citadel/modules/jabber/xmpp_presence.c

   1 /*
   2  * $Id$
   3  *
   4  * Handle XMPP presence exchanges
   5  *
   6  * Copyright (c) 2007 by Art Cancro
   7  * This code is released under the terms of the GNU General Public License.
   8  *
   9  */
  10
  11 #include "sysdep.h"
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <stdio.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <pwd.h>
  18 #include <errno.h>
  19 #include <sys/types.h>
  20
  21 #if TIME_WITH_SYS_TIME
  22 # include <sys/time.h>
  23 # include <time.h>
  24 #else
  25 # if HAVE_SYS_TIME_H
  26 #  include <sys/time.h>
  27 # else
  28 #  include <time.h>
  29 # endif
  30 #endif
  31
  32 #include <sys/wait.h>
  33 #include <string.h>
  34 #include <limits.h>
  35 #include <ctype.h>
  36 #include <expat.h>
  37 #include <libcitadel.h>
  38 #include "citadel.h"
  39 #include "server.h"
  40 #include "citserver.h"
  41 #include "support.h"
  42 #include "config.h"
  43 #include "internet_addressing.h"
  44 #include "md5.h"
  45 #include "ctdl_module.h"
  46 #include "serv_xmpp.h"
  47
  48
  49 /*
  50  * Initial dump of the entire wholist
  51  */
  52 void jabber_wholist_presence_dump(void)
  53 {
  54         struct CitContext *cptr = NULL;
  55         int nContexts, i;
  56
  57         int aide = (CC->user.axlevel >= 6);
  58
  59         cptr = CtdlGetContextArray(&nContexts);
  60         if (!cptr)
  61                 return ; /** FIXME: Does jabber need to send something to maintain the protocol?  */
  62
  63         for (i=0; i<nContexts; i++) {
  64                 if (cptr[i].logged_in) {
  65                         if (
  66                                 (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))  /* aides see everyone */
  67                                 && (cptr[i].user.usernum != CC->user.usernum)   /* don't show myself */
  68                                 && (cptr[i].can_receive_im)                     /* IM-capable session */
  69                            ) {
  70                                 cprintf("<presence type=\"available\" from=\"%s\"></presence>",
  71                                         cptr[i].cs_inet_email);
  72                         }
  73                 }
  74         }
  75         free(cptr);
  76 }
  77
  78
  79
  80 /*
  81  * When a user logs in or out of the local Citadel system, notify all Jabber sessions
  82  * about it.
  83  */
  84 void xmpp_presence_notify(char *presence_jid, int event_type) {
  85         struct CitContext *cptr;
  86         static int unsolicited_id;
  87         int visible_sessions = 0;
  88         int nContexts, i;
  89         int aide = (CC->user.axlevel >= 6);
  90
  91         if (IsEmptyStr(presence_jid)) return;
  92
  93         cptr = CtdlGetContextArray(&nContexts);
  94         if (!cptr)
  95                 return ; /** FIXME: Does jabber need to send something to maintain the protocol?  */
  96
  97         /* Count the visible sessions for this user */
  98         for (i=0; i<nContexts; i++) {
  99                 if (cptr[i].logged_in) {
 100                         if (
 101                                 (!strcasecmp(cptr[i].cs_inet_email, presence_jid))
 102                                 && (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))
 103                                 && (cptr[i].can_receive_im)
 104                         ) {
 105                                 ++visible_sessions;
 106                         }
 107                 }
 108         }
 109
 110         CtdlLogPrintf(CTDL_DEBUG, "%d sessions for <%s> are now visible to session %d\n",
 111                 visible_sessions, presence_jid, CC->cs_pid);
 112
 113         if ( (event_type == XMPP_EVT_LOGIN) && (visible_sessions == 1) ) {
 114
 115                 CtdlLogPrintf(CTDL_DEBUG, "Telling session %d that <%s> logged in\n", CC->cs_pid, presence_jid);
 116
 117                 /* Do an unsolicited roster update that adds a new contact. */
 118                 for (i=0; i<nContexts; i++) {
 119                         if (cptr[i].logged_in) {
 120                                 if (!strcasecmp(cptr[i].cs_inet_email, presence_jid)) {
 121                                         cprintf("<iq id=\"unsolicited_%x\" type=\"result\">",
 122                                                 ++unsolicited_id);
 123                                         cprintf("<query xmlns=\"jabber:iq:roster\">");
 124                                         jabber_roster_item(&cptr[i]);
 125                                         cprintf("</query>"
 126                                                 "</iq>");
 127                                 }
 128                         }
 129                 }
 130
 131                 /* Transmit presence information */
 132                 cprintf("<presence type=\"available\" from=\"%s\"></presence>", presence_jid);
 133         }
 134
 135         if (visible_sessions == 0) {
 136                 CtdlLogPrintf(CTDL_DEBUG, "Telling session %d that <%s> logged out\n", CC->cs_pid, presence_jid);
 137
 138                 /* Transmit non-presence information */
 139                 cprintf("<presence type=\"unavailable\" from=\"%s\"></presence>", presence_jid);
 140                 cprintf("<presence type=\"unsubscribed\" from=\"%s\"></presence>", presence_jid);
 141
 142                 /* Do an unsolicited roster update that deletes the contact. */
 143                 cprintf("<iq id=\"unsolicited_%x\" type=\"result\">", ++unsolicited_id);
 144                 cprintf("<query xmlns=\"jabber:iq:roster\">");
 145                 cprintf("<item jid=\"%s\" subscription=\"remove\">", presence_jid);
 146                 cprintf("<group>%s</group>", config.c_humannode);
 147                 cprintf("</item>");
 148                 cprintf("</query>"
 149                         "</iq>");
 150         }
 151         free(cptr);
 152 }