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
  37 #ifdef CITADEL_WITH_CALENDAR_SERVICE
  38
  39 #include <ical.h>
  40 #include "ical_dezonify.h"
  41
  42 struct ical_respond_data {
  43         char desired_partnum[SIZ];
  44         icalcomponent *cal;
  45 };
  46
  47
  48 /*
  49  * Utility function to create a new VCALENDAR component with some of the
  50  * required fields already set the way we like them.
  51  */
  52 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  53         icalcomponent *encaps;
  54
  55         encaps = icalcomponent_new_vcalendar();
  56         if (encaps == NULL) {
  57                 lprintf(CTDL_CRIT, "Error at %s:%d - could not allocate component!\n",
  58                         __FILE__, __LINE__);
  59                 return NULL;
  60         }
  61
  62         /* Set the Product ID */
  63         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  64
  65         /* Set the Version Number */
  66         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  67
  68         return(encaps);
  69 }
  70
  71
  72 /*
  73  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  74  */
  75 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  76         icalcomponent *encaps;
  77
  78         /* If we're already looking at a full VCALENDAR component,
  79          * don't bother ... just return itself.
  80          */
  81         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  82                 return subcomp;
  83         }
  84
  85         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  86         encaps = icalcomponent_new_citadel_vcalendar();
  87         if (encaps == NULL) return NULL;
  88
  89         /* Encapsulate the subcomponent inside */
  90         icalcomponent_add_component(encaps, subcomp);
  91
  92         /* Convert all timestamps to UTC so we don't have to deal with
  93          * stupid VTIMEZONE crap.
  94          */
  95         ical_dezonify(encaps);
  96
  97         /* Return the object we just created. */
  98         return(encaps);
  99 }
 100
 101
 102
 103
 104 /*
 105  * Write a calendar object into the specified user's calendar room.
 106  *
 107  * ok
 108  */
 109 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 110         char temp[PATH_MAX];
 111         FILE *fp;
 112         char *ser;
 113         icalcomponent *encaps;
 114
 115         if (cal == NULL) return;
 116
 117         /* If the supplied object is a subcomponent, encapsulate it in
 118          * a full VCALENDAR component, and save that instead.
 119          */
 120         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 121                 encaps = ical_encapsulate_subcomponent(
 122                         icalcomponent_new_clone(cal)
 123                 );
 124                 ical_write_to_cal(u, encaps);
 125                 icalcomponent_free(encaps);
 126                 return;
 127         }
 128
 129         CtdlMakeTempFileName(temp, sizeof temp);
 130         ser = icalcomponent_as_ical_string(cal);
 131         if (ser == NULL) return;
 132
 133         /* Make a temp file out of it */
 134         fp = fopen(temp, "w");
 135         if (fp == NULL) return;
 136         fwrite(ser, strlen(ser), 1, fp);
 137         fclose(fp);
 138
 139         /* This handy API function does all the work for us.
 140          */
 141         CtdlWriteObject(USERCALENDARROOM,       /* which room */
 142                         "text/calendar",        /* MIME type */
 143                         temp,                   /* temp file */
 144                         u,                      /* which user */
 145                         0,                      /* not binary */
 146                         0,              /* don't delete others of this type */
 147                         0);                     /* no flags */
 148
 149         unlink(temp);
 150 }
 151
 152
 153 /*
 154  * Add a calendar object to the user's calendar
 155  *
 156  * ok because it uses ical_write_to_cal()
 157  */
 158 void ical_add(icalcomponent *cal, int recursion_level) {
 159         icalcomponent *c;
 160
 161         /*
 162          * The VEVENT subcomponent is the one we're interested in saving.
 163          */
 164         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 165
 166                 ical_write_to_cal(&CC->user, cal);
 167
 168         }
 169
 170         /* If the component has subcomponents, recurse through them. */
 171         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 172             (c != 0);
 173             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 174                 /* Recursively process subcomponent */
 175                 ical_add(c, recursion_level+1);
 176         }
 177
 178 }
 179
 180
 181
 182 /*
 183  * Send a reply to a meeting invitation.
 184  *
 185  * 'request' is the invitation to reply to.
 186  * 'action' is the string "accept" or "decline".
 187  *
 188  * (Sorry about this being more than 80 columns ... there was just
 189  * no easy way to break it down sensibly.)
 190  *
 191  * ok
 192  */
 193 void ical_send_a_reply(icalcomponent *request, char *action) {
 194         icalcomponent *the_reply = NULL;
 195         icalcomponent *vevent = NULL;
 196         icalproperty *attendee = NULL;
 197         char attendee_string[SIZ];
 198         icalproperty *organizer = NULL;
 199         char organizer_string[SIZ];
 200         icalproperty *summary = NULL;
 201         char summary_string[SIZ];
 202         icalproperty *me_attend = NULL;
 203         struct recptypes *recp = NULL;
 204         icalparameter *partstat = NULL;
 205         char *serialized_reply = NULL;
 206         char *reply_message_text = NULL;
 207         struct CtdlMessage *msg = NULL;
 208         struct recptypes *valid = NULL;
 209
 210         strcpy(organizer_string, "");
 211         strcpy(summary_string, "Calendar item");
 212
 213         if (request == NULL) {
 214                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
 215                 return;
 216         }
 217
 218         the_reply = icalcomponent_new_clone(request);
 219         if (the_reply == NULL) {
 220                 lprintf(CTDL_ERR, "ERROR: cannot clone request\n");
 221                 return;
 222         }
 223
 224         /* Change the method from REQUEST to REPLY */
 225         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 226
 227         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 228         if (vevent != NULL) {
 229                 /* Hunt for attendees, removing ones that aren't us.
 230                  * (Actually, remove them all, cloning our own one so we can
 231                  * re-insert it later)
 232                  */
 233                 while (attendee = icalcomponent_get_first_property(vevent,
 234                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 235                 ) {
 236                         if (icalproperty_get_attendee(attendee)) {
 237                                 strcpy(attendee_string,
 238                                         icalproperty_get_attendee(attendee) );
 239                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 240                                         strcpy(attendee_string, &attendee_string[7]);
 241                                         striplt(attendee_string);
 242                                         recp = validate_recipients(attendee_string);
 243                                         if (recp != NULL) {
 244                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 245                                                         if (me_attend) icalproperty_free(me_attend);
 246                                                         me_attend = icalproperty_new_clone(attendee);
 247                                                 }
 248                                                 free(recp);
 249                                         }
 250                                 }
 251                         }
 252                         /* Remove it... */
 253                         icalcomponent_remove_property(vevent, attendee);
 254                         icalproperty_free(attendee);
 255                 }
 256
 257                 /* We found our own address in the attendee list. */
 258                 if (me_attend) {
 259                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 260                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 261
 262                         if (!strcasecmp(action, "accept")) {
 263                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 264                         }
 265                         else if (!strcasecmp(action, "decline")) {
 266                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 267                         }
 268                         else if (!strcasecmp(action, "tentative")) {
 269                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 270                         }
 271
 272                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 273
 274                         /* Now insert it back into the vevent. */
 275                         icalcomponent_add_property(vevent, me_attend);
 276                 }
 277
 278                 /* Figure out who to send this thing to */
 279                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 280                 if (organizer != NULL) {
 281                         if (icalproperty_get_organizer(organizer)) {
 282                                 strcpy(organizer_string,
 283                                         icalproperty_get_organizer(organizer) );
 284                         }
 285                 }
 286                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 287                         strcpy(organizer_string, &organizer_string[7]);
 288                         striplt(organizer_string);
 289                 } else {
 290                         strcpy(organizer_string, "");
 291                 }
 292
 293                 /* Extract the summary string -- we'll use it as the
 294                  * message subject for the reply
 295                  */
 296                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 297                 if (summary != NULL) {
 298                         if (icalproperty_get_summary(summary)) {
 299                                 strcpy(summary_string,
 300                                         icalproperty_get_summary(summary) );
 301                         }
 302                 }
 303
 304         }
 305
 306         /* Now generate the reply message and send it out. */
 307         serialized_reply = strdup(icalcomponent_as_ical_string(the_reply));
 308         icalcomponent_free(the_reply);  /* don't need this anymore */
 309         if (serialized_reply == NULL) return;
 310
 311         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 312         if (reply_message_text != NULL) {
 313                 sprintf(reply_message_text,
 314                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 315                         serialized_reply
 316                 );
 317
 318                 msg = CtdlMakeMessage(&CC->user,
 319                         organizer_string,       /* to */
 320                         "",                     /* cc */
 321                         CC->room.QRname, 0, FMT_RFC822,
 322                         "",
 323                         summary_string,         /* Use summary for subject */
 324                         NULL,
 325                         reply_message_text);
 326
 327                 if (msg != NULL) {
 328                         valid = validate_recipients(organizer_string);
 329                         CtdlSubmitMsg(msg, valid, "");
 330                         CtdlFreeMessage(msg);
 331                 }
 332         }
 333         free(serialized_reply);
 334 }
 335
 336
 337
 338 /*
 339  * Callback function for mime parser that hunts for calendar content types
 340  * and turns them into calendar objects
 341  */
 342 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 343                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 344                 void *cbuserdata) {
 345
 346         struct ical_respond_data *ird = NULL;
 347
 348         ird = (struct ical_respond_data *) cbuserdata;
 349
 350         /* desired_partnum can be set to "_HUNT_" to have it just look for
 351          * the first part with a content type of text/calendar.  Otherwise
 352          * we have to only process the right one.
 353          */
 354         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 355                 if (strcasecmp(partnum, ird->desired_partnum)) {
 356                         return;
 357                 }
 358         }
 359
 360         if (strcasecmp(cbtype, "text/calendar")) {
 361                 return;
 362         }
 363
 364         if (ird->cal != NULL) {
 365                 icalcomponent_free(ird->cal);
 366                 ird->cal = NULL;
 367         }
 368
 369         ird->cal = icalcomponent_new_from_string(content);
 370         if (ird->cal != NULL) {
 371                 ical_dezonify(ird->cal);
 372         }
 373 }
 374
 375
 376 /*
 377  * Respond to a meeting request.
 378  */
 379 void ical_respond(long msgnum, char *partnum, char *action) {
 380         struct CtdlMessage *msg;
 381         struct ical_respond_data ird;
 382
 383         if (
 384            (strcasecmp(action, "accept"))
 385            && (strcasecmp(action, "decline"))
 386         ) {
 387                 cprintf("%d Action must be 'accept' or 'decline'\n",
 388                         ERROR + ILLEGAL_VALUE
 389                 );
 390                 return;
 391         }
 392
 393         msg = CtdlFetchMessage(msgnum, 1);
 394         if (msg == NULL) {
 395                 cprintf("%d Message %ld not found.\n",
 396                         ERROR + ILLEGAL_VALUE,
 397                         (long)msgnum
 398                 );
 399                 return;
 400         }
 401
 402         memset(&ird, 0, sizeof ird);
 403         strcpy(ird.desired_partnum, partnum);
 404         mime_parser(msg->cm_fields['M'],
 405                 NULL,
 406                 *ical_locate_part,              /* callback function */
 407                 NULL, NULL,
 408                 (void *) &ird,                  /* user data */
 409                 0
 410         );
 411
 412         /* We're done with the incoming message, because we now have a
 413          * calendar object in memory.
 414          */
 415         CtdlFreeMessage(msg);
 416
 417         /*
 418          * Here is the real meat of this function.  Handle the event.
 419          */
 420         if (ird.cal != NULL) {
 421                 /* Save this in the user's calendar if necessary */
 422                 if (!strcasecmp(action, "accept")) {
 423                         ical_add(ird.cal, 0);
 424                 }
 425
 426                 /* Send a reply if necessary */
 427                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 428                         ical_send_a_reply(ird.cal, action);
 429                 }
 430
 431                 /* Now that we've processed this message, we don't need it
 432                  * anymore.  So delete it.
 433                  */
 434                 CtdlDeleteMessages(CC->room.QRname, msgnum, "", 1);
 435
 436                 /* Free the memory we allocated and return a response. */
 437                 icalcomponent_free(ird.cal);
 438                 ird.cal = NULL;
 439                 cprintf("%d ok\n", CIT_OK);
 440                 return;
 441         }
 442         else {
 443                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 444                 return;
 445         }
 446
 447         /* should never get here */
 448 }
 449
 450
 451 /*
 452  * Figure out the UID of the calendar event being referred to in a
 453  * REPLY object.  This function is recursive.
 454  */
 455 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 456         icalcomponent *subcomponent;
 457         icalproperty *p;
 458
 459         /* If this object is a REPLY, then extract the UID. */
 460         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 461                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 462                 if (p != NULL) {
 463                         strcpy(uidbuf, icalproperty_get_comment(p));
 464                 }
 465         }
 466
 467         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 468          * UID of the reply; we want the UID of the invitation being replied to.
 469          */
 470         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 471             subcomponent != NULL;
 472             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 473                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 474         }
 475 }
 476
 477
 478 /*
 479  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 480  * locate the message containing the calendar event we're replying to, this function
 481  * gets called.  It basically just sticks the message number in a supplied buffer.
 482  */
 483 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 484         long *msgnumptr;
 485
 486         msgnumptr = (long *) data;
 487         *msgnumptr = msgnum;
 488 }
 489
 490
 491 struct original_event_container {
 492         icalcomponent *c;
 493 };
 494
 495 /*
 496  * Callback function for mime parser that hunts for calendar content types
 497  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 498  * to fetch the object being updated)
 499  */
 500 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 501                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 502                 void *cbuserdata) {
 503
 504         struct original_event_container *oec = NULL;
 505
 506         if (strcasecmp(cbtype, "text/calendar")) {
 507                 return;
 508         }
 509         oec = (struct original_event_container *) cbuserdata;
 510         if (oec->c != NULL) {
 511                 icalcomponent_free(oec->c);
 512         }
 513         oec->c = icalcomponent_new_from_string(content);
 514 }
 515
 516
 517 /*
 518  * Merge updated attendee information from a REPLY into an existing event.
 519  */
 520 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 521         icalcomponent *c;
 522         icalproperty *e_attendee, *r_attendee;
 523
 524         /* First things first.  If we're not looking at a VEVENT component,
 525          * recurse through subcomponents until we find one.
 526          */
 527         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 528                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 529                     c != NULL;
 530                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 531                         ical_merge_attendee_reply(c, reply);
 532                 }
 533                 return;
 534         }
 535
 536         /* Now do the same thing with the reply.
 537          */
 538         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 539                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 540                     c != NULL;
 541                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 542                         ical_merge_attendee_reply(event, c);
 543                 }
 544                 return;
 545         }
 546
 547         /* Clone the reply, because we're going to rip its guts out. */
 548         reply = icalcomponent_new_clone(reply);
 549
 550         /* At this point we're looking at the correct subcomponents.
 551          * Iterate through the attendees looking for a match.
 552          */
 553 STARTOVER:
 554         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 555             e_attendee != NULL;
 556             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 557
 558                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 559                     r_attendee != NULL;
 560                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 561
 562                         /* Check to see if these two attendees match...
 563                          */
 564                         if (!strcasecmp(
 565                            icalproperty_get_attendee(e_attendee),
 566                            icalproperty_get_attendee(r_attendee)
 567                         )) {
 568                                 /* ...and if they do, remove the attendee from the event
 569                                  * and replace it with the attendee from the reply.  (The
 570                                  * reply's copy will have the same address, but an updated
 571                                  * status.)
 572                                  */
 573                                 icalcomponent_remove_property(event, e_attendee);
 574                                 icalproperty_free(e_attendee);
 575                                 icalcomponent_remove_property(reply, r_attendee);
 576                                 icalcomponent_add_property(event, r_attendee);
 577
 578                                 /* Since we diddled both sets of attendees, we have to start
 579                                  * the iteration over again.  This will not create an infinite
 580                                  * loop because we removed the attendee from the reply.  (That's
 581                                  * why we cloned the reply, and that's what we mean by "ripping
 582                                  * its guts out.")
 583                                  */
 584                                 goto STARTOVER;
 585                         }
 586
 587                 }
 588         }
 589
 590         /* Free the *clone* of the reply. */
 591         icalcomponent_free(reply);
 592 }
 593
 594
 595
 596
 597 /*
 598  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 599  * calendar event.  The object has already been deserialized for us; all
 600  * we have to do here is hunt for the event in our calendar, merge in the
 601  * updated attendee status, and save it again.
 602  *
 603  * This function returns 0 on success, 1 if the event was not found in the
 604  * user's calendar, or 2 if an internal error occurred.
 605  */
 606 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 607         char uid[SIZ];
 608         char hold_rm[ROOMNAMELEN];
 609         long msgnum_being_replaced = 0;
 610         struct CtdlMessage *template = NULL;
 611         struct CtdlMessage *msg;
 612         struct original_event_container oec;
 613         icalcomponent *original_event;
 614         char *serialized_event = NULL;
 615         char roomname[ROOMNAMELEN];
 616         char *message_text = NULL;
 617
 618         /* Figure out just what event it is we're dealing with */
 619         strcpy(uid, "--==<< InVaLiD uId >>==--");
 620         ical_learn_uid_of_reply(uid, cal);
 621         lprintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 622
 623         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 624
 625         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 626                 getroom(&CC->room, hold_rm);
 627                 lprintf(CTDL_CRIT, "cannot get user calendar room\n");
 628                 return(2);
 629         }
 630
 631         /*
 632          * Pound through the user's calendar looking for a message with
 633          * the Citadel EUID set to the value we're looking for.  Since
 634          * Citadel always sets the message EUID to the vCalendar UID of
 635          * the event, this will work.
 636          */
 637         template = (struct CtdlMessage *)
 638                 malloc(sizeof(struct CtdlMessage));
 639         memset(template, 0, sizeof(struct CtdlMessage));
 640         template->cm_fields['E'] = strdup(uid);
 641         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 642                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 643         CtdlFreeMessage(template);
 644         getroom(&CC->room, hold_rm);    /* return to saved room */
 645
 646         lprintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 647         if (msgnum_being_replaced == 0) {
 648                 return(1);                      /* no calendar event found */
 649         }
 650
 651         /* Now we know the ID of the message containing the event being updated.
 652          * We don't actually have to delete it; that'll get taken care of by the
 653          * server when we save another event with the same UID.  This just gives
 654          * us the ability to load the event into memory so we can diddle the
 655          * attendees.
 656          */
 657         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 658         if (msg == NULL) {
 659                 return(2);                      /* internal error */
 660         }
 661         oec.c = NULL;
 662         mime_parser(msg->cm_fields['M'],
 663                 NULL,
 664                 *ical_locate_original_event,    /* callback function */
 665                 NULL, NULL,
 666                 &oec,                           /* user data */
 667                 0
 668         );
 669         CtdlFreeMessage(msg);
 670
 671         original_event = oec.c;
 672         if (original_event == NULL) {
 673                 lprintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 674                 return(2);
 675         }
 676
 677         /* Merge the attendee's updated status into the event */
 678         ical_merge_attendee_reply(original_event, cal);
 679
 680         /* Serialize it */
 681         serialized_event = strdup(icalcomponent_as_ical_string(original_event));
 682         icalcomponent_free(original_event);     /* Don't need this anymore. */
 683         if (serialized_event == NULL) return(2);
 684
 685         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 686
 687         message_text = malloc(strlen(serialized_event) + SIZ);
 688         if (message_text != NULL) {
 689                 sprintf(message_text,
 690                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 691                         serialized_event
 692                 );
 693
 694                 msg = CtdlMakeMessage(&CC->user,
 695                         "",                     /* No recipient */
 696                         "",                     /* No recipient */
 697                         roomname,
 698                         0, FMT_RFC822,
 699                         "",
 700                         "",             /* no subject */
 701                         NULL,
 702                         message_text);
 703
 704                 if (msg != NULL) {
 705                         CIT_ICAL->avoid_sending_invitations = 1;
 706                         CtdlSubmitMsg(msg, NULL, roomname);
 707                         CtdlFreeMessage(msg);
 708                         CIT_ICAL->avoid_sending_invitations = 0;
 709                 }
 710         }
 711         free(serialized_event);
 712         return(0);
 713 }
 714
 715
 716 /*
 717  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 718  * simply extracts the calendar object from the message, deserializes it, and
 719  * passes it up to ical_update_my_calendar_with_reply() for processing.
 720  */
 721 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 722         struct CtdlMessage *msg;
 723         struct ical_respond_data ird;
 724         int ret;
 725
 726         if (
 727            (strcasecmp(action, "update"))
 728            && (strcasecmp(action, "ignore"))
 729         ) {
 730                 cprintf("%d Action must be 'update' or 'ignore'\n",
 731                         ERROR + ILLEGAL_VALUE
 732                 );
 733                 return;
 734         }
 735
 736         msg = CtdlFetchMessage(msgnum, 1);
 737         if (msg == NULL) {
 738                 cprintf("%d Message %ld not found.\n",
 739                         ERROR + ILLEGAL_VALUE,
 740                         (long)msgnum
 741                 );
 742                 return;
 743         }
 744
 745         memset(&ird, 0, sizeof ird);
 746         strcpy(ird.desired_partnum, partnum);
 747         mime_parser(msg->cm_fields['M'],
 748                 NULL,
 749                 *ical_locate_part,              /* callback function */
 750                 NULL, NULL,
 751                 (void *) &ird,                  /* user data */
 752                 0
 753         );
 754
 755         /* We're done with the incoming message, because we now have a
 756          * calendar object in memory.
 757          */
 758         CtdlFreeMessage(msg);
 759
 760         /*
 761          * Here is the real meat of this function.  Handle the event.
 762          */
 763         if (ird.cal != NULL) {
 764                 /* Update the user's calendar if necessary */
 765                 if (!strcasecmp(action, "update")) {
 766                         ret = ical_update_my_calendar_with_reply(ird.cal);
 767                         if (ret == 0) {
 768                                 cprintf("%d Your calendar has been updated with this reply.\n",
 769                                         CIT_OK);
 770                         }
 771                         else if (ret == 1) {
 772                                 cprintf("%d This event does not exist in your calendar.\n",
 773                                         ERROR + FILE_NOT_FOUND);
 774                         }
 775                         else {
 776                                 cprintf("%d An internal error occurred.\n",
 777                                         ERROR + INTERNAL_ERROR);
 778                         }
 779                 }
 780                 else {
 781                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 782                 }
 783
 784                 /* Now that we've processed this message, we don't need it
 785                  * anymore.  So delete it.  (Maybe make this optional?)
 786                  */
 787                 CtdlDeleteMessages(CC->room.QRname, msgnum, "", 1);
 788
 789                 /* Free the memory we allocated and return a response. */
 790                 icalcomponent_free(ird.cal);
 791                 ird.cal = NULL;
 792                 return;
 793         }
 794         else {
 795                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 796                 return;
 797         }
 798
 799         /* should never get here */
 800 }
 801
 802
 803 /*
 804  * Search for a property in both the top level and in a VEVENT subcomponent
 805  */
 806 icalproperty *ical_ctdl_get_subprop(
 807                 icalcomponent *cal,
 808                 icalproperty_kind which_prop
 809 ) {
 810         icalproperty *p;
 811         icalcomponent *c;
 812
 813         p = icalcomponent_get_first_property(cal, which_prop);
 814         if (p == NULL) {
 815                 c = icalcomponent_get_first_component(cal,
 816                                                         ICAL_VEVENT_COMPONENT);
 817                 if (c != NULL) {
 818                         p = icalcomponent_get_first_property(c, which_prop);
 819                 }
 820         }
 821         return p;
 822 }
 823
 824
 825 /*
 826  * Check to see if two events overlap.  Returns nonzero if they do.
 827  * (This function is used in both Citadel and WebCit.  If you change it in
 828  * one place, change it in the other.  Better yet, put it in a library.)
 829  */
 830 int ical_ctdl_is_overlap(
 831                         struct icaltimetype t1start,
 832                         struct icaltimetype t1end,
 833                         struct icaltimetype t2start,
 834                         struct icaltimetype t2end
 835 ) {
 836
 837         if (icaltime_is_null_time(t1start)) return(0);
 838         if (icaltime_is_null_time(t2start)) return(0);
 839
 840         /* First, check for all-day events */
 841         if (t1start.is_date) {
 842                 if (!icaltime_compare_date_only(t1start, t2start)) {
 843                         return(1);
 844                 }
 845                 if (!icaltime_is_null_time(t2end)) {
 846                         if (!icaltime_compare_date_only(t1start, t2end)) {
 847                                 return(1);
 848                         }
 849                 }
 850         }
 851
 852         if (t2start.is_date) {
 853                 if (!icaltime_compare_date_only(t2start, t1start)) {
 854                         return(1);
 855                 }
 856                 if (!icaltime_is_null_time(t1end)) {
 857                         if (!icaltime_compare_date_only(t2start, t1end)) {
 858                                 return(1);
 859                         }
 860                 }
 861         }
 862
 863         /* Now check for overlaps using date *and* time. */
 864
 865         /* First, bail out if either event 1 or event 2 is missing end time. */
 866         if (icaltime_is_null_time(t1end)) return(0);
 867         if (icaltime_is_null_time(t2end)) return(0);
 868
 869         /* If event 1 ends before event 2 starts, we're in the clear. */
 870         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 871
 872         /* If event 2 ends before event 1 starts, we're also ok. */
 873         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 874
 875         /* Otherwise, they overlap. */
 876         return(1);
 877 }
 878
 879
 880
 881 /*
 882  * Backend for ical_hunt_for_conflicts()
 883  */
 884 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 885         icalcomponent *cal;
 886         struct CtdlMessage *msg;
 887         struct ical_respond_data ird;
 888         struct icaltimetype t1start, t1end, t2start, t2end;
 889         icalproperty *p;
 890         char conflict_event_uid[SIZ];
 891         char conflict_event_summary[SIZ];
 892         char compare_uid[SIZ];
 893
 894         cal = (icalcomponent *)data;
 895         strcpy(compare_uid, "");
 896         strcpy(conflict_event_uid, "");
 897         strcpy(conflict_event_summary, "");
 898
 899         msg = CtdlFetchMessage(msgnum, 1);
 900         if (msg == NULL) return;
 901         memset(&ird, 0, sizeof ird);
 902         strcpy(ird.desired_partnum, "_HUNT_");
 903         mime_parser(msg->cm_fields['M'],
 904                 NULL,
 905                 *ical_locate_part,              /* callback function */
 906                 NULL, NULL,
 907                 (void *) &ird,                  /* user data */
 908                 0
 909         );
 910         CtdlFreeMessage(msg);
 911
 912         if (ird.cal == NULL) return;
 913
 914         t1start = icaltime_null_time();
 915         t1end = icaltime_null_time();
 916         t2start = icaltime_null_time();
 917         t1end = icaltime_null_time();
 918
 919         /* Now compare cal to ird.cal */
 920         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 921         if (p == NULL) return;
 922         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 923
 924         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 925         if (p != NULL) t2end = icalproperty_get_dtend(p);
 926
 927         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 928         if (p == NULL) return;
 929         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 930
 931         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 932         if (p != NULL) t1end = icalproperty_get_dtend(p);
 933
 934         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 935         if (p != NULL) {
 936                 strcpy(compare_uid, icalproperty_get_comment(p));
 937         }
 938
 939         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 940         if (p != NULL) {
 941                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 942         }
 943
 944         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 945         if (p != NULL) {
 946                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 947         }
 948
 949         icalcomponent_free(ird.cal);
 950
 951         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 952                 cprintf("%ld||%s|%s|%d|\n",
 953                         msgnum,
 954                         conflict_event_uid,
 955                         conflict_event_summary,
 956                         (       ((strlen(compare_uid)>0)
 957                                 &&(!strcasecmp(compare_uid,
 958                                 conflict_event_uid))) ? 1 : 0
 959                         )
 960                 );
 961         }
 962 }
 963
 964
 965
 966 /*
 967  * Phase 2 of "hunt for conflicts" operation.
 968  * At this point we have a calendar object which represents the VEVENT that
 969  * we're considering adding to the calendar.  Now hunt through the user's
 970  * calendar room, and output zero or more existing VEVENTs which conflict
 971  * with this one.
 972  */
 973 void ical_hunt_for_conflicts(icalcomponent *cal) {
 974         char hold_rm[ROOMNAMELEN];
 975
 976         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 977
 978         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 979                 getroom(&CC->room, hold_rm);
 980                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
 981                 return;
 982         }
 983
 984         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 985
 986         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 987                 NULL,
 988                 ical_hunt_for_conflicts_backend,
 989                 (void *) cal
 990         );
 991
 992         cprintf("000\n");
 993         getroom(&CC->room, hold_rm);    /* return to saved room */
 994
 995 }
 996
 997
 998
 999 /*
1000  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1001  */
1002 void ical_conflicts(long msgnum, char *partnum) {
1003         struct CtdlMessage *msg;
1004         struct ical_respond_data ird;
1005
1006         msg = CtdlFetchMessage(msgnum, 1);
1007         if (msg == NULL) {
1008                 cprintf("%d Message %ld not found.\n",
1009                         ERROR + ILLEGAL_VALUE,
1010                         (long)msgnum
1011                 );
1012                 return;
1013         }
1014
1015         memset(&ird, 0, sizeof ird);
1016         strcpy(ird.desired_partnum, partnum);
1017         mime_parser(msg->cm_fields['M'],
1018                 NULL,
1019                 *ical_locate_part,              /* callback function */
1020                 NULL, NULL,
1021                 (void *) &ird,                  /* user data */
1022                 0
1023         );
1024
1025         CtdlFreeMessage(msg);
1026
1027         if (ird.cal != NULL) {
1028                 ical_hunt_for_conflicts(ird.cal);
1029                 icalcomponent_free(ird.cal);
1030                 return;
1031         }
1032         else {
1033                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1034                 return;
1035         }
1036
1037         /* should never get here */
1038 }
1039
1040
1041
1042 /*
1043  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1044  */
1045 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1046         icalproperty *p;
1047         icalvalue *v;
1048         struct icalperiodtype my_period;
1049
1050         if (cal == NULL) return;
1051         my_period = icalperiodtype_null_period();
1052
1053         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1054                 ical_add_to_freebusy(fb,
1055                         icalcomponent_get_first_component(
1056                                 cal, ICAL_VEVENT_COMPONENT
1057                         )
1058                 );
1059                 return;
1060         }
1061
1062         ical_dezonify(cal);
1063
1064         /* If this event is not opaque, the user isn't publishing it as
1065          * busy time, so don't bother doing anything else.
1066          */
1067         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1068         if (p != NULL) {
1069                 v = icalproperty_get_value(p);
1070                 if (v != NULL) {
1071                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1072                                 return;
1073                         }
1074                 }
1075         }
1076
1077         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1078         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1079         if (p != NULL) {
1080                 my_period.start = icalproperty_get_dtstart(p);
1081         }
1082
1083         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1084         if (p != NULL) {
1085                 my_period.end = icalproperty_get_dtstart(p);
1086         }
1087
1088         /* Now add it. */
1089         icalcomponent_add_property(fb,
1090                 icalproperty_new_freebusy(my_period)
1091         );
1092
1093         /* Make sure the DTSTART property of the freebusy *list* is set to
1094          * the DTSTART property of the *earliest event*.
1095          */
1096         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1097         if (p == NULL) {
1098                 icalcomponent_set_dtstart(fb,
1099                         icalcomponent_get_dtstart(cal) );
1100         }
1101         else {
1102                 if (icaltime_compare(
1103                         icalcomponent_get_dtstart(cal),
1104                         icalcomponent_get_dtstart(fb)
1105                    ) < 0) {
1106                         icalcomponent_set_dtstart(fb,
1107                                 icalcomponent_get_dtstart(cal) );
1108                 }
1109         }
1110
1111         /* Make sure the DTEND property of the freebusy *list* is set to
1112          * the DTEND property of the *latest event*.
1113          */
1114         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1115         if (p == NULL) {
1116                 icalcomponent_set_dtend(fb,
1117                         icalcomponent_get_dtend(cal) );
1118         }
1119         else {
1120                 if (icaltime_compare(
1121                         icalcomponent_get_dtend(cal),
1122                         icalcomponent_get_dtend(fb)
1123                    ) > 0) {
1124                         icalcomponent_set_dtend(fb,
1125                                 icalcomponent_get_dtend(cal) );
1126                 }
1127         }
1128
1129 }
1130
1131
1132
1133 /*
1134  * Backend for ical_freebusy()
1135  *
1136  * This function simply loads the messages in the user's calendar room,
1137  * which contain VEVENTs, then strips them of all non-freebusy data, and
1138  * adds them to the supplied VCALENDAR.
1139  *
1140  */
1141 void ical_freebusy_backend(long msgnum, void *data) {
1142         icalcomponent *cal;
1143         struct CtdlMessage *msg;
1144         struct ical_respond_data ird;
1145
1146         cal = (icalcomponent *)data;
1147
1148         msg = CtdlFetchMessage(msgnum, 1);
1149         if (msg == NULL) return;
1150         memset(&ird, 0, sizeof ird);
1151         strcpy(ird.desired_partnum, "_HUNT_");
1152         mime_parser(msg->cm_fields['M'],
1153                 NULL,
1154                 *ical_locate_part,              /* callback function */
1155                 NULL, NULL,
1156                 (void *) &ird,                  /* user data */
1157                 0
1158         );
1159         CtdlFreeMessage(msg);
1160
1161         if (ird.cal == NULL) return;
1162
1163         ical_add_to_freebusy(cal, ird.cal);
1164
1165         /* Now free the memory. */
1166         icalcomponent_free(ird.cal);
1167 }
1168
1169
1170
1171 /*
1172  * Grab another user's free/busy times
1173  */
1174 void ical_freebusy(char *who) {
1175         struct ctdluser usbuf;
1176         char calendar_room_name[ROOMNAMELEN];
1177         char hold_rm[ROOMNAMELEN];
1178         char *serialized_request = NULL;
1179         icalcomponent *encaps = NULL;
1180         icalcomponent *fb = NULL;
1181         int found_user = (-1);
1182         struct recptypes *recp = NULL;
1183         char buf[256];
1184         char host[256];
1185         char type[256];
1186         int i = 0;
1187         int config_lines = 0;
1188
1189         /* First try an exact match. */
1190         found_user = getuser(&usbuf, who);
1191
1192         /* If not found, try it as an unqualified email address. */
1193         if (found_user != 0) {
1194                 strcpy(buf, who);
1195                 recp = validate_recipients(buf);
1196                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1197                 if (recp != NULL) {
1198                         if (recp->num_local == 1) {
1199                                 found_user = getuser(&usbuf, recp->recp_local);
1200                         }
1201                         free(recp);
1202                 }
1203         }
1204
1205         /* If still not found, try it as an address qualified with the
1206          * primary FQDN of this Citadel node.
1207          */
1208         if (found_user != 0) {
1209                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1210                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1211                 recp = validate_recipients(buf);
1212                 if (recp != NULL) {
1213                         if (recp->num_local == 1) {
1214                                 found_user = getuser(&usbuf, recp->recp_local);
1215                         }
1216                         free(recp);
1217                 }
1218         }
1219
1220         /* Still not found?  Try qualifying it with every domain we
1221          * might have addresses in.
1222          */
1223         if (found_user != 0) {
1224                 config_lines = num_tokens(inetcfg, '\n');
1225                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1226                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1227                         extract_token(host, buf, 0, '|', sizeof host);
1228                         extract_token(type, buf, 1, '|', sizeof type);
1229
1230                         if ( (!strcasecmp(type, "localhost"))
1231                            || (!strcasecmp(type, "directory")) ) {
1232                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1233                                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1234                                 recp = validate_recipients(buf);
1235                                 if (recp != NULL) {
1236                                         if (recp->num_local == 1) {
1237                                                 found_user = getuser(&usbuf, recp->recp_local);
1238                                         }
1239                                         free(recp);
1240                                 }
1241                         }
1242                 }
1243         }
1244
1245         if (found_user != 0) {
1246                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1247                 return;
1248         }
1249
1250         MailboxName(calendar_room_name, sizeof calendar_room_name,
1251                 &usbuf, USERCALENDARROOM);
1252
1253         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1254
1255         if (getroom(&CC->room, calendar_room_name) != 0) {
1256                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1257                 getroom(&CC->room, hold_rm);
1258                 return;
1259         }
1260
1261         /* Create a VFREEBUSY subcomponent */
1262         lprintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1263         fb = icalcomponent_new_vfreebusy();
1264         if (fb == NULL) {
1265                 cprintf("%d Internal error: cannot allocate memory.\n",
1266                         ERROR + INTERNAL_ERROR);
1267                 icalcomponent_free(encaps);
1268                 getroom(&CC->room, hold_rm);
1269                 return;
1270         }
1271
1272         /* Set the method to PUBLISH */
1273         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1274
1275         /* Set the DTSTAMP to right now. */
1276         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1277
1278         /* Add the user's email address as ORGANIZER */
1279         sprintf(buf, "MAILTO:%s", who);
1280         if (strchr(buf, '@') == NULL) {
1281                 strcat(buf, "@");
1282                 strcat(buf, config.c_fqdn);
1283         }
1284         for (i=0; i<strlen(buf); ++i) {
1285                 if (buf[i]==' ') buf[i] = '_';
1286         }
1287         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1288
1289         /* Add busy time from events */
1290         lprintf(CTDL_DEBUG, "Adding busy time from events\n");
1291         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
1292                 NULL, ical_freebusy_backend, (void *)fb
1293         );
1294
1295         /* If values for DTSTART and DTEND are still not present, set them
1296          * to yesterday and tomorrow as default values.
1297          */
1298         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1299                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1300         }
1301         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1302                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1303         }
1304
1305         /* Put the freebusy component into the calendar component */
1306         lprintf(CTDL_DEBUG, "Encapsulating\n");
1307         encaps = ical_encapsulate_subcomponent(fb);
1308         if (encaps == NULL) {
1309                 icalcomponent_free(fb);
1310                 cprintf("%d Internal error: cannot allocate memory.\n",
1311                         ERROR + INTERNAL_ERROR);
1312                 getroom(&CC->room, hold_rm);
1313                 return;
1314         }
1315
1316         /* Set the method to PUBLISH */
1317         lprintf(CTDL_DEBUG, "Setting method\n");
1318         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1319
1320         /* Serialize it */
1321         lprintf(CTDL_DEBUG, "Serializing\n");
1322         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1323         icalcomponent_free(encaps);     /* Don't need this anymore. */
1324
1325         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1326         if (serialized_request != NULL) {
1327                 client_write(serialized_request, strlen(serialized_request));
1328                 free(serialized_request);
1329         }
1330         cprintf("\n000\n");
1331
1332         /* Go back to the room from which we came... */
1333         getroom(&CC->room, hold_rm);
1334 }
1335
1336
1337
1338
1339 /*
1340  * All Citadel calendar commands from the client come through here.
1341  */
1342 void cmd_ical(char *argbuf)
1343 {
1344         char subcmd[64];
1345         long msgnum;
1346         char partnum[256];
1347         char action[256];
1348         char who[256];
1349
1350         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1351
1352         /* Allow "test" and "freebusy" subcommands without logging in. */
1353
1354         if (!strcasecmp(subcmd, "test")) {
1355                 cprintf("%d This server supports calendaring\n", CIT_OK);
1356                 return;
1357         }
1358
1359         if (!strcasecmp(subcmd, "freebusy")) {
1360                 extract_token(who, argbuf, 1, '|', sizeof who);
1361                 ical_freebusy(who);
1362                 return;
1363         }
1364
1365         if (!strcasecmp(subcmd, "sgi")) {
1366                 CIT_ICAL->server_generated_invitations =
1367                         (extract_int(argbuf, 1) ? 1 : 0) ;
1368                 cprintf("%d %d\n",
1369                         CIT_OK, CIT_ICAL->server_generated_invitations);
1370                 return;
1371         }
1372
1373         if (CtdlAccessCheck(ac_logged_in)) return;
1374
1375         if (!strcasecmp(subcmd, "respond")) {
1376                 msgnum = extract_long(argbuf, 1);
1377                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1378                 extract_token(action, argbuf, 3, '|', sizeof action);
1379                 ical_respond(msgnum, partnum, action);
1380                 return;
1381         }
1382
1383         if (!strcasecmp(subcmd, "handle_rsvp")) {
1384                 msgnum = extract_long(argbuf, 1);
1385                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1386                 extract_token(action, argbuf, 3, '|', sizeof action);
1387                 ical_handle_rsvp(msgnum, partnum, action);
1388                 return;
1389         }
1390
1391         if (!strcasecmp(subcmd, "conflicts")) {
1392                 msgnum = extract_long(argbuf, 1);
1393                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1394                 ical_conflicts(msgnum, partnum);
1395                 return;
1396         }
1397
1398         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1399 }
1400
1401
1402
1403 /*
1404  * We don't know if the calendar room exists so we just create it at login
1405  */
1406 void ical_create_room(void)
1407 {
1408         struct ctdlroom qr;
1409         struct visit vbuf;
1410
1411         /* Create the calendar room if it doesn't already exist */
1412         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1413
1414         /* Set expiration policy to manual; otherwise objects will be lost! */
1415         if (lgetroom(&qr, USERCALENDARROOM)) {
1416                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1417                 return;
1418         }
1419         qr.QRep.expire_mode = EXPIRE_MANUAL;
1420         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1421         lputroom(&qr);
1422
1423         /* Set the view to a calendar view */
1424         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1425         vbuf.v_view = VIEW_CALENDAR;
1426         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1427
1428         /* Create the tasks list room if it doesn't already exist */
1429         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1430
1431         /* Set expiration policy to manual; otherwise objects will be lost! */
1432         if (lgetroom(&qr, USERTASKSROOM)) {
1433                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1434                 return;
1435         }
1436         qr.QRep.expire_mode = EXPIRE_MANUAL;
1437         qr.QRdefaultview = VIEW_TASKS;
1438         lputroom(&qr);
1439
1440         /* Set the view to a task list view */
1441         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1442         vbuf.v_view = VIEW_TASKS;
1443         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1444
1445         /* Create the notes room if it doesn't already exist */
1446         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1447
1448         /* Set expiration policy to manual; otherwise objects will be lost! */
1449         if (lgetroom(&qr, USERNOTESROOM)) {
1450                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1451                 return;
1452         }
1453         qr.QRep.expire_mode = EXPIRE_MANUAL;
1454         qr.QRdefaultview = VIEW_NOTES;
1455         lputroom(&qr);
1456
1457         /* Set the view to a notes view */
1458         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1459         vbuf.v_view = VIEW_NOTES;
1460         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1461
1462         return;
1463 }
1464
1465
1466 /*
1467  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1468  * finds a VEVENT.
1469  */
1470 void ical_send_out_invitations(icalcomponent *cal) {
1471         icalcomponent *the_request = NULL;
1472         char *serialized_request = NULL;
1473         icalcomponent *encaps = NULL;
1474         char *request_message_text = NULL;
1475         struct CtdlMessage *msg = NULL;
1476         struct recptypes *valid = NULL;
1477         char attendees_string[SIZ];
1478         int num_attendees = 0;
1479         char this_attendee[256];
1480         icalproperty *attendee = NULL;
1481         char summary_string[SIZ];
1482         icalproperty *summary = NULL;
1483
1484         if (cal == NULL) {
1485                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1486                 return;
1487         }
1488
1489
1490         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1491         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1492                 ical_send_out_invitations(
1493                         icalcomponent_get_first_component(
1494                                 cal, ICAL_VEVENT_COMPONENT
1495                         )
1496                 );
1497                 return;
1498         }
1499
1500         /* Clone the event */
1501         the_request = icalcomponent_new_clone(cal);
1502         if (the_request == NULL) {
1503                 lprintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1504                 return;
1505         }
1506
1507         /* Extract the summary string -- we'll use it as the
1508          * message subject for the request
1509          */
1510         strcpy(summary_string, "Meeting request");
1511         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1512         if (summary != NULL) {
1513                 if (icalproperty_get_summary(summary)) {
1514                         strcpy(summary_string,
1515                                 icalproperty_get_summary(summary) );
1516                 }
1517         }
1518
1519         /* Determine who the recipients of this message are (the attendees) */
1520         strcpy(attendees_string, "");
1521         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1522                 if (icalproperty_get_attendee(attendee)) {
1523                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1524                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1525                                 strcpy(this_attendee, &this_attendee[7]);
1526
1527                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1528                                         snprintf(&attendees_string[strlen(attendees_string)],
1529                                                 sizeof(attendees_string) - strlen(attendees_string),
1530                                                 "%s, ",
1531                                                 this_attendee
1532                                         );
1533                                         ++num_attendees;
1534                                 }
1535                         }
1536                 }
1537         }
1538
1539         lprintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1540
1541         /* If there are no attendees, there are no invitations to send, so...
1542          * don't bother putting one together!  Punch out, Maverick!
1543          */
1544         if (num_attendees == 0) {
1545                 icalcomponent_free(the_request);
1546                 return;
1547         }
1548
1549         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1550         encaps = icalcomponent_new_vcalendar();
1551         if (encaps == NULL) {
1552                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1553                         __FILE__, __LINE__);
1554                 icalcomponent_free(the_request);
1555                 return;
1556         }
1557
1558         /* Set the Product ID */
1559         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1560
1561         /* Set the Version Number */
1562         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1563
1564         /* Set the method to REQUEST */
1565         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1566
1567         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1568         ical_dezonify(the_request);
1569
1570         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1571          * are responsible for "the_request"'s memory -- it will be freed
1572          * when we free "encaps".
1573          */
1574         icalcomponent_add_component(encaps, the_request);
1575
1576         /* Serialize it */
1577         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1578         icalcomponent_free(encaps);     /* Don't need this anymore. */
1579         if (serialized_request == NULL) return;
1580
1581         request_message_text = malloc(strlen(serialized_request) + SIZ);
1582         if (request_message_text != NULL) {
1583                 sprintf(request_message_text,
1584                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1585                         serialized_request
1586                 );
1587
1588                 msg = CtdlMakeMessage(&CC->user,
1589                         "",                     /* No single recipient here */
1590                         "",                     /* No single recipient here */
1591                         CC->room.QRname, 0, FMT_RFC822,
1592                         "",
1593                         summary_string,         /* Use summary for subject */
1594                         NULL,
1595                         request_message_text);
1596
1597                 if (msg != NULL) {
1598                         valid = validate_recipients(attendees_string);
1599                         CtdlSubmitMsg(msg, valid, "");
1600                         CtdlFreeMessage(msg);
1601                 }
1602         }
1603         free(serialized_request);
1604 }
1605
1606
1607 /*
1608  * When a calendar object is being saved, determine whether it's a VEVENT
1609  * and the user saving it is the organizer.  If so, send out invitations
1610  * to any listed attendees.
1611  *
1612  */
1613 void ical_saving_vevent(icalcomponent *cal) {
1614         icalcomponent *c;
1615         icalproperty *organizer = NULL;
1616         char organizer_string[SIZ];
1617
1618         /* Don't send out invitations unless the client wants us to. */
1619         if (CIT_ICAL->server_generated_invitations == 0) {
1620                 return;
1621         }
1622
1623         /* Don't send out invitations if we've been asked not to. */
1624         if (CIT_ICAL->avoid_sending_invitations > 0) {
1625                 return;
1626         }
1627
1628         strcpy(organizer_string, "");
1629         /*
1630          * The VEVENT subcomponent is the one we're interested in.
1631          * Send out invitations if, and only if, this user is the Organizer.
1632          */
1633         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1634                 organizer = icalcomponent_get_first_property(cal,
1635                                                 ICAL_ORGANIZER_PROPERTY);
1636                 if (organizer != NULL) {
1637                         if (icalproperty_get_organizer(organizer)) {
1638                                 strcpy(organizer_string,
1639                                         icalproperty_get_organizer(organizer));
1640                         }
1641                 }
1642                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1643                         strcpy(organizer_string, &organizer_string[7]);
1644                         striplt(organizer_string);
1645                         /*
1646                          * If the user saving the event is listed as the
1647                          * organizer, then send out invitations.
1648                          */
1649                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
1650                                 ical_send_out_invitations(cal);
1651                         }
1652                 }
1653         }
1654
1655         /* If the component has subcomponents, recurse through them. */
1656         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1657             (c != NULL);
1658             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1659                 /* Recursively process subcomponent */
1660                 ical_saving_vevent(c);
1661         }
1662
1663 }
1664
1665
1666
1667 /*
1668  * Back end for ical_obj_beforesave()
1669  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1670  * the summary of the event (becomes message subject),
1671  * and the start time (becomes message date/time).
1672  */
1673 void ical_ctdl_set_exclusive_msgid(char *name, char *filename, char *partnum,
1674                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1675                 char *encoding, void *cbuserdata)
1676 {
1677         icalcomponent *cal, *nested_event, *nested_todo;
1678         icalproperty *p;
1679         struct icalmessagemod *imm;
1680         char new_uid[SIZ];
1681
1682         imm = (struct icalmessagemod *)cbuserdata;
1683
1684         /* If this is a text/calendar object, hunt for the UID and drop it in
1685          * the "user data" pointer for the MIME parser.  When
1686          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1687          * to that string.
1688          */
1689         if (!strcasecmp(cbtype, "text/calendar")) {
1690                 cal = icalcomponent_new_from_string(content);
1691                 if (cal != NULL) {
1692                         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1693                                 nested_event = icalcomponent_get_first_component(
1694                                         cal, ICAL_VEVENT_COMPONENT
1695                                 );
1696                                 nested_todo = icalcomponent_get_first_component(
1697                                         cal, ICAL_VTODO_COMPONENT
1698                                 );
1699                                 if (nested_event != NULL) {
1700                                         cal = nested_event;
1701                                 }
1702                                 else if (nested_todo != NULL) {
1703                                         cal = nested_todo;
1704                                 }
1705                         }
1706                 }
1707                 if (cal != NULL) {
1708                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1709                         if (p == NULL) {
1710                                 /* If there's no uid we must generate one */
1711                                 generate_uuid(new_uid);
1712                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
1713                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1714                         }
1715                         if (p != NULL) {
1716                                 strcpy(imm->uid, icalproperty_get_comment(p));
1717                                 /* strcpy(imm->subject, icalproperty_get_comment(p)); old aethera hack */
1718                         }
1719                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1720                         if (p != NULL) {
1721                                 strcpy(imm->subject, icalproperty_get_comment(p));
1722                         }
1723                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1724                         if (p != NULL) {
1725                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1726                         }
1727                         icalcomponent_free(cal);
1728                 }
1729         }
1730 }
1731
1732
1733
1734
1735
1736 /*
1737  * See if we need to prevent the object from being saved (we don't allow
1738  * MIME types other than text/calendar in "calendar" or "tasks"  rooms).  Also,
1739  * when saving an event to the calendar, set the message's Citadel exclusive
1740  * message ID to the UID of the object.  This causes our replication checker to
1741  * automatically delete any existing instances of the same object.  (Isn't
1742  * that cool?)
1743  *
1744  * We also set the message's Subject to the event summary, and the Date/time to
1745  * the event start time.
1746  */
1747 int ical_obj_beforesave(struct CtdlMessage *msg)
1748 {
1749         char *p;
1750         int a;
1751         struct icalmessagemod imm;
1752
1753         /* First determine if this is a calendar or tasks room */
1754         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1755            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1756                 return(0);              /* Not a vCalendar-centric room */
1757         }
1758
1759         /* It must be an RFC822 message! */
1760         if (msg->cm_format_type != 4) {
1761                 return 1;       /* You tried to save a non-RFC822 message! */
1762         }
1763
1764         /* Find the Content-Type: header */
1765         p = msg->cm_fields['M'];
1766         a = strlen(p);
1767         while (--a > 0) {
1768                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1769                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1770                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1771                                 mime_parser(msg->cm_fields['M'],
1772                                         NULL,
1773                                         *ical_ctdl_set_exclusive_msgid,
1774                                         NULL, NULL,
1775                                         (void *)&imm,
1776                                         0
1777                                 );
1778                                 if (strlen(imm.uid) > 0) {
1779                                         if (msg->cm_fields['E'] != NULL) {
1780                                                 free(msg->cm_fields['E']);
1781                                         }
1782                                         msg->cm_fields['E'] = strdup(imm.uid);
1783                                 }
1784                                 if (strlen(imm.subject) > 0) {
1785                                         if (msg->cm_fields['U'] != NULL) {
1786                                                 free(msg->cm_fields['U']);
1787                                         }
1788                                         msg->cm_fields['U'] = strdup(imm.subject);
1789                                 }
1790                                 if (imm.dtstart > 0) {
1791                                         if (msg->cm_fields['T'] != NULL) {
1792                                                 free(msg->cm_fields['T']);
1793                                         }
1794                                         msg->cm_fields['T'] = strdup("000000000000000000");
1795                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1796                                 }
1797                                 return 0;
1798                         }
1799                         else {
1800                                 return 1;
1801                         }
1802                 }
1803                 p++;
1804         }
1805
1806         /* Oops!  No Content-Type in this message!  How'd that happen? */
1807         lprintf(CTDL_ERR, "RFC822 message with no Content-Type header!\n");
1808         return 1;
1809 }
1810
1811
1812 /*
1813  * Things we need to do after saving a calendar event.
1814  */
1815 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1816                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1817                 char *encoding, void *cbuserdata)
1818 {
1819         icalcomponent *cal;
1820
1821         /* If this is a text/calendar object, hunt for the UID and drop it in
1822          * the "user data" pointer for the MIME parser.  When
1823          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1824          * to that string.
1825          */
1826         if (!strcasecmp(cbtype, "text/calendar")) {
1827                 cal = icalcomponent_new_from_string(content);
1828                 if (cal != NULL) {
1829                         ical_saving_vevent(cal);
1830                         icalcomponent_free(cal);
1831                 }
1832         }
1833 }
1834
1835
1836 /*
1837  * Things we need to do after saving a calendar event.
1838  */
1839 int ical_obj_aftersave(struct CtdlMessage *msg)
1840 {
1841         char roomname[ROOMNAMELEN];
1842         char *p;
1843         int a;
1844
1845         /*
1846          * If this isn't the Calendar> room, no further action is necessary.
1847          */
1848
1849         /* First determine if this is our room */
1850         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1851         if (strcasecmp(roomname, CC->room.QRname)) {
1852                 return 0;       /* It's not the Calendar room. */
1853         }
1854
1855         /* Then determine content-type of the message */
1856
1857         /* It must be an RFC822 message! */
1858         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1859         if (msg->cm_format_type != 4) return(1);
1860
1861         /* Find the Content-Type: header */
1862         p = msg->cm_fields['M'];
1863         a = strlen(p);
1864         while (--a > 0) {
1865                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1866                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1867                                 mime_parser(msg->cm_fields['M'],
1868                                         NULL,
1869                                         *ical_obj_aftersave_backend,
1870                                         NULL, NULL,
1871                                         NULL,
1872                                         0
1873                                 );
1874                                 return 0;
1875                         }
1876                         else {
1877                                 return 1;
1878                         }
1879                 }
1880                 p++;
1881         }
1882
1883         /* Oops!  No Content-Type in this message!  How'd that happen? */
1884         lprintf(CTDL_ERR, "RFC822 message with no Content-Type header!\n");
1885         return 1;
1886 }
1887
1888
1889 void ical_session_startup(void) {
1890         CIT_ICAL = malloc(sizeof(struct cit_ical));
1891         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1892 }
1893
1894 void ical_session_shutdown(void) {
1895         free(CIT_ICAL);
1896 }
1897
1898
1899 /*
1900  * Back end for ical_fixed_output()
1901  */
1902 void ical_fixed_output_backend(icalcomponent *cal,
1903                         int recursion_level
1904 ) {
1905         icalcomponent *c;
1906         icalproperty *method = NULL;
1907         icalproperty_method the_method = ICAL_METHOD_NONE;
1908         icalproperty *p;
1909         struct icaltimetype t;
1910         time_t tt;
1911         char buf[256];
1912
1913         /* Look for a method */
1914         method = icalcomponent_get_first_property(cal, ICAL_METHOD_PROPERTY);
1915
1916         /* See what we need to do with this */
1917         if (method != NULL) {
1918                 the_method = icalproperty_get_method(method);
1919                 switch(the_method) {
1920                     case ICAL_METHOD_REQUEST:
1921                         cprintf("Meeting invitation\n");
1922                         break;
1923                     case ICAL_METHOD_REPLY:
1924                         cprintf("Attendee's reply to your invitation\n");
1925                         break;
1926                     case ICAL_METHOD_PUBLISH:
1927                         cprintf("Published event\n");
1928                         break;
1929                     default:
1930                         cprintf("This is an unknown type of calendar item.\n");
1931                         break;
1932                 }
1933         }
1934
1935         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
1936         if (p != NULL) {
1937                 cprintf("Summary: %s\n", (const char *)icalproperty_get_comment(p));
1938         }
1939
1940         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
1941         if (p != NULL) {
1942                 cprintf("Location: %s\n", (const char *)icalproperty_get_comment(p));
1943         }
1944
1945         /*
1946          * Only show start/end times if we're actually looking at the VEVENT
1947          * component.  Otherwise it shows bogus dates for things like timezone.
1948          */
1949         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1950
1951                 p = icalcomponent_get_first_property(cal,
1952                                                 ICAL_DTSTART_PROPERTY);
1953                 if (p != NULL) {
1954                         t = icalproperty_get_dtstart(p);
1955
1956                         if (t.is_date) {
1957                                 cprintf("Date: %s %d, %d\n",
1958                                         ascmonths[t.month - 1],
1959                                         t.day, t.year
1960                                 );
1961                         }
1962                         else {
1963                                 tt = icaltime_as_timet(t);
1964                                 fmt_date(buf, sizeof buf, tt, 0);
1965                                 cprintf("Starting date/time: %s\n", buf);
1966                         }
1967                 }
1968
1969                 p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1970                 if (p != NULL) {
1971                         t = icalproperty_get_dtend(p);
1972                         tt = icaltime_as_timet(t);
1973                         fmt_date(buf, sizeof buf, tt, 0);
1974                         cprintf("Ending date/time: %s\n", buf);
1975                 }
1976
1977         }
1978
1979         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
1980         if (p != NULL) {
1981                 cprintf("Description: %s\n", (const char *)icalproperty_get_comment(p));
1982         }
1983
1984         /* If the component has attendees, iterate through them. */
1985         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
1986                 cprintf("Attendee: ");
1987                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
1988                 if (!strncasecmp(buf, "MAILTO:", 7)) {
1989
1990                         /* screen name or email address */
1991                         strcpy(buf, &buf[7]);
1992                         striplt(buf);
1993                         cprintf("%s ", buf);
1994                 }
1995                 cprintf("\n");
1996         }
1997
1998         /* If the component has subcomponents, recurse through them. */
1999         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2000             (c != 0);
2001             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2002                 /* Recursively process subcomponent */
2003                 ical_fixed_output_backend(c, recursion_level+1);
2004         }
2005 }
2006
2007
2008
2009 /*
2010  * Function to output a calendar item  as plain text.  Nobody uses MSG0
2011  * anymore, so really this is just so we expose the vCard data to the full
2012  * text indexer.
2013  */
2014 void ical_fixed_output(char *ptr, int len) {
2015         icalcomponent *cal;
2016         char *stringy_cal;
2017
2018         stringy_cal = malloc(len + 1);
2019         safestrncpy(stringy_cal, ptr, len + 1);
2020         cal = icalcomponent_new_from_string(stringy_cal);
2021         free(stringy_cal);
2022
2023         if (cal == NULL) {
2024                 cprintf("There was an error parsing this calendar item.\n");
2025                 return;
2026         }
2027
2028         ical_dezonify(cal);
2029         ical_fixed_output_backend(cal, 0);
2030
2031         /* Free the memory we obtained from libical's constructor */
2032         icalcomponent_free(cal);
2033 }
2034
2035
2036 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
2037
2038 /*
2039  * Register this module with the Citadel server.
2040  */
2041 char *serv_calendar_init(void)
2042 {
2043 #ifdef CITADEL_WITH_CALENDAR_SERVICE
2044         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2045         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2046         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2047         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2048         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2049         CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2050         CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2051 #endif
2052         return "$Id$";
2053 }