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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;
import java.math.BigInteger;
import java.security.MessageDigest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @tuscany.spi.extension.asclient
*
*/
public class HTTPUtils {
/**
* Utility method to set common http headers and other stuff in a
* default http response. Applications / Extensions can then override and
* tweak as they see fit.
*
* @param response
*/
public static void prepareHTTPResponse(HttpServletResponse response) {
response.setDateHeader("Date", System.currentTimeMillis());
}
/**
* Calculate the relative request path taking in consideration if
* the application is running in a embedded webContatiner or from
* within a web application server host environment
*
* @param request The http request
* @return the relative path
*/
public static String getRequestPath(HttpServletRequest request) {
// Get the request path
String contextPath = request.getContextPath();
String servletPath = request.getServletPath();
String requestURI = request.getRequestURI();
int contextPathLength = contextPath.length();
int servletPathLenght = servletPath.contains(contextPath) ? servletPath.length() - contextPath.length() : servletPath.length();
String requestPath = requestURI.substring(contextPathLength + servletPathLenght);
return requestPath;
}
/**
* Calculate the context root for an application taking in consideration if
* the application is running in a embedded webContatiner or from
* within a web application server host environment.
*
* In the case of webContainer the contextRoot will always be a empty string.
*
* @param request The http request
* @return the contextRoot
*/
public static String getContextRoot(HttpServletRequest request) {
// Get the request path
String contextPath = request.getContextPath();
String requestURI = request.getRequestURI();
int contextPathLength = contextPath.length();
String contextRoot = requestURI.substring(0, contextPathLength);
return contextRoot;
}
/**
* Calculate the ETag using MD5 Hash Algorithm
* @param content the content to hash
* @return
*/
public static String calculateHashETag(byte[] content) {
String eTag = "invalid";
try {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
byte[] digest = messageDigest.digest(content);
BigInteger number = new BigInteger(1, digest);
StringBuffer sb = new StringBuffer('0');
sb.append(number.toString(16));
eTag = sb.toString();
} catch(Exception e) {
//ignore, we will return random etag
eTag = Integer.toString((new java.util.Random()).nextInt(Integer.MAX_VALUE));
}
return eTag;
}
}
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