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 "citadel.h"
  22 #include "server.h"
  23 #include "citserver.h"
  24 #include "sysdep_decls.h"
  25 #include "support.h"
  26 #include "config.h"
  27 #include "serv_extensions.h"
  28 #include "user_ops.h"
  29 #include "room_ops.h"
  30 #include "tools.h"
  31 #include "msgbase.h"
  32 #include "mime_parser.h"
  33 #include "serv_calendar.h"
  34
  35 #ifdef CITADEL_WITH_CALENDAR_SERVICE
  36
  37 #include <ical.h>
  38 #include "ical_dezonify.h"
  39
  40 struct ical_respond_data {
  41         char desired_partnum[SIZ];
  42         icalcomponent *cal;
  43 };
  44
  45 /* Session-local data for calendaring. */
  46 long SYM_CIT_ICAL;
  47
  48
  49 /*
  50  * Utility function to create a new VCALENDAR component with some of the
  51  * required fields already set the way we like them.
  52  */
  53 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  54         icalcomponent *encaps;
  55
  56         encaps = icalcomponent_new_vcalendar();
  57         if (encaps == NULL) {
  58                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
  59                         __FILE__, __LINE__);
  60                 return NULL;
  61         }
  62
  63         /* Set the Product ID */
  64         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  65
  66         /* Set the Version Number */
  67         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  68 }
  69
  70
  71 /*
  72  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  73  */
  74 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  75         icalcomponent *encaps;
  76
  77         /* If we're already looking at a full VCALENDAR component,
  78          * don't bother ... just return itself.
  79          */
  80         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  81                 return subcomp;
  82         }
  83
  84         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  85         encaps = icalcomponent_new_citadel_vcalendar();
  86         if (encaps == NULL) return NULL;
  87
  88         /* Encapsulate the subcomponent inside */
  89         icalcomponent_add_component(encaps, subcomp);
  90
  91         /* Convert all timestamps to UTC so we don't have to deal with
  92          * stupid VTIMEZONE crap.
  93          */
  94         ical_dezonify(encaps);
  95
  96         /* Return the object we just created. */
  97         return(encaps);
  98 }
  99
 100
 101
 102
 103 /*
 104  * Write a calendar object into the specified user's calendar room.
 105  *
 106  * ok
 107  */
 108 void ical_write_to_cal(struct usersupp *u, icalcomponent *cal) {
 109         char temp[PATH_MAX];
 110         FILE *fp;
 111         char *ser;
 112         icalcomponent *encaps;
 113
 114         if (cal == NULL) return;
 115
 116         /* If the supplied object is a subcomponent, encapsulate it in
 117          * a full VCALENDAR component, and save that instead.
 118          */
 119         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 120                 encaps = ical_encapsulate_subcomponent(
 121                         icalcomponent_new_clone(cal)
 122                 );
 123                 ical_write_to_cal(u, encaps);
 124                 icalcomponent_free(encaps);
 125                 return;
 126         }
 127
 128         strcpy(temp, tmpnam(NULL));
 129         ser = icalcomponent_as_ical_string(cal);
 130         if (ser == NULL) return;
 131
 132         /* Make a temp file out of it */
 133         fp = fopen(temp, "w");
 134         if (fp == NULL) return;
 135         fwrite(ser, strlen(ser), 1, fp);
 136         fclose(fp);
 137
 138         /* This handy API function does all the work for us.
 139          */
 140         CtdlWriteObject(USERCALENDARROOM,       /* which room */
 141                         "text/calendar",        /* MIME type */
 142                         temp,                   /* temp file */
 143                         u,                      /* which user */
 144                         0,                      /* not binary */
 145                         0,              /* don't delete others of this type */
 146                         0);                     /* no flags */
 147
 148         unlink(temp);
 149 }
 150
 151
 152 /*
 153  * Add a calendar object to the user's calendar
 154  *
 155  * ok because it uses ical_write_to_cal()
 156  */
 157 void ical_add(icalcomponent *cal, int recursion_level) {
 158         icalcomponent *c;
 159
 160         /*
 161          * The VEVENT subcomponent is the one we're interested in saving.
 162          */
 163         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 164
 165                 ical_write_to_cal(&CC->usersupp, cal);
 166
 167         }
 168
 169         /* If the component has subcomponents, recurse through them. */
 170         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 171             (c != 0);
 172             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 173                 /* Recursively process subcomponent */
 174                 ical_add(c, recursion_level+1);
 175         }
 176
 177 }
 178
 179
 180
 181 /*
 182  * Send a reply to a meeting invitation.
 183  *
 184  * 'request' is the invitation to reply to.
 185  * 'action' is the string "accept" or "decline".
 186  *
 187  * (Sorry about this being more than 80 columns ... there was just
 188  * no easy way to break it down sensibly.)
 189  *
 190  * ok
 191  */
 192 void ical_send_a_reply(icalcomponent *request, char *action) {
 193         icalcomponent *the_reply = NULL;
 194         icalcomponent *vevent = NULL;
 195         icalproperty *attendee = NULL;
 196         char attendee_string[SIZ];
 197         icalproperty *organizer = NULL;
 198         char organizer_string[SIZ];
 199         icalproperty *summary = NULL;
 200         char summary_string[SIZ];
 201         icalproperty *me_attend = NULL;
 202         struct recptypes *recp = NULL;
 203         icalparameter *partstat = NULL;
 204         char *serialized_reply = NULL;
 205         char *reply_message_text = NULL;
 206         struct CtdlMessage *msg = NULL;
 207         struct recptypes *valid = NULL;
 208
 209         strcpy(organizer_string, "");
 210         strcpy(summary_string, "Calendar item");
 211
 212         if (request == NULL) {
 213                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 214                 return;
 215         }
 216
 217         the_reply = icalcomponent_new_clone(request);
 218         if (the_reply == NULL) {
 219                 lprintf(3, "ERROR: cannot clone request\n");
 220                 return;
 221         }
 222
 223         /* Change the method from REQUEST to REPLY */
 224         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 225
 226         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 227         if (vevent != NULL) {
 228                 /* Hunt for attendees, removing ones that aren't us.
 229                  * (Actually, remove them all, cloning our own one so we can
 230                  * re-insert it later)
 231                  */
 232                 while (attendee = icalcomponent_get_first_property(vevent,
 233                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 234                 ) {
 235                         if (icalproperty_get_attendee(attendee)) {
 236                                 strcpy(attendee_string,
 237                                         icalproperty_get_attendee(attendee) );
 238                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 239                                         strcpy(attendee_string, &attendee_string[7]);
 240                                         striplt(attendee_string);
 241                                         recp = validate_recipients(attendee_string);
 242                                         if (recp != NULL) {
 243                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 244                                                         if (me_attend) icalproperty_free(me_attend);
 245                                                         me_attend = icalproperty_new_clone(attendee);
 246                                                 }
 247                                                 phree(recp);
 248                                         }
 249                                 }
 250                         }
 251                         /* Remove it... */
 252                         icalcomponent_remove_property(vevent, attendee);
 253                         icalproperty_free(attendee);
 254                 }
 255
 256                 /* We found our own address in the attendee list. */
 257                 if (me_attend) {
 258                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 259                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 260
 261                         if (!strcasecmp(action, "accept")) {
 262                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 263                         }
 264                         else if (!strcasecmp(action, "decline")) {
 265                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 266                         }
 267                         else if (!strcasecmp(action, "tentative")) {
 268                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 269                         }
 270
 271                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 272
 273                         /* Now insert it back into the vevent. */
 274                         icalcomponent_add_property(vevent, me_attend);
 275                 }
 276
 277                 /* Figure out who to send this thing to */
 278                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 279                 if (organizer != NULL) {
 280                         if (icalproperty_get_organizer(organizer)) {
 281                                 strcpy(organizer_string,
 282                                         icalproperty_get_organizer(organizer) );
 283                         }
 284                 }
 285                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 286                         strcpy(organizer_string, &organizer_string[7]);
 287                         striplt(organizer_string);
 288                 } else {
 289                         strcpy(organizer_string, "");
 290                 }
 291
 292                 /* Extract the summary string -- we'll use it as the
 293                  * message subject for the reply
 294                  */
 295                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 296                 if (summary != NULL) {
 297                         if (icalproperty_get_summary(summary)) {
 298                                 strcpy(summary_string,
 299                                         icalproperty_get_summary(summary) );
 300                         }
 301                 }
 302
 303         }
 304
 305         /* Now generate the reply message and send it out. */
 306         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 307         icalcomponent_free(the_reply);  /* don't need this anymore */
 308         if (serialized_reply == NULL) return;
 309
 310         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 311         if (reply_message_text != NULL) {
 312                 sprintf(reply_message_text,
 313                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 314                         serialized_reply
 315                 );
 316
 317                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 318                         CC->quickroom.QRname, 0, FMT_RFC822,
 319                         "",
 320                         summary_string,         /* Use summary for subject */
 321                         reply_message_text);
 322
 323                 if (msg != NULL) {
 324                         valid = validate_recipients(organizer_string);
 325                         CtdlSubmitMsg(msg, valid, "");
 326                         CtdlFreeMessage(msg);
 327                 }
 328         }
 329         phree(serialized_reply);
 330 }
 331
 332
 333
 334 /*
 335  * Callback function for mime parser that hunts for calendar content types
 336  * and turns them into calendar objects
 337  */
 338 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 339                 void *content, char *cbtype, size_t length, char *encoding,
 340                 void *cbuserdata) {
 341
 342         struct ical_respond_data *ird = NULL;
 343
 344         ird = (struct ical_respond_data *) cbuserdata;
 345
 346         /* desired_partnum can be set to "_HUNT_" to have it just look for
 347          * the first part with a content type of text/calendar.  Otherwise
 348          * we have to only process the right one.
 349          */
 350         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 351                 if (strcasecmp(partnum, ird->desired_partnum)) {
 352                         return;
 353                 }
 354         }
 355
 356         if (strcasecmp(cbtype, "text/calendar")) {
 357                 return;
 358         }
 359
 360         if (ird->cal != NULL) {
 361                 icalcomponent_free(ird->cal);
 362                 ird->cal = NULL;
 363         }
 364
 365         ird->cal = icalcomponent_new_from_string(content);
 366         if (ird->cal != NULL) {
 367                 ical_dezonify(ird->cal);
 368         }
 369 }
 370
 371
 372 /*
 373  * Respond to a meeting request.
 374  */
 375 void ical_respond(long msgnum, char *partnum, char *action) {
 376         struct CtdlMessage *msg;
 377         struct ical_respond_data ird;
 378
 379         if (
 380            (strcasecmp(action, "accept"))
 381            && (strcasecmp(action, "decline"))
 382         ) {
 383                 cprintf("%d Action must be 'accept' or 'decline'\n",
 384                         ERROR + ILLEGAL_VALUE
 385                 );
 386                 return;
 387         }
 388
 389         msg = CtdlFetchMessage(msgnum);
 390         if (msg == NULL) {
 391                 cprintf("%d Message %ld not found.\n",
 392                         ERROR+ILLEGAL_VALUE,
 393                         (long)msgnum
 394                 );
 395                 return;
 396         }
 397
 398         memset(&ird, 0, sizeof ird);
 399         strcpy(ird.desired_partnum, partnum);
 400         mime_parser(msg->cm_fields['M'],
 401                 NULL,
 402                 *ical_locate_part,              /* callback function */
 403                 NULL, NULL,
 404                 (void *) &ird,                  /* user data */
 405                 0
 406         );
 407
 408         /* We're done with the incoming message, because we now have a
 409          * calendar object in memory.
 410          */
 411         CtdlFreeMessage(msg);
 412
 413         /*
 414          * Here is the real meat of this function.  Handle the event.
 415          */
 416         if (ird.cal != NULL) {
 417                 /* Save this in the user's calendar if necessary */
 418                 if (!strcasecmp(action, "accept")) {
 419                         ical_add(ird.cal, 0);
 420                 }
 421
 422                 /* Send a reply if necessary */
 423                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 424                         ical_send_a_reply(ird.cal, action);
 425                 }
 426
 427                 /* Now that we've processed this message, we don't need it
 428                  * anymore.  So delete it.
 429                  */
 430                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 431
 432                 /* Free the memory we allocated and return a response. */
 433                 icalcomponent_free(ird.cal);
 434                 ird.cal = NULL;
 435                 cprintf("%d ok\n", CIT_OK);
 436                 return;
 437         }
 438         else {
 439                 cprintf("%d No calendar object found\n", ERROR);
 440                 return;
 441         }
 442
 443         /* should never get here */
 444 }
 445
 446
 447 /*
 448  * Figure out the UID of the calendar event being referred to in a
 449  * REPLY object.  This function is recursive.
 450  */
 451 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 452         icalcomponent *subcomponent;
 453         icalproperty *p;
 454
 455         /* If this object is a REPLY, then extract the UID. */
 456         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 457                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 458                 if (p != NULL) {
 459                         strcpy(uidbuf, icalproperty_get_comment(p));
 460                 }
 461         }
 462
 463         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 464          * UID of the reply; we want the UID of the invitation being replied to.
 465          */
 466         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 467             subcomponent != NULL;
 468             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 469                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 470         }
 471 }
 472
 473
 474 /*
 475  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 476  * locate the message containing the calendar event we're replying to, this function
 477  * gets called.  It basically just sticks the message number in a supplied buffer.
 478  */
 479 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 480         long *msgnumptr;
 481
 482         msgnumptr = (long *) data;
 483         *msgnumptr = msgnum;
 484 }
 485
 486
 487 struct original_event_container {
 488         icalcomponent *c;
 489 };
 490
 491 /*
 492  * Callback function for mime parser that hunts for calendar content types
 493  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 494  * to fetch the object being updated)
 495  */
 496 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 497                 void *content, char *cbtype, size_t length, char *encoding,
 498                 void *cbuserdata) {
 499
 500         struct original_event_container *oec = NULL;
 501
 502         if (strcasecmp(cbtype, "text/calendar")) {
 503                 return;
 504         }
 505         oec = (struct original_event_container *) cbuserdata;
 506         if (oec->c != NULL) {
 507                 icalcomponent_free(oec->c);
 508         }
 509         oec->c = icalcomponent_new_from_string(content);
 510 }
 511
 512
 513 /*
 514  * Merge updated attendee information from a REPLY into an existing event.
 515  */
 516 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 517         icalcomponent *c;
 518         icalproperty *e_attendee, *r_attendee;
 519
 520         /* First things first.  If we're not looking at a VEVENT component,
 521          * recurse through subcomponents until we find one.
 522          */
 523         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 524                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 525                     c != NULL;
 526                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 527                         ical_merge_attendee_reply(c, reply);
 528                 }
 529                 return;
 530         }
 531
 532         /* Now do the same thing with the reply.
 533          */
 534         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 535                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 536                     c != NULL;
 537                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 538                         ical_merge_attendee_reply(event, c);
 539                 }
 540                 return;
 541         }
 542
 543         /* Clone the reply, because we're going to rip its guts out. */
 544         reply = icalcomponent_new_clone(reply);
 545
 546         /* At this point we're looking at the correct subcomponents.
 547          * Iterate through the attendees looking for a match.
 548          */
 549 STARTOVER:
 550         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 551             e_attendee != NULL;
 552             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 553
 554                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 555                     r_attendee != NULL;
 556                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 557
 558                         /* Check to see if these two attendees match...
 559                          */
 560                         if (!strcasecmp(
 561                            icalproperty_get_attendee(e_attendee),
 562                            icalproperty_get_attendee(r_attendee)
 563                         )) {
 564                                 /* ...and if they do, remove the attendee from the event
 565                                  * and replace it with the attendee from the reply.  (The
 566                                  * reply's copy will have the same address, but an updated
 567                                  * status.)
 568                                  */
 569                                 TRACE;
 570                                 icalcomponent_remove_property(event, e_attendee);
 571                                 TRACE;
 572                                 icalproperty_free(e_attendee);
 573                                 TRACE;
 574                                 icalcomponent_remove_property(reply, r_attendee);
 575                                 TRACE;
 576                                 icalcomponent_add_property(event, r_attendee);
 577                                 TRACE;
 578
 579                                 /* Since we diddled both sets of attendees, we have to start
 580                                  * the iteration over again.  This will not create an infinite
 581                                  * loop because we removed the attendee from the reply.  (That's
 582                                  * why we cloned the reply, and that's what we mean by "ripping
 583                                  * its guts out.")
 584                                  */
 585                                 goto STARTOVER;
 586                         }
 587
 588                 }
 589         }
 590
 591         /* Free the *clone* of the reply. */
 592         icalcomponent_free(reply);
 593 }
 594
 595
 596
 597
 598 /*
 599  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 600  * calendar event.  The object has already been deserialized for us; all
 601  * we have to do here is hunt for the event in our calendar, merge in the
 602  * updated attendee status, and save it again.
 603  *
 604  * This function returns 0 on success, 1 if the event was not found in the
 605  * user's calendar, or 2 if an internal error occurred.
 606  */
 607 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 608         char uid[SIZ];
 609         char hold_rm[ROOMNAMELEN];
 610         long msgnum_being_replaced = 0;
 611         struct CtdlMessage *template = NULL;
 612         struct CtdlMessage *msg;
 613         struct original_event_container oec;
 614         icalcomponent *original_event;
 615         char *serialized_event = NULL;
 616         char roomname[ROOMNAMELEN];
 617         char *message_text = NULL;
 618
 619         /* Figure out just what event it is we're dealing with */
 620         strcpy(uid, "--==<< InVaLiD uId >>==--");
 621         ical_learn_uid_of_reply(uid, cal);
 622         lprintf(9, "UID of event being replied to is <%s>\n", uid);
 623
 624         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 625
 626         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 627                 getroom(&CC->quickroom, hold_rm);
 628                 lprintf(3, "cannot get user calendar room\n");
 629                 return(2);
 630         }
 631
 632         /*
 633          * Pound through the user's calendar looking for a message with
 634          * the Citadel EUID set to the value we're looking for.  Since
 635          * Citadel always sets the message EUID to the vCalendar UID of
 636          * the event, this will work.
 637          */
 638         template = (struct CtdlMessage *)
 639                 mallok(sizeof(struct CtdlMessage));
 640         memset(template, 0, sizeof(struct CtdlMessage));
 641         template->cm_fields['E'] = strdoop(uid);
 642         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 643                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 644         CtdlFreeMessage(template);
 645         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 646
 647         lprintf(9, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 648         if (msgnum_being_replaced == 0) {
 649                 return(1);                      /* no calendar event found */
 650         }
 651
 652         /* Now we know the ID of the message containing the event being updated.
 653          * We don't actually have to delete it; that'll get taken care of by the
 654          * server when we save another event with the same UID.  This just gives
 655          * us the ability to load the event into memory so we can diddle the
 656          * attendees.
 657          */
 658         msg = CtdlFetchMessage(msgnum_being_replaced);
 659         if (msg == NULL) {
 660                 return(2);                      /* internal error */
 661         }
 662         oec.c = NULL;
 663         mime_parser(msg->cm_fields['M'],
 664                 NULL,
 665                 *ical_locate_original_event,    /* callback function */
 666                 NULL, NULL,
 667                 &oec,                           /* user data */
 668                 0
 669         );
 670         CtdlFreeMessage(msg);
 671
 672         original_event = oec.c;
 673         if (original_event == NULL) {
 674                 lprintf(3, "ERROR: Original_component is NULL.\n");
 675                 return(2);
 676         }
 677
 678         /* Merge the attendee's updated status into the event */
 679         ical_merge_attendee_reply(original_event, cal);
 680
 681         /* Serialize it */
 682         serialized_event = strdoop(icalcomponent_as_ical_string(original_event));
 683         icalcomponent_free(original_event);     /* Don't need this anymore. */
 684         if (serialized_event == NULL) return(2);
 685
 686         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 687
 688         message_text = mallok(strlen(serialized_event) + SIZ);
 689         if (message_text != NULL) {
 690                 sprintf(message_text,
 691                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 692                         serialized_event
 693                 );
 694
 695                 msg = CtdlMakeMessage(&CC->usersupp,
 696                         "",                     /* No recipient */
 697                         roomname,
 698                         0, FMT_RFC822,
 699                         "",
 700                         "",             /* no subject */
 701                         message_text);
 702
 703                 if (msg != NULL) {
 704                         CIT_ICAL->avoid_sending_invitations = 1;
 705                         CtdlSubmitMsg(msg, NULL, roomname);
 706                         CtdlFreeMessage(msg);
 707                         CIT_ICAL->avoid_sending_invitations = 0;
 708                 }
 709         }
 710         phree(serialized_event);
 711         return(0);
 712 }
 713
 714
 715 /*
 716  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 717  * simply extracts the calendar object from the message, deserializes it, and
 718  * passes it up to ical_update_my_calendar_with_reply() for processing.
 719  */
 720 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 721         struct CtdlMessage *msg;
 722         struct ical_respond_data ird;
 723         int ret;
 724
 725         if (
 726            (strcasecmp(action, "update"))
 727            && (strcasecmp(action, "ignore"))
 728         ) {
 729                 cprintf("%d Action must be 'update' or 'ignore'\n",
 730                         ERROR + ILLEGAL_VALUE
 731                 );
 732                 return;
 733         }
 734
 735         msg = CtdlFetchMessage(msgnum);
 736         if (msg == NULL) {
 737                 cprintf("%d Message %ld not found.\n",
 738                         ERROR+ILLEGAL_VALUE,
 739                         (long)msgnum
 740                 );
 741                 return;
 742         }
 743
 744         memset(&ird, 0, sizeof ird);
 745         strcpy(ird.desired_partnum, partnum);
 746         mime_parser(msg->cm_fields['M'],
 747                 NULL,
 748                 *ical_locate_part,              /* callback function */
 749                 NULL, NULL,
 750                 (void *) &ird,                  /* user data */
 751                 0
 752         );
 753
 754         /* We're done with the incoming message, because we now have a
 755          * calendar object in memory.
 756          */
 757         CtdlFreeMessage(msg);
 758
 759         /*
 760          * Here is the real meat of this function.  Handle the event.
 761          */
 762         if (ird.cal != NULL) {
 763                 /* Update the user's calendar if necessary */
 764                 if (!strcasecmp(action, "update")) {
 765                         ret = ical_update_my_calendar_with_reply(ird.cal);
 766                         if (ret == 0) {
 767                                 cprintf("%d Your calendar has been updated with this reply.\n",
 768                                         CIT_OK);
 769                         }
 770                         else if (ret == 1) {
 771                                 cprintf("%d This event does not exist in your calendar.\n",
 772                                         ERROR + FILE_NOT_FOUND);
 773                         }
 774                         else {
 775                                 cprintf("%d An internal error occurred.\n",
 776                                         ERROR + INTERNAL_ERROR);
 777                         }
 778                 }
 779                 else {
 780                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 781                 }
 782
 783                 /* Now that we've processed this message, we don't need it
 784                  * anymore.  So delete it.  (Maybe make this optional?)
 785                  */
 786                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 787
 788                 /* Free the memory we allocated and return a response. */
 789                 icalcomponent_free(ird.cal);
 790                 ird.cal = NULL;
 791                 return;
 792         }
 793         else {
 794                 cprintf("%d No calendar object found\n", ERROR);
 795                 return;
 796         }
 797
 798         /* should never get here */
 799 }
 800
 801
 802 /*
 803  * Search for a property in both the top level and in a VEVENT subcomponent
 804  */
 805 icalproperty *ical_ctdl_get_subprop(
 806                 icalcomponent *cal,
 807                 icalproperty_kind which_prop
 808 ) {
 809         icalproperty *p;
 810         icalcomponent *c;
 811
 812         p = icalcomponent_get_first_property(cal, which_prop);
 813         if (p == NULL) {
 814                 c = icalcomponent_get_first_component(cal,
 815                                                         ICAL_VEVENT_COMPONENT);
 816                 if (c != NULL) {
 817                         p = icalcomponent_get_first_property(c, which_prop);
 818                 }
 819         }
 820         return p;
 821 }
 822
 823
 824 /*
 825  * Check to see if two events overlap.  Returns nonzero if they do.
 826  */
 827 int ical_ctdl_is_overlap(
 828                         struct icaltimetype t1start,
 829                         struct icaltimetype t1end,
 830                         struct icaltimetype t2start,
 831                         struct icaltimetype t2end
 832 ) {
 833
 834         if (icaltime_is_null_time(t1start)) return(0);
 835         if (icaltime_is_null_time(t2start)) return(0);
 836
 837         /* First, check for all-day events */
 838         if (t1start.is_date) {
 839                 if (!icaltime_compare_date_only(t1start, t2start)) {
 840                         return(1);
 841                 }
 842                 if (!icaltime_is_null_time(t2end)) {
 843                         if (!icaltime_compare_date_only(t1start, t2end)) {
 844                                 return(1);
 845                         }
 846                 }
 847         }
 848
 849         if (t2start.is_date) {
 850                 if (!icaltime_compare_date_only(t2start, t1start)) {
 851                         return(1);
 852                 }
 853                 if (!icaltime_is_null_time(t1end)) {
 854                         if (!icaltime_compare_date_only(t2start, t1end)) {
 855                                 return(1);
 856                         }
 857                 }
 858         }
 859
 860         /* Now check for overlaps using date *and* time. */
 861
 862         /* First, bail out if either event 1 or event 2 is missing end time. */
 863         if (icaltime_is_null_time(t1end)) return(0);
 864         if (icaltime_is_null_time(t2end)) return(0);
 865
 866         /* If event 1 ends before event 2 starts, we're in the clear. */
 867         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 868
 869         /* If event 2 ends before event 1 starts, we're also ok. */
 870         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 871
 872         /* Otherwise, they overlap. */
 873         return(1);
 874 }
 875
 876
 877
 878 /*
 879  * Backend for ical_hunt_for_conflicts()
 880  */
 881 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 882         icalcomponent *cal;
 883         struct CtdlMessage *msg;
 884         struct ical_respond_data ird;
 885         struct icaltimetype t1start, t1end, t2start, t2end;
 886         icalproperty *p;
 887         char conflict_event_uid[SIZ];
 888         char conflict_event_summary[SIZ];
 889         char compare_uid[SIZ];
 890
 891         cal = (icalcomponent *)data;
 892         strcpy(compare_uid, "");
 893         strcpy(conflict_event_uid, "");
 894         strcpy(conflict_event_summary, "");
 895
 896         msg = CtdlFetchMessage(msgnum);
 897         if (msg == NULL) return;
 898         memset(&ird, 0, sizeof ird);
 899         strcpy(ird.desired_partnum, "_HUNT_");
 900         mime_parser(msg->cm_fields['M'],
 901                 NULL,
 902                 *ical_locate_part,              /* callback function */
 903                 NULL, NULL,
 904                 (void *) &ird,                  /* user data */
 905                 0
 906         );
 907         CtdlFreeMessage(msg);
 908
 909         if (ird.cal == NULL) return;
 910
 911         t1start = icaltime_null_time();
 912         t1end = icaltime_null_time();
 913         t2start = icaltime_null_time();
 914         t1end = icaltime_null_time();
 915
 916         /* Now compare cal to ird.cal */
 917         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 918         if (p == NULL) return;
 919         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 920
 921         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 922         if (p != NULL) t2end = icalproperty_get_dtend(p);
 923
 924         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 925         if (p == NULL) return;
 926         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 927
 928         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 929         if (p != NULL) t1end = icalproperty_get_dtend(p);
 930
 931         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 932         if (p != NULL) {
 933                 strcpy(compare_uid, icalproperty_get_comment(p));
 934         }
 935
 936         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 937         if (p != NULL) {
 938                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 939         }
 940
 941         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 942         if (p != NULL) {
 943                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 944         }
 945
 946         icalcomponent_free(ird.cal);
 947
 948         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 949                 cprintf("%ld||%s|%s|%d|\n",
 950                         msgnum,
 951                         conflict_event_uid,
 952                         conflict_event_summary,
 953                         (       ((strlen(compare_uid)>0)
 954                                 &&(!strcasecmp(compare_uid,
 955                                 conflict_event_uid))) ? 1 : 0
 956                         )
 957                 );
 958         }
 959 }
 960
 961
 962
 963 /*
 964  * Phase 2 of "hunt for conflicts" operation.
 965  * At this point we have a calendar object which represents the VEVENT that
 966  * we're considering adding to the calendar.  Now hunt through the user's
 967  * calendar room, and output zero or more existing VEVENTs which conflict
 968  * with this one.
 969  */
 970 void ical_hunt_for_conflicts(icalcomponent *cal) {
 971         char hold_rm[ROOMNAMELEN];
 972
 973         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 974
 975         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 976                 getroom(&CC->quickroom, hold_rm);
 977                 cprintf("%d You do not have a calendar.\n", ERROR);
 978                 return;
 979         }
 980
 981         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 982
 983         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 984                 NULL,
 985                 ical_hunt_for_conflicts_backend,
 986                 (void *) cal
 987         );
 988
 989         cprintf("000\n");
 990         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 991
 992 }
 993
 994
 995
 996 /*
 997  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 998  */
 999 void ical_conflicts(long msgnum, char *partnum) {
1000         struct CtdlMessage *msg;
1001         struct ical_respond_data ird;
1002
1003         msg = CtdlFetchMessage(msgnum);
1004         if (msg == NULL) {
1005                 cprintf("%d Message %ld not found.\n",
1006                         ERROR+ILLEGAL_VALUE,
1007                         (long)msgnum
1008                 );
1009                 return;
1010         }
1011
1012         memset(&ird, 0, sizeof ird);
1013         strcpy(ird.desired_partnum, partnum);
1014         mime_parser(msg->cm_fields['M'],
1015                 NULL,
1016                 *ical_locate_part,              /* callback function */
1017                 NULL, NULL,
1018                 (void *) &ird,                  /* user data */
1019                 0
1020         );
1021
1022         CtdlFreeMessage(msg);
1023
1024         if (ird.cal != NULL) {
1025                 ical_hunt_for_conflicts(ird.cal);
1026                 icalcomponent_free(ird.cal);
1027                 return;
1028         }
1029         else {
1030                 cprintf("%d No calendar object found\n", ERROR);
1031                 return;
1032         }
1033
1034         /* should never get here */
1035 }
1036
1037
1038
1039 /*
1040  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1041  */
1042 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1043         icalproperty *p;
1044         icalvalue *v;
1045         struct icalperiodtype my_period;
1046
1047         if (cal == NULL) return;
1048         my_period = icalperiodtype_null_period();
1049
1050         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1051                 ical_add_to_freebusy(fb,
1052                         icalcomponent_get_first_component(
1053                                 cal, ICAL_VEVENT_COMPONENT
1054                         )
1055                 );
1056                 return;
1057         }
1058
1059         ical_dezonify(cal);
1060
1061         /* If this event is not opaque, the user isn't publishing it as
1062          * busy time, so don't bother doing anything else.
1063          */
1064         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1065         if (p != NULL) {
1066                 v = icalproperty_get_value(p);
1067                 if (v != NULL) {
1068                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1069                                 return;
1070                         }
1071                 }
1072         }
1073
1074         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1075         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1076         if (p != NULL) {
1077                 my_period.start = icalproperty_get_dtstart(p);
1078         }
1079
1080         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1081         if (p != NULL) {
1082                 my_period.end = icalproperty_get_dtstart(p);
1083         }
1084
1085         /* Now add it. */
1086         icalcomponent_add_property(fb,
1087                 icalproperty_new_freebusy(my_period)
1088         );
1089
1090 }
1091
1092
1093
1094 /*
1095  * Backend for ical_freebusy()
1096  *
1097  * This function simply loads the messages in the user's calendar room,
1098  * which contain VEVENTs, then strips them of all non-freebusy data, and
1099  * adds them to the supplied VCALENDAR.
1100  *
1101  */
1102 void ical_freebusy_backend(long msgnum, void *data) {
1103         icalcomponent *cal;
1104         struct CtdlMessage *msg;
1105         struct ical_respond_data ird;
1106
1107         cal = (icalcomponent *)data;
1108
1109         msg = CtdlFetchMessage(msgnum);
1110         if (msg == NULL) return;
1111         memset(&ird, 0, sizeof ird);
1112         strcpy(ird.desired_partnum, "_HUNT_");
1113         mime_parser(msg->cm_fields['M'],
1114                 NULL,
1115                 *ical_locate_part,              /* callback function */
1116                 NULL, NULL,
1117                 (void *) &ird,                  /* user data */
1118                 0
1119         );
1120         CtdlFreeMessage(msg);
1121
1122         if (ird.cal == NULL) return;
1123
1124         ical_add_to_freebusy(cal, ird.cal);
1125
1126         /* Now free the memory. */
1127         icalcomponent_free(ird.cal);
1128 }
1129
1130
1131
1132 /*
1133  * Grab another user's free/busy times
1134  */
1135 void ical_freebusy(char *who) {
1136         struct usersupp usbuf;
1137         char calendar_room_name[ROOMNAMELEN];
1138         char hold_rm[ROOMNAMELEN];
1139         char *serialized_request = NULL;
1140         icalcomponent *encaps = NULL;
1141         icalcomponent *fb = NULL;
1142
1143         if (getuser(&usbuf, who) != 0) {
1144                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1145                 return;
1146         }
1147
1148         MailboxName(calendar_room_name, sizeof calendar_room_name,
1149                 &usbuf, USERCALENDARROOM);
1150
1151         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
1152
1153         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
1154                 cprintf("%d Cannot open calendar\n", ERROR+ROOM_NOT_FOUND);
1155                 getroom(&CC->quickroom, hold_rm);
1156                 return;
1157         }
1158
1159         /* Create a VFREEBUSY subcomponent */
1160         lprintf(9, "Creating VFREEBUSY component\n");
1161         fb = icalcomponent_new_vfreebusy();
1162         if (fb == NULL) {
1163                 cprintf("%d Internal error: cannot allocate memory.\n",
1164                         ERROR+INTERNAL_ERROR);
1165                 icalcomponent_free(encaps);
1166                 getroom(&CC->quickroom, hold_rm);
1167                 return;
1168         }
1169
1170         lprintf(9, "Adding busy time from events\n");
1171         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
1172                 NULL, ical_freebusy_backend, (void *)fb
1173         );
1174
1175         lprintf(9, "Before encapsulation:\n---------\n%s\n----------\n",
1176                 icalcomponent_as_ical_string(fb));
1177
1178         /* Put the freebusy component into the calendar component */
1179         lprintf(9, "Encapsulating\n");
1180         encaps = ical_encapsulate_subcomponent(fb);
1181         if (encaps == NULL) {
1182                 icalcomponent_free(fb);
1183                 cprintf("%d Internal error: cannot allocate memory.\n",
1184                         ERROR+INTERNAL_ERROR);
1185                 getroom(&CC->quickroom, hold_rm);
1186                 return;
1187         }
1188
1189         /* Set the method to PUBLISH */
1190         lprintf(9, "Setting method\n");
1191         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1192
1193         /* Serialize it */
1194         lprintf(9, "Serializing\n");
1195         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1196         icalcomponent_free(encaps);     /* Don't need this anymore. */
1197
1198         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1199         if (serialized_request != NULL) {
1200                 client_write(serialized_request, strlen(serialized_request));
1201                 phree(serialized_request);
1202         }
1203         cprintf("\n000\n");
1204
1205         /* Go back to the room from which we came... */
1206         getroom(&CC->quickroom, hold_rm);
1207 }
1208
1209
1210
1211
1212 /*
1213  * All Citadel calendar commands from the client come through here.
1214  */
1215 void cmd_ical(char *argbuf)
1216 {
1217         char subcmd[SIZ];
1218         long msgnum;
1219         char partnum[SIZ];
1220         char action[SIZ];
1221         char who[SIZ];
1222
1223         if (CtdlAccessCheck(ac_logged_in)) return;
1224
1225         extract(subcmd, argbuf, 0);
1226
1227         if (!strcmp(subcmd, "test")) {
1228                 cprintf("%d This server supports calendaring\n", CIT_OK);
1229                 return;
1230         }
1231
1232         else if (!strcmp(subcmd, "respond")) {
1233                 msgnum = extract_long(argbuf, 1);
1234                 extract(partnum, argbuf, 2);
1235                 extract(action, argbuf, 3);
1236                 ical_respond(msgnum, partnum, action);
1237         }
1238
1239         else if (!strcmp(subcmd, "handle_rsvp")) {
1240                 msgnum = extract_long(argbuf, 1);
1241                 extract(partnum, argbuf, 2);
1242                 extract(action, argbuf, 3);
1243                 ical_handle_rsvp(msgnum, partnum, action);
1244         }
1245
1246         else if (!strcmp(subcmd, "conflicts")) {
1247                 msgnum = extract_long(argbuf, 1);
1248                 extract(partnum, argbuf, 2);
1249                 ical_conflicts(msgnum, partnum);
1250         }
1251
1252         else if (!strcmp(subcmd, "freebusy")) {
1253                 extract(who, argbuf, 1);
1254                 ical_freebusy(who);
1255         }
1256
1257         else {
1258                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
1259                 return;
1260         }
1261
1262         /* should never get here */
1263 }
1264
1265
1266
1267 /*
1268  * We don't know if the calendar room exists so we just create it at login
1269  */
1270 void ical_create_room(void)
1271 {
1272         struct quickroom qr;
1273         struct visit vbuf;
1274
1275         /* Create the calendar room if it doesn't already exist */
1276         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
1277
1278         /* Set expiration policy to manual; otherwise objects will be lost! */
1279         if (lgetroom(&qr, USERCALENDARROOM)) {
1280                 lprintf(3, "Couldn't get the user calendar room!\n");
1281                 return;
1282         }
1283         qr.QRep.expire_mode = EXPIRE_MANUAL;
1284         qr.QRdefaultview = 3;   /* 3 = calendar view */
1285         lputroom(&qr);
1286
1287         /* Set the view to a calendar view */
1288         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1289         vbuf.v_view = 3;        /* 3 = calendar */
1290         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1291
1292         /* Create the tasks list room if it doesn't already exist */
1293         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
1294
1295         /* Set expiration policy to manual; otherwise objects will be lost! */
1296         if (lgetroom(&qr, USERTASKSROOM)) {
1297                 lprintf(3, "Couldn't get the user calendar room!\n");
1298                 return;
1299         }
1300         qr.QRep.expire_mode = EXPIRE_MANUAL;
1301         qr.QRdefaultview = 4;   /* 4 = tasks view */
1302         lputroom(&qr);
1303
1304         /* Set the view to a task list view */
1305         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1306         vbuf.v_view = 4;        /* 4 = tasks */
1307         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1308
1309         return;
1310 }
1311
1312
1313 /*
1314  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1315  * finds a VEVENT.
1316  */
1317 void ical_send_out_invitations(icalcomponent *cal) {
1318         icalcomponent *the_request = NULL;
1319         char *serialized_request = NULL;
1320         icalcomponent *encaps = NULL;
1321         char *request_message_text = NULL;
1322         struct CtdlMessage *msg = NULL;
1323         struct recptypes *valid = NULL;
1324         char attendees_string[SIZ];
1325         int num_attendees = 0;
1326         char this_attendee[SIZ];
1327         icalproperty *attendee = NULL;
1328         char summary_string[SIZ];
1329         icalproperty *summary = NULL;
1330
1331         if (cal == NULL) {
1332                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
1333                 return;
1334         }
1335
1336
1337         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1338         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1339                 ical_send_out_invitations(
1340                         icalcomponent_get_first_component(
1341                                 cal, ICAL_VEVENT_COMPONENT
1342                         )
1343                 );
1344                 return;
1345         }
1346
1347         /* Clone the event */
1348         the_request = icalcomponent_new_clone(cal);
1349         if (the_request == NULL) {
1350                 lprintf(3, "ERROR: cannot clone calendar object\n");
1351                 return;
1352         }
1353
1354         /* Extract the summary string -- we'll use it as the
1355          * message subject for the request
1356          */
1357         strcpy(summary_string, "Meeting request");
1358         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1359         if (summary != NULL) {
1360                 if (icalproperty_get_summary(summary)) {
1361                         strcpy(summary_string,
1362                                 icalproperty_get_summary(summary) );
1363                 }
1364         }
1365
1366         /* Determine who the recipients of this message are (the attendees) */
1367         strcpy(attendees_string, "");
1368         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1369                 if (icalproperty_get_attendee(attendee)) {
1370                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1371                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1372                                 strcpy(this_attendee, &this_attendee[7]);
1373                                 snprintf(&attendees_string[strlen(attendees_string)],
1374                                         sizeof(attendees_string) - strlen(attendees_string),
1375                                         "%s, ",
1376                                         this_attendee
1377                                 );
1378                                 ++num_attendees;
1379                         }
1380                 }
1381         }
1382
1383         lprintf(9, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1384
1385         /* If there are no attendees, there are no invitations to send, so...
1386          * don't bother putting one together!  Punch out, Maverick!
1387          */
1388         if (num_attendees == 0) {
1389                 icalcomponent_free(the_request);
1390                 return;
1391         }
1392
1393         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1394         encaps = icalcomponent_new_vcalendar();
1395         if (encaps == NULL) {
1396                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
1397                         __FILE__, __LINE__);
1398                 icalcomponent_free(the_request);
1399                 return;
1400         }
1401
1402         /* Set the Product ID */
1403         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1404
1405         /* Set the Version Number */
1406         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1407
1408         /* Set the method to REQUEST */
1409         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1410
1411         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1412         ical_dezonify(the_request);
1413
1414         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1415          * are responsible for "the_request"'s memory -- it will be freed
1416          * when we free "encaps".
1417          */
1418         icalcomponent_add_component(encaps, the_request);
1419
1420         /* Serialize it */
1421         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1422         icalcomponent_free(encaps);     /* Don't need this anymore. */
1423         if (serialized_request == NULL) return;
1424
1425         request_message_text = mallok(strlen(serialized_request) + SIZ);
1426         if (request_message_text != NULL) {
1427                 sprintf(request_message_text,
1428                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1429                         serialized_request
1430                 );
1431
1432                 msg = CtdlMakeMessage(&CC->usersupp,
1433                         "",                     /* No single recipient here */
1434                         CC->quickroom.QRname, 0, FMT_RFC822,
1435                         "",
1436                         summary_string,         /* Use summary for subject */
1437                         request_message_text);
1438
1439                 if (msg != NULL) {
1440                         valid = validate_recipients(attendees_string);
1441                         CtdlSubmitMsg(msg, valid, "");
1442                         CtdlFreeMessage(msg);
1443                 }
1444         }
1445         phree(serialized_request);
1446 }
1447
1448
1449 /*
1450  * When a calendar object is being saved, determine whether it's a VEVENT
1451  * and the user saving it is the organizer.  If so, send out invitations
1452  * to any listed attendees.
1453  *
1454  */
1455 void ical_saving_vevent(icalcomponent *cal) {
1456         icalcomponent *c;
1457         icalproperty *organizer = NULL;
1458         char organizer_string[SIZ];
1459
1460         /* Don't send out invitations if we've been asked not to. */
1461         lprintf(9, "CIT_ICAL->avoid_sending_invitations = %d\n",
1462                 CIT_ICAL->avoid_sending_invitations);
1463         if (CIT_ICAL->avoid_sending_invitations > 0) {
1464                 return;
1465         }
1466
1467         strcpy(organizer_string, "");
1468         /*
1469          * The VEVENT subcomponent is the one we're interested in.
1470          * Send out invitations if, and only if, this user is the Organizer.
1471          */
1472         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1473                 organizer = icalcomponent_get_first_property(cal,
1474                                                 ICAL_ORGANIZER_PROPERTY);
1475                 if (organizer != NULL) {
1476                         if (icalproperty_get_organizer(organizer)) {
1477                                 strcpy(organizer_string,
1478                                         icalproperty_get_organizer(organizer));
1479                         }
1480                 }
1481                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1482                         strcpy(organizer_string, &organizer_string[7]);
1483                         striplt(organizer_string);
1484                         /*
1485                          * If the user saving the event is listed as the
1486                          * organizer, then send out invitations.
1487                          */
1488                         if (CtdlIsMe(organizer_string)) {
1489                                 ical_send_out_invitations(cal);
1490                         }
1491                 }
1492         }
1493
1494         /* If the component has subcomponents, recurse through them. */
1495         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1496             (c != NULL);
1497             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1498                 /* Recursively process subcomponent */
1499                 ical_saving_vevent(c);
1500         }
1501
1502 }
1503
1504
1505
1506 /*
1507  * Back end for ical_obj_beforesave()
1508  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1509  * the summary of the event (becomes message subject),
1510  * and the start time (becomes message date/time).
1511  */
1512 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1513                 char *disp, void *content, char *cbtype, size_t length,
1514                 char *encoding, void *cbuserdata)
1515 {
1516         icalcomponent *cal;
1517         icalproperty *p;
1518         struct icalmessagemod *imm;
1519
1520         imm = (struct icalmessagemod *)cbuserdata;
1521
1522         /* If this is a text/calendar object, hunt for the UID and drop it in
1523          * the "user data" pointer for the MIME parser.  When
1524          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1525          * to that string.
1526          */
1527         if (!strcasecmp(cbtype, "text/calendar")) {
1528                 cal = icalcomponent_new_from_string(content);
1529                 if (cal != NULL) {
1530                         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1531                                 cal = icalcomponent_get_first_component(
1532                                         cal, ICAL_VEVENT_COMPONENT
1533                                 );
1534                         }
1535                 }
1536                 if (cal != NULL) {
1537                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1538                         if (p != NULL) {
1539                                 strcpy(imm->uid, icalproperty_get_comment(p));
1540                         }
1541                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1542                         if (p != NULL) {
1543                                 strcpy(imm->subject,
1544                                                 icalproperty_get_comment(p));
1545                         }
1546                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1547                         if (p != NULL) {
1548                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1549                         }
1550                         icalcomponent_free(cal);
1551                 }
1552         }
1553 }
1554
1555
1556
1557
1558
1559 /*
1560  * See if we need to prevent the object from being saved (we don't allow
1561  * MIME types other than text/calendar in the Calendar> room).  Also, when
1562  * saving an event to the calendar, set the message's Citadel extended message
1563  * ID to the UID of the object.  This causes our replication checker to
1564  * automatically delete any existing instances of the same object.  (Isn't
1565  * that cool?)
1566  *
1567  * We also set the message's Subject to the event summary, and the Date/time to
1568  * the event start time.
1569  */
1570 int ical_obj_beforesave(struct CtdlMessage *msg)
1571 {
1572         char roomname[ROOMNAMELEN];
1573         char *p;
1574         int a;
1575         struct icalmessagemod imm;
1576
1577         /*
1578          * Only messages with content-type text/calendar
1579          * may be saved to Calendar>.  If the message is bound for
1580          * Calendar> but doesn't have this content-type, throw an error
1581          * so that the message may not be posted.
1582          */
1583
1584         /* First determine if this is our room */
1585         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1586         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1587                 return 0;       /* It's not the Calendar room. */
1588         }
1589
1590         /* Then determine content-type of the message */
1591
1592         /* It must be an RFC822 message! */
1593         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1594         if (msg->cm_format_type != 4)
1595                 return 1;       /* You tried to save a non-RFC822 message! */
1596
1597         /* Find the Content-Type: header */
1598         p = msg->cm_fields['M'];
1599         a = strlen(p);
1600         while (--a > 0) {
1601                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1602                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1603                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1604                                 mime_parser(msg->cm_fields['M'],
1605                                         NULL,
1606                                         *ical_ctdl_set_extended_msgid,
1607                                         NULL, NULL,
1608                                         (void *)&imm,
1609                                         0
1610                                 );
1611                                 if (strlen(imm.uid) > 0) {
1612                                         if (msg->cm_fields['E'] != NULL) {
1613                                                 phree(msg->cm_fields['E']);
1614                                         }
1615                                         msg->cm_fields['E'] = strdoop(imm.uid);
1616                                 }
1617                                 if (strlen(imm.subject) > 0) {
1618                                         if (msg->cm_fields['U'] != NULL) {
1619                                                 phree(msg->cm_fields['U']);
1620                                         }
1621                                         msg->cm_fields['U'] = strdoop(imm.subject);
1622                                 }
1623                                 if (imm.dtstart > 0) {
1624                                         if (msg->cm_fields['T'] != NULL) {
1625                                                 phree(msg->cm_fields['T']);
1626                                         }
1627                                         msg->cm_fields['T'] = strdoop("000000000000000000");
1628                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1629                                 }
1630                                 return 0;
1631                         }
1632                         else {
1633                                 return 1;
1634                         }
1635                 }
1636                 p++;
1637         }
1638
1639         /* Oops!  No Content-Type in this message!  How'd that happen? */
1640         lprintf(7, "RFC822 message with no Content-Type header!\n");
1641         return 1;
1642 }
1643
1644
1645 /*
1646  * Things we need to do after saving a calendar event.
1647  */
1648 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1649                 char *disp, void *content, char *cbtype, size_t length,
1650                 char *encoding, void *cbuserdata)
1651 {
1652         icalcomponent *cal;
1653
1654         /* If this is a text/calendar object, hunt for the UID and drop it in
1655          * the "user data" pointer for the MIME parser.  When
1656          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1657          * to that string.
1658          */
1659         if (!strcasecmp(cbtype, "text/calendar")) {
1660                 cal = icalcomponent_new_from_string(content);
1661                 if (cal != NULL) {
1662                         ical_saving_vevent(cal);
1663                         icalcomponent_free(cal);
1664                 }
1665         }
1666 }
1667
1668
1669 /*
1670  * Things we need to do after saving a calendar event.
1671  */
1672 int ical_obj_aftersave(struct CtdlMessage *msg)
1673 {
1674         char roomname[ROOMNAMELEN];
1675         char *p;
1676         int a;
1677
1678         /*
1679          * If this isn't the Calendar> room, no further action is necessary.
1680          */
1681
1682         /* First determine if this is our room */
1683         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1684         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1685                 return 0;       /* It's not the Calendar room. */
1686         }
1687
1688         /* Then determine content-type of the message */
1689
1690         /* It must be an RFC822 message! */
1691         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1692         if (msg->cm_format_type != 4) return(1);
1693
1694         /* Find the Content-Type: header */
1695         p = msg->cm_fields['M'];
1696         a = strlen(p);
1697         while (--a > 0) {
1698                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1699                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1700                                 mime_parser(msg->cm_fields['M'],
1701                                         NULL,
1702                                         *ical_obj_aftersave_backend,
1703                                         NULL, NULL,
1704                                         NULL,
1705                                         0
1706                                 );
1707                                 return 0;
1708                         }
1709                         else {
1710                                 return 1;
1711                         }
1712                 }
1713                 p++;
1714         }
1715
1716         /* Oops!  No Content-Type in this message!  How'd that happen? */
1717         lprintf(7, "RFC822 message with no Content-Type header!\n");
1718         return 1;
1719 }
1720
1721
1722 void ical_session_startup(void) {
1723         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1724         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1725 }
1726
1727
1728 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
1729
1730 /*
1731  * Register this module with the Citadel server.
1732  */
1733 char *serv_calendar_init(void)
1734 {
1735 #ifdef CITADEL_WITH_CALENDAR_SERVICE
1736         SYM_CIT_ICAL = CtdlGetDynamicSymbol();
1737         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1738         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1739         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1740         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1741         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1742 #endif
1743         return "$Id$";
1744 }