citadel/serv_calendar.c

   1 /*
   2  * $Id$
   3  *
   4  * This module implements iCalendar object processing and the Calendar>
   5  * room on a Citadel/UX server.  It handles iCalendar objects using the
   6  * iTIP protocol.  See RFCs 2445 and 2446.
   7  *
   8  */
   9
  10 #define PRODID "-//Citadel//NONSGML Citadel Calendar//EN"
  11
  12 #include "sysdep.h"
  13 #include <unistd.h>
  14 #include <sys/types.h>
  15 #include <limits.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #ifdef HAVE_STRINGS_H
  19 #include <strings.h>
  20 #endif
  21 #include "citadel.h"
  22 #include "server.h"
  23 #include "citserver.h"
  24 #include "sysdep_decls.h"
  25 #include "support.h"
  26 #include "config.h"
  27 #include "serv_extensions.h"
  28 #include "user_ops.h"
  29 #include "room_ops.h"
  30 #include "tools.h"
  31 #include "msgbase.h"
  32 #include "mime_parser.h"
  33 #include "serv_calendar.h"
  34
  35 #ifdef CITADEL_WITH_CALENDAR_SERVICE
  36
  37 #include <ical.h>
  38 #include "ical_dezonify.h"
  39
  40 struct ical_respond_data {
  41         char desired_partnum[SIZ];
  42         icalcomponent *cal;
  43 };
  44
  45 /* Session-local data for calendaring. */
  46 long SYM_CIT_ICAL;
  47
  48
  49 /*
  50  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  51  */
  52 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  53         icalcomponent *encaps;
  54
  55         /* If we're already looking at a full VCALENDAR component,
  56          * don't bother ... just return itself.
  57          */
  58         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  59                 return subcomp;
  60         }
  61
  62         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  63         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
  64         if (encaps == NULL) {
  65                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
  66                         __FILE__, __LINE__);
  67                 return NULL;
  68         }
  69
  70         /* Set the Product ID */
  71         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  72
  73         /* Set the Version Number */
  74         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  75
  76         /* Encapsulate the subcomponent inside */
  77         icalcomponent_add_component(encaps, subcomp);
  78
  79         /* Convert all timestamps to UTC so we don't have to deal with
  80          * stupid VTIMEZONE crap.
  81          */
  82         ical_dezonify(encaps);
  83
  84         /* Return the object we just created. */
  85         return(encaps);
  86 }
  87
  88
  89
  90
  91 /*
  92  * Write a calendar object into the specified user's calendar room.
  93  *
  94  * ok
  95  */
  96 void ical_write_to_cal(struct usersupp *u, icalcomponent *cal) {
  97         char temp[PATH_MAX];
  98         FILE *fp;
  99         char *ser;
 100         icalcomponent *encaps;
 101
 102         if (cal == NULL) return;
 103
 104         /* If the supplied object is a subcomponent, encapsulate it in
 105          * a full VCALENDAR component, and save that instead.
 106          */
 107         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 108                 encaps = ical_encapsulate_subcomponent(
 109                         icalcomponent_new_clone(cal)
 110                 );
 111                 ical_write_to_cal(u, encaps);
 112                 icalcomponent_free(encaps);
 113                 return;
 114         }
 115
 116         strcpy(temp, tmpnam(NULL));
 117         ser = icalcomponent_as_ical_string(cal);
 118         if (ser == NULL) return;
 119
 120         /* Make a temp file out of it */
 121         fp = fopen(temp, "w");
 122         if (fp == NULL) return;
 123         fwrite(ser, strlen(ser), 1, fp);
 124         fclose(fp);
 125
 126         /* This handy API function does all the work for us.
 127          */
 128         CtdlWriteObject(USERCALENDARROOM,       /* which room */
 129                         "text/calendar",        /* MIME type */
 130                         temp,                   /* temp file */
 131                         u,                      /* which user */
 132                         0,                      /* not binary */
 133                         0,              /* don't delete others of this type */
 134                         0);                     /* no flags */
 135
 136         unlink(temp);
 137 }
 138
 139
 140 /*
 141  * Add a calendar object to the user's calendar
 142  *
 143  * ok because it uses ical_write_to_cal()
 144  */
 145 void ical_add(icalcomponent *cal, int recursion_level) {
 146         icalcomponent *c;
 147
 148         /*
 149          * The VEVENT subcomponent is the one we're interested in saving.
 150          */
 151         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 152
 153                 ical_write_to_cal(&CC->usersupp, cal);
 154
 155         }
 156
 157         /* If the component has subcomponents, recurse through them. */
 158         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 159             (c != 0);
 160             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 161                 /* Recursively process subcomponent */
 162                 ical_add(c, recursion_level+1);
 163         }
 164
 165 }
 166
 167
 168
 169 /*
 170  * Send a reply to a meeting invitation.
 171  *
 172  * 'request' is the invitation to reply to.
 173  * 'action' is the string "accept" or "decline".
 174  *
 175  * (Sorry about this being more than 80 columns ... there was just
 176  * no easy way to break it down sensibly.)
 177  *
 178  * ok
 179  */
 180 void ical_send_a_reply(icalcomponent *request, char *action) {
 181         icalcomponent *the_reply = NULL;
 182         icalcomponent *vevent = NULL;
 183         icalproperty *attendee = NULL;
 184         char attendee_string[SIZ];
 185         icalproperty *organizer = NULL;
 186         char organizer_string[SIZ];
 187         icalproperty *summary = NULL;
 188         char summary_string[SIZ];
 189         icalproperty *me_attend = NULL;
 190         struct recptypes *recp = NULL;
 191         icalparameter *partstat = NULL;
 192         char *serialized_reply = NULL;
 193         char *reply_message_text = NULL;
 194         struct CtdlMessage *msg = NULL;
 195         struct recptypes *valid = NULL;
 196
 197         strcpy(organizer_string, "");
 198         strcpy(summary_string, "Calendar item");
 199
 200         if (request == NULL) {
 201                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 202                 return;
 203         }
 204
 205         the_reply = icalcomponent_new_clone(request);
 206         if (the_reply == NULL) {
 207                 lprintf(3, "ERROR: cannot clone request\n");
 208                 return;
 209         }
 210
 211         /* Change the method from REQUEST to REPLY */
 212         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 213
 214         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 215         if (vevent != NULL) {
 216                 /* Hunt for attendees, removing ones that aren't us.
 217                  * (Actually, remove them all, cloning our own one so we can
 218                  * re-insert it later)
 219                  */
 220                 while (attendee = icalcomponent_get_first_property(vevent,
 221                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 222                 ) {
 223                         if (icalproperty_get_attendee(attendee)) {
 224                                 strcpy(attendee_string,
 225                                         icalproperty_get_attendee(attendee) );
 226                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 227                                         strcpy(attendee_string, &attendee_string[7]);
 228                                         striplt(attendee_string);
 229                                         recp = validate_recipients(attendee_string);
 230                                         if (recp != NULL) {
 231                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 232                                                         if (me_attend) icalproperty_free(me_attend);
 233                                                         me_attend = icalproperty_new_clone(attendee);
 234                                                 }
 235                                                 phree(recp);
 236                                         }
 237                                 }
 238                         }
 239                         /* Remove it... */
 240                         icalcomponent_remove_property(vevent, attendee);
 241                         icalproperty_free(attendee);
 242                 }
 243
 244                 /* We found our own address in the attendee list. */
 245                 if (me_attend) {
 246                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 247                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 248
 249                         if (!strcasecmp(action, "accept")) {
 250                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 251                         }
 252                         else if (!strcasecmp(action, "decline")) {
 253                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 254                         }
 255                         else if (!strcasecmp(action, "tentative")) {
 256                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 257                         }
 258
 259                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 260
 261                         /* Now insert it back into the vevent. */
 262                         icalcomponent_add_property(vevent, me_attend);
 263                 }
 264
 265                 /* Figure out who to send this thing to */
 266                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 267                 if (organizer != NULL) {
 268                         if (icalproperty_get_organizer(organizer)) {
 269                                 strcpy(organizer_string,
 270                                         icalproperty_get_organizer(organizer) );
 271                         }
 272                 }
 273                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 274                         strcpy(organizer_string, &organizer_string[7]);
 275                         striplt(organizer_string);
 276                 } else {
 277                         strcpy(organizer_string, "");
 278                 }
 279
 280                 /* Extract the summary string -- we'll use it as the
 281                  * message subject for the reply
 282                  */
 283                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 284                 if (summary != NULL) {
 285                         if (icalproperty_get_summary(summary)) {
 286                                 strcpy(summary_string,
 287                                         icalproperty_get_summary(summary) );
 288                         }
 289                 }
 290
 291         }
 292
 293         /* Now generate the reply message and send it out. */
 294         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 295         icalcomponent_free(the_reply);  /* don't need this anymore */
 296         if (serialized_reply == NULL) return;
 297
 298         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 299         if (reply_message_text != NULL) {
 300                 sprintf(reply_message_text,
 301                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 302                         serialized_reply
 303                 );
 304
 305                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 306                         CC->quickroom.QRname, 0, FMT_RFC822,
 307                         "",
 308                         summary_string,         /* Use summary for subject */
 309                         reply_message_text);
 310
 311                 if (msg != NULL) {
 312                         valid = validate_recipients(organizer_string);
 313                         CtdlSubmitMsg(msg, valid, "");
 314                         CtdlFreeMessage(msg);
 315                 }
 316         }
 317         phree(serialized_reply);
 318 }
 319
 320
 321
 322 /*
 323  * Callback function for mime parser that hunts for calendar content types
 324  * and turns them into calendar objects
 325  */
 326 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 327                 void *content, char *cbtype, size_t length, char *encoding,
 328                 void *cbuserdata) {
 329
 330         struct ical_respond_data *ird = NULL;
 331
 332         ird = (struct ical_respond_data *) cbuserdata;
 333         if (ird->cal != NULL) {
 334                 icalcomponent_free(ird->cal);
 335                 ird->cal = NULL;
 336         }
 337         if (strcasecmp(partnum, ird->desired_partnum)) return;
 338         ird->cal = icalcomponent_new_from_string(content);
 339         if (ird->cal != NULL) {
 340                 ical_dezonify(ird->cal);
 341         }
 342 }
 343
 344
 345 /*
 346  * Respond to a meeting request.
 347  */
 348 void ical_respond(long msgnum, char *partnum, char *action) {
 349         struct CtdlMessage *msg;
 350         struct ical_respond_data ird;
 351
 352         if (
 353            (strcasecmp(action, "accept"))
 354            && (strcasecmp(action, "decline"))
 355         ) {
 356                 cprintf("%d Action must be 'accept' or 'decline'\n",
 357                         ERROR + ILLEGAL_VALUE
 358                 );
 359                 return;
 360         }
 361
 362         msg = CtdlFetchMessage(msgnum);
 363         if (msg == NULL) {
 364                 cprintf("%d Message %ld not found.\n",
 365                         ERROR+ILLEGAL_VALUE,
 366                         (long)msgnum
 367                 );
 368                 return;
 369         }
 370
 371         memset(&ird, 0, sizeof ird);
 372         strcpy(ird.desired_partnum, partnum);
 373         mime_parser(msg->cm_fields['M'],
 374                 NULL,
 375                 *ical_locate_part,              /* callback function */
 376                 NULL, NULL,
 377                 (void *) &ird,                  /* user data */
 378                 0
 379         );
 380
 381         /* We're done with the incoming message, because we now have a
 382          * calendar object in memory.
 383          */
 384         CtdlFreeMessage(msg);
 385
 386         /*
 387          * Here is the real meat of this function.  Handle the event.
 388          */
 389         if (ird.cal != NULL) {
 390                 /* Save this in the user's calendar if necessary */
 391                 if (!strcasecmp(action, "accept")) {
 392                         ical_add(ird.cal, 0);
 393                 }
 394
 395                 /* Send a reply if necessary */
 396                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 397                         ical_send_a_reply(ird.cal, action);
 398                 }
 399
 400                 /* Now that we've processed this message, we don't need it
 401                  * anymore.  So delete it.
 402                  */
 403                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 404
 405                 /* Free the memory we allocated and return a response. */
 406                 icalcomponent_free(ird.cal);
 407                 ird.cal = NULL;
 408                 cprintf("%d ok\n", CIT_OK);
 409                 return;
 410         }
 411         else {
 412                 cprintf("%d No calendar object found\n", ERROR);
 413                 return;
 414         }
 415
 416         /* should never get here */
 417 }
 418
 419
 420 /*
 421  * Figure out the UID of the calendar event being referred to in a
 422  * REPLY object.  This function is recursive.
 423  */
 424 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 425         icalcomponent *subcomponent;
 426         icalproperty *p;
 427
 428         /* If this object is a REPLY, then extract the UID. */
 429         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 430                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 431                 if (p != NULL) {
 432                         strcpy(uidbuf, icalproperty_get_comment(p));
 433                 }
 434         }
 435
 436         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 437          * UID of the reply; we want the UID of the invitation being replied to.
 438          */
 439         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 440             subcomponent != NULL;
 441             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 442                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 443         }
 444 }
 445
 446
 447 /*
 448  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 449  * locate the message containing the calendar event we're replying to, this function
 450  * gets called.  It basically just sticks the message number in a supplied buffer.
 451  */
 452 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 453         long *msgnumptr;
 454
 455         msgnumptr = (long *) data;
 456         *msgnumptr = msgnum;
 457 }
 458
 459
 460 struct original_event_container {
 461         icalcomponent *c;
 462 };
 463
 464 /*
 465  * Callback function for mime parser that hunts for calendar content types
 466  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 467  * to fetch the object being updated)
 468  */
 469 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 470                 void *content, char *cbtype, size_t length, char *encoding,
 471                 void *cbuserdata) {
 472
 473         struct original_event_container *oec = NULL;
 474
 475         if (strcasecmp(cbtype, "text/calendar")) {
 476                 return;
 477         }
 478         oec = (struct original_event_container *) cbuserdata;
 479         if (oec->c != NULL) {
 480                 icalcomponent_free(oec->c);
 481         }
 482         oec->c = icalcomponent_new_from_string(content);
 483 }
 484
 485
 486 /*
 487  * Merge updated attendee information from a REPLY into an existing event.
 488  */
 489 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 490         icalcomponent *c;
 491         icalproperty *e_attendee, *r_attendee;
 492
 493         /* First things first.  If we're not looking at a VEVENT component,
 494          * recurse through subcomponents until we find one.
 495          */
 496         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 497                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 498                     c != NULL;
 499                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 500                         ical_merge_attendee_reply(c, reply);
 501                 }
 502                 return;
 503         }
 504
 505         /* Now do the same thing with the reply.
 506          */
 507         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 508                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 509                     c != NULL;
 510                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 511                         ical_merge_attendee_reply(event, c);
 512                 }
 513                 return;
 514         }
 515
 516         /* Clone the reply, because we're going to rip its guts out. */
 517         reply = icalcomponent_new_clone(reply);
 518
 519         /* At this point we're looking at the correct subcomponents.
 520          * Iterate through the attendees looking for a match.
 521          */
 522 STARTOVER:
 523         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 524             e_attendee != NULL;
 525             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 526
 527                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 528                     r_attendee != NULL;
 529                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 530
 531                         /* Check to see if these two attendees match...
 532                          */
 533                         if (!strcasecmp(
 534                            icalproperty_get_attendee(e_attendee),
 535                            icalproperty_get_attendee(r_attendee)
 536                         )) {
 537                                 /* ...and if they do, remove the attendee from the event
 538                                  * and replace it with the attendee from the reply.  (The
 539                                  * reply's copy will have the same address, but an updated
 540                                  * status.)
 541                                  */
 542                                 TRACE;
 543                                 icalcomponent_remove_property(event, e_attendee);
 544                                 TRACE;
 545                                 icalproperty_free(e_attendee);
 546                                 TRACE;
 547                                 icalcomponent_remove_property(reply, r_attendee);
 548                                 TRACE;
 549                                 icalcomponent_add_property(event, r_attendee);
 550                                 TRACE;
 551
 552                                 /* Since we diddled both sets of attendees, we have to start
 553                                  * the iteration over again.  This will not create an infinite
 554                                  * loop because we removed the attendee from the reply.  (That's
 555                                  * why we cloned the reply, and that's what we mean by "ripping
 556                                  * its guts out.")
 557                                  */
 558                                 goto STARTOVER;
 559                         }
 560
 561                 }
 562         }
 563
 564         /* Free the *clone* of the reply. */
 565         icalcomponent_free(reply);
 566 }
 567
 568
 569
 570
 571 /*
 572  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 573  * calendar event.  The object has already been deserialized for us; all
 574  * we have to do here is hunt for the event in our calendar, merge in the
 575  * updated attendee status, and save it again.
 576  *
 577  * This function returns 0 on success, 1 if the event was not found in the
 578  * user's calendar, or 2 if an internal error occurred.
 579  */
 580 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 581         char uid[SIZ];
 582         char hold_rm[ROOMNAMELEN];
 583         long msgnum_being_replaced = 0;
 584         struct CtdlMessage *template = NULL;
 585         struct CtdlMessage *msg;
 586         struct original_event_container oec;
 587         icalcomponent *original_event;
 588         char *serialized_event = NULL;
 589         char roomname[ROOMNAMELEN];
 590         char *message_text = NULL;
 591
 592         /* Figure out just what event it is we're dealing with */
 593         strcpy(uid, "--==<< InVaLiD uId >>==--");
 594         ical_learn_uid_of_reply(uid, cal);
 595         lprintf(9, "UID of event being replied to is <%s>\n", uid);
 596
 597         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 598
 599         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 600                 getroom(&CC->quickroom, hold_rm);
 601                 lprintf(3, "cannot get user calendar room\n");
 602                 return(2);
 603         }
 604
 605         /*
 606          * Pound through the user's calendar looking for a message with
 607          * the Citadel EUID set to the value we're looking for.  Since
 608          * Citadel always sets the message EUID to the vCalendar UID of
 609          * the event, this will work.
 610          */
 611         template = (struct CtdlMessage *)
 612                 mallok(sizeof(struct CtdlMessage));
 613         memset(template, 0, sizeof(struct CtdlMessage));
 614         template->cm_fields['E'] = strdoop(uid);
 615         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 616                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 617         CtdlFreeMessage(template);
 618         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 619
 620         lprintf(9, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 621         if (msgnum_being_replaced == 0) {
 622                 return(1);                      /* no calendar event found */
 623         }
 624
 625         /* Now we know the ID of the message containing the event being updated.
 626          * We don't actually have to delete it; that'll get taken care of by the
 627          * server when we save another event with the same UID.  This just gives
 628          * us the ability to load the event into memory so we can diddle the
 629          * attendees.
 630          */
 631         msg = CtdlFetchMessage(msgnum_being_replaced);
 632         if (msg == NULL) {
 633                 return(2);                      /* internal error */
 634         }
 635         oec.c = NULL;
 636         mime_parser(msg->cm_fields['M'],
 637                 NULL,
 638                 *ical_locate_original_event,    /* callback function */
 639                 NULL, NULL,
 640                 &oec,                           /* user data */
 641                 0
 642         );
 643         CtdlFreeMessage(msg);
 644
 645         original_event = oec.c;
 646         if (original_event == NULL) {
 647                 lprintf(3, "ERROR: Original_component is NULL.\n");
 648                 return(2);
 649         }
 650
 651         /* Merge the attendee's updated status into the event */
 652         ical_merge_attendee_reply(original_event, cal);
 653
 654         /* Serialize it */
 655         serialized_event = strdoop(icalcomponent_as_ical_string(original_event));
 656         icalcomponent_free(original_event);     /* Don't need this anymore. */
 657         if (serialized_event == NULL) return(2);
 658
 659         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
 660
 661         message_text = mallok(strlen(serialized_event) + SIZ);
 662         if (message_text != NULL) {
 663                 sprintf(message_text,
 664                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 665                         serialized_event
 666                 );
 667
 668                 msg = CtdlMakeMessage(&CC->usersupp,
 669                         "",                     /* No recipient */
 670                         roomname,
 671                         0, FMT_RFC822,
 672                         "",
 673                         "",             /* no subject */
 674                         message_text);
 675
 676                 if (msg != NULL) {
 677                         CIT_ICAL->avoid_sending_invitations = 1;
 678                         CtdlSubmitMsg(msg, NULL, roomname);
 679                         CtdlFreeMessage(msg);
 680                         CIT_ICAL->avoid_sending_invitations = 0;
 681                 }
 682         }
 683         phree(serialized_event);
 684         return(0);
 685 }
 686
 687
 688 /*
 689  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 690  * simply extracts the calendar object from the message, deserializes it, and
 691  * passes it up to ical_update_my_calendar_with_reply() for processing.
 692  */
 693 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 694         struct CtdlMessage *msg;
 695         struct ical_respond_data ird;
 696         int ret;
 697
 698         if (
 699            (strcasecmp(action, "update"))
 700            && (strcasecmp(action, "ignore"))
 701         ) {
 702                 cprintf("%d Action must be 'update' or 'ignore'\n",
 703                         ERROR + ILLEGAL_VALUE
 704                 );
 705                 return;
 706         }
 707
 708         msg = CtdlFetchMessage(msgnum);
 709         if (msg == NULL) {
 710                 cprintf("%d Message %ld not found.\n",
 711                         ERROR+ILLEGAL_VALUE,
 712                         (long)msgnum
 713                 );
 714                 return;
 715         }
 716
 717         memset(&ird, 0, sizeof ird);
 718         strcpy(ird.desired_partnum, partnum);
 719         mime_parser(msg->cm_fields['M'],
 720                 NULL,
 721                 *ical_locate_part,              /* callback function */
 722                 NULL, NULL,
 723                 (void *) &ird,                  /* user data */
 724                 0
 725         );
 726
 727         /* We're done with the incoming message, because we now have a
 728          * calendar object in memory.
 729          */
 730         CtdlFreeMessage(msg);
 731
 732         /*
 733          * Here is the real meat of this function.  Handle the event.
 734          */
 735         if (ird.cal != NULL) {
 736                 /* Update the user's calendar if necessary */
 737                 if (!strcasecmp(action, "update")) {
 738                         ret = ical_update_my_calendar_with_reply(ird.cal);
 739                         if (ret == 0) {
 740                                 cprintf("%d Your calendar has been updated with this reply.\n",
 741                                         CIT_OK);
 742                         }
 743                         else if (ret == 1) {
 744                                 cprintf("%d This event does not exist in your calendar.\n",
 745                                         ERROR + FILE_NOT_FOUND);
 746                         }
 747                         else {
 748                                 cprintf("%d An internal error occurred.\n",
 749                                         ERROR + INTERNAL_ERROR);
 750                         }
 751                 }
 752                 else {
 753                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 754                 }
 755
 756                 /* Now that we've processed this message, we don't need it
 757                  * anymore.  So delete it.  FIXME uncomment this when ready!
 758                  */
 759                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 760
 761                 /* Free the memory we allocated and return a response. */
 762                 icalcomponent_free(ird.cal);
 763                 ird.cal = NULL;
 764                 return;
 765         }
 766         else {
 767                 cprintf("%d No calendar object found\n", ERROR);
 768                 return;
 769         }
 770
 771         /* should never get here */
 772 }
 773
 774
 775 /*
 776  * Search for a property in both the top level and in a VEVENT subcomponent
 777  */
 778 icalproperty *ical_ctdl_get_subprop(
 779                 icalcomponent *cal,
 780                 icalproperty_kind which_prop
 781 ) {
 782         icalproperty *p;
 783         icalcomponent *c;
 784
 785         p = icalcomponent_get_first_property(cal, which_prop);
 786         if (p == NULL) {
 787                 c = icalcomponent_get_first_component(cal,
 788                                                         ICAL_VEVENT_COMPONENT);
 789                 if (c != NULL) {
 790                         p = icalcomponent_get_first_property(c, which_prop);
 791                 }
 792         }
 793         return p;
 794 }
 795
 796
 797 /*
 798  * Check to see if two events overlap.  Returns nonzero if they do.
 799  */
 800 int ical_ctdl_is_overlap(
 801                         struct icaltimetype t1start,
 802                         struct icaltimetype t1end,
 803                         struct icaltimetype t2start,
 804                         struct icaltimetype t2end
 805 ) {
 806
 807         if (icaltime_is_null_time(t1start)) return(0);
 808         if (icaltime_is_null_time(t2start)) return(0);
 809
 810         /* First, check for all-day events */
 811         if (t1start.is_date) {
 812                 if (!icaltime_compare_date_only(t1start, t2start)) {
 813                         return(1);
 814                 }
 815                 if (!icaltime_is_null_time(t2end)) {
 816                         if (!icaltime_compare_date_only(t1start, t2end)) {
 817                                 return(1);
 818                         }
 819                 }
 820         }
 821
 822         if (t2start.is_date) {
 823                 if (!icaltime_compare_date_only(t2start, t1start)) {
 824                         return(1);
 825                 }
 826                 if (!icaltime_is_null_time(t1end)) {
 827                         if (!icaltime_compare_date_only(t2start, t1end)) {
 828                                 return(1);
 829                         }
 830                 }
 831         }
 832
 833         /* Now check for overlaps using date *and* time. */
 834
 835         /* First, bail out if either event 1 or event 2 is missing end time. */
 836         if (icaltime_is_null_time(t1end)) return(0);
 837         if (icaltime_is_null_time(t2end)) return(0);
 838
 839         /* If event 1 ends before event 2 starts, we're in the clear. */
 840         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 841
 842         /* If event 2 ends before event 1 starts, we're also ok. */
 843         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 844
 845         /* Otherwise, they overlap. */
 846         return(1);
 847 }
 848
 849
 850
 851 /*
 852  * Backend for ical_hunt_for_conflicts()
 853  */
 854 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 855         icalcomponent *cal;
 856         struct CtdlMessage *msg;
 857         struct ical_respond_data ird;
 858         struct icaltimetype t1start, t1end, t2start, t2end;
 859         icalproperty *p;
 860         char conflict_event_uid[SIZ];
 861         char conflict_event_summary[SIZ];
 862         char compare_uid[SIZ];
 863
 864         cal = (icalcomponent *)data;
 865         strcpy(compare_uid, "");
 866         strcpy(conflict_event_uid, "");
 867         strcpy(conflict_event_summary, "");
 868
 869         msg = CtdlFetchMessage(msgnum);
 870         if (msg == NULL) return;
 871         memset(&ird, 0, sizeof ird);
 872         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 873         mime_parser(msg->cm_fields['M'],
 874                 NULL,
 875                 *ical_locate_part,              /* callback function */
 876                 NULL, NULL,
 877                 (void *) &ird,                  /* user data */
 878                 0
 879         );
 880         CtdlFreeMessage(msg);
 881
 882         if (ird.cal == NULL) return;
 883
 884         t1start = icaltime_null_time();
 885         t1end = icaltime_null_time();
 886         t2start = icaltime_null_time();
 887         t1end = icaltime_null_time();
 888
 889         /* Now compare cal to ird.cal */
 890         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 891         if (p == NULL) return;
 892         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 893
 894         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 895         if (p != NULL) t2end = icalproperty_get_dtend(p);
 896
 897         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 898         if (p == NULL) return;
 899         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 900
 901         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 902         if (p != NULL) t1end = icalproperty_get_dtend(p);
 903
 904         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 905         if (p != NULL) {
 906                 strcpy(compare_uid, icalproperty_get_comment(p));
 907         }
 908
 909         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 910         if (p != NULL) {
 911                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 912         }
 913
 914         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 915         if (p != NULL) {
 916                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 917         }
 918
 919
 920         icalcomponent_free(ird.cal);
 921
 922         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 923                 cprintf("%ld||%s|%s|%d|\n",
 924                         msgnum,
 925                         conflict_event_uid,
 926                         conflict_event_summary,
 927                         (       ((strlen(compare_uid)>0)
 928                                 &&(!strcasecmp(compare_uid,
 929                                 conflict_event_uid))) ? 1 : 0
 930                         )
 931                 );
 932         }
 933 }
 934
 935
 936
 937 /*
 938  * Phase 2 of "hunt for conflicts" operation.
 939  * At this point we have a calendar object which represents the VEVENT that
 940  * we're considering adding to the calendar.  Now hunt through the user's
 941  * calendar room, and output zero or more existing VEVENTs which conflict
 942  * with this one.
 943  */
 944 void ical_hunt_for_conflicts(icalcomponent *cal) {
 945         char hold_rm[ROOMNAMELEN];
 946
 947         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 948
 949         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 950                 getroom(&CC->quickroom, hold_rm);
 951                 cprintf("%d You do not have a calendar.\n", ERROR);
 952                 return;
 953         }
 954
 955         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 956
 957         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 958                 NULL,
 959                 ical_hunt_for_conflicts_backend,
 960                 (void *) cal
 961         );
 962
 963         cprintf("000\n");
 964         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 965
 966 }
 967
 968
 969
 970 /*
 971  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 972  */
 973 void ical_conflicts(long msgnum, char *partnum) {
 974         struct CtdlMessage *msg;
 975         struct ical_respond_data ird;
 976
 977         msg = CtdlFetchMessage(msgnum);
 978         if (msg == NULL) {
 979                 cprintf("%d Message %ld not found.\n",
 980                         ERROR+ILLEGAL_VALUE,
 981                         (long)msgnum
 982                 );
 983                 return;
 984         }
 985
 986         memset(&ird, 0, sizeof ird);
 987         strcpy(ird.desired_partnum, partnum);
 988         mime_parser(msg->cm_fields['M'],
 989                 NULL,
 990                 *ical_locate_part,              /* callback function */
 991                 NULL, NULL,
 992                 (void *) &ird,                  /* user data */
 993                 0
 994         );
 995
 996         CtdlFreeMessage(msg);
 997
 998         if (ird.cal != NULL) {
 999                 ical_hunt_for_conflicts(ird.cal);
1000                 icalcomponent_free(ird.cal);
1001                 return;
1002         }
1003         else {
1004                 cprintf("%d No calendar object found\n", ERROR);
1005                 return;
1006         }
1007
1008         /* should never get here */
1009 }
1010
1011
1012
1013 /*
1014  * Remove all properties from a VEVENT that are not supplying the
1015  * bare minimum for free/busy data.
1016  */
1017 void ical_freebusy_strip(icalcomponent *cal) {
1018
1019         icalproperty *p;
1020         int did_something = 1;
1021
1022         if (cal == NULL) return;
1023
1024         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1025                 ical_freebusy_strip(
1026                         icalcomponent_get_first_component(
1027                                 cal, ICAL_VEVENT_COMPONENT
1028                         )
1029                 );
1030                 return;
1031         }
1032
1033         ical_dezonify(cal);
1034
1035         while (did_something) {
1036                 did_something = 0;
1037                 for (   p=icalcomponent_get_first_property
1038                                 (cal, ICAL_ANY_PROPERTY);
1039                         p != NULL;
1040                         p = icalcomponent_get_next_property
1041                                 (cal, ICAL_ANY_PROPERTY)
1042                 ) {
1043
1044                         if (
1045                                 (icalproperty_isa(p)==ICAL_DTSTART_PROPERTY)
1046                            ||   (icalproperty_isa(p)==ICAL_DTEND_PROPERTY)
1047                            ||   (icalproperty_isa(p)==ICAL_DURATION_PROPERTY)
1048                            ||   (icalproperty_isa(p)==ICAL_FREEBUSY_PROPERTY)
1049                            ||   (icalproperty_isa(p)==ICAL_TRANSP_PROPERTY)
1050                            ) {
1051                                 /* keep it */
1052                         }
1053                         else {
1054                                 /* delete it */
1055                                 icalcomponent_remove_property(cal, p);
1056                                 icalproperty_free(p);
1057                                 did_something = 1;
1058                         }
1059
1060                 }
1061         }
1062
1063 }
1064
1065
1066
1067 /*
1068  * Backend for ical_freebusy()
1069  *
1070  * This function simply loads the messages in the user's calendar room,
1071  * which contain VEVENTs, then strips them of all non-freebusy data, and
1072  * adds them to the supplied VCALENDAR.
1073  *
1074  */
1075 void ical_freebusy_backend(long msgnum, void *data) {
1076         icalcomponent *cal;
1077         struct CtdlMessage *msg;
1078         struct ical_respond_data ird;
1079
1080         cal = (icalcomponent *)data;
1081
1082         msg = CtdlFetchMessage(msgnum);
1083         if (msg == NULL) return;
1084         memset(&ird, 0, sizeof ird);
1085         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
1086         mime_parser(msg->cm_fields['M'],
1087                 NULL,
1088                 *ical_locate_part,              /* callback function */
1089                 NULL, NULL,
1090                 (void *) &ird,                  /* user data */
1091                 0
1092         );
1093         CtdlFreeMessage(msg);
1094
1095         if (ird.cal == NULL) return;
1096
1097         /* Strip it!  Strip it good! */
1098         ical_freebusy_strip(ird.cal);
1099
1100         /* Encapsulate ird.cal inside cal (thereby also transferring
1101          * ownership of the memory it consumes).
1102          */
1103         icalcomponent_add_component(cal, ird.cal);
1104 }
1105
1106
1107
1108 /*
1109  * Grab another user's free/busy times
1110  */
1111 void ical_freebusy(char *who) {
1112         struct usersupp usbuf;
1113         char calendar_room_name[ROOMNAMELEN];
1114         char hold_rm[ROOMNAMELEN];
1115         char *serialized_request = NULL;
1116         icalcomponent *encaps = NULL;
1117
1118         if (getuser(&usbuf, who) != 0) {
1119                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1120                 return;
1121         }
1122
1123         MailboxName(calendar_room_name, sizeof calendar_room_name,
1124                 &usbuf, USERCALENDARROOM);
1125
1126         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
1127
1128         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
1129                 cprintf("%d Cannot open calendar\n", ERROR+ROOM_NOT_FOUND);
1130                 getroom(&CC->quickroom, hold_rm);
1131                 return;
1132         }
1133
1134
1135         /* Create a VCALENDAR in which we will encapsulate all the VEVENTs */
1136         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
1137         if (encaps == NULL) {
1138                 cprintf("%d Internal error: cannot allocate memory.\n",
1139                         ERROR+INTERNAL_ERROR);
1140                 getroom(&CC->quickroom, hold_rm);
1141                 return;
1142         }
1143
1144         /* Set the Product ID */
1145         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1146
1147         /* Set the Version Number */
1148         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1149
1150         /* Set the method to ???? FIXME
1151         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST); */
1152
1153         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
1154                 NULL, ical_freebusy_backend, (void *)encaps
1155         );
1156
1157         /* Serialize it */
1158         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1159         icalcomponent_free(encaps);     /* Don't need this anymore. */
1160
1161         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1162         if (serialized_request != NULL) {
1163                 client_write(serialized_request, strlen(serialized_request));
1164         }
1165         cprintf("\n000\n");
1166
1167         /* Go back to the room from which we came... */
1168         getroom(&CC->quickroom, hold_rm);
1169
1170         cprintf("%d not implemented yet\n", ERROR);
1171 }
1172
1173
1174
1175
1176 /*
1177  * All Citadel calendar commands from the client come through here.
1178  */
1179 void cmd_ical(char *argbuf)
1180 {
1181         char subcmd[SIZ];
1182         long msgnum;
1183         char partnum[SIZ];
1184         char action[SIZ];
1185         char who[SIZ];
1186
1187         if (CtdlAccessCheck(ac_logged_in)) return;
1188
1189         extract(subcmd, argbuf, 0);
1190
1191         if (!strcmp(subcmd, "test")) {
1192                 cprintf("%d This server supports calendaring\n", CIT_OK);
1193                 return;
1194         }
1195
1196         else if (!strcmp(subcmd, "respond")) {
1197                 msgnum = extract_long(argbuf, 1);
1198                 extract(partnum, argbuf, 2);
1199                 extract(action, argbuf, 3);
1200                 ical_respond(msgnum, partnum, action);
1201         }
1202
1203         else if (!strcmp(subcmd, "handle_rsvp")) {
1204                 msgnum = extract_long(argbuf, 1);
1205                 extract(partnum, argbuf, 2);
1206                 extract(action, argbuf, 3);
1207                 ical_handle_rsvp(msgnum, partnum, action);
1208         }
1209
1210         else if (!strcmp(subcmd, "conflicts")) {
1211                 msgnum = extract_long(argbuf, 1);
1212                 extract(partnum, argbuf, 2);
1213                 ical_conflicts(msgnum, partnum);
1214         }
1215
1216         else if (!strcmp(subcmd, "freebusy")) {
1217                 extract(who, argbuf, 1);
1218                 ical_freebusy(who);
1219         }
1220
1221         else {
1222                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
1223                 return;
1224         }
1225
1226         /* should never get here */
1227 }
1228
1229
1230
1231 /*
1232  * We don't know if the calendar room exists so we just create it at login
1233  */
1234 void ical_create_room(void)
1235 {
1236         struct quickroom qr;
1237         struct visit vbuf;
1238
1239         /* Create the calendar room if it doesn't already exist */
1240         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
1241
1242         /* Set expiration policy to manual; otherwise objects will be lost! */
1243         if (lgetroom(&qr, USERCALENDARROOM)) {
1244                 lprintf(3, "Couldn't get the user calendar room!\n");
1245                 return;
1246         }
1247         qr.QRep.expire_mode = EXPIRE_MANUAL;
1248         qr.QRdefaultview = 3;   /* 3 = calendar view */
1249         lputroom(&qr);
1250
1251         /* Set the view to a calendar view */
1252         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1253         vbuf.v_view = 3;        /* 3 = calendar */
1254         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1255
1256         /* Create the tasks list room if it doesn't already exist */
1257         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
1258
1259         /* Set expiration policy to manual; otherwise objects will be lost! */
1260         if (lgetroom(&qr, USERTASKSROOM)) {
1261                 lprintf(3, "Couldn't get the user calendar room!\n");
1262                 return;
1263         }
1264         qr.QRep.expire_mode = EXPIRE_MANUAL;
1265         qr.QRdefaultview = 4;   /* 4 = tasks view */
1266         lputroom(&qr);
1267
1268         /* Set the view to a task list view */
1269         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
1270         vbuf.v_view = 4;        /* 4 = tasks */
1271         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
1272
1273         return;
1274 }
1275
1276
1277 /*
1278  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1279  * finds a VEVENT.
1280  */
1281 void ical_send_out_invitations(icalcomponent *cal) {
1282         icalcomponent *the_request = NULL;
1283         char *serialized_request = NULL;
1284         icalcomponent *encaps = NULL;
1285         char *request_message_text = NULL;
1286         struct CtdlMessage *msg = NULL;
1287         struct recptypes *valid = NULL;
1288         char attendees_string[SIZ];
1289         int num_attendees = 0;
1290         char this_attendee[SIZ];
1291         icalproperty *attendee = NULL;
1292         char summary_string[SIZ];
1293         icalproperty *summary = NULL;
1294
1295         if (cal == NULL) {
1296                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
1297                 return;
1298         }
1299
1300
1301         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1302         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1303                 ical_send_out_invitations(
1304                         icalcomponent_get_first_component(
1305                                 cal, ICAL_VEVENT_COMPONENT
1306                         )
1307                 );
1308                 return;
1309         }
1310
1311         /* Clone the event */
1312         the_request = icalcomponent_new_clone(cal);
1313         if (the_request == NULL) {
1314                 lprintf(3, "ERROR: cannot clone calendar object\n");
1315                 return;
1316         }
1317
1318         /* Extract the summary string -- we'll use it as the
1319          * message subject for the request
1320          */
1321         strcpy(summary_string, "Meeting request");
1322         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1323         if (summary != NULL) {
1324                 if (icalproperty_get_summary(summary)) {
1325                         strcpy(summary_string,
1326                                 icalproperty_get_summary(summary) );
1327                 }
1328         }
1329
1330         /* Determine who the recipients of this message are (the attendees) */
1331         strcpy(attendees_string, "");
1332         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1333                 if (icalproperty_get_attendee(attendee)) {
1334                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1335                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1336                                 strcpy(this_attendee, &this_attendee[7]);
1337                                 snprintf(&attendees_string[strlen(attendees_string)],
1338                                         sizeof(attendees_string) - strlen(attendees_string),
1339                                         "%s, ",
1340                                         this_attendee
1341                                 );
1342                                 ++num_attendees;
1343                         }
1344                 }
1345         }
1346
1347         lprintf(9, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1348
1349         /* If there are no attendees, there are no invitations to send, so...
1350          * don't bother putting one together!  Punch out, Maverick!
1351          */
1352         if (num_attendees == 0) {
1353                 icalcomponent_free(the_request);
1354                 return;
1355         }
1356
1357         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1358         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
1359         if (encaps == NULL) {
1360                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
1361                         __FILE__, __LINE__);
1362                 icalcomponent_free(the_request);
1363                 return;
1364         }
1365
1366         /* Set the Product ID */
1367         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1368
1369         /* Set the Version Number */
1370         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1371
1372         /* Set the method to REQUEST */
1373         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1374
1375         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1376         ical_dezonify(the_request);
1377
1378         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1379          * are responsible for "the_request"'s memory -- it will be freed
1380          * when we free "encaps".
1381          */
1382         icalcomponent_add_component(encaps, the_request);
1383
1384         /* Serialize it */
1385         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1386         icalcomponent_free(encaps);     /* Don't need this anymore. */
1387         if (serialized_request == NULL) return;
1388
1389         request_message_text = mallok(strlen(serialized_request) + SIZ);
1390         if (request_message_text != NULL) {
1391                 sprintf(request_message_text,
1392                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1393                         serialized_request
1394                 );
1395
1396                 msg = CtdlMakeMessage(&CC->usersupp,
1397                         "",                     /* No single recipient here */
1398                         CC->quickroom.QRname, 0, FMT_RFC822,
1399                         "",
1400                         summary_string,         /* Use summary for subject */
1401                         request_message_text);
1402
1403                 if (msg != NULL) {
1404                         valid = validate_recipients(attendees_string);
1405                         CtdlSubmitMsg(msg, valid, "");
1406                         CtdlFreeMessage(msg);
1407                 }
1408         }
1409         phree(serialized_request);
1410 }
1411
1412
1413 /*
1414  * When a calendar object is being saved, determine whether it's a VEVENT
1415  * and the user saving it is the organizer.  If so, send out invitations
1416  * to any listed attendees.
1417  *
1418  */
1419 void ical_saving_vevent(icalcomponent *cal) {
1420         icalcomponent *c;
1421         icalproperty *organizer = NULL;
1422         char organizer_string[SIZ];
1423
1424         /* Don't send out invitations if we've been asked not to. */
1425         lprintf(9, "CIT_ICAL->avoid_sending_invitations = %d\n",
1426                 CIT_ICAL->avoid_sending_invitations);
1427         if (CIT_ICAL->avoid_sending_invitations > 0) {
1428                 return;
1429         }
1430
1431         strcpy(organizer_string, "");
1432         /*
1433          * The VEVENT subcomponent is the one we're interested in.
1434          * Send out invitations if, and only if, this user is the Organizer.
1435          */
1436         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1437                 organizer = icalcomponent_get_first_property(cal,
1438                                                 ICAL_ORGANIZER_PROPERTY);
1439                 if (organizer != NULL) {
1440                         if (icalproperty_get_organizer(organizer)) {
1441                                 strcpy(organizer_string,
1442                                         icalproperty_get_organizer(organizer));
1443                         }
1444                 }
1445                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1446                         strcpy(organizer_string, &organizer_string[7]);
1447                         striplt(organizer_string);
1448                         /*
1449                          * If the user saving the event is listed as the
1450                          * organizer, then send out invitations.
1451                          */
1452                         if (CtdlIsMe(organizer_string)) {
1453                                 ical_send_out_invitations(cal);
1454                         }
1455                 }
1456         }
1457
1458         /* If the component has subcomponents, recurse through them. */
1459         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1460             (c != NULL);
1461             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1462                 /* Recursively process subcomponent */
1463                 ical_saving_vevent(c);
1464         }
1465
1466 }
1467
1468
1469
1470 /*
1471  * Back end for ical_obj_beforesave()
1472  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1473  * the summary of the event (becomes message subject),
1474  * and the start time (becomes message date/time).
1475  */
1476 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1477                 char *disp, void *content, char *cbtype, size_t length,
1478                 char *encoding, void *cbuserdata)
1479 {
1480         icalcomponent *cal;
1481         icalproperty *p;
1482         struct icalmessagemod *imm;
1483
1484         imm = (struct icalmessagemod *)cbuserdata;
1485
1486         /* If this is a text/calendar object, hunt for the UID and drop it in
1487          * the "user data" pointer for the MIME parser.  When
1488          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1489          * to that string.
1490          */
1491         if (!strcasecmp(cbtype, "text/calendar")) {
1492                 cal = icalcomponent_new_from_string(content);
1493                 if (cal != NULL) {
1494                         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1495                                 cal = icalcomponent_get_first_component(
1496                                         cal, ICAL_VEVENT_COMPONENT
1497                                 );
1498                         }
1499                 }
1500                 if (cal != NULL) {
1501                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1502                         if (p != NULL) {
1503                                 strcpy(imm->uid, icalproperty_get_comment(p));
1504                         }
1505                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1506                         if (p != NULL) {
1507                                 strcpy(imm->subject,
1508                                                 icalproperty_get_comment(p));
1509                         }
1510                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1511                         if (p != NULL) {
1512                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1513                         }
1514                         icalcomponent_free(cal);
1515                 }
1516         }
1517 }
1518
1519
1520
1521
1522
1523 /*
1524  * See if we need to prevent the object from being saved (we don't allow
1525  * MIME types other than text/calendar in the Calendar> room).  Also, when
1526  * saving an event to the calendar, set the message's Citadel extended message
1527  * ID to the UID of the object.  This causes our replication checker to
1528  * automatically delete any existing instances of the same object.  (Isn't
1529  * that cool?)
1530  *
1531  * We also set the message's Subject to the event summary, and the Date/time to
1532  * the event start time.
1533  */
1534 int ical_obj_beforesave(struct CtdlMessage *msg)
1535 {
1536         char roomname[ROOMNAMELEN];
1537         char *p;
1538         int a;
1539         struct icalmessagemod imm;
1540
1541         /*
1542          * Only messages with content-type text/calendar
1543          * may be saved to Calendar>.  If the message is bound for
1544          * Calendar> but doesn't have this content-type, throw an error
1545          * so that the message may not be posted.
1546          */
1547
1548         /* First determine if this is our room */
1549         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1550         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1551                 return 0;       /* It's not the Calendar room. */
1552         }
1553
1554         /* Then determine content-type of the message */
1555
1556         /* It must be an RFC822 message! */
1557         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1558         if (msg->cm_format_type != 4)
1559                 return 1;       /* You tried to save a non-RFC822 message! */
1560
1561         /* Find the Content-Type: header */
1562         p = msg->cm_fields['M'];
1563         a = strlen(p);
1564         while (--a > 0) {
1565                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1566                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1567                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1568                                 mime_parser(msg->cm_fields['M'],
1569                                         NULL,
1570                                         *ical_ctdl_set_extended_msgid,
1571                                         NULL, NULL,
1572                                         (void *)&imm,
1573                                         0
1574                                 );
1575                                 if (strlen(imm.uid) > 0) {
1576                                         if (msg->cm_fields['E'] != NULL) {
1577                                                 phree(msg->cm_fields['E']);
1578                                         }
1579                                         msg->cm_fields['E'] = strdoop(imm.uid);
1580                                 }
1581                                 if (strlen(imm.subject) > 0) {
1582                                         if (msg->cm_fields['U'] != NULL) {
1583                                                 phree(msg->cm_fields['U']);
1584                                         }
1585                                         msg->cm_fields['U'] = strdoop(imm.subject);
1586                                 }
1587                                 if (imm.dtstart > 0) {
1588                                         if (msg->cm_fields['T'] != NULL) {
1589                                                 phree(msg->cm_fields['T']);
1590                                         }
1591                                         msg->cm_fields['T'] = strdoop("000000000000000000");
1592                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1593                                 }
1594                                 return 0;
1595                         }
1596                         else {
1597                                 return 1;
1598                         }
1599                 }
1600                 p++;
1601         }
1602
1603         /* Oops!  No Content-Type in this message!  How'd that happen? */
1604         lprintf(7, "RFC822 message with no Content-Type header!\n");
1605         return 1;
1606 }
1607
1608
1609 /*
1610  * Things we need to do after saving a calendar event.
1611  */
1612 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1613                 char *disp, void *content, char *cbtype, size_t length,
1614                 char *encoding, void *cbuserdata)
1615 {
1616         icalcomponent *cal;
1617
1618         /* If this is a text/calendar object, hunt for the UID and drop it in
1619          * the "user data" pointer for the MIME parser.  When
1620          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1621          * to that string.
1622          */
1623         if (!strcasecmp(cbtype, "text/calendar")) {
1624                 cal = icalcomponent_new_from_string(content);
1625                 if (cal != NULL) {
1626                         ical_saving_vevent(cal);
1627                         icalcomponent_free(cal);
1628                 }
1629         }
1630 }
1631
1632
1633 /*
1634  * Things we need to do after saving a calendar event.
1635  */
1636 int ical_obj_aftersave(struct CtdlMessage *msg)
1637 {
1638         char roomname[ROOMNAMELEN];
1639         char *p;
1640         int a;
1641
1642         /*
1643          * If this isn't the Calendar> room, no further action is necessary.
1644          */
1645
1646         /* First determine if this is our room */
1647         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1648         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1649                 return 0;       /* It's not the Calendar room. */
1650         }
1651
1652         /* Then determine content-type of the message */
1653
1654         /* It must be an RFC822 message! */
1655         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1656         if (msg->cm_format_type != 4) return(1);
1657
1658         /* Find the Content-Type: header */
1659         p = msg->cm_fields['M'];
1660         a = strlen(p);
1661         while (--a > 0) {
1662                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1663                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1664                                 mime_parser(msg->cm_fields['M'],
1665                                         NULL,
1666                                         *ical_obj_aftersave_backend,
1667                                         NULL, NULL,
1668                                         NULL,
1669                                         0
1670                                 );
1671                                 return 0;
1672                         }
1673                         else {
1674                                 return 1;
1675                         }
1676                 }
1677                 p++;
1678         }
1679
1680         /* Oops!  No Content-Type in this message!  How'd that happen? */
1681         lprintf(7, "RFC822 message with no Content-Type header!\n");
1682         return 1;
1683 }
1684
1685
1686 void ical_session_startup(void) {
1687         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1688         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1689 }
1690
1691
1692 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
1693
1694 /*
1695  * Register this module with the Citadel server.
1696  */
1697 char *serv_calendar_init(void)
1698 {
1699 #ifdef CITADEL_WITH_CALENDAR_SERVICE
1700         SYM_CIT_ICAL = CtdlGetDynamicSymbol();
1701         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1702         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1703         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1704         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1705         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1706 #endif
1707         return "$Id$";
1708 }