purple_sip.c

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/* OpenSER PURPLE MODULE
 * 
 * Copyright (C) 2008 Atos Worldline
 * Contact: Eric PTAK <eric.ptak@atosorigin.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#include <stdlib.h>
#include <string.h>
#include <libxml/parser.h>

#include "../../dprint.h"
#include "../../str.h"
#include "../tm/tm_load.h"
#include "../pua/pua_bind.h"
#include "../pua/pidf.h"

#include "purple.h"
#include "purple_sip.h"

extern struct tm_binds tmb;
extern send_publish_t pua_send_publish;

/* Relay a MESSAGE to a SIP client */
int purple_send_sip_msg(char *to, char *from, char *msg) {
   LM_DBG("sending message from %s to %s\n", from, to);
   str msg_type = { "MESSAGE", 7 };
   str ruri, hdr, fromstr, tostr, msgstr;
   char hdr_buf[512], ruri_buf[512];
   
   ruri.s = ruri_buf;
   ruri.len = snprintf(ruri_buf, sizeof(ruri_buf), "%s;proto=purple", to);
   
   hdr.s = hdr_buf;
   hdr.len = snprintf(hdr_buf, sizeof(hdr_buf), "Content-type: text/plain" CRLF "Contact: %s" CRLF, from);

   fromstr.s = from;
   fromstr.len = strlen(from);
   tostr.s = to;
   tostr.len = strlen(to);
   msgstr.s = msg;
   msgstr.len = strlen(msg);

   if (tmb.t_request(&msg_type, &ruri, &tostr, &fromstr, &hdr, &msgstr, 0, 0, 0) < 0) {
      LM_ERR("error sending request\n");
      return -1;
   }
   LM_DBG("message sent successfully\n");
   return 0;
}

static str* build_pidf(char *uri, char *id, enum purple_publish_basic basic, enum purple_publish_activity activity, const char *note) {
   LM_DBG("build pidf : %s, %d, %d, %s\n", uri, basic, activity, note);
   str* body = NULL;
   xmlDocPtr doc = NULL;
   xmlNodePtr root_node = NULL, status_node = NULL;
   xmlNodePtr tuple_node = NULL, basic_node = NULL;
   xmlNodePtr person_node = NULL, activities_node = NULL;
   xmlNsPtr pidf_ns, dm_ns, rpid_ns, cipid_ns;
   char* entity = NULL;

   entity = (char*)pkg_malloc(7+ strlen(uri)*sizeof(char));
   if(entity == NULL) { 
      LM_ERR("no more memory\n");
      goto error;
   }
   strcpy(entity, "pres:");
   memcpy(entity+5, uri+4, strlen(uri)-4);
   entity[1+ strlen(uri)] = '\0';
   LM_DBG("building pidf for entity: %s\n", entity);

   doc = xmlNewDoc(BAD_CAST "1.0");
   if(doc == NULL) {
      LM_ERR("allocating new xml doc\n");
      goto error;
   }

   root_node = xmlNewNode(NULL, BAD_CAST "presence");
   if(root_node == 0) {
      LM_ERR("extracting presence node\n");
      goto error;
   }
   xmlDocSetRootElement(doc, root_node);
   xmlNewProp(root_node, BAD_CAST "entity", BAD_CAST entity);

   pidf_ns = xmlNewNs(root_node, BAD_CAST "urn:ietf:params:xml:ns:pidf", NULL);
   dm_ns = xmlNewNs(root_node, BAD_CAST "urn:ietf:params:xml:ns:pidf:data-model", BAD_CAST "dm");
   rpid_ns = xmlNewNs(root_node, BAD_CAST "urn:ietf:params:xml:ns:pidf:rpid", BAD_CAST "rpid");
   cipid_ns = xmlNewNs(root_node, BAD_CAST "urn:ietf:params:xml:ns:pidf:cipid", BAD_CAST "c");
   
   tuple_node = xmlNewChild(root_node, NULL, BAD_CAST "tuple", NULL);
   if( tuple_node == NULL) {
      LM_ERR("while adding child\n");
      goto error;
   }
   xmlNewProp(tuple_node, BAD_CAST "id", BAD_CAST id);
   
   status_node = xmlNewChild(tuple_node, pidf_ns, BAD_CAST "status", NULL);
   if( status_node ==NULL) {
      LM_ERR("while adding child\n");
      goto error;
   }

   switch (basic) {
      case PURPLE_BASIC_OPEN:
         basic_node = xmlNewChild(status_node, pidf_ns, BAD_CAST "basic", BAD_CAST "open");
         if(basic_node == NULL) {
            LM_ERR("while adding child\n");
            goto error;
         }
         break;

      case PURPLE_BASIC_CLOSED:  
         basic_node = xmlNewChild(status_node, pidf_ns, BAD_CAST "basic", BAD_CAST "closed") ;
         if(basic_node == NULL) {
            LM_ERR("while adding child\n");
            goto error;
         }
         break;
      default:
         break;
   }
      
   person_node = xmlNewChild(root_node, dm_ns, BAD_CAST "person", NULL);
   if (person_node == NULL) {
      LM_ERR("while adding child\n");
      goto error;
   }
   xmlNewProp(person_node, BAD_CAST "id", BAD_CAST id);

   activities_node = xmlNewChild(person_node, rpid_ns, BAD_CAST "activities", NULL);
   if (activities_node == NULL) {
      LM_ERR("while adding child\n");
      goto error;
   }
   
   switch (activity) {
      case PURPLE_ACTIVITY_AVAILABLE:
         xmlNewChild(activities_node, rpid_ns, BAD_CAST "unknown", NULL);
         xmlNewChild(person_node, dm_ns, BAD_CAST "note", (note != NULL) ? BAD_CAST note : NULL);
         break;
      case PURPLE_ACTIVITY_BUSY:
         xmlNewChild(activities_node, rpid_ns, BAD_CAST "busy", NULL);
         xmlNewChild(activities_node, rpid_ns, BAD_CAST "unknown", NULL);
         if (note == NULL)
            xmlNewChild(person_node, dm_ns, BAD_CAST "note", BAD_CAST "Busy");
         break;
      case PURPLE_ACTIVITY_AWAY:
         xmlNewChild(activities_node, rpid_ns, BAD_CAST "away", NULL);
         xmlNewChild(activities_node, rpid_ns, BAD_CAST "unknown", NULL);
         if (note == NULL)
            xmlNewChild(person_node, dm_ns, BAD_CAST "note", BAD_CAST "Away");
         break;
      default:
         break;
   }  

   if (note != NULL)
      xmlNewChild(person_node, dm_ns, BAD_CAST "note", BAD_CAST note);
      
      
   body = (str*)pkg_malloc(sizeof(str));
   if(body == NULL) {
      LM_ERR("no more memory\n");
      goto error;
   }
   xmlDocDumpFormatMemory(doc, (xmlChar**)(void*)&body->s, &body->len, 1);
      
   if(entity)
      pkg_free(entity);
   xmlFreeDoc(doc);
   
   return body;

error:
   if(entity)
      pkg_free(entity);
   if(body) {
      if(body->s) {
         xmlFree(body->s);
      }
      pkg_free(body);
   }
   if(doc) {
      xmlFreeDoc(doc);
   }

   return NULL;
}  


/* Relay a PUBLISH */
int purple_send_sip_publish(char *from, char *tupleid, enum purple_publish_basic basic, enum purple_publish_activity primitive, const char *note) {

   LM_DBG("publishing presence for <%s> with tuple [%s]\n", from, tupleid);
   
   char pres_buff[512];
   publ_info_t publ;

   memset(&publ, 0, sizeof(publ_info_t));
   
   str pres_uri;
   pres_uri.s = pres_buff;
   pres_uri.len = sprintf(pres_buff, "%s;proto=purple", from);

   publ.pres_uri = &pres_uri;
   publ.source_flag = PURPLE_PUBLISH;
   publ.event = PRESENCE_EVENT;

   str *body = NULL;
   if (basic == PURPLE_BASIC_OPEN) {
      body = build_pidf(from, tupleid, basic, primitive, note);
      publ.expires = 3600; 
   }
   else {
      publ.body = NULL;
      publ.expires = 0;
   }

   publ.body = body; 

   if(pua_send_publish(&publ) < 0) {
      LM_ERR("error while sending publish\n");
      return -1;
   }
   LM_DBG("publish sent successfully for <%s>\n", from);
   return 0;
}