citadel/modules/xmpp/xmpp_presence.c

   1 /*
   2  * $Id$
   3  *
   4  * Handle XMPP presence exchanges
   5  *
   6  * Copyright (c) 2007-2009 by Art Cancro
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include "sysdep.h"
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <pwd.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <sys/wait.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <ctype.h>
  49 #include <expat.h>
  50 #include <libcitadel.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55 #include "config.h"
  56 #include "internet_addressing.h"
  57 #include "md5.h"
  58 #include "ctdl_module.h"
  59 #include "serv_xmpp.h"
  60
  61
  62 /*
  63  * Initial dump of the entire wholist
  64  */
  65 void xmpp_wholist_presence_dump(void)
  66 {
  67         struct CitContext *cptr = NULL;
  68         int nContexts, i;
  69
  70         int aide = (CC->user.axlevel >= 6);
  71
  72         cptr = CtdlGetContextArray(&nContexts);
  73         if (!cptr)
  74                 return ; /** FIXME: Does xmpp need to send something to maintain the protocol?  */
  75
  76         for (i=0; i<nContexts; i++) {
  77                 if (cptr[i].logged_in) {
  78                         if (
  79                                 (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))  /* aides see everyone */
  80                                 && (cptr[i].user.usernum != CC->user.usernum)   /* don't show myself */
  81                                 && (cptr[i].can_receive_im)                     /* IM-capable session */
  82                            ) {
  83                                 cprintf("<presence type=\"available\" from=\"%s\"></presence>",
  84                                         cptr[i].cs_inet_email);
  85                         }
  86                 }
  87         }
  88         free(cptr);
  89 }
  90
  91
  92
  93 /*
  94  * When a user logs in or out of the local Citadel system, notify all XMPP sessions about it.
  95  */
  96 void xmpp_presence_notify(char *presence_jid, int event_type) {
  97         struct CitContext *cptr;
  98         static int unsolicited_id;
  99         int visible_sessions = 0;
 100         int nContexts, i;
 101         int aide = (CC->user.axlevel >= 6);
 102
 103         if (IsEmptyStr(presence_jid)) return;
 104
 105         cptr = CtdlGetContextArray(&nContexts);
 106         if (!cptr)
 107                 return ; /** FIXME: Does XMPP need to send something to maintain the protocol?  */
 108
 109         /* Count the visible sessions for this user */
 110         for (i=0; i<nContexts; i++) {
 111                 if (cptr[i].logged_in) {
 112                         if (
 113                                 (!strcasecmp(cptr[i].cs_inet_email, presence_jid))
 114                                 && (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))
 115                                 && (cptr[i].can_receive_im)
 116                         ) {
 117                                 ++visible_sessions;
 118                         }
 119                 }
 120         }
 121
 122         CtdlLogPrintf(CTDL_DEBUG, "%d sessions for <%s> are now visible to session %d\n",
 123                 visible_sessions, presence_jid, CC->cs_pid);
 124
 125         if ( (event_type == XMPP_EVT_LOGIN) && (visible_sessions == 1) ) {
 126
 127                 CtdlLogPrintf(CTDL_DEBUG, "Telling session %d that <%s> logged in\n", CC->cs_pid, presence_jid);
 128
 129                 /* Do an unsolicited roster update that adds a new contact. */
 130                 for (i=0; i<nContexts; i++) {
 131                         if (cptr[i].logged_in) {
 132                                 if (!strcasecmp(cptr[i].cs_inet_email, presence_jid)) {
 133                                         cprintf("<iq id=\"unsolicited_%x\" type=\"result\">",
 134                                                 ++unsolicited_id);
 135                                         cprintf("<query xmlns=\"jabber:iq:roster\">");
 136                                         xmpp_roster_item(&cptr[i]);
 137                                         cprintf("</query>"
 138                                                 "</iq>");
 139                                 }
 140                         }
 141                 }
 142
 143                 /* Transmit presence information */
 144                 cprintf("<presence type=\"available\" from=\"%s\"></presence>", presence_jid);
 145         }
 146
 147         if (visible_sessions == 0) {
 148                 CtdlLogPrintf(CTDL_DEBUG, "Telling session %d that <%s> logged out\n", CC->cs_pid, presence_jid);
 149
 150                 /* Transmit non-presence information */
 151                 cprintf("<presence type=\"unavailable\" from=\"%s\"></presence>", presence_jid);
 152                 cprintf("<presence type=\"unsubscribed\" from=\"%s\"></presence>", presence_jid);
 153
 154                 /* Do an unsolicited roster update that deletes the contact. */
 155                 cprintf("<iq id=\"unsolicited_%x\" type=\"result\">", ++unsolicited_id);
 156                 cprintf("<query xmlns=\"jabber:iq:roster\">");
 157                 cprintf("<item jid=\"%s\" subscription=\"remove\">", presence_jid);
 158                 cprintf("<group>%s</group>", config.c_humannode);
 159                 cprintf("</item>");
 160                 cprintf("</query>"
 161                         "</iq>");
 162         }
 163         free(cptr);
 164 }