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 #include "sysdep.h"
  11 #include <unistd.h>
  12 #include <sys/types.h>
  13 #include <limits.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #ifdef HAVE_STRINGS_H
  17 #include <strings.h>
  18 #endif
  19 #include "serv_calendar.h"
  20 #include "citadel.h"
  21 #include "server.h"
  22 #include "citserver.h"
  23 #include "sysdep_decls.h"
  24 #include "support.h"
  25 #include "config.h"
  26 #include "dynloader.h"
  27 #include "user_ops.h"
  28 #include "room_ops.h"
  29 #include "tools.h"
  30 #include "msgbase.h"
  31 #include "mime_parser.h"
  32
  33
  34 #ifdef HAVE_ICAL_H
  35
  36 #include <ical.h>
  37
  38 struct ical_respond_data {
  39         char desired_partnum[SIZ];
  40         icalcomponent *cal;
  41 };
  42
  43
  44 /*
  45  * Write a calendar object into the specified user's calendar room.
  46  */
  47 void ical_write_to_cal(struct usersupp *u, icalcomponent *cal) {
  48         char temp[PATH_MAX];
  49         FILE *fp;
  50         char *ser;
  51
  52         strcpy(temp, tmpnam(NULL));
  53         ser = icalcomponent_as_ical_string(cal);
  54         if (ser == NULL) return;
  55
  56         /* Make a temp file out of it */
  57         fp = fopen(temp, "w");
  58         if (fp == NULL) return;
  59         fwrite(ser, strlen(ser), 1, fp);
  60         fclose(fp);
  61
  62         /* This handy API function does all the work for us.
  63          */
  64         CtdlWriteObject(USERCALENDARROOM,       /* which room */
  65                         "text/calendar",        /* MIME type */
  66                         temp,                   /* temp file */
  67                         u,                      /* which user */
  68                         0,                      /* not binary */
  69                         0,              /* don't delete others of this type */
  70                         0);                     /* no flags */
  71
  72         unlink(temp);
  73 }
  74
  75
  76 /*
  77  * Add a calendar object to the user's calendar
  78  */
  79 void ical_add(icalcomponent *cal, int recursion_level) {
  80         icalcomponent *c;
  81
  82         /*
  83          * The VEVENT subcomponent is the one we're interested in saving.
  84          */
  85         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
  86
  87                 ical_write_to_cal(&CC->usersupp, cal);
  88
  89         }
  90
  91         /* If the component has subcomponents, recurse through them. */
  92         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
  93             (c != 0);
  94             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
  95                 /* Recursively process subcomponent */
  96                 ical_add(c, recursion_level+1);
  97         }
  98
  99 }
 100
 101
 102
 103 /*
 104  * Send a reply to a meeting invitation.
 105  *
 106  * 'request' is the invitation to reply to.
 107  * 'action' is the string "accept" or "decline".
 108  *
 109  * (Sorry about this being more than 80 columns ... there was just
 110  * no easy way to break it down sensibly.)
 111  */
 112 void ical_send_a_reply(icalcomponent *request, char *action) {
 113         icalcomponent *the_reply = NULL;
 114         icalcomponent *vevent = NULL;
 115         icalproperty *attendee = NULL;
 116         char attendee_string[SIZ];
 117         icalproperty *organizer = NULL;
 118         char organizer_string[SIZ];
 119         icalproperty *me_attend = NULL;
 120         struct recptypes *recp = NULL;
 121         icalparameter *partstat = NULL;
 122         char *serialized_reply = NULL;
 123         char *reply_message_text = NULL;
 124         struct CtdlMessage *msg = NULL;
 125         struct recptypes *valid = NULL;
 126
 127         strcpy(organizer_string, "");
 128
 129         if (request == NULL) {
 130                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 131                 return;
 132         }
 133
 134         the_reply = icalcomponent_new_clone(request);
 135         if (the_reply == NULL) {
 136                 lprintf(3, "ERROR: cannot clone request\n");
 137                 return;
 138         }
 139
 140         /* Change the method from REQUEST to REPLY */
 141         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 142
 143         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 144         if (vevent != NULL) {
 145                 /* Hunt for attendees, removing ones that aren't us.
 146                  * (Actually, remove them all, cloning our own one so we can
 147                  * re-insert it later)
 148                  */
 149                 while (attendee = icalcomponent_get_first_property(vevent,
 150                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 151                 ) {
 152                         if (icalproperty_get_attendee(attendee)) {
 153                                 strcpy(attendee_string,
 154                                         icalproperty_get_attendee(attendee) );
 155                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 156                                         strcpy(attendee_string, &attendee_string[7]);
 157                                         striplt(attendee_string);
 158                                         recp = validate_recipients(attendee_string);
 159                                         if (recp != NULL) {
 160                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 161                                                         if (me_attend) icalproperty_free(me_attend);
 162                                                         me_attend = icalproperty_new_clone(attendee);
 163                                                 }
 164                                                 phree(recp);
 165                                         }
 166                                 }
 167                         }
 168                         /* Remove it... */
 169                         icalcomponent_remove_property(vevent, attendee);
 170                 }
 171
 172                 /* We found our own address in the attendee list. */
 173                 if (me_attend) {
 174                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 175                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 176
 177                         if (!strcasecmp(action, "accept")) {
 178                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 179                         }
 180                         else if (!strcasecmp(action, "decline")) {
 181                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 182                         }
 183                         else if (!strcasecmp(action, "tentative")) {
 184                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 185                         }
 186
 187                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 188
 189                         /* Now insert it back into the vevent. */
 190                         icalcomponent_add_property(vevent, me_attend);
 191                 }
 192
 193                 /* Figure out who to send this thing to */
 194                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 195                 if (organizer != NULL) {
 196                         if (icalproperty_get_organizer(organizer)) {
 197                                 strcpy(organizer_string,
 198                                         icalproperty_get_organizer(organizer) );
 199                         }
 200                 }
 201                 if (!strncasecmp(organizer, "MAILTO:", 7)) {
 202                         strcpy(organizer_string, &organizer_string[7]);
 203                         striplt(organizer_string);
 204                 } else {
 205                         strcpy(organizer_string, "");
 206                 }
 207         }
 208
 209         /* Now generate the reply message and send it out. */
 210         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 211         icalcomponent_free(the_reply);  /* don't need this anymore */
 212         if (serialized_reply == NULL) return;
 213
 214         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 215         if (reply_message_text != NULL) {
 216                 sprintf(reply_message_text,
 217                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 218                         serialized_reply
 219                 );
 220
 221                 /* FIXME this still causes crashy crashy badness.  */
 222                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 223                         CC->quickroom.QRname, 0, FMT_RFC822,
 224                         NULL, "FIXME subject", reply_message_text);
 225
 226                 if (msg != NULL) {
 227                         valid = validate_recipients(organizer_string);
 228                         CtdlSubmitMsg(msg, valid, "");
 229                         CtdlFreeMessage(msg);
 230                 }
 231         }
 232         phree(serialized_reply);
 233 }
 234
 235
 236
 237 /*
 238  * Callback function for mime parser that hunts for calendar content types
 239  * and turns them into calendar objects
 240  */
 241 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 242                 void *content, char *cbtype, size_t length, char *encoding,
 243                 void *cbuserdata) {
 244
 245         struct ical_respond_data *ird = NULL;
 246
 247         ird = (struct ical_respond_data *) cbuserdata;
 248         if (ird->cal != NULL) {
 249                 icalcomponent_free(ird->cal);
 250                 ird->cal = NULL;
 251         }
 252         if (strcasecmp(partnum, ird->desired_partnum)) return;
 253         ird->cal = icalcomponent_new_from_string(content);
 254 }
 255
 256
 257 /*
 258  * Respond to a meeting request.
 259  */
 260 void ical_respond(long msgnum, char *partnum, char *action) {
 261         struct CtdlMessage *msg;
 262         struct ical_respond_data ird;
 263
 264         if (
 265            (strcasecmp(action, "accept"))
 266            && (strcasecmp(action, "decline"))
 267         ) {
 268                 cprintf("%d Action must be 'accept' or 'decline'\n",
 269                         ERROR + ILLEGAL_VALUE
 270                 );
 271                 return;
 272         }
 273
 274         msg = CtdlFetchMessage(msgnum);
 275         if (msg == NULL) {
 276                 cprintf("%d Message %ld not found.\n",
 277                         ERROR+ILLEGAL_VALUE,
 278                         (long)msgnum
 279                 );
 280                 return;
 281         }
 282
 283         memset(&ird, 0, sizeof ird);
 284         strcpy(ird.desired_partnum, partnum);
 285         mime_parser(msg->cm_fields['M'],
 286                 NULL,
 287                 *ical_locate_part,              /* callback function */
 288                 NULL, NULL,
 289                 (void *) &ird,                  /* user data */
 290                 0
 291         );
 292
 293         /* We're done with the incoming message, because we now have a
 294          * calendar object in memory.
 295          */
 296         CtdlFreeMessage(msg);
 297
 298         /*
 299          * Here is the real meat of this function.  Handle the event.
 300          */
 301         if (ird.cal != NULL) {
 302                 /* Save this in the user's calendar if necessary */
 303                 if (!strcasecmp(action, "accept")) {
 304                         ical_add(ird.cal, 0);
 305                 }
 306
 307                 /* Send a reply if necessary */
 308                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 309                         ical_send_a_reply(ird.cal, action);
 310                 }
 311
 312                 /* Delete the message from the inbox */
 313                 /* FIXME ... do this */
 314
 315                 /* Free the memory we allocated and return a response. */
 316                 icalcomponent_free(ird.cal);
 317                 ird.cal = NULL;
 318                 cprintf("%d ok\n", CIT_OK);
 319                 return;
 320         }
 321         else {
 322                 cprintf("%d No calendar object found\n", ERROR);
 323                 return;
 324         }
 325
 326         /* should never get here */
 327 }
 328
 329
 330 /*
 331  * Search for a property in both the top level and in a VEVENT subcomponent
 332  */
 333 icalproperty *ical_ctdl_get_subprop(
 334                 icalcomponent *cal,
 335                 icalproperty_kind which_prop
 336 ) {
 337         icalproperty *p;
 338         icalcomponent *c;
 339
 340         p = icalcomponent_get_first_property(cal, which_prop);
 341         if (p == NULL) {
 342                 c = icalcomponent_get_first_component(cal,
 343                                                         ICAL_VEVENT_COMPONENT);
 344                 if (c != NULL) {
 345                         p = icalcomponent_get_first_property(c, which_prop);
 346                 }
 347         }
 348         return p;
 349 }
 350
 351
 352 /*
 353  * Check to see if two events overlap.  Returns nonzero if they do.
 354  */
 355 int ical_ctdl_is_overlap(
 356                         struct icaltimetype t1start,
 357                         struct icaltimetype t1end,
 358                         struct icaltimetype t2start,
 359                         struct icaltimetype t2end
 360 ) {
 361
 362         if (icaltime_is_null_time(t1start)) return(0);
 363         if (icaltime_is_null_time(t2start)) return(0);
 364
 365         /* First, check for all-day events */
 366         if (t1start.is_date) {
 367                 if (!icaltime_compare_date_only(t1start, t2start)) {
 368                         return(1);
 369                 }
 370                 if (!icaltime_is_null_time(t2end)) {
 371                         if (!icaltime_compare_date_only(t1start, t2end)) {
 372                                 return(1);
 373                         }
 374                 }
 375         }
 376
 377         if (t2start.is_date) {
 378                 if (!icaltime_compare_date_only(t2start, t1start)) {
 379                         return(1);
 380                 }
 381                 if (!icaltime_is_null_time(t1end)) {
 382                         if (!icaltime_compare_date_only(t2start, t1end)) {
 383                                 return(1);
 384                         }
 385                 }
 386         }
 387
 388         /* Now check for overlaps using date *and* time. */
 389
 390         /* First, bail out if either event 1 or event 2 is missing end time. */
 391         if (icaltime_is_null_time(t1end)) return(0);
 392         if (icaltime_is_null_time(t2end)) return(0);
 393
 394         /* If event 1 ends before event 2 starts, we're in the clear. */
 395         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 396
 397         /* If event 2 ends before event 1 starts, we're also ok. */
 398         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 399
 400         /* Otherwise, they overlap. */
 401         return(1);
 402 }
 403
 404
 405
 406 /*
 407  * Backend for ical_hunt_for_conflicts()
 408  */
 409 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 410         icalcomponent *cal;
 411         struct CtdlMessage *msg;
 412         struct ical_respond_data ird;
 413         struct icaltimetype t1start, t1end, t2start, t2end;
 414         icalproperty *p;
 415         char conflict_event_uid[SIZ];
 416         char conflict_event_summary[SIZ];
 417         char compare_uid[SIZ];
 418
 419         cal = (icalcomponent *)data;
 420         strcpy(compare_uid, "");
 421         strcpy(conflict_event_uid, "");
 422         strcpy(conflict_event_summary, "");
 423
 424         msg = CtdlFetchMessage(msgnum);
 425         if (msg == NULL) return;
 426         memset(&ird, 0, sizeof ird);
 427         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 428         mime_parser(msg->cm_fields['M'],
 429                 NULL,
 430                 *ical_locate_part,              /* callback function */
 431                 NULL, NULL,
 432                 (void *) &ird,                  /* user data */
 433                 0
 434         );
 435         CtdlFreeMessage(msg);
 436
 437         if (ird.cal == NULL) return;
 438
 439         t1start = icaltime_null_time();
 440         t1end = icaltime_null_time();
 441         t2start = icaltime_null_time();
 442         t1end = icaltime_null_time();
 443
 444         /* Now compare cal to ird.cal */
 445         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 446         if (p == NULL) return;
 447         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 448
 449         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 450         if (p != NULL) t2end = icalproperty_get_dtend(p);
 451
 452         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 453         if (p == NULL) return;
 454         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 455
 456         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 457         if (p != NULL) t1end = icalproperty_get_dtend(p);
 458
 459         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 460         if (p != NULL) {
 461                 strcpy(compare_uid, icalproperty_get_comment(p));
 462         }
 463
 464         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 465         if (p != NULL) {
 466                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 467         }
 468
 469         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 470         if (p != NULL) {
 471                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 472         }
 473
 474
 475         icalcomponent_free(ird.cal);
 476
 477         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 478                 cprintf("%ld||%s|%s|%d|\n",
 479                         msgnum,
 480                         conflict_event_uid,
 481                         conflict_event_summary,
 482                         (       ((strlen(compare_uid)>0)
 483                                 &&(!strcasecmp(compare_uid,
 484                                 conflict_event_uid))) ? 1 : 0
 485                         )
 486                 );
 487         }
 488 }
 489
 490
 491
 492 /*
 493  * Phase 2 of "hunt for conflicts" operation.
 494  * At this point we have a calendar object which represents the VEVENT that
 495  * we're considering adding to the calendar.  Now hunt through the user's
 496  * calendar room, and output zero or more existing VEVENTs which conflict
 497  * with this one.
 498  */
 499 void ical_hunt_for_conflicts(icalcomponent *cal) {
 500         char hold_rm[ROOMNAMELEN];
 501
 502         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 503
 504         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 505                 getroom(&CC->quickroom, hold_rm);
 506                 cprintf("%d You do not have a calendar.\n", ERROR);
 507                 return;
 508         }
 509
 510         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 511
 512         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 513                 NULL,
 514                 ical_hunt_for_conflicts_backend,
 515                 (void *) cal
 516         );
 517
 518         cprintf("000\n");
 519         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 520
 521 }
 522
 523
 524
 525 /*
 526  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 527  */
 528 void ical_conflicts(long msgnum, char *partnum) {
 529         struct CtdlMessage *msg;
 530         struct ical_respond_data ird;
 531
 532         msg = CtdlFetchMessage(msgnum);
 533         if (msg == NULL) {
 534                 cprintf("%d Message %ld not found.\n",
 535                         ERROR+ILLEGAL_VALUE,
 536                         (long)msgnum
 537                 );
 538                 return;
 539         }
 540
 541         memset(&ird, 0, sizeof ird);
 542         strcpy(ird.desired_partnum, partnum);
 543         mime_parser(msg->cm_fields['M'],
 544                 NULL,
 545                 *ical_locate_part,              /* callback function */
 546                 NULL, NULL,
 547                 (void *) &ird,                  /* user data */
 548                 0
 549         );
 550
 551         CtdlFreeMessage(msg);
 552
 553         if (ird.cal != NULL) {
 554                 ical_hunt_for_conflicts(ird.cal);
 555                 icalcomponent_free(ird.cal);
 556                 return;
 557         }
 558         else {
 559                 cprintf("%d No calendar object found\n", ERROR);
 560                 return;
 561         }
 562
 563         /* should never get here */
 564 }
 565
 566
 567
 568
 569 /*
 570  * All Citadel calendar commands from the client come through here.
 571  */
 572 void cmd_ical(char *argbuf)
 573 {
 574         char subcmd[SIZ];
 575         long msgnum;
 576         char partnum[SIZ];
 577         char action[SIZ];
 578
 579         if (CtdlAccessCheck(ac_logged_in)) return;
 580
 581         extract(subcmd, argbuf, 0);
 582
 583         if (!strcmp(subcmd, "test")) {
 584                 cprintf("%d This server supports calendaring\n", CIT_OK);
 585                 return;
 586         }
 587
 588         else if (!strcmp(subcmd, "respond")) {
 589                 msgnum = extract_long(argbuf, 1);
 590                 extract(partnum, argbuf, 2);
 591                 extract(action, argbuf, 3);
 592                 ical_respond(msgnum, partnum, action);
 593         }
 594
 595         else if (!strcmp(subcmd, "conflicts")) {
 596                 msgnum = extract_long(argbuf, 1);
 597                 extract(partnum, argbuf, 2);
 598                 ical_conflicts(msgnum, partnum);
 599         }
 600
 601         else {
 602                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 603                 return;
 604         }
 605
 606         /* should never get here */
 607 }
 608
 609
 610
 611 /*
 612  * We don't know if the calendar room exists so we just create it at login
 613  */
 614 void ical_create_room(void)
 615 {
 616         struct quickroom qr;
 617         struct visit vbuf;
 618
 619         /* Create the calendar room if it doesn't already exist */
 620         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
 621
 622         /* Set expiration policy to manual; otherwise objects will be lost! */
 623         if (lgetroom(&qr, USERCALENDARROOM)) {
 624                 lprintf(3, "Couldn't get the user calendar room!\n");
 625                 return;
 626         }
 627         qr.QRep.expire_mode = EXPIRE_MANUAL;
 628         lputroom(&qr);
 629
 630         /* Set the view to a calendar view */
 631         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 632         vbuf.v_view = 3;        /* 3 = calendar */
 633         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 634
 635         /* Create the tasks list room if it doesn't already exist */
 636         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
 637
 638         /* Set expiration policy to manual; otherwise objects will be lost! */
 639         if (lgetroom(&qr, USERTASKSROOM)) {
 640                 lprintf(3, "Couldn't get the user calendar room!\n");
 641                 return;
 642         }
 643         qr.QRep.expire_mode = EXPIRE_MANUAL;
 644         lputroom(&qr);
 645
 646         /* Set the view to a task list view */
 647         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 648         vbuf.v_view = 4;        /* 4 = tasks */
 649         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 650
 651         return;
 652 }
 653
 654
 655
 656 /*
 657  * Back end for ical_obj_beforesave()
 658  * This hunts for the UID of the calendar event.
 659  */
 660 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
 661                 char *disp, void *content, char *cbtype, size_t length,
 662                 char *encoding, void *cbuserdata)
 663 {
 664         icalcomponent *cal;
 665         icalproperty *p;
 666
 667         /* If this is a text/calendar object, hunt for the UID and drop it in
 668          * the "user data" pointer for the MIME parser.  When
 669          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 670          * to that string.
 671          */
 672         if (!strcasecmp(cbtype, "text/calendar")) {
 673                 cal = icalcomponent_new_from_string(content);
 674                 if (cal != NULL) {
 675                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 676                         if (p != NULL) {
 677                                 strcpy((char *)cbuserdata,
 678                                         icalproperty_get_comment(p)
 679                                 );
 680                         }
 681                         icalcomponent_free(cal);
 682                 }
 683         }
 684 }
 685
 686
 687
 688
 689
 690 /*
 691  * See if we need to prevent the object from being saved (we don't allow
 692  * MIME types other than text/calendar in the Calendar> room).  Also, when
 693  * saving an event to the calendar, set the message's Citadel extended message
 694  * ID to the UID of the object.  This causes our replication checker to
 695  * automatically delete any existing instances of the same object.  (Isn't
 696  * that cool?)
 697  */
 698 int ical_obj_beforesave(struct CtdlMessage *msg)
 699 {
 700         char roomname[ROOMNAMELEN];
 701         char *p;
 702         int a;
 703         char eidbuf[SIZ];
 704
 705         /*
 706          * Only messages with content-type text/calendar
 707          * may be saved to Calendar>.  If the message is bound for
 708          * Calendar> but doesn't have this content-type, throw an error
 709          * so that the message may not be posted.
 710          */
 711
 712         /* First determine if this is our room */
 713         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 714         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 715                 return 0;       /* It's not the Calendar room. */
 716         }
 717
 718         /* Then determine content-type of the message */
 719
 720         /* It must be an RFC822 message! */
 721         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 722         if (msg->cm_format_type != 4)
 723                 return 1;       /* You tried to save a non-RFC822 message! */
 724
 725         /* Find the Content-Type: header */
 726         p = msg->cm_fields['M'];
 727         a = strlen(p);
 728         while (--a > 0) {
 729                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 730                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 731                                 strcpy(eidbuf, "");
 732                                 mime_parser(msg->cm_fields['M'],
 733                                         NULL,
 734                                         *ical_ctdl_set_extended_msgid,
 735                                         NULL, NULL,
 736                                         (void *)eidbuf,
 737                                         0
 738                                 );
 739                                 if (strlen(eidbuf) > 0) {
 740                                         if (msg->cm_fields['E'] != NULL) {
 741                                                 phree(msg->cm_fields['E']);
 742                                         }
 743                                         msg->cm_fields['E'] = strdoop(eidbuf);
 744                                 }
 745                                 return 0;
 746                         }
 747                         else {
 748                                 return 1;
 749                         }
 750                 }
 751                 p++;
 752         }
 753
 754         /* Oops!  No Content-Type in this message!  How'd that happen? */
 755         lprintf(7, "RFC822 message with no Content-Type header!\n");
 756         return 1;
 757 }
 758
 759
 760 #endif  /* HAVE_ICAL_H */
 761
 762 /*
 763  * Register this module with the Citadel server.
 764  */
 765 char *Dynamic_Module_Init(void)
 766 {
 767 #ifdef HAVE_ICAL_H
 768         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
 769         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
 770         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
 771 #endif
 772         return "$Id$";
 773 }