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_string, "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                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 222                         CC->quickroom.QRname, 0, FMT_RFC822,
 223                         "", "FIXME subject", reply_message_text);
 224
 225                 if (msg != NULL) {
 226                         valid = validate_recipients(organizer_string);
 227                         CtdlSubmitMsg(msg, valid, "");
 228                         CtdlFreeMessage(msg);
 229                 }
 230         }
 231         phree(serialized_reply);
 232 }
 233
 234
 235
 236 /*
 237  * Callback function for mime parser that hunts for calendar content types
 238  * and turns them into calendar objects
 239  */
 240 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 241                 void *content, char *cbtype, size_t length, char *encoding,
 242                 void *cbuserdata) {
 243
 244         struct ical_respond_data *ird = NULL;
 245
 246         ird = (struct ical_respond_data *) cbuserdata;
 247         if (ird->cal != NULL) {
 248                 icalcomponent_free(ird->cal);
 249                 ird->cal = NULL;
 250         }
 251         if (strcasecmp(partnum, ird->desired_partnum)) return;
 252         ird->cal = icalcomponent_new_from_string(content);
 253 }
 254
 255
 256 /*
 257  * Respond to a meeting request.
 258  */
 259 void ical_respond(long msgnum, char *partnum, char *action) {
 260         struct CtdlMessage *msg;
 261         struct ical_respond_data ird;
 262
 263         if (
 264            (strcasecmp(action, "accept"))
 265            && (strcasecmp(action, "decline"))
 266         ) {
 267                 cprintf("%d Action must be 'accept' or 'decline'\n",
 268                         ERROR + ILLEGAL_VALUE
 269                 );
 270                 return;
 271         }
 272
 273         msg = CtdlFetchMessage(msgnum);
 274         if (msg == NULL) {
 275                 cprintf("%d Message %ld not found.\n",
 276                         ERROR+ILLEGAL_VALUE,
 277                         (long)msgnum
 278                 );
 279                 return;
 280         }
 281
 282         memset(&ird, 0, sizeof ird);
 283         strcpy(ird.desired_partnum, partnum);
 284         mime_parser(msg->cm_fields['M'],
 285                 NULL,
 286                 *ical_locate_part,              /* callback function */
 287                 NULL, NULL,
 288                 (void *) &ird,                  /* user data */
 289                 0
 290         );
 291
 292         /* We're done with the incoming message, because we now have a
 293          * calendar object in memory.
 294          */
 295         CtdlFreeMessage(msg);
 296
 297         /*
 298          * Here is the real meat of this function.  Handle the event.
 299          */
 300         if (ird.cal != NULL) {
 301                 /* Save this in the user's calendar if necessary */
 302                 if (!strcasecmp(action, "accept")) {
 303                         ical_add(ird.cal, 0);
 304                 }
 305
 306                 /* Send a reply if necessary */
 307                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 308                         ical_send_a_reply(ird.cal, action);
 309                 }
 310
 311                 /* Now that we've processed this message, we don't need it
 312                  * anymore.  So delete it.
 313                  */
 314                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 315
 316                 /* Free the memory we allocated and return a response. */
 317                 icalcomponent_free(ird.cal);
 318                 ird.cal = NULL;
 319                 cprintf("%d ok\n", CIT_OK);
 320                 return;
 321         }
 322         else {
 323                 cprintf("%d No calendar object found\n", ERROR);
 324                 return;
 325         }
 326
 327         /* should never get here */
 328 }
 329
 330
 331 /*
 332  * Search for a property in both the top level and in a VEVENT subcomponent
 333  */
 334 icalproperty *ical_ctdl_get_subprop(
 335                 icalcomponent *cal,
 336                 icalproperty_kind which_prop
 337 ) {
 338         icalproperty *p;
 339         icalcomponent *c;
 340
 341         p = icalcomponent_get_first_property(cal, which_prop);
 342         if (p == NULL) {
 343                 c = icalcomponent_get_first_component(cal,
 344                                                         ICAL_VEVENT_COMPONENT);
 345                 if (c != NULL) {
 346                         p = icalcomponent_get_first_property(c, which_prop);
 347                 }
 348         }
 349         return p;
 350 }
 351
 352
 353 /*
 354  * Check to see if two events overlap.  Returns nonzero if they do.
 355  */
 356 int ical_ctdl_is_overlap(
 357                         struct icaltimetype t1start,
 358                         struct icaltimetype t1end,
 359                         struct icaltimetype t2start,
 360                         struct icaltimetype t2end
 361 ) {
 362
 363         if (icaltime_is_null_time(t1start)) return(0);
 364         if (icaltime_is_null_time(t2start)) return(0);
 365
 366         /* First, check for all-day events */
 367         if (t1start.is_date) {
 368                 if (!icaltime_compare_date_only(t1start, t2start)) {
 369                         return(1);
 370                 }
 371                 if (!icaltime_is_null_time(t2end)) {
 372                         if (!icaltime_compare_date_only(t1start, t2end)) {
 373                                 return(1);
 374                         }
 375                 }
 376         }
 377
 378         if (t2start.is_date) {
 379                 if (!icaltime_compare_date_only(t2start, t1start)) {
 380                         return(1);
 381                 }
 382                 if (!icaltime_is_null_time(t1end)) {
 383                         if (!icaltime_compare_date_only(t2start, t1end)) {
 384                                 return(1);
 385                         }
 386                 }
 387         }
 388
 389         /* Now check for overlaps using date *and* time. */
 390
 391         /* First, bail out if either event 1 or event 2 is missing end time. */
 392         if (icaltime_is_null_time(t1end)) return(0);
 393         if (icaltime_is_null_time(t2end)) return(0);
 394
 395         /* If event 1 ends before event 2 starts, we're in the clear. */
 396         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 397
 398         /* If event 2 ends before event 1 starts, we're also ok. */
 399         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 400
 401         /* Otherwise, they overlap. */
 402         return(1);
 403 }
 404
 405
 406
 407 /*
 408  * Backend for ical_hunt_for_conflicts()
 409  */
 410 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 411         icalcomponent *cal;
 412         struct CtdlMessage *msg;
 413         struct ical_respond_data ird;
 414         struct icaltimetype t1start, t1end, t2start, t2end;
 415         icalproperty *p;
 416         char conflict_event_uid[SIZ];
 417         char conflict_event_summary[SIZ];
 418         char compare_uid[SIZ];
 419
 420         cal = (icalcomponent *)data;
 421         strcpy(compare_uid, "");
 422         strcpy(conflict_event_uid, "");
 423         strcpy(conflict_event_summary, "");
 424
 425         msg = CtdlFetchMessage(msgnum);
 426         if (msg == NULL) return;
 427         memset(&ird, 0, sizeof ird);
 428         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 429         mime_parser(msg->cm_fields['M'],
 430                 NULL,
 431                 *ical_locate_part,              /* callback function */
 432                 NULL, NULL,
 433                 (void *) &ird,                  /* user data */
 434                 0
 435         );
 436         CtdlFreeMessage(msg);
 437
 438         if (ird.cal == NULL) return;
 439
 440         t1start = icaltime_null_time();
 441         t1end = icaltime_null_time();
 442         t2start = icaltime_null_time();
 443         t1end = icaltime_null_time();
 444
 445         /* Now compare cal to ird.cal */
 446         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 447         if (p == NULL) return;
 448         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 449
 450         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 451         if (p != NULL) t2end = icalproperty_get_dtend(p);
 452
 453         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 454         if (p == NULL) return;
 455         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 456
 457         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 458         if (p != NULL) t1end = icalproperty_get_dtend(p);
 459
 460         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 461         if (p != NULL) {
 462                 strcpy(compare_uid, icalproperty_get_comment(p));
 463         }
 464
 465         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 466         if (p != NULL) {
 467                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 468         }
 469
 470         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 471         if (p != NULL) {
 472                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 473         }
 474
 475
 476         icalcomponent_free(ird.cal);
 477
 478         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 479                 cprintf("%ld||%s|%s|%d|\n",
 480                         msgnum,
 481                         conflict_event_uid,
 482                         conflict_event_summary,
 483                         (       ((strlen(compare_uid)>0)
 484                                 &&(!strcasecmp(compare_uid,
 485                                 conflict_event_uid))) ? 1 : 0
 486                         )
 487                 );
 488         }
 489 }
 490
 491
 492
 493 /*
 494  * Phase 2 of "hunt for conflicts" operation.
 495  * At this point we have a calendar object which represents the VEVENT that
 496  * we're considering adding to the calendar.  Now hunt through the user's
 497  * calendar room, and output zero or more existing VEVENTs which conflict
 498  * with this one.
 499  */
 500 void ical_hunt_for_conflicts(icalcomponent *cal) {
 501         char hold_rm[ROOMNAMELEN];
 502
 503         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 504
 505         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 506                 getroom(&CC->quickroom, hold_rm);
 507                 cprintf("%d You do not have a calendar.\n", ERROR);
 508                 return;
 509         }
 510
 511         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 512
 513         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 514                 NULL,
 515                 ical_hunt_for_conflicts_backend,
 516                 (void *) cal
 517         );
 518
 519         cprintf("000\n");
 520         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 521
 522 }
 523
 524
 525
 526 /*
 527  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 528  */
 529 void ical_conflicts(long msgnum, char *partnum) {
 530         struct CtdlMessage *msg;
 531         struct ical_respond_data ird;
 532
 533         msg = CtdlFetchMessage(msgnum);
 534         if (msg == NULL) {
 535                 cprintf("%d Message %ld not found.\n",
 536                         ERROR+ILLEGAL_VALUE,
 537                         (long)msgnum
 538                 );
 539                 return;
 540         }
 541
 542         memset(&ird, 0, sizeof ird);
 543         strcpy(ird.desired_partnum, partnum);
 544         mime_parser(msg->cm_fields['M'],
 545                 NULL,
 546                 *ical_locate_part,              /* callback function */
 547                 NULL, NULL,
 548                 (void *) &ird,                  /* user data */
 549                 0
 550         );
 551
 552         CtdlFreeMessage(msg);
 553
 554         if (ird.cal != NULL) {
 555                 ical_hunt_for_conflicts(ird.cal);
 556                 icalcomponent_free(ird.cal);
 557                 return;
 558         }
 559         else {
 560                 cprintf("%d No calendar object found\n", ERROR);
 561                 return;
 562         }
 563
 564         /* should never get here */
 565 }
 566
 567
 568
 569
 570 /*
 571  * All Citadel calendar commands from the client come through here.
 572  */
 573 void cmd_ical(char *argbuf)
 574 {
 575         char subcmd[SIZ];
 576         long msgnum;
 577         char partnum[SIZ];
 578         char action[SIZ];
 579
 580         if (CtdlAccessCheck(ac_logged_in)) return;
 581
 582         extract(subcmd, argbuf, 0);
 583
 584         if (!strcmp(subcmd, "test")) {
 585                 cprintf("%d This server supports calendaring\n", CIT_OK);
 586                 return;
 587         }
 588
 589         else if (!strcmp(subcmd, "respond")) {
 590                 msgnum = extract_long(argbuf, 1);
 591                 extract(partnum, argbuf, 2);
 592                 extract(action, argbuf, 3);
 593                 ical_respond(msgnum, partnum, action);
 594         }
 595
 596         else if (!strcmp(subcmd, "conflicts")) {
 597                 msgnum = extract_long(argbuf, 1);
 598                 extract(partnum, argbuf, 2);
 599                 ical_conflicts(msgnum, partnum);
 600         }
 601
 602         else {
 603                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 604                 return;
 605         }
 606
 607         /* should never get here */
 608 }
 609
 610
 611
 612 /*
 613  * We don't know if the calendar room exists so we just create it at login
 614  */
 615 void ical_create_room(void)
 616 {
 617         struct quickroom qr;
 618         struct visit vbuf;
 619
 620         /* Create the calendar room if it doesn't already exist */
 621         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
 622
 623         /* Set expiration policy to manual; otherwise objects will be lost! */
 624         if (lgetroom(&qr, USERCALENDARROOM)) {
 625                 lprintf(3, "Couldn't get the user calendar room!\n");
 626                 return;
 627         }
 628         qr.QRep.expire_mode = EXPIRE_MANUAL;
 629         lputroom(&qr);
 630
 631         /* Set the view to a calendar view */
 632         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 633         vbuf.v_view = 3;        /* 3 = calendar */
 634         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 635
 636         /* Create the tasks list room if it doesn't already exist */
 637         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
 638
 639         /* Set expiration policy to manual; otherwise objects will be lost! */
 640         if (lgetroom(&qr, USERTASKSROOM)) {
 641                 lprintf(3, "Couldn't get the user calendar room!\n");
 642                 return;
 643         }
 644         qr.QRep.expire_mode = EXPIRE_MANUAL;
 645         lputroom(&qr);
 646
 647         /* Set the view to a task list view */
 648         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 649         vbuf.v_view = 4;        /* 4 = tasks */
 650         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 651
 652         return;
 653 }
 654
 655
 656
 657 /*
 658  * Back end for ical_obj_beforesave()
 659  * This hunts for the UID of the calendar event.
 660  */
 661 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
 662                 char *disp, void *content, char *cbtype, size_t length,
 663                 char *encoding, void *cbuserdata)
 664 {
 665         icalcomponent *cal;
 666         icalproperty *p;
 667
 668         /* If this is a text/calendar object, hunt for the UID and drop it in
 669          * the "user data" pointer for the MIME parser.  When
 670          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 671          * to that string.
 672          */
 673         if (!strcasecmp(cbtype, "text/calendar")) {
 674                 cal = icalcomponent_new_from_string(content);
 675                 if (cal != NULL) {
 676                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 677                         if (p != NULL) {
 678                                 strcpy((char *)cbuserdata,
 679                                         icalproperty_get_comment(p)
 680                                 );
 681                         }
 682                         icalcomponent_free(cal);
 683                 }
 684         }
 685 }
 686
 687
 688
 689
 690
 691 /*
 692  * See if we need to prevent the object from being saved (we don't allow
 693  * MIME types other than text/calendar in the Calendar> room).  Also, when
 694  * saving an event to the calendar, set the message's Citadel extended message
 695  * ID to the UID of the object.  This causes our replication checker to
 696  * automatically delete any existing instances of the same object.  (Isn't
 697  * that cool?)
 698  */
 699 int ical_obj_beforesave(struct CtdlMessage *msg)
 700 {
 701         char roomname[ROOMNAMELEN];
 702         char *p;
 703         int a;
 704         char eidbuf[SIZ];
 705
 706         /*
 707          * Only messages with content-type text/calendar
 708          * may be saved to Calendar>.  If the message is bound for
 709          * Calendar> but doesn't have this content-type, throw an error
 710          * so that the message may not be posted.
 711          */
 712
 713         /* First determine if this is our room */
 714         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 715         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 716                 return 0;       /* It's not the Calendar room. */
 717         }
 718
 719         /* Then determine content-type of the message */
 720
 721         /* It must be an RFC822 message! */
 722         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 723         if (msg->cm_format_type != 4)
 724                 return 1;       /* You tried to save a non-RFC822 message! */
 725
 726         /* Find the Content-Type: header */
 727         p = msg->cm_fields['M'];
 728         a = strlen(p);
 729         while (--a > 0) {
 730                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 731                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 732                                 strcpy(eidbuf, "");
 733                                 mime_parser(msg->cm_fields['M'],
 734                                         NULL,
 735                                         *ical_ctdl_set_extended_msgid,
 736                                         NULL, NULL,
 737                                         (void *)eidbuf,
 738                                         0
 739                                 );
 740                                 if (strlen(eidbuf) > 0) {
 741                                         if (msg->cm_fields['E'] != NULL) {
 742                                                 phree(msg->cm_fields['E']);
 743                                         }
 744                                         msg->cm_fields['E'] = strdoop(eidbuf);
 745                                 }
 746                                 return 0;
 747                         }
 748                         else {
 749                                 return 1;
 750                         }
 751                 }
 752                 p++;
 753         }
 754
 755         /* Oops!  No Content-Type in this message!  How'd that happen? */
 756         lprintf(7, "RFC822 message with no Content-Type header!\n");
 757         return 1;
 758 }
 759
 760
 761 #endif  /* HAVE_ICAL_H */
 762
 763 /*
 764  * Register this module with the Citadel server.
 765  */
 766 char *Dynamic_Module_Init(void)
 767 {
 768 #ifdef HAVE_ICAL_H
 769         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
 770         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
 771         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
 772 #endif
 773         return "$Id$";
 774 }