fixed caps hash generation for empty form values

src/main/java/eu/siacs/conversations/entities/Presence.java

@@ -1,5 +1,7 @@
 package eu.siacs.conversations.entities;
 
+import android.support.annotation.NonNull;
+
 import java.lang.Comparable;
 import java.util.Locale;
 
@@ -62,7 +64,7 @@ public class Presence implements Comparable {
 		return new Presence(Status.fromShowString(show), ver, hash, node, message);
 	}
 
-	public int compareTo(Object other) {
+	public int compareTo(@NonNull Object other) {
 		return this.status.compareTo(((Presence)other).status);
 	}
 

src/main/java/eu/siacs/conversations/entities/ServiceDiscoveryResult.java

@@ -2,7 +2,10 @@ package eu.siacs.conversations.entities;
 
 import android.content.ContentValues;
 import android.database.Cursor;
+import android.support.annotation.NonNull;
 import android.util.Base64;
+import android.util.Log;
+
 import java.io.UnsupportedEncodingException;
 import java.lang.Comparable;
 import java.security.MessageDigest;
@@ -16,6 +19,7 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import eu.siacs.conversations.Config;
 import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xml.Namespace;
 import eu.siacs.conversations.xmpp.forms.Data;
@@ -27,95 +31,11 @@ public class ServiceDiscoveryResult {
 	public static final String HASH = "hash";
 	public static final String VER = "ver";
 	public static final String RESULT = "result";
-
-	protected static String blankNull(String s) {
-		return s == null ? "" : s;
-	}
-
-	public static class Identity implements Comparable {
-		protected final String category;
-		protected final String type;
-		protected final String lang;
-		protected final String name;
-
-		public Identity(final String category, final String type, final String lang, final String name) {
-			this.category = category;
-			this.type = type;
-			this.lang = lang;
-			this.name = name;
-		}
-
-		public Identity(final Element el) {
-			this(
-				el.getAttribute("category"),
-				el.getAttribute("type"),
-				el.getAttribute("xml:lang"),
-				el.getAttribute("name")
-			);
-		}
-
-		public Identity(final JSONObject o) {
-
-			this(
-				o.optString("category", null),
-				o.optString("type", null),
-				o.optString("lang", null),
-				o.optString("name", null)
-			);
-		}
-
-		public String getCategory() {
-			return this.category;
-		}
-
-		public String getType() {
-			return this.type;
-		}
-
-		public String getLang() {
-			return this.lang;
-		}
-
-		public String getName() {
-			return this.name;
-		}
-
-		public int compareTo(Object other) {
-			Identity o = (Identity)other;
-			int r = blankNull(this.getCategory()).compareTo(blankNull(o.getCategory()));
-			if(r == 0) {
-				r = blankNull(this.getType()).compareTo(blankNull(o.getType()));
-			}
-			if(r == 0) {
-				r = blankNull(this.getLang()).compareTo(blankNull(o.getLang()));
-			}
-			if(r == 0) {
-				r = blankNull(this.getName()).compareTo(blankNull(o.getName()));
-			}
-
-			return r;
-		}
-
-		public JSONObject toJSON() {
-			try {
-				JSONObject o = new JSONObject();
-				o.put("category", this.getCategory());
-				o.put("type", this.getType());
-				o.put("lang", this.getLang());
-				o.put("name", this.getName());
-				return o;
-			} catch(JSONException e) {
-				return null;
-			}
-		}
-	}
-
 	protected final String hash;
 	protected final byte[] ver;
-	protected final List<Identity> identities;
 	protected final List<String> features;
 	protected final List<Data> forms;
-
+	private final List<Identity> identities;
 	public ServiceDiscoveryResult(final IqPacket packet) {
 		this.identities = new ArrayList<>();
 		this.features = new ArrayList<>();
@@ -140,8 +60,7 @@ public class ServiceDiscoveryResult {
 		}
 		this.ver = this.mkCapHash();
 	}
-
+	private ServiceDiscoveryResult(String hash, byte[] ver, JSONObject o) throws JSONException {
-	public ServiceDiscoveryResult(String hash, byte[] ver, JSONObject o) throws JSONException {
 		this.identities = new ArrayList<>();
 		this.features = new ArrayList<>();
 		this.forms = new ArrayList<>();
@@ -168,6 +87,22 @@ public class ServiceDiscoveryResult {
 		}
 	}
 
+	public ServiceDiscoveryResult(Cursor cursor) throws JSONException {
+		this(
+				cursor.getString(cursor.getColumnIndex(HASH)),
+				Base64.decode(cursor.getString(cursor.getColumnIndex(VER)), Base64.DEFAULT),
+				new JSONObject(cursor.getString(cursor.getColumnIndex(RESULT)))
+		);
+	}
+
+	private static String clean(String s) {
+		return s.replace("<","&lt;");
+	}
+
+	private static String blankNull(String s) {
+		return s == null ? "" : clean(s);
+	}
+
 	private static Data createFormFromJSONObject(JSONObject o) {
 		Data data = new Data();
 		JSONArray names = o.names();
@@ -214,14 +149,6 @@ public class ServiceDiscoveryResult {
 		return new String(Base64.encode(this.ver, Base64.DEFAULT)).trim();
 	}
 
-	public ServiceDiscoveryResult(Cursor cursor) throws JSONException {
-		this(
-			cursor.getString(cursor.getColumnIndex(HASH)),
-			Base64.decode(cursor.getString(cursor.getColumnIndex(VER)), Base64.DEFAULT),
-			new JSONObject(cursor.getString(cursor.getColumnIndex(RESULT)))
-		);
-	}
-
 	public List<Identity> getIdentities() {
 		return this.identities;
 	}
@@ -254,50 +181,42 @@ public class ServiceDiscoveryResult {
 		return null;
 	}
 
-	protected byte[] mkCapHash() {
+	private byte[] mkCapHash() {
 		StringBuilder s = new StringBuilder();
 
 		List<Identity> identities = this.getIdentities();
 		Collections.sort(identities);
 
 		for (Identity id : identities) {
-			s.append(
+			s.append(blankNull(id.getCategory()))
-				blankNull(id.getCategory()) + "/" +
+					.append("/")
-				blankNull(id.getType()) + "/" +
+					.append(blankNull(id.getType()))
-				blankNull(id.getLang()) + "/" +
+					.append("/")
-				blankNull(id.getName()) + "<"
+					.append(blankNull(id.getLang()))
-			);
+					.append("/")
+					.append(blankNull(id.getName()))
+					.append("<");
 		}
 
 		List<String> features = this.getFeatures();
 		Collections.sort(features);
 
 		for (String feature : features) {
-			s.append(feature + "<");
+			s.append(clean(feature)).append("<");
 		}
 
-		Collections.sort(forms, new Comparator<Data>() {
+		Collections.sort(forms, (lhs, rhs) -> lhs.getFormType().compareTo(rhs.getFormType()));
-			@Override
-			public int compare(Data lhs, Data rhs) {
-				return lhs.getFormType().compareTo(rhs.getFormType());
-			}
-		});
 
 		for (Data form : forms) {
-			s.append(form.getFormType() + "<");
+			s.append(clean(form.getFormType())).append("<");
 			List<Field> fields = form.getFields();
-			Collections.sort(fields, new Comparator<Field>() {
+			Collections.sort(fields, (lhs, rhs) -> lhs.getFieldName().compareTo(rhs.getFieldName()));
-				@Override
-				public int compare(Field lhs, Field rhs) {
-					return lhs.getFieldName().compareTo(rhs.getFieldName());
-				}
-			});
 			for (Field field : fields) {
-				s.append(field.getFieldName()+"<");
+				s.append(clean(field.getFieldName())).append("<");
 				List<String> values = field.getValues();
 				Collections.sort(values);
 				for (String value : values) {
-					s.append(value+"<");
+					s.append(blankNull(value)).append("<");
 				}
 			}
 		}
@@ -316,7 +235,7 @@ public class ServiceDiscoveryResult {
 		}
 	}
 
-	public JSONObject toJSON() {
+	private JSONObject toJSON() {
 		try {
 			JSONObject o = new JSONObject();
 
@@ -344,7 +263,86 @@ public class ServiceDiscoveryResult {
 		final ContentValues values = new ContentValues();
 		values.put(HASH, this.hash);
 		values.put(VER, getVer());
-		values.put(RESULT, this.toJSON().toString());
+		JSONObject jsonObject = toJSON();
+		values.put(RESULT, jsonObject == null ? "" : jsonObject.toString());
 		return values;
 	}
+
+	public static class Identity implements Comparable {
+		protected final String type;
+		protected final String lang;
+		protected final String name;
+		final String category;
+
+		Identity(final String category, final String type, final String lang, final String name) {
+			this.category = category;
+			this.type = type;
+			this.lang = lang;
+			this.name = name;
+		}
+
+		Identity(final Element el) {
+			this(
+					el.getAttribute("category"),
+					el.getAttribute("type"),
+					el.getAttribute("xml:lang"),
+					el.getAttribute("name")
+			);
+		}
+
+		Identity(final JSONObject o) {
+
+			this(
+					o.optString("category", null),
+					o.optString("type", null),
+					o.optString("lang", null),
+					o.optString("name", null)
+			);
+		}
+
+		public String getCategory() {
+			return this.category;
+		}
+
+		public String getType() {
+			return this.type;
+		}
+
+		public String getLang() {
+			return this.lang;
+		}
+
+		public String getName() {
+			return this.name;
+		}
+
+		public int compareTo(@NonNull Object other) {
+			Identity o = (Identity) other;
+			int r = blankNull(this.getCategory()).compareTo(blankNull(o.getCategory()));
+			if (r == 0) {
+				r = blankNull(this.getType()).compareTo(blankNull(o.getType()));
+			}
+			if (r == 0) {
+				r = blankNull(this.getLang()).compareTo(blankNull(o.getLang()));
+			}
+			if (r == 0) {
+				r = blankNull(this.getName()).compareTo(blankNull(o.getName()));
+			}
+
+			return r;
+		}
+
+		JSONObject toJSON() {
+			try {
+				JSONObject o = new JSONObject();
+				o.put("category", this.getCategory());
+				o.put("type", this.getType());
+				o.put("lang", this.getLang());
+				o.put("name", this.getName());
+				return o;
+			} catch (JSONException e) {
+				return null;
+			}
+		}
+	}
 }

src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

@@ -3649,20 +3649,21 @@ public class XmppConnectionService extends Service {
 				account.inProgressDiscoFetches.add(key);
 				IqPacket request = new IqPacket(IqPacket.TYPE.GET);
 				request.setTo(jid);
-				String node = presence.getNode();
+				final String node = presence.getNode();
-				Element query = request.query("http://jabber.org/protocol/disco#info");
+				final String ver = presence.getVer();
-				if (node != null) {
+				final Element query = request.query("http://jabber.org/protocol/disco#info");
-					query.setAttribute("node",node);
+				if (node != null && ver != null) {
+					query.setAttribute("node",node+"#"+ver);
 				}
-				Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": making disco request for " + key.second + " to " + jid+ "node="+node);
+				Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": making disco request for " + key.second + " to " + jid);
-				sendIqPacket(account, request, (a, discoPacket) -> {
+				sendIqPacket(account, request, (a, response) -> {
-					if (discoPacket.getType() == IqPacket.TYPE.RESULT) {
+					if (response.getType() == IqPacket.TYPE.RESULT) {
-						ServiceDiscoveryResult disco1 = new ServiceDiscoveryResult(discoPacket);
+						ServiceDiscoveryResult discoveryResult = new ServiceDiscoveryResult(response);
-						if (presence.getVer().equals(disco1.getVer())) {
+						if (presence.getVer().equals(discoveryResult.getVer())) {
-							databaseBackend.insertDiscoveryResult(disco1);
+							databaseBackend.insertDiscoveryResult(discoveryResult);
-							injectServiceDiscorveryResult(a.getRoster(), presence.getHash(), presence.getVer(), disco1);
+							injectServiceDiscorveryResult(a.getRoster(), presence.getHash(), presence.getVer(), discoveryResult);
 						} else {
-							Log.d(Config.LOGTAG, a.getJid().asBareJid() + ": mismatch in caps for contact " + jid + " " + presence.getVer() + " vs " + disco1.getVer());
+							Log.d(Config.LOGTAG, a.getJid().asBareJid() + ": mismatch in caps for contact " + jid + " " + presence.getVer() + " vs " + discoveryResult.getVer());
 						}
 					}
 					a.inProgressDiscoFetches.remove(key);

src/main/java/eu/siacs/conversations/xmpp/forms/Field.java

@@ -58,10 +58,7 @@ public class Field extends Element {
 		List<String> values = new ArrayList<>();
 		for(Element child : getChildren()) {
 			if ("value".equals(child.getName())) {
-				String content = child.getContent();
+				values.add(child.getContent());
-				if (content != null) {
-					values.add(content);
-				}
 			}
 		}
 		return values;