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                         "",
 318                         summary_string,         /* Use summary for subject */
 319                         NULL,
 320                         reply_message_text);
 321
 322                 if (msg != NULL) {
 323                         valid = validate_recipients(organizer_string);
 324                         CtdlSubmitMsg(msg, valid, "");
 325                         CtdlFreeMessage(msg);
 326                         free (valid);
 327                 }
 328         }
 329         free(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, char *cbcharset, 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 = NULL;
 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, 1);
 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->room.QRname, &msgnum, 1, "");
 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 + ROOM_NOT_FOUND);
 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, char *cbcharset, 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                                 icalcomponent_remove_property(event, e_attendee);
 570                                 icalproperty_free(e_attendee);
 571                                 icalcomponent_remove_property(reply, r_attendee);
 572                                 icalcomponent_add_property(event, r_attendee);
 573
 574                                 /* Since we diddled both sets of attendees, we have to start
 575                                  * the iteration over again.  This will not create an infinite
 576                                  * loop because we removed the attendee from the reply.  (That's
 577                                  * why we cloned the reply, and that's what we mean by "ripping
 578                                  * its guts out.")
 579                                  */
 580                                 goto STARTOVER;
 581                         }
 582
 583                 }
 584         }
 585
 586         /* Free the *clone* of the reply. */
 587         icalcomponent_free(reply);
 588 }
 589
 590
 591
 592
 593 /*
 594  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 595  * calendar event.  The object has already been deserialized for us; all
 596  * we have to do here is hunt for the event in our calendar, merge in the
 597  * updated attendee status, and save it again.
 598  *
 599  * This function returns 0 on success, 1 if the event was not found in the
 600  * user's calendar, or 2 if an internal error occurred.
 601  */
 602 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 603         char uid[SIZ];
 604         char hold_rm[ROOMNAMELEN];
 605         long msgnum_being_replaced = 0;
 606         struct CtdlMessage *msg = NULL;
 607         struct original_event_container oec;
 608         icalcomponent *original_event;
 609         char *serialized_event = NULL;
 610         char roomname[ROOMNAMELEN];
 611         char *message_text = NULL;
 612
 613         /* Figure out just what event it is we're dealing with */
 614         strcpy(uid, "--==<< InVaLiD uId >>==--");
 615         ical_learn_uid_of_reply(uid, cal);
 616         lprintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 617
 618         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 619
 620         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 621                 getroom(&CC->room, hold_rm);
 622                 lprintf(CTDL_CRIT, "cannot get user calendar room\n");
 623                 return(2);
 624         }
 625
 626         /*
 627          * Look in the EUID index for a message with
 628          * the Citadel EUID set to the value we're looking for.  Since
 629          * Citadel always sets the message EUID to the vCalendar UID of
 630          * the event, this will work.
 631          */
 632         msgnum_being_replaced = locate_message_by_euid(uid, &CC->room);
 633
 634         getroom(&CC->room, hold_rm);    /* return to saved room */
 635
 636         lprintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 637         if (msgnum_being_replaced == 0) {
 638                 return(1);                      /* no calendar event found */
 639         }
 640
 641         /* Now we know the ID of the message containing the event being updated.
 642          * We don't actually have to delete it; that'll get taken care of by the
 643          * server when we save another event with the same UID.  This just gives
 644          * us the ability to load the event into memory so we can diddle the
 645          * attendees.
 646          */
 647         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 648         if (msg == NULL) {
 649                 return(2);                      /* internal error */
 650         }
 651         oec.c = NULL;
 652         mime_parser(msg->cm_fields['M'],
 653                 NULL,
 654                 *ical_locate_original_event,    /* callback function */
 655                 NULL, NULL,
 656                 &oec,                           /* user data */
 657                 0
 658         );
 659         CtdlFreeMessage(msg);
 660
 661         original_event = oec.c;
 662         if (original_event == NULL) {
 663                 lprintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 664                 return(2);
 665         }
 666
 667         /* Merge the attendee's updated status into the event */
 668         ical_merge_attendee_reply(original_event, cal);
 669
 670         /* Serialize it */
 671         serialized_event = strdup(icalcomponent_as_ical_string(original_event));
 672         icalcomponent_free(original_event);     /* Don't need this anymore. */
 673         if (serialized_event == NULL) return(2);
 674
 675         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 676
 677         message_text = malloc(strlen(serialized_event) + SIZ);
 678         if (message_text != NULL) {
 679                 sprintf(message_text,
 680                         "Content-type: text/calendar charset=\"utf-8\"\r\n\r\n%s\r\n",
 681                         serialized_event
 682                 );
 683
 684                 msg = CtdlMakeMessage(&CC->user,
 685                         "",                     /* No recipient */
 686                         "",                     /* No recipient */
 687                         roomname,
 688                         0, FMT_RFC822,
 689                         "",
 690                         "",
 691                         "",             /* no subject */
 692                         NULL,
 693                         message_text);
 694
 695                 if (msg != NULL) {
 696                         CIT_ICAL->avoid_sending_invitations = 1;
 697                         CtdlSubmitMsg(msg, NULL, roomname);
 698                         CtdlFreeMessage(msg);
 699                         CIT_ICAL->avoid_sending_invitations = 0;
 700                 }
 701         }
 702         free(serialized_event);
 703         return(0);
 704 }
 705
 706
 707 /*
 708  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 709  * simply extracts the calendar object from the message, deserializes it, and
 710  * passes it up to ical_update_my_calendar_with_reply() for processing.
 711  */
 712 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 713         struct CtdlMessage *msg = NULL;
 714         struct ical_respond_data ird;
 715         int ret;
 716
 717         if (
 718            (strcasecmp(action, "update"))
 719            && (strcasecmp(action, "ignore"))
 720         ) {
 721                 cprintf("%d Action must be 'update' or 'ignore'\n",
 722                         ERROR + ILLEGAL_VALUE
 723                 );
 724                 return;
 725         }
 726
 727         msg = CtdlFetchMessage(msgnum, 1);
 728         if (msg == NULL) {
 729                 cprintf("%d Message %ld not found.\n",
 730                         ERROR + ILLEGAL_VALUE,
 731                         (long)msgnum
 732                 );
 733                 return;
 734         }
 735
 736         memset(&ird, 0, sizeof ird);
 737         strcpy(ird.desired_partnum, partnum);
 738         mime_parser(msg->cm_fields['M'],
 739                 NULL,
 740                 *ical_locate_part,              /* callback function */
 741                 NULL, NULL,
 742                 (void *) &ird,                  /* user data */
 743                 0
 744         );
 745
 746         /* We're done with the incoming message, because we now have a
 747          * calendar object in memory.
 748          */
 749         CtdlFreeMessage(msg);
 750
 751         /*
 752          * Here is the real meat of this function.  Handle the event.
 753          */
 754         if (ird.cal != NULL) {
 755                 /* Update the user's calendar if necessary */
 756                 if (!strcasecmp(action, "update")) {
 757                         ret = ical_update_my_calendar_with_reply(ird.cal);
 758                         if (ret == 0) {
 759                                 cprintf("%d Your calendar has been updated with this reply.\n",
 760                                         CIT_OK);
 761                         }
 762                         else if (ret == 1) {
 763                                 cprintf("%d This event does not exist in your calendar.\n",
 764                                         ERROR + FILE_NOT_FOUND);
 765                         }
 766                         else {
 767                                 cprintf("%d An internal error occurred.\n",
 768                                         ERROR + INTERNAL_ERROR);
 769                         }
 770                 }
 771                 else {
 772                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 773                 }
 774
 775                 /* Now that we've processed this message, we don't need it
 776                  * anymore.  So delete it.  (Maybe make this optional?)
 777                  */
 778                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 779
 780                 /* Free the memory we allocated and return a response. */
 781                 icalcomponent_free(ird.cal);
 782                 ird.cal = NULL;
 783                 return;
 784         }
 785         else {
 786                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 787                 return;
 788         }
 789
 790         /* should never get here */
 791 }
 792
 793
 794 /*
 795  * Search for a property in both the top level and in a VEVENT subcomponent
 796  */
 797 icalproperty *ical_ctdl_get_subprop(
 798                 icalcomponent *cal,
 799                 icalproperty_kind which_prop
 800 ) {
 801         icalproperty *p;
 802         icalcomponent *c;
 803
 804         p = icalcomponent_get_first_property(cal, which_prop);
 805         if (p == NULL) {
 806                 c = icalcomponent_get_first_component(cal,
 807                                                         ICAL_VEVENT_COMPONENT);
 808                 if (c != NULL) {
 809                         p = icalcomponent_get_first_property(c, which_prop);
 810                 }
 811         }
 812         return p;
 813 }
 814
 815
 816 /*
 817  * Check to see if two events overlap.  Returns nonzero if they do.
 818  * (This function is used in both Citadel and WebCit.  If you change it in
 819  * one place, change it in the other.  Better yet, put it in a library.)
 820  */
 821 int ical_ctdl_is_overlap(
 822                         struct icaltimetype t1start,
 823                         struct icaltimetype t1end,
 824                         struct icaltimetype t2start,
 825                         struct icaltimetype t2end
 826 ) {
 827
 828         if (icaltime_is_null_time(t1start)) return(0);
 829         if (icaltime_is_null_time(t2start)) return(0);
 830
 831         /* First, check for all-day events */
 832         if (t1start.is_date) {
 833                 if (!icaltime_compare_date_only(t1start, t2start)) {
 834                         return(1);
 835                 }
 836                 if (!icaltime_is_null_time(t2end)) {
 837                         if (!icaltime_compare_date_only(t1start, t2end)) {
 838                                 return(1);
 839                         }
 840                 }
 841         }
 842
 843         if (t2start.is_date) {
 844                 if (!icaltime_compare_date_only(t2start, t1start)) {
 845                         return(1);
 846                 }
 847                 if (!icaltime_is_null_time(t1end)) {
 848                         if (!icaltime_compare_date_only(t2start, t1end)) {
 849                                 return(1);
 850                         }
 851                 }
 852         }
 853
 854         /* Now check for overlaps using date *and* time. */
 855
 856         /* First, bail out if either event 1 or event 2 is missing end time. */
 857         if (icaltime_is_null_time(t1end)) return(0);
 858         if (icaltime_is_null_time(t2end)) return(0);
 859
 860         /* If event 1 ends before event 2 starts, we're in the clear. */
 861         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 862
 863         /* If event 2 ends before event 1 starts, we're also ok. */
 864         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 865
 866         /* Otherwise, they overlap. */
 867         return(1);
 868 }
 869
 870
 871
 872 /*
 873  * Backend for ical_hunt_for_conflicts()
 874  */
 875 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 876         icalcomponent *cal;
 877         struct CtdlMessage *msg = NULL;
 878         struct ical_respond_data ird;
 879         struct icaltimetype t1start, t1end, t2start, t2end;
 880         icalproperty *p;
 881         char conflict_event_uid[SIZ];
 882         char conflict_event_summary[SIZ];
 883         char compare_uid[SIZ];
 884
 885         cal = (icalcomponent *)data;
 886         strcpy(compare_uid, "");
 887         strcpy(conflict_event_uid, "");
 888         strcpy(conflict_event_summary, "");
 889
 890         msg = CtdlFetchMessage(msgnum, 1);
 891         if (msg == NULL) return;
 892         memset(&ird, 0, sizeof ird);
 893         strcpy(ird.desired_partnum, "_HUNT_");
 894         mime_parser(msg->cm_fields['M'],
 895                 NULL,
 896                 *ical_locate_part,              /* callback function */
 897                 NULL, NULL,
 898                 (void *) &ird,                  /* user data */
 899                 0
 900         );
 901         CtdlFreeMessage(msg);
 902
 903         if (ird.cal == NULL) return;
 904
 905         t1start = icaltime_null_time();
 906         t1end = icaltime_null_time();
 907         t2start = icaltime_null_time();
 908         t1end = icaltime_null_time();
 909
 910         /* Now compare cal to ird.cal */
 911         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 912         if (p == NULL) return;
 913         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 914
 915         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 916         if (p != NULL) t2end = icalproperty_get_dtend(p);
 917
 918         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 919         if (p == NULL) return;
 920         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 921
 922         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 923         if (p != NULL) t1end = icalproperty_get_dtend(p);
 924
 925         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 926         if (p != NULL) {
 927                 strcpy(compare_uid, icalproperty_get_comment(p));
 928         }
 929
 930         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 931         if (p != NULL) {
 932                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 933         }
 934
 935         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 936         if (p != NULL) {
 937                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 938         }
 939
 940         icalcomponent_free(ird.cal);
 941
 942         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 943                 cprintf("%ld||%s|%s|%d|\n",
 944                         msgnum,
 945                         conflict_event_uid,
 946                         conflict_event_summary,
 947                         (       ((strlen(compare_uid)>0)
 948                                 &&(!strcasecmp(compare_uid,
 949                                 conflict_event_uid))) ? 1 : 0
 950                         )
 951                 );
 952         }
 953 }
 954
 955
 956
 957 /*
 958  * Phase 2 of "hunt for conflicts" operation.
 959  * At this point we have a calendar object which represents the VEVENT that
 960  * we're considering adding to the calendar.  Now hunt through the user's
 961  * calendar room, and output zero or more existing VEVENTs which conflict
 962  * with this one.
 963  */
 964 void ical_hunt_for_conflicts(icalcomponent *cal) {
 965         char hold_rm[ROOMNAMELEN];
 966
 967         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 968
 969         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 970                 getroom(&CC->room, hold_rm);
 971                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
 972                 return;
 973         }
 974
 975         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 976
 977         CtdlForEachMessage(MSGS_ALL, 0, NULL,
 978                 NULL,
 979                 NULL,
 980                 ical_hunt_for_conflicts_backend,
 981                 (void *) cal
 982         );
 983
 984         cprintf("000\n");
 985         getroom(&CC->room, hold_rm);    /* return to saved room */
 986
 987 }
 988
 989
 990
 991 /*
 992  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 993  */
 994 void ical_conflicts(long msgnum, char *partnum) {
 995         struct CtdlMessage *msg = NULL;
 996         struct ical_respond_data ird;
 997
 998         msg = CtdlFetchMessage(msgnum, 1);
 999         if (msg == NULL) {
1000                 cprintf("%d Message %ld not found.\n",
1001                         ERROR + ILLEGAL_VALUE,
1002                         (long)msgnum
1003                 );
1004                 return;
1005         }
1006
1007         memset(&ird, 0, sizeof ird);
1008         strcpy(ird.desired_partnum, partnum);
1009         mime_parser(msg->cm_fields['M'],
1010                 NULL,
1011                 *ical_locate_part,              /* callback function */
1012                 NULL, NULL,
1013                 (void *) &ird,                  /* user data */
1014                 0
1015         );
1016
1017         CtdlFreeMessage(msg);
1018
1019         if (ird.cal != NULL) {
1020                 ical_hunt_for_conflicts(ird.cal);
1021                 icalcomponent_free(ird.cal);
1022                 return;
1023         }
1024         else {
1025                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1026                 return;
1027         }
1028
1029         /* should never get here */
1030 }
1031
1032
1033
1034 /*
1035  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1036  */
1037 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1038         icalproperty *p;
1039         icalvalue *v;
1040         struct icalperiodtype my_period;
1041
1042         if (cal == NULL) return;
1043         my_period = icalperiodtype_null_period();
1044
1045         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1046                 ical_add_to_freebusy(fb,
1047                         icalcomponent_get_first_component(
1048                                 cal, ICAL_VEVENT_COMPONENT
1049                         )
1050                 );
1051                 return;
1052         }
1053
1054         ical_dezonify(cal);
1055
1056         /* If this event is not opaque, the user isn't publishing it as
1057          * busy time, so don't bother doing anything else.
1058          */
1059         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1060         if (p != NULL) {
1061                 v = icalproperty_get_value(p);
1062                 if (v != NULL) {
1063                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1064                                 return;
1065                         }
1066                 }
1067         }
1068
1069         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1070         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1071         if (p != NULL) {
1072                 my_period.start = icalproperty_get_dtstart(p);
1073         }
1074
1075         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1076         if (p != NULL) {
1077                 my_period.end = icalproperty_get_dtstart(p);
1078         }
1079
1080         /* Now add it. */
1081         icalcomponent_add_property(fb,
1082                 icalproperty_new_freebusy(my_period)
1083         );
1084
1085         /* Make sure the DTSTART property of the freebusy *list* is set to
1086          * the DTSTART property of the *earliest event*.
1087          */
1088         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1089         if (p == NULL) {
1090                 icalcomponent_set_dtstart(fb,
1091                         icalcomponent_get_dtstart(cal) );
1092         }
1093         else {
1094                 if (icaltime_compare(
1095                         icalcomponent_get_dtstart(cal),
1096                         icalcomponent_get_dtstart(fb)
1097                    ) < 0) {
1098                         icalcomponent_set_dtstart(fb,
1099                                 icalcomponent_get_dtstart(cal) );
1100                 }
1101         }
1102
1103         /* Make sure the DTEND property of the freebusy *list* is set to
1104          * the DTEND property of the *latest event*.
1105          */
1106         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1107         if (p == NULL) {
1108                 icalcomponent_set_dtend(fb,
1109                         icalcomponent_get_dtend(cal) );
1110         }
1111         else {
1112                 if (icaltime_compare(
1113                         icalcomponent_get_dtend(cal),
1114                         icalcomponent_get_dtend(fb)
1115                    ) > 0) {
1116                         icalcomponent_set_dtend(fb,
1117                                 icalcomponent_get_dtend(cal) );
1118                 }
1119         }
1120
1121 }
1122
1123
1124
1125 /*
1126  * Backend for ical_freebusy()
1127  *
1128  * This function simply loads the messages in the user's calendar room,
1129  * which contain VEVENTs, then strips them of all non-freebusy data, and
1130  * adds them to the supplied VCALENDAR.
1131  *
1132  */
1133 void ical_freebusy_backend(long msgnum, void *data) {
1134         icalcomponent *cal;
1135         struct CtdlMessage *msg = NULL;
1136         struct ical_respond_data ird;
1137
1138         cal = (icalcomponent *)data;
1139
1140         msg = CtdlFetchMessage(msgnum, 1);
1141         if (msg == NULL) return;
1142         memset(&ird, 0, sizeof ird);
1143         strcpy(ird.desired_partnum, "_HUNT_");
1144         mime_parser(msg->cm_fields['M'],
1145                 NULL,
1146                 *ical_locate_part,              /* callback function */
1147                 NULL, NULL,
1148                 (void *) &ird,                  /* user data */
1149                 0
1150         );
1151         CtdlFreeMessage(msg);
1152
1153         if (ird.cal == NULL) return;
1154
1155         ical_add_to_freebusy(cal, ird.cal);
1156
1157         /* Now free the memory. */
1158         icalcomponent_free(ird.cal);
1159 }
1160
1161
1162
1163 /*
1164  * Grab another user's free/busy times
1165  */
1166 void ical_freebusy(char *who) {
1167         struct ctdluser usbuf;
1168         char calendar_room_name[ROOMNAMELEN];
1169         char hold_rm[ROOMNAMELEN];
1170         char *serialized_request = NULL;
1171         icalcomponent *encaps = NULL;
1172         icalcomponent *fb = NULL;
1173         int found_user = (-1);
1174         struct recptypes *recp = NULL;
1175         char buf[256];
1176         char host[256];
1177         char type[256];
1178         int i = 0;
1179         int config_lines = 0;
1180
1181         /* First try an exact match. */
1182         found_user = getuser(&usbuf, who);
1183
1184         /* If not found, try it as an unqualified email address. */
1185         if (found_user != 0) {
1186                 strcpy(buf, who);
1187                 recp = validate_recipients(buf);
1188                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1189                 if (recp != NULL) {
1190                         if (recp->num_local == 1) {
1191                                 found_user = getuser(&usbuf, recp->recp_local);
1192                         }
1193                         free(recp);
1194                 }
1195         }
1196
1197         /* If still not found, try it as an address qualified with the
1198          * primary FQDN of this Citadel node.
1199          */
1200         if (found_user != 0) {
1201                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1202                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1203                 recp = validate_recipients(buf);
1204                 if (recp != NULL) {
1205                         if (recp->num_local == 1) {
1206                                 found_user = getuser(&usbuf, recp->recp_local);
1207                         }
1208                         free(recp);
1209                 }
1210         }
1211
1212         /* Still not found?  Try qualifying it with every domain we
1213          * might have addresses in.
1214          */
1215         if (found_user != 0) {
1216                 config_lines = num_tokens(inetcfg, '\n');
1217                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1218                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1219                         extract_token(host, buf, 0, '|', sizeof host);
1220                         extract_token(type, buf, 1, '|', sizeof type);
1221
1222                         if ( (!strcasecmp(type, "localhost"))
1223                            || (!strcasecmp(type, "directory")) ) {
1224                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1225                                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1226                                 recp = validate_recipients(buf);
1227                                 if (recp != NULL) {
1228                                         if (recp->num_local == 1) {
1229                                                 found_user = getuser(&usbuf, recp->recp_local);
1230                                         }
1231                                         free(recp);
1232                                 }
1233                         }
1234                 }
1235         }
1236
1237         if (found_user != 0) {
1238                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1239                 return;
1240         }
1241
1242         MailboxName(calendar_room_name, sizeof calendar_room_name,
1243                 &usbuf, USERCALENDARROOM);
1244
1245         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1246
1247         if (getroom(&CC->room, calendar_room_name) != 0) {
1248                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1249                 getroom(&CC->room, hold_rm);
1250                 return;
1251         }
1252
1253         /* Create a VFREEBUSY subcomponent */
1254         lprintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1255         fb = icalcomponent_new_vfreebusy();
1256         if (fb == NULL) {
1257                 cprintf("%d Internal error: cannot allocate memory.\n",
1258                         ERROR + INTERNAL_ERROR);
1259                 icalcomponent_free(encaps);
1260                 getroom(&CC->room, hold_rm);
1261                 return;
1262         }
1263
1264         /* Set the method to PUBLISH */
1265         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1266
1267         /* Set the DTSTAMP to right now. */
1268         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1269
1270         /* Add the user's email address as ORGANIZER */
1271         sprintf(buf, "MAILTO:%s", who);
1272         if (strchr(buf, '@') == NULL) {
1273                 strcat(buf, "@");
1274                 strcat(buf, config.c_fqdn);
1275         }
1276         for (i=0; i<strlen(buf); ++i) {
1277                 if (buf[i]==' ') buf[i] = '_';
1278         }
1279         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1280
1281         /* Add busy time from events */
1282         lprintf(CTDL_DEBUG, "Adding busy time from events\n");
1283         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1284
1285         /* If values for DTSTART and DTEND are still not present, set them
1286          * to yesterday and tomorrow as default values.
1287          */
1288         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1289                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1290         }
1291         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1292                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1293         }
1294
1295         /* Put the freebusy component into the calendar component */
1296         lprintf(CTDL_DEBUG, "Encapsulating\n");
1297         encaps = ical_encapsulate_subcomponent(fb);
1298         if (encaps == NULL) {
1299                 icalcomponent_free(fb);
1300                 cprintf("%d Internal error: cannot allocate memory.\n",
1301                         ERROR + INTERNAL_ERROR);
1302                 getroom(&CC->room, hold_rm);
1303                 return;
1304         }
1305
1306         /* Set the method to PUBLISH */
1307         lprintf(CTDL_DEBUG, "Setting method\n");
1308         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1309
1310         /* Serialize it */
1311         lprintf(CTDL_DEBUG, "Serializing\n");
1312         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1313         icalcomponent_free(encaps);     /* Don't need this anymore. */
1314
1315         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1316         if (serialized_request != NULL) {
1317                 client_write(serialized_request, strlen(serialized_request));
1318                 free(serialized_request);
1319         }
1320         cprintf("\n000\n");
1321
1322         /* Go back to the room from which we came... */
1323         getroom(&CC->room, hold_rm);
1324 }
1325
1326
1327
1328 /*
1329  * Backend for ical_getics()
1330  *
1331  * This is a ForEachMessage() callback function that searches the current room
1332  * for calendar events and adds them each into one big calendar component.
1333  */
1334 void ical_getics_backend(long msgnum, void *data) {
1335         icalcomponent *encaps, *c;
1336         struct CtdlMessage *msg = NULL;
1337         struct ical_respond_data ird;
1338
1339         encaps = (icalcomponent *)data;
1340         if (encaps == NULL) return;
1341
1342         /* Look for the calendar event... */
1343
1344         msg = CtdlFetchMessage(msgnum, 1);
1345         if (msg == NULL) return;
1346         memset(&ird, 0, sizeof ird);
1347         strcpy(ird.desired_partnum, "_HUNT_");
1348         mime_parser(msg->cm_fields['M'],
1349                 NULL,
1350                 *ical_locate_part,              /* callback function */
1351                 NULL, NULL,
1352                 (void *) &ird,                  /* user data */
1353                 0
1354         );
1355         CtdlFreeMessage(msg);
1356
1357         if (ird.cal == NULL) return;
1358
1359         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1360          * are responsible for "the_request"'s memory -- it will be freed
1361          * when we free "encaps".
1362          */
1363
1364         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1365          * in.  This will almost never happen.
1366          */
1367         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1368                 icalcomponent_add_component(encaps, ird.cal);
1369         }
1370         /*
1371          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1372          * and other components encapsulated inside, we have to extract them.
1373          */
1374         else {
1375                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1376                     (c != NULL);
1377                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1378                         icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1379                 }
1380                 icalcomponent_free(ird.cal);
1381         }
1382 }
1383
1384
1385
1386 /*
1387  * Retrieve all of the calendar items in the current room, and output them
1388  * as a single icalendar object.
1389  */
1390 void ical_getics(void)
1391 {
1392         icalcomponent *encaps = NULL;
1393         char *ser = NULL;
1394
1395         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1396            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1397                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1398                 return;         /* Not a vCalendar-centric room */
1399         }
1400
1401         encaps = icalcomponent_new_vcalendar();
1402         if (encaps == NULL) {
1403                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1404                         __FILE__, __LINE__);
1405                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1406                 return;
1407         }
1408
1409         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1410
1411         /* Set the Product ID */
1412         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1413
1414         /* Set the Version Number */
1415         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1416
1417         /* Set the method to PUBLISH */
1418         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1419
1420         /* Now go through the room encapsulating all calendar items. */
1421         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1422                 NULL,
1423                 NULL,
1424                 ical_getics_backend,
1425                 (void *) encaps
1426         );
1427
1428         ser = strdup(icalcomponent_as_ical_string(encaps));
1429         client_write(ser, strlen(ser));
1430         free(ser);
1431         cprintf("\n000\n");
1432         icalcomponent_free(encaps);     /* Don't need this anymore. */
1433
1434 }
1435
1436
1437 /*
1438  * Delete all of the calendar items in the current room, and replace them
1439  * with calendar items from a client-supplied data stream.
1440  */
1441 void ical_putics(void)
1442 {
1443         char *calstream = NULL;
1444         icalcomponent *cal;
1445         icalcomponent *c;
1446
1447         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1448            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1449                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1450                 return;         /* Not a vCalendar-centric room */
1451         }
1452
1453         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1454                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1455                 return;
1456         }
1457
1458         cprintf("%d Transmit data now\n", SEND_LISTING);
1459         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0);
1460         if (calstream == NULL) {
1461                 return;
1462         }
1463
1464         cal = icalcomponent_new_from_string(calstream);
1465         free(calstream);
1466         ical_dezonify(cal);
1467
1468         /* We got our data stream -- now do something with it. */
1469
1470         /* Delete the existing messages in the room, because we are replacing
1471          * the entire calendar with an entire new (or updated) calendar.
1472          * (Careful: this opens an S_ROOMS critical section!)
1473          */
1474         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1475
1476         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1477          * in.  This will almost never happen.
1478          */
1479         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1480                 ical_write_to_cal(&CC->user, cal);
1481         }
1482         /*
1483          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1484          * and other components encapsulated inside, we have to extract them.
1485          */
1486         else {
1487                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1488                     (c != NULL);
1489                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1490                         ical_write_to_cal(&CC->user, c);
1491                 }
1492         }
1493
1494         icalcomponent_free(cal);
1495 }
1496
1497
1498 /*
1499  * All Citadel calendar commands from the client come through here.
1500  */
1501 void cmd_ical(char *argbuf)
1502 {
1503         char subcmd[64];
1504         long msgnum;
1505         char partnum[256];
1506         char action[256];
1507         char who[256];
1508
1509         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1510
1511         /* Allow "test" and "freebusy" subcommands without logging in. */
1512
1513         if (!strcasecmp(subcmd, "test")) {
1514                 cprintf("%d This server supports calendaring\n", CIT_OK);
1515                 return;
1516         }
1517
1518         if (!strcasecmp(subcmd, "freebusy")) {
1519                 extract_token(who, argbuf, 1, '|', sizeof who);
1520                 ical_freebusy(who);
1521                 return;
1522         }
1523
1524         if (!strcasecmp(subcmd, "sgi")) {
1525                 CIT_ICAL->server_generated_invitations =
1526                         (extract_int(argbuf, 1) ? 1 : 0) ;
1527                 cprintf("%d %d\n",
1528                         CIT_OK, CIT_ICAL->server_generated_invitations);
1529                 return;
1530         }
1531
1532         if (CtdlAccessCheck(ac_logged_in)) return;
1533
1534         if (!strcasecmp(subcmd, "respond")) {
1535                 msgnum = extract_long(argbuf, 1);
1536                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1537                 extract_token(action, argbuf, 3, '|', sizeof action);
1538                 ical_respond(msgnum, partnum, action);
1539                 return;
1540         }
1541
1542         if (!strcasecmp(subcmd, "handle_rsvp")) {
1543                 msgnum = extract_long(argbuf, 1);
1544                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1545                 extract_token(action, argbuf, 3, '|', sizeof action);
1546                 ical_handle_rsvp(msgnum, partnum, action);
1547                 return;
1548         }
1549
1550         if (!strcasecmp(subcmd, "conflicts")) {
1551                 msgnum = extract_long(argbuf, 1);
1552                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1553                 ical_conflicts(msgnum, partnum);
1554                 return;
1555         }
1556
1557         if (!strcasecmp(subcmd, "getics")) {
1558                 ical_getics();
1559                 return;
1560         }
1561
1562         if (!strcasecmp(subcmd, "putics")) {
1563                 ical_putics();
1564                 return;
1565         }
1566
1567         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1568 }
1569
1570
1571
1572 /*
1573  * We don't know if the calendar room exists so we just create it at login
1574  */
1575 void ical_create_room(void)
1576 {
1577         struct ctdlroom qr;
1578         struct visit vbuf;
1579
1580         /* Create the calendar room if it doesn't already exist */
1581         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1582
1583         /* Set expiration policy to manual; otherwise objects will be lost! */
1584         if (lgetroom(&qr, USERCALENDARROOM)) {
1585                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1586                 return;
1587         }
1588         qr.QRep.expire_mode = EXPIRE_MANUAL;
1589         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1590         lputroom(&qr);
1591
1592         /* Set the view to a calendar view */
1593         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1594         vbuf.v_view = VIEW_CALENDAR;
1595         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1596
1597         /* Create the tasks list room if it doesn't already exist */
1598         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1599
1600         /* Set expiration policy to manual; otherwise objects will be lost! */
1601         if (lgetroom(&qr, USERTASKSROOM)) {
1602                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1603                 return;
1604         }
1605         qr.QRep.expire_mode = EXPIRE_MANUAL;
1606         qr.QRdefaultview = VIEW_TASKS;
1607         lputroom(&qr);
1608
1609         /* Set the view to a task list view */
1610         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1611         vbuf.v_view = VIEW_TASKS;
1612         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1613
1614         /* Create the notes room if it doesn't already exist */
1615         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1616
1617         /* Set expiration policy to manual; otherwise objects will be lost! */
1618         if (lgetroom(&qr, USERNOTESROOM)) {
1619                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1620                 return;
1621         }
1622         qr.QRep.expire_mode = EXPIRE_MANUAL;
1623         qr.QRdefaultview = VIEW_NOTES;
1624         lputroom(&qr);
1625
1626         /* Set the view to a notes view */
1627         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1628         vbuf.v_view = VIEW_NOTES;
1629         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1630
1631         return;
1632 }
1633
1634
1635 /*
1636  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1637  * finds a VEVENT.
1638  */
1639 void ical_send_out_invitations(icalcomponent *cal) {
1640         icalcomponent *the_request = NULL;
1641         char *serialized_request = NULL;
1642         icalcomponent *encaps = NULL;
1643         char *request_message_text = NULL;
1644         struct CtdlMessage *msg = NULL;
1645         struct recptypes *valid = NULL;
1646         char attendees_string[SIZ];
1647         int num_attendees = 0;
1648         char this_attendee[256];
1649         icalproperty *attendee = NULL;
1650         char summary_string[SIZ];
1651         icalproperty *summary = NULL;
1652
1653         if (cal == NULL) {
1654                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1655                 return;
1656         }
1657
1658
1659         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1660         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1661                 ical_send_out_invitations(
1662                         icalcomponent_get_first_component(
1663                                 cal, ICAL_VEVENT_COMPONENT
1664                         )
1665                 );
1666                 return;
1667         }
1668
1669         /* Clone the event */
1670         the_request = icalcomponent_new_clone(cal);
1671         if (the_request == NULL) {
1672                 lprintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1673                 return;
1674         }
1675
1676         /* Extract the summary string -- we'll use it as the
1677          * message subject for the request
1678          */
1679         strcpy(summary_string, "Meeting request");
1680         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1681         if (summary != NULL) {
1682                 if (icalproperty_get_summary(summary)) {
1683                         strcpy(summary_string,
1684                                 icalproperty_get_summary(summary) );
1685                 }
1686         }
1687
1688         /* Determine who the recipients of this message are (the attendees) */
1689         strcpy(attendees_string, "");
1690         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1691                 if (icalproperty_get_attendee(attendee)) {
1692                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1693                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1694                                 strcpy(this_attendee, &this_attendee[7]);
1695
1696                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1697                                         snprintf(&attendees_string[strlen(attendees_string)],
1698                                                 sizeof(attendees_string) - strlen(attendees_string),
1699                                                 "%s, ",
1700                                                 this_attendee
1701                                         );
1702                                         ++num_attendees;
1703                                 }
1704                         }
1705                 }
1706         }
1707
1708         lprintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1709
1710         /* If there are no attendees, there are no invitations to send, so...
1711          * don't bother putting one together!  Punch out, Maverick!
1712          */
1713         if (num_attendees == 0) {
1714                 icalcomponent_free(the_request);
1715                 return;
1716         }
1717
1718         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1719         encaps = icalcomponent_new_vcalendar();
1720         if (encaps == NULL) {
1721                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1722                         __FILE__, __LINE__);
1723                 icalcomponent_free(the_request);
1724                 return;
1725         }
1726
1727         /* Set the Product ID */
1728         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1729
1730         /* Set the Version Number */
1731         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1732
1733         /* Set the method to REQUEST */
1734         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1735
1736         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1737         ical_dezonify(the_request);
1738
1739         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1740          * are responsible for "the_request"'s memory -- it will be freed
1741          * when we free "encaps".
1742          */
1743         icalcomponent_add_component(encaps, the_request);
1744
1745         /* Serialize it */
1746         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1747         icalcomponent_free(encaps);     /* Don't need this anymore. */
1748         if (serialized_request == NULL) return;
1749
1750         request_message_text = malloc(strlen(serialized_request) + SIZ);
1751         if (request_message_text != NULL) {
1752                 sprintf(request_message_text,
1753                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1754                         serialized_request
1755                 );
1756
1757                 msg = CtdlMakeMessage(&CC->user,
1758                         "",                     /* No single recipient here */
1759                         "",                     /* No single recipient here */
1760                         CC->room.QRname, 0, FMT_RFC822,
1761                         "",
1762                         "",
1763                         summary_string,         /* Use summary for subject */
1764                         NULL,
1765                         request_message_text);
1766
1767                 if (msg != NULL) {
1768                         valid = validate_recipients(attendees_string);
1769                         CtdlSubmitMsg(msg, valid, "");
1770                         CtdlFreeMessage(msg);
1771                         free (valid);
1772                 }
1773         }
1774         free(serialized_request);
1775 }
1776
1777
1778 /*
1779  * When a calendar object is being saved, determine whether it's a VEVENT
1780  * and the user saving it is the organizer.  If so, send out invitations
1781  * to any listed attendees.
1782  *
1783  */
1784 void ical_saving_vevent(icalcomponent *cal) {
1785         icalcomponent *c;
1786         icalproperty *organizer = NULL;
1787         char organizer_string[SIZ];
1788
1789         lprintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
1790
1791         /* Don't send out invitations unless the client wants us to. */
1792         if (CIT_ICAL->server_generated_invitations == 0) {
1793                 return;
1794         }
1795
1796         /* Don't send out invitations if we've been asked not to. */
1797         if (CIT_ICAL->avoid_sending_invitations > 0) {
1798                 return;
1799         }
1800
1801         strcpy(organizer_string, "");
1802         /*
1803          * The VEVENT subcomponent is the one we're interested in.
1804          * Send out invitations if, and only if, this user is the Organizer.
1805          */
1806         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1807                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
1808                 if (organizer != NULL) {
1809                         if (icalproperty_get_organizer(organizer)) {
1810                                 strcpy(organizer_string,
1811                                         icalproperty_get_organizer(organizer));
1812                         }
1813                 }
1814                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1815                         strcpy(organizer_string, &organizer_string[7]);
1816                         striplt(organizer_string);
1817                         /*
1818                          * If the user saving the event is listed as the
1819                          * organizer, then send out invitations.
1820                          */
1821                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
1822                                 ical_send_out_invitations(cal);
1823                         }
1824                 }
1825         }
1826
1827         /* If the component has subcomponents, recurse through them. */
1828         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1829             (c != NULL);
1830             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1831                 /* Recursively process subcomponent */
1832                 ical_saving_vevent(c);
1833         }
1834
1835 }
1836
1837
1838
1839 /*
1840  * Back end for ical_obj_beforesave()
1841  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1842  * the summary of the event (becomes message subject),
1843  * and the start time (becomes message date/time).
1844  */
1845 void ical_ctdl_set_exclusive_msgid(char *name, char *filename, char *partnum,
1846                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1847                 char *encoding, void *cbuserdata)
1848 {
1849         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
1850         icalproperty *p;
1851         struct icalmessagemod *imm;
1852         char new_uid[SIZ];
1853
1854         imm = (struct icalmessagemod *)cbuserdata;
1855
1856         /* We're only interested in calendar data. */
1857         if (strcasecmp(cbtype, "text/calendar")) {
1858                 return;
1859         }
1860
1861         /* Hunt for the UID and drop it in
1862          * the "user data" pointer for the MIME parser.  When
1863          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1864          * to that string.
1865          */
1866         whole_cal = icalcomponent_new_from_string(content);
1867         cal = whole_cal;
1868         if (cal != NULL) {
1869                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1870                         nested_event = icalcomponent_get_first_component(
1871                                 cal, ICAL_VEVENT_COMPONENT);
1872                         if (nested_event != NULL) {
1873                                 cal = nested_event;
1874                         }
1875                         else {
1876                                 nested_todo = icalcomponent_get_first_component(
1877                                         cal, ICAL_VTODO_COMPONENT);
1878                                 if (nested_todo != NULL) {
1879                                         cal = nested_todo;
1880                                 }
1881                         }
1882                 }
1883
1884                 if (cal != NULL) {
1885                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1886                         if (p == NULL) {
1887                                 /* If there's no uid we must generate one */
1888                                 generate_uuid(new_uid);
1889                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
1890                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1891                         }
1892                         if (p != NULL) {
1893                                 strcpy(imm->uid, icalproperty_get_comment(p));
1894                         }
1895                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1896                         if (p != NULL) {
1897                                 strcpy(imm->subject, icalproperty_get_comment(p));
1898                         }
1899                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1900                         if (p != NULL) {
1901                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1902                         }
1903                 }
1904                 icalcomponent_free(cal);
1905                 if (whole_cal != cal) {
1906                         icalcomponent_free(whole_cal);
1907                 }
1908         }
1909 }
1910
1911
1912
1913
1914 /*
1915  * See if we need to prevent the object from being saved (we don't allow
1916  * MIME types other than text/calendar in "calendar" or "tasks"  rooms).  Also,
1917  * when saving an event to the calendar, set the message's Citadel exclusive
1918  * message ID to the UID of the object.  This causes our replication checker to
1919  * automatically delete any existing instances of the same object.  (Isn't
1920  * that cool?)
1921  *
1922  * We also set the message's Subject to the event summary, and the Date/time to
1923  * the event start time.
1924  */
1925 int ical_obj_beforesave(struct CtdlMessage *msg)
1926 {
1927         struct icalmessagemod imm;
1928
1929         /* First determine if this is a calendar or tasks room */
1930         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
1931            && (CC->room.QRdefaultview != VIEW_TASKS)
1932         ) {
1933                 return(0);              /* Not a vCalendar-centric room */
1934         }
1935
1936         /* It must be an RFC822 message! */
1937         if (msg->cm_format_type != 4) {
1938                 lprintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
1939                 return(1);              /* You tried to save a non-RFC822 message! */
1940         }
1941
1942         if (msg->cm_fields['M'] == NULL) {
1943                 return(1);              /* You tried to save a null message! */
1944         }
1945
1946         memset(&imm, 0, sizeof(struct icalmessagemod));
1947
1948         /* Do all of our lovely back-end parsing */
1949         mime_parser(msg->cm_fields['M'],
1950                 NULL,
1951                 *ical_ctdl_set_exclusive_msgid,
1952                 NULL, NULL,
1953                 (void *)&imm,
1954                 0
1955         );
1956
1957         if (strlen(imm.uid) > 0) {
1958                 if (msg->cm_fields['E'] != NULL) {
1959                         free(msg->cm_fields['E']);
1960                 }
1961                 msg->cm_fields['E'] = strdup(imm.uid);
1962                 lprintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", msg->cm_fields['E']);
1963         }
1964         if (strlen(imm.subject) > 0) {
1965                 if (msg->cm_fields['U'] != NULL) {
1966                         free(msg->cm_fields['U']);
1967                 }
1968                 msg->cm_fields['U'] = strdup(imm.subject);
1969         }
1970         if (imm.dtstart > 0) {
1971                 if (msg->cm_fields['T'] != NULL) {
1972                         free(msg->cm_fields['T']);
1973                 }
1974                 msg->cm_fields['T'] = strdup("000000000000000000");
1975                 sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1976         }
1977
1978         return(0);
1979 }
1980
1981
1982 /*
1983  * Things we need to do after saving a calendar event.
1984  */
1985 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1986                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1987                 char *encoding, void *cbuserdata)
1988 {
1989         icalcomponent *cal;
1990
1991         /* We're only interested in calendar items here. */
1992         if (strcasecmp(cbtype, "text/calendar")) {
1993                 return;
1994         }
1995
1996         /* Hunt for the UID and drop it in
1997          * the "user data" pointer for the MIME parser.  When
1998          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1999          * to that string.
2000          */
2001         if (!strcasecmp(cbtype, "text/calendar")) {
2002                 cal = icalcomponent_new_from_string(content);
2003                 if (cal != NULL) {
2004                         ical_saving_vevent(cal);
2005                         icalcomponent_free(cal);
2006                 }
2007         }
2008 }
2009
2010
2011 /*
2012  * Things we need to do after saving a calendar event.
2013  * (This will start back end tasks such as automatic generation of invitations,
2014  * if such actions are appropriate.)
2015  */
2016 int ical_obj_aftersave(struct CtdlMessage *msg)
2017 {
2018         char roomname[ROOMNAMELEN];
2019
2020         /*
2021          * If this isn't the Calendar> room, no further action is necessary.
2022          */
2023
2024         /* First determine if this is our room */
2025         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2026         if (strcasecmp(roomname, CC->room.QRname)) {
2027                 return(0);      /* Not the Calendar room -- don't do anything. */
2028         }
2029
2030         /* It must be an RFC822 message! */
2031         if (msg->cm_format_type != 4) return(1);
2032
2033         /* Reject null messages */
2034         if (msg->cm_fields['M'] == NULL) return(1);
2035
2036         /* Now recurse through it looking for our icalendar data */
2037         mime_parser(msg->cm_fields['M'],
2038                 NULL,
2039                 *ical_obj_aftersave_backend,
2040                 NULL, NULL,
2041                 NULL,
2042                 0
2043         );
2044
2045         return(0);
2046 }
2047
2048
2049 void ical_session_startup(void) {
2050         CIT_ICAL = malloc(sizeof(struct cit_ical));
2051         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2052 }
2053
2054 void ical_session_shutdown(void) {
2055         free(CIT_ICAL);
2056 }
2057
2058
2059 /*
2060  * Back end for ical_fixed_output()
2061  */
2062 void ical_fixed_output_backend(icalcomponent *cal,
2063                         int recursion_level
2064 ) {
2065         icalcomponent *c;
2066         icalproperty *p;
2067         char buf[256];
2068
2069         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2070         if (p != NULL) {
2071                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2072         }
2073
2074         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2075         if (p != NULL) {
2076                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2077         }
2078
2079         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2080         if (p != NULL) {
2081                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2082         }
2083
2084         /* If the component has attendees, iterate through them. */
2085         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2086                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2087                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2088
2089                         /* screen name or email address */
2090                         strcpy(buf, &buf[7]);
2091                         striplt(buf);
2092                         cprintf("%s ", buf);
2093                 }
2094                 cprintf("\n");
2095         }
2096
2097         /* If the component has subcomponents, recurse through them. */
2098         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2099             (c != 0);
2100             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2101                 /* Recursively process subcomponent */
2102                 ical_fixed_output_backend(c, recursion_level+1);
2103         }
2104 }
2105
2106
2107
2108 /*
2109  * Function to output vcalendar data as plain text.  Nobody uses MSG0
2110  * anymore, so really this is just so we expose the vCard data to the full
2111  * text indexer.
2112  */
2113 void ical_fixed_output(char *ptr, int len) {
2114         icalcomponent *cal;
2115         char *stringy_cal;
2116
2117         stringy_cal = malloc(len + 1);
2118         safestrncpy(stringy_cal, ptr, len + 1);
2119         cal = icalcomponent_new_from_string(stringy_cal);
2120         free(stringy_cal);
2121
2122         if (cal == NULL) {
2123                 return;
2124         }
2125
2126         ical_dezonify(cal);
2127         ical_fixed_output_backend(cal, 0);
2128
2129         /* Free the memory we obtained from libical's constructor */
2130         icalcomponent_free(cal);
2131 }
2132
2133
2134 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
2135
2136 /*
2137  * Register this module with the Citadel server.
2138  */
2139 char *serv_calendar_init(void)
2140 {
2141 #ifdef CITADEL_WITH_CALENDAR_SERVICE
2142         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2143         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2144         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2145         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2146         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2147         CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2148         CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2149 #endif
2150         return "$Id$";
2151 }
2152
2153
2154
2155 void serv_calendar_destroy(void)
2156 {
2157 #ifdef CITADEL_WITH_CALENDAR_SERVICE
2158         icaltimezone_free_builtin_timezones();
2159 #endif
2160 }