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 *summary = NULL;
 120         char summary_string[SIZ];
 121         icalproperty *me_attend = NULL;
 122         struct recptypes *recp = NULL;
 123         icalparameter *partstat = NULL;
 124         char *serialized_reply = NULL;
 125         char *reply_message_text = NULL;
 126         struct CtdlMessage *msg = NULL;
 127         struct recptypes *valid = NULL;
 128
 129         strcpy(organizer_string, "");
 130         strcpy(summary_string, "Calendar item");
 131
 132         if (request == NULL) {
 133                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 134                 return;
 135         }
 136
 137         the_reply = icalcomponent_new_clone(request);
 138         if (the_reply == NULL) {
 139                 lprintf(3, "ERROR: cannot clone request\n");
 140                 return;
 141         }
 142
 143         /* Change the method from REQUEST to REPLY */
 144         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 145
 146         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 147         if (vevent != NULL) {
 148                 /* Hunt for attendees, removing ones that aren't us.
 149                  * (Actually, remove them all, cloning our own one so we can
 150                  * re-insert it later)
 151                  */
 152                 while (attendee = icalcomponent_get_first_property(vevent,
 153                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 154                 ) {
 155                         if (icalproperty_get_attendee(attendee)) {
 156                                 strcpy(attendee_string,
 157                                         icalproperty_get_attendee(attendee) );
 158                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 159                                         strcpy(attendee_string, &attendee_string[7]);
 160                                         striplt(attendee_string);
 161                                         recp = validate_recipients(attendee_string);
 162                                         if (recp != NULL) {
 163                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 164                                                         if (me_attend) icalproperty_free(me_attend);
 165                                                         me_attend = icalproperty_new_clone(attendee);
 166                                                 }
 167                                                 phree(recp);
 168                                         }
 169                                 }
 170                         }
 171                         /* Remove it... */
 172                         icalcomponent_remove_property(vevent, attendee);
 173                 }
 174
 175                 /* We found our own address in the attendee list. */
 176                 if (me_attend) {
 177                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 178                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 179
 180                         if (!strcasecmp(action, "accept")) {
 181                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 182                         }
 183                         else if (!strcasecmp(action, "decline")) {
 184                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 185                         }
 186                         else if (!strcasecmp(action, "tentative")) {
 187                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 188                         }
 189
 190                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 191
 192                         /* Now insert it back into the vevent. */
 193                         icalcomponent_add_property(vevent, me_attend);
 194                 }
 195
 196                 /* Figure out who to send this thing to */
 197                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 198                 if (organizer != NULL) {
 199                         if (icalproperty_get_organizer(organizer)) {
 200                                 strcpy(organizer_string,
 201                                         icalproperty_get_organizer(organizer) );
 202                         }
 203                 }
 204                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 205                         strcpy(organizer_string, &organizer_string[7]);
 206                         striplt(organizer_string);
 207                 } else {
 208                         strcpy(organizer_string, "");
 209                 }
 210
 211                 /* Extract the summary string -- we'll use it as the
 212                  * message subject for the reply
 213                  */
 214                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 215                 if (summary != NULL) {
 216                         if (icalproperty_get_summary(summary)) {
 217                                 strcpy(summary_string,
 218                                         icalproperty_get_summary(summary) );
 219                         }
 220                 }
 221
 222         }
 223
 224         /* Now generate the reply message and send it out. */
 225         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 226         icalcomponent_free(the_reply);  /* don't need this anymore */
 227         if (serialized_reply == NULL) return;
 228
 229         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 230         if (reply_message_text != NULL) {
 231                 sprintf(reply_message_text,
 232                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 233                         serialized_reply
 234                 );
 235
 236                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 237                         CC->quickroom.QRname, 0, FMT_RFC822,
 238                         "",
 239                         summary_string,         /* Use summary for subject */
 240                         reply_message_text);
 241
 242                 if (msg != NULL) {
 243                         valid = validate_recipients(organizer_string);
 244                         CtdlSubmitMsg(msg, valid, "");
 245                         CtdlFreeMessage(msg);
 246                 }
 247         }
 248         phree(serialized_reply);
 249 }
 250
 251
 252
 253 /*
 254  * Callback function for mime parser that hunts for calendar content types
 255  * and turns them into calendar objects
 256  */
 257 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 258                 void *content, char *cbtype, size_t length, char *encoding,
 259                 void *cbuserdata) {
 260
 261         struct ical_respond_data *ird = NULL;
 262
 263         ird = (struct ical_respond_data *) cbuserdata;
 264         if (ird->cal != NULL) {
 265                 icalcomponent_free(ird->cal);
 266                 ird->cal = NULL;
 267         }
 268         if (strcasecmp(partnum, ird->desired_partnum)) return;
 269         ird->cal = icalcomponent_new_from_string(content);
 270 }
 271
 272
 273 /*
 274  * Respond to a meeting request.
 275  */
 276 void ical_respond(long msgnum, char *partnum, char *action) {
 277         struct CtdlMessage *msg;
 278         struct ical_respond_data ird;
 279
 280         if (
 281            (strcasecmp(action, "accept"))
 282            && (strcasecmp(action, "decline"))
 283         ) {
 284                 cprintf("%d Action must be 'accept' or 'decline'\n",
 285                         ERROR + ILLEGAL_VALUE
 286                 );
 287                 return;
 288         }
 289
 290         msg = CtdlFetchMessage(msgnum);
 291         if (msg == NULL) {
 292                 cprintf("%d Message %ld not found.\n",
 293                         ERROR+ILLEGAL_VALUE,
 294                         (long)msgnum
 295                 );
 296                 return;
 297         }
 298
 299         memset(&ird, 0, sizeof ird);
 300         strcpy(ird.desired_partnum, partnum);
 301         mime_parser(msg->cm_fields['M'],
 302                 NULL,
 303                 *ical_locate_part,              /* callback function */
 304                 NULL, NULL,
 305                 (void *) &ird,                  /* user data */
 306                 0
 307         );
 308
 309         /* We're done with the incoming message, because we now have a
 310          * calendar object in memory.
 311          */
 312         CtdlFreeMessage(msg);
 313
 314         /*
 315          * Here is the real meat of this function.  Handle the event.
 316          */
 317         if (ird.cal != NULL) {
 318                 /* Save this in the user's calendar if necessary */
 319                 if (!strcasecmp(action, "accept")) {
 320                         ical_add(ird.cal, 0);
 321                 }
 322
 323                 /* Send a reply if necessary */
 324                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 325                         ical_send_a_reply(ird.cal, action);
 326                 }
 327
 328                 /* Now that we've processed this message, we don't need it
 329                  * anymore.  So delete it.
 330                  */
 331                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 332
 333                 /* Free the memory we allocated and return a response. */
 334                 icalcomponent_free(ird.cal);
 335                 ird.cal = NULL;
 336                 cprintf("%d ok\n", CIT_OK);
 337                 return;
 338         }
 339         else {
 340                 cprintf("%d No calendar object found\n", ERROR);
 341                 return;
 342         }
 343
 344         /* should never get here */
 345 }
 346
 347
 348 /*
 349  * Search for a property in both the top level and in a VEVENT subcomponent
 350  */
 351 icalproperty *ical_ctdl_get_subprop(
 352                 icalcomponent *cal,
 353                 icalproperty_kind which_prop
 354 ) {
 355         icalproperty *p;
 356         icalcomponent *c;
 357
 358         p = icalcomponent_get_first_property(cal, which_prop);
 359         if (p == NULL) {
 360                 c = icalcomponent_get_first_component(cal,
 361                                                         ICAL_VEVENT_COMPONENT);
 362                 if (c != NULL) {
 363                         p = icalcomponent_get_first_property(c, which_prop);
 364                 }
 365         }
 366         return p;
 367 }
 368
 369
 370 /*
 371  * Check to see if two events overlap.  Returns nonzero if they do.
 372  */
 373 int ical_ctdl_is_overlap(
 374                         struct icaltimetype t1start,
 375                         struct icaltimetype t1end,
 376                         struct icaltimetype t2start,
 377                         struct icaltimetype t2end
 378 ) {
 379
 380         if (icaltime_is_null_time(t1start)) return(0);
 381         if (icaltime_is_null_time(t2start)) return(0);
 382
 383         /* First, check for all-day events */
 384         if (t1start.is_date) {
 385                 if (!icaltime_compare_date_only(t1start, t2start)) {
 386                         return(1);
 387                 }
 388                 if (!icaltime_is_null_time(t2end)) {
 389                         if (!icaltime_compare_date_only(t1start, t2end)) {
 390                                 return(1);
 391                         }
 392                 }
 393         }
 394
 395         if (t2start.is_date) {
 396                 if (!icaltime_compare_date_only(t2start, t1start)) {
 397                         return(1);
 398                 }
 399                 if (!icaltime_is_null_time(t1end)) {
 400                         if (!icaltime_compare_date_only(t2start, t1end)) {
 401                                 return(1);
 402                         }
 403                 }
 404         }
 405
 406         /* Now check for overlaps using date *and* time. */
 407
 408         /* First, bail out if either event 1 or event 2 is missing end time. */
 409         if (icaltime_is_null_time(t1end)) return(0);
 410         if (icaltime_is_null_time(t2end)) return(0);
 411
 412         /* If event 1 ends before event 2 starts, we're in the clear. */
 413         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 414
 415         /* If event 2 ends before event 1 starts, we're also ok. */
 416         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 417
 418         /* Otherwise, they overlap. */
 419         return(1);
 420 }
 421
 422
 423
 424 /*
 425  * Backend for ical_hunt_for_conflicts()
 426  */
 427 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 428         icalcomponent *cal;
 429         struct CtdlMessage *msg;
 430         struct ical_respond_data ird;
 431         struct icaltimetype t1start, t1end, t2start, t2end;
 432         icalproperty *p;
 433         char conflict_event_uid[SIZ];
 434         char conflict_event_summary[SIZ];
 435         char compare_uid[SIZ];
 436
 437         cal = (icalcomponent *)data;
 438         strcpy(compare_uid, "");
 439         strcpy(conflict_event_uid, "");
 440         strcpy(conflict_event_summary, "");
 441
 442         msg = CtdlFetchMessage(msgnum);
 443         if (msg == NULL) return;
 444         memset(&ird, 0, sizeof ird);
 445         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 446         mime_parser(msg->cm_fields['M'],
 447                 NULL,
 448                 *ical_locate_part,              /* callback function */
 449                 NULL, NULL,
 450                 (void *) &ird,                  /* user data */
 451                 0
 452         );
 453         CtdlFreeMessage(msg);
 454
 455         if (ird.cal == NULL) return;
 456
 457         t1start = icaltime_null_time();
 458         t1end = icaltime_null_time();
 459         t2start = icaltime_null_time();
 460         t1end = icaltime_null_time();
 461
 462         /* Now compare cal to ird.cal */
 463         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 464         if (p == NULL) return;
 465         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 466
 467         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 468         if (p != NULL) t2end = icalproperty_get_dtend(p);
 469
 470         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 471         if (p == NULL) return;
 472         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 473
 474         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 475         if (p != NULL) t1end = icalproperty_get_dtend(p);
 476
 477         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 478         if (p != NULL) {
 479                 strcpy(compare_uid, icalproperty_get_comment(p));
 480         }
 481
 482         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 483         if (p != NULL) {
 484                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 485         }
 486
 487         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 488         if (p != NULL) {
 489                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 490         }
 491
 492
 493         icalcomponent_free(ird.cal);
 494
 495         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 496                 cprintf("%ld||%s|%s|%d|\n",
 497                         msgnum,
 498                         conflict_event_uid,
 499                         conflict_event_summary,
 500                         (       ((strlen(compare_uid)>0)
 501                                 &&(!strcasecmp(compare_uid,
 502                                 conflict_event_uid))) ? 1 : 0
 503                         )
 504                 );
 505         }
 506 }
 507
 508
 509
 510 /*
 511  * Phase 2 of "hunt for conflicts" operation.
 512  * At this point we have a calendar object which represents the VEVENT that
 513  * we're considering adding to the calendar.  Now hunt through the user's
 514  * calendar room, and output zero or more existing VEVENTs which conflict
 515  * with this one.
 516  */
 517 void ical_hunt_for_conflicts(icalcomponent *cal) {
 518         char hold_rm[ROOMNAMELEN];
 519
 520         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 521
 522         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 523                 getroom(&CC->quickroom, hold_rm);
 524                 cprintf("%d You do not have a calendar.\n", ERROR);
 525                 return;
 526         }
 527
 528         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 529
 530         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 531                 NULL,
 532                 ical_hunt_for_conflicts_backend,
 533                 (void *) cal
 534         );
 535
 536         cprintf("000\n");
 537         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 538
 539 }
 540
 541
 542
 543 /*
 544  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 545  */
 546 void ical_conflicts(long msgnum, char *partnum) {
 547         struct CtdlMessage *msg;
 548         struct ical_respond_data ird;
 549
 550         msg = CtdlFetchMessage(msgnum);
 551         if (msg == NULL) {
 552                 cprintf("%d Message %ld not found.\n",
 553                         ERROR+ILLEGAL_VALUE,
 554                         (long)msgnum
 555                 );
 556                 return;
 557         }
 558
 559         memset(&ird, 0, sizeof ird);
 560         strcpy(ird.desired_partnum, partnum);
 561         mime_parser(msg->cm_fields['M'],
 562                 NULL,
 563                 *ical_locate_part,              /* callback function */
 564                 NULL, NULL,
 565                 (void *) &ird,                  /* user data */
 566                 0
 567         );
 568
 569         CtdlFreeMessage(msg);
 570
 571         if (ird.cal != NULL) {
 572                 ical_hunt_for_conflicts(ird.cal);
 573                 icalcomponent_free(ird.cal);
 574                 return;
 575         }
 576         else {
 577                 cprintf("%d No calendar object found\n", ERROR);
 578                 return;
 579         }
 580
 581         /* should never get here */
 582 }
 583
 584
 585
 586
 587 /*
 588  * All Citadel calendar commands from the client come through here.
 589  */
 590 void cmd_ical(char *argbuf)
 591 {
 592         char subcmd[SIZ];
 593         long msgnum;
 594         char partnum[SIZ];
 595         char action[SIZ];
 596
 597         if (CtdlAccessCheck(ac_logged_in)) return;
 598
 599         extract(subcmd, argbuf, 0);
 600
 601         if (!strcmp(subcmd, "test")) {
 602                 cprintf("%d This server supports calendaring\n", CIT_OK);
 603                 return;
 604         }
 605
 606         else if (!strcmp(subcmd, "respond")) {
 607                 msgnum = extract_long(argbuf, 1);
 608                 extract(partnum, argbuf, 2);
 609                 extract(action, argbuf, 3);
 610                 ical_respond(msgnum, partnum, action);
 611         }
 612
 613         else if (!strcmp(subcmd, "conflicts")) {
 614                 msgnum = extract_long(argbuf, 1);
 615                 extract(partnum, argbuf, 2);
 616                 ical_conflicts(msgnum, partnum);
 617         }
 618
 619         else {
 620                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 621                 return;
 622         }
 623
 624         /* should never get here */
 625 }
 626
 627
 628
 629 /*
 630  * We don't know if the calendar room exists so we just create it at login
 631  */
 632 void ical_create_room(void)
 633 {
 634         struct quickroom qr;
 635         struct visit vbuf;
 636
 637         /* Create the calendar room if it doesn't already exist */
 638         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
 639
 640         /* Set expiration policy to manual; otherwise objects will be lost! */
 641         if (lgetroom(&qr, USERCALENDARROOM)) {
 642                 lprintf(3, "Couldn't get the user calendar room!\n");
 643                 return;
 644         }
 645         qr.QRep.expire_mode = EXPIRE_MANUAL;
 646         lputroom(&qr);
 647
 648         /* Set the view to a calendar view */
 649         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 650         vbuf.v_view = 3;        /* 3 = calendar */
 651         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 652
 653         /* Create the tasks list room if it doesn't already exist */
 654         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
 655
 656         /* Set expiration policy to manual; otherwise objects will be lost! */
 657         if (lgetroom(&qr, USERTASKSROOM)) {
 658                 lprintf(3, "Couldn't get the user calendar room!\n");
 659                 return;
 660         }
 661         qr.QRep.expire_mode = EXPIRE_MANUAL;
 662         lputroom(&qr);
 663
 664         /* Set the view to a task list view */
 665         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 666         vbuf.v_view = 4;        /* 4 = tasks */
 667         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 668
 669         return;
 670 }
 671
 672
 673
 674 /*
 675  * Back end for ical_obj_beforesave()
 676  * This hunts for the UID of the calendar event.
 677  */
 678 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
 679                 char *disp, void *content, char *cbtype, size_t length,
 680                 char *encoding, void *cbuserdata)
 681 {
 682         icalcomponent *cal;
 683         icalproperty *p;
 684
 685         /* If this is a text/calendar object, hunt for the UID and drop it in
 686          * the "user data" pointer for the MIME parser.  When
 687          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 688          * to that string.
 689          */
 690         if (!strcasecmp(cbtype, "text/calendar")) {
 691                 cal = icalcomponent_new_from_string(content);
 692                 if (cal != NULL) {
 693                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 694                         if (p != NULL) {
 695                                 strcpy((char *)cbuserdata,
 696                                         icalproperty_get_comment(p)
 697                                 );
 698                         }
 699                         icalcomponent_free(cal);
 700                 }
 701         }
 702 }
 703
 704
 705
 706
 707
 708 /*
 709  * See if we need to prevent the object from being saved (we don't allow
 710  * MIME types other than text/calendar in the Calendar> room).  Also, when
 711  * saving an event to the calendar, set the message's Citadel extended message
 712  * ID to the UID of the object.  This causes our replication checker to
 713  * automatically delete any existing instances of the same object.  (Isn't
 714  * that cool?)
 715  */
 716 int ical_obj_beforesave(struct CtdlMessage *msg)
 717 {
 718         char roomname[ROOMNAMELEN];
 719         char *p;
 720         int a;
 721         char eidbuf[SIZ];
 722
 723         /*
 724          * Only messages with content-type text/calendar
 725          * may be saved to Calendar>.  If the message is bound for
 726          * Calendar> but doesn't have this content-type, throw an error
 727          * so that the message may not be posted.
 728          */
 729
 730         /* First determine if this is our room */
 731         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 732         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 733                 return 0;       /* It's not the Calendar room. */
 734         }
 735
 736         /* Then determine content-type of the message */
 737
 738         /* It must be an RFC822 message! */
 739         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 740         if (msg->cm_format_type != 4)
 741                 return 1;       /* You tried to save a non-RFC822 message! */
 742
 743         /* Find the Content-Type: header */
 744         p = msg->cm_fields['M'];
 745         a = strlen(p);
 746         while (--a > 0) {
 747                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 748                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 749                                 strcpy(eidbuf, "");
 750                                 mime_parser(msg->cm_fields['M'],
 751                                         NULL,
 752                                         *ical_ctdl_set_extended_msgid,
 753                                         NULL, NULL,
 754                                         (void *)eidbuf,
 755                                         0
 756                                 );
 757                                 if (strlen(eidbuf) > 0) {
 758                                         if (msg->cm_fields['E'] != NULL) {
 759                                                 phree(msg->cm_fields['E']);
 760                                         }
 761                                         msg->cm_fields['E'] = strdoop(eidbuf);
 762                                 }
 763                                 return 0;
 764                         }
 765                         else {
 766                                 return 1;
 767                         }
 768                 }
 769                 p++;
 770         }
 771
 772         /* Oops!  No Content-Type in this message!  How'd that happen? */
 773         lprintf(7, "RFC822 message with no Content-Type header!\n");
 774         return 1;
 775 }
 776
 777
 778 #endif  /* HAVE_ICAL_H */
 779
 780 /*
 781  * Register this module with the Citadel server.
 782  */
 783 char *Dynamic_Module_Init(void)
 784 {
 785 #ifdef HAVE_ICAL_H
 786         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
 787         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
 788         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
 789 #endif
 790         return "$Id$";
 791 }