/*******************************************************************************
* Copyright (c) 2002-2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM - Initial API and implementation
*******************************************************************************/
package org.eclipse.wst.wsi.internal.core.util;
import java.util.HashMap;
import java.util.Map;
import com.ibm.icu.util.StringTokenizer;
import org.eclipse.wst.wsi.internal.core.WSIException;
/**
* Set of HTTPL related utilities.
*
* @version 1.0.1
* @author Peter Brittenham
*/
public final class HTTPUtils
{
/**
* Find the URL string in a HTTP POST header.
* @param httpPostHeader a HTTP POST header.
* @return the URL string in a HTTP POST header.
*/
public static String getURLString(String httpPostHeader)
{
String urlString = null;
int start, end;
// If POST, then continue
if (httpPostHeader.startsWith("POST") || httpPostHeader.startsWith("GET"))
{
// Start after first space
start = httpPostHeader.indexOf(' ') + 1;
// Look for next non-space character
while (httpPostHeader.charAt(start) == ' ')
start++;
// Find next space character
end = httpPostHeader.indexOf(' ', start);
// Get URL string which is located in between start and end
urlString = httpPostHeader.substring(start, end);
}
// Else throw exception
else
{
throw new IllegalArgumentException(
"HTTP header does not contain POST data (was: " + httpPostHeader + ")");
}
// Return URL string
return urlString;
}
/**
* Utility to present HTTP header information as attribute-value pairs,
* based on ':' as attribute-value separator.
* @param httpHeaderString an HTTP header string.
* @param separators attribute-value separator list.
* @return HTTP header information as attribute-value pairs.
* @throws WSIException if unable to create HTTP header information
* as attribute-value pairs.
*/
public static Map getHttpHeaderTokens(String httpHeaderString, String separators)
throws WSIException
{
StringTokenizer tokenizer = new StringTokenizer(httpHeaderString, "\n\r\f");
Map map = new HashMap();
String name = null;
while (tokenizer.hasMoreTokens())
{
String line = tokenizer.nextToken();
int index = line.indexOf(separators);
if (index > 0 && index < line.length() - 1)
{
name = line.substring(0, index).toUpperCase();
map.put(name, line.substring(index + 1).trim());
}
else
{
if ((name != null) && (line.length()>0) && Character.isWhitespace(line.charAt(0)))
map.put(name, map.get(name) + " " + line.trim());
}
}
return map;
}
/**
* Utility to take sub attribute value from HTTP header
* @param httpHeaderString an HTTP header string.
* @param attributeName attribute name.
* @param subAttributeName sub attribute name.
* @return sub attribute value from HTTP header.
* @throws WSIException if unable to get sub attribute value from HTTP header.
*/
public static String getHttpHeaderSubAttribute(String httpHeaderString,
String attributeName, String subAttributeName)
throws WSIException
{
// get attribute value
String value =
(String) getHttpHeaderTokens(httpHeaderString,":").get(attributeName.toUpperCase());
if(value != null)
{
// search sub attribute token
int idxQ = value.toUpperCase().indexOf(subAttributeName.toUpperCase()+"=\"");
int idx = value.toUpperCase().indexOf(subAttributeName.toUpperCase()+"=");
// if attribute is quoted
if (idxQ != -1)
{
idxQ += (subAttributeName+"=\"").length();
int eIdxQ = value.indexOf("\"", idxQ);
if (eIdxQ != -1)
{
return value.substring(idxQ, eIdxQ);
}
else
{
return null;
}
}
// if attribute do not quoted
else if (idx != -1)
{
idx += (subAttributeName+"=").length();
int eIdx = -1;
// find end space separator
if ((eIdx = value.indexOf(" ", idx)) != -1)
{
return value.substring(idx, eIdx);
}
// find coma separator
else if ((eIdx = value.indexOf(";", idx)) != -1)
{
return value.substring(idx, eIdx);
}
// this is last attribute
else
{
return value.substring(idx);
}
}
// if attribute do not found
else
{
return null;
}
}
return value;
}
/**
* Utility to take attribute value from HTTP header
* @param httpHeaderString an HTTP header string.
* @param attributeName attribute name.
* @return attribute value from HTTP header.
* @throws WSIException if unable to get attribute value from HTTP header.
*/
public static String getHttpHeaderAttribute(String httpHeaderString,
String attributeName)
throws WSIException
{
String attributeValue =
(String) getHttpHeaderTokens(httpHeaderString,":").get(attributeName.toUpperCase());
// get first token
if((attributeValue != null) && (attributeValue.indexOf(";") != -1)) {
attributeValue = attributeValue.substring(0, attributeValue.indexOf(";"));
}
return attributeValue;
}
}