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