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 "serv_extensions.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 CITADEL_WITH_CALENDAR_SERVICE
  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         if (the_reply == NULL) {
 143                 lprintf(3, "ERROR: cannot clone request\n");
 144                 return;
 145         }
 146
 147         /* Change the method from REQUEST to REPLY */
 148         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 149
 150         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 151         if (vevent != NULL) {
 152                 /* Hunt for attendees, removing ones that aren't us.
 153                  * (Actually, remove them all, cloning our own one so we can
 154                  * re-insert it later)
 155                  */
 156                 while (attendee = icalcomponent_get_first_property(vevent,
 157                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 158                 ) {
 159                         if (icalproperty_get_attendee(attendee)) {
 160                                 strcpy(attendee_string,
 161                                         icalproperty_get_attendee(attendee) );
 162                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 163                                         strcpy(attendee_string, &attendee_string[7]);
 164                                         striplt(attendee_string);
 165                                         recp = validate_recipients(attendee_string);
 166                                         if (recp != NULL) {
 167                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 168                                                         if (me_attend) icalproperty_free(me_attend);
 169                                                         me_attend = icalproperty_new_clone(attendee);
 170                                                 }
 171                                                 phree(recp);
 172                                         }
 173                                 }
 174                         }
 175                         /* Remove it... */
 176                         icalcomponent_remove_property(vevent, attendee);
 177                         icalproperty_free(attendee);
 178                 }
 179
 180                 /* We found our own address in the attendee list. */
 181                 if (me_attend) {
 182                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 183                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 184
 185                         if (!strcasecmp(action, "accept")) {
 186                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 187                         }
 188                         else if (!strcasecmp(action, "decline")) {
 189                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 190                         }
 191                         else if (!strcasecmp(action, "tentative")) {
 192                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 193                         }
 194
 195                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 196
 197                         /* Now insert it back into the vevent. */
 198                         icalcomponent_add_property(vevent, me_attend);
 199                 }
 200
 201                 /* Figure out who to send this thing to */
 202                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 203                 if (organizer != NULL) {
 204                         if (icalproperty_get_organizer(organizer)) {
 205                                 strcpy(organizer_string,
 206                                         icalproperty_get_organizer(organizer) );
 207                         }
 208                 }
 209                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 210                         strcpy(organizer_string, &organizer_string[7]);
 211                         striplt(organizer_string);
 212                 } else {
 213                         strcpy(organizer_string, "");
 214                 }
 215
 216                 /* Extract the summary string -- we'll use it as the
 217                  * message subject for the reply
 218                  */
 219                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 220                 if (summary != NULL) {
 221                         if (icalproperty_get_summary(summary)) {
 222                                 strcpy(summary_string,
 223                                         icalproperty_get_summary(summary) );
 224                         }
 225                 }
 226
 227         }
 228
 229         /* Now generate the reply message and send it out. */
 230         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 231         icalcomponent_free(the_reply);  /* don't need this anymore */
 232         if (serialized_reply == NULL) return;
 233
 234         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 235         if (reply_message_text != NULL) {
 236                 sprintf(reply_message_text,
 237                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 238                         serialized_reply
 239                 );
 240
 241                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 242                         CC->quickroom.QRname, 0, FMT_RFC822,
 243                         "",
 244                         summary_string,         /* Use summary for subject */
 245                         reply_message_text);
 246
 247                 if (msg != NULL) {
 248                         valid = validate_recipients(organizer_string);
 249                         CtdlSubmitMsg(msg, valid, "");
 250                         CtdlFreeMessage(msg);
 251                 }
 252         }
 253         phree(serialized_reply);
 254 }
 255
 256
 257
 258 /*
 259  * Callback function for mime parser that hunts for calendar content types
 260  * and turns them into calendar objects
 261  */
 262 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 263                 void *content, char *cbtype, size_t length, char *encoding,
 264                 void *cbuserdata) {
 265
 266         struct ical_respond_data *ird = NULL;
 267
 268         ird = (struct ical_respond_data *) cbuserdata;
 269         if (ird->cal != NULL) {
 270                 icalcomponent_free(ird->cal);
 271                 ird->cal = NULL;
 272         }
 273         if (strcasecmp(partnum, ird->desired_partnum)) return;
 274         ird->cal = icalcomponent_new_from_string(content);
 275         if (ird->cal != NULL) {
 276                 ical_dezonify(ird->cal);
 277         }
 278 }
 279
 280
 281 /*
 282  * Respond to a meeting request.
 283  */
 284 void ical_respond(long msgnum, char *partnum, char *action) {
 285         struct CtdlMessage *msg;
 286         struct ical_respond_data ird;
 287
 288         if (
 289            (strcasecmp(action, "accept"))
 290            && (strcasecmp(action, "decline"))
 291         ) {
 292                 cprintf("%d Action must be 'accept' or 'decline'\n",
 293                         ERROR + ILLEGAL_VALUE
 294                 );
 295                 return;
 296         }
 297
 298         msg = CtdlFetchMessage(msgnum);
 299         if (msg == NULL) {
 300                 cprintf("%d Message %ld not found.\n",
 301                         ERROR+ILLEGAL_VALUE,
 302                         (long)msgnum
 303                 );
 304                 return;
 305         }
 306
 307         memset(&ird, 0, sizeof ird);
 308         strcpy(ird.desired_partnum, partnum);
 309         mime_parser(msg->cm_fields['M'],
 310                 NULL,
 311                 *ical_locate_part,              /* callback function */
 312                 NULL, NULL,
 313                 (void *) &ird,                  /* user data */
 314                 0
 315         );
 316
 317         /* We're done with the incoming message, because we now have a
 318          * calendar object in memory.
 319          */
 320         CtdlFreeMessage(msg);
 321
 322         /*
 323          * Here is the real meat of this function.  Handle the event.
 324          */
 325         if (ird.cal != NULL) {
 326                 /* Save this in the user's calendar if necessary */
 327                 if (!strcasecmp(action, "accept")) {
 328                         ical_add(ird.cal, 0);
 329                 }
 330
 331                 /* Send a reply if necessary */
 332                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 333                         ical_send_a_reply(ird.cal, action);
 334                 }
 335
 336                 /* Now that we've processed this message, we don't need it
 337                  * anymore.  So delete it.
 338                  */
 339                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 340
 341                 /* Free the memory we allocated and return a response. */
 342                 icalcomponent_free(ird.cal);
 343                 ird.cal = NULL;
 344                 cprintf("%d ok\n", CIT_OK);
 345                 return;
 346         }
 347         else {
 348                 cprintf("%d No calendar object found\n", ERROR);
 349                 return;
 350         }
 351
 352         /* should never get here */
 353 }
 354
 355
 356 /*
 357  * Figure out the UID of the calendar event being referred to in a
 358  * REPLY object.  This function is recursive.
 359  */
 360 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 361         icalcomponent *subcomponent;
 362         icalproperty *p;
 363
 364         /* If this object is a REPLY, then extract the UID. */
 365         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 366                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 367                 if (p != NULL) {
 368                         strcpy(uidbuf, icalproperty_get_comment(p));
 369                 }
 370         }
 371
 372         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 373          * UID of the reply; we want the UID of the invitation being replied to.
 374          */
 375         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 376             subcomponent != NULL;
 377             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 378                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 379         }
 380 }
 381
 382
 383 /*
 384  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 385  * locate the message containing the calendar event we're replying to, this function
 386  * gets called.  It basically just sticks the message number in a supplied buffer.
 387  */
 388 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 389         long *msgnumptr;
 390
 391         msgnumptr = (long *) data;
 392         *msgnumptr = msgnum;
 393 }
 394
 395
 396 struct original_event_container {
 397         icalcomponent *c;
 398 };
 399
 400 /*
 401  * Callback function for mime parser that hunts for calendar content types
 402  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 403  * to fetch the object being updated)
 404  */
 405 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 406                 void *content, char *cbtype, size_t length, char *encoding,
 407                 void *cbuserdata) {
 408
 409         struct original_event_container *oec = NULL;
 410
 411         if (strcasecmp(cbtype, "text/calendar")) {
 412                 return;
 413         }
 414         oec = (struct original_event_container *) cbuserdata;
 415         if (oec->c != NULL) {
 416                 icalcomponent_free(oec->c);
 417         }
 418         oec->c = icalcomponent_new_from_string(content);
 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
 455         /* At this point we're looking at the correct subcomponents.
 456          * Iterate through the attendees looking for a match.
 457          */
 458 STARTOVER:
 459         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 460             e_attendee != NULL;
 461             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 462
 463                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 464                     r_attendee != NULL;
 465                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 466
 467                         /* Check to see if these two attendees match...
 468                          */
 469                         if (!strcasecmp(
 470                            icalproperty_get_attendee(e_attendee),
 471                            icalproperty_get_attendee(r_attendee)
 472                         )) {
 473                                 /* ...and if they do, remove the attendee from the event
 474                                  * and replace it with the attendee from the reply.  (The
 475                                  * reply's copy will have the same address, but an updated
 476                                  * status.)
 477                                  */
 478                                 TRACE;
 479                                 icalcomponent_remove_property(event, e_attendee);
 480                                 TRACE;
 481                                 icalproperty_free(e_attendee);
 482                                 TRACE;
 483                                 icalcomponent_remove_property(reply, r_attendee);
 484                                 TRACE;
 485                                 icalcomponent_add_property(event, r_attendee);
 486                                 TRACE;
 487
 488                                 /* Since we diddled both sets of attendees, we have to start
 489                                  * the iteration over again.  This will not create an infinite
 490                                  * loop because we removed the attendee from the reply.  (That's
 491                                  * why we cloned the reply, and that's what we mean by "ripping
 492                                  * its guts out.")
 493                                  */
 494                                 goto STARTOVER;
 495                         }
 496
 497                 }
 498         }
 499
 500         /* Free the *clone* of the reply. */
 501         icalcomponent_free(reply);
 502 }
 503
 504
 505
 506
 507 /*
 508  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 509  * calendar event.  The object has already been deserialized for us; all
 510  * we have to do here is hunt for the event in our calendar, merge in the
 511  * updated attendee status, and save it again.
 512  *
 513  * This function returns 0 on success, 1 if the event was not found in the
 514  * user's calendar, or 2 if an internal error occurred.
 515  */
 516 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 517         char uid[SIZ];
 518         char hold_rm[ROOMNAMELEN];
 519         long msgnum_being_replaced = 0;
 520         struct CtdlMessage *template = NULL;
 521         struct CtdlMessage *msg;
 522         struct original_event_container oec;
 523         icalcomponent *original_event;
 524         char *serialized_event = NULL;
 525         char roomname[ROOMNAMELEN];
 526         char *message_text = NULL;
 527
 528         /* Figure out just what event it is we're dealing with */
 529         strcpy(uid, "--==<< InVaLiD uId >>==--");
 530         ical_learn_uid_of_reply(uid, cal);
 531         lprintf(9, "UID of event being replied to is <%s>\n", uid);
 532
 533         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 534
 535         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 536                 getroom(&CC->quickroom, hold_rm);
 537                 lprintf(3, "cannot get user calendar room\n");
 538                 return(2);
 539         }
 540
 541         /*
 542          * Pound through the user's calendar looking for a message with
 543          * the Citadel EUID set to the value we're looking for.  Since
 544          * Citadel always sets the message EUID to the vCalendar UID of
 545          * the event, this will work.
 546          */
 547         template = (struct CtdlMessage *)
 548                 mallok(sizeof(struct CtdlMessage));
 549         memset(template, 0, sizeof(struct CtdlMessage));
 550         template->cm_fields['E'] = strdoop(uid);
 551         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 552                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 553         CtdlFreeMessage(template);
 554         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 555
 556         lprintf(9, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 557         if (msgnum_being_replaced == 0) {
 558                 return(1);                      /* no calendar event found */
 559         }
 560
 561         /* Now we know the ID of the message containing the event being updated.
 562          * We don't actually have to delete it; that'll get taken care of by the
 563          * server when we save another event with the same UID.  This just gives
 564          * us the ability to load the event into memory so we can diddle the
 565          * attendees.
 566          */
 567         msg = CtdlFetchMessage(msgnum_being_replaced);
 568         if (msg == NULL) {
 569                 return(2);                      /* internal error */
 570         }
 571         oec.c = NULL;
 572         mime_parser(msg->cm_fields['M'],
 573                 NULL,
 574                 *ical_locate_original_event,    /* callback function */
 575                 NULL, NULL,
 576                 &oec,                           /* user data */
 577                 0
 578         );
 579         CtdlFreeMessage(msg);
 580
 581         original_event = oec.c;
 582         if (original_event == NULL) {
 583                 lprintf(3, "ERROR: Original_component is NULL.\n");
 584                 return(2);
 585         }
 586
 587         /* Merge the attendee's updated status into the event */
 588         ical_merge_attendee_reply(original_event, cal);
 589
 590         /* Serialize it */
 591         serialized_event = strdoop(icalcomponent_as_ical_string(original_event));
 592         icalcomponent_free(original_event);     /* Don't need this anymore. */
 593         if (serialized_event == NULL) return(2);
 594
 595         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 596
 597         message_text = mallok(strlen(serialized_event) + SIZ);
 598         if (message_text != NULL) {
 599                 sprintf(message_text,
 600                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 601                         serialized_event
 602                 );
 603
 604                 msg = CtdlMakeMessage(&CC->usersupp,
 605                         "",                     /* No recipient */
 606                         roomname,
 607                         0, FMT_RFC822,
 608                         "",
 609                         "",             /* no subject */
 610                         message_text);
 611
 612                 if (msg != NULL) {
 613                         CIT_ICAL->avoid_sending_invitations = 1;
 614                         CtdlSubmitMsg(msg, NULL, roomname);
 615                         CtdlFreeMessage(msg);
 616                         CIT_ICAL->avoid_sending_invitations = 0;
 617                 }
 618         }
 619         phree(serialized_event);
 620         return(0);
 621 }
 622
 623
 624 /*
 625  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 626  * simply extracts the calendar object from the message, deserializes it, and
 627  * passes it up to ical_update_my_calendar_with_reply() for processing.
 628  */
 629 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 630         struct CtdlMessage *msg;
 631         struct ical_respond_data ird;
 632         int ret;
 633
 634         if (
 635            (strcasecmp(action, "update"))
 636            && (strcasecmp(action, "ignore"))
 637         ) {
 638                 cprintf("%d Action must be 'update' or 'ignore'\n",
 639                         ERROR + ILLEGAL_VALUE
 640                 );
 641                 return;
 642         }
 643
 644         msg = CtdlFetchMessage(msgnum);
 645         if (msg == NULL) {
 646                 cprintf("%d Message %ld not found.\n",
 647                         ERROR+ILLEGAL_VALUE,
 648                         (long)msgnum
 649                 );
 650                 return;
 651         }
 652
 653         memset(&ird, 0, sizeof ird);
 654         strcpy(ird.desired_partnum, partnum);
 655         mime_parser(msg->cm_fields['M'],
 656                 NULL,
 657                 *ical_locate_part,              /* callback function */
 658                 NULL, NULL,
 659                 (void *) &ird,                  /* user data */
 660                 0
 661         );
 662
 663         /* We're done with the incoming message, because we now have a
 664          * calendar object in memory.
 665          */
 666         CtdlFreeMessage(msg);
 667
 668         /*
 669          * Here is the real meat of this function.  Handle the event.
 670          */
 671         if (ird.cal != NULL) {
 672                 /* Update the user's calendar if necessary */
 673                 if (!strcasecmp(action, "update")) {
 674                         ret = ical_update_my_calendar_with_reply(ird.cal);
 675                         if (ret == 0) {
 676                                 cprintf("%d Your calendar has been updated with this reply.\n",
 677                                         CIT_OK);
 678                         }
 679                         else if (ret == 1) {
 680                                 cprintf("%d This event does not exist in your calendar.\n",
 681                                         ERROR + FILE_NOT_FOUND);
 682                         }
 683                         else {
 684                                 cprintf("%d An internal error occurred.\n",
 685                                         ERROR + INTERNAL_ERROR);
 686                         }
 687                 }
 688                 else {
 689                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 690                 }
 691
 692                 /* Now that we've processed this message, we don't need it
 693                  * anymore.  So delete it.  FIXME uncomment this when ready!
 694                  */
 695                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 696
 697                 /* Free the memory we allocated and return a response. */
 698                 icalcomponent_free(ird.cal);
 699                 ird.cal = NULL;
 700                 return;
 701         }
 702         else {
 703                 cprintf("%d No calendar object found\n", ERROR);
 704                 return;
 705         }
 706
 707         /* should never get here */
 708 }
 709
 710
 711 /*
 712  * Search for a property in both the top level and in a VEVENT subcomponent
 713  */
 714 icalproperty *ical_ctdl_get_subprop(
 715                 icalcomponent *cal,
 716                 icalproperty_kind which_prop
 717 ) {
 718         icalproperty *p;
 719         icalcomponent *c;
 720
 721         p = icalcomponent_get_first_property(cal, which_prop);
 722         if (p == NULL) {
 723                 c = icalcomponent_get_first_component(cal,
 724                                                         ICAL_VEVENT_COMPONENT);
 725                 if (c != NULL) {
 726                         p = icalcomponent_get_first_property(c, which_prop);
 727                 }
 728         }
 729         return p;
 730 }
 731
 732
 733 /*
 734  * Check to see if two events overlap.  Returns nonzero if they do.
 735  */
 736 int ical_ctdl_is_overlap(
 737                         struct icaltimetype t1start,
 738                         struct icaltimetype t1end,
 739                         struct icaltimetype t2start,
 740                         struct icaltimetype t2end
 741 ) {
 742
 743         if (icaltime_is_null_time(t1start)) return(0);
 744         if (icaltime_is_null_time(t2start)) return(0);
 745
 746         /* First, check for all-day events */
 747         if (t1start.is_date) {
 748                 if (!icaltime_compare_date_only(t1start, t2start)) {
 749                         return(1);
 750                 }
 751                 if (!icaltime_is_null_time(t2end)) {
 752                         if (!icaltime_compare_date_only(t1start, t2end)) {
 753                                 return(1);
 754                         }
 755                 }
 756         }
 757
 758         if (t2start.is_date) {
 759                 if (!icaltime_compare_date_only(t2start, t1start)) {
 760                         return(1);
 761                 }
 762                 if (!icaltime_is_null_time(t1end)) {
 763                         if (!icaltime_compare_date_only(t2start, t1end)) {
 764                                 return(1);
 765                         }
 766                 }
 767         }
 768
 769         /* Now check for overlaps using date *and* time. */
 770
 771         /* First, bail out if either event 1 or event 2 is missing end time. */
 772         if (icaltime_is_null_time(t1end)) return(0);
 773         if (icaltime_is_null_time(t2end)) return(0);
 774
 775         /* If event 1 ends before event 2 starts, we're in the clear. */
 776         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 777
 778         /* If event 2 ends before event 1 starts, we're also ok. */
 779         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 780
 781         /* Otherwise, they overlap. */
 782         return(1);
 783 }
 784
 785
 786
 787 /*
 788  * Backend for ical_hunt_for_conflicts()
 789  */
 790 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 791         icalcomponent *cal;
 792         struct CtdlMessage *msg;
 793         struct ical_respond_data ird;
 794         struct icaltimetype t1start, t1end, t2start, t2end;
 795         icalproperty *p;
 796         char conflict_event_uid[SIZ];
 797         char conflict_event_summary[SIZ];
 798         char compare_uid[SIZ];
 799
 800         cal = (icalcomponent *)data;
 801         strcpy(compare_uid, "");
 802         strcpy(conflict_event_uid, "");
 803         strcpy(conflict_event_summary, "");
 804
 805         msg = CtdlFetchMessage(msgnum);
 806         if (msg == NULL) return;
 807         memset(&ird, 0, sizeof ird);
 808         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 809         mime_parser(msg->cm_fields['M'],
 810                 NULL,
 811                 *ical_locate_part,              /* callback function */
 812                 NULL, NULL,
 813                 (void *) &ird,                  /* user data */
 814                 0
 815         );
 816         CtdlFreeMessage(msg);
 817
 818         if (ird.cal == NULL) return;
 819
 820         t1start = icaltime_null_time();
 821         t1end = icaltime_null_time();
 822         t2start = icaltime_null_time();
 823         t1end = icaltime_null_time();
 824
 825         /* Now compare cal to ird.cal */
 826         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 827         if (p == NULL) return;
 828         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 829
 830         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 831         if (p != NULL) t2end = icalproperty_get_dtend(p);
 832
 833         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 834         if (p == NULL) return;
 835         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 836
 837         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 838         if (p != NULL) t1end = icalproperty_get_dtend(p);
 839
 840         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 841         if (p != NULL) {
 842                 strcpy(compare_uid, icalproperty_get_comment(p));
 843         }
 844
 845         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 846         if (p != NULL) {
 847                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 848         }
 849
 850         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 851         if (p != NULL) {
 852                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 853         }
 854
 855
 856         icalcomponent_free(ird.cal);
 857
 858         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 859                 cprintf("%ld||%s|%s|%d|\n",
 860                         msgnum,
 861                         conflict_event_uid,
 862                         conflict_event_summary,
 863                         (       ((strlen(compare_uid)>0)
 864                                 &&(!strcasecmp(compare_uid,
 865                                 conflict_event_uid))) ? 1 : 0
 866                         )
 867                 );
 868         }
 869 }
 870
 871
 872
 873 /*
 874  * Phase 2 of "hunt for conflicts" operation.
 875  * At this point we have a calendar object which represents the VEVENT that
 876  * we're considering adding to the calendar.  Now hunt through the user's
 877  * calendar room, and output zero or more existing VEVENTs which conflict
 878  * with this one.
 879  */
 880 void ical_hunt_for_conflicts(icalcomponent *cal) {
 881         char hold_rm[ROOMNAMELEN];
 882
 883         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 884
 885         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 886                 getroom(&CC->quickroom, hold_rm);
 887                 cprintf("%d You do not have a calendar.\n", ERROR);
 888                 return;
 889         }
 890
 891         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 892
 893         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 894                 NULL,
 895                 ical_hunt_for_conflicts_backend,
 896                 (void *) cal
 897         );
 898
 899         cprintf("000\n");
 900         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 901
 902 }
 903
 904
 905
 906 /*
 907  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 908  */
 909 void ical_conflicts(long msgnum, char *partnum) {
 910         struct CtdlMessage *msg;
 911         struct ical_respond_data ird;
 912
 913         msg = CtdlFetchMessage(msgnum);
 914         if (msg == NULL) {
 915                 cprintf("%d Message %ld not found.\n",
 916                         ERROR+ILLEGAL_VALUE,
 917                         (long)msgnum
 918                 );
 919                 return;
 920         }
 921
 922         memset(&ird, 0, sizeof ird);
 923         strcpy(ird.desired_partnum, partnum);
 924         mime_parser(msg->cm_fields['M'],
 925                 NULL,
 926                 *ical_locate_part,              /* callback function */
 927                 NULL, NULL,
 928                 (void *) &ird,                  /* user data */
 929                 0
 930         );
 931
 932         CtdlFreeMessage(msg);
 933
 934         if (ird.cal != NULL) {
 935                 ical_hunt_for_conflicts(ird.cal);
 936                 icalcomponent_free(ird.cal);
 937                 return;
 938         }
 939         else {
 940                 cprintf("%d No calendar object found\n", ERROR);
 941                 return;
 942         }
 943
 944         /* should never get here */
 945 }
 946
 947
 948
 949 /*
 950  * Grab another user's free/busy times
 951  */
 952 void ical_freebusy(char *who) {
 953         struct usersupp usbuf;
 954         char calendar_room_name[ROOMNAMELEN];
 955         char hold_rm[ROOMNAMELEN];
 956
 957         if (getuser(&usbuf, who) != 0) {
 958                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
 959                 return;
 960         }
 961
 962         MailboxName(calendar_room_name, sizeof calendar_room_name,
 963                 &usbuf, USERCALENDARROOM);
 964
 965         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 966
 967         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 968                 cprintf("%d Cannot open calendar\n", ERROR+ROOM_NOT_FOUND);
 969                 getroom(&CC->quickroom, hold_rm);
 970                 return;
 971         }
 972
 973 /*
 974         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 975                 template, the_FIXME_function, NULL);
 976  */
 977
 978         /* Go back to the room from which we came... */
 979         getroom(&CC->quickroom, hold_rm);
 980
 981         cprintf("%d not implemented yet\n", ERROR);
 982 }
 983
 984
 985
 986
 987 /*
 988  * All Citadel calendar commands from the client come through here.
 989  */
 990 void cmd_ical(char *argbuf)
 991 {
 992         char subcmd[SIZ];
 993         long msgnum;
 994         char partnum[SIZ];
 995         char action[SIZ];
 996         char who[SIZ];
 997
 998         if (CtdlAccessCheck(ac_logged_in)) return;
 999
1000         extract(subcmd, argbuf, 0);
1001
1002         if (!strcmp(subcmd, "test")) {
1003                 cprintf("%d This server supports calendaring\n", CIT_OK);
1004                 return;
1005         }
1006
1007         else if (!strcmp(subcmd, "respond")) {
1008                 msgnum = extract_long(argbuf, 1);
1009                 extract(partnum, argbuf, 2);
1010                 extract(action, argbuf, 3);
1011                 ical_respond(msgnum, partnum, action);
1012         }
1013
1014         else if (!strcmp(subcmd, "handle_rsvp")) {
1015                 msgnum = extract_long(argbuf, 1);
1016                 extract(partnum, argbuf, 2);
1017                 extract(action, argbuf, 3);
1018                 ical_handle_rsvp(msgnum, partnum, action);
1019         }
1020
1021         else if (!strcmp(subcmd, "conflicts")) {
1022                 msgnum = extract_long(argbuf, 1);
1023                 extract(partnum, argbuf, 2);
1024                 ical_conflicts(msgnum, partnum);
1025         }
1026
1027         else if (!strcmp(subcmd, "freebusy")) {
1028                 extract(who, argbuf, 1);
1029                 ical_freebusy(who);
1030         }
1031
1032         else {
1033                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
1034                 return;
1035         }
1036
1037         /* should never get here */
1038 }
1039
1040
1041
1042 /*
1043  * We don't know if the calendar room exists so we just create it at login
1044  */
1045 void ical_create_room(void)
1046 {
1047         struct quickroom qr;
1048         struct visit vbuf;
1049
1050         /* Create the calendar room if it doesn't already exist */
1051         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
1052
1053         /* Set expiration policy to manual; otherwise objects will be lost! */
1054         if (lgetroom(&qr, USERCALENDARROOM)) {
1055                 lprintf(3, "Couldn't get the user calendar room!\n");
1056                 return;
1057         }
1058         qr.QRep.expire_mode = EXPIRE_MANUAL;
1059         qr.QRdefaultview = 3;   /* 3 = calendar view */
1060         lputroom(&qr);
1061
1062         /* Set the view to a calendar view */
1063         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1064         vbuf.v_view = 3;        /* 3 = calendar */
1065         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1066
1067         /* Create the tasks list room if it doesn't already exist */
1068         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
1069
1070         /* Set expiration policy to manual; otherwise objects will be lost! */
1071         if (lgetroom(&qr, USERTASKSROOM)) {
1072                 lprintf(3, "Couldn't get the user calendar room!\n");
1073                 return;
1074         }
1075         qr.QRep.expire_mode = EXPIRE_MANUAL;
1076         qr.QRdefaultview = 4;   /* 4 = tasks view */
1077         lputroom(&qr);
1078
1079         /* Set the view to a task list view */
1080         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1081         vbuf.v_view = 4;        /* 4 = tasks */
1082         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1083
1084         return;
1085 }
1086
1087
1088 /*
1089  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1090  * finds a VEVENT.
1091  */
1092 void ical_send_out_invitations(icalcomponent *cal) {
1093         icalcomponent *the_request = NULL;
1094         char *serialized_request = NULL;
1095         char *request_message_text = NULL;
1096         struct CtdlMessage *msg = NULL;
1097         struct recptypes *valid = NULL;
1098         char attendees_string[SIZ];
1099         int num_attendees = 0;
1100         char this_attendee[SIZ];
1101         icalproperty *attendee = NULL;
1102         char summary_string[SIZ];
1103         icalproperty *summary = NULL;
1104         icalcomponent *encaps = NULL;
1105
1106         if (cal == NULL) {
1107                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
1108                 return;
1109         }
1110
1111         /* Clone the event */
1112         the_request = icalcomponent_new_clone(cal);
1113         if (the_request == NULL) {
1114                 lprintf(3, "ERROR: cannot clone calendar object\n");
1115                 return;
1116         }
1117
1118         /* Extract the summary string -- we'll use it as the
1119          * message subject for the request
1120          */
1121         strcpy(summary_string, "Meeting request");
1122         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1123         if (summary != NULL) {
1124                 if (icalproperty_get_summary(summary)) {
1125                         strcpy(summary_string,
1126                                 icalproperty_get_summary(summary) );
1127                 }
1128         }
1129
1130         /* Determine who the recipients of this message are (the attendees) */
1131         strcpy(attendees_string, "");
1132         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1133                 if (icalproperty_get_attendee(attendee)) {
1134                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1135                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1136                                 strcpy(this_attendee, &this_attendee[7]);
1137                                 snprintf(&attendees_string[strlen(attendees_string)],
1138                                         sizeof(attendees_string) - strlen(attendees_string),
1139                                         "%s, ",
1140                                         this_attendee
1141                                 );
1142                                 ++num_attendees;
1143                         }
1144                 }
1145         }
1146
1147         lprintf(9, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1148
1149         /* If there are no attendees, there are no invitations to send, so...
1150          * don't bother putting one together!  Punch out, Maverick!
1151          */
1152         if (num_attendees == 0) {
1153                 icalcomponent_free(the_request);
1154                 return;
1155         }
1156
1157         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1158         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
1159         if (encaps == NULL) {
1160                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
1161                         __FILE__, __LINE__);
1162                 icalcomponent_free(the_request);
1163                 return;
1164         }
1165
1166         /* Set the Product ID */
1167         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1168
1169         /* Set the Version Number */
1170         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1171
1172         /* Set the method to REQUEST */
1173         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1174
1175         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1176         ical_dezonify(the_request);
1177
1178         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1179          * are responsible for "the_request"'s memory -- it will be freed
1180          * when we free "encaps".
1181          */
1182         icalcomponent_add_component(encaps, the_request);
1183
1184         /* Serialize it */
1185         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1186         icalcomponent_free(encaps);     /* Don't need this anymore. */
1187         if (serialized_request == NULL) return;
1188
1189         request_message_text = mallok(strlen(serialized_request) + SIZ);
1190         if (request_message_text != NULL) {
1191                 sprintf(request_message_text,
1192                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1193                         serialized_request
1194                 );
1195
1196                 msg = CtdlMakeMessage(&CC->usersupp,
1197                         "",                     /* No single recipient here */
1198                         CC->quickroom.QRname, 0, FMT_RFC822,
1199                         "",
1200                         summary_string,         /* Use summary for subject */
1201                         request_message_text);
1202
1203                 if (msg != NULL) {
1204                         valid = validate_recipients(attendees_string);
1205                         CtdlSubmitMsg(msg, valid, "");
1206                         CtdlFreeMessage(msg);
1207                 }
1208         }
1209         phree(serialized_request);
1210 }
1211
1212
1213 /*
1214  * When a calendar object is being saved, determine whether it's a VEVENT
1215  * and the user saving it is the organizer.  If so, send out invitations
1216  * to any listed attendees.
1217  *
1218  */
1219 void ical_saving_vevent(icalcomponent *cal) {
1220         icalcomponent *c;
1221         icalproperty *organizer = NULL;
1222         char organizer_string[SIZ];
1223
1224         /* Don't send out invitations if we've been asked not to. */
1225         lprintf(9, "CIT_ICAL->avoid_sending_invitations = %d\n",
1226                 CIT_ICAL->avoid_sending_invitations);
1227         if (CIT_ICAL->avoid_sending_invitations > 0) {
1228                 return;
1229         }
1230
1231         strcpy(organizer_string, "");
1232         /*
1233          * The VEVENT subcomponent is the one we're interested in.
1234          * Send out invitations if, and only if, this user is the Organizer.
1235          */
1236         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1237                 organizer = icalcomponent_get_first_property(cal,
1238                                                 ICAL_ORGANIZER_PROPERTY);
1239                 if (organizer != NULL) {
1240                         if (icalproperty_get_organizer(organizer)) {
1241                                 strcpy(organizer_string,
1242                                         icalproperty_get_organizer(organizer));
1243                         }
1244                 }
1245                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1246                         strcpy(organizer_string, &organizer_string[7]);
1247                         striplt(organizer_string);
1248                         /*
1249                          * If the user saving the event is listed as the
1250                          * organizer, then send out invitations.
1251                          */
1252                         if (CtdlIsMe(organizer_string)) {
1253                                 ical_send_out_invitations(cal);
1254                         }
1255                 }
1256         }
1257
1258         /* If the component has subcomponents, recurse through them. */
1259         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1260             (c != NULL);
1261             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1262                 /* Recursively process subcomponent */
1263                 ical_saving_vevent(c);
1264         }
1265
1266 }
1267
1268
1269
1270 /*
1271  * Back end for ical_obj_beforesave()
1272  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1273  * the summary of the event (becomes message subject),
1274  * and the start time (becomes message date/time).
1275  */
1276 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1277                 char *disp, void *content, char *cbtype, size_t length,
1278                 char *encoding, void *cbuserdata)
1279 {
1280         icalcomponent *cal;
1281         icalproperty *p;
1282         struct icalmessagemod *imm;
1283
1284         imm = (struct icalmessagemod *)cbuserdata;
1285
1286         /* If this is a text/calendar object, hunt for the UID and drop it in
1287          * the "user data" pointer for the MIME parser.  When
1288          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1289          * to that string.
1290          */
1291         if (!strcasecmp(cbtype, "text/calendar")) {
1292                 cal = icalcomponent_new_from_string(content);
1293                 if (cal != NULL) {
1294                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1295                         if (p != NULL) {
1296                                 strcpy(imm->uid, icalproperty_get_comment(p));
1297                         }
1298                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1299                         if (p != NULL) {
1300                                 strcpy(imm->subject,
1301                                                 icalproperty_get_comment(p));
1302                         }
1303                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1304                         if (p != NULL) {
1305                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1306                         }
1307                         icalcomponent_free(cal);
1308                 }
1309         }
1310 }
1311
1312
1313
1314
1315
1316 /*
1317  * See if we need to prevent the object from being saved (we don't allow
1318  * MIME types other than text/calendar in the Calendar> room).  Also, when
1319  * saving an event to the calendar, set the message's Citadel extended message
1320  * ID to the UID of the object.  This causes our replication checker to
1321  * automatically delete any existing instances of the same object.  (Isn't
1322  * that cool?)
1323  *
1324  * We also set the message's Subject to the event summary, and the Date/time to
1325  * the event start time.
1326  */
1327 int ical_obj_beforesave(struct CtdlMessage *msg)
1328 {
1329         char roomname[ROOMNAMELEN];
1330         char *p;
1331         int a;
1332         struct icalmessagemod imm;
1333
1334         /*
1335          * Only messages with content-type text/calendar
1336          * may be saved to Calendar>.  If the message is bound for
1337          * Calendar> but doesn't have this content-type, throw an error
1338          * so that the message may not be posted.
1339          */
1340
1341         /* First determine if this is our room */
1342         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1343         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1344                 return 0;       /* It's not the Calendar room. */
1345         }
1346
1347         /* Then determine content-type of the message */
1348
1349         /* It must be an RFC822 message! */
1350         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1351         if (msg->cm_format_type != 4)
1352                 return 1;       /* You tried to save a non-RFC822 message! */
1353
1354         /* Find the Content-Type: header */
1355         p = msg->cm_fields['M'];
1356         a = strlen(p);
1357         while (--a > 0) {
1358                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1359                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1360                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1361                                 mime_parser(msg->cm_fields['M'],
1362                                         NULL,
1363                                         *ical_ctdl_set_extended_msgid,
1364                                         NULL, NULL,
1365                                         (void *)&imm,
1366                                         0
1367                                 );
1368                                 if (strlen(imm.uid) > 0) {
1369                                         if (msg->cm_fields['E'] != NULL) {
1370                                                 phree(msg->cm_fields['E']);
1371                                         }
1372                                         msg->cm_fields['E'] = strdoop(imm.uid);
1373                                 }
1374                                 if (strlen(imm.subject) > 0) {
1375                                         if (msg->cm_fields['U'] != NULL) {
1376                                                 phree(msg->cm_fields['U']);
1377                                         }
1378                                         msg->cm_fields['U'] = strdoop(imm.subject);
1379                                 }
1380                                 if (imm.dtstart > 0) {
1381                                         if (msg->cm_fields['T'] != NULL) {
1382                                                 phree(msg->cm_fields['T']);
1383                                         }
1384                                         msg->cm_fields['T'] = strdoop("000000000000000000");
1385                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1386                                 }
1387                                 return 0;
1388                         }
1389                         else {
1390                                 return 1;
1391                         }
1392                 }
1393                 p++;
1394         }
1395
1396         /* Oops!  No Content-Type in this message!  How'd that happen? */
1397         lprintf(7, "RFC822 message with no Content-Type header!\n");
1398         return 1;
1399 }
1400
1401
1402 /*
1403  * Things we need to do after saving a calendar event.
1404  */
1405 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1406                 char *disp, void *content, char *cbtype, size_t length,
1407                 char *encoding, void *cbuserdata)
1408 {
1409         icalcomponent *cal;
1410
1411         /* If this is a text/calendar object, hunt for the UID and drop it in
1412          * the "user data" pointer for the MIME parser.  When
1413          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1414          * to that string.
1415          */
1416         if (!strcasecmp(cbtype, "text/calendar")) {
1417                 cal = icalcomponent_new_from_string(content);
1418                 if (cal != NULL) {
1419                         ical_saving_vevent(cal);
1420                         icalcomponent_free(cal);
1421                 }
1422         }
1423 }
1424
1425
1426 /*
1427  * Things we need to do after saving a calendar event.
1428  */
1429 int ical_obj_aftersave(struct CtdlMessage *msg)
1430 {
1431         char roomname[ROOMNAMELEN];
1432         char *p;
1433         int a;
1434
1435         /*
1436          * If this isn't the Calendar> room, no further action is necessary.
1437          */
1438
1439         /* First determine if this is our room */
1440         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1441         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1442                 return 0;       /* It's not the Calendar room. */
1443         }
1444
1445         /* Then determine content-type of the message */
1446
1447         /* It must be an RFC822 message! */
1448         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1449         if (msg->cm_format_type != 4) return(1);
1450
1451         /* Find the Content-Type: header */
1452         p = msg->cm_fields['M'];
1453         a = strlen(p);
1454         while (--a > 0) {
1455                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1456                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1457                                 mime_parser(msg->cm_fields['M'],
1458                                         NULL,
1459                                         *ical_obj_aftersave_backend,
1460                                         NULL, NULL,
1461                                         NULL,
1462                                         0
1463                                 );
1464                                 return 0;
1465                         }
1466                         else {
1467                                 return 1;
1468                         }
1469                 }
1470                 p++;
1471         }
1472
1473         /* Oops!  No Content-Type in this message!  How'd that happen? */
1474         lprintf(7, "RFC822 message with no Content-Type header!\n");
1475         return 1;
1476 }
1477
1478
1479 void ical_session_startup(void) {
1480         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1481         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1482 }
1483
1484
1485 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
1486
1487 /*
1488  * Register this module with the Citadel server.
1489  */
1490 char *serv_calendar_init(void)
1491 {
1492 #ifdef CITADEL_WITH_CALENDAR_SERVICE
1493         SYM_CIT_ICAL = CtdlGetDynamicSymbol();
1494         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1495         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1496         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1497         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1498         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1499 #endif
1500         return "$Id$";
1501 }