citadel/modules/calendar/serv_calendar.c

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