net.sourceforge.peers.sip.syntaxencoding.SipParser Maven / Gradle / Ivy
/*
This file is part of Peers, a java SIP softphone.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see singleValueHeaders;
public SipParser() {
singleValueHeaders = new ArrayList();
singleValueHeaders.add(new SipHeaderFieldName(
RFC3261.HDR_WWW_AUTHENTICATE));
singleValueHeaders.add(new SipHeaderFieldName(
RFC3261.HDR_AUTHORIZATION));
singleValueHeaders.add(new SipHeaderFieldName(
RFC3261.HDR_PROXY_AUTHENTICATE));
singleValueHeaders.add(new SipHeaderFieldName(
RFC3261.HDR_PROXY_AUTHORIZATION));
singleValueHeaders.add(new SipHeaderFieldName(
RFC3261.HDR_SUPPORTED));
singleValueHeaders.add(new SipHeaderFieldName(
RFC3261.HDR_SUBJECT));
}
public synchronized SipMessage parse(InputStream in)
throws IOException, SipParserException {
InputStreamReader inputStreamReader = new InputStreamReader(in);
reader = new BufferedReader(inputStreamReader);
String startLine = reader.readLine();
while (startLine == null || startLine.equals("")) {
startLine = reader.readLine();
}
SipMessage sipMessage;
if (startLine.toUpperCase().startsWith(RFC3261.DEFAULT_SIP_VERSION)) {
sipMessage = parseSipResponse(startLine);
}
else {
sipMessage = parseSipRequest(startLine);
}
parseHeaders(sipMessage);
parseBody(sipMessage);
return sipMessage;
}
private SipRequest parseSipRequest(String startLine) throws SipParserException {
String[] params = startLine.split(" ");
if (params.length != 3) {
throw new SipParserException("invalid request line");
}
if (!RFC3261.DEFAULT_SIP_VERSION.equals(params[2].toUpperCase())) {
throw new SipParserException("unsupported SIP version");
}
SipURI requestUri;
try {
requestUri = new SipURI(params[1]);
} catch (SipUriSyntaxException e) {
throw new SipParserException(e);
}
return new SipRequest(params[0], requestUri);
}
private SipResponse parseSipResponse(String startLine) throws SipParserException {
String[] params = startLine.split(" ");
if (params.length < 3) {
throw new SipParserException("incorrect status line");
}
if (!RFC3261.DEFAULT_SIP_VERSION.equals(params[0].toUpperCase())) {
throw new SipParserException("unsupported SIP version");
}
StringBuffer buf = new StringBuffer();
for (int i = 2; i < params.length; ++i) {
buf.append(params[i]).append(" ");
}
buf.deleteCharAt(buf.length() - 1);
return new SipResponse(Integer.parseInt(params[1]), buf.toString());
}
private void parseHeaders(SipMessage sipMessage) throws IOException, SipParserException {
SipHeaders sipHeaders = new SipHeaders();
String headerLine = reader.readLine();
if (headerLine == null) {
throw new SipParserException(sipMessage.toString());
}
while (!"".equals(headerLine)) {
String nextLine = reader.readLine();
if (nextLine != null &&
(nextLine.startsWith(" ") || nextLine.startsWith("\t"))) {
StringBuffer buf = new StringBuffer(headerLine);
while (nextLine != null &&
(nextLine.startsWith(" ") || nextLine.startsWith("\t"))) {
buf.append(' ');
buf.append(nextLine.trim());
nextLine = reader.readLine();
}
headerLine = buf.toString();
}
if (headerLine == null) {
throw new SipParserException(sipMessage.toString());
}
int columnPos = headerLine.indexOf(RFC3261.FIELD_NAME_SEPARATOR);
if (columnPos < 0) {
throw new SipParserException("Invalid header line");
}
SipHeaderFieldName sipHeaderName = new SipHeaderFieldName(
headerLine.substring(0, columnPos).trim());
String value = headerLine.substring(columnPos + 1).trim();
SipHeaderFieldValue sipHeaderValue;
if (!singleValueHeaders.contains(sipHeaderName) &&
value.indexOf(RFC3261.HEADER_SEPARATOR) > -1) {
String[] values = value.split(RFC3261.HEADER_SEPARATOR);
List list =
new ArrayList();
for (String s: values) {
list.add(new SipHeaderFieldValue(s));
}
sipHeaderValue = new SipHeaderFieldMultiValue(list);
} else {
sipHeaderValue = new SipHeaderFieldValue(value);
}
sipHeaders.add(sipHeaderName, sipHeaderValue);
headerLine = nextLine;
}
sipMessage.setSipHeaders(sipHeaders);
}
public void parseBody(SipMessage sipMessage) throws IOException, SipParserException {
SipHeaderFieldValue contentLengthValue =
sipMessage.getSipHeaders().get(new SipHeaderFieldName(
RFC3261.HDR_CONTENT_LENGTH));
if (contentLengthValue == null) {
return;
}
int length = Integer.parseInt(contentLengthValue.toString());
byte[] buff = new byte[BUFF_SIZE];
int i;
int count = 0;
while (count < length && (i = reader.read()) != -1) {
if (count >= buff.length) {
byte[] aux = new byte[buff.length + BUFF_SIZE];
System.arraycopy(buff, 0, aux, 0, buff.length);
buff = aux;
}
buff[count++] = (byte)i;
}
if (count != buff.length) {
byte[] aux = new byte[count];
System.arraycopy(buff, 0, aux, 0, count);
buff = aux;
}
sipMessage.setBody(buff);
}
}