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Add PubSubManager.getOrCreateLeafNode(String)

This commit is contained in:
Florian Schmaus 2017-03-18 18:31:06 +01:00
parent 3ce5973915
commit 1e0481b355
2 changed files with 114 additions and 6 deletions

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@ -0,0 +1,45 @@
/**
*
* Copyright 2017 Florian Schmaus
*
* 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.smackx.pubsub;
import org.jxmpp.jid.BareJid;
public abstract class PubSubAssertionError extends AssertionError {
/**
*
*/
private static final long serialVersionUID = 1L;
protected PubSubAssertionError(String message) {
super(message);
}
public static class DiscoInfoNodeAssertionError extends PubSubAssertionError {
/**
*
*/
private static final long serialVersionUID = 1L;
DiscoInfoNodeAssertionError(BareJid pubSubService, String nodeId) {
super("PubSub service '" + pubSubService + "' returned disco info result for node '" + nodeId
+ "', but it did not contain an Identity of type 'leaf' or 'collection' (and category 'pubsub'), which is not allowed according to XEP-60 5.3.");
}
}
}

View file

@ -16,6 +16,8 @@
*/
package org.jivesoftware.smackx.pubsub;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
@ -34,6 +36,7 @@ import org.jivesoftware.smack.packet.EmptyResultIQ;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.XMPPError;
import org.jivesoftware.smack.packet.IQ.Type;
import org.jivesoftware.smack.packet.XMPPError.Condition;
import org.jivesoftware.smack.packet.Stanza;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
@ -246,12 +249,7 @@ public final class PubSubManager extends Manager {
// XEP-60 5.3 states that
// "The 'disco#info' result MUST include an identity with a category of 'pubsub' and a type of either 'leaf' or 'collection'."
// If this is not the case, then we are dealing with an PubSub implementation that doesn't follow the specification.
throw new AssertionError(
"PubSub service '"
+ pubSubService
+ "' returned disco info result for node '"
+ id
+ "', but it did not contain an Identity of type 'leaf' or 'collection' (and category 'pubsub'), which is not allowed according to XEP-60 5.3.");
throw new PubSubAssertionError.DiscoInfoNodeAssertionError(pubSubService, id);
}
nodeMap.put(id, node);
}
@ -260,6 +258,71 @@ public final class PubSubManager extends Manager {
return res;
}
/**
* Try to get a leaf node and create one if it does not already exist.
*
* @param id The unique ID of the node.
* @return the leaf node.
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
* @throws XMPPErrorException
* @since 4.2.1
*/
public LeafNode getOrCreateLeafNode(final String id)
throws NoResponseException, NotConnectedException, InterruptedException, XMPPErrorException {
try {
return getNode(id);
}
catch (XMPPErrorException e1) {
if (e1.getXMPPError().getCondition() == Condition.item_not_found) {
try {
return createNode(id);
}
catch (XMPPErrorException e2) {
if (e2.getXMPPError().getCondition() == Condition.conflict) {
// The node was created in the meantime, re-try getNode(). Note that this case should be rare.
return getNode(id);
}
throw e2;
}
}
throw e1;
}
catch (PubSubAssertionError.DiscoInfoNodeAssertionError e) {
// This could be caused by Prosody bug #805 (see https://prosody.im/issues/issue/805). Prosody does not
// answer to disco#info requests on the node ID, which makes it undecidable if a node is a leaf or
// collection node.
LOGGER.warning("The PubSub service " + pubSubService
+ " threw an DiscoInfoNodeAssertionError, trying workaround for Prosody bug #805 (https://prosody.im/issues/issue/805)");
return getOrCreateLeafNodeProsodyWorkaround(id);
}
}
private LeafNode getOrCreateLeafNodeProsodyWorkaround(final String id)
throws XMPPErrorException, NoResponseException, NotConnectedException, InterruptedException {
try {
return createNode(id);
}
catch (XMPPErrorException e1) {
if (e1.getXMPPError().getCondition() == Condition.conflict) {
Constructor<?> constructor = LeafNode.class.getDeclaredConstructors()[0];
constructor.setAccessible(true);
LeafNode res;
try {
res = (LeafNode) constructor.newInstance(this, id);
}
catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException e2) {
throw new AssertionError(e2);
}
// TODO: How to verify that this is actually a leafe node and not a conflict with a collection node?
return res;
}
throw e1;
}
}
/**
* Get all the nodes that currently exist as a child of the specified
* collection node. If the service does not support collection nodes