SMACK-425 Introduced smack.parsing.ParsingExceptionCallback, a callback invoked when a exception is thrown while parsing a stanza. Smack is now able to either rethrow the exception ulitmatly causing a disconnect *or* log/ignore the exception and resume parsing after the faulty stanza.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_1@13688 b35dd754-fafc-0310-a699-88a17e54d16e

build/eclipse/settings/org.eclipse.jdt.ui.prefs

@@ -1,4 +1,3 @@
-#Tue Jan 29 23:27:16 CET 2013
 eclipse.preferences.version=1
 editor_save_participant_org.eclipse.jdt.ui.postsavelistener.cleanup=true
 formatter_profile=_ignite
@@ -37,7 +36,7 @@ sp_cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=
 sp_cleanup.qualify_static_member_accesses_with_declaring_class=false
 sp_cleanup.qualify_static_method_accesses_with_declaring_class=false
 sp_cleanup.remove_private_constructors=true
-sp_cleanup.remove_trailing_whitespaces=false
+sp_cleanup.remove_trailing_whitespaces=true
 sp_cleanup.remove_trailing_whitespaces_all=true
 sp_cleanup.remove_trailing_whitespaces_ignore_empty=false
 sp_cleanup.remove_unnecessary_casts=true

source/org/jivesoftware/smack/PacketReader.java

@@ -22,6 +22,10 @@ package org.jivesoftware.smack;
 
 import org.jivesoftware.smack.Connection.ListenerWrapper;
 import org.jivesoftware.smack.packet.*;
+import org.jivesoftware.smack.parsing.ParsingExceptionCallback;
+import org.jivesoftware.smack.parsing.UnparsedIQ;
+import org.jivesoftware.smack.parsing.UnparsedMessage;
+import org.jivesoftware.smack.parsing.UnparsedPresence;
 import org.jivesoftware.smack.sasl.SASLMechanism.Challenge;
 import org.jivesoftware.smack.sasl.SASLMechanism.Failure;
 import org.jivesoftware.smack.sasl.SASLMechanism.Success;
@@ -176,14 +180,49 @@ class PacketReader {
             int eventType = parser.getEventType();
             do {
                 if (eventType == XmlPullParser.START_TAG) {
+                    int parserDepth = parser.getDepth();
+                    ParsingExceptionCallback callback = connection.getParsingExceptionCallback();
                     if (parser.getName().equals("message")) {
-                        processPacket(PacketParserUtils.parseMessage(parser));
+                        Packet packet;
+                        try {
+                            packet = PacketParserUtils.parseMessage(parser);
+                        } catch (Exception e) {
+                            String content = PacketParserUtils.parseContentDepth(parser, parserDepth);
+                            UnparsedMessage message = new UnparsedMessage(content, e);
+                            if (callback != null) {
+                                callback.messageParsingException(e, message);
+                            }
+                            continue;
+                        }
+                        processPacket(packet);
                     }
                     else if (parser.getName().equals("iq")) {
-                        processPacket(PacketParserUtils.parseIQ(parser, connection));
+                        IQ iq;
+                        try {
+                            iq = PacketParserUtils.parseIQ(parser, connection);
+                        } catch (Exception e) {
+                            String content = PacketParserUtils.parseContentDepth(parser, parserDepth);
+                            UnparsedIQ uniq = new UnparsedIQ(content, e);
+                            if (callback != null) {
+                                callback.iqParsingException(e, uniq);
+                            }
+                            continue;
+                        }
+                        processPacket(iq);
                     }
                     else if (parser.getName().equals("presence")) {
-                        processPacket(PacketParserUtils.parsePresence(parser));
+                        Presence presence;
+                        try {
+                            presence = PacketParserUtils.parsePresence(parser);
+                        } catch (Exception e) {
+                            String content = PacketParserUtils.parseContentDepth(parser, parserDepth);
+                            UnparsedPresence unpresence = new UnparsedPresence(content, e);
+                            if (callback != null) {
+                                callback.presenceParsingException(e, unpresence);
+                            }
+                            continue;
+                        }
+                        processPacket(presence);
                     }
                     // We found an opening stream. Record information about it, then notify
                     // the connectionID lock so that the packet reader startup can finish.

source/org/jivesoftware/smack/SmackConfiguration.java

@@ -28,6 +28,8 @@ import java.util.Enumeration;
 import java.util.List;
 import java.util.Vector;
 
+import org.jivesoftware.smack.parsing.ParsingExceptionCallback;
+import org.jivesoftware.smack.parsing.ThrowException;
 import org.xmlpull.mxp1.MXParser;
 import org.xmlpull.v1.XmlPullParser;
 
@@ -58,6 +60,12 @@ public final class SmackConfiguration {
     private static int localSocks5ProxyPort = 7777;
     private static int packetCollectorSize = 5000;
 
+    /**
+     * The default parsing exception callback is {@link ThrowException} which will
+     * throw an exception and therefore disconnect the active connection.
+     */
+    private static ParsingExceptionCallback defaultCallback = new ThrowException();
+
     /**
      * This automatically enables EntityCaps for new connections if it is set to true
      */
@@ -328,6 +336,26 @@ public final class SmackConfiguration {
         autoEnableEntityCaps = b;
     }
 
+    /**
+     * Set the default parsing exception callback for all newly created connections
+     *
+     * @param callback
+     * @see ParsingExceptionCallback
+     */
+    public static void setDefaultParsingExceptionCallback(ParsingExceptionCallback callback) {
+        defaultCallback = callback;
+    }
+
+    /**
+     * Returns the default parsing exception callback
+     * 
+     * @return the default parsing exception callback
+     * @see ParsingExceptionCallback
+     */
+    public static ParsingExceptionCallback getDefaultParsingExceptionCallback() {
+        return defaultCallback;
+    }
+
     private static void parseClassToLoad(XmlPullParser parser) throws Exception {
         String className = parser.nextText();
         // Attempt to load the class so that the class can get initialized

source/org/jivesoftware/smack/XMPPConnection.java

@@ -25,6 +25,7 @@ import org.jivesoftware.smack.filter.PacketFilter;
 import org.jivesoftware.smack.packet.Packet;
 import org.jivesoftware.smack.packet.Presence;
 import org.jivesoftware.smack.packet.XMPPError;
+import org.jivesoftware.smack.parsing.ParsingExceptionCallback;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.util.dns.HostAddress;
 
@@ -89,6 +90,8 @@ public class XMPPConnection extends Connection {
     private boolean anonymous = false;
     private boolean usingTLS = false;
 
+    private ParsingExceptionCallback parsingExceptionCallback = SmackConfiguration.getDefaultParsingExceptionCallback();
+
     PacketWriter packetWriter;
     PacketReader packetReader;
 
@@ -202,6 +205,25 @@ public class XMPPConnection extends Connection {
         return user;
     }
 
+    /**
+     * Install a parsing exception callback, which will be invoked once an exception is encountered while parsing a
+     * stanza
+     * 
+     * @param callback the callback to install
+     */
+    public void setParsingExceptionCallback(ParsingExceptionCallback callback) {
+        parsingExceptionCallback = callback;
+    }
+
+    /**
+     * Get the current active parsing exception callback.
+     *  
+     * @return the active exception callback or null if there is none
+     */
+    public ParsingExceptionCallback getParsingExceptionCallback() {
+        return parsingExceptionCallback;
+    }
+
     @Override
     public synchronized void login(String username, String password, String resource) throws XMPPException {
         if (!isConnected()) {

source/org/jivesoftware/smack/parsing/LogException.java

@@ -0,0 +1,51 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2013 Florian Schmaus.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.parsing;
+
+/**
+ * Simple parsing exception callback that only logs the encountered parsing exception to stderr.
+ * 
+ * @author Florian Schmaus
+ * 
+ */
+public class LogException extends ParsingExceptionCallback {
+
+    @Override
+    public void messageParsingException(Exception e, UnparsedMessage message) throws Exception {
+        System.err.print("Smack message parsing exception: " + e.getMessage());
+        e.printStackTrace();
+        System.err.println("Unparsed content: " + message.getContent());
+    }
+
+    @Override
+    public void iqParsingException(Exception e, UnparsedIQ iq) throws Exception {
+        System.err.print("Smack iq parsing exception: " + e.getMessage());
+        e.printStackTrace();
+        System.err.println("Unparsed content: " + iq.getContent());
+    }
+
+    @Override
+    public void presenceParsingException(Exception e, UnparsedPresence presence) throws Exception {
+        System.err.print("Smack presence parsing exception: " + e.getMessage());
+        e.printStackTrace();
+        System.err.println("Unparsed content: " + presence.getContent());
+    }
+}

source/org/jivesoftware/smack/parsing/ParsingExceptionCallback.java

@@ -0,0 +1,76 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2013 Florian Schmaus.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.parsing;
+
+/**
+ * Base class to receive parsing exceptions.
+ * 
+ * If this class is used as callback, then Smack will silently ignore the stanza that caused the parsing exception and
+ * place the parser after the faulty stanza.
+ * 
+ * Subclasses may or may not override certain methods of this class. Each of these methods will receive the exception
+ * that caused the parsing error and an instance of an Unparsed Packet type. The latter can be used to inspect the
+ * stanza that caused the parsing error by using the getContent() (for example {@link UnparsedIQ#getContent()})
+ * method.
+ * 
+ * Smack provides 2 predefined ParsingExceptionCallback's: {@link LogException} and {@link ThrowException}.
+ * 
+ * @author Florian Schmaus
+ * 
+ */
+public abstract class ParsingExceptionCallback {
+
+    /**
+     * Called when parsing an message stanza caused an exception.
+     * 
+     * @param e
+     * the exception thrown while parsing the message stanza
+     * @param message
+     * the raw message stanza data that caused the exception
+     * @throws Exception
+     */
+    public void messageParsingException(Exception e, UnparsedMessage message) throws Exception {
+    }
+
+    /**
+     * Called when parsing an IQ stanza caused an exception.
+     * 
+     * @param e
+     * the exception thrown while parsing the iq stanza
+     * @param iq
+     * the raw iq stanza data that caused the exception
+     * @throws Exception
+     */
+    public void iqParsingException(Exception e, UnparsedIQ iq) throws Exception {
+    }
+
+    /**
+     * Called when parsing a presence stanza caused an exception.
+     * 
+     * @param e
+     * the exception thrown while parsing the presence stanza
+     * @param presence
+     * the raw presence stanza data that caused the exception
+     * @throws Exception
+     */
+    public void presenceParsingException(Exception e, UnparsedPresence presence) throws Exception {
+    }
+}

source/org/jivesoftware/smack/parsing/ThrowException.java

@@ -0,0 +1,48 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2013 Florian Schmaus.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.parsing;
+
+import org.jivesoftware.smack.ConnectionListener;
+
+/**
+ * Parsing exception callback class that simply throws the encountered parsing exception. This usually leads to an
+ * {@link ConnectionListener#connectionClosedOnError(Exception)} disconnect of the connection.
+ * 
+ * @author Florian Schmaus
+ * 
+ */
+public class ThrowException extends ParsingExceptionCallback {
+
+    @Override
+    public void messageParsingException(Exception e, UnparsedMessage message) throws Exception {
+        throw e;
+    }
+
+    @Override
+    public void iqParsingException(Exception e, UnparsedIQ iq) throws Exception {
+        throw e;
+    }
+
+    @Override
+    public void presenceParsingException(Exception e, UnparsedPresence presence) throws Exception {
+        throw e;
+    }
+}

source/org/jivesoftware/smack/parsing/UnparsedIQ.java

@@ -0,0 +1,62 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2013 Florian Schmaus.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.parsing;
+
+import org.jivesoftware.smack.packet.IQ;
+
+/**
+ * Representation of an unparsed IQ stanza.
+ * 
+ * @author Florian Schmaus
+ *
+ */
+public class UnparsedIQ extends IQ {
+    private final String content;
+    private final Exception e;
+
+    public UnparsedIQ(final String content, final Exception e) {
+        this.content = content;
+        this.e = e;
+    }
+
+    /**
+     * 
+     * @return the exception that caused the parser to fail
+     */
+    public Exception getException() {
+        return e;
+    }
+
+    /**
+     * Retrieve the raw stanza data
+     * 
+     * @return the raw stanza data
+     */
+    public String getContent() {
+        return content;
+    }
+
+    @Override
+    public String getChildElementXML() {
+        return null;
+    }
+
+}

source/org/jivesoftware/smack/parsing/UnparsedMessage.java

@@ -0,0 +1,57 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2013 Florian Schmaus.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.parsing;
+
+import org.jivesoftware.smack.packet.Message;
+
+/**
+ * Representation of an unparsed IQ stanza.
+ * 
+ * @author Florian Schmaus
+ *
+ */
+public class UnparsedMessage extends Message {
+    private final String content;
+    private final Exception e;
+
+    public UnparsedMessage(final String content, final Exception e) {
+        this.content = content;
+        this.e = e;
+    }
+
+    /**
+     * 
+     * @return the exception that caused the parser to fail
+     */
+    public Exception getException() {
+        return e;
+    }
+
+    /**
+     * Retrieve the raw stanza data
+     * 
+     * @return the raw stanza data
+     */
+    public String getContent() {
+        return content;
+    }
+
+}

source/org/jivesoftware/smack/parsing/UnparsedPresence.java

@@ -0,0 +1,61 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2013 Florian Schmaus.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack.parsing;
+
+import org.jivesoftware.smack.packet.Presence;
+
+/**
+ * Representation of an unparsed IQ stanza.
+ * 
+ * @author Florian Schmaus
+ *
+ */
+public class UnparsedPresence extends Presence {
+    private String content;
+    private Exception e;
+    
+    public UnparsedPresence(Type type) {
+        super(type);
+    }
+    
+    public UnparsedPresence(final String content, final Exception e) {
+        super(Presence.Type.error);
+        this.content = content;
+        this.e = e;
+    }
+
+    /**
+     * 
+     * @return the exception that caused the parser to fail
+     */
+    public Exception getException() {
+        return e;
+    }
+
+    /**
+     * Retrieve the raw stanza data
+     * 
+     * @return the raw stanza data
+     */
+    public String getContent() {
+        return content;
+    }
+}

source/org/jivesoftware/smack/util/PacketParserUtils.java

@@ -171,10 +171,13 @@ public class PacketParserUtils {
      */
     private static String parseContent(XmlPullParser parser)
                     throws XmlPullParserException, IOException {
-        StringBuffer content = new StringBuffer();
         int parserDepth = parser.getDepth();
-        while (!(parser.next() == XmlPullParser.END_TAG && parser
-                        .getDepth() == parserDepth)) {
+        return parseContentDepth(parser, parserDepth);
+    }
+
+    public static String parseContentDepth(XmlPullParser parser, int depth) throws XmlPullParserException, IOException {
+        StringBuffer content = new StringBuffer();
+        while (!(parser.next() == XmlPullParser.END_TAG && parser.getDepth() == depth)) {
             content.append(parser.getText());
         }
         return content.toString();

test-unit/org/jivesoftware/smack/parsing/ParsingExceptionTest.java

@@ -0,0 +1,70 @@
+package org.jivesoftware.smack.parsing;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.jivesoftware.smack.TestUtils;
+import org.jivesoftware.smack.XMPPException;
+import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smack.provider.PacketExtensionProvider;
+import org.jivesoftware.smack.provider.ProviderManager;
+import org.jivesoftware.smack.util.PacketParserUtils;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.xmlpull.v1.XmlPullParser;
+
+public class ParsingExceptionTest {
+    private final static ProviderManager PM = ProviderManager.getInstance();
+
+    private final static String EXTENSION2 =
+    "<extension2 xmlns='namespace'>" +
+        "<bar node='testNode'>" +
+            "<i id='testid1' >" +
+            "</i>" +
+        "</bar>" +
+     "</extension2>";
+
+    @Before
+    public void init() {
+        PM.addExtensionProvider(ThrowException.ELEMENT, ThrowException.NAMESPACE, new ThrowException());
+    }
+
+    @After
+    public void tini() {
+        PM.removeExtensionProvider(ThrowException.ELEMENT, ThrowException.NAMESPACE);
+    }
+
+    @Test
+    public void consumeUnparsedInput() throws Exception {
+        XmlPullParser parser = TestUtils.getMessageParser(
+                "<message from='user@server.example' to='francisco@denmark.lit' id='foo'>" +
+                    "<" + ThrowException.ELEMENT + " xmlns='" + ThrowException.NAMESPACE + "'>" +
+                       "<nothingInHere>" +
+                       "</nothingInHere>" +
+                    "</" + ThrowException.ELEMENT + ">" +
+                    EXTENSION2 +
+                "</message>");
+        int parserDepth = parser.getDepth();
+        String content = null;
+        try {
+            PacketParserUtils.parseMessage(parser);
+        } catch (Exception e) {
+            content = PacketParserUtils.parseContentDepth(parser, parserDepth);
+        }
+        assertNotNull(content);
+        assertEquals(content, "<nothingInHere></nothingInHere>" + "</" + ThrowException.ELEMENT + ">" + EXTENSION2);
+
+    }
+
+    static class ThrowException implements PacketExtensionProvider {
+        public static final String ELEMENT = "exception";
+        public static final String NAMESPACE = "http://smack.jivesoftware.org/exception";
+
+        @Override
+        public PacketExtension parseExtension(XmlPullParser parser) throws Exception {
+            throw new XMPPException("Test Exception");
+        }
+
+    }
+}