1/*
2 * libjingle
3 * Copyright 2004--2012, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "talk/xmpp/presencereceivetask.h"
29
30#include "talk/base/stringencode.h"
31#include "talk/xmpp/constants.h"
32
33namespace buzz {
34
35static bool IsUtf8FirstByte(int c) {
36  return (((c)&0x80)==0) || // is single byte
37    ((unsigned char)((c)-0xc0)<0x3e); // or is lead byte
38}
39
40PresenceReceiveTask::PresenceReceiveTask(XmppTaskParentInterface* parent)
41 : XmppTask(parent, XmppEngine::HL_TYPE) {
42}
43
44PresenceReceiveTask::~PresenceReceiveTask() {
45  Stop();
46}
47
48int PresenceReceiveTask::ProcessStart() {
49  const XmlElement * stanza = NextStanza();
50  if (stanza == NULL) {
51    return STATE_BLOCKED;
52  }
53
54  Jid from(stanza->Attr(QN_FROM));
55  HandlePresence(from, stanza);
56
57  return STATE_START;
58}
59
60bool PresenceReceiveTask::HandleStanza(const XmlElement * stanza) {
61  // Verify that this is a presence stanze
62  if (stanza->Name() != QN_PRESENCE) {
63    return false; // not sure if this ever happens.
64  }
65
66  // Queue it up
67  QueueStanza(stanza);
68
69  return true;
70}
71
72void PresenceReceiveTask::HandlePresence(const Jid& from,
73                                         const XmlElement* stanza) {
74  if (stanza->Attr(QN_TYPE) == STR_ERROR) {
75    return;
76  }
77
78  PresenceStatus status;
79  DecodeStatus(from, stanza, &status);
80  PresenceUpdate(status);
81}
82
83void PresenceReceiveTask::DecodeStatus(const Jid& from,
84                                       const XmlElement* stanza,
85                                       PresenceStatus* presence_status) {
86  presence_status->set_jid(from);
87  if (stanza->Attr(QN_TYPE) == STR_UNAVAILABLE) {
88    presence_status->set_available(false);
89  } else {
90    presence_status->set_available(true);
91    const XmlElement * status_elem = stanza->FirstNamed(QN_STATUS);
92    if (status_elem != NULL) {
93      presence_status->set_status(status_elem->BodyText());
94
95      // Truncate status messages longer than 300 bytes
96      if (presence_status->status().length() > 300) {
97        size_t len = 300;
98
99        // Be careful not to split legal utf-8 chars in half
100        while (!IsUtf8FirstByte(presence_status->status()[len]) && len > 0) {
101          len -= 1;
102        }
103        std::string truncated(presence_status->status(), 0, len);
104        presence_status->set_status(truncated);
105      }
106    }
107
108    const XmlElement * priority = stanza->FirstNamed(QN_PRIORITY);
109    if (priority != NULL) {
110      int pri;
111      if (talk_base::FromString(priority->BodyText(), &pri)) {
112        presence_status->set_priority(pri);
113      }
114    }
115
116    const XmlElement * show = stanza->FirstNamed(QN_SHOW);
117    if (show == NULL || show->FirstChild() == NULL) {
118      presence_status->set_show(PresenceStatus::SHOW_ONLINE);
119    } else if (show->BodyText() == "away") {
120      presence_status->set_show(PresenceStatus::SHOW_AWAY);
121    } else if (show->BodyText() == "xa") {
122      presence_status->set_show(PresenceStatus::SHOW_XA);
123    } else if (show->BodyText() == "dnd") {
124      presence_status->set_show(PresenceStatus::SHOW_DND);
125    } else if (show->BodyText() == "chat") {
126      presence_status->set_show(PresenceStatus::SHOW_CHAT);
127    } else {
128      presence_status->set_show(PresenceStatus::SHOW_ONLINE);
129    }
130
131    const XmlElement * caps = stanza->FirstNamed(QN_CAPS_C);
132    if (caps != NULL) {
133      std::string node = caps->Attr(QN_NODE);
134      std::string ver = caps->Attr(QN_VER);
135      std::string exts = caps->Attr(QN_EXT);
136
137      presence_status->set_know_capabilities(true);
138      presence_status->set_caps_node(node);
139      presence_status->set_version(ver);
140    }
141
142    const XmlElement* delay = stanza->FirstNamed(kQnDelayX);
143    if (delay != NULL) {
144      // Ideally we would parse this according to the Psuedo ISO-8601 rules
145      // that are laid out in JEP-0082:
146      // http://www.jabber.org/jeps/jep-0082.html
147      std::string stamp = delay->Attr(kQnStamp);
148      presence_status->set_sent_time(stamp);
149    }
150
151    const XmlElement* nick = stanza->FirstNamed(QN_NICKNAME);
152    if (nick) {
153      presence_status->set_nick(nick->BodyText());
154    }
155  }
156}
157
158} // namespace buzz
159