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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, 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 <vector>
     29 #include <algorithm>
     30 #include "talk/base/common.h"
     31 #include "talk/xmpp/xmppengineimpl.h"
     32 #include "talk/xmpp/constants.h"
     33 
     34 namespace buzz {
     35 
     36 class XmppIqEntry {
     37   XmppIqEntry(const std::string & id, const std::string & to,
     38                XmppEngine * pxce, XmppIqHandler * iq_handler) :
     39     id_(id),
     40     to_(to),
     41     engine_(pxce),
     42     iq_handler_(iq_handler) {
     43   }
     44 
     45 private:
     46   friend class XmppEngineImpl;
     47 
     48   const std::string id_;
     49   const std::string to_;
     50   XmppEngine * const engine_;
     51   XmppIqHandler * const iq_handler_;
     52 };
     53 
     54 
     55 XmppReturnStatus
     56 XmppEngineImpl::SendIq(const XmlElement * element, XmppIqHandler * iq_handler,
     57   XmppIqCookie* cookie) {
     58   if (state_ == STATE_CLOSED)
     59     return XMPP_RETURN_BADSTATE;
     60   if (NULL == iq_handler)
     61     return XMPP_RETURN_BADARGUMENT;
     62   if (!element || element->Name() != QN_IQ)
     63     return XMPP_RETURN_BADARGUMENT;
     64 
     65   const std::string& type = element->Attr(QN_TYPE);
     66   if (type != "get" && type != "set")
     67     return XMPP_RETURN_BADARGUMENT;
     68 
     69   if (!element->HasAttr(QN_ID))
     70     return XMPP_RETURN_BADARGUMENT;
     71   const std::string& id = element->Attr(QN_ID);
     72 
     73   XmppIqEntry * iq_entry = new XmppIqEntry(id,
     74                                               element->Attr(QN_TO),
     75                                               this, iq_handler);
     76   iq_entries_->push_back(iq_entry);
     77   SendStanza(element);
     78 
     79   if (cookie)
     80     *cookie = iq_entry;
     81 
     82   return XMPP_RETURN_OK;
     83 }
     84 
     85 
     86 XmppReturnStatus
     87 XmppEngineImpl::RemoveIqHandler(XmppIqCookie cookie,
     88     XmppIqHandler ** iq_handler) {
     89 
     90   std::vector<XmppIqEntry*, std::allocator<XmppIqEntry*> >::iterator pos;
     91 
     92   pos = std::find(iq_entries_->begin(),
     93                   iq_entries_->end(),
     94                   reinterpret_cast<XmppIqEntry*>(cookie));
     95 
     96   if (pos == iq_entries_->end())
     97     return XMPP_RETURN_BADARGUMENT;
     98 
     99   XmppIqEntry* entry = *pos;
    100   iq_entries_->erase(pos);
    101   if (iq_handler)
    102     *iq_handler = entry->iq_handler_;
    103   delete entry;
    104 
    105   return XMPP_RETURN_OK;
    106 }
    107 
    108 void
    109 XmppEngineImpl::DeleteIqCookies() {
    110   for (size_t i = 0; i < iq_entries_->size(); i += 1) {
    111     XmppIqEntry * iq_entry_ = (*iq_entries_)[i];
    112     (*iq_entries_)[i] = NULL;
    113     delete iq_entry_;
    114   }
    115   iq_entries_->clear();
    116 }
    117 
    118 static void
    119 AecImpl(XmlElement * error_element, const QName & name,
    120         const char * type, const char * code) {
    121   error_element->AddElement(new XmlElement(QN_ERROR));
    122   error_element->AddAttr(QN_CODE, code, 1);
    123   error_element->AddAttr(QN_TYPE, type, 1);
    124   error_element->AddElement(new XmlElement(name, true), 1);
    125 }
    126 
    127 
    128 static void
    129 AddErrorCode(XmlElement * error_element, XmppStanzaError code) {
    130   switch (code) {
    131     case XSE_BAD_REQUEST:
    132       AecImpl(error_element, QN_STANZA_BAD_REQUEST, "modify", "400");
    133       break;
    134     case XSE_CONFLICT:
    135       AecImpl(error_element, QN_STANZA_CONFLICT, "cancel", "409");
    136       break;
    137     case XSE_FEATURE_NOT_IMPLEMENTED:
    138       AecImpl(error_element, QN_STANZA_FEATURE_NOT_IMPLEMENTED,
    139               "cancel", "501");
    140       break;
    141     case XSE_FORBIDDEN:
    142       AecImpl(error_element, QN_STANZA_FORBIDDEN, "auth", "403");
    143       break;
    144     case XSE_GONE:
    145       AecImpl(error_element, QN_STANZA_GONE, "modify", "302");
    146       break;
    147     case XSE_INTERNAL_SERVER_ERROR:
    148       AecImpl(error_element, QN_STANZA_INTERNAL_SERVER_ERROR, "wait", "500");
    149       break;
    150     case XSE_ITEM_NOT_FOUND:
    151       AecImpl(error_element, QN_STANZA_ITEM_NOT_FOUND, "cancel", "404");
    152       break;
    153     case XSE_JID_MALFORMED:
    154       AecImpl(error_element, QN_STANZA_JID_MALFORMED, "modify", "400");
    155       break;
    156     case XSE_NOT_ACCEPTABLE:
    157       AecImpl(error_element, QN_STANZA_NOT_ACCEPTABLE, "cancel", "406");
    158       break;
    159     case XSE_NOT_ALLOWED:
    160       AecImpl(error_element, QN_STANZA_NOT_ALLOWED, "cancel", "405");
    161       break;
    162     case XSE_PAYMENT_REQUIRED:
    163       AecImpl(error_element, QN_STANZA_PAYMENT_REQUIRED, "auth", "402");
    164       break;
    165     case XSE_RECIPIENT_UNAVAILABLE:
    166       AecImpl(error_element, QN_STANZA_RECIPIENT_UNAVAILABLE, "wait", "404");
    167       break;
    168     case XSE_REDIRECT:
    169       AecImpl(error_element, QN_STANZA_REDIRECT, "modify", "302");
    170       break;
    171     case XSE_REGISTRATION_REQUIRED:
    172       AecImpl(error_element, QN_STANZA_REGISTRATION_REQUIRED, "auth", "407");
    173       break;
    174     case XSE_SERVER_NOT_FOUND:
    175       AecImpl(error_element, QN_STANZA_REMOTE_SERVER_NOT_FOUND,
    176               "cancel", "404");
    177       break;
    178     case XSE_SERVER_TIMEOUT:
    179       AecImpl(error_element, QN_STANZA_REMOTE_SERVER_TIMEOUT, "wait", "502");
    180       break;
    181     case XSE_RESOURCE_CONSTRAINT:
    182       AecImpl(error_element, QN_STANZA_RESOURCE_CONSTRAINT, "wait", "500");
    183       break;
    184     case XSE_SERVICE_UNAVAILABLE:
    185       AecImpl(error_element, QN_STANZA_SERVICE_UNAVAILABLE, "cancel", "503");
    186       break;
    187     case XSE_SUBSCRIPTION_REQUIRED:
    188       AecImpl(error_element, QN_STANZA_SUBSCRIPTION_REQUIRED, "auth", "407");
    189       break;
    190     case XSE_UNDEFINED_CONDITION:
    191       AecImpl(error_element, QN_STANZA_UNDEFINED_CONDITION, "wait", "500");
    192       break;
    193     case XSE_UNEXPECTED_REQUEST:
    194       AecImpl(error_element, QN_STANZA_UNEXPECTED_REQUEST, "wait", "400");
    195       break;
    196   }
    197 }
    198 
    199 
    200 XmppReturnStatus
    201 XmppEngineImpl::SendStanzaError(const XmlElement * element_original,
    202                                 XmppStanzaError code,
    203                                 const std::string & text) {
    204 
    205   if (state_ == STATE_CLOSED)
    206     return XMPP_RETURN_BADSTATE;
    207 
    208   XmlElement error_element(element_original->Name());
    209   error_element.AddAttr(QN_TYPE, "error");
    210 
    211   // copy attrs, copy 'from' to 'to' and strip 'from'
    212   for (const XmlAttr * attribute = element_original->FirstAttr();
    213        attribute; attribute = attribute->NextAttr()) {
    214     QName name = attribute->Name();
    215     if (name == QN_TO)
    216       continue; // no need to put a from attr.  Server will stamp stanza
    217     else if (name == QN_FROM)
    218       name = QN_TO;
    219     else if (name == QN_TYPE)
    220       continue;
    221     error_element.AddAttr(name, attribute->Value());
    222   }
    223 
    224   // copy children
    225   for (const XmlChild * child = element_original->FirstChild();
    226        child;
    227        child = child->NextChild()) {
    228     if (child->IsText()) {
    229       error_element.AddText(child->AsText()->Text());
    230     } else {
    231       error_element.AddElement(new XmlElement(*(child->AsElement())));
    232     }
    233   }
    234 
    235   // add error information
    236   AddErrorCode(&error_element, code);
    237   if (text != STR_EMPTY) {
    238     XmlElement * text_element = new XmlElement(QN_STANZA_TEXT, true);
    239     text_element->AddText(text);
    240     error_element.AddElement(text_element);
    241   }
    242 
    243   SendStanza(&error_element);
    244 
    245   return XMPP_RETURN_OK;
    246 }
    247 
    248 
    249 bool
    250 XmppEngineImpl::HandleIqResponse(const XmlElement * element) {
    251   if (iq_entries_->empty())
    252     return false;
    253   if (element->Name() != QN_IQ)
    254     return false;
    255   std::string type = element->Attr(QN_TYPE);
    256   if (type != "result" && type != "error")
    257     return false;
    258   if (!element->HasAttr(QN_ID))
    259     return false;
    260   std::string id = element->Attr(QN_ID);
    261   std::string from = element->Attr(QN_FROM);
    262 
    263   for (std::vector<XmppIqEntry *>::iterator it = iq_entries_->begin();
    264        it != iq_entries_->end(); it += 1) {
    265     XmppIqEntry * iq_entry = *it;
    266     if (iq_entry->id_ == id && iq_entry->to_ == from) {
    267       iq_entries_->erase(it);
    268       iq_entry->iq_handler_->IqResponse(iq_entry, element);
    269       delete iq_entry;
    270       return true;
    271     }
    272   }
    273 
    274   return false;
    275 }
    276 
    277 }
    278