package com.genersoft.iot.vmp.gb28181.bean;
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import gov.nist.core.CommonLogger;
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import gov.nist.core.Host;
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import gov.nist.core.HostNameParser;
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import gov.nist.core.StackLogger;
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import gov.nist.javax.sip.SIPConstants;
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import gov.nist.javax.sip.address.AddressImpl;
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import gov.nist.javax.sip.address.GenericURI;
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import gov.nist.javax.sip.address.SipUri;
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import gov.nist.javax.sip.address.TelephoneNumber;
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import gov.nist.javax.sip.header.*;
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import gov.nist.javax.sip.message.SIPMessage;
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import gov.nist.javax.sip.message.SIPRequest;
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import gov.nist.javax.sip.message.SIPResponse;
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import gov.nist.javax.sip.parser.*;
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import java.io.UnsupportedEncodingException;
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import java.text.ParseException;
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public class GBStringMsgParser implements MessageParser {
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protected static boolean computeContentLengthFromMessage = false;
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private static StackLogger logger = CommonLogger.getLogger(StringMsgParser.class);
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/**
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* @since v0.9
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*/
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public GBStringMsgParser() {
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super();
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}
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/**
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* Parse a buffer containing a single SIP Message where the body is an array
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* of un-interpreted bytes. This is intended for parsing the message from a
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* memory buffer when the buffer. Incorporates a bug fix for a bug that was
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* noted by Will Sullin of Callcast
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*
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* @param msgBuffer
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* a byte buffer containing the messages to be parsed. This can
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* consist of multiple SIP Messages concatenated together.
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* @return a SIPMessage[] structure (request or response) containing the
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* parsed SIP message.
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* @exception ParseException
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* is thrown when an illegal message has been encountered
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* (and the rest of the buffer is discarded).
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* @see ParseExceptionListener
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*/
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public SIPMessage parseSIPMessage(byte[] msgBuffer, boolean readBody, boolean strict, ParseExceptionListener parseExceptionListener) throws ParseException {
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if (msgBuffer == null || msgBuffer.length == 0)
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return null;
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int i = 0;
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// Squeeze out any leading control character.
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try {
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while (msgBuffer[i] < 0x20)
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i++;
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}
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catch (ArrayIndexOutOfBoundsException e) {
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// Array contains only control char, return null.
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if (logger.isLoggingEnabled(StackLogger.TRACE_DEBUG)) {
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logger.logDebug("handled only control char so returning null");
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}
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return null;
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}
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// Iterate thru the request/status line and headers.
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String currentLine = null;
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String currentHeader = null;
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boolean isFirstLine = true;
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SIPMessage message = null;
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do
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{
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int lineStart = i;
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// Find the length of the line.
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try {
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while (msgBuffer[i] != '\r' && msgBuffer[i] != '\n')
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i++;
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}
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catch (ArrayIndexOutOfBoundsException e) {
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// End of the message.
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break;
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}
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int lineLength = i - lineStart;
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// Make it a String.
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try {
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currentLine = new String(msgBuffer, lineStart, lineLength, "UTF-8");
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} catch (UnsupportedEncodingException e) {
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throw new ParseException("Bad message encoding!", 0);
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}
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currentLine = trimEndOfLine(currentLine);
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if (currentLine.length() == 0) {
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// Last header line, process the previous buffered header.
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if (currentHeader != null && message != null) {
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processHeader(currentHeader, message, parseExceptionListener, msgBuffer);
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}
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}
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else {
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if (isFirstLine) {
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message = processFirstLine(currentLine, parseExceptionListener, msgBuffer);
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} else {
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char firstChar = currentLine.charAt(0);
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if (firstChar == '\t' || firstChar == ' ') {
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if (currentHeader == null)
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throw new ParseException("Bad header continuation.", 0);
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// This is a continuation, append it to the previous line.
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currentHeader += currentLine.substring(1);
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}
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else {
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if (currentHeader != null && message != null) {
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processHeader(currentHeader, message, parseExceptionListener, msgBuffer);
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}
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currentHeader = currentLine;
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}
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}
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}
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if (msgBuffer[i] == '\r' && msgBuffer.length > i+1 && msgBuffer[i+1] == '\n')
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i++;
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i++;
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isFirstLine = false;
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} while (currentLine.length() > 0); // End do - while
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if (message == null) throw new ParseException("Bad message", 0);
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message.setSize(i);
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// Check for content legth header
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if (readBody && message.getContentLength() != null ) {
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if ( message.getContentLength().getContentLength() != 0) {
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int bodyLength = msgBuffer.length - i;
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byte[] body = new byte[bodyLength];
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System.arraycopy(msgBuffer, i, body, 0, bodyLength);
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message.setMessageContent(body,!strict,computeContentLengthFromMessage,message.getContentLength().getContentLength());
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} else if (message.getCSeqHeader().getMethod().equalsIgnoreCase("MESSAGE")) {
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int bodyLength = msgBuffer.length - i;
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byte[] body = new byte[bodyLength];
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System.arraycopy(msgBuffer, i, body, 0, bodyLength);
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message.setMessageContent(body,!strict,computeContentLengthFromMessage,bodyLength);
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}else if (!computeContentLengthFromMessage && strict) {
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String last4Chars = new String(msgBuffer, msgBuffer.length - 4, 4);
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if(!"\r\n\r\n".equals(last4Chars)) {
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throw new ParseException("Extraneous characters at the end of the message ",i);
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}
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}
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}
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return message;
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}
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protected static String trimEndOfLine(String line) {
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if (line == null)
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return line;
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int i = line.length() - 1;
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while (i >= 0 && line.charAt(i) <= 0x20)
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i--;
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if (i == line.length() - 1)
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return line;
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if (i == -1)
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return "";
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return line.substring(0, i+1);
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}
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protected SIPMessage processFirstLine(String firstLine, ParseExceptionListener parseExceptionListener, byte[] msgBuffer) throws ParseException {
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SIPMessage message;
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if (!firstLine.startsWith(SIPConstants.SIP_VERSION_STRING)) {
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message = new SIPRequest();
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try {
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RequestLine requestLine = new RequestLineParser(firstLine + "\n")
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.parse();
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((SIPRequest) message).setRequestLine(requestLine);
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} catch (ParseException ex) {
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if (parseExceptionListener != null)
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try {
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parseExceptionListener.handleException(ex, message,
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RequestLine.class, firstLine, new String(msgBuffer, "UTF-8"));
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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else
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throw ex;
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}
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} else {
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message = new SIPResponse();
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try {
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StatusLine sl = new StatusLineParser(firstLine + "\n").parse();
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((SIPResponse) message).setStatusLine(sl);
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} catch (ParseException ex) {
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if (parseExceptionListener != null) {
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try {
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parseExceptionListener.handleException(ex, message,
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StatusLine.class, firstLine, new String(msgBuffer, "UTF-8"));
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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} else
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throw ex;
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}
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}
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return message;
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}
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protected void processHeader(String header, SIPMessage message, ParseExceptionListener parseExceptionListener, byte[] rawMessage) throws ParseException {
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if (header == null || header.length() == 0)
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return;
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HeaderParser headerParser = null;
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try {
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headerParser = ParserFactory.createParser(header + "\n");
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} catch (ParseException ex) {
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// https://java.net/jira/browse/JSIP-456
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if (parseExceptionListener != null) {
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parseExceptionListener.handleException(ex, message, null,
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header, null);
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return;
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} else {
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throw ex;
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}
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}
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try {
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SIPHeader sipHeader = headerParser.parse();
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message.attachHeader(sipHeader, false);
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} catch (ParseException ex) {
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if (parseExceptionListener != null) {
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String headerName = Lexer.getHeaderName(header);
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Class headerClass = NameMap.getClassFromName(headerName);
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if (headerClass == null) {
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headerClass = ExtensionHeaderImpl.class;
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}
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try {
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parseExceptionListener.handleException(ex, message,
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headerClass, header, new String(rawMessage, "UTF-8"));
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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}
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}
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}
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/**
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* Parse an address (nameaddr or address spec) and return and address
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* structure.
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*
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* @param address
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* is a String containing the address to be parsed.
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* @return a parsed address structure.
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* @since v1.0
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* @exception ParseException
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* when the address is badly formatted.
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*/
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public AddressImpl parseAddress(String address) throws ParseException {
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AddressParser addressParser = new AddressParser(address);
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return addressParser.address(true);
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}
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/**
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* Parse a host:port and return a parsed structure.
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*
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* @param hostport
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* is a String containing the host:port to be parsed
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* @return a parsed address structure.
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* @since v1.0
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* @exception throws
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* a ParseException when the address is badly formatted.
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*
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public HostPort parseHostPort(String hostport) throws ParseException {
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Lexer lexer = new Lexer("charLexer", hostport);
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return new HostNameParser(lexer).hostPort();
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}
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*/
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/**
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* Parse a host name and return a parsed structure.
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*
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* @param host
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* is a String containing the host name to be parsed
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* @return a parsed address structure.
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* @since v1.0
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* @exception ParseException
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* a ParseException when the hostname is badly formatted.
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*/
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public Host parseHost(String host) throws ParseException {
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Lexer lexer = new Lexer("charLexer", host);
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return new HostNameParser(lexer).host();
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}
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/**
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* Parse a telephone number return a parsed structure.
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*
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* @param telephone_number
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* is a String containing the telephone # to be parsed
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* @return a parsed address structure.
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* @since v1.0
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* @exception ParseException
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* a ParseException when the address is badly formatted.
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*/
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public TelephoneNumber parseTelephoneNumber(String telephone_number)
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throws ParseException {
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// Bug fix contributed by Will Scullin
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return new URLParser(telephone_number).parseTelephoneNumber(true);
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}
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/**
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* Parse a SIP url from a string and return a URI structure for it.
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*
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* @param url
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* a String containing the URI structure to be parsed.
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* @return A parsed URI structure
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* @exception ParseException
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* if there was an error parsing the message.
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*/
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public SipUri parseSIPUrl(String url) throws ParseException {
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try {
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return new URLParser(url).sipURL(true);
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} catch (ClassCastException ex) {
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throw new ParseException(url + " Not a SIP URL ", 0);
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}
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}
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/**
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* Parse a uri from a string and return a URI structure for it.
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*
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* @param url
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* a String containing the URI structure to be parsed.
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* @return A parsed URI structure
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* @exception ParseException
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* if there was an error parsing the message.
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*/
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public GenericURI parseUrl(String url) throws ParseException {
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return new URLParser(url).parse();
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}
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/**
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* Parse an individual SIP message header from a string.
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*
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* @param header
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* String containing the SIP header.
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* @return a SIPHeader structure.
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* @exception ParseException
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* if there was an error parsing the message.
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*/
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public static SIPHeader parseSIPHeader(String header) throws ParseException {
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int start = 0;
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int end = header.length() - 1;
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try {
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// Squeeze out any leading control character.
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while (header.charAt(start) <= 0x20)
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start++;
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// Squeeze out any trailing control character.
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while (header.charAt(end) <= 0x20)
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end--;
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}
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catch (ArrayIndexOutOfBoundsException e) {
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// Array contains only control char.
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throw new ParseException("Empty header.", 0);
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}
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StringBuilder buffer = new StringBuilder(end + 1);
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int i = start;
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int lineStart = start;
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boolean endOfLine = false;
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while (i <= end) {
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char c = header.charAt(i);
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if (c == '\r' || c == '\n') {
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if (!endOfLine) {
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buffer.append(header.substring(lineStart, i));
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endOfLine = true;
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}
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}
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else {
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if (endOfLine) {
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endOfLine = false;
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if (c == ' ' || c == '\t') {
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buffer.append(' ');
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lineStart = i + 1;
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}
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else {
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lineStart = i;
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}
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}
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}
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i++;
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}
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buffer.append(header.substring(lineStart, i));
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buffer.append('\n');
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HeaderParser hp = ParserFactory.createParser(buffer.toString());
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if (hp == null)
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throw new ParseException("could not create parser", 0);
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return hp.parse();
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}
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/**
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* Parse the SIP Request Line
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*
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* @param requestLine
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* a String containing the request line to be parsed.
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* @return a RequestLine structure that has the parsed RequestLine
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* @exception ParseException
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* if there was an error parsing the requestLine.
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*/
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public RequestLine parseSIPRequestLine(String requestLine)
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throws ParseException {
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requestLine += "\n";
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return new RequestLineParser(requestLine).parse();
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}
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/**
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* Parse the SIP Response message status line
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*
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* @param statusLine
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* a String containing the Status line to be parsed.
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* @return StatusLine class corresponding to message
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* @exception ParseException
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* if there was an error parsing
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* @see StatusLine
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*/
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public StatusLine parseSIPStatusLine(String statusLine)
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throws ParseException {
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statusLine += "\n";
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return new StatusLineParser(statusLine).parse();
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}
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public static void setComputeContentLengthFromMessage(
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boolean computeContentLengthFromMessage) {
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GBStringMsgParser.computeContentLengthFromMessage = computeContentLengthFromMessage;
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}
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}
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