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                         icalproperty_free(attendee);
 174                 }
 175
 176                 /* We found our own address in the attendee list. */
 177                 if (me_attend) {
 178                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 179                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 180
 181                         if (!strcasecmp(action, "accept")) {
 182                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 183                         }
 184                         else if (!strcasecmp(action, "decline")) {
 185                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 186                         }
 187                         else if (!strcasecmp(action, "tentative")) {
 188                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 189                         }
 190
 191                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 192
 193                         /* Now insert it back into the vevent. */
 194                         icalcomponent_add_property(vevent, me_attend);
 195                 }
 196
 197                 /* Figure out who to send this thing to */
 198                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 199                 if (organizer != NULL) {
 200                         if (icalproperty_get_organizer(organizer)) {
 201                                 strcpy(organizer_string,
 202                                         icalproperty_get_organizer(organizer) );
 203                         }
 204                 }
 205                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 206                         strcpy(organizer_string, &organizer_string[7]);
 207                         striplt(organizer_string);
 208                 } else {
 209                         strcpy(organizer_string, "");
 210                 }
 211
 212                 /* Extract the summary string -- we'll use it as the
 213                  * message subject for the reply
 214                  */
 215                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 216                 if (summary != NULL) {
 217                         if (icalproperty_get_summary(summary)) {
 218                                 strcpy(summary_string,
 219                                         icalproperty_get_summary(summary) );
 220                         }
 221                 }
 222
 223         }
 224
 225         /* Now generate the reply message and send it out. */
 226         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 227         icalcomponent_free(the_reply);  /* don't need this anymore */
 228         if (serialized_reply == NULL) return;
 229
 230         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 231         if (reply_message_text != NULL) {
 232                 sprintf(reply_message_text,
 233                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 234                         serialized_reply
 235                 );
 236
 237                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 238                         CC->quickroom.QRname, 0, FMT_RFC822,
 239                         "",
 240                         summary_string,         /* Use summary for subject */
 241                         reply_message_text);
 242
 243                 if (msg != NULL) {
 244                         valid = validate_recipients(organizer_string);
 245                         CtdlSubmitMsg(msg, valid, "");
 246                         CtdlFreeMessage(msg);
 247                 }
 248         }
 249         phree(serialized_reply);
 250 }
 251
 252
 253
 254 /*
 255  * Callback function for mime parser that hunts for calendar content types
 256  * and turns them into calendar objects
 257  */
 258 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 259                 void *content, char *cbtype, size_t length, char *encoding,
 260                 void *cbuserdata) {
 261
 262         struct ical_respond_data *ird = NULL;
 263
 264         ird = (struct ical_respond_data *) cbuserdata;
 265         if (ird->cal != NULL) {
 266                 icalcomponent_free(ird->cal);
 267                 ird->cal = NULL;
 268         }
 269         if (strcasecmp(partnum, ird->desired_partnum)) return;
 270         ird->cal = icalcomponent_new_from_string(content);
 271 }
 272
 273
 274 /*
 275  * Respond to a meeting request.
 276  */
 277 void ical_respond(long msgnum, char *partnum, char *action) {
 278         struct CtdlMessage *msg;
 279         struct ical_respond_data ird;
 280
 281         if (
 282            (strcasecmp(action, "accept"))
 283            && (strcasecmp(action, "decline"))
 284         ) {
 285                 cprintf("%d Action must be 'accept' or 'decline'\n",
 286                         ERROR + ILLEGAL_VALUE
 287                 );
 288                 return;
 289         }
 290
 291         msg = CtdlFetchMessage(msgnum);
 292         if (msg == NULL) {
 293                 cprintf("%d Message %ld not found.\n",
 294                         ERROR+ILLEGAL_VALUE,
 295                         (long)msgnum
 296                 );
 297                 return;
 298         }
 299
 300         memset(&ird, 0, sizeof ird);
 301         strcpy(ird.desired_partnum, partnum);
 302         mime_parser(msg->cm_fields['M'],
 303                 NULL,
 304                 *ical_locate_part,              /* callback function */
 305                 NULL, NULL,
 306                 (void *) &ird,                  /* user data */
 307                 0
 308         );
 309
 310         /* We're done with the incoming message, because we now have a
 311          * calendar object in memory.
 312          */
 313         CtdlFreeMessage(msg);
 314
 315         /*
 316          * Here is the real meat of this function.  Handle the event.
 317          */
 318         if (ird.cal != NULL) {
 319                 /* Save this in the user's calendar if necessary */
 320                 if (!strcasecmp(action, "accept")) {
 321                         ical_add(ird.cal, 0);
 322                 }
 323
 324                 /* Send a reply if necessary */
 325                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 326                         ical_send_a_reply(ird.cal, action);
 327                 }
 328
 329                 /* Now that we've processed this message, we don't need it
 330                  * anymore.  So delete it.
 331                  */
 332                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 333
 334                 /* Free the memory we allocated and return a response. */
 335                 icalcomponent_free(ird.cal);
 336                 ird.cal = NULL;
 337                 cprintf("%d ok\n", CIT_OK);
 338                 return;
 339         }
 340         else {
 341                 cprintf("%d No calendar object found\n", ERROR);
 342                 return;
 343         }
 344
 345         /* should never get here */
 346 }
 347
 348
 349 /*
 350  * Search for a property in both the top level and in a VEVENT subcomponent
 351  */
 352 icalproperty *ical_ctdl_get_subprop(
 353                 icalcomponent *cal,
 354                 icalproperty_kind which_prop
 355 ) {
 356         icalproperty *p;
 357         icalcomponent *c;
 358
 359         p = icalcomponent_get_first_property(cal, which_prop);
 360         if (p == NULL) {
 361                 c = icalcomponent_get_first_component(cal,
 362                                                         ICAL_VEVENT_COMPONENT);
 363                 if (c != NULL) {
 364                         p = icalcomponent_get_first_property(c, which_prop);
 365                 }
 366         }
 367         return p;
 368 }
 369
 370
 371 /*
 372  * Check to see if two events overlap.  Returns nonzero if they do.
 373  */
 374 int ical_ctdl_is_overlap(
 375                         struct icaltimetype t1start,
 376                         struct icaltimetype t1end,
 377                         struct icaltimetype t2start,
 378                         struct icaltimetype t2end
 379 ) {
 380
 381         if (icaltime_is_null_time(t1start)) return(0);
 382         if (icaltime_is_null_time(t2start)) return(0);
 383
 384         /* First, check for all-day events */
 385         if (t1start.is_date) {
 386                 if (!icaltime_compare_date_only(t1start, t2start)) {
 387                         return(1);
 388                 }
 389                 if (!icaltime_is_null_time(t2end)) {
 390                         if (!icaltime_compare_date_only(t1start, t2end)) {
 391                                 return(1);
 392                         }
 393                 }
 394         }
 395
 396         if (t2start.is_date) {
 397                 if (!icaltime_compare_date_only(t2start, t1start)) {
 398                         return(1);
 399                 }
 400                 if (!icaltime_is_null_time(t1end)) {
 401                         if (!icaltime_compare_date_only(t2start, t1end)) {
 402                                 return(1);
 403                         }
 404                 }
 405         }
 406
 407         /* Now check for overlaps using date *and* time. */
 408
 409         /* First, bail out if either event 1 or event 2 is missing end time. */
 410         if (icaltime_is_null_time(t1end)) return(0);
 411         if (icaltime_is_null_time(t2end)) return(0);
 412
 413         /* If event 1 ends before event 2 starts, we're in the clear. */
 414         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 415
 416         /* If event 2 ends before event 1 starts, we're also ok. */
 417         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 418
 419         /* Otherwise, they overlap. */
 420         return(1);
 421 }
 422
 423
 424
 425 /*
 426  * Backend for ical_hunt_for_conflicts()
 427  */
 428 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 429         icalcomponent *cal;
 430         struct CtdlMessage *msg;
 431         struct ical_respond_data ird;
 432         struct icaltimetype t1start, t1end, t2start, t2end;
 433         icalproperty *p;
 434         char conflict_event_uid[SIZ];
 435         char conflict_event_summary[SIZ];
 436         char compare_uid[SIZ];
 437
 438         cal = (icalcomponent *)data;
 439         strcpy(compare_uid, "");
 440         strcpy(conflict_event_uid, "");
 441         strcpy(conflict_event_summary, "");
 442
 443         msg = CtdlFetchMessage(msgnum);
 444         if (msg == NULL) return;
 445         memset(&ird, 0, sizeof ird);
 446         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 447         mime_parser(msg->cm_fields['M'],
 448                 NULL,
 449                 *ical_locate_part,              /* callback function */
 450                 NULL, NULL,
 451                 (void *) &ird,                  /* user data */
 452                 0
 453         );
 454         CtdlFreeMessage(msg);
 455
 456         if (ird.cal == NULL) return;
 457
 458         t1start = icaltime_null_time();
 459         t1end = icaltime_null_time();
 460         t2start = icaltime_null_time();
 461         t1end = icaltime_null_time();
 462
 463         /* Now compare cal to ird.cal */
 464         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 465         if (p == NULL) return;
 466         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 467
 468         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 469         if (p != NULL) t2end = icalproperty_get_dtend(p);
 470
 471         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 472         if (p == NULL) return;
 473         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 474
 475         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 476         if (p != NULL) t1end = icalproperty_get_dtend(p);
 477
 478         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 479         if (p != NULL) {
 480                 strcpy(compare_uid, icalproperty_get_comment(p));
 481         }
 482
 483         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 484         if (p != NULL) {
 485                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 486         }
 487
 488         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 489         if (p != NULL) {
 490                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 491         }
 492
 493
 494         icalcomponent_free(ird.cal);
 495
 496         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 497                 cprintf("%ld||%s|%s|%d|\n",
 498                         msgnum,
 499                         conflict_event_uid,
 500                         conflict_event_summary,
 501                         (       ((strlen(compare_uid)>0)
 502                                 &&(!strcasecmp(compare_uid,
 503                                 conflict_event_uid))) ? 1 : 0
 504                         )
 505                 );
 506         }
 507 }
 508
 509
 510
 511 /*
 512  * Phase 2 of "hunt for conflicts" operation.
 513  * At this point we have a calendar object which represents the VEVENT that
 514  * we're considering adding to the calendar.  Now hunt through the user's
 515  * calendar room, and output zero or more existing VEVENTs which conflict
 516  * with this one.
 517  */
 518 void ical_hunt_for_conflicts(icalcomponent *cal) {
 519         char hold_rm[ROOMNAMELEN];
 520
 521         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 522
 523         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 524                 getroom(&CC->quickroom, hold_rm);
 525                 cprintf("%d You do not have a calendar.\n", ERROR);
 526                 return;
 527         }
 528
 529         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 530
 531         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 532                 NULL,
 533                 ical_hunt_for_conflicts_backend,
 534                 (void *) cal
 535         );
 536
 537         cprintf("000\n");
 538         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 539
 540 }
 541
 542
 543
 544 /*
 545  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 546  */
 547 void ical_conflicts(long msgnum, char *partnum) {
 548         struct CtdlMessage *msg;
 549         struct ical_respond_data ird;
 550
 551         msg = CtdlFetchMessage(msgnum);
 552         if (msg == NULL) {
 553                 cprintf("%d Message %ld not found.\n",
 554                         ERROR+ILLEGAL_VALUE,
 555                         (long)msgnum
 556                 );
 557                 return;
 558         }
 559
 560         memset(&ird, 0, sizeof ird);
 561         strcpy(ird.desired_partnum, partnum);
 562         mime_parser(msg->cm_fields['M'],
 563                 NULL,
 564                 *ical_locate_part,              /* callback function */
 565                 NULL, NULL,
 566                 (void *) &ird,                  /* user data */
 567                 0
 568         );
 569
 570         CtdlFreeMessage(msg);
 571
 572         if (ird.cal != NULL) {
 573                 ical_hunt_for_conflicts(ird.cal);
 574                 icalcomponent_free(ird.cal);
 575                 return;
 576         }
 577         else {
 578                 cprintf("%d No calendar object found\n", ERROR);
 579                 return;
 580         }
 581
 582         /* should never get here */
 583 }
 584
 585
 586
 587
 588 /*
 589  * All Citadel calendar commands from the client come through here.
 590  */
 591 void cmd_ical(char *argbuf)
 592 {
 593         char subcmd[SIZ];
 594         long msgnum;
 595         char partnum[SIZ];
 596         char action[SIZ];
 597
 598         if (CtdlAccessCheck(ac_logged_in)) return;
 599
 600         extract(subcmd, argbuf, 0);
 601
 602         if (!strcmp(subcmd, "test")) {
 603                 cprintf("%d This server supports calendaring\n", CIT_OK);
 604                 return;
 605         }
 606
 607         else if (!strcmp(subcmd, "respond")) {
 608                 msgnum = extract_long(argbuf, 1);
 609                 extract(partnum, argbuf, 2);
 610                 extract(action, argbuf, 3);
 611                 ical_respond(msgnum, partnum, action);
 612         }
 613
 614         else if (!strcmp(subcmd, "conflicts")) {
 615                 msgnum = extract_long(argbuf, 1);
 616                 extract(partnum, argbuf, 2);
 617                 ical_conflicts(msgnum, partnum);
 618         }
 619
 620         else {
 621                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 622                 return;
 623         }
 624
 625         /* should never get here */
 626 }
 627
 628
 629
 630 /*
 631  * We don't know if the calendar room exists so we just create it at login
 632  */
 633 void ical_create_room(void)
 634 {
 635         struct quickroom qr;
 636         struct visit vbuf;
 637
 638         /* Create the calendar room if it doesn't already exist */
 639         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
 640
 641         /* Set expiration policy to manual; otherwise objects will be lost! */
 642         if (lgetroom(&qr, USERCALENDARROOM)) {
 643                 lprintf(3, "Couldn't get the user calendar room!\n");
 644                 return;
 645         }
 646         qr.QRep.expire_mode = EXPIRE_MANUAL;
 647         lputroom(&qr);
 648
 649         /* Set the view to a calendar view */
 650         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 651         vbuf.v_view = 3;        /* 3 = calendar */
 652         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 653
 654         /* Create the tasks list room if it doesn't already exist */
 655         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
 656
 657         /* Set expiration policy to manual; otherwise objects will be lost! */
 658         if (lgetroom(&qr, USERTASKSROOM)) {
 659                 lprintf(3, "Couldn't get the user calendar room!\n");
 660                 return;
 661         }
 662         qr.QRep.expire_mode = EXPIRE_MANUAL;
 663         lputroom(&qr);
 664
 665         /* Set the view to a task list view */
 666         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 667         vbuf.v_view = 4;        /* 4 = tasks */
 668         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 669
 670         return;
 671 }
 672
 673
 674 /*
 675  * ical_send_out_invitations() is called by ical_saving_vevent() when it
 676  * finds a VEVENT.   FIXME ... finish implementing.
 677  */
 678 void ical_send_out_invitations(icalcomponent *cal) {
 679         icalcomponent *the_request = NULL;
 680         char *serialized_request = NULL;
 681         char *request_message_text = NULL;
 682         struct CtdlMessage *msg = NULL;
 683         struct recptypes *valid = NULL;
 684         char attendees_string[SIZ];
 685         char this_attendee[SIZ];
 686         icalproperty *attendee = NULL;
 687         char *summary_string = NULL;
 688         icalproperty *summary = NULL;
 689
 690         if (cal == NULL) {
 691                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 692                 return;
 693         }
 694
 695         /* Clone the event */
 696         the_request = icalcomponent_new_clone(cal);
 697         if (the_request == NULL) {
 698                 lprintf(3, "ERROR: cannot clone calendar object\n");
 699                 return;
 700         }
 701
 702         /* Extract the summary string -- we'll use it as the
 703          * message subject for the request
 704          */
 705         strcpy(summary_string, "Meeting request");
 706         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
 707         if (summary != NULL) {
 708                 if (icalproperty_get_summary(summary)) {
 709                         strcpy(summary_string,
 710                                 icalproperty_get_summary(summary) );
 711                 }
 712         }
 713
 714         /* Set the method to REQUEST */
 715         icalcomponent_set_method(the_request, ICAL_METHOD_REQUEST);
 716
 717         /* Determine who the recipients of this message are (the attendees) */
 718         strcpy(attendees_string, "");
 719         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
 720                 if (icalproperty_get_attendee(attendee)) {
 721                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
 722                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
 723                                 strcpy(this_attendee, &this_attendee[7]);
 724                                 snprintf(&attendees_string[strlen(attendees_string)],
 725                                         sizeof(attendees_string) - strlen(attendees_string),
 726                                         "%s, ",
 727                                         this_attendee
 728                                 );
 729                         }
 730                 }
 731         }
 732
 733         lprintf(9, "attendees_string: <%s>\n", attendees_string);
 734
 735         /* Serialize it */
 736         serialized_request = strdoop(icalcomponent_as_ical_string(the_request));
 737         icalcomponent_free(the_request);        /* don't need this anymore */
 738         if (serialized_request == NULL) return;
 739
 740         request_message_text = mallok(strlen(serialized_request) + SIZ);
 741         if (request_message_text != NULL) {
 742                 sprintf(request_message_text,
 743                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 744                         serialized_request
 745                 );
 746
 747                 msg = CtdlMakeMessage(&CC->usersupp,
 748                         "",                     /* No single recipient here */
 749                         CC->quickroom.QRname, 0, FMT_RFC822,
 750                         "",
 751                         summary_string,         /* Use summary for subject */
 752                         request_message_text);
 753
 754                 if (msg != NULL) {
 755                         valid = validate_recipients(attendees_string);
 756                         CtdlSubmitMsg(msg, valid, "");
 757                         CtdlFreeMessage(msg);
 758                 }
 759         }
 760         phree(serialized_request);
 761 }
 762
 763
 764 /*
 765  * When a calendar object is being saved, determine whether it's a VEVENT
 766  * and the user saving it is the organizer.  If so, send out invitations
 767  * to any listed attendees.
 768  *
 769  */
 770 void ical_saving_vevent(icalcomponent *cal) {
 771         icalcomponent *c;
 772         icalproperty *organizer = NULL;
 773         char organizer_string[SIZ];
 774
 775         strcpy(organizer_string, "");
 776         /*
 777          * The VEVENT subcomponent is the one we're interested in.
 778          * Send out invitations if, and only if, this user is the Organizer.
 779          */
 780         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 781                 organizer = icalcomponent_get_first_property(cal,
 782                                                 ICAL_ORGANIZER_PROPERTY);
 783                 if (organizer != NULL) {
 784                         if (icalproperty_get_organizer(organizer)) {
 785                                 strcpy(organizer_string,
 786                                         icalproperty_get_organizer(organizer));
 787                         }
 788                 }
 789                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 790                         strcpy(organizer_string, &organizer_string[7]);
 791                         striplt(organizer_string);
 792                         /*
 793                          * If the user saving the event is listed as the
 794                          * organizer, then send out invitations.
 795                          */
 796                         if (CtdlIsMe(organizer_string)) {
 797                                 ical_send_out_invitations(cal);
 798                         }
 799                 }
 800         }
 801
 802         /* If the component has subcomponents, recurse through them. */
 803         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 804             (c != NULL);
 805             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 806                 /* Recursively process subcomponent */
 807                 ical_saving_vevent(c);
 808         }
 809
 810 }
 811
 812
 813
 814 /*
 815  * Back end for ical_obj_beforesave()
 816  * This hunts for the UID of the calendar event.
 817  */
 818 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
 819                 char *disp, void *content, char *cbtype, size_t length,
 820                 char *encoding, void *cbuserdata)
 821 {
 822         icalcomponent *cal;
 823         icalproperty *p;
 824
 825         /* If this is a text/calendar object, hunt for the UID and drop it in
 826          * the "user data" pointer for the MIME parser.  When
 827          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 828          * to that string.
 829          */
 830         if (!strcasecmp(cbtype, "text/calendar")) {
 831                 cal = icalcomponent_new_from_string(content);
 832                 if (cal != NULL) {
 833                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 834                         if (p != NULL) {
 835                                 strcpy((char *)cbuserdata,
 836                                         icalproperty_get_comment(p)
 837                                 );
 838                         }
 839                         icalcomponent_free(cal);
 840                 }
 841         }
 842 }
 843
 844
 845
 846
 847
 848 /*
 849  * See if we need to prevent the object from being saved (we don't allow
 850  * MIME types other than text/calendar in the Calendar> room).  Also, when
 851  * saving an event to the calendar, set the message's Citadel extended message
 852  * ID to the UID of the object.  This causes our replication checker to
 853  * automatically delete any existing instances of the same object.  (Isn't
 854  * that cool?)
 855  */
 856 int ical_obj_beforesave(struct CtdlMessage *msg)
 857 {
 858         char roomname[ROOMNAMELEN];
 859         char *p;
 860         int a;
 861         char eidbuf[SIZ];
 862
 863         /*
 864          * Only messages with content-type text/calendar
 865          * may be saved to Calendar>.  If the message is bound for
 866          * Calendar> but doesn't have this content-type, throw an error
 867          * so that the message may not be posted.
 868          */
 869
 870         /* First determine if this is our room */
 871         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 872         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 873                 return 0;       /* It's not the Calendar room. */
 874         }
 875
 876         /* Then determine content-type of the message */
 877
 878         /* It must be an RFC822 message! */
 879         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 880         if (msg->cm_format_type != 4)
 881                 return 1;       /* You tried to save a non-RFC822 message! */
 882
 883         /* Find the Content-Type: header */
 884         p = msg->cm_fields['M'];
 885         a = strlen(p);
 886         while (--a > 0) {
 887                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 888                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 889                                 strcpy(eidbuf, "");
 890                                 mime_parser(msg->cm_fields['M'],
 891                                         NULL,
 892                                         *ical_ctdl_set_extended_msgid,
 893                                         NULL, NULL,
 894                                         (void *)eidbuf,
 895                                         0
 896                                 );
 897                                 if (strlen(eidbuf) > 0) {
 898                                         if (msg->cm_fields['E'] != NULL) {
 899                                                 phree(msg->cm_fields['E']);
 900                                         }
 901                                         msg->cm_fields['E'] = strdoop(eidbuf);
 902                                 }
 903                                 return 0;
 904                         }
 905                         else {
 906                                 return 1;
 907                         }
 908                 }
 909                 p++;
 910         }
 911
 912         /* Oops!  No Content-Type in this message!  How'd that happen? */
 913         lprintf(7, "RFC822 message with no Content-Type header!\n");
 914         return 1;
 915 }
 916
 917
 918 /*
 919  * Things we need to do after saving a calendar event.
 920  */
 921 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
 922                 char *disp, void *content, char *cbtype, size_t length,
 923                 char *encoding, void *cbuserdata)
 924 {
 925         icalcomponent *cal;
 926
 927         /* If this is a text/calendar object, hunt for the UID and drop it in
 928          * the "user data" pointer for the MIME parser.  When
 929          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
 930          * to that string.
 931          */
 932         if (!strcasecmp(cbtype, "text/calendar")) {
 933                 cal = icalcomponent_new_from_string(content);
 934                 if (cal != NULL) {
 935                         ical_saving_vevent(cal);
 936                         icalcomponent_free(cal);
 937                 }
 938         }
 939 }
 940
 941
 942 /*
 943  * Things we need to do after saving a calendar event.
 944  */
 945 int ical_obj_aftersave(struct CtdlMessage *msg)
 946 {
 947         char roomname[ROOMNAMELEN];
 948         char *p;
 949         int a;
 950
 951         /*
 952          * If this isn't the Calendar> room, no further action is necessary.
 953          */
 954
 955         /* First determine if this is our room */
 956         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 957         if (strcasecmp(roomname, CC->quickroom.QRname)) {
 958                 return 0;       /* It's not the Calendar room. */
 959         }
 960
 961         /* Then determine content-type of the message */
 962
 963         /* It must be an RFC822 message! */
 964         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
 965         if (msg->cm_format_type != 4) return(1);
 966
 967         /* Find the Content-Type: header */
 968         p = msg->cm_fields['M'];
 969         a = strlen(p);
 970         while (--a > 0) {
 971                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
 972                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
 973                                 mime_parser(msg->cm_fields['M'],
 974                                         NULL,
 975                                         *ical_obj_aftersave_backend,
 976                                         NULL, NULL,
 977                                         NULL,
 978                                         0
 979                                 );
 980                                 return 0;
 981                         }
 982                         else {
 983                                 return 1;
 984                         }
 985                 }
 986                 p++;
 987         }
 988
 989         /* Oops!  No Content-Type in this message!  How'd that happen? */
 990         lprintf(7, "RFC822 message with no Content-Type header!\n");
 991         return 1;
 992 }
 993
 994
 995 #endif  /* HAVE_ICAL_H */
 996
 997 /*
 998  * Register this module with the Citadel server.
 999  */
1000 char *Dynamic_Module_Init(void)
1001 {
1002 #ifdef HAVE_ICAL_H
1003         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1004         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1005         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1006         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1007 #endif
1008         return "$Id$";
1009 }