From ad3e23fa7c4bb2521c860f218dfa0b950285790d Mon Sep 17 00:00:00 2001
From: Daniel Gultsch <daniel@gultsch.de>
Date: Sun, 30 Mar 2014 21:21:55 +0200
Subject: [PATCH] ground work to support multiple auth mechanisms

---
 .../conversations/xmpp/XmppConnection.java    | 28 +++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/eu/siacs/conversations/xmpp/XmppConnection.java b/src/eu/siacs/conversations/xmpp/XmppConnection.java
index a32256ff4..36bd4be22 100644
--- a/src/eu/siacs/conversations/xmpp/XmppConnection.java
+++ b/src/eu/siacs/conversations/xmpp/XmppConnection.java
@@ -212,6 +212,9 @@ public class XmppConnection implements Runnable {
 			} else if (nextTag.isStart("failure")) {
 				tagReader.readElement(nextTag);
 				changeStatus(Account.STATUS_UNAUTHORIZED);
+			} else if (nextTag.isStart("challenge")) {
+				String challange = tagReader.readElement(nextTag).getContent();
+				Log.d(LOGTAG,"a challange arrived! "+challange);
 			} else if (nextTag.isStart("enabled")) {
 				this.stanzasSent = 0;
 				Element enabled = tagReader.readElement(nextTag);
@@ -446,7 +449,7 @@ public class XmppConnection implements Runnable {
 		}
 	}
 
-	private void sendSaslAuth() throws IOException, XmlPullParserException {
+	private void sendSaslAuthPlain() throws IOException {
 		String saslString = CryptoHelper.saslPlain(account.getUsername(),
 				account.getPassword());
 		Element auth = new Element("auth");
@@ -455,6 +458,13 @@ public class XmppConnection implements Runnable {
 		auth.setContent(saslString);
 		tagWriter.writeElement(auth);
 	}
+	
+	private void sendSaslAuthDigestMd5() throws IOException {
+		Element auth = new Element("auth");
+		auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
+		auth.setAttribute("mechanism", "DIGEST-MD5");
+		tagWriter.writeElement(auth);
+	}
 
 	private void processStreamFeatures(Tag currentTag)
 			throws XmlPullParserException, IOException {
@@ -469,7 +479,13 @@ public class XmppConnection implements Runnable {
 			disconnect(true);
 		} else if (this.streamFeatures.hasChild("mechanisms")
 				&& shouldAuthenticate) {
-			sendSaslAuth();
+			List<String> mechanisms = extractMechanisms( streamFeatures.findChild("mechanisms"));
+			Log.d(LOGTAG,account.getJid()+": "+mechanisms.toString());
+			if (mechanisms.contains("PLAIN")) {
+				sendSaslAuthPlain();
+			} else if (mechanisms.contains("DIGEST-MD5")) {
+				sendSaslAuthDigestMd5();
+			}
 		} else if (this.streamFeatures.hasChild("sm") && streamId != null) {
 			Log.d(LOGTAG,"found old stream id. trying to remuse");
 			ResumePacket resume = new ResumePacket(this.streamId,stanzasReceived);
@@ -485,6 +501,14 @@ public class XmppConnection implements Runnable {
 		}
 	}
 
+	private List<String> extractMechanisms(Element stream) {
+		ArrayList<String> mechanisms = new ArrayList<String>(stream.getChildren().size());
+		for(Element child : stream.getChildren()) {
+			mechanisms.add(child.getContent());
+		}
+		return mechanisms;
+	}
+
 	private void sendRegistryRequest() {
 		IqPacket register = new IqPacket(IqPacket.TYPE_GET);
 		register.query("jabber:iq:register");