/*
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 <http://www.gnu.org/licenses/>.
Copyright 2007, 2008, 2009, 2010 Yohann Martineau
*/
package net.sourceforge.peers.sip;
import java.net.InetAddress;
import net.sourceforge.peers.sip.core.useragent.UAS;
import net.sourceforge.peers.sip.syntaxencoding.SipHeaderFieldMultiValue;
import net.sourceforge.peers.sip.syntaxencoding.SipHeaderFieldName;
import net.sourceforge.peers.sip.syntaxencoding.SipHeaderFieldValue;
import net.sourceforge.peers.sip.syntaxencoding.SipHeaders;
import net.sourceforge.peers.sip.transport.SipMessage;
public class Utils {
public static final String PEERSHOME_SYSTEM_PROPERTY = "peers.home";
public static final String DEFAULT_PEERS_HOME = ".";
public final static SipHeaderFieldValue getTopVia(SipMessage sipMessage) {
SipHeaders sipHeaders = sipMessage.getSipHeaders();
SipHeaderFieldName viaName = new SipHeaderFieldName(RFC3261.HDR_VIA);
SipHeaderFieldValue via = sipHeaders.get(viaName);
if (via instanceof SipHeaderFieldMultiValue) {
via = ((SipHeaderFieldMultiValue)via).getValues().get(0);
}
return via;
}
public final static String generateTag() {
return randomString(8);
}
public final static String generateCallID(InetAddress inetAddress) {
//TODO make a hash using current time millis, public ip @, private @, and a random string
StringBuffer buf = new StringBuffer();
buf.append(randomString(8));
buf.append('-');
buf.append(String.valueOf(System.currentTimeMillis()));
buf.append('@');
buf.append(inetAddress.getHostName());
return buf.toString();
}
public final static String generateBranchId() {
StringBuffer buf = new StringBuffer();
buf.append(RFC3261.BRANCHID_MAGIC_COOKIE);
//TODO must be unique across space and time...
buf.append(randomString(9));
return buf.toString();
}
public final static String getMessageCallId(SipMessage sipMessage) {
SipHeaderFieldValue callId = sipMessage.getSipHeaders().get(
new SipHeaderFieldName(RFC3261.HDR_CALLID));
return callId.getValue();
}
public final static String randomString(int length) {
String chars = "abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIFKLMNOPRSTUVWXYZ" +
"0123456789";
StringBuffer buf = new StringBuffer(length);
for (int i = 0; i < length; ++i) {
int pos = (int)Math.round(Math.random() * (chars.length() - 1));
buf.append(chars.charAt(pos));
}
return buf.toString();
}
public final static void copyHeader(SipMessage src, SipMessage dst, String name) {
SipHeaderFieldName sipHeaderFieldName = new SipHeaderFieldName(name);
SipHeaderFieldValue sipHeaderFieldValue = src.getSipHeaders().get(sipHeaderFieldName);
if (sipHeaderFieldValue != null) {
dst.getSipHeaders().add(sipHeaderFieldName, sipHeaderFieldValue);
}
}
public final static String getUserPart(String sipUri) {
int start = sipUri.indexOf(RFC3261.SCHEME_SEPARATOR);
int end = sipUri.indexOf(RFC3261.AT);
return sipUri.substring(start + 1, end);
}
/**
* adds Max-Forwards Supported and Require headers
* @param headers
*/
public final static void addCommonHeaders(SipHeaders headers) {
//Max-Forwards
headers.add(new SipHeaderFieldName(RFC3261.HDR_MAX_FORWARDS),
new SipHeaderFieldValue(
String.valueOf(RFC3261.DEFAULT_MAXFORWARDS)));
//TODO Supported and Require
}
public final static String generateAllowHeader() {
StringBuffer buf = new StringBuffer();
for (String supportedMethod: UAS.SUPPORTED_METHODS) {
buf.append(supportedMethod);
buf.append(", ");
}
int bufLength = buf.length();
buf.delete(bufLength - 2, bufLength);
return buf.toString();
}
}