Access-Control-Max-Age", Integer.toString(config.getMaxAge()));
}
response.setHeader("Access-Control-Allow-Origin", getAllowOrigins(config, request));
response.setHeader("Access-Control-Allow-Methods", getAllowMethods(config));
response.setHeader("Access-Control-Allow-Headers", getAllowHeaders(config));
response.setHeader("Access-Control-Expose-Headers", getExposeHeaders(config));
}
private static String getAllowOrigins(CORSConfiguration config, HttpServletRequest request) {
String allowOrigins = request.getHeader("Origin");
if (allowOrigins == null) {
allowOrigins = "*";
}
return getListValues(config.getAllowOrigins(), allowOrigins);
}
private static String getAllowMethods(CORSConfiguration config) {
return getListValues(config.getAllowMethods(), "OPTIONS, HEAD, GET, POST, PUT, DELETE");
}
private static String getAllowHeaders(CORSConfiguration config) {
return getListValues(config.getAllowHeaders(), "X-Requested-With, Content-Type, Accept, Origin");
}
private static String getExposeHeaders(CORSConfiguration config) {
return getListValues(config.getExposeHeaders(), "X-Requested-With, Content-Type");
}
private static String getListValues(List<String> list, String defaultValue) {
StringBuffer values = new StringBuffer();
if (list != null && list.isEmpty() == false) {
for (String value : list) {
values.append(value).append(",");
}
values.deleteCharAt(values.length());
} else {
values.append(defaultValue);
}
return values.toString();
}
}
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