citadel/modules/calendar/serv_calendar.c

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