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/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain.  As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
package android.gov.nist.javax.sip.parser;

import android.gov.nist.core.Token;
import android.gov.nist.javax.sip.header.*;
import java.text.ParseException;

/**
 * Parser for UserAgent header.
 *
 * @version 1.2 $Revision: 1.16 $ $Date: 2010-05-06 14:07:44 $
 *
 * @author Olivier Deruelle  
* @author M. Ranganathan
* * */ public class UserAgentParser extends HeaderParser { /** * Constructor * * @param userAgent - * UserAgent header to parse */ public UserAgentParser(String userAgent) { super(userAgent); } /** * Constructor * * @param lexer - * the lexer to use. */ protected UserAgentParser(Lexer lexer) { super(lexer); } /** * parse the message. Note that we have losened up on the parsing quite a bit because * user agents tend to be very bad about specifying the user agent according to RFC. * * @return SIPHeader (UserAgent object) * @throws SIPParseException * if the message does not respect the spec. */ public SIPHeader parse() throws ParseException { if (debug) dbg_enter("UserAgentParser.parse"); UserAgent userAgent = new UserAgent(); try { headerName(TokenTypes.USER_AGENT); if (this.lexer.lookAhead(0) == '\n') throw createParseException("empty header"); /* * BNF User-Agent = "User-Agent" HCOLON server-val *(LWS server-val) * server-val = product / comment product = token [SLASH * product-version] product-version = token */ while (this.lexer.lookAhead(0) != '\n' && this.lexer.lookAhead(0) != '\0') { if (this.lexer.lookAhead(0) == '(') { String comment = this.lexer.comment(); userAgent.addProductToken('(' + comment + ')'); } else { // product = token [SLASHproduct-version] // product-version = token // The RFC Does NOT allow this space but we are generous in what we accept this.getLexer().SPorHT(); String product = this.lexer.byteStringNoSlash(); if ( product == null ) throw createParseException("Expected product string"); StringBuilder productSb = new StringBuilder(product); // do we possibily have the optional product-version? if (this.lexer.peekNextToken().getTokenType() == TokenTypes.SLASH) { // yes this.lexer.match(TokenTypes.SLASH); // product-version // The RFC Does NOT allow this space but we are generous in what we accept this.getLexer().SPorHT(); String productVersion = this.lexer.byteStringNoSlash(); if ( productVersion == null ) throw createParseException("Expected product version"); productSb.append("/"); productSb.append(productVersion); } userAgent.addProductToken(productSb.toString()); } // LWS this.lexer.SPorHT(); } } finally { if (debug) dbg_leave("UserAgentParser.parse"); } return userAgent; } public static void main(String args[]) throws ParseException { String userAgent[] = { "User-Agent: Softphone/Beta1.5 \n", "User-Agent:Nist/Beta1 (beta version) \n", "User-Agent: Nist UA (beta version)\n", "User-Agent: Nist1.0/Beta2 Ubi/vers.1.0 (very cool) \n" , "User-Agent: SJphone/1.60.299a/L (SJ Labs)\n", "User-Agent: sipXecs/3.5.11 sipXecs/sipxbridge (Linux)\n"}; for (int i = 0; i < userAgent.length; i++ ) { UserAgentParser parser = new UserAgentParser(userAgent[i]); UserAgent ua= (UserAgent) parser.parse(); System.out.println("encoded = " + ua.encode()); } } }




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