Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmpp/pubsubtasks.cc

+/*
+ *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/libjingle/xmpp/pubsubtasks.h"
+
+#include <string>
+#include <vector>
+
+#include "webrtc/libjingle/xmpp/constants.h"
+#include "webrtc/libjingle/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