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/*
 * Copyright (C) 2005-2008 Jive Software. 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.openfire.pubsub;

import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import org.dom4j.Element;
import org.jivesoftware.util.JiveGlobals;
import org.jivesoftware.util.LocaleUtils;
import org.jivesoftware.util.XMPPDateTimeFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xmpp.forms.DataForm;
import org.xmpp.forms.FormField;
import org.xmpp.packet.IQ;
import org.xmpp.packet.JID;
import org.xmpp.packet.Message;
import org.xmpp.packet.Presence;

/**
 * A subscription to a node. Entities may subscribe to a node to be notified when new events
 * are published to the node. Published events may contain a {@link PublishedItem}. Only
 * nodes that are configured to not deliver payloads with event notifications and to not
 * persist items will let publishers to publish events without items thus not including
 * items in the notifications sent to subscribers.

* * Node subscriptions may need to be configured by the subscriber or approved by a node owner * to become active. The node configuration establishes whether configuration or approval are * required. In any case, the subscriber will not get event notifications until the subscription * is active.

* * Depending on the node configuration it may be possible for the same subscriber to subscribe * multiple times to the node. Each subscription may have a different configuration like for * instance different keywords. Keywords can be used as a way to filter the type of * {@link PublishedItem} to be notified of. When the same subscriber has subscribed multiple * times to the node a single notification is going to be sent to the subscriber instead of * sending a notification for each subscription. * * @author Matt Tucker */ public class NodeSubscription { private static final Logger Log = LoggerFactory.getLogger(NodeSubscription.class); private static final XMPPDateTimeFormat xmppDateTime = new XMPPDateTimeFormat(); /** * The node to which this subscription is interested in. */ private Node node; /** * JID of the entity that will receive the event notifications. */ private JID jid; /** * JID of the entity that owns this subscription. This JID is the JID of the * NodeAffiliate that is subscribed to the node. */ private JID owner; /** * ID that uniquely identifies the subscription of the user in the node. */ private String id; /** * Current subscription state. */ private State state; /** * Flag indicating whether an entity wants to receive or has disabled notifications. */ private boolean deliverNotifications = true; /** * Flag indicating whether an entity wants to receive digests (aggregations) of * notifications or all notifications individually. */ private boolean usingDigest = false; /** * The minimum number of milliseconds between sending any two notification digests. * Default is 24 hours. */ private int digestFrequency = 86400000; /** * The Date at which a leased subscription will end or has ended. A value of * null means that the subscription will never expire. */ private Date expire = null; /** * Flag indicating whether an entity wants to receive an XMPP message body in * addition to the payload format. */ private boolean includingBody = false; /** * The presence states for which an entity wants to receive notifications. */ private Collection presenceStates = new ArrayList<>(); /** * When subscribing to collection nodes it is possible to be interested in new nodes * added to the collection node or new items published in the children nodes. The default * value is "nodes". */ private Type type = Type.nodes; /** * Receive notification from children up to certain depth. Possible values are 1 or 0. * Zero means that there is no depth limit. */ private int depth = 1; /** * Keyword that the event needs to match. When null all event are going to * be notified to the subscriber. */ private String keyword = null; /** * Indicates if the subscription is present in the database. */ private boolean savedToDB = false; /** * Creates a new subscription of the specified user with the node. * * @param node Node to which this subscription is interested in. * @param owner the JID of the entity that owns this subscription. * @param jid the JID of the user that owns the subscription. * @param state the state of the subscription with the node. * @param id the id the uniquely identifies this subscriptin within the node. */ public NodeSubscription(Node node, JID owner, JID jid, State state, String id) { this.node = node; this.jid = jid; this.owner = owner; this.state = state; this.id = id; } /** * Returns the node that holds this subscription. * * @return the node that holds this subscription. */ public Node getNode() { return node; } /** * Returns the ID that uniquely identifies the subscription of the user in the node. * * @return the ID that uniquely identifies the subscription of the user in the node. */ public String getID() { return id; } /** * Returns the JID that is going to receive the event notifications. This JID can be the * owner JID or a full JID if the owner wants to receive the notification at a particular * resource.

* * Moreover, since subscriber and owner are separated it should be theorically possible to * have a different owner JID (e.g. [email protected]) and a subscriber JID * (e.g. [email protected]). Note that letting this case to happen may open the pubsub service * to get spam or security problems. However, the pubsub service should avoid this case to * happen. * * @return the JID that is going to receive the event notifications. */ public JID getJID() { return jid; } /** * Retuns the JID of the entity that owns this subscription. The owner entity will have * a {@link NodeAffiliate} for the owner JID. The owner may have more than one subscription * with the node based on what this message * {@link org.jivesoftware.openfire.pubsub.Node#isMultipleSubscriptionsEnabled()}. * * @return he JID of the entity that owns this subscription. */ public JID getOwner() { return owner; } /** * Returns the current subscription state. Subscriptions with status of pending should be * authorized by a node owner. * * @return the current subscription state. */ public State getState() { return state; } /** * Returns true if configuration is required by the node and is still pending to * be configured by the subscriber. Otherwise return false. Once a subscription is * configured it might need to be approved by a node owner to become active. * * @return true if configuration is required by the node and is still pending to * be configured by the subscriber. */ public boolean isConfigurationPending() { return state == State.unconfigured; } /** * Returns true if the subscription needs to be approved by a node owner to become * active. Until the subscription is not activated the subscriber will not receive * event notifications. * * @return true if the subscription needs to be approved by a node owner to become active. */ public boolean isAuthorizationPending() { return state == State.pending; } /** * Returns whether an entity wants to receive or has disabled notifications. * * @return true when notifications should be sent to the subscriber. */ public boolean shouldDeliverNotifications() { return deliverNotifications; } /** * Returns whether an entity wants to receive digests (aggregations) of * notifications or all notifications individually. * * @return true when an entity wants to receive digests (aggregations) of notifications. */ public boolean isUsingDigest() { return usingDigest; } /** * Returns the minimum number of milliseconds between sending any two notification digests. * Default is 24 hours. * * @return the minimum number of milliseconds between sending any two notification digests. */ public int getDigestFrequency() { return digestFrequency; } /** * Returns the Date at which a leased subscription will end or has ended. A value of * null means that the subscription will never expire. * * @return the Date at which a leased subscription will end or has ended. A value of * null means that the subscription will never expire. */ public Date getExpire() { return expire; } /** * Returns whether an entity wants to receive an XMPP message body in * addition to the payload format. * * @return true when an entity wants to receive an XMPP message body in * addition to the payload format */ public boolean isIncludingBody() { return includingBody; } /** * The presence states for which an entity wants to receive notifications. When the owner * is in any of the returned presence states then he is allowed to receive notifications. * * @return the presence states for which an entity wants to receive notifications. * (e.g. available, away, etc.) */ public Collection getPresenceStates() { return presenceStates; } /** * Returns if the owner has subscribed to receive notification of new items only * or of new nodes only. When subscribed to a Leaf Node then only items * is available. * * @return whether the owner has subscribed to receive notification of new items only * or of new nodes only. */ public Type getType() { return type; } /** * Returns 1 when the subscriber wants to receive notifications only from first-level * children of the collection. A value of 0 means that the subscriber wants to receive * notifications from all descendents. * * @return 1 when the subscriber wants to receive notifications only from first-level * children of the collection or 0 when notififying only from all descendents. */ public int getDepth() { return depth; } /** * Returns the keyword that the event needs to match. When null all event * are going to be notified to the subscriber. * * @return the keyword that the event needs to match. When null all event * are going to be notified to the subscriber. */ public String getKeyword() { return keyword; } void setShouldDeliverNotifications(boolean deliverNotifications) { this.deliverNotifications = deliverNotifications; } void setUsingDigest(boolean usingDigest) { this.usingDigest = usingDigest; } void setDigestFrequency(int digestFrequency) { this.digestFrequency = digestFrequency; } void setExpire(Date expire) { this.expire = expire; } void setIncludingBody(boolean includingBody) { this.includingBody = includingBody; } void setPresenceStates(Collection presenceStates) { this.presenceStates = presenceStates; } void setType(Type type) { this.type = type; } void setDepth(int depth) { this.depth = depth; } void setKeyword(String keyword) { this.keyword = keyword; } void setSavedToDB(boolean savedToDB) { this.savedToDB = savedToDB; } /** * Configures the subscription based on the sent {@link DataForm} included in the IQ * packet sent by the subscriber. If the subscription was pending of configuration * then the last published item is going to be sent to the subscriber.

* * The originalIQ parameter may be null when using this API internally. When no * IQ packet was sent then no IQ result will be sent to the sender. The rest of the * functionality is the same. * * @param originalIQ the IQ packet sent by the subscriber to configure his subscription or * null when using this API internally. * @param options the data form containing the new subscription configuration. */ public void configure(IQ originalIQ, DataForm options) { boolean wasUnconfigured = isConfigurationPending(); // Change the subscription configuration based on the completed form configure(options); if (originalIQ != null) { // Return success response node.getService().send(IQ.createResultIQ(originalIQ)); } if (wasUnconfigured) { // If subscription is pending then send notification to node owners // asking to approve the now configured subscription if (isAuthorizationPending()) { sendAuthorizationRequest(); } // Send last published item (if node is leaf node and subscription status is ok) if (node.isSendItemSubscribe() && isActive()) { PublishedItem lastItem = node.getLastPublishedItem(); if (lastItem != null) { sendLastPublishedItem(lastItem); } } } } void configure(DataForm options) { List values; String booleanValue; boolean wasUsingPresence = !presenceStates.isEmpty(); // Remove this field from the form options.removeField("FORM_TYPE"); // Process and remove specific collection node fields FormField collectionField = options.getField("pubsub#subscription_type"); if (collectionField != null) { values = collectionField.getValues(); if (values.size() > 0) { type = Type.valueOf(values.get(0)); } options.removeField("pubsub#subscription_type"); } collectionField = options.getField("pubsub#subscription_depth"); if (collectionField != null) { values = collectionField.getValues(); depth = "all".equals(values.get(0)) ? 0 : 1; options.removeField("pubsub#subscription_depth"); } // If there are more fields in the form then process them and set that // the subscription has been configured for (FormField field : options.getFields()) { boolean fieldExists = true; if ("pubsub#deliver".equals(field.getVariable())) { values = field.getValues(); booleanValue = (values.size() > 0 ? values.get(0) : "1"); deliverNotifications = "1".equals(booleanValue); } else if ("pubsub#digest".equals(field.getVariable())) { values = field.getValues(); booleanValue = (values.size() > 0 ? values.get(0) : "1"); usingDigest = "1".equals(booleanValue); } else if ("pubsub#digest_frequency".equals(field.getVariable())) { values = field.getValues(); digestFrequency = values.size() > 0 ? Integer.parseInt(values.get(0)) : 86400000; } else if ("pubsub#expire".equals(field.getVariable())) { values = field.getValues(); try { expire = xmppDateTime.parseString(values.get(0)); } catch (ParseException e) { Log.error("Error parsing date", e); } } else if ("pubsub#include_body".equals(field.getVariable())) { values = field.getValues(); booleanValue = (values.size() > 0 ? values.get(0) : "1"); includingBody = "1".equals(booleanValue); } else if ("pubsub#show-values".equals(field.getVariable())) { // Get the new list of presence states for which an entity wants to // receive notifications presenceStates = new ArrayList<>(); for (String value : field.getValues()) { try { presenceStates.add(value); } catch (Exception e) { // Do nothing } } } else if ("x-pubsub#keywords".equals(field.getVariable())) { values = field.getValues(); keyword = values.isEmpty() ? null : values.get(0); } else { fieldExists = false; } if (fieldExists) { // Subscription has been configured so set the next state if (node.getAccessModel().isAuthorizationRequired() && !node.isAdmin(owner)) { state = State.pending; } else { state = State.subscribed; } } } if (savedToDB) { // Update the subscription in the backend store PubSubPersistenceManager.saveSubscription(node, this, false); } // Check if the service needs to subscribe or unsubscribe from the owner presence if (!node.isPresenceBasedDelivery() && wasUsingPresence != !presenceStates.isEmpty()) { if (presenceStates.isEmpty()) { node.getService().presenceSubscriptionNotRequired(node, owner); } else { node.getService().presenceSubscriptionRequired(node, owner); } } } /** * Returns a data form with the subscription configuration. The data form can be used to * edit the subscription configuration. * * @return data form used by the subscriber to edit the subscription configuration. */ public DataForm getConfigurationForm() { DataForm form = new DataForm(DataForm.Type.form); form.setTitle(LocaleUtils.getLocalizedString("pubsub.form.subscription.title")); List params = new ArrayList<>(); params.add(node.getNodeID()); form.addInstruction(LocaleUtils.getLocalizedString("pubsub.form.subscription.instruction", params)); // Add the form fields and configure them for edition FormField formField = form.addField(); formField.setVariable("FORM_TYPE"); formField.setType(FormField.Type.hidden); formField.addValue("http://jabber.org/protocol/pubsub#subscribe_options"); formField = form.addField(); formField.setVariable("pubsub#deliver"); formField.setType(FormField.Type.boolean_type); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.deliver")); formField.addValue(deliverNotifications); formField = form.addField(); formField.setVariable("pubsub#digest"); formField.setType(FormField.Type.boolean_type); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.digest")); formField.addValue(usingDigest); formField = form.addField(); formField.setVariable("pubsub#digest_frequency"); formField.setType(FormField.Type.text_single); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.digest_frequency")); formField.addValue(digestFrequency); formField = form.addField(); formField.setVariable("pubsub#expire"); formField.setType(FormField.Type.text_single); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.expire")); if (expire != null) { formField.addValue(XMPPDateTimeFormat.format(expire)); } formField = form.addField(); formField.setVariable("pubsub#include_body"); formField.setType(FormField.Type.boolean_type); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.include_body")); formField.addValue(includingBody); formField = form.addField(); formField.setVariable("pubsub#show-values"); formField.setType(FormField.Type.list_multi); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.show-values")); formField.addOption(null, Presence.Show.away.name()); formField.addOption(null, Presence.Show.chat.name()); formField.addOption(null, Presence.Show.dnd.name()); formField.addOption(null, "online"); formField.addOption(null, Presence.Show.xa.name()); for (String value : presenceStates) { formField.addValue(value); } if (node.isCollectionNode()) { formField = form.addField(); formField.setVariable("pubsub#subscription_type"); formField.setType(FormField.Type.list_single); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.subscription_type")); formField.addOption(null, Type.items.name()); formField.addOption(null, Type.nodes.name()); formField.addValue(type); formField = form.addField(); formField.setVariable("pubsub#subscription_depth"); formField.setType(FormField.Type.list_single); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.subscription_depth")); formField.addOption(null, "1"); formField.addOption(null, "all"); formField.addValue(depth == 1 ? "1" : "all"); } if (!node.isCollectionNode() || type == Type.items) { formField = form.addField(); formField.setVariable("x-pubsub#keywords"); formField.setType(FormField.Type.text_single); formField.setLabel(LocaleUtils.getLocalizedString("pubsub.form.subscription.keywords")); if (keyword != null) { formField.addValue(keyword); } } return form; } /** * Returns true if an event notification can be sent to the subscriber for the specified * published item based on the subsription configuration and subscriber status. * * @param leafNode the node that received the publication. * @param publishedItem the published item to send or null if the publication didn't * contain an item. * @return true if an event notification can be sent to the subscriber for the specified * published item. */ public boolean canSendPublicationEvent(LeafNode leafNode, PublishedItem publishedItem) { if (!canSendEvents()) { return false; } // Check that any defined keyword was matched (applies only if an item was published) if (publishedItem != null && !isKeywordMatched(publishedItem)) { return false; } // Check special conditions when subscribed to collection node if (node.isCollectionNode()) { // Check if not subscribe to items if (Type.items != type) { return false; } // Check if published node is a first-level child of the subscribed node if (getDepth() == 1 && !node.isChildNode(leafNode)) { return false; } // Check if published node is a descendant child of the subscribed node if (getDepth() == 0 && !node.isDescendantNode(leafNode)) { return false; } } return true; } /** * Returns true if an event notification can be sent to the subscriber of the collection * node for a newly created node that was associated to the collection node or a child * node that was deleted. The subscription has to be of type {@link Type#nodes}. * * @param originatingNode the node that was added or deleted from the collection node. * @return true if an event notification can be sent to the subscriber of the collection * node. */ boolean canSendChildNodeEvent(Node originatingNode) { // Check that this is a subscriber to a collection node if (!node.isCollectionNode()) { return false; } if (!canSendEvents()) { return false; } // Check that subscriber is using type "nodes" if (Type.nodes != type) { return false; } // Check if added/deleted node is a first-level child of the subscribed node if (getDepth() == 1 && !node.isChildNode(originatingNode)) { return false; } // Check if added/deleted node is a descendant child of the subscribed node if (getDepth() == 0 && !node.isDescendantNode(originatingNode)) { return false; } return true; } /** * Returns true if node events such as configuration changed or node purged can be * sent to the subscriber. * * @return true if node events such as configuration changed or node purged can be * sent to the subscriber. */ boolean canSendNodeEvents() { return canSendEvents(); } /** * Returns true if events in general can be sent. This method checks basic * conditions common to all type of event notifications (e.g. item was published, * node configuration has changed, new child node was added to collection node, etc.). * * @return true if events in general can be sent. */ private boolean canSendEvents() { // Check if the subscription is active if (!isActive()) { return false; } // Check if delivery of notifications is disabled if (!shouldDeliverNotifications()) { return false; } // Check if delivery is subject to presence-based policy if (!getPresenceStates().isEmpty()) { Collection shows = node.getService().getShowPresences(jid); if (shows.isEmpty() || Collections.disjoint(getPresenceStates(), shows)) { return false; } } // Check if node is only sending events when user is online if (node.isPresenceBasedDelivery()) { // Check that user is online if (node.getService().getShowPresences(jid).isEmpty()) { return false; } } return true; } /** * Returns true if the published item matches the keyword filter specified in * the subscription. If no keyword was specified then answer true. * * @param publishedItem the published item to send. * @return true if the published item matches the keyword filter specified in * the subscription. */ boolean isKeywordMatched(PublishedItem publishedItem) { // Check if keyword was defined and it was not matched if (keyword != null && keyword.length() > 0 && !publishedItem.containsKeyword(keyword)) { return false; } return true; } /** * Returns true if the subscription is active. A subscription is considered active if it * has not expired, it has been approved and configured. * * @return true if the subscription is active. */ public boolean isActive() { // Check if subscription is approved and configured (if required) if (state != State.subscribed) { return false; } // Check if the subscription has expired if (expire != null && new Date().after(expire)) { // TODO This checking does not replace the fact that we need to implement expiration. // TODO A thread that checks expired subscriptions and removes them is needed. return false; } return true; } /** * Sends the current subscription status to the user that tried to create a subscription to * the node. The subscription status is sent to the subsciber after the subscription was * created or if the subscriber tries to subscribe many times and the node does not support * multpiple subscriptions. * * @param originalRequest the IQ packet sent by the subscriber to create the subscription. */ void sendSubscriptionState(IQ originalRequest) { IQ result = IQ.createResultIQ(originalRequest); Element child = result.setChildElement("pubsub", "http://jabber.org/protocol/pubsub"); Element entity = child.addElement("subscription"); if (!node.isRootCollectionNode()) { entity.addAttribute("node", node.getNodeID()); } entity.addAttribute("jid", getJID().toString()); if (node.isMultipleSubscriptionsEnabled()) { entity.addAttribute("subid", getID()); } entity.addAttribute("subscription", getState().name()); Element subscribeOptions = entity.addElement("subscribe-options"); if (node.isSubscriptionConfigurationRequired() && isConfigurationPending()) { subscribeOptions.addElement("required"); } // Send the result node.getService().send(result); } /** * Sends an event notification for the last published item to the subscriber. If * the subscription has not yet been authorized or is pending to be configured then * no notification is going to be sent.

* * Depending on the subscription configuration the event notification may or may not have * a payload, may not be sent if a keyword (i.e. filter) was defined and it was not matched. * *

Sending the last published item can also be entirely disabled by setting * xmpp.pubsub.disable-delayed-delivery to .

* * @param publishedItem the last item that was published to the node. */ void sendLastPublishedItem(PublishedItem publishedItem) { // Check to see if we've been disabled if (JiveGlobals.getBooleanProperty("xmpp.pubsub.disable-delayed-delivery", false)) { return; } // Check if the published item can be sent to the subscriber if (!canSendPublicationEvent(publishedItem.getNode(), publishedItem)) { return; } // Send event notification to the subscriber Message notification = new Message(); Element event = notification.getElement() .addElement("event", "http://jabber.org/protocol/pubsub#event"); Element items = event.addElement("items"); items.addAttribute("node", node.getNodeID()); Element item = items.addElement("item"); if (((LeafNode) node).isItemRequired()) { item.addAttribute("id", publishedItem.getID()); } if (node.isPayloadDelivered() && publishedItem.getPayload() != null) { item.add(publishedItem.getPayload().createCopy()); } // Add a message body (if required) if (isIncludingBody()) { notification.setBody(LocaleUtils.getLocalizedString("pubsub.notification.message.body")); } // Include date when published item was created notification.getElement().addElement("delay", "urn:xmpp:delay") .addAttribute("stamp", XMPPDateTimeFormat.format(publishedItem.getCreationDate())); // Send the event notification to the subscriber node.getService().sendNotification(node, notification, jid); } /** * Returns true if the specified user is allowed to modify or cancel the subscription. Users * that are allowed to modify/cancel the subscription are: the entity that is recieving the * notifications, the owner of the subscriptions or sysadmins of the pubsub service. * * @param user the user that is trying to cancel the subscription. * @return true if the specified user is allowed to modify or cancel the subscription. */ boolean canModify(JID user) { return user.equals(getJID()) || user.equals(getOwner()) || node.getService().isServiceAdmin(user); } /** * Returns the {@link NodeAffiliate} that owns this subscription. Users that have a * subscription with the node will ALWAYS have an affiliation even if the * affiliation is of type none. * * @return the NodeAffiliate that owns this subscription. */ public NodeAffiliate getAffiliate() { return node.getAffiliate(getOwner()); } @Override public String toString() { return super.toString() + " - JID: " + getJID() + " - State: " + getState().name(); } /** * The subscription has been approved by a node owner. The subscription is now active so * the subscriber is now allowed to get event notifications. */ void approved() { if (state == State.subscribed) { // Do nothing return; } state = State.subscribed; if (savedToDB) { // Update the subscription in the backend store PubSubPersistenceManager.saveSubscription(node, this, false); } // Send last published item (if node is leaf node and subscription status is ok) if (node.isSendItemSubscribe() && isActive()) { PublishedItem lastItem = node.getLastPublishedItem(); if (lastItem != null) { sendLastPublishedItem(lastItem); } } } /** * Sends an request to authorize the pending subscription to the specified owner. * * @param owner the JID of the user that will get the authorization request. */ public void sendAuthorizationRequest(JID owner) { Message authRequest = new Message(); authRequest.addExtension(node.getAuthRequestForm(this)); authRequest.setTo(owner); authRequest.setFrom(node.getService().getAddress()); // Send authentication request to node owners node.getService().send(authRequest); } /** * Sends an request to authorize the pending subscription to all owners. The first * answer sent by a owner will be processed. Rest of the answers will be discarded. */ public void sendAuthorizationRequest() { Message authRequest = new Message(); authRequest.addExtension(node.getAuthRequestForm(this)); // Send authentication request to node owners node.getService().broadcast(node, authRequest, node.getOwners()); } /** * Subscriptions to a node may exist in several states. Delivery of event notifications * varies according to the subscription state of the user with the node. */ public static enum State { /** * The node will never send event notifications or payloads to users in this state. Users * with subscription state none and affiliation none are going to be deleted. */ none, /** * An entity has requested to subscribe to a node and the request has not yet been * approved by a node owner. The node will not send event notifications or payloads * to the entity while it is in this state. */ pending, /** * An entity has subscribed but its subscription options have not yet been configured. * The node will send event notifications or payloads to the entity while it is in this * state. Default subscription configuration is going to be assumed. */ unconfigured, /** * An entity is subscribed to a node. The node will send all event notifications * (and, if configured, payloads) to the entity while it is in this state. */ subscribed } public static enum Type { /** * Receive notification of new items only. */ items, /** * Receive notification of new nodes only. */ nodes } }




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