citadel/modules/calendar/serv_calendar.c

   1 /*
   2  * This module implements iCalendar object processing and the Calendar>
   3  * room on a Citadel server.  It handles iCalendar objects using the
   4  * iTIP protocol.  See RFCs 2445 and 2446.
   5  *
   6  *
   7  * Copyright (c) 1987-2011 by the citadel.org team
   8  *
   9  *  This program is open source software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 3 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #define PRODID "-//Citadel//NONSGML Citadel Calendar//EN"
  25
  26 #include "ctdl_module.h"
  27
  28 #include <libical/ical.h>
  29
  30 #include "msgbase.h"
  31 #include "internet_addressing.h"
  32 #include "serv_calendar.h"
  33 #include "euidindex.h"
  34 #include "ical_dezonify.h"
  35
  36
  37
  38 struct ical_respond_data {
  39         char desired_partnum[SIZ];
  40         icalcomponent *cal;
  41 };
  42
  43
  44 /*
  45  * Utility function to create a new VCALENDAR component with some of the
  46  * required fields already set the way we like them.
  47  */
  48 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  49         icalcomponent *encaps;
  50
  51         encaps = icalcomponent_new_vcalendar();
  52         if (encaps == NULL) {
  53                 syslog(LOG_CRIT, "ERROR: could not allocate component!\n");
  54                 return NULL;
  55         }
  56
  57         /* Set the Product ID */
  58         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  59
  60         /* Set the Version Number */
  61         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  62
  63         return(encaps);
  64 }
  65
  66
  67 /*
  68  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  69  */
  70 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  71         icalcomponent *encaps;
  72
  73         /* If we're already looking at a full VCALENDAR component,
  74          * don't bother ... just return itself.
  75          */
  76         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  77                 return subcomp;
  78         }
  79
  80         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  81         encaps = icalcomponent_new_citadel_vcalendar();
  82         if (encaps == NULL) return NULL;
  83
  84         /* Encapsulate the subcomponent inside */
  85         icalcomponent_add_component(encaps, subcomp);
  86
  87         /* Return the object we just created. */
  88         return(encaps);
  89 }
  90
  91
  92
  93
  94 /*
  95  * Write a calendar object into the specified user's calendar room.
  96  * If the supplied user is NULL, this function writes the calendar object
  97  * to the currently selected room.
  98  */
  99 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 100         char *ser = NULL;
 101         icalcomponent *encaps = NULL;
 102         struct CtdlMessage *msg = NULL;
 103         icalcomponent *tmp=NULL;
 104
 105         if (cal == NULL) return;
 106
 107         /* If the supplied object is a subcomponent, encapsulate it in
 108          * a full VCALENDAR component, and save that instead.
 109          */
 110         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 111                 tmp = icalcomponent_new_clone(cal);
 112                 encaps = ical_encapsulate_subcomponent(tmp);
 113                 ical_write_to_cal(u, encaps);
 114                 icalcomponent_free(tmp);
 115                 icalcomponent_free(encaps);
 116                 return;
 117         }
 118
 119         ser = icalcomponent_as_ical_string_r(cal);
 120         if (ser == NULL) return;
 121
 122         /* If the caller supplied a user, write to that user's default calendar room */
 123         if (u) {
 124                 /* This handy API function does all the work for us. */
 125                 CtdlWriteObject(USERCALENDARROOM,       /* which room */
 126                         "text/calendar",        /* MIME type */
 127                         ser,                    /* data */
 128                         strlen(ser)+1,          /* length */
 129                         u,                      /* which user */
 130                         0,                      /* not binary */
 131                         0,                      /* don't delete others of this type */
 132                         0                       /* no flags */
 133                 );
 134         }
 135
 136         /* If the caller did not supply a user, write to the currently selected room */
 137         if (!u) {
 138                 msg = malloc(sizeof(struct CtdlMessage));
 139                 memset(msg, 0, sizeof(struct CtdlMessage));
 140                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 141                 msg->cm_anon_type = MES_NORMAL;
 142                 msg->cm_format_type = 4;
 143                 msg->cm_fields['A'] = strdup(CC->user.fullname);
 144                 msg->cm_fields['O'] = strdup(CC->room.QRname);
 145                 msg->cm_fields['N'] = strdup(config.c_nodename);
 146                 msg->cm_fields['H'] = strdup(config.c_humannode);
 147                 msg->cm_fields['M'] = malloc(strlen(ser) + 40);
 148                 strcpy(msg->cm_fields['M'], "Content-type: text/calendar\r\n\r\n");
 149                 strcat(msg->cm_fields['M'], ser);
 150
 151                 /* Now write the data */
 152                 CtdlSubmitMsg(msg, NULL, "", QP_EADDR);
 153                 CtdlFreeMessage(msg);
 154         }
 155
 156         /* In either case, now we can free the serialized calendar object */
 157         free(ser);
 158 }
 159
 160
 161 /*
 162  * Send a reply to a meeting invitation.
 163  *
 164  * 'request' is the invitation to reply to.
 165  * 'action' is the string "accept" or "decline" or "tentative".
 166  *
 167  */
 168 void ical_send_a_reply(icalcomponent *request, char *action) {
 169         icalcomponent *the_reply = NULL;
 170         icalcomponent *vevent = NULL;
 171         icalproperty *attendee = NULL;
 172         char attendee_string[SIZ];
 173         icalproperty *organizer = NULL;
 174         char organizer_string[SIZ];
 175         icalproperty *summary = NULL;
 176         char summary_string[SIZ];
 177         icalproperty *me_attend = NULL;
 178         struct recptypes *recp = NULL;
 179         icalparameter *partstat = NULL;
 180         char *serialized_reply = NULL;
 181         char *reply_message_text = NULL;
 182         const char *ch;
 183         struct CtdlMessage *msg = NULL;
 184         struct recptypes *valid = NULL;
 185
 186         strcpy(organizer_string, "");
 187         strcpy(summary_string, "Calendar item");
 188
 189         if (request == NULL) {
 190                 syslog(LOG_ERR, "ERROR: trying to reply to NULL event?\n");
 191                 return;
 192         }
 193
 194         the_reply = icalcomponent_new_clone(request);
 195         if (the_reply == NULL) {
 196                 syslog(LOG_ERR, "ERROR: cannot clone request\n");
 197                 return;
 198         }
 199
 200         /* Change the method from REQUEST to REPLY */
 201         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 202
 203         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 204         if (vevent != NULL) {
 205                 /* Hunt for attendees, removing ones that aren't us.
 206                  * (Actually, remove them all, cloning our own one so we can
 207                  * re-insert it later)
 208                  */
 209                 while (attendee = icalcomponent_get_first_property(vevent,
 210                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 211                 ) {
 212                         ch = icalproperty_get_attendee(attendee);
 213                         if ((ch != NULL) && !strncasecmp(ch, "MAILTO:", 7)) {
 214                                 safestrncpy(attendee_string, ch + 7, sizeof (attendee_string));
 215                                 striplt(attendee_string);
 216                                 recp = validate_recipients(attendee_string, NULL, 0);
 217                                 if (recp != NULL) {
 218                                         if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 219                                                 if (me_attend) icalproperty_free(me_attend);
 220                                                 me_attend = icalproperty_new_clone(attendee);
 221                                         }
 222                                         free_recipients(recp);
 223                                 }
 224                         }
 225
 226                         /* Remove it... */
 227                         icalcomponent_remove_property(vevent, attendee);
 228                         icalproperty_free(attendee);
 229                 }
 230
 231                 /* We found our own address in the attendee list. */
 232                 if (me_attend) {
 233                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 234                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 235
 236                         if (!strcasecmp(action, "accept")) {
 237                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 238                         }
 239                         else if (!strcasecmp(action, "decline")) {
 240                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 241                         }
 242                         else if (!strcasecmp(action, "tentative")) {
 243                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 244                         }
 245
 246                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 247
 248                         /* Now insert it back into the vevent. */
 249                         icalcomponent_add_property(vevent, me_attend);
 250                 }
 251
 252                 /* Figure out who to send this thing to */
 253                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 254                 if (organizer != NULL) {
 255                         if (icalproperty_get_organizer(organizer)) {
 256                                 strcpy(organizer_string,
 257                                         icalproperty_get_organizer(organizer) );
 258                         }
 259                 }
 260                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 261                         strcpy(organizer_string, &organizer_string[7]);
 262                         striplt(organizer_string);
 263                 } else {
 264                         strcpy(organizer_string, "");
 265                 }
 266
 267                 /* Extract the summary string -- we'll use it as the
 268                  * message subject for the reply
 269                  */
 270                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 271                 if (summary != NULL) {
 272                         if (icalproperty_get_summary(summary)) {
 273                                 strcpy(summary_string,
 274                                         icalproperty_get_summary(summary) );
 275                         }
 276                 }
 277         }
 278
 279         /* Now generate the reply message and send it out. */
 280         serialized_reply = icalcomponent_as_ical_string_r(the_reply);
 281         icalcomponent_free(the_reply);  /* don't need this anymore */
 282         if (serialized_reply == NULL) return;
 283
 284         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 285         if (reply_message_text != NULL) {
 286                 sprintf(reply_message_text,
 287                         "Content-type: text/calendar; charset=\"utf-8\"\r\n\r\n%s\r\n",
 288                         serialized_reply
 289                 );
 290
 291                 msg = CtdlMakeMessage(&CC->user,
 292                         organizer_string,       /* to */
 293                         "",                     /* cc */
 294                         CC->room.QRname, 0, FMT_RFC822,
 295                         "",
 296                         "",
 297                         summary_string,         /* Use summary for subject */
 298                         NULL,
 299                         reply_message_text,
 300                         NULL);
 301
 302                 if (msg != NULL) {
 303                         valid = validate_recipients(organizer_string, NULL, 0);
 304                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
 305                         CtdlFreeMessage(msg);
 306                         free_recipients(valid);
 307                 }
 308         }
 309         free(serialized_reply);
 310 }
 311
 312
 313
 314 /*
 315  * Callback function for mime parser that hunts for calendar content types
 316  * and turns them into calendar objects.  If something is found, it is placed
 317  * in ird->cal, and the caller now owns that memory and is responsible for freeing it.
 318  */
 319 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 320                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 321                 char *cbid, void *cbuserdata) {
 322
 323         struct ical_respond_data *ird = NULL;
 324
 325         ird = (struct ical_respond_data *) cbuserdata;
 326
 327         /* desired_partnum can be set to "_HUNT_" to have it just look for
 328          * the first part with a content type of text/calendar.  Otherwise
 329          * we have to only process the right one.
 330          */
 331         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 332                 if (strcasecmp(partnum, ird->desired_partnum)) {
 333                         return;
 334                 }
 335         }
 336
 337         if (  (strcasecmp(cbtype, "text/calendar"))
 338            && (strcasecmp(cbtype, "application/ics")) ) {
 339                 return;
 340         }
 341
 342         if (ird->cal != NULL) {
 343                 icalcomponent_free(ird->cal);
 344                 ird->cal = NULL;
 345         }
 346
 347         ird->cal = icalcomponent_new_from_string(content);
 348 }
 349
 350
 351 /*
 352  * Respond to a meeting request.
 353  */
 354 void ical_respond(long msgnum, char *partnum, char *action) {
 355         struct CtdlMessage *msg = NULL;
 356         struct ical_respond_data ird;
 357
 358         if (
 359            (strcasecmp(action, "accept"))
 360            && (strcasecmp(action, "decline"))
 361         ) {
 362                 cprintf("%d Action must be 'accept' or 'decline'\n",
 363                         ERROR + ILLEGAL_VALUE
 364                 );
 365                 return;
 366         }
 367
 368         msg = CtdlFetchMessage(msgnum, 1);
 369         if (msg == NULL) {
 370                 cprintf("%d Message %ld not found.\n",
 371                         ERROR + ILLEGAL_VALUE,
 372                         (long)msgnum
 373                 );
 374                 return;
 375         }
 376
 377         memset(&ird, 0, sizeof ird);
 378         strcpy(ird.desired_partnum, partnum);
 379         mime_parser(msg->cm_fields['M'],
 380                 NULL,
 381                 *ical_locate_part,              /* callback function */
 382                 NULL, NULL,
 383                 (void *) &ird,                  /* user data */
 384                 0
 385         );
 386
 387         /* We're done with the incoming message, because we now have a
 388          * calendar object in memory.
 389          */
 390         CtdlFreeMessage(msg);
 391
 392         /*
 393          * Here is the real meat of this function.  Handle the event.
 394          */
 395         if (ird.cal != NULL) {
 396                 /* Save this in the user's calendar if necessary */
 397                 if (!strcasecmp(action, "accept")) {
 398                         ical_write_to_cal(&CC->user, ird.cal);
 399                 }
 400
 401                 /* Send a reply if necessary */
 402                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 403                         ical_send_a_reply(ird.cal, action);
 404                 }
 405
 406                 /* We used to delete the invitation after handling it.
 407                  * We don't do that anymore, but here is the code that handled it:
 408                  * CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 409                  */
 410
 411                 /* Free the memory we allocated and return a response. */
 412                 icalcomponent_free(ird.cal);
 413                 ird.cal = NULL;
 414                 cprintf("%d ok\n", CIT_OK);
 415                 return;
 416         }
 417         else {
 418                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 419                 return;
 420         }
 421
 422         /* should never get here */
 423 }
 424
 425
 426 /*
 427  * Figure out the UID of the calendar event being referred to in a
 428  * REPLY object.  This function is recursive.
 429  */
 430 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 431         icalcomponent *subcomponent;
 432         icalproperty *p;
 433
 434         /* If this object is a REPLY, then extract the UID. */
 435         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 436                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 437                 if (p != NULL) {
 438                         strcpy(uidbuf, icalproperty_get_comment(p));
 439                 }
 440         }
 441
 442         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 443          * UID of the reply; we want the UID of the invitation being replied to.
 444          */
 445         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 446             subcomponent != NULL;
 447             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 448                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 449         }
 450 }
 451
 452
 453 /*
 454  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 455  * locate the message containing the calendar event we're replying to, this function
 456  * gets called.  It basically just sticks the message number in a supplied buffer.
 457  */
 458 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 459         long *msgnumptr;
 460
 461         msgnumptr = (long *) data;
 462         *msgnumptr = msgnum;
 463 }
 464
 465
 466 struct original_event_container {
 467         icalcomponent *c;
 468 };
 469
 470 /*
 471  * Callback function for mime parser that hunts for calendar content types
 472  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 473  * to fetch the object being updated)
 474  */
 475 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 476                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 477                 char *cbid, void *cbuserdata) {
 478
 479         struct original_event_container *oec = NULL;
 480
 481         if (  (strcasecmp(cbtype, "text/calendar"))
 482            && (strcasecmp(cbtype, "application/ics")) ) {
 483                 return;
 484         }
 485         oec = (struct original_event_container *) cbuserdata;
 486         if (oec->c != NULL) {
 487                 icalcomponent_free(oec->c);
 488         }
 489         oec->c = icalcomponent_new_from_string(content);
 490 }
 491
 492
 493 /*
 494  * Merge updated attendee information from a REPLY into an existing event.
 495  */
 496 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 497         icalcomponent *c;
 498         icalproperty *e_attendee, *r_attendee;
 499
 500         /* First things first.  If we're not looking at a VEVENT component,
 501          * recurse through subcomponents until we find one.
 502          */
 503         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 504                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 505                     c != NULL;
 506                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 507                         ical_merge_attendee_reply(c, reply);
 508                 }
 509                 return;
 510         }
 511
 512         /* Now do the same thing with the reply.
 513          */
 514         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 515                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 516                     c != NULL;
 517                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 518                         ical_merge_attendee_reply(event, c);
 519                 }
 520                 return;
 521         }
 522
 523         /* Clone the reply, because we're going to rip its guts out. */
 524         reply = icalcomponent_new_clone(reply);
 525
 526         /* At this point we're looking at the correct subcomponents.
 527          * Iterate through the attendees looking for a match.
 528          */
 529 STARTOVER:
 530         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 531             e_attendee != NULL;
 532             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 533
 534                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 535                     r_attendee != NULL;
 536                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 537
 538                         /* Check to see if these two attendees match...
 539                          */
 540                         const char *e, *r;
 541                         e = icalproperty_get_attendee(e_attendee);
 542                         r = icalproperty_get_attendee(r_attendee);
 543
 544                         if ((e != NULL) &&
 545                             (r != NULL) &&
 546                             !strcasecmp(e, r)) {
 547                                 /* ...and if they do, remove the attendee from the event
 548                                  * and replace it with the attendee from the reply.  (The
 549                                  * reply's copy will have the same address, but an updated
 550                                  * status.)
 551                                  */
 552                                 icalcomponent_remove_property(event, e_attendee);
 553                                 icalproperty_free(e_attendee);
 554                                 icalcomponent_remove_property(reply, r_attendee);
 555                                 icalcomponent_add_property(event, r_attendee);
 556
 557                                 /* Since we diddled both sets of attendees, we have to start
 558                                  * the iteration over again.  This will not create an infinite
 559                                  * loop because we removed the attendee from the reply.  (That's
 560                                  * why we cloned the reply, and that's what we mean by "ripping
 561                                  * its guts out.")
 562                                  */
 563                                 goto STARTOVER;
 564                         }
 565
 566                 }
 567         }
 568
 569         /* Free the *clone* of the reply. */
 570         icalcomponent_free(reply);
 571 }
 572
 573
 574
 575
 576 /*
 577  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 578  * calendar event.  The object has already been deserialized for us; all
 579  * we have to do here is hunt for the event in our calendar, merge in the
 580  * updated attendee status, and save it again.
 581  *
 582  * This function returns 0 on success, 1 if the event was not found in the
 583  * user's calendar, or 2 if an internal error occurred.
 584  */
 585 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 586         char uid[SIZ];
 587         char hold_rm[ROOMNAMELEN];
 588         long msgnum_being_replaced = 0;
 589         struct CtdlMessage *msg = NULL;
 590         struct original_event_container oec;
 591         icalcomponent *original_event;
 592         char *serialized_event = NULL;
 593         char roomname[ROOMNAMELEN];
 594         char *message_text = NULL;
 595
 596         /* Figure out just what event it is we're dealing with */
 597         strcpy(uid, "--==<< InVaLiD uId >>==--");
 598         ical_learn_uid_of_reply(uid, cal);
 599         syslog(LOG_DEBUG, "UID of event being replied to is <%s>\n", uid);
 600
 601         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 602
 603         if (CtdlGetRoom(&CC->room, USERCALENDARROOM) != 0) {
 604                 CtdlGetRoom(&CC->room, hold_rm);
 605                 syslog(LOG_CRIT, "cannot get user calendar room\n");
 606                 return(2);
 607         }
 608
 609         /*
 610          * Look in the EUID index for a message with
 611          * the Citadel EUID set to the value we're looking for.  Since
 612          * Citadel always sets the message EUID to the iCalendar UID of
 613          * the event, this will work.
 614          */
 615         msgnum_being_replaced = CtdlLocateMessageByEuid(uid, &CC->room);
 616
 617         CtdlGetRoom(&CC->room, hold_rm);        /* return to saved room */
 618
 619         syslog(LOG_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 620         if (msgnum_being_replaced == 0) {
 621                 return(1);                      /* no calendar event found */
 622         }
 623
 624         /* Now we know the ID of the message containing the event being updated.
 625          * We don't actually have to delete it; that'll get taken care of by the
 626          * server when we save another event with the same UID.  This just gives
 627          * us the ability to load the event into memory so we can diddle the
 628          * attendees.
 629          */
 630         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 631         if (msg == NULL) {
 632                 return(2);                      /* internal error */
 633         }
 634         oec.c = NULL;
 635         mime_parser(msg->cm_fields['M'],
 636                 NULL,
 637                 *ical_locate_original_event,    /* callback function */
 638                 NULL, NULL,
 639                 &oec,                           /* user data */
 640                 0
 641         );
 642         CtdlFreeMessage(msg);
 643
 644         original_event = oec.c;
 645         if (original_event == NULL) {
 646                 syslog(LOG_ERR, "ERROR: Original_component is NULL.\n");
 647                 return(2);
 648         }
 649
 650         /* Merge the attendee's updated status into the event */
 651         ical_merge_attendee_reply(original_event, cal);
 652
 653         /* Serialize it */
 654         serialized_event = icalcomponent_as_ical_string_r(original_event);
 655         icalcomponent_free(original_event);     /* Don't need this anymore. */
 656         if (serialized_event == NULL) return(2);
 657
 658         CtdlMailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 659
 660         message_text = malloc(strlen(serialized_event) + SIZ);
 661         if (message_text != NULL) {
 662                 sprintf(message_text,
 663                         "Content-type: text/calendar; charset=\"utf-8\"\r\n\r\n%s\r\n",
 664                         serialized_event
 665                 );
 666
 667                 msg = CtdlMakeMessage(&CC->user,
 668                         "",                     /* No recipient */
 669                         "",                     /* No recipient */
 670                         roomname,
 671                         0, FMT_RFC822,
 672                         "",
 673                         "",
 674                         "",             /* no subject */
 675                         NULL,
 676                         message_text,
 677                         NULL);
 678
 679                 if (msg != NULL) {
 680                         CIT_ICAL->avoid_sending_invitations = 1;
 681                         CtdlSubmitMsg(msg, NULL, roomname, QP_EADDR);
 682                         CtdlFreeMessage(msg);
 683                         CIT_ICAL->avoid_sending_invitations = 0;
 684                 }
 685         }
 686         free(serialized_event);
 687         return(0);
 688 }
 689
 690
 691 /*
 692  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 693  * simply extracts the calendar object from the message, deserializes it, and
 694  * passes it up to ical_update_my_calendar_with_reply() for processing.
 695  */
 696 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 697         struct CtdlMessage *msg = NULL;
 698         struct ical_respond_data ird;
 699         int ret;
 700
 701         if (
 702            (strcasecmp(action, "update"))
 703            && (strcasecmp(action, "ignore"))
 704         ) {
 705                 cprintf("%d Action must be 'update' or 'ignore'\n",
 706                         ERROR + ILLEGAL_VALUE
 707                 );
 708                 return;
 709         }
 710
 711         msg = CtdlFetchMessage(msgnum, 1);
 712         if (msg == NULL) {
 713                 cprintf("%d Message %ld not found.\n",
 714                         ERROR + ILLEGAL_VALUE,
 715                         (long)msgnum
 716                 );
 717                 return;
 718         }
 719
 720         memset(&ird, 0, sizeof ird);
 721         strcpy(ird.desired_partnum, partnum);
 722         mime_parser(msg->cm_fields['M'],
 723                 NULL,
 724                 *ical_locate_part,              /* callback function */
 725                 NULL, NULL,
 726                 (void *) &ird,                  /* user data */
 727                 0
 728         );
 729
 730         /* We're done with the incoming message, because we now have a
 731          * calendar object in memory.
 732          */
 733         CtdlFreeMessage(msg);
 734
 735         /*
 736          * Here is the real meat of this function.  Handle the event.
 737          */
 738         if (ird.cal != NULL) {
 739                 /* Update the user's calendar if necessary */
 740                 if (!strcasecmp(action, "update")) {
 741                         ret = ical_update_my_calendar_with_reply(ird.cal);
 742                         if (ret == 0) {
 743                                 cprintf("%d Your calendar has been updated with this reply.\n",
 744                                         CIT_OK);
 745                         }
 746                         else if (ret == 1) {
 747                                 cprintf("%d This event does not exist in your calendar.\n",
 748                                         ERROR + FILE_NOT_FOUND);
 749                         }
 750                         else {
 751                                 cprintf("%d An internal error occurred.\n",
 752                                         ERROR + INTERNAL_ERROR);
 753                         }
 754                 }
 755                 else {
 756                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 757                 }
 758
 759                 /* Now that we've processed this message, we don't need it
 760                  * anymore.  So delete it.  (Don't do this anymore.)
 761                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 762                  */
 763
 764                 /* Free the memory we allocated and return a response. */
 765                 icalcomponent_free(ird.cal);
 766                 ird.cal = NULL;
 767                 return;
 768         }
 769         else {
 770                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 771                 return;
 772         }
 773
 774         /* should never get here */
 775 }
 776
 777
 778 /*
 779  * Search for a property in both the top level and in a VEVENT subcomponent
 780  */
 781 icalproperty *ical_ctdl_get_subprop(
 782                 icalcomponent *cal,
 783                 icalproperty_kind which_prop
 784 ) {
 785         icalproperty *p;
 786         icalcomponent *c;
 787
 788         p = icalcomponent_get_first_property(cal, which_prop);
 789         if (p == NULL) {
 790                 c = icalcomponent_get_first_component(cal,
 791                                                         ICAL_VEVENT_COMPONENT);
 792                 if (c != NULL) {
 793                         p = icalcomponent_get_first_property(c, which_prop);
 794                 }
 795         }
 796         return p;
 797 }
 798
 799
 800 /*
 801  * Check to see if two events overlap.  Returns nonzero if they do.
 802  * (This function is used in both Citadel and WebCit.  If you change it in
 803  * one place, change it in the other.  Better yet, put it in a library.)
 804  */
 805 int ical_ctdl_is_overlap(
 806                         struct icaltimetype t1start,
 807                         struct icaltimetype t1end,
 808                         struct icaltimetype t2start,
 809                         struct icaltimetype t2end
 810 ) {
 811         if (icaltime_is_null_time(t1start)) return(0);
 812         if (icaltime_is_null_time(t2start)) return(0);
 813
 814         /* if either event lacks end time, assume end = start */
 815         if (icaltime_is_null_time(t1end))
 816                 memcpy(&t1end, &t1start, sizeof(struct icaltimetype));
 817         else {
 818                 if (t1end.is_date && icaltime_compare(t1start, t1end)) {
 819                         /*
 820                          * the end date is non-inclusive so adjust it by one
 821                          * day because our test is inclusive, note that a day is
 822                          * not too much because we are talking about all day
 823                          * events
 824                          * if start = end we assume that nevertheless the whole
 825                          * day is meant
 826                          */
 827                         icaltime_adjust(&t1end, -1, 0, 0, 0);
 828                 }
 829         }
 830
 831         if (icaltime_is_null_time(t2end))
 832                 memcpy(&t2end, &t2start, sizeof(struct icaltimetype));
 833         else {
 834                 if (t2end.is_date && icaltime_compare(t2start, t2end)) {
 835                         icaltime_adjust(&t2end, -1, 0, 0, 0);
 836                 }
 837         }
 838
 839         /* First, check for all-day events */
 840         if (t1start.is_date || t2start.is_date) {
 841                 /* If event 1 ends before event 2 starts, we're in the clear. */
 842                 if (icaltime_compare_date_only(t1end, t2start) < 0) return(0);
 843
 844                 /* If event 2 ends before event 1 starts, we're also ok. */
 845                 if (icaltime_compare_date_only(t2end, t1start) < 0) return(0);
 846
 847                 return(1);
 848         }
 849
 850         /* syslog(LOG_DEBUG, "Comparing t1start %d:%d t1end %d:%d t2start %d:%d t2end %d:%d \n",
 851                 t1start.hour, t1start.minute, t1end.hour, t1end.minute,
 852                 t2start.hour, t2start.minute, t2end.hour, t2end.minute);
 853         */
 854
 855         /* Now check for overlaps using date *and* time. */
 856
 857         /* If event 1 ends before event 2 starts, we're in the clear. */
 858         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 859         /* syslog(LOG_DEBUG, "first passed\n"); */
 860
 861         /* If event 2 ends before event 1 starts, we're also ok. */
 862         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 863         /* syslog(LOG_DEBUG, "second passed\n"); */
 864
 865         /* Otherwise, they overlap. */
 866         return(1);
 867 }
 868
 869 /*
 870  * Phase 6 of "hunt for conflicts"
 871  * called by ical_conflicts_phase5()
 872  *
 873  * Now both the proposed and existing events have been boiled down to start and end times.
 874  * Check for overlap and output any conflicts.
 875  *
 876  * Returns nonzero if a conflict was reported.  This allows the caller to stop iterating.
 877  */
 878 int ical_conflicts_phase6(struct icaltimetype t1start,
 879                         struct icaltimetype t1end,
 880                         struct icaltimetype t2start,
 881                         struct icaltimetype t2end,
 882                         long existing_msgnum,
 883                         char *conflict_event_uid,
 884                         char *conflict_event_summary,
 885                         char *compare_uid)
 886 {
 887         int conflict_reported = 0;
 888
 889         /* debugging cruft *
 890         time_t tt;
 891         tt = icaltime_as_timet_with_zone(t1start, t1start.zone);
 892         syslog(LOG_DEBUG, "PROPOSED START: %s", ctime(&tt));
 893         tt = icaltime_as_timet_with_zone(t1end, t1end.zone);
 894         syslog(LOG_DEBUG, "  PROPOSED END: %s", ctime(&tt));
 895         tt = icaltime_as_timet_with_zone(t2start, t2start.zone);
 896         syslog(LOG_DEBUG, "EXISTING START: %s", ctime(&tt));
 897         tt = icaltime_as_timet_with_zone(t2end, t2end.zone);
 898         syslog(LOG_DEBUG, "  EXISTING END: %s", ctime(&tt));
 899         * debugging cruft */
 900
 901         /* compare and output */
 902
 903         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 904                 cprintf("%ld||%s|%s|%d|\n",
 905                         existing_msgnum,
 906                         conflict_event_uid,
 907                         conflict_event_summary,
 908                         (       ((strlen(compare_uid)>0)
 909                                 &&(!strcasecmp(compare_uid,
 910                                 conflict_event_uid))) ? 1 : 0
 911                         )
 912                 );
 913                 conflict_reported = 1;
 914         }
 915
 916         return(conflict_reported);
 917 }
 918
 919
 920
 921 /*
 922  * Phase 5 of "hunt for conflicts"
 923  * Called by ical_conflicts_phase4()
 924  *
 925  * We have the proposed event boiled down to start and end times.
 926  * Now check it against an existing event.
 927  */
 928 void ical_conflicts_phase5(struct icaltimetype t1start,
 929                         struct icaltimetype t1end,
 930                         icalcomponent *existing_event,
 931                         long existing_msgnum,
 932                         char *compare_uid)
 933 {
 934         char conflict_event_uid[SIZ];
 935         char conflict_event_summary[SIZ];
 936         struct icaltimetype t2start, t2end;
 937         icalproperty *p;
 938
 939         /* recur variables */
 940         icalproperty *rrule = NULL;
 941         struct icalrecurrencetype recur;
 942         icalrecur_iterator *ritr = NULL;
 943         struct icaldurationtype dur;
 944         int num_recur = 0;
 945
 946         /* initialization */
 947         strcpy(conflict_event_uid, "");
 948         strcpy(conflict_event_summary, "");
 949         t2start = icaltime_null_time();
 950         t2end = icaltime_null_time();
 951
 952         /* existing event stuff */
 953         p = ical_ctdl_get_subprop(existing_event, ICAL_DTSTART_PROPERTY);
 954         if (p == NULL) return;
 955         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 956         if (icaltime_is_utc(t2start)) {
 957                 t2start.zone = icaltimezone_get_utc_timezone();
 958         }
 959         else {
 960                 t2start.zone = icalcomponent_get_timezone(existing_event,
 961                         icalparameter_get_tzid(
 962                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
 963                         )
 964                 );
 965                 if (!t2start.zone) {
 966                         t2start.zone = get_default_icaltimezone();
 967                 }
 968         }
 969
 970         p = ical_ctdl_get_subprop(existing_event, ICAL_DTEND_PROPERTY);
 971         if (p != NULL) {
 972                 t2end = icalproperty_get_dtend(p);
 973
 974                 if (icaltime_is_utc(t2end)) {
 975                         t2end.zone = icaltimezone_get_utc_timezone();
 976                 }
 977                 else {
 978                         t2end.zone = icalcomponent_get_timezone(existing_event,
 979                                 icalparameter_get_tzid(
 980                                         icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
 981                                 )
 982                         );
 983                         if (!t2end.zone) {
 984                                 t2end.zone = get_default_icaltimezone();
 985                         }
 986                 }
 987                 dur = icaltime_subtract(t2end, t2start);
 988         }
 989
 990         rrule = ical_ctdl_get_subprop(existing_event, ICAL_RRULE_PROPERTY);
 991         if (rrule) {
 992                 recur = icalproperty_get_rrule(rrule);
 993                 ritr = icalrecur_iterator_new(recur, t2start);
 994         }
 995
 996         do {
 997                 p = ical_ctdl_get_subprop(existing_event, ICAL_UID_PROPERTY);
 998                 if (p != NULL) {
 999                         strcpy(conflict_event_uid, icalproperty_get_comment(p));
1000                 }
1001
1002                 p = ical_ctdl_get_subprop(existing_event, ICAL_SUMMARY_PROPERTY);
1003                 if (p != NULL) {
1004                         strcpy(conflict_event_summary, icalproperty_get_comment(p));
1005                 }
1006
1007                 if (ical_conflicts_phase6(t1start, t1end, t2start, t2end,
1008                    existing_msgnum, conflict_event_uid, conflict_event_summary, compare_uid))
1009                 {
1010                         num_recur = MAX_RECUR + 1;      /* force it out of scope, no need to continue */
1011                 }
1012
1013                 if (rrule) {
1014                         t2start = icalrecur_iterator_next(ritr);
1015                         if (!icaltime_is_null_time(t2end)) {
1016                                 const icaltimezone *hold_zone = t2end.zone;
1017                                 t2end = icaltime_add(t2start, dur);
1018                                 t2end.zone = hold_zone;
1019                         }
1020                         ++num_recur;
1021                 }
1022
1023                 if (icaltime_compare(t2start, t1end) < 0) {
1024                         num_recur = MAX_RECUR + 1;      /* force it out of scope */
1025                 }
1026
1027         } while ( (rrule) && (!icaltime_is_null_time(t2start)) && (num_recur < MAX_RECUR) );
1028         icalrecur_iterator_free(ritr);
1029 }
1030
1031
1032
1033
1034 /*
1035  * Phase 4 of "hunt for conflicts"
1036  * Called by ical_hunt_for_conflicts_backend()
1037  *
1038  * At this point we've got it boiled down to two icalcomponent events in memory.
1039  * If they conflict, output something to the client.
1040  */
1041 void ical_conflicts_phase4(icalcomponent *proposed_event,
1042                 icalcomponent *existing_event,
1043                 long existing_msgnum)
1044 {
1045         struct icaltimetype t1start, t1end;
1046         t1start = icaltime_null_time();
1047         t1end = icaltime_null_time();
1048         icalproperty *p;
1049         char compare_uid[SIZ];
1050
1051         /* recur variables */
1052         icalproperty *rrule = NULL;
1053         struct icalrecurrencetype recur;
1054         icalrecur_iterator *ritr = NULL;
1055         struct icaldurationtype dur;
1056         int num_recur = 0;
1057
1058         /* initialization */
1059         strcpy(compare_uid, "");
1060
1061         /* proposed event stuff */
1062
1063         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTSTART_PROPERTY);
1064         if (p == NULL) return;
1065         if (p != NULL) t1start = icalproperty_get_dtstart(p);
1066         if (icaltime_is_utc(t1start)) {
1067                 t1start.zone = icaltimezone_get_utc_timezone();
1068         }
1069         else {
1070                 t1start.zone = icalcomponent_get_timezone(proposed_event,
1071                         icalparameter_get_tzid(
1072                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
1073                         )
1074                 );
1075                 if (!t1start.zone) {
1076                         t1start.zone = get_default_icaltimezone();
1077                 }
1078         }
1079
1080         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTEND_PROPERTY);
1081         if (p != NULL) {
1082                 t1end = icalproperty_get_dtend(p);
1083
1084                 if (icaltime_is_utc(t1end)) {
1085                         t1end.zone = icaltimezone_get_utc_timezone();
1086                 }
1087                 else {
1088                         t1end.zone = icalcomponent_get_timezone(proposed_event,
1089                                 icalparameter_get_tzid(
1090                                         icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
1091                                 )
1092                         );
1093                         if (!t1end.zone) {
1094                                 t1end.zone = get_default_icaltimezone();
1095                         }
1096                 }
1097
1098                 dur = icaltime_subtract(t1end, t1start);
1099         }
1100
1101         rrule = ical_ctdl_get_subprop(proposed_event, ICAL_RRULE_PROPERTY);
1102         if (rrule) {
1103                 recur = icalproperty_get_rrule(rrule);
1104                 ritr = icalrecur_iterator_new(recur, t1start);
1105         }
1106
1107         p = ical_ctdl_get_subprop(proposed_event, ICAL_UID_PROPERTY);
1108         if (p != NULL) {
1109                 strcpy(compare_uid, icalproperty_get_comment(p));
1110         }
1111
1112         do {
1113                 ical_conflicts_phase5(t1start, t1end, existing_event, existing_msgnum, compare_uid);
1114
1115                 if (rrule) {
1116                         t1start = icalrecur_iterator_next(ritr);
1117                         if (!icaltime_is_null_time(t1end)) {
1118                                 const icaltimezone *hold_zone = t1end.zone;
1119                                 t1end = icaltime_add(t1start, dur);
1120                                 t1end.zone = hold_zone;
1121                         }
1122                         ++num_recur;
1123                 }
1124
1125         } while ( (rrule) && (!icaltime_is_null_time(t1start)) && (num_recur < MAX_RECUR) );
1126         icalrecur_iterator_free(ritr);
1127 }
1128
1129
1130
1131 /*
1132  * Phase 3 of "hunt for conflicts"
1133  * Called by ical_hunt_for_conflicts()
1134  */
1135 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
1136         icalcomponent *proposed_event;
1137         struct CtdlMessage *msg = NULL;
1138         struct ical_respond_data ird;
1139
1140         proposed_event = (icalcomponent *)data;
1141
1142         msg = CtdlFetchMessage(msgnum, 1);
1143         if (msg == NULL) return;
1144         memset(&ird, 0, sizeof ird);
1145         strcpy(ird.desired_partnum, "_HUNT_");
1146         mime_parser(msg->cm_fields['M'],
1147                 NULL,
1148                 *ical_locate_part,              /* callback function */
1149                 NULL, NULL,
1150                 (void *) &ird,                  /* user data */
1151                 0
1152         );
1153         CtdlFreeMessage(msg);
1154
1155         if (ird.cal == NULL) return;
1156
1157         ical_conflicts_phase4(proposed_event, ird.cal, msgnum);
1158         icalcomponent_free(ird.cal);
1159 }
1160
1161
1162
1163 /*
1164  * Phase 2 of "hunt for conflicts" operation.
1165  * At this point we have a calendar object which represents the VEVENT that
1166  * is proposed for addition to the calendar.  Now hunt through the user's
1167  * calendar room, and output zero or more existing VEVENTs which conflict
1168  * with this one.
1169  */
1170 void ical_hunt_for_conflicts(icalcomponent *cal) {
1171         char hold_rm[ROOMNAMELEN];
1172
1173         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1174
1175         if (CtdlGetRoom(&CC->room, USERCALENDARROOM) != 0) {
1176                 CtdlGetRoom(&CC->room, hold_rm);
1177                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
1178                 return;
1179         }
1180
1181         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
1182
1183         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1184                 NULL,
1185                 NULL,
1186                 ical_hunt_for_conflicts_backend,
1187                 (void *) cal
1188         );
1189
1190         cprintf("000\n");
1191         CtdlGetRoom(&CC->room, hold_rm);        /* return to saved room */
1192
1193 }
1194
1195
1196
1197 /*
1198  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1199  */
1200 void ical_conflicts(long msgnum, char *partnum) {
1201         struct CtdlMessage *msg = NULL;
1202         struct ical_respond_data ird;
1203
1204         msg = CtdlFetchMessage(msgnum, 1);
1205         if (msg == NULL) {
1206                 cprintf("%d Message %ld not found\n",
1207                         ERROR + ILLEGAL_VALUE,
1208                         (long)msgnum
1209                 );
1210                 return;
1211         }
1212
1213         memset(&ird, 0, sizeof ird);
1214         strcpy(ird.desired_partnum, partnum);
1215         mime_parser(msg->cm_fields['M'],
1216                 NULL,
1217                 *ical_locate_part,              /* callback function */
1218                 NULL, NULL,
1219                 (void *) &ird,                  /* user data */
1220                 0
1221         );
1222
1223         CtdlFreeMessage(msg);
1224
1225         if (ird.cal != NULL) {
1226                 ical_hunt_for_conflicts(ird.cal);
1227                 icalcomponent_free(ird.cal);
1228                 return;
1229         }
1230
1231         cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1232 }
1233
1234
1235
1236 /*
1237  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1238  *
1239  * fb                   The VFREEBUSY component to which we are appending
1240  * top_level_cal        The top-level VCALENDAR component which contains a VEVENT to be added
1241  */
1242 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *top_level_cal) {
1243         icalcomponent *cal;
1244         icalproperty *p;
1245         icalvalue *v;
1246         struct icalperiodtype this_event_period = icalperiodtype_null_period();
1247         icaltimetype dtstart = icaltime_null_time();
1248         icaltimetype dtend = icaltime_null_time();
1249
1250         /* recur variables */
1251         icalproperty *rrule = NULL;
1252         struct icalrecurrencetype recur;
1253         icalrecur_iterator *ritr = NULL;
1254         struct icaldurationtype dur;
1255         int num_recur = 0;
1256
1257         if (!top_level_cal) return;
1258
1259         /* Find the VEVENT component containing an event */
1260         cal = icalcomponent_get_first_component(top_level_cal, ICAL_VEVENT_COMPONENT);
1261         if (!cal) return;
1262
1263         /* If this event is not opaque, the user isn't publishing it as
1264          * busy time, so don't bother doing anything else.
1265          */
1266         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1267         if (p != NULL) {
1268                 v = icalproperty_get_value(p);
1269                 if (v != NULL) {
1270                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1271                                 return;
1272                         }
1273                 }
1274         }
1275
1276         /*
1277          * Now begin calculating the event start and end times.
1278          */
1279         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1280         if (!p) return;
1281         dtstart = icalproperty_get_dtstart(p);
1282
1283         if (icaltime_is_utc(dtstart)) {
1284                 dtstart.zone = icaltimezone_get_utc_timezone();
1285         }
1286         else {
1287                 dtstart.zone = icalcomponent_get_timezone(top_level_cal,
1288                         icalparameter_get_tzid(
1289                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
1290                         )
1291                 );
1292                 if (!dtstart.zone) {
1293                         dtstart.zone = get_default_icaltimezone();
1294                 }
1295         }
1296
1297         dtend = icalcomponent_get_dtend(cal);
1298         if (!icaltime_is_null_time(dtend)) {
1299                 dur = icaltime_subtract(dtend, dtstart);
1300         }
1301
1302         /* Is a recurrence specified?  If so, get ready to process it... */
1303         rrule = ical_ctdl_get_subprop(cal, ICAL_RRULE_PROPERTY);
1304         if (rrule) {
1305                 recur = icalproperty_get_rrule(rrule);
1306                 ritr = icalrecur_iterator_new(recur, dtstart);
1307         }
1308
1309         do {
1310                 /* Convert the DTSTART and DTEND properties to an icalperiod. */
1311                 this_event_period.start = dtstart;
1312
1313                 if (!icaltime_is_null_time(dtend)) {
1314                         this_event_period.end = dtend;
1315                 }
1316
1317                 /* Convert the timestamps to UTC.  It's ok to do this because we've already expanded
1318                  * recurrences and this data is never going to get used again.
1319                  */
1320                 this_event_period.start = icaltime_convert_to_zone(
1321                         this_event_period.start,
1322                         icaltimezone_get_utc_timezone()
1323                 );
1324                 this_event_period.end = icaltime_convert_to_zone(
1325                         this_event_period.end,
1326                         icaltimezone_get_utc_timezone()
1327                 );
1328
1329                 /* Now add it. */
1330                 icalcomponent_add_property(fb, icalproperty_new_freebusy(this_event_period));
1331
1332                 /* Make sure the DTSTART property of the freebusy *list* is set to
1333                  * the DTSTART property of the *earliest event*.
1334                  */
1335                 p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1336                 if (p == NULL) {
1337                         icalcomponent_set_dtstart(fb, this_event_period.start);
1338                 }
1339                 else {
1340                         if (icaltime_compare(this_event_period.start, icalcomponent_get_dtstart(fb)) < 0) {
1341                                 icalcomponent_set_dtstart(fb, this_event_period.start);
1342                         }
1343                 }
1344
1345                 /* Make sure the DTEND property of the freebusy *list* is set to
1346                  * the DTEND property of the *latest event*.
1347                  */
1348                 p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1349                 if (p == NULL) {
1350                         icalcomponent_set_dtend(fb, this_event_period.end);
1351                 }
1352                 else {
1353                         if (icaltime_compare(this_event_period.end, icalcomponent_get_dtend(fb)) > 0) {
1354                                 icalcomponent_set_dtend(fb, this_event_period.end);
1355                         }
1356                 }
1357
1358                 if (rrule) {
1359                         dtstart = icalrecur_iterator_next(ritr);
1360                         if (!icaltime_is_null_time(dtend)) {
1361                                 dtend = icaltime_add(dtstart, dur);
1362                                 dtend.zone = dtstart.zone;
1363                                 dtend.is_utc = dtstart.is_utc;
1364                         }
1365                         ++num_recur;
1366                 }
1367
1368         } while ( (rrule) && (!icaltime_is_null_time(dtstart)) && (num_recur < MAX_RECUR) ) ;
1369         icalrecur_iterator_free(ritr);
1370 }
1371
1372
1373
1374 /*
1375  * Backend for ical_freebusy()
1376  *
1377  * This function simply loads the messages in the user's calendar room,
1378  * which contain VEVENTs, then strips them of all non-freebusy data, and
1379  * adds them to the supplied VCALENDAR.
1380  *
1381  */
1382 void ical_freebusy_backend(long msgnum, void *data) {
1383         icalcomponent *fb;
1384         struct CtdlMessage *msg = NULL;
1385         struct ical_respond_data ird;
1386
1387         fb = (icalcomponent *)data;             /* User-supplied data will be the VFREEBUSY component */
1388
1389         msg = CtdlFetchMessage(msgnum, 1);
1390         if (msg == NULL) return;
1391         memset(&ird, 0, sizeof ird);
1392         strcpy(ird.desired_partnum, "_HUNT_");
1393         mime_parser(msg->cm_fields['M'],
1394                 NULL,
1395                 *ical_locate_part,              /* callback function */
1396                 NULL, NULL,
1397                 (void *) &ird,                  /* user data */
1398                 0
1399         );
1400         CtdlFreeMessage(msg);
1401
1402         if (ird.cal) {
1403                 ical_add_to_freebusy(fb, ird.cal);              /* Add VEVENT times to VFREEBUSY */
1404                 icalcomponent_free(ird.cal);
1405         }
1406 }
1407
1408
1409
1410 /*
1411  * Grab another user's free/busy times
1412  */
1413 void ical_freebusy(char *who) {
1414         struct ctdluser usbuf;
1415         char calendar_room_name[ROOMNAMELEN];
1416         char hold_rm[ROOMNAMELEN];
1417         char *serialized_request = NULL;
1418         icalcomponent *encaps = NULL;
1419         icalcomponent *fb = NULL;
1420         int found_user = (-1);
1421         struct recptypes *recp = NULL;
1422         char buf[256];
1423         char host[256];
1424         char type[256];
1425         int i = 0;
1426         int config_lines = 0;
1427
1428         /* First try an exact match. */
1429         found_user = CtdlGetUser(&usbuf, who);
1430
1431         /* If not found, try it as an unqualified email address. */
1432         if (found_user != 0) {
1433                 strcpy(buf, who);
1434                 recp = validate_recipients(buf, NULL, 0);
1435                 syslog(LOG_DEBUG, "Trying <%s>\n", buf);
1436                 if (recp != NULL) {
1437                         if (recp->num_local == 1) {
1438                                 found_user = CtdlGetUser(&usbuf, recp->recp_local);
1439                         }
1440                         free_recipients(recp);
1441                 }
1442         }
1443
1444         /* If still not found, try it as an address qualified with the
1445          * primary FQDN of this Citadel node.
1446          */
1447         if (found_user != 0) {
1448                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1449                 syslog(LOG_DEBUG, "Trying <%s>\n", buf);
1450                 recp = validate_recipients(buf, NULL, 0);
1451                 if (recp != NULL) {
1452                         if (recp->num_local == 1) {
1453                                 found_user = CtdlGetUser(&usbuf, recp->recp_local);
1454                         }
1455                         free_recipients(recp);
1456                 }
1457         }
1458
1459         /* Still not found?  Try qualifying it with every domain we
1460          * might have addresses in.
1461          */
1462         if (found_user != 0) {
1463                 config_lines = num_tokens(inetcfg, '\n');
1464                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1465                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1466                         extract_token(host, buf, 0, '|', sizeof host);
1467                         extract_token(type, buf, 1, '|', sizeof type);
1468
1469                         if ( (!strcasecmp(type, "localhost"))
1470                            || (!strcasecmp(type, "directory")) ) {
1471                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1472                                 syslog(LOG_DEBUG, "Trying <%s>\n", buf);
1473                                 recp = validate_recipients(buf, NULL, 0);
1474                                 if (recp != NULL) {
1475                                         if (recp->num_local == 1) {
1476                                                 found_user = CtdlGetUser(&usbuf, recp->recp_local);
1477                                         }
1478                                         free_recipients(recp);
1479                                 }
1480                         }
1481                 }
1482         }
1483
1484         if (found_user != 0) {
1485                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1486                 return;
1487         }
1488
1489         CtdlMailboxName(calendar_room_name, sizeof calendar_room_name,
1490                 &usbuf, USERCALENDARROOM);
1491
1492         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1493
1494         if (CtdlGetRoom(&CC->room, calendar_room_name) != 0) {
1495                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1496                 CtdlGetRoom(&CC->room, hold_rm);
1497                 return;
1498         }
1499
1500         /* Create a VFREEBUSY subcomponent */
1501         syslog(LOG_DEBUG, "Creating VFREEBUSY component\n");
1502         fb = icalcomponent_new_vfreebusy();
1503         if (fb == NULL) {
1504                 cprintf("%d Internal error: cannot allocate memory.\n",
1505                         ERROR + INTERNAL_ERROR);
1506                 CtdlGetRoom(&CC->room, hold_rm);
1507                 return;
1508         }
1509
1510         /* Set the method to PUBLISH */
1511         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1512
1513         /* Set the DTSTAMP to right now. */
1514         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1515
1516         /* Add the user's email address as ORGANIZER */
1517         sprintf(buf, "MAILTO:%s", who);
1518         if (strchr(buf, '@') == NULL) {
1519                 strcat(buf, "@");
1520                 strcat(buf, config.c_fqdn);
1521         }
1522         for (i=0; buf[i]; ++i) {
1523                 if (buf[i]==' ') buf[i] = '_';
1524         }
1525         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1526
1527         /* Add busy time from events */
1528         syslog(LOG_DEBUG, "Adding busy time from events\n");
1529         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1530
1531         /* If values for DTSTART and DTEND are still not present, set them
1532          * to yesterday and tomorrow as default values.
1533          */
1534         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1535                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1536         }
1537         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1538                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1539         }
1540
1541         /* Put the freebusy component into the calendar component */
1542         syslog(LOG_DEBUG, "Encapsulating\n");
1543         encaps = ical_encapsulate_subcomponent(fb);
1544         if (encaps == NULL) {
1545                 icalcomponent_free(fb);
1546                 cprintf("%d Internal error: cannot allocate memory.\n",
1547                         ERROR + INTERNAL_ERROR);
1548                 CtdlGetRoom(&CC->room, hold_rm);
1549                 return;
1550         }
1551
1552         /* Set the method to PUBLISH */
1553         syslog(LOG_DEBUG, "Setting method\n");
1554         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1555
1556         /* Serialize it */
1557         syslog(LOG_DEBUG, "Serializing\n");
1558         serialized_request = icalcomponent_as_ical_string_r(encaps);
1559         icalcomponent_free(encaps);     /* Don't need this anymore. */
1560
1561         cprintf("%d Free/busy for %s\n", LISTING_FOLLOWS, usbuf.fullname);
1562         if (serialized_request != NULL) {
1563                 client_write(serialized_request, strlen(serialized_request));
1564                 free(serialized_request);
1565         }
1566         cprintf("\n000\n");
1567
1568         /* Go back to the room from which we came... */
1569         CtdlGetRoom(&CC->room, hold_rm);
1570 }
1571
1572
1573
1574 /*
1575  * Backend for ical_getics()
1576  *
1577  * This is a ForEachMessage() callback function that searches the current room
1578  * for calendar events and adds them each into one big calendar component.
1579  */
1580 void ical_getics_backend(long msgnum, void *data) {
1581         icalcomponent *encaps, *c;
1582         struct CtdlMessage *msg = NULL;
1583         struct ical_respond_data ird;
1584
1585         encaps = (icalcomponent *)data;
1586         if (encaps == NULL) return;
1587
1588         /* Look for the calendar event... */
1589
1590         msg = CtdlFetchMessage(msgnum, 1);
1591         if (msg == NULL) return;
1592         memset(&ird, 0, sizeof ird);
1593         strcpy(ird.desired_partnum, "_HUNT_");
1594         mime_parser(msg->cm_fields['M'],
1595                 NULL,
1596                 *ical_locate_part,              /* callback function */
1597                 NULL, NULL,
1598                 (void *) &ird,                  /* user data */
1599                 0
1600         );
1601         CtdlFreeMessage(msg);
1602
1603         if (ird.cal == NULL) return;
1604
1605         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1606          * are responsible for "the_request"'s memory -- it will be freed
1607          * when we free "encaps".
1608          */
1609
1610         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1611          * in.  This will almost never happen.
1612          */
1613         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1614                 icalcomponent_add_component(encaps, ird.cal);
1615         }
1616         /*
1617          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1618          * and other components encapsulated inside, we have to extract them.
1619          */
1620         else {
1621                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1622                     (c != NULL);
1623                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1624
1625                         /* For VTIMEZONE components, suppress duplicates of the same tzid */
1626
1627                         if (icalcomponent_isa(c) == ICAL_VTIMEZONE_COMPONENT) {
1628                                 icalproperty *p = icalcomponent_get_first_property(c, ICAL_TZID_PROPERTY);
1629                                 if (p) {
1630                                         const char *tzid = icalproperty_get_tzid(p);
1631                                         if (!icalcomponent_get_timezone(encaps, tzid)) {
1632                                                 icalcomponent_add_component(encaps,
1633                                                                         icalcomponent_new_clone(c));
1634                                         }
1635                                 }
1636                         }
1637
1638                         /* All other types of components can go in verbatim */
1639                         else {
1640                                 icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1641                         }
1642                 }
1643                 icalcomponent_free(ird.cal);
1644         }
1645 }
1646
1647
1648
1649 /*
1650  * Retrieve all of the calendar items in the current room, and output them
1651  * as a single icalendar object.
1652  */
1653 void ical_getics(void)
1654 {
1655         icalcomponent *encaps = NULL;
1656         char *ser = NULL;
1657
1658         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1659            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1660                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1661                 return;         /* Not an iCalendar-centric room */
1662         }
1663
1664         encaps = icalcomponent_new_vcalendar();
1665         if (encaps == NULL) {
1666                 syslog(LOG_ALERT, "ERROR: could not allocate component!\n");
1667                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1668                 return;
1669         }
1670
1671         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1672
1673         /* Set the Product ID */
1674         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1675
1676         /* Set the Version Number */
1677         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1678
1679         /* Set the method to PUBLISH */
1680         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1681
1682         /* Now go through the room encapsulating all calendar items. */
1683         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1684                 NULL,
1685                 NULL,
1686                 ical_getics_backend,
1687                 (void *) encaps
1688         );
1689
1690         ser = icalcomponent_as_ical_string_r(encaps);
1691         icalcomponent_free(encaps);                     /* Don't need this anymore. */
1692         client_write(ser, strlen(ser));
1693         free(ser);
1694         cprintf("\n000\n");
1695 }
1696
1697
1698 /*
1699  * Helper callback function for ical_putics() to discover which TZID's we need.
1700  * Simply put the tzid name string into a hash table.  After the callbacks are
1701  * done we'll go through them and attach the ones that we have.
1702  */
1703 void ical_putics_grabtzids(icalparameter *param, void *data)
1704 {
1705         const char *tzid = icalparameter_get_tzid(param);
1706         HashList *keys = (HashList *) data;
1707
1708         if ( (keys) && (tzid) && (!IsEmptyStr(tzid)) ) {
1709                 Put(keys, tzid, strlen(tzid), strdup(tzid), NULL);
1710         }
1711 }
1712
1713
1714 /*
1715  * Delete all of the calendar items in the current room, and replace them
1716  * with calendar items from a client-supplied data stream.
1717  */
1718 void ical_putics(void)
1719 {
1720         char *calstream = NULL;
1721         icalcomponent *cal;
1722         icalcomponent *c;
1723         icalcomponent *encaps = NULL;
1724         HashList *tzidlist = NULL;
1725         HashPos *HashPos;
1726         void *Value;
1727         const char *Key;
1728         long len;
1729
1730         /* Only allow this operation if we're in a room containing a calendar or tasks view */
1731         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1732            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1733                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1734                 return;
1735         }
1736
1737         /* Only allow this operation if we have permission to overwrite the existing calendar */
1738         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1739                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1740                 return;
1741         }
1742
1743         cprintf("%d Transmit data now\n", SEND_LISTING);
1744         calstream = CtdlReadMessageBody(HKEY("000"), config.c_maxmsglen, NULL, 0, 0);
1745         if (calstream == NULL) {
1746                 return;
1747         }
1748
1749         cal = icalcomponent_new_from_string(calstream);
1750         free(calstream);
1751
1752         /* We got our data stream -- now do something with it. */
1753
1754         /* Delete the existing messages in the room, because we are overwriting
1755          * the entire calendar with an entire new (or updated) calendar.
1756          * (Careful: this opens an S_ROOMS critical section!)
1757          */
1758         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1759
1760         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1761          * in.  This will almost never happen.
1762          */
1763         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1764                 ical_write_to_cal(NULL, cal);
1765         }
1766         /*
1767          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1768          * and other components encapsulated inside, we have to extract them.
1769          */
1770         else {
1771                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1772                     (c != NULL);
1773                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1774
1775                         /* Non-VTIMEZONE components each get written as individual messages.
1776                          * But we also need to attach the relevant VTIMEZONE components to them.
1777                          */
1778                         if ( (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT)
1779                            && (encaps = icalcomponent_new_vcalendar()) ) {
1780                                 icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1781                                 icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1782                                 icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1783
1784                                 /* Attach any needed timezones here */
1785                                 tzidlist = NewHash(1, NULL);
1786                                 if (tzidlist) {
1787                                         icalcomponent_foreach_tzid(c, ical_putics_grabtzids, tzidlist);
1788                                 }
1789                                 HashPos = GetNewHashPos(tzidlist, 0);
1790
1791                                 while (GetNextHashPos(tzidlist, HashPos, &len, &Key, &Value)) {
1792                                         syslog(LOG_DEBUG, "Attaching timezone '%s'\n", (char*) Value);
1793                                         icaltimezone *t = NULL;
1794
1795                                         /* First look for a timezone attached to the original calendar */
1796                                         t = icalcomponent_get_timezone(cal, Value);
1797
1798                                         /* Try built-in tzdata if the right one wasn't attached */
1799                                         if (!t) {
1800                                                 t = icaltimezone_get_builtin_timezone(Value);
1801                                         }
1802
1803                                         /* I've got a valid timezone to attach. */
1804                                         if (t) {
1805                                                 icalcomponent_add_component(encaps,
1806                                                         icalcomponent_new_clone(
1807                                                                 icaltimezone_get_component(t)
1808                                                         )
1809                                                 );
1810                                         }
1811
1812                                 }
1813                                 DeleteHashPos(&HashPos);
1814                                 DeleteHash(&tzidlist);
1815
1816                                 /* Now attach the component itself (usually a VEVENT or VTODO) */
1817                                 icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1818
1819                                 /* Write it to the message store */
1820                                 ical_write_to_cal(NULL, encaps);
1821                                 icalcomponent_free(encaps);
1822                         }
1823                 }
1824         }
1825
1826         icalcomponent_free(cal);
1827 }
1828
1829
1830 /*
1831  * All Citadel calendar commands from the client come through here.
1832  */
1833 void cmd_ical(char *argbuf)
1834 {
1835         char subcmd[64];
1836         long msgnum;
1837         char partnum[256];
1838         char action[256];
1839         char who[256];
1840
1841         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1842
1843         /* Allow "test" and "freebusy" subcommands without logging in. */
1844
1845         if (!strcasecmp(subcmd, "test")) {
1846                 cprintf("%d This server supports calendaring\n", CIT_OK);
1847                 return;
1848         }
1849
1850         if (!strcasecmp(subcmd, "freebusy")) {
1851                 extract_token(who, argbuf, 1, '|', sizeof who);
1852                 ical_freebusy(who);
1853                 return;
1854         }
1855
1856         if (!strcasecmp(subcmd, "sgi")) {
1857                 CIT_ICAL->server_generated_invitations =
1858                         (extract_int(argbuf, 1) ? 1 : 0) ;
1859                 cprintf("%d %d\n",
1860                         CIT_OK, CIT_ICAL->server_generated_invitations);
1861                 return;
1862         }
1863
1864         if (CtdlAccessCheck(ac_logged_in)) return;
1865
1866         if (!strcasecmp(subcmd, "respond")) {
1867                 msgnum = extract_long(argbuf, 1);
1868                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1869                 extract_token(action, argbuf, 3, '|', sizeof action);
1870                 ical_respond(msgnum, partnum, action);
1871                 return;
1872         }
1873
1874         if (!strcasecmp(subcmd, "handle_rsvp")) {
1875                 msgnum = extract_long(argbuf, 1);
1876                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1877                 extract_token(action, argbuf, 3, '|', sizeof action);
1878                 ical_handle_rsvp(msgnum, partnum, action);
1879                 return;
1880         }
1881
1882         if (!strcasecmp(subcmd, "conflicts")) {
1883                 msgnum = extract_long(argbuf, 1);
1884                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1885                 ical_conflicts(msgnum, partnum);
1886                 return;
1887         }
1888
1889         if (!strcasecmp(subcmd, "getics")) {
1890                 ical_getics();
1891                 return;
1892         }
1893
1894         if (!strcasecmp(subcmd, "putics")) {
1895                 ical_putics();
1896                 return;
1897         }
1898
1899         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1900 }
1901
1902
1903
1904 /*
1905  * We don't know if the calendar room exists so we just create it at login
1906  */
1907 void ical_CtdlCreateRoom(void)
1908 {
1909         struct ctdlroom qr;
1910         visit vbuf;
1911
1912         /* Create the calendar room if it doesn't already exist */
1913         CtdlCreateRoom(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1914
1915         /* Set expiration policy to manual; otherwise objects will be lost! */
1916         if (CtdlGetRoomLock(&qr, USERCALENDARROOM)) {
1917                 syslog(LOG_CRIT, "Couldn't get the user calendar room!\n");
1918                 return;
1919         }
1920         qr.QRep.expire_mode = EXPIRE_MANUAL;
1921         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1922         CtdlPutRoomLock(&qr);
1923
1924         /* Set the view to a calendar view */
1925         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1926         vbuf.v_view = VIEW_CALENDAR;
1927         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1928
1929         /* Create the tasks list room if it doesn't already exist */
1930         CtdlCreateRoom(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1931
1932         /* Set expiration policy to manual; otherwise objects will be lost! */
1933         if (CtdlGetRoomLock(&qr, USERTASKSROOM)) {
1934                 syslog(LOG_CRIT, "Couldn't get the user calendar room!\n");
1935                 return;
1936         }
1937         qr.QRep.expire_mode = EXPIRE_MANUAL;
1938         qr.QRdefaultview = VIEW_TASKS;
1939         CtdlPutRoomLock(&qr);
1940
1941         /* Set the view to a task list view */
1942         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1943         vbuf.v_view = VIEW_TASKS;
1944         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1945
1946         /* Create the notes room if it doesn't already exist */
1947         CtdlCreateRoom(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1948
1949         /* Set expiration policy to manual; otherwise objects will be lost! */
1950         if (CtdlGetRoomLock(&qr, USERNOTESROOM)) {
1951                 syslog(LOG_CRIT, "Couldn't get the user calendar room!\n");
1952                 return;
1953         }
1954         qr.QRep.expire_mode = EXPIRE_MANUAL;
1955         qr.QRdefaultview = VIEW_NOTES;
1956         CtdlPutRoomLock(&qr);
1957
1958         /* Set the view to a notes view */
1959         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1960         vbuf.v_view = VIEW_NOTES;
1961         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1962
1963         return;
1964 }
1965
1966
1967 /*
1968  * ical_send_out_invitations() is called by ical_saving_vevent() when it finds a VEVENT.
1969  *
1970  * top_level_cal is the highest available level calendar object.
1971  * cal is the subcomponent containing the VEVENT.
1972  *
1973  * Note: if you change the encapsulation code here, change it in WebCit's ical_encapsulate_subcomponent()
1974  */
1975 void ical_send_out_invitations(icalcomponent *top_level_cal, icalcomponent *cal) {
1976         icalcomponent *the_request = NULL;
1977         char *serialized_request = NULL;
1978         icalcomponent *encaps = NULL;
1979         char *request_message_text = NULL;
1980         struct CtdlMessage *msg = NULL;
1981         struct recptypes *valid = NULL;
1982         char attendees_string[SIZ];
1983         int num_attendees = 0;
1984         char this_attendee[256];
1985         icalproperty *attendee = NULL;
1986         char summary_string[SIZ];
1987         icalproperty *summary = NULL;
1988         size_t reqsize;
1989         icalproperty *p;
1990         struct icaltimetype t;
1991         const icaltimezone *attached_zones[5] = { NULL, NULL, NULL, NULL, NULL };
1992         int i;
1993         const icaltimezone *z;
1994         int num_zones_attached = 0;
1995         int zone_already_attached;
1996         icalparameter *tzidp = NULL;
1997         const char *tzidc = NULL;
1998
1999         if (cal == NULL) {
2000                 syslog(LOG_ERR, "ERROR: trying to reply to NULL event?\n");
2001                 return;
2002         }
2003
2004
2005         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
2006         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
2007                 ical_send_out_invitations(top_level_cal,
2008                         icalcomponent_get_first_component(
2009                                 cal, ICAL_VEVENT_COMPONENT
2010                         )
2011                 );
2012                 return;
2013         }
2014
2015         /* Clone the event */
2016         the_request = icalcomponent_new_clone(cal);
2017         if (the_request == NULL) {
2018                 syslog(LOG_ERR, "ERROR: cannot clone calendar object\n");
2019                 return;
2020         }
2021
2022         /* Extract the summary string -- we'll use it as the
2023          * message subject for the request
2024          */
2025         strcpy(summary_string, "Meeting request");
2026         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
2027         if (summary != NULL) {
2028                 if (icalproperty_get_summary(summary)) {
2029                         strcpy(summary_string,
2030                                 icalproperty_get_summary(summary) );
2031                 }
2032         }
2033
2034         /* Determine who the recipients of this message are (the attendees) */
2035         strcpy(attendees_string, "");
2036         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
2037                 const char *ch = icalproperty_get_attendee(attendee);
2038                 if ((ch != NULL) && !strncasecmp(ch, "MAILTO:", 7)) {
2039                         safestrncpy(this_attendee, ch + 7, sizeof(this_attendee));
2040
2041                         if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
2042                                 snprintf(&attendees_string[strlen(attendees_string)],
2043                                          sizeof(attendees_string) - strlen(attendees_string),
2044                                          "%s, ",
2045                                          this_attendee
2046                                         );
2047                                 ++num_attendees;
2048                         }
2049                 }
2050         }
2051
2052         syslog(LOG_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
2053
2054         /* If there are no attendees, there are no invitations to send, so...
2055          * don't bother putting one together!  Punch out, Maverick!
2056          */
2057         if (num_attendees == 0) {
2058                 icalcomponent_free(the_request);
2059                 return;
2060         }
2061
2062         /* Encapsulate the VEVENT component into a complete VCALENDAR */
2063         encaps = icalcomponent_new_vcalendar();
2064         if (encaps == NULL) {
2065                 syslog(LOG_ALERT, "ERROR: could not allocate component!\n");
2066                 icalcomponent_free(the_request);
2067                 return;
2068         }
2069
2070         /* Set the Product ID */
2071         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
2072
2073         /* Set the Version Number */
2074         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
2075
2076         /* Set the method to REQUEST */
2077         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
2078
2079         /* Look for properties containing timezone parameters, to see if we need to attach VTIMEZONEs */
2080         for (p = icalcomponent_get_first_property(the_request, ICAL_ANY_PROPERTY);
2081              p != NULL;
2082              p = icalcomponent_get_next_property(the_request, ICAL_ANY_PROPERTY))
2083         {
2084                 if ( (icalproperty_isa(p) == ICAL_COMPLETED_PROPERTY)
2085                   || (icalproperty_isa(p) == ICAL_CREATED_PROPERTY)
2086                   || (icalproperty_isa(p) == ICAL_DATEMAX_PROPERTY)
2087                   || (icalproperty_isa(p) == ICAL_DATEMIN_PROPERTY)
2088                   || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
2089                   || (icalproperty_isa(p) == ICAL_DTSTAMP_PROPERTY)
2090                   || (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
2091                   || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
2092                   || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
2093                   || (icalproperty_isa(p) == ICAL_LASTMODIFIED_PROPERTY)
2094                   || (icalproperty_isa(p) == ICAL_MAXDATE_PROPERTY)
2095                   || (icalproperty_isa(p) == ICAL_MINDATE_PROPERTY)
2096                   || (icalproperty_isa(p) == ICAL_RECURRENCEID_PROPERTY)
2097                 ) {
2098                         t = icalproperty_get_dtstart(p);        // it's safe to use dtstart for all of them
2099
2100                         /* Determine the tzid in order for some of the conditions below to work */
2101                         tzidp = icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER);
2102                         if (tzidp) {
2103                                 tzidc = icalparameter_get_tzid(tzidp);
2104                         }
2105                         else {
2106                                 tzidc = NULL;
2107                         }
2108
2109                         /* First see if there's a timezone attached to the data structure itself */
2110                         if (icaltime_is_utc(t)) {
2111                                 z = icaltimezone_get_utc_timezone();
2112                         }
2113                         else {
2114                                 z = icaltime_get_timezone(t);
2115                         }
2116
2117                         /* If not, try to determine the tzid from the parameter using attached zones */
2118                         if ((!z) && (tzidc)) {
2119                                 z = icalcomponent_get_timezone(top_level_cal, tzidc);
2120                         }
2121
2122                         /* Still no good?  Try our internal database */
2123                         if ((!z) && (tzidc)) {
2124                                 z = icaltimezone_get_builtin_timezone_from_tzid(tzidc);
2125                         }
2126
2127                         if (z) {
2128                                 /* We have a valid timezone.  Good.  Now we need to attach it. */
2129
2130                                 zone_already_attached = 0;
2131                                 for (i=0; i<5; ++i) {
2132                                         if (z == attached_zones[i]) {
2133                                                 /* We've already got this one, no need to attach another. */
2134                                                 ++zone_already_attached;
2135                                         }
2136                                 }
2137                                 if ((!zone_already_attached) && (num_zones_attached < 5)) {
2138                                         /* This is a new one, so attach it. */
2139                                         attached_zones[num_zones_attached++] = z;
2140                                 }
2141
2142                                 icalproperty_set_parameter(p,
2143                                         icalparameter_new_tzid(icaltimezone_get_tzid(z))
2144                                 );
2145                         }
2146                 }
2147         }
2148
2149         /* Encapsulate any timezones we need */
2150         if (num_zones_attached > 0) for (i=0; i<num_zones_attached; ++i) {
2151                 icalcomponent *zc;
2152                 zc = icalcomponent_new_clone(icaltimezone_get_component(attached_zones[i]));
2153                 icalcomponent_add_component(encaps, zc);
2154         }
2155
2156         /* Here we go: encapsulate the VEVENT into the VCALENDAR.  We now no longer
2157          * are responsible for "the_request"'s memory -- it will be freed
2158          * when we free "encaps".
2159          */
2160         icalcomponent_add_component(encaps, the_request);
2161
2162         /* Serialize it */
2163         serialized_request = icalcomponent_as_ical_string_r(encaps);
2164         icalcomponent_free(encaps);     /* Don't need this anymore. */
2165         if (serialized_request == NULL) return;
2166
2167         reqsize = strlen(serialized_request) + SIZ;
2168         request_message_text = malloc(reqsize);
2169         if (request_message_text != NULL) {
2170                 snprintf(request_message_text, reqsize,
2171                         "Content-type: text/calendar\r\n\r\n%s\r\n",
2172                         serialized_request
2173                 );
2174
2175                 msg = CtdlMakeMessage(
2176                         &CC->user,
2177                         NULL,                   /* No single recipient here */
2178                         NULL,                   /* No single recipient here */
2179                         CC->room.QRname,
2180                         0,
2181                         FMT_RFC822,
2182                         NULL,
2183                         NULL,
2184                         summary_string,         /* Use summary for subject */
2185                         NULL,
2186                         request_message_text,
2187                         NULL
2188                 );
2189
2190                 if (msg != NULL) {
2191                         valid = validate_recipients(attendees_string, NULL, 0);
2192                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
2193                         CtdlFreeMessage(msg);
2194                         free_recipients(valid);
2195                 }
2196         }
2197         free(serialized_request);
2198 }
2199
2200
2201 /*
2202  * When a calendar object is being saved, determine whether it's a VEVENT
2203  * and the user saving it is the organizer.  If so, send out invitations
2204  * to any listed attendees.
2205  *
2206  * This function is recursive.  The caller can simply supply the same object
2207  * as both arguments.  When it recurses it will alter the second argument
2208  * while holding on to the top level object.  This allows us to go back and
2209  * grab things like time zones which might be attached.
2210  *
2211  */
2212 void ical_saving_vevent(icalcomponent *top_level_cal, icalcomponent *cal) {
2213         icalcomponent *c;
2214         icalproperty *organizer = NULL;
2215         char organizer_string[SIZ];
2216
2217         syslog(LOG_DEBUG, "ical_saving_vevent() has been called!\n");
2218
2219         /* Don't send out invitations unless the client wants us to. */
2220         if (CIT_ICAL->server_generated_invitations == 0) {
2221                 return;
2222         }
2223
2224         /* Don't send out invitations if we've been asked not to. */
2225         if (CIT_ICAL->avoid_sending_invitations > 0) {
2226                 return;
2227         }
2228
2229         strcpy(organizer_string, "");
2230         /*
2231          * The VEVENT subcomponent is the one we're interested in.
2232          * Send out invitations if, and only if, this user is the Organizer.
2233          */
2234         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
2235                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
2236                 if (organizer != NULL) {
2237                         if (icalproperty_get_organizer(organizer)) {
2238                                 strcpy(organizer_string,
2239                                         icalproperty_get_organizer(organizer));
2240                         }
2241                 }
2242                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
2243                         strcpy(organizer_string, &organizer_string[7]);
2244                         striplt(organizer_string);
2245                         /*
2246                          * If the user saving the event is listed as the
2247                          * organizer, then send out invitations.
2248                          */
2249                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
2250                                 ical_send_out_invitations(top_level_cal, cal);
2251                         }
2252                 }
2253         }
2254
2255         /* If the component has subcomponents, recurse through them. */
2256         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2257             (c != NULL);
2258             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2259                 /* Recursively process subcomponent */
2260                 ical_saving_vevent(top_level_cal, c);
2261         }
2262
2263 }
2264
2265
2266
2267 /*
2268  * Back end for ical_obj_beforesave()
2269  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
2270  * the summary of the event (becomes message subject),
2271  * and the start time (becomes message date/time).
2272  */
2273 void ical_obj_beforesave_backend(char *name, char *filename, char *partnum,
2274                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2275                 char *encoding, char *cbid, void *cbuserdata)
2276 {
2277         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
2278         icalproperty *p;
2279         char new_uid[256] = "";
2280         char buf[1024] = "";
2281         struct CtdlMessage *msg = (struct CtdlMessage *) cbuserdata;
2282
2283         if (!msg) return;
2284
2285         /* We're only interested in calendar data. */
2286         if (  (strcasecmp(cbtype, "text/calendar"))
2287            && (strcasecmp(cbtype, "application/ics")) ) {
2288                 return;
2289         }
2290
2291         /* Hunt for the UID and drop it in
2292          * the "user data" pointer for the MIME parser.  When
2293          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2294          * to that string.
2295          */
2296         whole_cal = icalcomponent_new_from_string(content);
2297         cal = whole_cal;
2298         if (cal != NULL) {
2299                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
2300                         nested_event = icalcomponent_get_first_component(
2301                                 cal, ICAL_VEVENT_COMPONENT);
2302                         if (nested_event != NULL) {
2303                                 cal = nested_event;
2304                         }
2305                         else {
2306                                 nested_todo = icalcomponent_get_first_component(
2307                                         cal, ICAL_VTODO_COMPONENT);
2308                                 if (nested_todo != NULL) {
2309                                         cal = nested_todo;
2310                                 }
2311                         }
2312                 }
2313
2314                 if (cal != NULL) {
2315
2316                         /* Set the message EUID to the iCalendar UID */
2317
2318                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2319                         if (p == NULL) {
2320                                 /* If there's no uid we must generate one */
2321                                 generate_uuid(new_uid);
2322                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
2323                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2324                         }
2325                         if (p != NULL) {
2326                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2327                                 if (!IsEmptyStr(buf)) {
2328                                         if (msg->cm_fields['E'] != NULL) {
2329                                                 free(msg->cm_fields['E']);
2330                                         }
2331                                         msg->cm_fields['E'] = strdup(buf);
2332                                         syslog(LOG_DEBUG, "Saving calendar UID <%s>\n", buf);
2333                                 }
2334                         }
2335
2336                         /* Set the message subject to the iCalendar summary */
2337
2338                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
2339                         if (p != NULL) {
2340                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2341                                 if (!IsEmptyStr(buf)) {
2342                                         if (msg->cm_fields['U'] != NULL) {
2343                                                 free(msg->cm_fields['U']);
2344                                         }
2345                                         msg->cm_fields['U'] = rfc2047encode(buf, strlen(buf));
2346                                 }
2347                         }
2348
2349                         /* Set the message date/time to the iCalendar start time */
2350
2351                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
2352                         if (p != NULL) {
2353                                 time_t idtstart;
2354                                 idtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
2355                                 if (idtstart > 0) {
2356                                         if (msg->cm_fields['T'] != NULL) {
2357                                                 free(msg->cm_fields['T']);
2358                                         }
2359                                         msg->cm_fields['T'] = strdup("000000000000000000");
2360                                         sprintf(msg->cm_fields['T'], "%ld", idtstart);
2361                                 }
2362                         }
2363
2364                 }
2365                 icalcomponent_free(cal);
2366                 if (whole_cal != cal) {
2367                         icalcomponent_free(whole_cal);
2368                 }
2369         }
2370 }
2371
2372
2373
2374
2375 /*
2376  * See if we need to prevent the object from being saved (we don't allow
2377  * MIME types other than text/calendar in "calendar" or "tasks" rooms).
2378  *
2379  * If the message is being saved, we also set various message header fields
2380  * using data found in the iCalendar object.
2381  */
2382 int ical_obj_beforesave(struct CtdlMessage *msg)
2383 {
2384         /* First determine if this is a calendar or tasks room */
2385         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
2386            && (CC->room.QRdefaultview != VIEW_TASKS)
2387         ) {
2388                 return(0);              /* Not an iCalendar-centric room */
2389         }
2390
2391         /* It must be an RFC822 message! */
2392         if (msg->cm_format_type != 4) {
2393                 syslog(LOG_DEBUG, "Rejecting non-RFC822 message\n");
2394                 return(1);              /* You tried to save a non-RFC822 message! */
2395         }
2396
2397         if (msg->cm_fields['M'] == NULL) {
2398                 return(1);              /* You tried to save a null message! */
2399         }
2400
2401         /* Do all of our lovely back-end parsing */
2402         mime_parser(msg->cm_fields['M'],
2403                 NULL,
2404                 *ical_obj_beforesave_backend,
2405                 NULL, NULL,
2406                 (void *)msg,
2407                 0
2408         );
2409
2410         return(0);
2411 }
2412
2413
2414 /*
2415  * Things we need to do after saving a calendar event.
2416  */
2417 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
2418                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2419                 char *encoding, char *cbid, void *cbuserdata)
2420 {
2421         icalcomponent *cal;
2422
2423         /* We're only interested in calendar items here. */
2424         if (  (strcasecmp(cbtype, "text/calendar"))
2425            && (strcasecmp(cbtype, "application/ics")) ) {
2426                 return;
2427         }
2428
2429         /* Hunt for the UID and drop it in
2430          * the "user data" pointer for the MIME parser.  When
2431          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2432          * to that string.
2433          */
2434         if (  (!strcasecmp(cbtype, "text/calendar"))
2435            || (!strcasecmp(cbtype, "application/ics")) ) {
2436                 cal = icalcomponent_new_from_string(content);
2437                 if (cal != NULL) {
2438                         ical_saving_vevent(cal, cal);
2439                         icalcomponent_free(cal);
2440                 }
2441         }
2442 }
2443
2444
2445 /*
2446  * Things we need to do after saving a calendar event.
2447  * (This will start back end tasks such as automatic generation of invitations,
2448  * if such actions are appropriate.)
2449  */
2450 int ical_obj_aftersave(struct CtdlMessage *msg)
2451 {
2452         char roomname[ROOMNAMELEN];
2453
2454         /*
2455          * If this isn't the Calendar> room, no further action is necessary.
2456          */
2457
2458         /* First determine if this is our room */
2459         CtdlMailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2460         if (strcasecmp(roomname, CC->room.QRname)) {
2461                 return(0);      /* Not the Calendar room -- don't do anything. */
2462         }
2463
2464         /* It must be an RFC822 message! */
2465         if (msg->cm_format_type != 4) return(1);
2466
2467         /* Reject null messages */
2468         if (msg->cm_fields['M'] == NULL) return(1);
2469
2470         /* Now recurse through it looking for our icalendar data */
2471         mime_parser(msg->cm_fields['M'],
2472                 NULL,
2473                 *ical_obj_aftersave_backend,
2474                 NULL, NULL,
2475                 NULL,
2476                 0
2477         );
2478
2479         return(0);
2480 }
2481
2482
2483 void ical_session_startup(void) {
2484         CIT_ICAL = malloc(sizeof(struct cit_ical));
2485         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2486 }
2487
2488 void ical_session_shutdown(void) {
2489         free(CIT_ICAL);
2490 }
2491
2492
2493 /*
2494  * Back end for ical_fixed_output()
2495  */
2496 void ical_fixed_output_backend(icalcomponent *cal,
2497                         int recursion_level
2498 ) {
2499         icalcomponent *c;
2500         icalproperty *p;
2501         char buf[256];
2502         const char *ch;
2503
2504         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2505         if (p != NULL) {
2506                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2507         }
2508
2509         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2510         if (p != NULL) {
2511                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2512         }
2513
2514         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2515         if (p != NULL) {
2516                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2517         }
2518
2519         /* If the component has attendees, iterate through them. */
2520         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2521                 ch =  icalproperty_get_attendee(p);
2522                 if ((ch != NULL) &&
2523                     !strncasecmp(ch, "MAILTO:", 7)) {
2524
2525                         /* screen name or email address */
2526                         safestrncpy(buf, ch + 7, sizeof(buf));
2527                         striplt(buf);
2528                         cprintf("%s ", buf);
2529                 }
2530                 cprintf("\n");
2531         }
2532
2533         /* If the component has subcomponents, recurse through them. */
2534         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2535             (c != 0);
2536             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2537                 /* Recursively process subcomponent */
2538                 ical_fixed_output_backend(c, recursion_level+1);
2539         }
2540 }
2541
2542
2543
2544 /*
2545  * Function to output iCalendar data as plain text.  Nobody uses MSG0
2546  * anymore, so really this is just so we expose the vCard data to the full
2547  * text indexer.
2548  */
2549 void ical_fixed_output(char *ptr, int len) {
2550         icalcomponent *cal;
2551         char *stringy_cal;
2552
2553         stringy_cal = malloc(len + 1);
2554         safestrncpy(stringy_cal, ptr, len + 1);
2555         cal = icalcomponent_new_from_string(stringy_cal);
2556         free(stringy_cal);
2557
2558         if (cal == NULL) {
2559                 return;
2560         }
2561
2562         ical_fixed_output_backend(cal, 0);
2563
2564         /* Free the memory we obtained from libical's constructor */
2565         icalcomponent_free(cal);
2566 }
2567
2568
2569
2570 void serv_calendar_destroy(void)
2571 {
2572         icaltimezone_free_builtin_timezones();
2573 }
2574
2575 /*
2576  * Register this module with the Citadel server.
2577  */
2578 CTDL_MODULE_INIT(calendar)
2579 {
2580         if (!threading)
2581         {
2582
2583                 /* Tell libical to return errors instead of aborting if it gets bad data */
2584                 icalerror_errors_are_fatal = 0;
2585
2586                 /* Use our own application prefix in tzid's generated from system tzdata */
2587                 icaltimezone_set_tzid_prefix("/citadel.org/");
2588
2589                 /* Initialize our hook functions */
2590                 CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2591                 CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2592                 CtdlRegisterSessionHook(ical_CtdlCreateRoom, EVT_LOGIN);
2593                 CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2594                 CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2595                 CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2596                 CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2597                 CtdlRegisterFixedOutputHook("application/ics", ical_fixed_output);
2598                 CtdlRegisterCleanupHook(serv_calendar_destroy);
2599         }
2600
2601         /* return our module name for the log */
2602         return "calendar";
2603 }