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         strcpy(temp, tmpnam(NULL));
 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, organizer_string,
 319                         CC->room.QRname, 0, FMT_RFC822,
 320                         "",
 321                         summary_string,         /* Use summary for subject */
 322                         reply_message_text);
 323
 324                 if (msg != NULL) {
 325                         valid = validate_recipients(organizer_string);
 326                         CtdlSubmitMsg(msg, valid, "");
 327                         CtdlFreeMessage(msg);
 328                 }
 329         }
 330         free(serialized_reply);
 331 }
 332
 333
 334
 335 /*
 336  * Callback function for mime parser that hunts for calendar content types
 337  * and turns them into calendar objects
 338  */
 339 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 340                 void *content, char *cbtype, size_t length, char *encoding,
 341                 void *cbuserdata) {
 342
 343         struct ical_respond_data *ird = NULL;
 344
 345         ird = (struct ical_respond_data *) cbuserdata;
 346
 347         /* desired_partnum can be set to "_HUNT_" to have it just look for
 348          * the first part with a content type of text/calendar.  Otherwise
 349          * we have to only process the right one.
 350          */
 351         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 352                 if (strcasecmp(partnum, ird->desired_partnum)) {
 353                         return;
 354                 }
 355         }
 356
 357         if (strcasecmp(cbtype, "text/calendar")) {
 358                 return;
 359         }
 360
 361         if (ird->cal != NULL) {
 362                 icalcomponent_free(ird->cal);
 363                 ird->cal = NULL;
 364         }
 365
 366         ird->cal = icalcomponent_new_from_string(content);
 367         if (ird->cal != NULL) {
 368                 ical_dezonify(ird->cal);
 369         }
 370 }
 371
 372
 373 /*
 374  * Respond to a meeting request.
 375  */
 376 void ical_respond(long msgnum, char *partnum, char *action) {
 377         struct CtdlMessage *msg;
 378         struct ical_respond_data ird;
 379
 380         if (
 381            (strcasecmp(action, "accept"))
 382            && (strcasecmp(action, "decline"))
 383         ) {
 384                 cprintf("%d Action must be 'accept' or 'decline'\n",
 385                         ERROR + ILLEGAL_VALUE
 386                 );
 387                 return;
 388         }
 389
 390         msg = CtdlFetchMessage(msgnum, 1);
 391         if (msg == NULL) {
 392                 cprintf("%d Message %ld not found.\n",
 393                         ERROR + ILLEGAL_VALUE,
 394                         (long)msgnum
 395                 );
 396                 return;
 397         }
 398
 399         memset(&ird, 0, sizeof ird);
 400         strcpy(ird.desired_partnum, partnum);
 401         mime_parser(msg->cm_fields['M'],
 402                 NULL,
 403                 *ical_locate_part,              /* callback function */
 404                 NULL, NULL,
 405                 (void *) &ird,                  /* user data */
 406                 0
 407         );
 408
 409         /* We're done with the incoming message, because we now have a
 410          * calendar object in memory.
 411          */
 412         CtdlFreeMessage(msg);
 413
 414         /*
 415          * Here is the real meat of this function.  Handle the event.
 416          */
 417         if (ird.cal != NULL) {
 418                 /* Save this in the user's calendar if necessary */
 419                 if (!strcasecmp(action, "accept")) {
 420                         ical_add(ird.cal, 0);
 421                 }
 422
 423                 /* Send a reply if necessary */
 424                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 425                         ical_send_a_reply(ird.cal, action);
 426                 }
 427
 428                 /* Now that we've processed this message, we don't need it
 429                  * anymore.  So delete it.
 430                  */
 431                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 432
 433                 /* Free the memory we allocated and return a response. */
 434                 icalcomponent_free(ird.cal);
 435                 ird.cal = NULL;
 436                 cprintf("%d ok\n", CIT_OK);
 437                 return;
 438         }
 439         else {
 440                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 441                 return;
 442         }
 443
 444         /* should never get here */
 445 }
 446
 447
 448 /*
 449  * Figure out the UID of the calendar event being referred to in a
 450  * REPLY object.  This function is recursive.
 451  */
 452 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 453         icalcomponent *subcomponent;
 454         icalproperty *p;
 455
 456         /* If this object is a REPLY, then extract the UID. */
 457         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 458                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 459                 if (p != NULL) {
 460                         strcpy(uidbuf, icalproperty_get_comment(p));
 461                 }
 462         }
 463
 464         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 465          * UID of the reply; we want the UID of the invitation being replied to.
 466          */
 467         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 468             subcomponent != NULL;
 469             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 470                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 471         }
 472 }
 473
 474
 475 /*
 476  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 477  * locate the message containing the calendar event we're replying to, this function
 478  * gets called.  It basically just sticks the message number in a supplied buffer.
 479  */
 480 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 481         long *msgnumptr;
 482
 483         msgnumptr = (long *) data;
 484         *msgnumptr = msgnum;
 485 }
 486
 487
 488 struct original_event_container {
 489         icalcomponent *c;
 490 };
 491
 492 /*
 493  * Callback function for mime parser that hunts for calendar content types
 494  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 495  * to fetch the object being updated)
 496  */
 497 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 498                 void *content, char *cbtype, size_t length, char *encoding,
 499                 void *cbuserdata) {
 500
 501         struct original_event_container *oec = NULL;
 502
 503         if (strcasecmp(cbtype, "text/calendar")) {
 504                 return;
 505         }
 506         oec = (struct original_event_container *) cbuserdata;
 507         if (oec->c != NULL) {
 508                 icalcomponent_free(oec->c);
 509         }
 510         oec->c = icalcomponent_new_from_string(content);
 511 }
 512
 513
 514 /*
 515  * Merge updated attendee information from a REPLY into an existing event.
 516  */
 517 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 518         icalcomponent *c;
 519         icalproperty *e_attendee, *r_attendee;
 520
 521         /* First things first.  If we're not looking at a VEVENT component,
 522          * recurse through subcomponents until we find one.
 523          */
 524         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 525                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 526                     c != NULL;
 527                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 528                         ical_merge_attendee_reply(c, reply);
 529                 }
 530                 return;
 531         }
 532
 533         /* Now do the same thing with the reply.
 534          */
 535         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 536                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 537                     c != NULL;
 538                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 539                         ical_merge_attendee_reply(event, c);
 540                 }
 541                 return;
 542         }
 543
 544         /* Clone the reply, because we're going to rip its guts out. */
 545         reply = icalcomponent_new_clone(reply);
 546
 547         /* At this point we're looking at the correct subcomponents.
 548          * Iterate through the attendees looking for a match.
 549          */
 550 STARTOVER:
 551         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 552             e_attendee != NULL;
 553             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 554
 555                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 556                     r_attendee != NULL;
 557                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 558
 559                         /* Check to see if these two attendees match...
 560                          */
 561                         if (!strcasecmp(
 562                            icalproperty_get_attendee(e_attendee),
 563                            icalproperty_get_attendee(r_attendee)
 564                         )) {
 565                                 /* ...and if they do, remove the attendee from the event
 566                                  * and replace it with the attendee from the reply.  (The
 567                                  * reply's copy will have the same address, but an updated
 568                                  * status.)
 569                                  */
 570                                 TRACE;
 571                                 icalcomponent_remove_property(event, e_attendee);
 572                                 TRACE;
 573                                 icalproperty_free(e_attendee);
 574                                 TRACE;
 575                                 icalcomponent_remove_property(reply, r_attendee);
 576                                 TRACE;
 577                                 icalcomponent_add_property(event, r_attendee);
 578                                 TRACE;
 579
 580                                 /* Since we diddled both sets of attendees, we have to start
 581                                  * the iteration over again.  This will not create an infinite
 582                                  * loop because we removed the attendee from the reply.  (That's
 583                                  * why we cloned the reply, and that's what we mean by "ripping
 584                                  * its guts out.")
 585                                  */
 586                                 goto STARTOVER;
 587                         }
 588
 589                 }
 590         }
 591
 592         /* Free the *clone* of the reply. */
 593         icalcomponent_free(reply);
 594 }
 595
 596
 597
 598
 599 /*
 600  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 601  * calendar event.  The object has already been deserialized for us; all
 602  * we have to do here is hunt for the event in our calendar, merge in the
 603  * updated attendee status, and save it again.
 604  *
 605  * This function returns 0 on success, 1 if the event was not found in the
 606  * user's calendar, or 2 if an internal error occurred.
 607  */
 608 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 609         char uid[SIZ];
 610         char hold_rm[ROOMNAMELEN];
 611         long msgnum_being_replaced = 0;
 612         struct CtdlMessage *template = NULL;
 613         struct CtdlMessage *msg;
 614         struct original_event_container oec;
 615         icalcomponent *original_event;
 616         char *serialized_event = NULL;
 617         char roomname[ROOMNAMELEN];
 618         char *message_text = NULL;
 619
 620         /* Figure out just what event it is we're dealing with */
 621         strcpy(uid, "--==<< InVaLiD uId >>==--");
 622         ical_learn_uid_of_reply(uid, cal);
 623         lprintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 624
 625         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 626
 627         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 628                 getroom(&CC->room, hold_rm);
 629                 lprintf(CTDL_CRIT, "cannot get user calendar room\n");
 630                 return(2);
 631         }
 632
 633         /*
 634          * Pound through the user's calendar looking for a message with
 635          * the Citadel EUID set to the value we're looking for.  Since
 636          * Citadel always sets the message EUID to the vCalendar UID of
 637          * the event, this will work.
 638          */
 639         template = (struct CtdlMessage *)
 640                 malloc(sizeof(struct CtdlMessage));
 641         memset(template, 0, sizeof(struct CtdlMessage));
 642         template->cm_fields['E'] = strdup(uid);
 643         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 644                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 645         CtdlFreeMessage(template);
 646         getroom(&CC->room, hold_rm);    /* return to saved room */
 647
 648         lprintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 649         if (msgnum_being_replaced == 0) {
 650                 return(1);                      /* no calendar event found */
 651         }
 652
 653         /* Now we know the ID of the message containing the event being updated.
 654          * We don't actually have to delete it; that'll get taken care of by the
 655          * server when we save another event with the same UID.  This just gives
 656          * us the ability to load the event into memory so we can diddle the
 657          * attendees.
 658          */
 659         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 660         if (msg == NULL) {
 661                 return(2);                      /* internal error */
 662         }
 663         oec.c = NULL;
 664         mime_parser(msg->cm_fields['M'],
 665                 NULL,
 666                 *ical_locate_original_event,    /* callback function */
 667                 NULL, NULL,
 668                 &oec,                           /* user data */
 669                 0
 670         );
 671         CtdlFreeMessage(msg);
 672
 673         original_event = oec.c;
 674         if (original_event == NULL) {
 675                 lprintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 676                 return(2);
 677         }
 678
 679         /* Merge the attendee's updated status into the event */
 680         ical_merge_attendee_reply(original_event, cal);
 681
 682         /* Serialize it */
 683         serialized_event = strdup(icalcomponent_as_ical_string(original_event));
 684         icalcomponent_free(original_event);     /* Don't need this anymore. */
 685         if (serialized_event == NULL) return(2);
 686
 687         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 688
 689         message_text = malloc(strlen(serialized_event) + SIZ);
 690         if (message_text != NULL) {
 691                 sprintf(message_text,
 692                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 693                         serialized_event
 694                 );
 695
 696                 msg = CtdlMakeMessage(&CC->user,
 697                         "",                     /* No recipient */
 698                         roomname,
 699                         0, FMT_RFC822,
 700                         "",
 701                         "",             /* no subject */
 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, "");
 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[SIZ];
1184         char host[SIZ];
1185         char type[SIZ];
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');
1227                         extract_token(host, buf, 0, '|');
1228                         extract_token(type, buf, 1, '|');
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[SIZ];
1345         long msgnum;
1346         char partnum[SIZ];
1347         char action[SIZ];
1348         char who[SIZ];
1349
1350         extract(subcmd, argbuf, 0);
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(who, argbuf, 1);
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(partnum, argbuf, 2);
1378                 extract(action, argbuf, 3);
1379                 ical_respond(msgnum, partnum, action);
1380                 return;
1381         }
1382
1383         if (!strcasecmp(subcmd, "handle_rsvp")) {
1384                 msgnum = extract_long(argbuf, 1);
1385                 extract(partnum, argbuf, 2);
1386                 extract(action, argbuf, 3);
1387                 ical_handle_rsvp(msgnum, partnum, action);
1388                 return;
1389         }
1390
1391         if (!strcasecmp(subcmd, "conflicts")) {
1392                 msgnum = extract_long(argbuf, 1);
1393                 extract(partnum, argbuf, 2);
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);
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 = 3;   /* 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 = 3;        /* 3 = 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);
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 = 4;   /* 4 = tasks view */
1438         lputroom(&qr);
1439
1440         /* Set the view to a task list view */
1441         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1442         vbuf.v_view = 4;        /* 4 = tasks */
1443         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1444
1445         return;
1446 }
1447
1448
1449 /*
1450  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1451  * finds a VEVENT.
1452  */
1453 void ical_send_out_invitations(icalcomponent *cal) {
1454         icalcomponent *the_request = NULL;
1455         char *serialized_request = NULL;
1456         icalcomponent *encaps = NULL;
1457         char *request_message_text = NULL;
1458         struct CtdlMessage *msg = NULL;
1459         struct recptypes *valid = NULL;
1460         char attendees_string[SIZ];
1461         int num_attendees = 0;
1462         char this_attendee[SIZ];
1463         icalproperty *attendee = NULL;
1464         char summary_string[SIZ];
1465         icalproperty *summary = NULL;
1466
1467         if (cal == NULL) {
1468                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1469                 return;
1470         }
1471
1472
1473         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1474         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1475                 ical_send_out_invitations(
1476                         icalcomponent_get_first_component(
1477                                 cal, ICAL_VEVENT_COMPONENT
1478                         )
1479                 );
1480                 return;
1481         }
1482
1483         /* Clone the event */
1484         the_request = icalcomponent_new_clone(cal);
1485         if (the_request == NULL) {
1486                 lprintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1487                 return;
1488         }
1489
1490         /* Extract the summary string -- we'll use it as the
1491          * message subject for the request
1492          */
1493         strcpy(summary_string, "Meeting request");
1494         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1495         if (summary != NULL) {
1496                 if (icalproperty_get_summary(summary)) {
1497                         strcpy(summary_string,
1498                                 icalproperty_get_summary(summary) );
1499                 }
1500         }
1501
1502         /* Determine who the recipients of this message are (the attendees) */
1503         strcpy(attendees_string, "");
1504         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1505                 if (icalproperty_get_attendee(attendee)) {
1506                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1507                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1508                                 strcpy(this_attendee, &this_attendee[7]);
1509
1510                                 if (!CtdlIsMe(this_attendee)) { /* don't send an invitation to myself! */
1511                                         snprintf(&attendees_string[strlen(attendees_string)],
1512                                                 sizeof(attendees_string) - strlen(attendees_string),
1513                                                 "%s, ",
1514                                                 this_attendee
1515                                         );
1516                                         ++num_attendees;
1517                                 }
1518                         }
1519                 }
1520         }
1521
1522         lprintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1523
1524         /* If there are no attendees, there are no invitations to send, so...
1525          * don't bother putting one together!  Punch out, Maverick!
1526          */
1527         if (num_attendees == 0) {
1528                 icalcomponent_free(the_request);
1529                 return;
1530         }
1531
1532         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1533         encaps = icalcomponent_new_vcalendar();
1534         if (encaps == NULL) {
1535                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1536                         __FILE__, __LINE__);
1537                 icalcomponent_free(the_request);
1538                 return;
1539         }
1540
1541         /* Set the Product ID */
1542         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1543
1544         /* Set the Version Number */
1545         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1546
1547         /* Set the method to REQUEST */
1548         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1549
1550         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1551         ical_dezonify(the_request);
1552
1553         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1554          * are responsible for "the_request"'s memory -- it will be freed
1555          * when we free "encaps".
1556          */
1557         icalcomponent_add_component(encaps, the_request);
1558
1559         /* Serialize it */
1560         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1561         icalcomponent_free(encaps);     /* Don't need this anymore. */
1562         if (serialized_request == NULL) return;
1563
1564         request_message_text = malloc(strlen(serialized_request) + SIZ);
1565         if (request_message_text != NULL) {
1566                 sprintf(request_message_text,
1567                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1568                         serialized_request
1569                 );
1570
1571                 msg = CtdlMakeMessage(&CC->user,
1572                         "",                     /* No single recipient here */
1573                         CC->room.QRname, 0, FMT_RFC822,
1574                         "",
1575                         summary_string,         /* Use summary for subject */
1576                         request_message_text);
1577
1578                 if (msg != NULL) {
1579                         valid = validate_recipients(attendees_string);
1580                         CtdlSubmitMsg(msg, valid, "");
1581                         CtdlFreeMessage(msg);
1582                 }
1583         }
1584         free(serialized_request);
1585 }
1586
1587
1588 /*
1589  * When a calendar object is being saved, determine whether it's a VEVENT
1590  * and the user saving it is the organizer.  If so, send out invitations
1591  * to any listed attendees.
1592  *
1593  */
1594 void ical_saving_vevent(icalcomponent *cal) {
1595         icalcomponent *c;
1596         icalproperty *organizer = NULL;
1597         char organizer_string[SIZ];
1598
1599         /* Don't send out invitations unless the client wants us to. */
1600         if (CIT_ICAL->server_generated_invitations == 0) {
1601                 return;
1602         }
1603
1604         /* Don't send out invitations if we've been asked not to. */
1605         if (CIT_ICAL->avoid_sending_invitations > 0) {
1606                 return;
1607         }
1608
1609         strcpy(organizer_string, "");
1610         /*
1611          * The VEVENT subcomponent is the one we're interested in.
1612          * Send out invitations if, and only if, this user is the Organizer.
1613          */
1614         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1615                 organizer = icalcomponent_get_first_property(cal,
1616                                                 ICAL_ORGANIZER_PROPERTY);
1617                 if (organizer != NULL) {
1618                         if (icalproperty_get_organizer(organizer)) {
1619                                 strcpy(organizer_string,
1620                                         icalproperty_get_organizer(organizer));
1621                         }
1622                 }
1623                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1624                         strcpy(organizer_string, &organizer_string[7]);
1625                         striplt(organizer_string);
1626                         /*
1627                          * If the user saving the event is listed as the
1628                          * organizer, then send out invitations.
1629                          */
1630                         if (CtdlIsMe(organizer_string)) {
1631                                 ical_send_out_invitations(cal);
1632                         }
1633                 }
1634         }
1635
1636         /* If the component has subcomponents, recurse through them. */
1637         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1638             (c != NULL);
1639             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1640                 /* Recursively process subcomponent */
1641                 ical_saving_vevent(c);
1642         }
1643
1644 }
1645
1646
1647
1648 /*
1649  * Back end for ical_obj_beforesave()
1650  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1651  * the summary of the event (becomes message subject),
1652  * and the start time (becomes message date/time).
1653  */
1654 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1655                 char *disp, void *content, char *cbtype, size_t length,
1656                 char *encoding, void *cbuserdata)
1657 {
1658         icalcomponent *cal;
1659         icalproperty *p;
1660         struct icalmessagemod *imm;
1661
1662         imm = (struct icalmessagemod *)cbuserdata;
1663
1664         /* If this is a text/calendar object, hunt for the UID and drop it in
1665          * the "user data" pointer for the MIME parser.  When
1666          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1667          * to that string.
1668          */
1669         if (!strcasecmp(cbtype, "text/calendar")) {
1670                 cal = icalcomponent_new_from_string(content);
1671                 if (cal != NULL) {
1672                         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1673                                 cal = icalcomponent_get_first_component(
1674                                         cal, ICAL_VEVENT_COMPONENT
1675                                 );
1676                         }
1677                 }
1678                 if (cal != NULL) {
1679                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1680                         if (p != NULL) {
1681                                 strcpy(imm->uid, icalproperty_get_comment(p));
1682                         }
1683                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1684                         if (p != NULL) {
1685                                 strcpy(imm->subject,
1686                                                 icalproperty_get_comment(p));
1687                         }
1688                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1689                         if (p != NULL) {
1690                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1691                         }
1692                         icalcomponent_free(cal);
1693                 }
1694         }
1695 }
1696
1697
1698
1699
1700
1701 /*
1702  * See if we need to prevent the object from being saved (we don't allow
1703  * MIME types other than text/calendar in the Calendar> room).  Also, when
1704  * saving an event to the calendar, set the message's Citadel extended message
1705  * ID to the UID of the object.  This causes our replication checker to
1706  * automatically delete any existing instances of the same object.  (Isn't
1707  * that cool?)
1708  *
1709  * We also set the message's Subject to the event summary, and the Date/time to
1710  * the event start time.
1711  */
1712 int ical_obj_beforesave(struct CtdlMessage *msg)
1713 {
1714         char roomname[ROOMNAMELEN];
1715         char *p;
1716         int a;
1717         struct icalmessagemod imm;
1718
1719         /*
1720          * Only messages with content-type text/calendar
1721          * may be saved to Calendar>.  If the message is bound for
1722          * Calendar> but doesn't have this content-type, throw an error
1723          * so that the message may not be posted.
1724          */
1725
1726         /* First determine if this is our room */
1727         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1728         if (strcasecmp(roomname, CC->room.QRname)) {
1729                 return 0;       /* It's not the Calendar room. */
1730         }
1731
1732         /* Then determine content-type of the message */
1733
1734         /* It must be an RFC822 message! */
1735         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1736         if (msg->cm_format_type != 4)
1737                 return 1;       /* You tried to save a non-RFC822 message! */
1738
1739         /* Find the Content-Type: header */
1740         p = msg->cm_fields['M'];
1741         a = strlen(p);
1742         while (--a > 0) {
1743                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1744                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1745                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1746                                 mime_parser(msg->cm_fields['M'],
1747                                         NULL,
1748                                         *ical_ctdl_set_extended_msgid,
1749                                         NULL, NULL,
1750                                         (void *)&imm,
1751                                         0
1752                                 );
1753                                 if (strlen(imm.uid) > 0) {
1754                                         if (msg->cm_fields['E'] != NULL) {
1755                                                 free(msg->cm_fields['E']);
1756                                         }
1757                                         msg->cm_fields['E'] = strdup(imm.uid);
1758                                 }
1759                                 if (strlen(imm.subject) > 0) {
1760                                         if (msg->cm_fields['U'] != NULL) {
1761                                                 free(msg->cm_fields['U']);
1762                                         }
1763                                         msg->cm_fields['U'] = strdup(imm.subject);
1764                                 }
1765                                 if (imm.dtstart > 0) {
1766                                         if (msg->cm_fields['T'] != NULL) {
1767                                                 free(msg->cm_fields['T']);
1768                                         }
1769                                         msg->cm_fields['T'] = strdup("000000000000000000");
1770                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1771                                 }
1772                                 return 0;
1773                         }
1774                         else {
1775                                 return 1;
1776                         }
1777                 }
1778                 p++;
1779         }
1780
1781         /* Oops!  No Content-Type in this message!  How'd that happen? */
1782         lprintf(CTDL_ERR, "RFC822 message with no Content-Type header!\n");
1783         return 1;
1784 }
1785
1786
1787 /*
1788  * Things we need to do after saving a calendar event.
1789  */
1790 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1791                 char *disp, void *content, char *cbtype, size_t length,
1792                 char *encoding, void *cbuserdata)
1793 {
1794         icalcomponent *cal;
1795
1796         /* If this is a text/calendar object, hunt for the UID and drop it in
1797          * the "user data" pointer for the MIME parser.  When
1798          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1799          * to that string.
1800          */
1801         if (!strcasecmp(cbtype, "text/calendar")) {
1802                 cal = icalcomponent_new_from_string(content);
1803                 if (cal != NULL) {
1804                         ical_saving_vevent(cal);
1805                         icalcomponent_free(cal);
1806                 }
1807         }
1808 }
1809
1810
1811 /*
1812  * Things we need to do after saving a calendar event.
1813  */
1814 int ical_obj_aftersave(struct CtdlMessage *msg)
1815 {
1816         char roomname[ROOMNAMELEN];
1817         char *p;
1818         int a;
1819
1820         /*
1821          * If this isn't the Calendar> room, no further action is necessary.
1822          */
1823
1824         /* First determine if this is our room */
1825         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1826         if (strcasecmp(roomname, CC->room.QRname)) {
1827                 return 0;       /* It's not the Calendar room. */
1828         }
1829
1830         /* Then determine content-type of the message */
1831
1832         /* It must be an RFC822 message! */
1833         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1834         if (msg->cm_format_type != 4) return(1);
1835
1836         /* Find the Content-Type: header */
1837         p = msg->cm_fields['M'];
1838         a = strlen(p);
1839         while (--a > 0) {
1840                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1841                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1842                                 mime_parser(msg->cm_fields['M'],
1843                                         NULL,
1844                                         *ical_obj_aftersave_backend,
1845                                         NULL, NULL,
1846                                         NULL,
1847                                         0
1848                                 );
1849                                 return 0;
1850                         }
1851                         else {
1852                                 return 1;
1853                         }
1854                 }
1855                 p++;
1856         }
1857
1858         /* Oops!  No Content-Type in this message!  How'd that happen? */
1859         lprintf(CTDL_ERR, "RFC822 message with no Content-Type header!\n");
1860         return 1;
1861 }
1862
1863
1864 void ical_session_startup(void) {
1865         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1866         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1867 }
1868
1869
1870 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
1871
1872 /*
1873  * Register this module with the Citadel server.
1874  */
1875 char *serv_calendar_init(void)
1876 {
1877 #ifdef CITADEL_WITH_CALENDAR_SERVICE
1878         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1879         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1880         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1881         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1882         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1883 #endif
1884         return "$Id$";
1885 }