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  * Search for a property in both the top level and in a VEVENT subcomponent
 352  */
 353 icalproperty *ical_ctdl_get_subprop(
 354                 icalcomponent *cal,
 355                 icalproperty_kind which_prop
 356 ) {
 357         icalproperty *p;
 358         icalcomponent *c;
 359
 360         p = icalcomponent_get_first_property(cal, which_prop);
 361         if (p == NULL) {
 362                 c = icalcomponent_get_first_component(cal,
 363                                                         ICAL_VEVENT_COMPONENT);
 364                 if (c != NULL) {
 365                         p = icalcomponent_get_first_property(c, which_prop);
 366                 }
 367         }
 368         return p;
 369 }
 370
 371
 372 /*
 373  * Check to see if two events overlap.  Returns nonzero if they do.
 374  */
 375 int ical_ctdl_is_overlap(
 376                         struct icaltimetype t1start,
 377                         struct icaltimetype t1end,
 378                         struct icaltimetype t2start,
 379                         struct icaltimetype t2end
 380 ) {
 381
 382         if (icaltime_is_null_time(t1start)) return(0);
 383         if (icaltime_is_null_time(t2start)) return(0);
 384
 385         /* First, check for all-day events */
 386         if (t1start.is_date) {
 387                 if (!icaltime_compare_date_only(t1start, t2start)) {
 388                         return(1);
 389                 }
 390                 if (!icaltime_is_null_time(t2end)) {
 391                         if (!icaltime_compare_date_only(t1start, t2end)) {
 392                                 return(1);
 393                         }
 394                 }
 395         }
 396
 397         if (t2start.is_date) {
 398                 if (!icaltime_compare_date_only(t2start, t1start)) {
 399                         return(1);
 400                 }
 401                 if (!icaltime_is_null_time(t1end)) {
 402                         if (!icaltime_compare_date_only(t2start, t1end)) {
 403                                 return(1);
 404                         }
 405                 }
 406         }
 407
 408         /* Now check for overlaps using date *and* time. */
 409
 410         /* First, bail out if either event 1 or event 2 is missing end time. */
 411         if (icaltime_is_null_time(t1end)) return(0);
 412         if (icaltime_is_null_time(t2end)) return(0);
 413
 414         /* If event 1 ends before event 2 starts, we're in the clear. */
 415         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 416
 417         /* If event 2 ends before event 1 starts, we're also ok. */
 418         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 419
 420         /* Otherwise, they overlap. */
 421         return(1);
 422 }
 423
 424
 425
 426 /*
 427  * Backend for ical_hunt_for_conflicts()
 428  */
 429 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 430         icalcomponent *cal;
 431         struct CtdlMessage *msg;
 432         struct ical_respond_data ird;
 433         struct icaltimetype t1start, t1end, t2start, t2end;
 434         icalproperty *p;
 435         char conflict_event_uid[SIZ];
 436         char conflict_event_summary[SIZ];
 437         char compare_uid[SIZ];
 438
 439         cal = (icalcomponent *)data;
 440         strcpy(compare_uid, "");
 441         strcpy(conflict_event_uid, "");
 442         strcpy(conflict_event_summary, "");
 443
 444         msg = CtdlFetchMessage(msgnum);
 445         if (msg == NULL) return;
 446         memset(&ird, 0, sizeof ird);
 447         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 448         mime_parser(msg->cm_fields['M'],
 449                 NULL,
 450                 *ical_locate_part,              /* callback function */
 451                 NULL, NULL,
 452                 (void *) &ird,                  /* user data */
 453                 0
 454         );
 455         CtdlFreeMessage(msg);
 456
 457         if (ird.cal == NULL) return;
 458
 459         t1start = icaltime_null_time();
 460         t1end = icaltime_null_time();
 461         t2start = icaltime_null_time();
 462         t1end = icaltime_null_time();
 463
 464         /* Now compare cal to ird.cal */
 465         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 466         if (p == NULL) return;
 467         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 468
 469         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 470         if (p != NULL) t2end = icalproperty_get_dtend(p);
 471
 472         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 473         if (p == NULL) return;
 474         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 475
 476         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 477         if (p != NULL) t1end = icalproperty_get_dtend(p);
 478
 479         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 480         if (p != NULL) {
 481                 strcpy(compare_uid, icalproperty_get_comment(p));
 482         }
 483
 484         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 485         if (p != NULL) {
 486                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 487         }
 488
 489         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 490         if (p != NULL) {
 491                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 492         }
 493
 494
 495         icalcomponent_free(ird.cal);
 496
 497         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 498                 cprintf("%ld||%s|%s|%d|\n",
 499                         msgnum,
 500                         conflict_event_uid,
 501                         conflict_event_summary,
 502                         (       ((strlen(compare_uid)>0)
 503                                 &&(!strcasecmp(compare_uid,
 504                                 conflict_event_uid))) ? 1 : 0
 505                         )
 506                 );
 507         }
 508 }
 509
 510
 511
 512 /*
 513  * Phase 2 of "hunt for conflicts" operation.
 514  * At this point we have a calendar object which represents the VEVENT that
 515  * we're considering adding to the calendar.  Now hunt through the user's
 516  * calendar room, and output zero or more existing VEVENTs which conflict
 517  * with this one.
 518  */
 519 void ical_hunt_for_conflicts(icalcomponent *cal) {
 520         char hold_rm[ROOMNAMELEN];
 521
 522         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 523
 524         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 525                 getroom(&CC->quickroom, hold_rm);
 526                 cprintf("%d You do not have a calendar.\n", ERROR);
 527                 return;
 528         }
 529
 530         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 531
 532         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 533                 NULL,
 534                 ical_hunt_for_conflicts_backend,
 535                 (void *) cal
 536         );
 537
 538         cprintf("000\n");
 539         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 540
 541 }
 542
 543
 544
 545 /*
 546  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 547  */
 548 void ical_conflicts(long msgnum, char *partnum) {
 549         struct CtdlMessage *msg;
 550         struct ical_respond_data ird;
 551
 552         msg = CtdlFetchMessage(msgnum);
 553         if (msg == NULL) {
 554                 cprintf("%d Message %ld not found.\n",
 555                         ERROR+ILLEGAL_VALUE,
 556                         (long)msgnum
 557                 );
 558                 return;
 559         }
 560
 561         memset(&ird, 0, sizeof ird);
 562         strcpy(ird.desired_partnum, partnum);
 563         mime_parser(msg->cm_fields['M'],
 564                 NULL,
 565                 *ical_locate_part,              /* callback function */
 566                 NULL, NULL,
 567                 (void *) &ird,                  /* user data */
 568                 0
 569         );
 570
 571         CtdlFreeMessage(msg);
 572
 573         if (ird.cal != NULL) {
 574                 ical_hunt_for_conflicts(ird.cal);
 575                 icalcomponent_free(ird.cal);
 576                 return;
 577         }
 578         else {
 579                 cprintf("%d No calendar object found\n", ERROR);
 580                 return;
 581         }
 582
 583         /* should never get here */
 584 }
 585
 586
 587
 588
 589 /*
 590  * All Citadel calendar commands from the client come through here.
 591  */
 592 void cmd_ical(char *argbuf)
 593 {
 594         char subcmd[SIZ];
 595         long msgnum;
 596         char partnum[SIZ];
 597         char action[SIZ];
 598
 599         if (CtdlAccessCheck(ac_logged_in)) return;
 600
 601         extract(subcmd, argbuf, 0);
 602
 603         if (!strcmp(subcmd, "test")) {
 604                 cprintf("%d This server supports calendaring\n", CIT_OK);
 605                 return;
 606         }
 607
 608         else if (!strcmp(subcmd, "respond")) {
 609                 msgnum = extract_long(argbuf, 1);
 610                 extract(partnum, argbuf, 2);
 611                 extract(action, argbuf, 3);
 612                 ical_respond(msgnum, partnum, action);
 613         }
 614
 615         else if (!strcmp(subcmd, "conflicts")) {
 616                 msgnum = extract_long(argbuf, 1);
 617                 extract(partnum, argbuf, 2);
 618                 ical_conflicts(msgnum, partnum);
 619         }
 620
 621         else {
 622                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 623                 return;
 624         }
 625
 626         /* should never get here */
 627 }
 628
 629
 630
 631 /*
 632  * We don't know if the calendar room exists so we just create it at login
 633  */
 634 void ical_create_room(void)
 635 {
 636         struct quickroom qr;
 637         struct visit vbuf;
 638
 639         /* Create the calendar room if it doesn't already exist */
 640         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
 641
 642         /* Set expiration policy to manual; otherwise objects will be lost! */
 643         if (lgetroom(&qr, USERCALENDARROOM)) {
 644                 lprintf(3, "Couldn't get the user calendar room!\n");
 645                 return;
 646         }
 647         qr.QRep.expire_mode = EXPIRE_MANUAL;
 648         lputroom(&qr);
 649
 650         /* Set the view to a calendar view */
 651         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 652         vbuf.v_view = 3;        /* 3 = calendar */
 653         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 654
 655         /* Create the tasks list room if it doesn't already exist */
 656         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
 657
 658         /* Set expiration policy to manual; otherwise objects will be lost! */
 659         if (lgetroom(&qr, USERTASKSROOM)) {
 660                 lprintf(3, "Couldn't get the user calendar room!\n");
 661                 return;
 662         }
 663         qr.QRep.expire_mode = EXPIRE_MANUAL;
 664         lputroom(&qr);
 665
 666         /* Set the view to a task list view */
 667         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 668         vbuf.v_view = 4;        /* 4 = tasks */
 669         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 670
 671         return;
 672 }
 673
 674
 675 /*
 676  * ical_send_out_invitations() is called by ical_saving_vevent() when it
 677  * finds a VEVENT.   FIXME ... finish implementing.
 678  */
 679 void ical_send_out_invitations(icalcomponent *cal) {
 680         icalcomponent *the_request = NULL;
 681         char *serialized_request = NULL;
 682         char *request_message_text = NULL;
 683         struct CtdlMessage *msg = NULL;
 684         struct recptypes *valid = NULL;
 685         char attendees_string[SIZ];
 686         char this_attendee[SIZ];
 687         icalproperty *attendee = NULL;
 688         char summary_string[SIZ];
 689         icalproperty *summary = NULL;
 690         icalcomponent *encaps = NULL;
 691
 692         if (cal == NULL) {
 693                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 694                 return;
 695         }
 696
 697         /* Clone the event */
 698         the_request = icalcomponent_new_clone(cal);
 699         if (the_request == NULL) {
 700                 lprintf(3, "ERROR: cannot clone calendar object\n");
 701                 return;
 702         }
 703
 704         /* Extract the summary string -- we'll use it as the
 705          * message subject for the request
 706          */
 707         strcpy(summary_string, "Meeting request");
 708         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
 709         if (summary != NULL) {
 710                 if (icalproperty_get_summary(summary)) {
 711                         strcpy(summary_string,
 712                                 icalproperty_get_summary(summary) );
 713                 }
 714         }
 715
 716         /* Determine who the recipients of this message are (the attendees) */
 717         strcpy(attendees_string, "");
 718         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
 719                 if (icalproperty_get_attendee(attendee)) {
 720                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
 721                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
 722                                 strcpy(this_attendee, &this_attendee[7]);
 723                                 snprintf(&attendees_string[strlen(attendees_string)],
 724                                         sizeof(attendees_string) - strlen(attendees_string),
 725                                         "%s, ",
 726                                         this_attendee
 727                                 );
 728                         }
 729                 }
 730         }
 731
 732         lprintf(9, "attendees_string: <%s>\n", attendees_string);
 733
 734         /* Encapsulate the VEVENT component into a complete VCALENDAR */
 735         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
 736         if (encaps == NULL) {
 737                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
 738                         __FILE__, __LINE__);
 739                 icalcomponent_free(the_request);
 740                 return;
 741         }
 742
 743         /* Set the Product ID */
 744         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
 745
 746         /* Set the Version Number */
 747         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
 748
 749         /* Set the method to REQUEST */
 750         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
 751
 752         /* FIXME: here we need to insert a VTIMEZONE object. */
 753
 754         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
 755          * are responsible for "the_request"'s memory -- it will be freed
 756          * when we free "encaps".
 757          */
 758         icalcomponent_add_component(encaps, the_request);
 759
 760         /* Serialize it */
 761         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
 762         icalcomponent_free(encaps);     /* Don't need this anymore. */
 763         if (serialized_request == NULL) return;
 764
 765         request_message_text = mallok(strlen(serialized_request) + SIZ);
 766         if (request_message_text != NULL) {
 767                 sprintf(request_message_text,
 768                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 769                         serialized_request
 770                 );
 771
 772                 msg = CtdlMakeMessage(&CC->usersupp,
 773                         "",                     /* No single recipient here */
 774                         CC->quickroom.QRname, 0, FMT_RFC822,
 775                         "",
 776                         summary_string,         /* Use summary for subject */
 777                         request_message_text);
 778
 779                 if (msg != NULL) {
 780                         valid = validate_recipients(attendees_string);
 781                         CtdlSubmitMsg(msg, valid, "");
 782                         CtdlFreeMessage(msg);
 783                 }
 784         }
 785         phree(serialized_request);
 786 }
 787
 788
 789 /*
 790  * When a calendar object is being saved, determine whether it's a VEVENT
 791  * and the user saving it is the organizer.  If so, send out invitations
 792  * to any listed attendees.
 793  *
 794  */
 795 void ical_saving_vevent(icalcomponent *cal) {
 796         icalcomponent *c;
 797         icalproperty *organizer = NULL;
 798         char organizer_string[SIZ];
 799
 800         strcpy(organizer_string, "");
 801         /*
 802          * The VEVENT subcomponent is the one we're interested in.
 803          * Send out invitations if, and only if, this user is the Organizer.
 804          */
 805         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 806                 organizer = icalcomponent_get_first_property(cal,
 807                                                 ICAL_ORGANIZER_PROPERTY);
 808                 if (organizer != NULL) {
 809                         if (icalproperty_get_organizer(organizer)) {
 810                                 strcpy(organizer_string,
 811                                         icalproperty_get_organizer(organizer));
 812                         }
 813                 }
 814                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 815                         strcpy(organizer_string, &organizer_string[7]);
 816                         striplt(organizer_string);
 817                         /*
 818                          * If the user saving the event is listed as the
 819                          * organizer, then send out invitations.
 820                          */
 821                         if (CtdlIsMe(organizer_string)) {
 822                                 ical_send_out_invitations(cal);
 823                         }
 824                 }
 825         }
 826
 827         /* If the component has subcomponents, recurse through them. */
 828         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 829             (c != NULL);
 830             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 831                 /* Recursively process subcomponent */
 832                 ical_saving_vevent(c);
 833         }
 834
 835 }
 836
 837
 838
 839 /*
 840  * Back end for ical_obj_beforesave()
 841  * This hunts for the UID of the calendar event.
 842  */
 843 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
 844                 char *disp, void *content, char *cbtype, size_t length,
 845                 char *encoding, void *cbuserdata)
 846 {
 847         icalcomponent *cal;
 848         icalproperty *p;
 849
 850         /* If this is a text/calendar object, hunt for the UID and drop it in
 851          * the "user data" pointer for the MIME parser.  When
 852          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 853          * to that string.
 854          */
 855         if (!strcasecmp(cbtype, "text/calendar")) {
 856                 cal = icalcomponent_new_from_string(content);
 857                 if (cal != NULL) {
 858                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 859                         if (p != NULL) {
 860                                 strcpy((char *)cbuserdata,
 861                                         icalproperty_get_comment(p)
 862                                 );
 863                         }
 864                         icalcomponent_free(cal);
 865                 }
 866         }
 867 }
 868
 869
 870
 871
 872
 873 /*
 874  * See if we need to prevent the object from being saved (we don't allow
 875  * MIME types other than text/calendar in the Calendar> room).  Also, when
 876  * saving an event to the calendar, set the message's Citadel extended message
 877  * ID to the UID of the object.  This causes our replication checker to
 878  * automatically delete any existing instances of the same object.  (Isn't
 879  * that cool?)
 880  */
 881 int ical_obj_beforesave(struct CtdlMessage *msg)
 882 {
 883         char roomname[ROOMNAMELEN];
 884         char *p;
 885         int a;
 886         char eidbuf[SIZ];
 887
 888         /*
 889          * Only messages with content-type text/calendar
 890          * may be saved to Calendar>.  If the message is bound for
 891          * Calendar> but doesn't have this content-type, throw an error
 892          * so that the message may not be posted.
 893          */
 894
 895         /* First determine if this is our room */
 896         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 897         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 898                 return 0;       /* It's not the Calendar room. */
 899         }
 900
 901         /* Then determine content-type of the message */
 902
 903         /* It must be an RFC822 message! */
 904         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 905         if (msg->cm_format_type != 4)
 906                 return 1;       /* You tried to save a non-RFC822 message! */
 907
 908         /* Find the Content-Type: header */
 909         p = msg->cm_fields['M'];
 910         a = strlen(p);
 911         while (--a > 0) {
 912                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 913                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 914                                 strcpy(eidbuf, "");
 915                                 mime_parser(msg->cm_fields['M'],
 916                                         NULL,
 917                                         *ical_ctdl_set_extended_msgid,
 918                                         NULL, NULL,
 919                                         (void *)eidbuf,
 920                                         0
 921                                 );
 922                                 if (strlen(eidbuf) > 0) {
 923                                         if (msg->cm_fields['E'] != NULL) {
 924                                                 phree(msg->cm_fields['E']);
 925                                         }
 926                                         msg->cm_fields['E'] = strdoop(eidbuf);
 927                                 }
 928                                 return 0;
 929                         }
 930                         else {
 931                                 return 1;
 932                         }
 933                 }
 934                 p++;
 935         }
 936
 937         /* Oops!  No Content-Type in this message!  How'd that happen? */
 938         lprintf(7, "RFC822 message with no Content-Type header!\n");
 939         return 1;
 940 }
 941
 942
 943 /*
 944  * Things we need to do after saving a calendar event.
 945  */
 946 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
 947                 char *disp, void *content, char *cbtype, size_t length,
 948                 char *encoding, void *cbuserdata)
 949 {
 950         icalcomponent *cal;
 951
 952         /* If this is a text/calendar object, hunt for the UID and drop it in
 953          * the "user data" pointer for the MIME parser.  When
 954          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 955          * to that string.
 956          */
 957         if (!strcasecmp(cbtype, "text/calendar")) {
 958                 cal = icalcomponent_new_from_string(content);
 959                 if (cal != NULL) {
 960                         ical_saving_vevent(cal);
 961                         icalcomponent_free(cal);
 962                 }
 963         }
 964 }
 965
 966
 967 /*
 968  * Things we need to do after saving a calendar event.
 969  */
 970 int ical_obj_aftersave(struct CtdlMessage *msg)
 971 {
 972         char roomname[ROOMNAMELEN];
 973         char *p;
 974         int a;
 975
 976         /*
 977          * If this isn't the Calendar> room, no further action is necessary.
 978          */
 979
 980         /* First determine if this is our room */
 981         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 982         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 983                 return 0;       /* It's not the Calendar room. */
 984         }
 985
 986         /* Then determine content-type of the message */
 987
 988         /* It must be an RFC822 message! */
 989         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 990         if (msg->cm_format_type != 4) return(1);
 991
 992         /* Find the Content-Type: header */
 993         p = msg->cm_fields['M'];
 994         a = strlen(p);
 995         while (--a > 0) {
 996                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 997                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 998                                 mime_parser(msg->cm_fields['M'],
 999                                         NULL,
1000                                         *ical_obj_aftersave_backend,
1001                                         NULL, NULL,
1002                                         NULL,
1003                                         0
1004                                 );
1005                                 return 0;
1006                         }
1007                         else {
1008                                 return 1;
1009                         }
1010                 }
1011                 p++;
1012         }
1013
1014         /* Oops!  No Content-Type in this message!  How'd that happen? */
1015         lprintf(7, "RFC822 message with no Content-Type header!\n");
1016         return 1;
1017 }
1018
1019
1020 #endif  /* HAVE_ICAL_H */
1021
1022 /*
1023  * Register this module with the Citadel server.
1024  */
1025 char *Dynamic_Module_Init(void)
1026 {
1027 #ifdef HAVE_ICAL_H
1028         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1029         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1030         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1031         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1032 #endif
1033         return "$Id$";
1034 }