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