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      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 
     33 namespace buzz {
     34 
     35 static bool IsUtf8FirstByte(int c) {
     36   return (((c)&0x80)==0) || // is single byte
     37     ((unsigned char)((c)-0xc0)<0x3e); // or is lead byte
     38 }
     39 
     40 PresenceReceiveTask::PresenceReceiveTask(XmppTaskParentInterface* parent)
     41  : XmppTask(parent, XmppEngine::HL_TYPE) {
     42 }
     43 
     44 PresenceReceiveTask::~PresenceReceiveTask() {
     45   Stop();
     46 }
     47 
     48 int 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 
     60 bool 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 
     72 void 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 
     83 void 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