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/*
* libjingle
* Copyright 2011, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/xmpp/pubsubtasks.h"
#include <string>
#include <vector>
#include "talk/xmpp/constants.h"
#include "talk/xmpp/receivetask.h"
// An implementation of the tasks for XEP-0060
// (http://xmpp.org/extensions/xep-0060.html).
namespace buzz {
namespace {
bool IsPubSubEventItemsElem(const XmlElement* stanza,
const std::string& expected_node) {
if (stanza->Name() != QN_MESSAGE) {
return false;
}
const XmlElement* event_elem = stanza->FirstNamed(QN_PUBSUB_EVENT);
if (event_elem == NULL) {
return false;
}
const XmlElement* items_elem = event_elem->FirstNamed(QN_PUBSUB_EVENT_ITEMS);
if (items_elem == NULL) {
return false;
}
const std::string& actual_node = items_elem->Attr(QN_NODE);
return (actual_node == expected_node);
}
// Creates <pubsub node="node"><items></pubsub>
XmlElement* CreatePubSubItemsElem(const std::string& node) {
XmlElement* items_elem = new XmlElement(QN_PUBSUB_ITEMS, false);
items_elem->AddAttr(QN_NODE, node);
XmlElement* pubsub_elem = new XmlElement(QN_PUBSUB, false);
pubsub_elem->AddElement(items_elem);
return pubsub_elem;
}
// Creates <pubsub node="node"><publish><item id="itemid">payload</item>...
// Takes ownership of payload.
XmlElement* CreatePubSubPublishItemElem(
const std::string& node,
const std::string& itemid,
const std::vector<XmlElement*>& children) {
XmlElement* pubsub_elem = new XmlElement(QN_PUBSUB, true);
XmlElement* publish_elem = new XmlElement(QN_PUBSUB_PUBLISH, false);
publish_elem->AddAttr(QN_NODE, node);
XmlElement* item_elem = new XmlElement(QN_PUBSUB_ITEM, false);
item_elem->AddAttr(QN_ID, itemid);
for (std::vector<XmlElement*>::const_iterator child = children.begin();
child != children.end(); ++child) {
item_elem->AddElement(*child);
}
publish_elem->AddElement(item_elem);
pubsub_elem->AddElement(publish_elem);
return pubsub_elem;
}
// Creates <pubsub node="node"><publish><item id="itemid">payload</item>...
// Takes ownership of payload.
XmlElement* CreatePubSubRetractItemElem(const std::string& node,
const std::string& itemid) {
XmlElement* pubsub_elem = new XmlElement(QN_PUBSUB, true);
XmlElement* retract_elem = new XmlElement(QN_PUBSUB_RETRACT, false);
retract_elem->AddAttr(QN_NODE, node);
retract_elem->AddAttr(QN_NOTIFY, "true");
XmlElement* item_elem = new XmlElement(QN_PUBSUB_ITEM, false);
item_elem->AddAttr(QN_ID, itemid);
retract_elem->AddElement(item_elem);
pubsub_elem->AddElement(retract_elem);
return pubsub_elem;
}
void ParseItem(const XmlElement* item_elem,
std::vector<PubSubItem>* items) {
PubSubItem item;
item.itemid = item_elem->Attr(QN_ID);
item.elem = item_elem;
items->push_back(item);
}
// Right now, <retract>s are treated the same as items with empty
// payloads. We may want to change it in the future, but right now
// it's sufficient for our needs.
void ParseRetract(const XmlElement* retract_elem,
std::vector<PubSubItem>* items) {
ParseItem(retract_elem, items);
}
void ParseEventItemsElem(const XmlElement* stanza,
std::vector<PubSubItem>* items) {
const XmlElement* event_elem = stanza->FirstNamed(QN_PUBSUB_EVENT);
if (event_elem != NULL) {
const XmlElement* items_elem =
event_elem->FirstNamed(QN_PUBSUB_EVENT_ITEMS);
if (items_elem != NULL) {
for (const XmlElement* item_elem =
items_elem->FirstNamed(QN_PUBSUB_EVENT_ITEM);
item_elem != NULL;
item_elem = item_elem->NextNamed(QN_PUBSUB_EVENT_ITEM)) {
ParseItem(item_elem, items);
}
for (const XmlElement* retract_elem =
items_elem->FirstNamed(QN_PUBSUB_EVENT_RETRACT);
retract_elem != NULL;
retract_elem = retract_elem->NextNamed(QN_PUBSUB_EVENT_RETRACT)) {
ParseRetract(retract_elem, items);
}
}
}
}
void ParsePubSubItemsElem(const XmlElement* stanza,
std::vector<PubSubItem>* items) {
const XmlElement* pubsub_elem = stanza->FirstNamed(QN_PUBSUB);
if (pubsub_elem != NULL) {
const XmlElement* items_elem = pubsub_elem->FirstNamed(QN_PUBSUB_ITEMS);
if (items_elem != NULL) {
for (const XmlElement* item_elem = items_elem->FirstNamed(QN_PUBSUB_ITEM);
item_elem != NULL;
item_elem = item_elem->NextNamed(QN_PUBSUB_ITEM)) {
ParseItem(item_elem, items);
}
}
}
}
} // namespace
PubSubRequestTask::PubSubRequestTask(XmppTaskParentInterface* parent,
const Jid& pubsubjid,
const std::string& node)
: IqTask(parent, STR_GET, pubsubjid, CreatePubSubItemsElem(node)) {
}
void PubSubRequestTask::HandleResult(const XmlElement* stanza) {
std::vector<PubSubItem> items;
ParsePubSubItemsElem(stanza, &items);
SignalResult(this, items);
}
int PubSubReceiveTask::ProcessStart() {
if (SignalUpdate.is_empty()) {
return STATE_DONE;
}
return ReceiveTask::ProcessStart();
}
bool PubSubReceiveTask::WantsStanza(const XmlElement* stanza) {
return MatchStanzaFrom(stanza, pubsubjid_) &&
IsPubSubEventItemsElem(stanza, node_) && !SignalUpdate.is_empty();
}
void PubSubReceiveTask::ReceiveStanza(const XmlElement* stanza) {
std::vector<PubSubItem> items;
ParseEventItemsElem(stanza, &items);
SignalUpdate(this, items);
}
PubSubPublishTask::PubSubPublishTask(XmppTaskParentInterface* parent,
const Jid& pubsubjid,
const std::string& node,
const std::string& itemid,
const std::vector<XmlElement*>& children)
: IqTask(parent, STR_SET, pubsubjid,
CreatePubSubPublishItemElem(node, itemid, children)),
itemid_(itemid) {
}
void PubSubPublishTask::HandleResult(const XmlElement* stanza) {
SignalResult(this);
}
PubSubRetractTask::PubSubRetractTask(XmppTaskParentInterface* parent,
const Jid& pubsubjid,
const std::string& node,
const std::string& itemid)
: IqTask(parent, STR_SET, pubsubjid,
CreatePubSubRetractItemElem(node, itemid)),
itemid_(itemid) {
}
void PubSubRetractTask::HandleResult(const XmlElement* stanza) {
SignalResult(this);
}
} // namespace buzz
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