citadel/serv_calendar.c

   1 /*
   2  * $Id$
   3  *
   4  * This module implements iCalendar object processing and the Calendar>
   5  * room on a Citadel/UX server.  It handles iCalendar objects using the
   6  * iTIP protocol.  See RFCs 2445 and 2446.
   7  *
   8  */
   9
  10 #define PRODID "-//Citadel//NONSGML Citadel Calendar//EN"
  11
  12 #include "sysdep.h"
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <limits.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #ifdef HAVE_STRINGS_H
  19 #include <strings.h>
  20 #endif
  21 #include "citadel.h"
  22 #include "server.h"
  23 #include "citserver.h"
  24 #include "sysdep_decls.h"
  25 #include "support.h"
  26 #include "config.h"
  27 #include "dynloader.h"
  28 #include "user_ops.h"
  29 #include "room_ops.h"
  30 #include "tools.h"
  31 #include "msgbase.h"
  32 #include "mime_parser.h"
  33 #include "serv_calendar.h"
  34
  35 #ifdef HAVE_ICAL_H
  36
  37 #include <ical.h>
  38 #include "ical_dezonify.h"
  39
  40 struct ical_respond_data {
  41         char desired_partnum[SIZ];
  42         icalcomponent *cal;
  43 };
  44
  45 /* Session-local data for calendaring. */
  46 long SYM_CIT_ICAL;
  47
  48 /*
  49  * Write a calendar object into the specified user's calendar room.
  50  */
  51 void ical_write_to_cal(struct usersupp *u, icalcomponent *cal) {
  52         char temp[PATH_MAX];
  53         FILE *fp;
  54         char *ser;
  55
  56         strcpy(temp, tmpnam(NULL));
  57         ser = icalcomponent_as_ical_string(cal);
  58         if (ser == NULL) return;
  59
  60         /* Make a temp file out of it */
  61         fp = fopen(temp, "w");
  62         if (fp == NULL) return;
  63         fwrite(ser, strlen(ser), 1, fp);
  64         fclose(fp);
  65
  66         /* This handy API function does all the work for us.
  67          */
  68         CtdlWriteObject(USERCALENDARROOM,       /* which room */
  69                         "text/calendar",        /* MIME type */
  70                         temp,                   /* temp file */
  71                         u,                      /* which user */
  72                         0,                      /* not binary */
  73                         0,              /* don't delete others of this type */
  74                         0);                     /* no flags */
  75
  76         unlink(temp);
  77 }
  78
  79
  80 /*
  81  * Add a calendar object to the user's calendar
  82  */
  83 void ical_add(icalcomponent *cal, int recursion_level) {
  84         icalcomponent *c;
  85
  86         /*
  87          * The VEVENT subcomponent is the one we're interested in saving.
  88          */
  89         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
  90
  91                 ical_write_to_cal(&CC->usersupp, cal);
  92
  93         }
  94
  95         /* If the component has subcomponents, recurse through them. */
  96         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
  97             (c != 0);
  98             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
  99                 /* Recursively process subcomponent */
 100                 ical_add(c, recursion_level+1);
 101         }
 102
 103 }
 104
 105
 106
 107 /*
 108  * Send a reply to a meeting invitation.
 109  *
 110  * 'request' is the invitation to reply to.
 111  * 'action' is the string "accept" or "decline".
 112  *
 113  * (Sorry about this being more than 80 columns ... there was just
 114  * no easy way to break it down sensibly.)
 115  */
 116 void ical_send_a_reply(icalcomponent *request, char *action) {
 117         icalcomponent *the_reply = NULL;
 118         icalcomponent *vevent = NULL;
 119         icalproperty *attendee = NULL;
 120         char attendee_string[SIZ];
 121         icalproperty *organizer = NULL;
 122         char organizer_string[SIZ];
 123         icalproperty *summary = NULL;
 124         char summary_string[SIZ];
 125         icalproperty *me_attend = NULL;
 126         struct recptypes *recp = NULL;
 127         icalparameter *partstat = NULL;
 128         char *serialized_reply = NULL;
 129         char *reply_message_text = NULL;
 130         struct CtdlMessage *msg = NULL;
 131         struct recptypes *valid = NULL;
 132
 133         strcpy(organizer_string, "");
 134         strcpy(summary_string, "Calendar item");
 135
 136         if (request == NULL) {
 137                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 138                 return;
 139         }
 140
 141         the_reply = icalcomponent_new_clone(request);
 142         ical_dezonify(the_reply);
 143         if (the_reply == NULL) {
 144                 lprintf(3, "ERROR: cannot clone request\n");
 145                 return;
 146         }
 147
 148         /* Change the method from REQUEST to REPLY */
 149         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 150
 151         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 152         if (vevent != NULL) {
 153                 /* Hunt for attendees, removing ones that aren't us.
 154                  * (Actually, remove them all, cloning our own one so we can
 155                  * re-insert it later)
 156                  */
 157                 while (attendee = icalcomponent_get_first_property(vevent,
 158                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 159                 ) {
 160                         if (icalproperty_get_attendee(attendee)) {
 161                                 strcpy(attendee_string,
 162                                         icalproperty_get_attendee(attendee) );
 163                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 164                                         strcpy(attendee_string, &attendee_string[7]);
 165                                         striplt(attendee_string);
 166                                         recp = validate_recipients(attendee_string);
 167                                         if (recp != NULL) {
 168                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 169                                                         if (me_attend) icalproperty_free(me_attend);
 170                                                         me_attend = icalproperty_new_clone(attendee);
 171                                                 }
 172                                                 phree(recp);
 173                                         }
 174                                 }
 175                         }
 176                         /* Remove it... */
 177                         icalcomponent_remove_property(vevent, attendee);
 178                         icalproperty_free(attendee);
 179                 }
 180
 181                 /* We found our own address in the attendee list. */
 182                 if (me_attend) {
 183                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 184                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 185
 186                         if (!strcasecmp(action, "accept")) {
 187                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 188                         }
 189                         else if (!strcasecmp(action, "decline")) {
 190                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 191                         }
 192                         else if (!strcasecmp(action, "tentative")) {
 193                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 194                         }
 195
 196                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 197
 198                         /* Now insert it back into the vevent. */
 199                         icalcomponent_add_property(vevent, me_attend);
 200                 }
 201
 202                 /* Figure out who to send this thing to */
 203                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 204                 if (organizer != NULL) {
 205                         if (icalproperty_get_organizer(organizer)) {
 206                                 strcpy(organizer_string,
 207                                         icalproperty_get_organizer(organizer) );
 208                         }
 209                 }
 210                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 211                         strcpy(organizer_string, &organizer_string[7]);
 212                         striplt(organizer_string);
 213                 } else {
 214                         strcpy(organizer_string, "");
 215                 }
 216
 217                 /* Extract the summary string -- we'll use it as the
 218                  * message subject for the reply
 219                  */
 220                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 221                 if (summary != NULL) {
 222                         if (icalproperty_get_summary(summary)) {
 223                                 strcpy(summary_string,
 224                                         icalproperty_get_summary(summary) );
 225                         }
 226                 }
 227
 228         }
 229
 230         /* Now generate the reply message and send it out. */
 231         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 232         icalcomponent_free(the_reply);  /* don't need this anymore */
 233         if (serialized_reply == NULL) return;
 234
 235         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 236         if (reply_message_text != NULL) {
 237                 sprintf(reply_message_text,
 238                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 239                         serialized_reply
 240                 );
 241
 242                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 243                         CC->quickroom.QRname, 0, FMT_RFC822,
 244                         "",
 245                         summary_string,         /* Use summary for subject */
 246                         reply_message_text);
 247
 248                 if (msg != NULL) {
 249                         valid = validate_recipients(organizer_string);
 250                         CtdlSubmitMsg(msg, valid, "");
 251                         CtdlFreeMessage(msg);
 252                 }
 253         }
 254         phree(serialized_reply);
 255 }
 256
 257
 258
 259 /*
 260  * Callback function for mime parser that hunts for calendar content types
 261  * and turns them into calendar objects
 262  */
 263 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 264                 void *content, char *cbtype, size_t length, char *encoding,
 265                 void *cbuserdata) {
 266
 267         struct ical_respond_data *ird = NULL;
 268
 269         ird = (struct ical_respond_data *) cbuserdata;
 270         if (ird->cal != NULL) {
 271                 icalcomponent_free(ird->cal);
 272                 ird->cal = NULL;
 273         }
 274         if (strcasecmp(partnum, ird->desired_partnum)) return;
 275         ird->cal = icalcomponent_new_from_string(content);
 276         ical_dezonify(ird->cal);
 277 }
 278
 279
 280 /*
 281  * Respond to a meeting request.
 282  */
 283 void ical_respond(long msgnum, char *partnum, char *action) {
 284         struct CtdlMessage *msg;
 285         struct ical_respond_data ird;
 286
 287         if (
 288            (strcasecmp(action, "accept"))
 289            && (strcasecmp(action, "decline"))
 290         ) {
 291                 cprintf("%d Action must be 'accept' or 'decline'\n",
 292                         ERROR + ILLEGAL_VALUE
 293                 );
 294                 return;
 295         }
 296
 297         msg = CtdlFetchMessage(msgnum);
 298         if (msg == NULL) {
 299                 cprintf("%d Message %ld not found.\n",
 300                         ERROR+ILLEGAL_VALUE,
 301                         (long)msgnum
 302                 );
 303                 return;
 304         }
 305
 306         memset(&ird, 0, sizeof ird);
 307         strcpy(ird.desired_partnum, partnum);
 308         mime_parser(msg->cm_fields['M'],
 309                 NULL,
 310                 *ical_locate_part,              /* callback function */
 311                 NULL, NULL,
 312                 (void *) &ird,                  /* user data */
 313                 0
 314         );
 315
 316         /* We're done with the incoming message, because we now have a
 317          * calendar object in memory.
 318          */
 319         CtdlFreeMessage(msg);
 320
 321         /*
 322          * Here is the real meat of this function.  Handle the event.
 323          */
 324         if (ird.cal != NULL) {
 325                 /* Save this in the user's calendar if necessary */
 326                 if (!strcasecmp(action, "accept")) {
 327                         ical_add(ird.cal, 0);
 328                 }
 329
 330                 /* Send a reply if necessary */
 331                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 332                         ical_send_a_reply(ird.cal, action);
 333                 }
 334
 335                 /* Now that we've processed this message, we don't need it
 336                  * anymore.  So delete it.
 337                  */
 338                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 339
 340                 /* Free the memory we allocated and return a response. */
 341                 icalcomponent_free(ird.cal);
 342                 ird.cal = NULL;
 343                 cprintf("%d ok\n", CIT_OK);
 344                 return;
 345         }
 346         else {
 347                 cprintf("%d No calendar object found\n", ERROR);
 348                 return;
 349         }
 350
 351         /* should never get here */
 352 }
 353
 354
 355 /*
 356  * Figure out the UID of the calendar event being referred to in a
 357  * REPLY object.  This function is recursive.
 358  */
 359 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 360         icalcomponent *subcomponent;
 361         icalproperty *p;
 362
 363         /* If this object is a REPLY, then extract the UID. */
 364         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 365                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 366                 if (p != NULL) {
 367                         strcpy(uidbuf, icalproperty_get_comment(p));
 368                 }
 369         }
 370
 371         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 372          * UID of the reply; we want the UID of the invitation being replied to.
 373          */
 374         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 375             subcomponent != NULL;
 376             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 377                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 378         }
 379 }
 380
 381
 382 /*
 383  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 384  * locate the message containing the calendar event we're replying to, this function
 385  * gets called.  It basically just sticks the message number in a supplied buffer.
 386  */
 387 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 388         long *msgnumptr;
 389
 390         msgnumptr = (long *) data;
 391         *msgnumptr = msgnum;
 392 }
 393
 394
 395 struct original_event_container {
 396         icalcomponent *c;
 397 };
 398
 399 /*
 400  * Callback function for mime parser that hunts for calendar content types
 401  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 402  * to fetch the object being updated)
 403  */
 404 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 405                 void *content, char *cbtype, size_t length, char *encoding,
 406                 void *cbuserdata) {
 407
 408         struct original_event_container *oec = NULL;
 409
 410         if (strcasecmp(cbtype, "text/calendar")) {
 411                 return;
 412         }
 413         oec = (struct original_event_container *) cbuserdata;
 414         if (oec->c != NULL) {
 415                 icalcomponent_free(oec->c);
 416         }
 417         oec->c = icalcomponent_new_from_string(content);
 418         ical_dezonify(oec->c);
 419 }
 420
 421
 422 /*
 423  * Merge updated attendee information from a REPLY into an existing event.
 424  */
 425 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 426         icalcomponent *c;
 427         icalproperty *e_attendee, *r_attendee;
 428
 429         /* First things first.  If we're not looking at a VEVENT component,
 430          * recurse through subcomponents until we find one.
 431          */
 432         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 433                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 434                     c != NULL;
 435                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 436                         ical_merge_attendee_reply(c, reply);
 437                 }
 438                 return;
 439         }
 440
 441         /* Now do the same thing with the reply.
 442          */
 443         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 444                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 445                     c != NULL;
 446                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 447                         ical_merge_attendee_reply(event, c);
 448                 }
 449                 return;
 450         }
 451
 452         /* Clone the reply, because we're going to rip its guts out. */
 453         reply = icalcomponent_new_clone(reply);
 454         ical_dezonify(reply);
 455
 456         /* At this point we're looking at the correct subcomponents.
 457          * Iterate through the attendees looking for a match.
 458          */
 459 STARTOVER:
 460         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 461             e_attendee != NULL;
 462             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 463
 464                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 465                     r_attendee != NULL;
 466                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 467
 468                         /* Check to see if these two attendees match...
 469                          */
 470                         if (!strcasecmp(
 471                            icalproperty_get_attendee(e_attendee),
 472                            icalproperty_get_attendee(r_attendee)
 473                         )) {
 474                                 /* ...and if they do, remove the attendee from the event
 475                                  * and replace it with the attendee from the reply.  (The
 476                                  * reply's copy will have the same address, but an updated
 477                                  * status.)
 478                                  */
 479                                 TRACE;
 480                                 icalcomponent_remove_property(event, e_attendee);
 481                                 TRACE;
 482                                 icalproperty_free(e_attendee);
 483                                 TRACE;
 484                                 icalcomponent_remove_property(reply, r_attendee);
 485                                 TRACE;
 486                                 icalcomponent_add_property(event, r_attendee);
 487                                 TRACE;
 488
 489                                 /* Since we diddled both sets of attendees, we have to start
 490                                  * the iteration over again.  This will not create an infinite
 491                                  * loop because we removed the attendee from the reply.  (That's
 492                                  * why we cloned the reply, and that's what we mean by "ripping
 493                                  * its guts out.")
 494                                  */
 495                                 goto STARTOVER;
 496                         }
 497
 498                 }
 499         }
 500
 501         /* Free the *clone* of the reply. */
 502         icalcomponent_free(reply);
 503 }
 504
 505
 506
 507
 508 /*
 509  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 510  * calendar event.  The object has already been deserialized for us; all
 511  * we have to do here is hunt for the event in our calendar, merge in the
 512  * updated attendee status, and save it again.
 513  *
 514  * This function returns 0 on success, 1 if the event was not found in the
 515  * user's calendar, or 2 if an internal error occurred.
 516  */
 517 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 518         char uid[SIZ];
 519         char hold_rm[ROOMNAMELEN];
 520         long msgnum_being_replaced = 0;
 521         struct CtdlMessage *template = NULL;
 522         struct CtdlMessage *msg;
 523         struct original_event_container oec;
 524         icalcomponent *original_event;
 525         char *serialized_event = NULL;
 526         char roomname[ROOMNAMELEN];
 527         char *message_text = NULL;
 528
 529         /* Figure out just what event it is we're dealing with */
 530         strcpy(uid, "--==<< InVaLiD uId >>==--");
 531         ical_learn_uid_of_reply(uid, cal);
 532         lprintf(9, "UID of event being replied to is <%s>\n", uid);
 533
 534         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 535
 536         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 537                 getroom(&CC->quickroom, hold_rm);
 538                 lprintf(3, "cannot get user calendar room\n");
 539                 return(2);
 540         }
 541
 542         /*
 543          * Pound through the user's calendar looking for a message with
 544          * the Citadel EUID set to the value we're looking for.  Since
 545          * Citadel always sets the message EUID to the vCalendar UID of
 546          * the event, this will work.
 547          */
 548         template = (struct CtdlMessage *)
 549                 mallok(sizeof(struct CtdlMessage));
 550         memset(template, 0, sizeof(struct CtdlMessage));
 551         template->cm_fields['E'] = strdoop(uid);
 552         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 553                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 554         CtdlFreeMessage(template);
 555         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 556
 557         lprintf(9, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 558         if (msgnum_being_replaced == 0) {
 559                 return(1);                      /* no calendar event found */
 560         }
 561
 562         /* Now we know the ID of the message containing the event being updated.
 563          * We don't actually have to delete it; that'll get taken care of by the
 564          * server when we save another event with the same UID.  This just gives
 565          * us the ability to load the event into memory so we can diddle the
 566          * attendees.
 567          */
 568         msg = CtdlFetchMessage(msgnum_being_replaced);
 569         if (msg == NULL) {
 570                 return(2);                      /* internal error */
 571         }
 572         oec.c = NULL;
 573         mime_parser(msg->cm_fields['M'],
 574                 NULL,
 575                 *ical_locate_original_event,    /* callback function */
 576                 NULL, NULL,
 577                 &oec,                           /* user data */
 578                 0
 579         );
 580         CtdlFreeMessage(msg);
 581
 582         original_event = oec.c;
 583         if (original_event == NULL) {
 584                 lprintf(3, "ERROR: Original_component is NULL.\n");
 585                 return(2);
 586         }
 587
 588         /* Merge the attendee's updated status into the event */
 589         ical_merge_attendee_reply(original_event, cal);
 590
 591         /* Serialize it */
 592         serialized_event = strdoop(icalcomponent_as_ical_string(original_event));
 593         icalcomponent_free(original_event);     /* Don't need this anymore. */
 594         if (serialized_event == NULL) return(2);
 595
 596         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 597
 598         message_text = mallok(strlen(serialized_event) + SIZ);
 599         if (message_text != NULL) {
 600                 sprintf(message_text,
 601                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 602                         serialized_event
 603                 );
 604
 605                 msg = CtdlMakeMessage(&CC->usersupp,
 606                         "",                     /* No recipient */
 607                         roomname,
 608                         0, FMT_RFC822,
 609                         "",
 610                         "",             /* no subject */
 611                         message_text);
 612
 613                 if (msg != NULL) {
 614                         CIT_ICAL->avoid_sending_invitations = 1;
 615                         CtdlSubmitMsg(msg, NULL, roomname);
 616                         CtdlFreeMessage(msg);
 617                         CIT_ICAL->avoid_sending_invitations = 0;
 618                 }
 619         }
 620         phree(serialized_event);
 621         return(0);
 622 }
 623
 624
 625 /*
 626  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 627  * simply extracts the calendar object from the message, deserializes it, and
 628  * passes it up to ical_update_my_calendar_with_reply() for processing.
 629  */
 630 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 631         struct CtdlMessage *msg;
 632         struct ical_respond_data ird;
 633         int ret;
 634
 635         if (
 636            (strcasecmp(action, "update"))
 637            && (strcasecmp(action, "ignore"))
 638         ) {
 639                 cprintf("%d Action must be 'update' or 'ignore'\n",
 640                         ERROR + ILLEGAL_VALUE
 641                 );
 642                 return;
 643         }
 644
 645         msg = CtdlFetchMessage(msgnum);
 646         if (msg == NULL) {
 647                 cprintf("%d Message %ld not found.\n",
 648                         ERROR+ILLEGAL_VALUE,
 649                         (long)msgnum
 650                 );
 651                 return;
 652         }
 653
 654         memset(&ird, 0, sizeof ird);
 655         strcpy(ird.desired_partnum, partnum);
 656         mime_parser(msg->cm_fields['M'],
 657                 NULL,
 658                 *ical_locate_part,              /* callback function */
 659                 NULL, NULL,
 660                 (void *) &ird,                  /* user data */
 661                 0
 662         );
 663
 664         /* We're done with the incoming message, because we now have a
 665          * calendar object in memory.
 666          */
 667         CtdlFreeMessage(msg);
 668
 669         /*
 670          * Here is the real meat of this function.  Handle the event.
 671          */
 672         if (ird.cal != NULL) {
 673                 /* Update the user's calendar if necessary */
 674                 if (!strcasecmp(action, "update")) {
 675                         ret = ical_update_my_calendar_with_reply(ird.cal);
 676                         if (ret == 0) {
 677                                 cprintf("%d Your calendar has been updated with this reply.\n",
 678                                         CIT_OK);
 679                         }
 680                         else if (ret == 1) {
 681                                 cprintf("%d This event does not exist in your calendar.\n",
 682                                         ERROR + FILE_NOT_FOUND);
 683                         }
 684                         else {
 685                                 cprintf("%d An internal error occurred.\n",
 686                                         ERROR + INTERNAL_ERROR);
 687                         }
 688                 }
 689                 else {
 690                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 691                 }
 692
 693                 /* Now that we've processed this message, we don't need it
 694                  * anymore.  So delete it.  FIXME uncomment this when ready!
 695                  */
 696                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 697
 698                 /* Free the memory we allocated and return a response. */
 699                 icalcomponent_free(ird.cal);
 700                 ird.cal = NULL;
 701                 return;
 702         }
 703         else {
 704                 cprintf("%d No calendar object found\n", ERROR);
 705                 return;
 706         }
 707
 708         /* should never get here */
 709 }
 710
 711
 712 /*
 713  * Search for a property in both the top level and in a VEVENT subcomponent
 714  */
 715 icalproperty *ical_ctdl_get_subprop(
 716                 icalcomponent *cal,
 717                 icalproperty_kind which_prop
 718 ) {
 719         icalproperty *p;
 720         icalcomponent *c;
 721
 722         p = icalcomponent_get_first_property(cal, which_prop);
 723         if (p == NULL) {
 724                 c = icalcomponent_get_first_component(cal,
 725                                                         ICAL_VEVENT_COMPONENT);
 726                 if (c != NULL) {
 727                         p = icalcomponent_get_first_property(c, which_prop);
 728                 }
 729         }
 730         return p;
 731 }
 732
 733
 734 /*
 735  * Check to see if two events overlap.  Returns nonzero if they do.
 736  */
 737 int ical_ctdl_is_overlap(
 738                         struct icaltimetype t1start,
 739                         struct icaltimetype t1end,
 740                         struct icaltimetype t2start,
 741                         struct icaltimetype t2end
 742 ) {
 743
 744         if (icaltime_is_null_time(t1start)) return(0);
 745         if (icaltime_is_null_time(t2start)) return(0);
 746
 747         /* First, check for all-day events */
 748         if (t1start.is_date) {
 749                 if (!icaltime_compare_date_only(t1start, t2start)) {
 750                         return(1);
 751                 }
 752                 if (!icaltime_is_null_time(t2end)) {
 753                         if (!icaltime_compare_date_only(t1start, t2end)) {
 754                                 return(1);
 755                         }
 756                 }
 757         }
 758
 759         if (t2start.is_date) {
 760                 if (!icaltime_compare_date_only(t2start, t1start)) {
 761                         return(1);
 762                 }
 763                 if (!icaltime_is_null_time(t1end)) {
 764                         if (!icaltime_compare_date_only(t2start, t1end)) {
 765                                 return(1);
 766                         }
 767                 }
 768         }
 769
 770         /* Now check for overlaps using date *and* time. */
 771
 772         /* First, bail out if either event 1 or event 2 is missing end time. */
 773         if (icaltime_is_null_time(t1end)) return(0);
 774         if (icaltime_is_null_time(t2end)) return(0);
 775
 776         /* If event 1 ends before event 2 starts, we're in the clear. */
 777         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 778
 779         /* If event 2 ends before event 1 starts, we're also ok. */
 780         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 781
 782         /* Otherwise, they overlap. */
 783         return(1);
 784 }
 785
 786
 787
 788 /*
 789  * Backend for ical_hunt_for_conflicts()
 790  */
 791 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 792         icalcomponent *cal;
 793         struct CtdlMessage *msg;
 794         struct ical_respond_data ird;
 795         struct icaltimetype t1start, t1end, t2start, t2end;
 796         icalproperty *p;
 797         char conflict_event_uid[SIZ];
 798         char conflict_event_summary[SIZ];
 799         char compare_uid[SIZ];
 800
 801         cal = (icalcomponent *)data;
 802         strcpy(compare_uid, "");
 803         strcpy(conflict_event_uid, "");
 804         strcpy(conflict_event_summary, "");
 805
 806         msg = CtdlFetchMessage(msgnum);
 807         if (msg == NULL) return;
 808         memset(&ird, 0, sizeof ird);
 809         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 810         mime_parser(msg->cm_fields['M'],
 811                 NULL,
 812                 *ical_locate_part,              /* callback function */
 813                 NULL, NULL,
 814                 (void *) &ird,                  /* user data */
 815                 0
 816         );
 817         CtdlFreeMessage(msg);
 818
 819         if (ird.cal == NULL) return;
 820
 821         t1start = icaltime_null_time();
 822         t1end = icaltime_null_time();
 823         t2start = icaltime_null_time();
 824         t1end = icaltime_null_time();
 825
 826         /* Now compare cal to ird.cal */
 827         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 828         if (p == NULL) return;
 829         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 830
 831         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 832         if (p != NULL) t2end = icalproperty_get_dtend(p);
 833
 834         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 835         if (p == NULL) return;
 836         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 837
 838         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 839         if (p != NULL) t1end = icalproperty_get_dtend(p);
 840
 841         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 842         if (p != NULL) {
 843                 strcpy(compare_uid, icalproperty_get_comment(p));
 844         }
 845
 846         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 847         if (p != NULL) {
 848                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 849         }
 850
 851         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 852         if (p != NULL) {
 853                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 854         }
 855
 856
 857         icalcomponent_free(ird.cal);
 858
 859         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 860                 cprintf("%ld||%s|%s|%d|\n",
 861                         msgnum,
 862                         conflict_event_uid,
 863                         conflict_event_summary,
 864                         (       ((strlen(compare_uid)>0)
 865                                 &&(!strcasecmp(compare_uid,
 866                                 conflict_event_uid))) ? 1 : 0
 867                         )
 868                 );
 869         }
 870 }
 871
 872
 873
 874 /*
 875  * Phase 2 of "hunt for conflicts" operation.
 876  * At this point we have a calendar object which represents the VEVENT that
 877  * we're considering adding to the calendar.  Now hunt through the user's
 878  * calendar room, and output zero or more existing VEVENTs which conflict
 879  * with this one.
 880  */
 881 void ical_hunt_for_conflicts(icalcomponent *cal) {
 882         char hold_rm[ROOMNAMELEN];
 883
 884         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 885
 886         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 887                 getroom(&CC->quickroom, hold_rm);
 888                 cprintf("%d You do not have a calendar.\n", ERROR);
 889                 return;
 890         }
 891
 892         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 893
 894         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 895                 NULL,
 896                 ical_hunt_for_conflicts_backend,
 897                 (void *) cal
 898         );
 899
 900         cprintf("000\n");
 901         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 902
 903 }
 904
 905
 906
 907 /*
 908  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 909  */
 910 void ical_conflicts(long msgnum, char *partnum) {
 911         struct CtdlMessage *msg;
 912         struct ical_respond_data ird;
 913
 914         msg = CtdlFetchMessage(msgnum);
 915         if (msg == NULL) {
 916                 cprintf("%d Message %ld not found.\n",
 917                         ERROR+ILLEGAL_VALUE,
 918                         (long)msgnum
 919                 );
 920                 return;
 921         }
 922
 923         memset(&ird, 0, sizeof ird);
 924         strcpy(ird.desired_partnum, partnum);
 925         mime_parser(msg->cm_fields['M'],
 926                 NULL,
 927                 *ical_locate_part,              /* callback function */
 928                 NULL, NULL,
 929                 (void *) &ird,                  /* user data */
 930                 0
 931         );
 932
 933         CtdlFreeMessage(msg);
 934
 935         if (ird.cal != NULL) {
 936                 ical_hunt_for_conflicts(ird.cal);
 937                 icalcomponent_free(ird.cal);
 938                 return;
 939         }
 940         else {
 941                 cprintf("%d No calendar object found\n", ERROR);
 942                 return;
 943         }
 944
 945         /* should never get here */
 946 }
 947
 948
 949
 950
 951 /*
 952  * All Citadel calendar commands from the client come through here.
 953  */
 954 void cmd_ical(char *argbuf)
 955 {
 956         char subcmd[SIZ];
 957         long msgnum;
 958         char partnum[SIZ];
 959         char action[SIZ];
 960
 961         if (CtdlAccessCheck(ac_logged_in)) return;
 962
 963         extract(subcmd, argbuf, 0);
 964
 965         if (!strcmp(subcmd, "test")) {
 966                 cprintf("%d This server supports calendaring\n", CIT_OK);
 967                 return;
 968         }
 969
 970         else if (!strcmp(subcmd, "respond")) {
 971                 msgnum = extract_long(argbuf, 1);
 972                 extract(partnum, argbuf, 2);
 973                 extract(action, argbuf, 3);
 974                 ical_respond(msgnum, partnum, action);
 975         }
 976
 977         else if (!strcmp(subcmd, "handle_rsvp")) {
 978                 msgnum = extract_long(argbuf, 1);
 979                 extract(partnum, argbuf, 2);
 980                 extract(action, argbuf, 3);
 981                 ical_handle_rsvp(msgnum, partnum, action);
 982         }
 983
 984         else if (!strcmp(subcmd, "conflicts")) {
 985                 msgnum = extract_long(argbuf, 1);
 986                 extract(partnum, argbuf, 2);
 987                 ical_conflicts(msgnum, partnum);
 988         }
 989
 990         else {
 991                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 992                 return;
 993         }
 994
 995         /* should never get here */
 996 }
 997
 998
 999
1000 /*
1001  * We don't know if the calendar room exists so we just create it at login
1002  */
1003 void ical_create_room(void)
1004 {
1005         struct quickroom qr;
1006         struct visit vbuf;
1007
1008         /* Create the calendar room if it doesn't already exist */
1009         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
1010
1011         /* Set expiration policy to manual; otherwise objects will be lost! */
1012         if (lgetroom(&qr, USERCALENDARROOM)) {
1013                 lprintf(3, "Couldn't get the user calendar room!\n");
1014                 return;
1015         }
1016         qr.QRep.expire_mode = EXPIRE_MANUAL;
1017         lputroom(&qr);
1018
1019         /* Set the view to a calendar view */
1020         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1021         vbuf.v_view = 3;        /* 3 = calendar */
1022         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1023
1024         /* Create the tasks list room if it doesn't already exist */
1025         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
1026
1027         /* Set expiration policy to manual; otherwise objects will be lost! */
1028         if (lgetroom(&qr, USERTASKSROOM)) {
1029                 lprintf(3, "Couldn't get the user calendar room!\n");
1030                 return;
1031         }
1032         qr.QRep.expire_mode = EXPIRE_MANUAL;
1033         lputroom(&qr);
1034
1035         /* Set the view to a task list view */
1036         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1037         vbuf.v_view = 4;        /* 4 = tasks */
1038         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1039
1040         return;
1041 }
1042
1043
1044 /*
1045  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1046  * finds a VEVENT.
1047  */
1048 void ical_send_out_invitations(icalcomponent *cal) {
1049         icalcomponent *the_request = NULL;
1050         char *serialized_request = NULL;
1051         char *request_message_text = NULL;
1052         struct CtdlMessage *msg = NULL;
1053         struct recptypes *valid = NULL;
1054         char attendees_string[SIZ];
1055         int num_attendees = 0;
1056         char this_attendee[SIZ];
1057         icalproperty *attendee = NULL;
1058         char summary_string[SIZ];
1059         icalproperty *summary = NULL;
1060         icalcomponent *encaps = NULL;
1061
1062         if (cal == NULL) {
1063                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
1064                 return;
1065         }
1066
1067         /* Clone the event */
1068         the_request = icalcomponent_new_clone(cal);
1069         if (the_request == NULL) {
1070                 lprintf(3, "ERROR: cannot clone calendar object\n");
1071                 return;
1072         }
1073         ical_dezonify(the_request);
1074
1075         /* Extract the summary string -- we'll use it as the
1076          * message subject for the request
1077          */
1078         strcpy(summary_string, "Meeting request");
1079         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1080         if (summary != NULL) {
1081                 if (icalproperty_get_summary(summary)) {
1082                         strcpy(summary_string,
1083                                 icalproperty_get_summary(summary) );
1084                 }
1085         }
1086
1087         /* Determine who the recipients of this message are (the attendees) */
1088         strcpy(attendees_string, "");
1089         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1090                 if (icalproperty_get_attendee(attendee)) {
1091                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1092                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1093                                 strcpy(this_attendee, &this_attendee[7]);
1094                                 snprintf(&attendees_string[strlen(attendees_string)],
1095                                         sizeof(attendees_string) - strlen(attendees_string),
1096                                         "%s, ",
1097                                         this_attendee
1098                                 );
1099                                 ++num_attendees;
1100                         }
1101                 }
1102         }
1103
1104         lprintf(9, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1105
1106         /* If there are no attendees, there are no invitations to send, so...
1107          * don't bother putting one together!  Punch out, Maverick!
1108          */
1109         if (num_attendees == 0) {
1110                 icalcomponent_free(the_request);
1111                 return;
1112         }
1113
1114         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1115         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
1116         if (encaps == NULL) {
1117                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
1118                         __FILE__, __LINE__);
1119                 icalcomponent_free(the_request);
1120                 return;
1121         }
1122
1123         /* Set the Product ID */
1124         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1125
1126         /* Set the Version Number */
1127         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1128
1129         /* Set the method to REQUEST */
1130         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1131
1132         /* FIXME: here we need to insert a VTIMEZONE object. */
1133
1134         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1135          * are responsible for "the_request"'s memory -- it will be freed
1136          * when we free "encaps".
1137          */
1138         icalcomponent_add_component(encaps, the_request);
1139
1140         /* Serialize it */
1141         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1142         icalcomponent_free(encaps);     /* Don't need this anymore. */
1143         if (serialized_request == NULL) return;
1144
1145         request_message_text = mallok(strlen(serialized_request) + SIZ);
1146         if (request_message_text != NULL) {
1147                 sprintf(request_message_text,
1148                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1149                         serialized_request
1150                 );
1151
1152                 msg = CtdlMakeMessage(&CC->usersupp,
1153                         "",                     /* No single recipient here */
1154                         CC->quickroom.QRname, 0, FMT_RFC822,
1155                         "",
1156                         summary_string,         /* Use summary for subject */
1157                         request_message_text);
1158
1159                 if (msg != NULL) {
1160                         valid = validate_recipients(attendees_string);
1161                         CtdlSubmitMsg(msg, valid, "");
1162                         CtdlFreeMessage(msg);
1163                 }
1164         }
1165         phree(serialized_request);
1166 }
1167
1168
1169 /*
1170  * When a calendar object is being saved, determine whether it's a VEVENT
1171  * and the user saving it is the organizer.  If so, send out invitations
1172  * to any listed attendees.
1173  *
1174  */
1175 void ical_saving_vevent(icalcomponent *cal) {
1176         icalcomponent *c;
1177         icalproperty *organizer = NULL;
1178         char organizer_string[SIZ];
1179
1180         /* Don't send out invitations if we've been asked not to. */
1181         lprintf(9, "CIT_ICAL->avoid_sending_invitations = %d\n",
1182                 CIT_ICAL->avoid_sending_invitations);
1183         if (CIT_ICAL->avoid_sending_invitations > 0) {
1184                 return;
1185         }
1186
1187         strcpy(organizer_string, "");
1188         /*
1189          * The VEVENT subcomponent is the one we're interested in.
1190          * Send out invitations if, and only if, this user is the Organizer.
1191          */
1192         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1193                 organizer = icalcomponent_get_first_property(cal,
1194                                                 ICAL_ORGANIZER_PROPERTY);
1195                 if (organizer != NULL) {
1196                         if (icalproperty_get_organizer(organizer)) {
1197                                 strcpy(organizer_string,
1198                                         icalproperty_get_organizer(organizer));
1199                         }
1200                 }
1201                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1202                         strcpy(organizer_string, &organizer_string[7]);
1203                         striplt(organizer_string);
1204                         /*
1205                          * If the user saving the event is listed as the
1206                          * organizer, then send out invitations.
1207                          */
1208                         if (CtdlIsMe(organizer_string)) {
1209                                 ical_send_out_invitations(cal);
1210                         }
1211                 }
1212         }
1213
1214         /* If the component has subcomponents, recurse through them. */
1215         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1216             (c != NULL);
1217             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1218                 /* Recursively process subcomponent */
1219                 ical_saving_vevent(c);
1220         }
1221
1222 }
1223
1224
1225
1226 /*
1227  * Back end for ical_obj_beforesave()
1228  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1229  * the summary of the event (becomes message subject),
1230  * and the start time (becomes message date/time).
1231  */
1232 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1233                 char *disp, void *content, char *cbtype, size_t length,
1234                 char *encoding, void *cbuserdata)
1235 {
1236         icalcomponent *cal;
1237         icalproperty *p;
1238         struct icalmessagemod *imm;
1239
1240         imm = (struct icalmessagemod *)cbuserdata;
1241
1242         /* If this is a text/calendar object, hunt for the UID and drop it in
1243          * the "user data" pointer for the MIME parser.  When
1244          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1245          * to that string.
1246          */
1247         if (!strcasecmp(cbtype, "text/calendar")) {
1248                 cal = icalcomponent_new_from_string(content);
1249                 ical_dezonify(cal);
1250                 if (cal != NULL) {
1251                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1252                         if (p != NULL) {
1253                                 strcpy(imm->uid, icalproperty_get_comment(p));
1254                         }
1255                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1256                         if (p != NULL) {
1257                                 strcpy(imm->subject,
1258                                                 icalproperty_get_comment(p));
1259                         }
1260                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1261                         if (p != NULL) {
1262                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1263                         }
1264                         icalcomponent_free(cal);
1265                 }
1266         }
1267 }
1268
1269
1270
1271
1272
1273 /*
1274  * See if we need to prevent the object from being saved (we don't allow
1275  * MIME types other than text/calendar in the Calendar> room).  Also, when
1276  * saving an event to the calendar, set the message's Citadel extended message
1277  * ID to the UID of the object.  This causes our replication checker to
1278  * automatically delete any existing instances of the same object.  (Isn't
1279  * that cool?)
1280  *
1281  * We also set the message's Subject to the event summary, and the Date/time to
1282  * the event start time.
1283  */
1284 int ical_obj_beforesave(struct CtdlMessage *msg)
1285 {
1286         char roomname[ROOMNAMELEN];
1287         char *p;
1288         int a;
1289         struct icalmessagemod imm;
1290
1291         /*
1292          * Only messages with content-type text/calendar
1293          * may be saved to Calendar>.  If the message is bound for
1294          * Calendar> but doesn't have this content-type, throw an error
1295          * so that the message may not be posted.
1296          */
1297
1298         /* First determine if this is our room */
1299         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1300         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1301                 return 0;       /* It's not the Calendar room. */
1302         }
1303
1304         /* Then determine content-type of the message */
1305
1306         /* It must be an RFC822 message! */
1307         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1308         if (msg->cm_format_type != 4)
1309                 return 1;       /* You tried to save a non-RFC822 message! */
1310
1311         /* Find the Content-Type: header */
1312         p = msg->cm_fields['M'];
1313         a = strlen(p);
1314         while (--a > 0) {
1315                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1316                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1317                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1318                                 mime_parser(msg->cm_fields['M'],
1319                                         NULL,
1320                                         *ical_ctdl_set_extended_msgid,
1321                                         NULL, NULL,
1322                                         (void *)&imm,
1323                                         0
1324                                 );
1325                                 if (strlen(imm.uid) > 0) {
1326                                         if (msg->cm_fields['E'] != NULL) {
1327                                                 phree(msg->cm_fields['E']);
1328                                         }
1329                                         msg->cm_fields['E'] = strdoop(imm.uid);
1330                                 }
1331                                 if (strlen(imm.subject) > 0) {
1332                                         if (msg->cm_fields['U'] != NULL) {
1333                                                 phree(msg->cm_fields['U']);
1334                                         }
1335                                         msg->cm_fields['U'] = strdoop(imm.subject);
1336                                 }
1337                                 if (imm.dtstart > 0) {
1338                                         if (msg->cm_fields['T'] != NULL) {
1339                                                 phree(msg->cm_fields['T']);
1340                                         }
1341                                         msg->cm_fields['T'] = strdoop("000000000000000000");
1342                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1343                                 }
1344                                 return 0;
1345                         }
1346                         else {
1347                                 return 1;
1348                         }
1349                 }
1350                 p++;
1351         }
1352
1353         /* Oops!  No Content-Type in this message!  How'd that happen? */
1354         lprintf(7, "RFC822 message with no Content-Type header!\n");
1355         return 1;
1356 }
1357
1358
1359 /*
1360  * Things we need to do after saving a calendar event.
1361  */
1362 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1363                 char *disp, void *content, char *cbtype, size_t length,
1364                 char *encoding, void *cbuserdata)
1365 {
1366         icalcomponent *cal;
1367
1368         /* If this is a text/calendar object, hunt for the UID and drop it in
1369          * the "user data" pointer for the MIME parser.  When
1370          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1371          * to that string.
1372          */
1373         if (!strcasecmp(cbtype, "text/calendar")) {
1374                 cal = icalcomponent_new_from_string(content);
1375                 if (cal != NULL) {
1376                         ical_dezonify(cal);
1377                         ical_saving_vevent(cal);
1378                         icalcomponent_free(cal);
1379                 }
1380         }
1381 }
1382
1383
1384 /*
1385  * Things we need to do after saving a calendar event.
1386  */
1387 int ical_obj_aftersave(struct CtdlMessage *msg)
1388 {
1389         char roomname[ROOMNAMELEN];
1390         char *p;
1391         int a;
1392
1393         /*
1394          * If this isn't the Calendar> room, no further action is necessary.
1395          */
1396
1397         /* First determine if this is our room */
1398         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1399         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1400                 return 0;       /* It's not the Calendar room. */
1401         }
1402
1403         /* Then determine content-type of the message */
1404
1405         /* It must be an RFC822 message! */
1406         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1407         if (msg->cm_format_type != 4) return(1);
1408
1409         /* Find the Content-Type: header */
1410         p = msg->cm_fields['M'];
1411         a = strlen(p);
1412         while (--a > 0) {
1413                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1414                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1415                                 mime_parser(msg->cm_fields['M'],
1416                                         NULL,
1417                                         *ical_obj_aftersave_backend,
1418                                         NULL, NULL,
1419                                         NULL,
1420                                         0
1421                                 );
1422                                 return 0;
1423                         }
1424                         else {
1425                                 return 1;
1426                         }
1427                 }
1428                 p++;
1429         }
1430
1431         /* Oops!  No Content-Type in this message!  How'd that happen? */
1432         lprintf(7, "RFC822 message with no Content-Type header!\n");
1433         return 1;
1434 }
1435
1436
1437 void ical_session_startup(void) {
1438         SYM_CIT_ICAL = CtdlGetDynamicSymbol();
1439         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1440         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1441
1442 }
1443
1444
1445 #endif  /* HAVE_ICAL_H */
1446
1447 /*
1448  * Register this module with the Citadel server.
1449  */
1450 char *Dynamic_Module_Init(void)
1451 {
1452 #ifdef HAVE_ICAL_H
1453         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1454         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1455         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1456         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1457         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1458 #endif
1459         return "$Id$";
1460 }