citadel/serv_calendar.c

   1 /*
   2  * $Id$
   3  *
   4  * This module implements iCalendar object processing and the Calendar>
   5  * room on a Citadel 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 <stdlib.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <limits.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #ifdef HAVE_STRINGS_H
  20 #include <strings.h>
  21 #endif
  22 #include "citadel.h"
  23 #include "server.h"
  24 #include "citserver.h"
  25 #include "sysdep_decls.h"
  26 #include "support.h"
  27 #include "config.h"
  28 #include "serv_extensions.h"
  29 #include "user_ops.h"
  30 #include "room_ops.h"
  31 #include "tools.h"
  32 #include "msgbase.h"
  33 #include "mime_parser.h"
  34 #include "internet_addressing.h"
  35 #include "serv_calendar.h"
  36 #include "euidindex.h"
  37
  38 #ifdef CITADEL_WITH_CALENDAR_SERVICE
  39
  40 #include <ical.h>
  41 #include "ical_dezonify.h"
  42
  43 struct ical_respond_data {
  44         char desired_partnum[SIZ];
  45         icalcomponent *cal;
  46 };
  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(CTDL_CRIT, "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         return(encaps);
  70 }
  71
  72
  73 /*
  74  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  75  */
  76 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  77         icalcomponent *encaps;
  78
  79         /* If we're already looking at a full VCALENDAR component,
  80          * don't bother ... just return itself.
  81          */
  82         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  83                 return subcomp;
  84         }
  85
  86         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  87         encaps = icalcomponent_new_citadel_vcalendar();
  88         if (encaps == NULL) return NULL;
  89
  90         /* Encapsulate the subcomponent inside */
  91         icalcomponent_add_component(encaps, subcomp);
  92
  93         /* Convert all timestamps to UTC so we don't have to deal with
  94          * stupid VTIMEZONE crap.
  95          */
  96         ical_dezonify(encaps);
  97
  98         /* Return the object we just created. */
  99         return(encaps);
 100 }
 101
 102
 103
 104
 105 /*
 106  * Write a calendar object into the specified user's calendar room.
 107  */
 108 void ical_write_to_cal(struct ctdluser *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         CtdlMakeTempFileName(temp, sizeof temp);
 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->user, 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" or "tentative".
 186  *
 187  */
 188 void ical_send_a_reply(icalcomponent *request, char *action) {
 189         icalcomponent *the_reply = NULL;
 190         icalcomponent *vevent = NULL;
 191         icalproperty *attendee = NULL;
 192         char attendee_string[SIZ];
 193         icalproperty *organizer = NULL;
 194         char organizer_string[SIZ];
 195         icalproperty *summary = NULL;
 196         char summary_string[SIZ];
 197         icalproperty *me_attend = NULL;
 198         struct recptypes *recp = NULL;
 199         icalparameter *partstat = NULL;
 200         char *serialized_reply = NULL;
 201         char *reply_message_text = NULL;
 202         struct CtdlMessage *msg = NULL;
 203         struct recptypes *valid = NULL;
 204
 205         strcpy(organizer_string, "");
 206         strcpy(summary_string, "Calendar item");
 207
 208         if (request == NULL) {
 209                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
 210                 return;
 211         }
 212
 213         the_reply = icalcomponent_new_clone(request);
 214         if (the_reply == NULL) {
 215                 lprintf(CTDL_ERR, "ERROR: cannot clone request\n");
 216                 return;
 217         }
 218
 219         /* Change the method from REQUEST to REPLY */
 220         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 221
 222         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 223         if (vevent != NULL) {
 224                 /* Hunt for attendees, removing ones that aren't us.
 225                  * (Actually, remove them all, cloning our own one so we can
 226                  * re-insert it later)
 227                  */
 228                 while (attendee = icalcomponent_get_first_property(vevent,
 229                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 230                 ) {
 231                         if (icalproperty_get_attendee(attendee)) {
 232                                 strcpy(attendee_string,
 233                                         icalproperty_get_attendee(attendee) );
 234                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 235                                         strcpy(attendee_string, &attendee_string[7]);
 236                                         striplt(attendee_string);
 237                                         recp = validate_recipients(attendee_string);
 238                                         if (recp != NULL) {
 239                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 240                                                         if (me_attend) icalproperty_free(me_attend);
 241                                                         me_attend = icalproperty_new_clone(attendee);
 242                                                 }
 243                                                 free(recp);
 244                                         }
 245                                 }
 246                         }
 247                         /* Remove it... */
 248                         icalcomponent_remove_property(vevent, attendee);
 249                         icalproperty_free(attendee);
 250                 }
 251
 252                 /* We found our own address in the attendee list. */
 253                 if (me_attend) {
 254                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 255                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 256
 257                         if (!strcasecmp(action, "accept")) {
 258                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 259                         }
 260                         else if (!strcasecmp(action, "decline")) {
 261                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 262                         }
 263                         else if (!strcasecmp(action, "tentative")) {
 264                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 265                         }
 266
 267                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 268
 269                         /* Now insert it back into the vevent. */
 270                         icalcomponent_add_property(vevent, me_attend);
 271                 }
 272
 273                 /* Figure out who to send this thing to */
 274                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 275                 if (organizer != NULL) {
 276                         if (icalproperty_get_organizer(organizer)) {
 277                                 strcpy(organizer_string,
 278                                         icalproperty_get_organizer(organizer) );
 279                         }
 280                 }
 281                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 282                         strcpy(organizer_string, &organizer_string[7]);
 283                         striplt(organizer_string);
 284                 } else {
 285                         strcpy(organizer_string, "");
 286                 }
 287
 288                 /* Extract the summary string -- we'll use it as the
 289                  * message subject for the reply
 290                  */
 291                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 292                 if (summary != NULL) {
 293                         if (icalproperty_get_summary(summary)) {
 294                                 strcpy(summary_string,
 295                                         icalproperty_get_summary(summary) );
 296                         }
 297                 }
 298         }
 299
 300         /* Now generate the reply message and send it out. */
 301         serialized_reply = strdup(icalcomponent_as_ical_string(the_reply));
 302         icalcomponent_free(the_reply);  /* don't need this anymore */
 303         if (serialized_reply == NULL) return;
 304
 305         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 306         if (reply_message_text != NULL) {
 307                 sprintf(reply_message_text,
 308                         "Content-type: text/calendar charset=\"utf-8\"\r\n\r\n%s\r\n",
 309                         serialized_reply
 310                 );
 311
 312                 msg = CtdlMakeMessage(&CC->user,
 313                         organizer_string,       /* to */
 314                         "",                     /* cc */
 315                         CC->room.QRname, 0, FMT_RFC822,
 316                         "",
 317                         summary_string,         /* Use summary for subject */
 318                         NULL,
 319                         reply_message_text);
 320
 321                 if (msg != NULL) {
 322                         valid = validate_recipients(organizer_string);
 323                         CtdlSubmitMsg(msg, valid, "");
 324                         CtdlFreeMessage(msg);
 325                 }
 326         }
 327         free(serialized_reply);
 328 }
 329
 330
 331
 332 /*
 333  * Callback function for mime parser that hunts for calendar content types
 334  * and turns them into calendar objects
 335  */
 336 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 337                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 338                 void *cbuserdata) {
 339
 340         struct ical_respond_data *ird = NULL;
 341
 342         ird = (struct ical_respond_data *) cbuserdata;
 343
 344         /* desired_partnum can be set to "_HUNT_" to have it just look for
 345          * the first part with a content type of text/calendar.  Otherwise
 346          * we have to only process the right one.
 347          */
 348         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 349                 if (strcasecmp(partnum, ird->desired_partnum)) {
 350                         return;
 351                 }
 352         }
 353
 354         if (strcasecmp(cbtype, "text/calendar")) {
 355                 return;
 356         }
 357
 358         if (ird->cal != NULL) {
 359                 icalcomponent_free(ird->cal);
 360                 ird->cal = NULL;
 361         }
 362
 363         ird->cal = icalcomponent_new_from_string(content);
 364         if (ird->cal != NULL) {
 365                 ical_dezonify(ird->cal);
 366         }
 367 }
 368
 369
 370 /*
 371  * Respond to a meeting request.
 372  */
 373 void ical_respond(long msgnum, char *partnum, char *action) {
 374         struct CtdlMessage *msg = NULL;
 375         struct ical_respond_data ird;
 376
 377         if (
 378            (strcasecmp(action, "accept"))
 379            && (strcasecmp(action, "decline"))
 380         ) {
 381                 cprintf("%d Action must be 'accept' or 'decline'\n",
 382                         ERROR + ILLEGAL_VALUE
 383                 );
 384                 return;
 385         }
 386
 387         msg = CtdlFetchMessage(msgnum, 1);
 388         if (msg == NULL) {
 389                 cprintf("%d Message %ld not found.\n",
 390                         ERROR + ILLEGAL_VALUE,
 391                         (long)msgnum
 392                 );
 393                 return;
 394         }
 395
 396         memset(&ird, 0, sizeof ird);
 397         strcpy(ird.desired_partnum, partnum);
 398         mime_parser(msg->cm_fields['M'],
 399                 NULL,
 400                 *ical_locate_part,              /* callback function */
 401                 NULL, NULL,
 402                 (void *) &ird,                  /* user data */
 403                 0
 404         );
 405
 406         /* We're done with the incoming message, because we now have a
 407          * calendar object in memory.
 408          */
 409         CtdlFreeMessage(msg);
 410
 411         /*
 412          * Here is the real meat of this function.  Handle the event.
 413          */
 414         if (ird.cal != NULL) {
 415                 /* Save this in the user's calendar if necessary */
 416                 if (!strcasecmp(action, "accept")) {
 417                         ical_add(ird.cal, 0);
 418                 }
 419
 420                 /* Send a reply if necessary */
 421                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 422                         ical_send_a_reply(ird.cal, action);
 423                 }
 424
 425                 /* Now that we've processed this message, we don't need it
 426                  * anymore.  So delete it.
 427                  */
 428                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 429
 430                 /* Free the memory we allocated and return a response. */
 431                 icalcomponent_free(ird.cal);
 432                 ird.cal = NULL;
 433                 cprintf("%d ok\n", CIT_OK);
 434                 return;
 435         }
 436         else {
 437                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 438                 return;
 439         }
 440
 441         /* should never get here */
 442 }
 443
 444
 445 /*
 446  * Figure out the UID of the calendar event being referred to in a
 447  * REPLY object.  This function is recursive.
 448  */
 449 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 450         icalcomponent *subcomponent;
 451         icalproperty *p;
 452
 453         /* If this object is a REPLY, then extract the UID. */
 454         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 455                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 456                 if (p != NULL) {
 457                         strcpy(uidbuf, icalproperty_get_comment(p));
 458                 }
 459         }
 460
 461         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 462          * UID of the reply; we want the UID of the invitation being replied to.
 463          */
 464         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 465             subcomponent != NULL;
 466             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 467                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 468         }
 469 }
 470
 471
 472 /*
 473  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 474  * locate the message containing the calendar event we're replying to, this function
 475  * gets called.  It basically just sticks the message number in a supplied buffer.
 476  */
 477 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 478         long *msgnumptr;
 479
 480         msgnumptr = (long *) data;
 481         *msgnumptr = msgnum;
 482 }
 483
 484
 485 struct original_event_container {
 486         icalcomponent *c;
 487 };
 488
 489 /*
 490  * Callback function for mime parser that hunts for calendar content types
 491  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 492  * to fetch the object being updated)
 493  */
 494 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 495                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 496                 void *cbuserdata) {
 497
 498         struct original_event_container *oec = NULL;
 499
 500         if (strcasecmp(cbtype, "text/calendar")) {
 501                 return;
 502         }
 503         oec = (struct original_event_container *) cbuserdata;
 504         if (oec->c != NULL) {
 505                 icalcomponent_free(oec->c);
 506         }
 507         oec->c = icalcomponent_new_from_string(content);
 508 }
 509
 510
 511 /*
 512  * Merge updated attendee information from a REPLY into an existing event.
 513  */
 514 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 515         icalcomponent *c;
 516         icalproperty *e_attendee, *r_attendee;
 517
 518         /* First things first.  If we're not looking at a VEVENT component,
 519          * recurse through subcomponents until we find one.
 520          */
 521         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 522                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 523                     c != NULL;
 524                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 525                         ical_merge_attendee_reply(c, reply);
 526                 }
 527                 return;
 528         }
 529
 530         /* Now do the same thing with the reply.
 531          */
 532         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 533                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 534                     c != NULL;
 535                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 536                         ical_merge_attendee_reply(event, c);
 537                 }
 538                 return;
 539         }
 540
 541         /* Clone the reply, because we're going to rip its guts out. */
 542         reply = icalcomponent_new_clone(reply);
 543
 544         /* At this point we're looking at the correct subcomponents.
 545          * Iterate through the attendees looking for a match.
 546          */
 547 STARTOVER:
 548         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 549             e_attendee != NULL;
 550             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 551
 552                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 553                     r_attendee != NULL;
 554                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 555
 556                         /* Check to see if these two attendees match...
 557                          */
 558                         if (!strcasecmp(
 559                            icalproperty_get_attendee(e_attendee),
 560                            icalproperty_get_attendee(r_attendee)
 561                         )) {
 562                                 /* ...and if they do, remove the attendee from the event
 563                                  * and replace it with the attendee from the reply.  (The
 564                                  * reply's copy will have the same address, but an updated
 565                                  * status.)
 566                                  */
 567                                 icalcomponent_remove_property(event, e_attendee);
 568                                 icalproperty_free(e_attendee);
 569                                 icalcomponent_remove_property(reply, r_attendee);
 570                                 icalcomponent_add_property(event, r_attendee);
 571
 572                                 /* Since we diddled both sets of attendees, we have to start
 573                                  * the iteration over again.  This will not create an infinite
 574                                  * loop because we removed the attendee from the reply.  (That's
 575                                  * why we cloned the reply, and that's what we mean by "ripping
 576                                  * its guts out.")
 577                                  */
 578                                 goto STARTOVER;
 579                         }
 580
 581                 }
 582         }
 583
 584         /* Free the *clone* of the reply. */
 585         icalcomponent_free(reply);
 586 }
 587
 588
 589
 590
 591 /*
 592  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 593  * calendar event.  The object has already been deserialized for us; all
 594  * we have to do here is hunt for the event in our calendar, merge in the
 595  * updated attendee status, and save it again.
 596  *
 597  * This function returns 0 on success, 1 if the event was not found in the
 598  * user's calendar, or 2 if an internal error occurred.
 599  */
 600 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 601         char uid[SIZ];
 602         char hold_rm[ROOMNAMELEN];
 603         long msgnum_being_replaced = 0;
 604         struct CtdlMessage *msg = NULL;
 605         struct original_event_container oec;
 606         icalcomponent *original_event;
 607         char *serialized_event = NULL;
 608         char roomname[ROOMNAMELEN];
 609         char *message_text = NULL;
 610
 611         /* Figure out just what event it is we're dealing with */
 612         strcpy(uid, "--==<< InVaLiD uId >>==--");
 613         ical_learn_uid_of_reply(uid, cal);
 614         lprintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 615
 616         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 617
 618         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 619                 getroom(&CC->room, hold_rm);
 620                 lprintf(CTDL_CRIT, "cannot get user calendar room\n");
 621                 return(2);
 622         }
 623
 624         /*
 625          * Look in the EUID index for a message with
 626          * the Citadel EUID set to the value we're looking for.  Since
 627          * Citadel always sets the message EUID to the vCalendar UID of
 628          * the event, this will work.
 629          */
 630         msgnum_being_replaced = locate_message_by_euid(uid, &CC->room);
 631
 632         getroom(&CC->room, hold_rm);    /* return to saved room */
 633
 634         lprintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 635         if (msgnum_being_replaced == 0) {
 636                 return(1);                      /* no calendar event found */
 637         }
 638
 639         /* Now we know the ID of the message containing the event being updated.
 640          * We don't actually have to delete it; that'll get taken care of by the
 641          * server when we save another event with the same UID.  This just gives
 642          * us the ability to load the event into memory so we can diddle the
 643          * attendees.
 644          */
 645         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 646         if (msg == NULL) {
 647                 return(2);                      /* internal error */
 648         }
 649         oec.c = NULL;
 650         mime_parser(msg->cm_fields['M'],
 651                 NULL,
 652                 *ical_locate_original_event,    /* callback function */
 653                 NULL, NULL,
 654                 &oec,                           /* user data */
 655                 0
 656         );
 657         CtdlFreeMessage(msg);
 658
 659         original_event = oec.c;
 660         if (original_event == NULL) {
 661                 lprintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 662                 return(2);
 663         }
 664
 665         /* Merge the attendee's updated status into the event */
 666         ical_merge_attendee_reply(original_event, cal);
 667
 668         /* Serialize it */
 669         serialized_event = strdup(icalcomponent_as_ical_string(original_event));
 670         icalcomponent_free(original_event);     /* Don't need this anymore. */
 671         if (serialized_event == NULL) return(2);
 672
 673         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 674
 675         message_text = malloc(strlen(serialized_event) + SIZ);
 676         if (message_text != NULL) {
 677                 sprintf(message_text,
 678                         "Content-type: text/calendar charset=\"utf-8\"\r\n\r\n%s\r\n",
 679                         serialized_event
 680                 );
 681
 682                 msg = CtdlMakeMessage(&CC->user,
 683                         "",                     /* No recipient */
 684                         "",                     /* No recipient */
 685                         roomname,
 686                         0, FMT_RFC822,
 687                         "",
 688                         "",             /* no subject */
 689                         NULL,
 690                         message_text);
 691
 692                 if (msg != NULL) {
 693                         CIT_ICAL->avoid_sending_invitations = 1;
 694                         CtdlSubmitMsg(msg, NULL, roomname);
 695                         CtdlFreeMessage(msg);
 696                         CIT_ICAL->avoid_sending_invitations = 0;
 697                 }
 698         }
 699         free(serialized_event);
 700         return(0);
 701 }
 702
 703
 704 /*
 705  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 706  * simply extracts the calendar object from the message, deserializes it, and
 707  * passes it up to ical_update_my_calendar_with_reply() for processing.
 708  */
 709 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 710         struct CtdlMessage *msg = NULL;
 711         struct ical_respond_data ird;
 712         int ret;
 713
 714         if (
 715            (strcasecmp(action, "update"))
 716            && (strcasecmp(action, "ignore"))
 717         ) {
 718                 cprintf("%d Action must be 'update' or 'ignore'\n",
 719                         ERROR + ILLEGAL_VALUE
 720                 );
 721                 return;
 722         }
 723
 724         msg = CtdlFetchMessage(msgnum, 1);
 725         if (msg == NULL) {
 726                 cprintf("%d Message %ld not found.\n",
 727                         ERROR + ILLEGAL_VALUE,
 728                         (long)msgnum
 729                 );
 730                 return;
 731         }
 732
 733         memset(&ird, 0, sizeof ird);
 734         strcpy(ird.desired_partnum, partnum);
 735         mime_parser(msg->cm_fields['M'],
 736                 NULL,
 737                 *ical_locate_part,              /* callback function */
 738                 NULL, NULL,
 739                 (void *) &ird,                  /* user data */
 740                 0
 741         );
 742
 743         /* We're done with the incoming message, because we now have a
 744          * calendar object in memory.
 745          */
 746         CtdlFreeMessage(msg);
 747
 748         /*
 749          * Here is the real meat of this function.  Handle the event.
 750          */
 751         if (ird.cal != NULL) {
 752                 /* Update the user's calendar if necessary */
 753                 if (!strcasecmp(action, "update")) {
 754                         ret = ical_update_my_calendar_with_reply(ird.cal);
 755                         if (ret == 0) {
 756                                 cprintf("%d Your calendar has been updated with this reply.\n",
 757                                         CIT_OK);
 758                         }
 759                         else if (ret == 1) {
 760                                 cprintf("%d This event does not exist in your calendar.\n",
 761                                         ERROR + FILE_NOT_FOUND);
 762                         }
 763                         else {
 764                                 cprintf("%d An internal error occurred.\n",
 765                                         ERROR + INTERNAL_ERROR);
 766                         }
 767                 }
 768                 else {
 769                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 770                 }
 771
 772                 /* Now that we've processed this message, we don't need it
 773                  * anymore.  So delete it.  (Maybe make this optional?)
 774                  */
 775                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 776
 777                 /* Free the memory we allocated and return a response. */
 778                 icalcomponent_free(ird.cal);
 779                 ird.cal = NULL;
 780                 return;
 781         }
 782         else {
 783                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 784                 return;
 785         }
 786
 787         /* should never get here */
 788 }
 789
 790
 791 /*
 792  * Search for a property in both the top level and in a VEVENT subcomponent
 793  */
 794 icalproperty *ical_ctdl_get_subprop(
 795                 icalcomponent *cal,
 796                 icalproperty_kind which_prop
 797 ) {
 798         icalproperty *p;
 799         icalcomponent *c;
 800
 801         p = icalcomponent_get_first_property(cal, which_prop);
 802         if (p == NULL) {
 803                 c = icalcomponent_get_first_component(cal,
 804                                                         ICAL_VEVENT_COMPONENT);
 805                 if (c != NULL) {
 806                         p = icalcomponent_get_first_property(c, which_prop);
 807                 }
 808         }
 809         return p;
 810 }
 811
 812
 813 /*
 814  * Check to see if two events overlap.  Returns nonzero if they do.
 815  * (This function is used in both Citadel and WebCit.  If you change it in
 816  * one place, change it in the other.  Better yet, put it in a library.)
 817  */
 818 int ical_ctdl_is_overlap(
 819                         struct icaltimetype t1start,
 820                         struct icaltimetype t1end,
 821                         struct icaltimetype t2start,
 822                         struct icaltimetype t2end
 823 ) {
 824
 825         if (icaltime_is_null_time(t1start)) return(0);
 826         if (icaltime_is_null_time(t2start)) return(0);
 827
 828         /* First, check for all-day events */
 829         if (t1start.is_date) {
 830                 if (!icaltime_compare_date_only(t1start, t2start)) {
 831                         return(1);
 832                 }
 833                 if (!icaltime_is_null_time(t2end)) {
 834                         if (!icaltime_compare_date_only(t1start, t2end)) {
 835                                 return(1);
 836                         }
 837                 }
 838         }
 839
 840         if (t2start.is_date) {
 841                 if (!icaltime_compare_date_only(t2start, t1start)) {
 842                         return(1);
 843                 }
 844                 if (!icaltime_is_null_time(t1end)) {
 845                         if (!icaltime_compare_date_only(t2start, t1end)) {
 846                                 return(1);
 847                         }
 848                 }
 849         }
 850
 851         /* Now check for overlaps using date *and* time. */
 852
 853         /* First, bail out if either event 1 or event 2 is missing end time. */
 854         if (icaltime_is_null_time(t1end)) return(0);
 855         if (icaltime_is_null_time(t2end)) return(0);
 856
 857         /* If event 1 ends before event 2 starts, we're in the clear. */
 858         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 859
 860         /* If event 2 ends before event 1 starts, we're also ok. */
 861         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 862
 863         /* Otherwise, they overlap. */
 864         return(1);
 865 }
 866
 867
 868
 869 /*
 870  * Backend for ical_hunt_for_conflicts()
 871  */
 872 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 873         icalcomponent *cal;
 874         struct CtdlMessage *msg = NULL;
 875         struct ical_respond_data ird;
 876         struct icaltimetype t1start, t1end, t2start, t2end;
 877         icalproperty *p;
 878         char conflict_event_uid[SIZ];
 879         char conflict_event_summary[SIZ];
 880         char compare_uid[SIZ];
 881
 882         cal = (icalcomponent *)data;
 883         strcpy(compare_uid, "");
 884         strcpy(conflict_event_uid, "");
 885         strcpy(conflict_event_summary, "");
 886
 887         msg = CtdlFetchMessage(msgnum, 1);
 888         if (msg == NULL) return;
 889         memset(&ird, 0, sizeof ird);
 890         strcpy(ird.desired_partnum, "_HUNT_");
 891         mime_parser(msg->cm_fields['M'],
 892                 NULL,
 893                 *ical_locate_part,              /* callback function */
 894                 NULL, NULL,
 895                 (void *) &ird,                  /* user data */
 896                 0
 897         );
 898         CtdlFreeMessage(msg);
 899
 900         if (ird.cal == NULL) return;
 901
 902         t1start = icaltime_null_time();
 903         t1end = icaltime_null_time();
 904         t2start = icaltime_null_time();
 905         t1end = icaltime_null_time();
 906
 907         /* Now compare cal to ird.cal */
 908         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 909         if (p == NULL) return;
 910         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 911
 912         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 913         if (p != NULL) t2end = icalproperty_get_dtend(p);
 914
 915         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 916         if (p == NULL) return;
 917         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 918
 919         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 920         if (p != NULL) t1end = icalproperty_get_dtend(p);
 921
 922         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 923         if (p != NULL) {
 924                 strcpy(compare_uid, icalproperty_get_comment(p));
 925         }
 926
 927         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 928         if (p != NULL) {
 929                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 930         }
 931
 932         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 933         if (p != NULL) {
 934                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 935         }
 936
 937         icalcomponent_free(ird.cal);
 938
 939         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 940                 cprintf("%ld||%s|%s|%d|\n",
 941                         msgnum,
 942                         conflict_event_uid,
 943                         conflict_event_summary,
 944                         (       ((strlen(compare_uid)>0)
 945                                 &&(!strcasecmp(compare_uid,
 946                                 conflict_event_uid))) ? 1 : 0
 947                         )
 948                 );
 949         }
 950 }
 951
 952
 953
 954 /*
 955  * Phase 2 of "hunt for conflicts" operation.
 956  * At this point we have a calendar object which represents the VEVENT that
 957  * we're considering adding to the calendar.  Now hunt through the user's
 958  * calendar room, and output zero or more existing VEVENTs which conflict
 959  * with this one.
 960  */
 961 void ical_hunt_for_conflicts(icalcomponent *cal) {
 962         char hold_rm[ROOMNAMELEN];
 963
 964         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 965
 966         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 967                 getroom(&CC->room, hold_rm);
 968                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
 969                 return;
 970         }
 971
 972         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 973
 974         CtdlForEachMessage(MSGS_ALL, 0, NULL, "text/calendar",
 975                 NULL,
 976                 ical_hunt_for_conflicts_backend,
 977                 (void *) cal
 978         );
 979
 980         cprintf("000\n");
 981         getroom(&CC->room, hold_rm);    /* return to saved room */
 982
 983 }
 984
 985
 986
 987 /*
 988  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 989  */
 990 void ical_conflicts(long msgnum, char *partnum) {
 991         struct CtdlMessage *msg = NULL;
 992         struct ical_respond_data ird;
 993
 994         msg = CtdlFetchMessage(msgnum, 1);
 995         if (msg == NULL) {
 996                 cprintf("%d Message %ld not found.\n",
 997                         ERROR + ILLEGAL_VALUE,
 998                         (long)msgnum
 999                 );
1000                 return;
1001         }
1002
1003         memset(&ird, 0, sizeof ird);
1004         strcpy(ird.desired_partnum, partnum);
1005         mime_parser(msg->cm_fields['M'],
1006                 NULL,
1007                 *ical_locate_part,              /* callback function */
1008                 NULL, NULL,
1009                 (void *) &ird,                  /* user data */
1010                 0
1011         );
1012
1013         CtdlFreeMessage(msg);
1014
1015         if (ird.cal != NULL) {
1016                 ical_hunt_for_conflicts(ird.cal);
1017                 icalcomponent_free(ird.cal);
1018                 return;
1019         }
1020         else {
1021                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1022                 return;
1023         }
1024
1025         /* should never get here */
1026 }
1027
1028
1029
1030 /*
1031  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1032  */
1033 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1034         icalproperty *p;
1035         icalvalue *v;
1036         struct icalperiodtype my_period;
1037
1038         if (cal == NULL) return;
1039         my_period = icalperiodtype_null_period();
1040
1041         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1042                 ical_add_to_freebusy(fb,
1043                         icalcomponent_get_first_component(
1044                                 cal, ICAL_VEVENT_COMPONENT
1045                         )
1046                 );
1047                 return;
1048         }
1049
1050         ical_dezonify(cal);
1051
1052         /* If this event is not opaque, the user isn't publishing it as
1053          * busy time, so don't bother doing anything else.
1054          */
1055         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1056         if (p != NULL) {
1057                 v = icalproperty_get_value(p);
1058                 if (v != NULL) {
1059                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1060                                 return;
1061                         }
1062                 }
1063         }
1064
1065         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1066         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1067         if (p != NULL) {
1068                 my_period.start = icalproperty_get_dtstart(p);
1069         }
1070
1071         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1072         if (p != NULL) {
1073                 my_period.end = icalproperty_get_dtstart(p);
1074         }
1075
1076         /* Now add it. */
1077         icalcomponent_add_property(fb,
1078                 icalproperty_new_freebusy(my_period)
1079         );
1080
1081         /* Make sure the DTSTART property of the freebusy *list* is set to
1082          * the DTSTART property of the *earliest event*.
1083          */
1084         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1085         if (p == NULL) {
1086                 icalcomponent_set_dtstart(fb,
1087                         icalcomponent_get_dtstart(cal) );
1088         }
1089         else {
1090                 if (icaltime_compare(
1091                         icalcomponent_get_dtstart(cal),
1092                         icalcomponent_get_dtstart(fb)
1093                    ) < 0) {
1094                         icalcomponent_set_dtstart(fb,
1095                                 icalcomponent_get_dtstart(cal) );
1096                 }
1097         }
1098
1099         /* Make sure the DTEND property of the freebusy *list* is set to
1100          * the DTEND property of the *latest event*.
1101          */
1102         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1103         if (p == NULL) {
1104                 icalcomponent_set_dtend(fb,
1105                         icalcomponent_get_dtend(cal) );
1106         }
1107         else {
1108                 if (icaltime_compare(
1109                         icalcomponent_get_dtend(cal),
1110                         icalcomponent_get_dtend(fb)
1111                    ) > 0) {
1112                         icalcomponent_set_dtend(fb,
1113                                 icalcomponent_get_dtend(cal) );
1114                 }
1115         }
1116
1117 }
1118
1119
1120
1121 /*
1122  * Backend for ical_freebusy()
1123  *
1124  * This function simply loads the messages in the user's calendar room,
1125  * which contain VEVENTs, then strips them of all non-freebusy data, and
1126  * adds them to the supplied VCALENDAR.
1127  *
1128  */
1129 void ical_freebusy_backend(long msgnum, void *data) {
1130         icalcomponent *cal;
1131         struct CtdlMessage *msg = NULL;
1132         struct ical_respond_data ird;
1133
1134         cal = (icalcomponent *)data;
1135
1136         msg = CtdlFetchMessage(msgnum, 1);
1137         if (msg == NULL) return;
1138         memset(&ird, 0, sizeof ird);
1139         strcpy(ird.desired_partnum, "_HUNT_");
1140         mime_parser(msg->cm_fields['M'],
1141                 NULL,
1142                 *ical_locate_part,              /* callback function */
1143                 NULL, NULL,
1144                 (void *) &ird,                  /* user data */
1145                 0
1146         );
1147         CtdlFreeMessage(msg);
1148
1149         if (ird.cal == NULL) return;
1150
1151         ical_add_to_freebusy(cal, ird.cal);
1152
1153         /* Now free the memory. */
1154         icalcomponent_free(ird.cal);
1155 }
1156
1157
1158
1159 /*
1160  * Grab another user's free/busy times
1161  */
1162 void ical_freebusy(char *who) {
1163         struct ctdluser usbuf;
1164         char calendar_room_name[ROOMNAMELEN];
1165         char hold_rm[ROOMNAMELEN];
1166         char *serialized_request = NULL;
1167         icalcomponent *encaps = NULL;
1168         icalcomponent *fb = NULL;
1169         int found_user = (-1);
1170         struct recptypes *recp = NULL;
1171         char buf[256];
1172         char host[256];
1173         char type[256];
1174         int i = 0;
1175         int config_lines = 0;
1176
1177         /* First try an exact match. */
1178         found_user = getuser(&usbuf, who);
1179
1180         /* If not found, try it as an unqualified email address. */
1181         if (found_user != 0) {
1182                 strcpy(buf, who);
1183                 recp = validate_recipients(buf);
1184                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1185                 if (recp != NULL) {
1186                         if (recp->num_local == 1) {
1187                                 found_user = getuser(&usbuf, recp->recp_local);
1188                         }
1189                         free(recp);
1190                 }
1191         }
1192
1193         /* If still not found, try it as an address qualified with the
1194          * primary FQDN of this Citadel node.
1195          */
1196         if (found_user != 0) {
1197                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1198                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1199                 recp = validate_recipients(buf);
1200                 if (recp != NULL) {
1201                         if (recp->num_local == 1) {
1202                                 found_user = getuser(&usbuf, recp->recp_local);
1203                         }
1204                         free(recp);
1205                 }
1206         }
1207
1208         /* Still not found?  Try qualifying it with every domain we
1209          * might have addresses in.
1210          */
1211         if (found_user != 0) {
1212                 config_lines = num_tokens(inetcfg, '\n');
1213                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1214                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1215                         extract_token(host, buf, 0, '|', sizeof host);
1216                         extract_token(type, buf, 1, '|', sizeof type);
1217
1218                         if ( (!strcasecmp(type, "localhost"))
1219                            || (!strcasecmp(type, "directory")) ) {
1220                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1221                                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1222                                 recp = validate_recipients(buf);
1223                                 if (recp != NULL) {
1224                                         if (recp->num_local == 1) {
1225                                                 found_user = getuser(&usbuf, recp->recp_local);
1226                                         }
1227                                         free(recp);
1228                                 }
1229                         }
1230                 }
1231         }
1232
1233         if (found_user != 0) {
1234                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1235                 return;
1236         }
1237
1238         MailboxName(calendar_room_name, sizeof calendar_room_name,
1239                 &usbuf, USERCALENDARROOM);
1240
1241         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1242
1243         if (getroom(&CC->room, calendar_room_name) != 0) {
1244                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1245                 getroom(&CC->room, hold_rm);
1246                 return;
1247         }
1248
1249         /* Create a VFREEBUSY subcomponent */
1250         lprintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1251         fb = icalcomponent_new_vfreebusy();
1252         if (fb == NULL) {
1253                 cprintf("%d Internal error: cannot allocate memory.\n",
1254                         ERROR + INTERNAL_ERROR);
1255                 icalcomponent_free(encaps);
1256                 getroom(&CC->room, hold_rm);
1257                 return;
1258         }
1259
1260         /* Set the method to PUBLISH */
1261         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1262
1263         /* Set the DTSTAMP to right now. */
1264         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1265
1266         /* Add the user's email address as ORGANIZER */
1267         sprintf(buf, "MAILTO:%s", who);
1268         if (strchr(buf, '@') == NULL) {
1269                 strcat(buf, "@");
1270                 strcat(buf, config.c_fqdn);
1271         }
1272         for (i=0; i<strlen(buf); ++i) {
1273                 if (buf[i]==' ') buf[i] = '_';
1274         }
1275         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1276
1277         /* Add busy time from events */
1278         lprintf(CTDL_DEBUG, "Adding busy time from events\n");
1279         CtdlForEachMessage(MSGS_ALL, 0, NULL, "text/calendar",
1280                 NULL, ical_freebusy_backend, (void *)fb
1281         );
1282
1283         /* If values for DTSTART and DTEND are still not present, set them
1284          * to yesterday and tomorrow as default values.
1285          */
1286         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1287                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1288         }
1289         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1290                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1291         }
1292
1293         /* Put the freebusy component into the calendar component */
1294         lprintf(CTDL_DEBUG, "Encapsulating\n");
1295         encaps = ical_encapsulate_subcomponent(fb);
1296         if (encaps == NULL) {
1297                 icalcomponent_free(fb);
1298                 cprintf("%d Internal error: cannot allocate memory.\n",
1299                         ERROR + INTERNAL_ERROR);
1300                 getroom(&CC->room, hold_rm);
1301                 return;
1302         }
1303
1304         /* Set the method to PUBLISH */
1305         lprintf(CTDL_DEBUG, "Setting method\n");
1306         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1307
1308         /* Serialize it */
1309         lprintf(CTDL_DEBUG, "Serializing\n");
1310         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1311         icalcomponent_free(encaps);     /* Don't need this anymore. */
1312
1313         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1314         if (serialized_request != NULL) {
1315                 client_write(serialized_request, strlen(serialized_request));
1316                 free(serialized_request);
1317         }
1318         cprintf("\n000\n");
1319
1320         /* Go back to the room from which we came... */
1321         getroom(&CC->room, hold_rm);
1322 }
1323
1324
1325
1326 /*
1327  * Backend for ical_getics()
1328  *
1329  * This is a ForEachMessage() callback function that searches the current room
1330  * for calendar events and adds them each into one big calendar component.
1331  */
1332 void ical_getics_backend(long msgnum, void *data) {
1333         icalcomponent *encaps, *c;
1334         struct CtdlMessage *msg = NULL;
1335         struct ical_respond_data ird;
1336
1337         encaps = (icalcomponent *)data;
1338         if (encaps == NULL) return;
1339
1340         /* Look for the calendar event... */
1341
1342         msg = CtdlFetchMessage(msgnum, 1);
1343         if (msg == NULL) return;
1344         memset(&ird, 0, sizeof ird);
1345         strcpy(ird.desired_partnum, "_HUNT_");
1346         mime_parser(msg->cm_fields['M'],
1347                 NULL,
1348                 *ical_locate_part,              /* callback function */
1349                 NULL, NULL,
1350                 (void *) &ird,                  /* user data */
1351                 0
1352         );
1353         CtdlFreeMessage(msg);
1354
1355         if (ird.cal == NULL) return;
1356
1357         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1358          * are responsible for "the_request"'s memory -- it will be freed
1359          * when we free "encaps".
1360          */
1361
1362         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1363          * in.  This will almost never happen.
1364          */
1365         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1366                 icalcomponent_add_component(encaps, ird.cal);
1367         }
1368         /*
1369          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1370          * and other components encapsulated inside, we have to extract them.
1371          */
1372         else {
1373                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1374                     (c != NULL);
1375                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1376                         icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1377                 }
1378                 icalcomponent_free(ird.cal);
1379         }
1380 }
1381
1382
1383
1384 /*
1385  * Retrieve all of the calendar items in the current room, and output them
1386  * as a single icalendar object.
1387  */
1388 void ical_getics(void)
1389 {
1390         icalcomponent *encaps = NULL;
1391         char *ser = NULL;
1392
1393         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1394            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1395                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1396                 return;         /* Not a vCalendar-centric room */
1397         }
1398
1399         encaps = icalcomponent_new_vcalendar();
1400         if (encaps == NULL) {
1401                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1402                         __FILE__, __LINE__);
1403                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1404                 return;
1405         }
1406
1407         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1408
1409         /* Set the Product ID */
1410         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1411
1412         /* Set the Version Number */
1413         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1414
1415         /* Set the method to REQUEST */
1416         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1417
1418         /* Now go through the room encapsulating all calendar items. */
1419         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1420                 "text/calendar",
1421                 NULL,
1422                 ical_getics_backend,
1423                 (void *) encaps
1424         );
1425
1426         ser = strdup(icalcomponent_as_ical_string(encaps));
1427         client_write(ser, strlen(ser));
1428         free(ser);
1429         cprintf("\n000\n");
1430         icalcomponent_free(encaps);     /* Don't need this anymore. */
1431
1432 }
1433
1434
1435 /*
1436  * Delete all of the calendar items in the current room, and replace them
1437  * with calendar items from a client-supplied data stream.
1438  */
1439 void ical_putics(void)
1440 {
1441         char *calstream = NULL;
1442         icalcomponent *cal;
1443         icalcomponent *c;
1444
1445         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1446            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1447                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1448                 return;         /* Not a vCalendar-centric room */
1449         }
1450
1451         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1452                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1453                 return;
1454         }
1455
1456         cprintf("%d Transmit data now\n", SEND_LISTING);
1457         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0);
1458         if (calstream == NULL) {
1459                 return;
1460         }
1461
1462         cal = icalcomponent_new_from_string(calstream);
1463         free(calstream);
1464         ical_dezonify(cal);
1465
1466         /* We got our data stream -- now do something with it. */
1467
1468         /* Delete the existing messages in the room, because we are replacing
1469          * the entire calendar with an entire new (or updated) calendar.
1470          * (Careful: this opens an S_ROOMS critical section!)
1471          */
1472         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1473
1474         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1475          * in.  This will almost never happen.
1476          */
1477         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1478                 ical_write_to_cal(&CC->user, cal);
1479         }
1480         /*
1481          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1482          * and other components encapsulated inside, we have to extract them.
1483          */
1484         else {
1485                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1486                     (c != NULL);
1487                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1488                         ical_write_to_cal(&CC->user, c);
1489                 }
1490         }
1491
1492         icalcomponent_free(cal);
1493 }
1494
1495
1496 /*
1497  * All Citadel calendar commands from the client come through here.
1498  */
1499 void cmd_ical(char *argbuf)
1500 {
1501         char subcmd[64];
1502         long msgnum;
1503         char partnum[256];
1504         char action[256];
1505         char who[256];
1506
1507         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1508
1509         /* Allow "test" and "freebusy" subcommands without logging in. */
1510
1511         if (!strcasecmp(subcmd, "test")) {
1512                 cprintf("%d This server supports calendaring\n", CIT_OK);
1513                 return;
1514         }
1515
1516         if (!strcasecmp(subcmd, "freebusy")) {
1517                 extract_token(who, argbuf, 1, '|', sizeof who);
1518                 ical_freebusy(who);
1519                 return;
1520         }
1521
1522         if (!strcasecmp(subcmd, "sgi")) {
1523                 CIT_ICAL->server_generated_invitations =
1524                         (extract_int(argbuf, 1) ? 1 : 0) ;
1525                 cprintf("%d %d\n",
1526                         CIT_OK, CIT_ICAL->server_generated_invitations);
1527                 return;
1528         }
1529
1530         if (CtdlAccessCheck(ac_logged_in)) return;
1531
1532         if (!strcasecmp(subcmd, "respond")) {
1533                 msgnum = extract_long(argbuf, 1);
1534                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1535                 extract_token(action, argbuf, 3, '|', sizeof action);
1536                 ical_respond(msgnum, partnum, action);
1537                 return;
1538         }
1539
1540         if (!strcasecmp(subcmd, "handle_rsvp")) {
1541                 msgnum = extract_long(argbuf, 1);
1542                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1543                 extract_token(action, argbuf, 3, '|', sizeof action);
1544                 ical_handle_rsvp(msgnum, partnum, action);
1545                 return;
1546         }
1547
1548         if (!strcasecmp(subcmd, "conflicts")) {
1549                 msgnum = extract_long(argbuf, 1);
1550                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1551                 ical_conflicts(msgnum, partnum);
1552                 return;
1553         }
1554
1555         if (!strcasecmp(subcmd, "getics")) {
1556                 ical_getics();
1557                 return;
1558         }
1559
1560         if (!strcasecmp(subcmd, "putics")) {
1561                 ical_putics();
1562                 return;
1563         }
1564
1565         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1566 }
1567
1568
1569
1570 /*
1571  * We don't know if the calendar room exists so we just create it at login
1572  */
1573 void ical_create_room(void)
1574 {
1575         struct ctdlroom qr;
1576         struct visit vbuf;
1577
1578         /* Create the calendar room if it doesn't already exist */
1579         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1580
1581         /* Set expiration policy to manual; otherwise objects will be lost! */
1582         if (lgetroom(&qr, USERCALENDARROOM)) {
1583                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1584                 return;
1585         }
1586         qr.QRep.expire_mode = EXPIRE_MANUAL;
1587         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1588         lputroom(&qr);
1589
1590         /* Set the view to a calendar view */
1591         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1592         vbuf.v_view = VIEW_CALENDAR;
1593         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1594
1595         /* Create the tasks list room if it doesn't already exist */
1596         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1597
1598         /* Set expiration policy to manual; otherwise objects will be lost! */
1599         if (lgetroom(&qr, USERTASKSROOM)) {
1600                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1601                 return;
1602         }
1603         qr.QRep.expire_mode = EXPIRE_MANUAL;
1604         qr.QRdefaultview = VIEW_TASKS;
1605         lputroom(&qr);
1606
1607         /* Set the view to a task list view */
1608         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1609         vbuf.v_view = VIEW_TASKS;
1610         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1611
1612         /* Create the notes room if it doesn't already exist */
1613         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1614
1615         /* Set expiration policy to manual; otherwise objects will be lost! */
1616         if (lgetroom(&qr, USERNOTESROOM)) {
1617                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1618                 return;
1619         }
1620         qr.QRep.expire_mode = EXPIRE_MANUAL;
1621         qr.QRdefaultview = VIEW_NOTES;
1622         lputroom(&qr);
1623
1624         /* Set the view to a notes view */
1625         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1626         vbuf.v_view = VIEW_NOTES;
1627         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1628
1629         return;
1630 }
1631
1632
1633 /*
1634  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1635  * finds a VEVENT.
1636  */
1637 void ical_send_out_invitations(icalcomponent *cal) {
1638         icalcomponent *the_request = NULL;
1639         char *serialized_request = NULL;
1640         icalcomponent *encaps = NULL;
1641         char *request_message_text = NULL;
1642         struct CtdlMessage *msg = NULL;
1643         struct recptypes *valid = NULL;
1644         char attendees_string[SIZ];
1645         int num_attendees = 0;
1646         char this_attendee[256];
1647         icalproperty *attendee = NULL;
1648         char summary_string[SIZ];
1649         icalproperty *summary = NULL;
1650
1651         if (cal == NULL) {
1652                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1653                 return;
1654         }
1655
1656
1657         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1658         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1659                 ical_send_out_invitations(
1660                         icalcomponent_get_first_component(
1661                                 cal, ICAL_VEVENT_COMPONENT
1662                         )
1663                 );
1664                 return;
1665         }
1666
1667         /* Clone the event */
1668         the_request = icalcomponent_new_clone(cal);
1669         if (the_request == NULL) {
1670                 lprintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1671                 return;
1672         }
1673
1674         /* Extract the summary string -- we'll use it as the
1675          * message subject for the request
1676          */
1677         strcpy(summary_string, "Meeting request");
1678         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1679         if (summary != NULL) {
1680                 if (icalproperty_get_summary(summary)) {
1681                         strcpy(summary_string,
1682                                 icalproperty_get_summary(summary) );
1683                 }
1684         }
1685
1686         /* Determine who the recipients of this message are (the attendees) */
1687         strcpy(attendees_string, "");
1688         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1689                 if (icalproperty_get_attendee(attendee)) {
1690                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1691                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1692                                 strcpy(this_attendee, &this_attendee[7]);
1693
1694                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1695                                         snprintf(&attendees_string[strlen(attendees_string)],
1696                                                 sizeof(attendees_string) - strlen(attendees_string),
1697                                                 "%s, ",
1698                                                 this_attendee
1699                                         );
1700                                         ++num_attendees;
1701                                 }
1702                         }
1703                 }
1704         }
1705
1706         lprintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1707
1708         /* If there are no attendees, there are no invitations to send, so...
1709          * don't bother putting one together!  Punch out, Maverick!
1710          */
1711         if (num_attendees == 0) {
1712                 icalcomponent_free(the_request);
1713                 return;
1714         }
1715
1716         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1717         encaps = icalcomponent_new_vcalendar();
1718         if (encaps == NULL) {
1719                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1720                         __FILE__, __LINE__);
1721                 icalcomponent_free(the_request);
1722                 return;
1723         }
1724
1725         /* Set the Product ID */
1726         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1727
1728         /* Set the Version Number */
1729         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1730
1731         /* Set the method to REQUEST */
1732         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1733
1734         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1735         ical_dezonify(the_request);
1736
1737         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1738          * are responsible for "the_request"'s memory -- it will be freed
1739          * when we free "encaps".
1740          */
1741         icalcomponent_add_component(encaps, the_request);
1742
1743         /* Serialize it */
1744         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1745         icalcomponent_free(encaps);     /* Don't need this anymore. */
1746         if (serialized_request == NULL) return;
1747
1748         request_message_text = malloc(strlen(serialized_request) + SIZ);
1749         if (request_message_text != NULL) {
1750                 sprintf(request_message_text,
1751                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1752                         serialized_request
1753                 );
1754
1755                 msg = CtdlMakeMessage(&CC->user,
1756                         "",                     /* No single recipient here */
1757                         "",                     /* No single recipient here */
1758                         CC->room.QRname, 0, FMT_RFC822,
1759                         "",
1760                         summary_string,         /* Use summary for subject */
1761                         NULL,
1762                         request_message_text);
1763
1764                 if (msg != NULL) {
1765                         valid = validate_recipients(attendees_string);
1766                         CtdlSubmitMsg(msg, valid, "");
1767                         CtdlFreeMessage(msg);
1768                         free (valid);
1769                 }
1770         }
1771         free(serialized_request);
1772 }
1773
1774
1775 /*
1776  * When a calendar object is being saved, determine whether it's a VEVENT
1777  * and the user saving it is the organizer.  If so, send out invitations
1778  * to any listed attendees.
1779  *
1780  */
1781 void ical_saving_vevent(icalcomponent *cal) {
1782         icalcomponent *c;
1783         icalproperty *organizer = NULL;
1784         char organizer_string[SIZ];
1785
1786         lprintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
1787
1788         /* Don't send out invitations unless the client wants us to. */
1789         if (CIT_ICAL->server_generated_invitations == 0) {
1790                 return;
1791         }
1792
1793         /* Don't send out invitations if we've been asked not to. */
1794         if (CIT_ICAL->avoid_sending_invitations > 0) {
1795                 return;
1796         }
1797
1798         strcpy(organizer_string, "");
1799         /*
1800          * The VEVENT subcomponent is the one we're interested in.
1801          * Send out invitations if, and only if, this user is the Organizer.
1802          */
1803         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1804                 organizer = icalcomponent_get_first_property(cal,
1805                                                 ICAL_ORGANIZER_PROPERTY);
1806                 if (organizer != NULL) {
1807                         if (icalproperty_get_organizer(organizer)) {
1808                                 strcpy(organizer_string,
1809                                         icalproperty_get_organizer(organizer));
1810                         }
1811                 }
1812                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1813                         strcpy(organizer_string, &organizer_string[7]);
1814                         striplt(organizer_string);
1815                         /*
1816                          * If the user saving the event is listed as the
1817                          * organizer, then send out invitations.
1818                          */
1819                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
1820                                 ical_send_out_invitations(cal);
1821                         }
1822                 }
1823         }
1824
1825         /* If the component has subcomponents, recurse through them. */
1826         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1827             (c != NULL);
1828             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1829                 /* Recursively process subcomponent */
1830                 ical_saving_vevent(c);
1831         }
1832
1833 }
1834
1835
1836
1837 /*
1838  * Back end for ical_obj_beforesave()
1839  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1840  * the summary of the event (becomes message subject),
1841  * and the start time (becomes message date/time).
1842  */
1843 void ical_ctdl_set_exclusive_msgid(char *name, char *filename, char *partnum,
1844                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1845                 char *encoding, void *cbuserdata)
1846 {
1847         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
1848         icalproperty *p;
1849         struct icalmessagemod *imm;
1850         char new_uid[SIZ];
1851
1852         imm = (struct icalmessagemod *)cbuserdata;
1853
1854         /* We're only interested in calendar data. */
1855         if (strcasecmp(cbtype, "text/calendar")) {
1856                 return;
1857         }
1858
1859         /* Hunt for the UID and drop it in
1860          * the "user data" pointer for the MIME parser.  When
1861          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1862          * to that string.
1863          */
1864         whole_cal = icalcomponent_new_from_string(content);
1865         cal = whole_cal;
1866         if (cal != NULL) {
1867                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1868                         nested_event = icalcomponent_get_first_component(
1869                                 cal, ICAL_VEVENT_COMPONENT);
1870                         if (nested_event != NULL) {
1871                                 cal = nested_event;
1872                         }
1873                         else {
1874                                 nested_todo = icalcomponent_get_first_component(
1875                                         cal, ICAL_VTODO_COMPONENT);
1876                                 if (nested_todo != NULL) {
1877                                         cal = nested_todo;
1878                                 }
1879                         }
1880                 }
1881
1882                 if (cal != NULL) {
1883                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1884                         if (p == NULL) {
1885                                 /* If there's no uid we must generate one */
1886                                 generate_uuid(new_uid);
1887                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
1888                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1889                         }
1890                         if (p != NULL) {
1891                                 strcpy(imm->uid, icalproperty_get_comment(p));
1892                         }
1893                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1894                         if (p != NULL) {
1895                                 strcpy(imm->subject, icalproperty_get_comment(p));
1896                         }
1897                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1898                         if (p != NULL) {
1899                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1900                         }
1901                 }
1902                 icalcomponent_free(cal);
1903                 if (whole_cal != cal) {
1904                         icalcomponent_free(whole_cal);
1905                 }
1906         }
1907 }
1908
1909
1910
1911
1912 /*
1913  * See if we need to prevent the object from being saved (we don't allow
1914  * MIME types other than text/calendar in "calendar" or "tasks"  rooms).  Also,
1915  * when saving an event to the calendar, set the message's Citadel exclusive
1916  * message ID to the UID of the object.  This causes our replication checker to
1917  * automatically delete any existing instances of the same object.  (Isn't
1918  * that cool?)
1919  *
1920  * We also set the message's Subject to the event summary, and the Date/time to
1921  * the event start time.
1922  */
1923 int ical_obj_beforesave(struct CtdlMessage *msg)
1924 {
1925         struct icalmessagemod imm;
1926
1927         /* First determine if this is a calendar or tasks room */
1928         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
1929            && (CC->room.QRdefaultview != VIEW_TASKS)
1930         ) {
1931                 return(0);              /* Not a vCalendar-centric room */
1932         }
1933
1934         /* It must be an RFC822 message! */
1935         if (msg->cm_format_type != 4) {
1936                 lprintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
1937                 return(1);              /* You tried to save a non-RFC822 message! */
1938         }
1939
1940         if (msg->cm_fields['M'] == NULL) {
1941                 return(1);              /* You tried to save a null message! */
1942         }
1943
1944         memset(&imm, 0, sizeof(struct icalmessagemod));
1945
1946         /* Do all of our lovely back-end parsing */
1947         mime_parser(msg->cm_fields['M'],
1948                 NULL,
1949                 *ical_ctdl_set_exclusive_msgid,
1950                 NULL, NULL,
1951                 (void *)&imm,
1952                 0
1953         );
1954
1955         if (strlen(imm.uid) > 0) {
1956                 if (msg->cm_fields['E'] != NULL) {
1957                         free(msg->cm_fields['E']);
1958                 }
1959                 msg->cm_fields['E'] = strdup(imm.uid);
1960                 lprintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", msg->cm_fields['E']);
1961         }
1962         if (strlen(imm.subject) > 0) {
1963                 if (msg->cm_fields['U'] != NULL) {
1964                         free(msg->cm_fields['U']);
1965                 }
1966                 msg->cm_fields['U'] = strdup(imm.subject);
1967         }
1968         if (imm.dtstart > 0) {
1969                 if (msg->cm_fields['T'] != NULL) {
1970                         free(msg->cm_fields['T']);
1971                 }
1972                 msg->cm_fields['T'] = strdup("000000000000000000");
1973                 sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1974         }
1975
1976         return(0);
1977 }
1978
1979
1980 /*
1981  * Things we need to do after saving a calendar event.
1982  */
1983 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1984                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1985                 char *encoding, void *cbuserdata)
1986 {
1987         icalcomponent *cal;
1988
1989         /* We're only interested in calendar items here. */
1990         if (strcasecmp(cbtype, "text/calendar")) {
1991                 return;
1992         }
1993
1994         /* Hunt for the UID and drop it in
1995          * the "user data" pointer for the MIME parser.  When
1996          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1997          * to that string.
1998          */
1999         if (!strcasecmp(cbtype, "text/calendar")) {
2000                 cal = icalcomponent_new_from_string(content);
2001                 if (cal != NULL) {
2002                         ical_saving_vevent(cal);
2003                         icalcomponent_free(cal);
2004                 }
2005         }
2006 }
2007
2008
2009 /*
2010  * Things we need to do after saving a calendar event.
2011  * (This will start back end tasks such as automatic generation of invitations,
2012  * if such actions are appropriate.)
2013  */
2014 int ical_obj_aftersave(struct CtdlMessage *msg)
2015 {
2016         char roomname[ROOMNAMELEN];
2017
2018         /*
2019          * If this isn't the Calendar> room, no further action is necessary.
2020          */
2021
2022         /* First determine if this is our room */
2023         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2024         if (strcasecmp(roomname, CC->room.QRname)) {
2025                 return(0);      /* Not the Calendar room -- don't do anything. */
2026         }
2027
2028         /* It must be an RFC822 message! */
2029         if (msg->cm_format_type != 4) return(1);
2030
2031         /* Reject null messages */
2032         if (msg->cm_fields['M'] == NULL) return(1);
2033
2034         /* Now recurse through it looking for our icalendar data */
2035         mime_parser(msg->cm_fields['M'],
2036                 NULL,
2037                 *ical_obj_aftersave_backend,
2038                 NULL, NULL,
2039                 NULL,
2040                 0
2041         );
2042
2043         return(0);
2044 }
2045
2046
2047 void ical_session_startup(void) {
2048         CIT_ICAL = malloc(sizeof(struct cit_ical));
2049         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2050 }
2051
2052 void ical_session_shutdown(void) {
2053         free(CIT_ICAL);
2054 }
2055
2056
2057 /*
2058  * Back end for ical_fixed_output()
2059  */
2060 void ical_fixed_output_backend(icalcomponent *cal,
2061                         int recursion_level
2062 ) {
2063         icalcomponent *c;
2064         icalproperty *p;
2065         char buf[256];
2066
2067         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2068         if (p != NULL) {
2069                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2070         }
2071
2072         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2073         if (p != NULL) {
2074                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2075         }
2076
2077         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2078         if (p != NULL) {
2079                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2080         }
2081
2082         /* If the component has attendees, iterate through them. */
2083         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2084                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2085                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2086
2087                         /* screen name or email address */
2088                         strcpy(buf, &buf[7]);
2089                         striplt(buf);
2090                         cprintf("%s ", buf);
2091                 }
2092                 cprintf("\n");
2093         }
2094
2095         /* If the component has subcomponents, recurse through them. */
2096         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2097             (c != 0);
2098             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2099                 /* Recursively process subcomponent */
2100                 ical_fixed_output_backend(c, recursion_level+1);
2101         }
2102 }
2103
2104
2105
2106 /*
2107  * Function to output vcalendar data as plain text.  Nobody uses MSG0
2108  * anymore, so really this is just so we expose the vCard data to the full
2109  * text indexer.
2110  */
2111 void ical_fixed_output(char *ptr, int len) {
2112         icalcomponent *cal;
2113         char *stringy_cal;
2114
2115         stringy_cal = malloc(len + 1);
2116         safestrncpy(stringy_cal, ptr, len + 1);
2117         cal = icalcomponent_new_from_string(stringy_cal);
2118         free(stringy_cal);
2119
2120         if (cal == NULL) {
2121                 return;
2122         }
2123
2124         ical_dezonify(cal);
2125         ical_fixed_output_backend(cal, 0);
2126
2127         /* Free the memory we obtained from libical's constructor */
2128         icalcomponent_free(cal);
2129 }
2130
2131
2132 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
2133
2134 /*
2135  * Register this module with the Citadel server.
2136  */
2137 char *serv_calendar_init(void)
2138 {
2139 #ifdef CITADEL_WITH_CALENDAR_SERVICE
2140         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2141         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2142         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2143         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2144         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2145         CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2146         CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2147 #endif
2148         return "$Id$";
2149 }
2150
2151
2152
2153 void serv_calendar_destroy(void)
2154 {
2155 #ifdef CITADEL_WITH_CALENDAR_SERVICE
2156         icaltimezone_free_builtin_timezones();
2157 #endif
2158 }