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 create a new VCALENDAR component with some of the
  51  * required fields already set the way we like them.
  52  */
  53 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  54         icalcomponent *encaps;
  55
  56         encaps = icalcomponent_new_vcalendar();
  57         if (encaps == NULL) {
  58                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
  59                         __FILE__, __LINE__);
  60                 return NULL;
  61         }
  62
  63         /* Set the Product ID */
  64         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  65
  66         /* Set the Version Number */
  67         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  68
  69         return(encaps);
  70 }
  71
  72
  73 /*
  74  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  75  */
  76 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  77         icalcomponent *encaps;
  78
  79         /* If we're already looking at a full VCALENDAR component,
  80          * don't bother ... just return itself.
  81          */
  82         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  83                 return subcomp;
  84         }
  85
  86         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  87         encaps = icalcomponent_new_citadel_vcalendar();
  88         if (encaps == NULL) return NULL;
  89
  90         /* Encapsulate the subcomponent inside */
  91         icalcomponent_add_component(encaps, subcomp);
  92
  93         /* Convert all timestamps to UTC so we don't have to deal with
  94          * stupid VTIMEZONE crap.
  95          */
  96         ical_dezonify(encaps);
  97
  98         /* Return the object we just created. */
  99         return(encaps);
 100 }
 101
 102
 103
 104
 105 /*
 106  * Write a calendar object into the specified user's calendar room.
 107  *
 108  * ok
 109  */
 110 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 111         char temp[PATH_MAX];
 112         FILE *fp;
 113         char *ser;
 114         icalcomponent *encaps;
 115
 116         if (cal == NULL) return;
 117
 118         /* If the supplied object is a subcomponent, encapsulate it in
 119          * a full VCALENDAR component, and save that instead.
 120          */
 121         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 122                 encaps = ical_encapsulate_subcomponent(
 123                         icalcomponent_new_clone(cal)
 124                 );
 125                 ical_write_to_cal(u, encaps);
 126                 icalcomponent_free(encaps);
 127                 return;
 128         }
 129
 130         strcpy(temp, tmpnam(NULL));
 131         ser = icalcomponent_as_ical_string(cal);
 132         if (ser == NULL) return;
 133
 134         /* Make a temp file out of it */
 135         fp = fopen(temp, "w");
 136         if (fp == NULL) return;
 137         fwrite(ser, strlen(ser), 1, fp);
 138         fclose(fp);
 139
 140         /* This handy API function does all the work for us.
 141          */
 142         CtdlWriteObject(USERCALENDARROOM,       /* which room */
 143                         "text/calendar",        /* MIME type */
 144                         temp,                   /* temp file */
 145                         u,                      /* which user */
 146                         0,                      /* not binary */
 147                         0,              /* don't delete others of this type */
 148                         0);                     /* no flags */
 149
 150         unlink(temp);
 151 }
 152
 153
 154 /*
 155  * Add a calendar object to the user's calendar
 156  *
 157  * ok because it uses ical_write_to_cal()
 158  */
 159 void ical_add(icalcomponent *cal, int recursion_level) {
 160         icalcomponent *c;
 161
 162         /*
 163          * The VEVENT subcomponent is the one we're interested in saving.
 164          */
 165         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 166
 167                 ical_write_to_cal(&CC->user, cal);
 168
 169         }
 170
 171         /* If the component has subcomponents, recurse through them. */
 172         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 173             (c != 0);
 174             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 175                 /* Recursively process subcomponent */
 176                 ical_add(c, recursion_level+1);
 177         }
 178
 179 }
 180
 181
 182
 183 /*
 184  * Send a reply to a meeting invitation.
 185  *
 186  * 'request' is the invitation to reply to.
 187  * 'action' is the string "accept" or "decline".
 188  *
 189  * (Sorry about this being more than 80 columns ... there was just
 190  * no easy way to break it down sensibly.)
 191  *
 192  * ok
 193  */
 194 void ical_send_a_reply(icalcomponent *request, char *action) {
 195         icalcomponent *the_reply = NULL;
 196         icalcomponent *vevent = NULL;
 197         icalproperty *attendee = NULL;
 198         char attendee_string[SIZ];
 199         icalproperty *organizer = NULL;
 200         char organizer_string[SIZ];
 201         icalproperty *summary = NULL;
 202         char summary_string[SIZ];
 203         icalproperty *me_attend = NULL;
 204         struct recptypes *recp = NULL;
 205         icalparameter *partstat = NULL;
 206         char *serialized_reply = NULL;
 207         char *reply_message_text = NULL;
 208         struct CtdlMessage *msg = NULL;
 209         struct recptypes *valid = NULL;
 210
 211         strcpy(organizer_string, "");
 212         strcpy(summary_string, "Calendar item");
 213
 214         if (request == NULL) {
 215                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 216                 return;
 217         }
 218
 219         the_reply = icalcomponent_new_clone(request);
 220         if (the_reply == NULL) {
 221                 lprintf(3, "ERROR: cannot clone request\n");
 222                 return;
 223         }
 224
 225         /* Change the method from REQUEST to REPLY */
 226         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 227
 228         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 229         if (vevent != NULL) {
 230                 /* Hunt for attendees, removing ones that aren't us.
 231                  * (Actually, remove them all, cloning our own one so we can
 232                  * re-insert it later)
 233                  */
 234                 while (attendee = icalcomponent_get_first_property(vevent,
 235                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 236                 ) {
 237                         if (icalproperty_get_attendee(attendee)) {
 238                                 strcpy(attendee_string,
 239                                         icalproperty_get_attendee(attendee) );
 240                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 241                                         strcpy(attendee_string, &attendee_string[7]);
 242                                         striplt(attendee_string);
 243                                         recp = validate_recipients(attendee_string);
 244                                         if (recp != NULL) {
 245                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 246                                                         if (me_attend) icalproperty_free(me_attend);
 247                                                         me_attend = icalproperty_new_clone(attendee);
 248                                                 }
 249                                                 phree(recp);
 250                                         }
 251                                 }
 252                         }
 253                         /* Remove it... */
 254                         icalcomponent_remove_property(vevent, attendee);
 255                         icalproperty_free(attendee);
 256                 }
 257
 258                 /* We found our own address in the attendee list. */
 259                 if (me_attend) {
 260                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 261                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 262
 263                         if (!strcasecmp(action, "accept")) {
 264                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 265                         }
 266                         else if (!strcasecmp(action, "decline")) {
 267                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 268                         }
 269                         else if (!strcasecmp(action, "tentative")) {
 270                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 271                         }
 272
 273                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 274
 275                         /* Now insert it back into the vevent. */
 276                         icalcomponent_add_property(vevent, me_attend);
 277                 }
 278
 279                 /* Figure out who to send this thing to */
 280                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 281                 if (organizer != NULL) {
 282                         if (icalproperty_get_organizer(organizer)) {
 283                                 strcpy(organizer_string,
 284                                         icalproperty_get_organizer(organizer) );
 285                         }
 286                 }
 287                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 288                         strcpy(organizer_string, &organizer_string[7]);
 289                         striplt(organizer_string);
 290                 } else {
 291                         strcpy(organizer_string, "");
 292                 }
 293
 294                 /* Extract the summary string -- we'll use it as the
 295                  * message subject for the reply
 296                  */
 297                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 298                 if (summary != NULL) {
 299                         if (icalproperty_get_summary(summary)) {
 300                                 strcpy(summary_string,
 301                                         icalproperty_get_summary(summary) );
 302                         }
 303                 }
 304
 305         }
 306
 307         /* Now generate the reply message and send it out. */
 308         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 309         icalcomponent_free(the_reply);  /* don't need this anymore */
 310         if (serialized_reply == NULL) return;
 311
 312         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 313         if (reply_message_text != NULL) {
 314                 sprintf(reply_message_text,
 315                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 316                         serialized_reply
 317                 );
 318
 319                 msg = CtdlMakeMessage(&CC->user, organizer_string,
 320                         CC->room.QRname, 0, FMT_RFC822,
 321                         "",
 322                         summary_string,         /* Use summary for subject */
 323                         reply_message_text);
 324
 325                 if (msg != NULL) {
 326                         valid = validate_recipients(organizer_string);
 327                         CtdlSubmitMsg(msg, valid, "");
 328                         CtdlFreeMessage(msg);
 329                 }
 330         }
 331         phree(serialized_reply);
 332 }
 333
 334
 335
 336 /*
 337  * Callback function for mime parser that hunts for calendar content types
 338  * and turns them into calendar objects
 339  */
 340 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 341                 void *content, char *cbtype, size_t length, char *encoding,
 342                 void *cbuserdata) {
 343
 344         struct ical_respond_data *ird = NULL;
 345
 346         ird = (struct ical_respond_data *) cbuserdata;
 347
 348         /* desired_partnum can be set to "_HUNT_" to have it just look for
 349          * the first part with a content type of text/calendar.  Otherwise
 350          * we have to only process the right one.
 351          */
 352         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 353                 if (strcasecmp(partnum, ird->desired_partnum)) {
 354                         return;
 355                 }
 356         }
 357
 358         if (strcasecmp(cbtype, "text/calendar")) {
 359                 return;
 360         }
 361
 362         if (ird->cal != NULL) {
 363                 icalcomponent_free(ird->cal);
 364                 ird->cal = NULL;
 365         }
 366
 367         ird->cal = icalcomponent_new_from_string(content);
 368         if (ird->cal != NULL) {
 369                 ical_dezonify(ird->cal);
 370         }
 371 }
 372
 373
 374 /*
 375  * Respond to a meeting request.
 376  */
 377 void ical_respond(long msgnum, char *partnum, char *action) {
 378         struct CtdlMessage *msg;
 379         struct ical_respond_data ird;
 380
 381         if (
 382            (strcasecmp(action, "accept"))
 383            && (strcasecmp(action, "decline"))
 384         ) {
 385                 cprintf("%d Action must be 'accept' or 'decline'\n",
 386                         ERROR + ILLEGAL_VALUE
 387                 );
 388                 return;
 389         }
 390
 391         msg = CtdlFetchMessage(msgnum);
 392         if (msg == NULL) {
 393                 cprintf("%d Message %ld not found.\n",
 394                         ERROR+ILLEGAL_VALUE,
 395                         (long)msgnum
 396                 );
 397                 return;
 398         }
 399
 400         memset(&ird, 0, sizeof ird);
 401         strcpy(ird.desired_partnum, partnum);
 402         mime_parser(msg->cm_fields['M'],
 403                 NULL,
 404                 *ical_locate_part,              /* callback function */
 405                 NULL, NULL,
 406                 (void *) &ird,                  /* user data */
 407                 0
 408         );
 409
 410         /* We're done with the incoming message, because we now have a
 411          * calendar object in memory.
 412          */
 413         CtdlFreeMessage(msg);
 414
 415         /*
 416          * Here is the real meat of this function.  Handle the event.
 417          */
 418         if (ird.cal != NULL) {
 419                 /* Save this in the user's calendar if necessary */
 420                 if (!strcasecmp(action, "accept")) {
 421                         ical_add(ird.cal, 0);
 422                 }
 423
 424                 /* Send a reply if necessary */
 425                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 426                         ical_send_a_reply(ird.cal, action);
 427                 }
 428
 429                 /* Now that we've processed this message, we don't need it
 430                  * anymore.  So delete it.
 431                  */
 432                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 433
 434                 /* Free the memory we allocated and return a response. */
 435                 icalcomponent_free(ird.cal);
 436                 ird.cal = NULL;
 437                 cprintf("%d ok\n", CIT_OK);
 438                 return;
 439         }
 440         else {
 441                 cprintf("%d No calendar object found\n", ERROR);
 442                 return;
 443         }
 444
 445         /* should never get here */
 446 }
 447
 448
 449 /*
 450  * Figure out the UID of the calendar event being referred to in a
 451  * REPLY object.  This function is recursive.
 452  */
 453 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 454         icalcomponent *subcomponent;
 455         icalproperty *p;
 456
 457         /* If this object is a REPLY, then extract the UID. */
 458         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 459                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 460                 if (p != NULL) {
 461                         strcpy(uidbuf, icalproperty_get_comment(p));
 462                 }
 463         }
 464
 465         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 466          * UID of the reply; we want the UID of the invitation being replied to.
 467          */
 468         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 469             subcomponent != NULL;
 470             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 471                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 472         }
 473 }
 474
 475
 476 /*
 477  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 478  * locate the message containing the calendar event we're replying to, this function
 479  * gets called.  It basically just sticks the message number in a supplied buffer.
 480  */
 481 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 482         long *msgnumptr;
 483
 484         msgnumptr = (long *) data;
 485         *msgnumptr = msgnum;
 486 }
 487
 488
 489 struct original_event_container {
 490         icalcomponent *c;
 491 };
 492
 493 /*
 494  * Callback function for mime parser that hunts for calendar content types
 495  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 496  * to fetch the object being updated)
 497  */
 498 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 499                 void *content, char *cbtype, size_t length, char *encoding,
 500                 void *cbuserdata) {
 501
 502         struct original_event_container *oec = NULL;
 503
 504         if (strcasecmp(cbtype, "text/calendar")) {
 505                 return;
 506         }
 507         oec = (struct original_event_container *) cbuserdata;
 508         if (oec->c != NULL) {
 509                 icalcomponent_free(oec->c);
 510         }
 511         oec->c = icalcomponent_new_from_string(content);
 512 }
 513
 514
 515 /*
 516  * Merge updated attendee information from a REPLY into an existing event.
 517  */
 518 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 519         icalcomponent *c;
 520         icalproperty *e_attendee, *r_attendee;
 521
 522         /* First things first.  If we're not looking at a VEVENT component,
 523          * recurse through subcomponents until we find one.
 524          */
 525         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 526                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 527                     c != NULL;
 528                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 529                         ical_merge_attendee_reply(c, reply);
 530                 }
 531                 return;
 532         }
 533
 534         /* Now do the same thing with the reply.
 535          */
 536         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 537                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 538                     c != NULL;
 539                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 540                         ical_merge_attendee_reply(event, c);
 541                 }
 542                 return;
 543         }
 544
 545         /* Clone the reply, because we're going to rip its guts out. */
 546         reply = icalcomponent_new_clone(reply);
 547
 548         /* At this point we're looking at the correct subcomponents.
 549          * Iterate through the attendees looking for a match.
 550          */
 551 STARTOVER:
 552         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 553             e_attendee != NULL;
 554             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 555
 556                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 557                     r_attendee != NULL;
 558                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 559
 560                         /* Check to see if these two attendees match...
 561                          */
 562                         if (!strcasecmp(
 563                            icalproperty_get_attendee(e_attendee),
 564                            icalproperty_get_attendee(r_attendee)
 565                         )) {
 566                                 /* ...and if they do, remove the attendee from the event
 567                                  * and replace it with the attendee from the reply.  (The
 568                                  * reply's copy will have the same address, but an updated
 569                                  * status.)
 570                                  */
 571                                 TRACE;
 572                                 icalcomponent_remove_property(event, e_attendee);
 573                                 TRACE;
 574                                 icalproperty_free(e_attendee);
 575                                 TRACE;
 576                                 icalcomponent_remove_property(reply, r_attendee);
 577                                 TRACE;
 578                                 icalcomponent_add_property(event, r_attendee);
 579                                 TRACE;
 580
 581                                 /* Since we diddled both sets of attendees, we have to start
 582                                  * the iteration over again.  This will not create an infinite
 583                                  * loop because we removed the attendee from the reply.  (That's
 584                                  * why we cloned the reply, and that's what we mean by "ripping
 585                                  * its guts out.")
 586                                  */
 587                                 goto STARTOVER;
 588                         }
 589
 590                 }
 591         }
 592
 593         /* Free the *clone* of the reply. */
 594         icalcomponent_free(reply);
 595 }
 596
 597
 598
 599
 600 /*
 601  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 602  * calendar event.  The object has already been deserialized for us; all
 603  * we have to do here is hunt for the event in our calendar, merge in the
 604  * updated attendee status, and save it again.
 605  *
 606  * This function returns 0 on success, 1 if the event was not found in the
 607  * user's calendar, or 2 if an internal error occurred.
 608  */
 609 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 610         char uid[SIZ];
 611         char hold_rm[ROOMNAMELEN];
 612         long msgnum_being_replaced = 0;
 613         struct CtdlMessage *template = NULL;
 614         struct CtdlMessage *msg;
 615         struct original_event_container oec;
 616         icalcomponent *original_event;
 617         char *serialized_event = NULL;
 618         char roomname[ROOMNAMELEN];
 619         char *message_text = NULL;
 620
 621         /* Figure out just what event it is we're dealing with */
 622         strcpy(uid, "--==<< InVaLiD uId >>==--");
 623         ical_learn_uid_of_reply(uid, cal);
 624         lprintf(9, "UID of event being replied to is <%s>\n", uid);
 625
 626         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 627
 628         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 629                 getroom(&CC->room, hold_rm);
 630                 lprintf(3, "cannot get user calendar room\n");
 631                 return(2);
 632         }
 633
 634         /*
 635          * Pound through the user's calendar looking for a message with
 636          * the Citadel EUID set to the value we're looking for.  Since
 637          * Citadel always sets the message EUID to the vCalendar UID of
 638          * the event, this will work.
 639          */
 640         template = (struct CtdlMessage *)
 641                 mallok(sizeof(struct CtdlMessage));
 642         memset(template, 0, sizeof(struct CtdlMessage));
 643         template->cm_fields['E'] = strdoop(uid);
 644         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 645                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 646         CtdlFreeMessage(template);
 647         getroom(&CC->room, hold_rm);    /* return to saved room */
 648
 649         lprintf(9, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 650         if (msgnum_being_replaced == 0) {
 651                 return(1);                      /* no calendar event found */
 652         }
 653
 654         /* Now we know the ID of the message containing the event being updated.
 655          * We don't actually have to delete it; that'll get taken care of by the
 656          * server when we save another event with the same UID.  This just gives
 657          * us the ability to load the event into memory so we can diddle the
 658          * attendees.
 659          */
 660         msg = CtdlFetchMessage(msgnum_being_replaced);
 661         if (msg == NULL) {
 662                 return(2);                      /* internal error */
 663         }
 664         oec.c = NULL;
 665         mime_parser(msg->cm_fields['M'],
 666                 NULL,
 667                 *ical_locate_original_event,    /* callback function */
 668                 NULL, NULL,
 669                 &oec,                           /* user data */
 670                 0
 671         );
 672         CtdlFreeMessage(msg);
 673
 674         original_event = oec.c;
 675         if (original_event == NULL) {
 676                 lprintf(3, "ERROR: Original_component is NULL.\n");
 677                 return(2);
 678         }
 679
 680         /* Merge the attendee's updated status into the event */
 681         ical_merge_attendee_reply(original_event, cal);
 682
 683         /* Serialize it */
 684         serialized_event = strdoop(icalcomponent_as_ical_string(original_event));
 685         icalcomponent_free(original_event);     /* Don't need this anymore. */
 686         if (serialized_event == NULL) return(2);
 687
 688         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 689
 690         message_text = mallok(strlen(serialized_event) + SIZ);
 691         if (message_text != NULL) {
 692                 sprintf(message_text,
 693                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 694                         serialized_event
 695                 );
 696
 697                 msg = CtdlMakeMessage(&CC->user,
 698                         "",                     /* No recipient */
 699                         roomname,
 700                         0, FMT_RFC822,
 701                         "",
 702                         "",             /* no subject */
 703                         message_text);
 704
 705                 if (msg != NULL) {
 706                         CIT_ICAL->avoid_sending_invitations = 1;
 707                         CtdlSubmitMsg(msg, NULL, roomname);
 708                         CtdlFreeMessage(msg);
 709                         CIT_ICAL->avoid_sending_invitations = 0;
 710                 }
 711         }
 712         phree(serialized_event);
 713         return(0);
 714 }
 715
 716
 717 /*
 718  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 719  * simply extracts the calendar object from the message, deserializes it, and
 720  * passes it up to ical_update_my_calendar_with_reply() for processing.
 721  */
 722 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 723         struct CtdlMessage *msg;
 724         struct ical_respond_data ird;
 725         int ret;
 726
 727         if (
 728            (strcasecmp(action, "update"))
 729            && (strcasecmp(action, "ignore"))
 730         ) {
 731                 cprintf("%d Action must be 'update' or 'ignore'\n",
 732                         ERROR + ILLEGAL_VALUE
 733                 );
 734                 return;
 735         }
 736
 737         msg = CtdlFetchMessage(msgnum);
 738         if (msg == NULL) {
 739                 cprintf("%d Message %ld not found.\n",
 740                         ERROR+ILLEGAL_VALUE,
 741                         (long)msgnum
 742                 );
 743                 return;
 744         }
 745
 746         memset(&ird, 0, sizeof ird);
 747         strcpy(ird.desired_partnum, partnum);
 748         mime_parser(msg->cm_fields['M'],
 749                 NULL,
 750                 *ical_locate_part,              /* callback function */
 751                 NULL, NULL,
 752                 (void *) &ird,                  /* user data */
 753                 0
 754         );
 755
 756         /* We're done with the incoming message, because we now have a
 757          * calendar object in memory.
 758          */
 759         CtdlFreeMessage(msg);
 760
 761         /*
 762          * Here is the real meat of this function.  Handle the event.
 763          */
 764         if (ird.cal != NULL) {
 765                 /* Update the user's calendar if necessary */
 766                 if (!strcasecmp(action, "update")) {
 767                         ret = ical_update_my_calendar_with_reply(ird.cal);
 768                         if (ret == 0) {
 769                                 cprintf("%d Your calendar has been updated with this reply.\n",
 770                                         CIT_OK);
 771                         }
 772                         else if (ret == 1) {
 773                                 cprintf("%d This event does not exist in your calendar.\n",
 774                                         ERROR + FILE_NOT_FOUND);
 775                         }
 776                         else {
 777                                 cprintf("%d An internal error occurred.\n",
 778                                         ERROR + INTERNAL_ERROR);
 779                         }
 780                 }
 781                 else {
 782                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 783                 }
 784
 785                 /* Now that we've processed this message, we don't need it
 786                  * anymore.  So delete it.  (Maybe make this optional?)
 787                  */
 788                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 789
 790                 /* Free the memory we allocated and return a response. */
 791                 icalcomponent_free(ird.cal);
 792                 ird.cal = NULL;
 793                 return;
 794         }
 795         else {
 796                 cprintf("%d No calendar object found\n", ERROR);
 797                 return;
 798         }
 799
 800         /* should never get here */
 801 }
 802
 803
 804 /*
 805  * Search for a property in both the top level and in a VEVENT subcomponent
 806  */
 807 icalproperty *ical_ctdl_get_subprop(
 808                 icalcomponent *cal,
 809                 icalproperty_kind which_prop
 810 ) {
 811         icalproperty *p;
 812         icalcomponent *c;
 813
 814         p = icalcomponent_get_first_property(cal, which_prop);
 815         if (p == NULL) {
 816                 c = icalcomponent_get_first_component(cal,
 817                                                         ICAL_VEVENT_COMPONENT);
 818                 if (c != NULL) {
 819                         p = icalcomponent_get_first_property(c, which_prop);
 820                 }
 821         }
 822         return p;
 823 }
 824
 825
 826 /*
 827  * Check to see if two events overlap.  Returns nonzero if they do.
 828  * (This function is used in both Citadel and WebCit.  If you change it in
 829  * one place, change it in the other.  Better yet, put it in a library.)
 830  */
 831 int ical_ctdl_is_overlap(
 832                         struct icaltimetype t1start,
 833                         struct icaltimetype t1end,
 834                         struct icaltimetype t2start,
 835                         struct icaltimetype t2end
 836 ) {
 837
 838         if (icaltime_is_null_time(t1start)) return(0);
 839         if (icaltime_is_null_time(t2start)) return(0);
 840
 841         /* First, check for all-day events */
 842         if (t1start.is_date) {
 843                 if (!icaltime_compare_date_only(t1start, t2start)) {
 844                         return(1);
 845                 }
 846                 if (!icaltime_is_null_time(t2end)) {
 847                         if (!icaltime_compare_date_only(t1start, t2end)) {
 848                                 return(1);
 849                         }
 850                 }
 851         }
 852
 853         if (t2start.is_date) {
 854                 if (!icaltime_compare_date_only(t2start, t1start)) {
 855                         return(1);
 856                 }
 857                 if (!icaltime_is_null_time(t1end)) {
 858                         if (!icaltime_compare_date_only(t2start, t1end)) {
 859                                 return(1);
 860                         }
 861                 }
 862         }
 863
 864         /* Now check for overlaps using date *and* time. */
 865
 866         /* First, bail out if either event 1 or event 2 is missing end time. */
 867         if (icaltime_is_null_time(t1end)) return(0);
 868         if (icaltime_is_null_time(t2end)) return(0);
 869
 870         /* If event 1 ends before event 2 starts, we're in the clear. */
 871         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 872
 873         /* If event 2 ends before event 1 starts, we're also ok. */
 874         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 875
 876         /* Otherwise, they overlap. */
 877         return(1);
 878 }
 879
 880
 881
 882 /*
 883  * Backend for ical_hunt_for_conflicts()
 884  */
 885 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 886         icalcomponent *cal;
 887         struct CtdlMessage *msg;
 888         struct ical_respond_data ird;
 889         struct icaltimetype t1start, t1end, t2start, t2end;
 890         icalproperty *p;
 891         char conflict_event_uid[SIZ];
 892         char conflict_event_summary[SIZ];
 893         char compare_uid[SIZ];
 894
 895         cal = (icalcomponent *)data;
 896         strcpy(compare_uid, "");
 897         strcpy(conflict_event_uid, "");
 898         strcpy(conflict_event_summary, "");
 899
 900         msg = CtdlFetchMessage(msgnum);
 901         if (msg == NULL) return;
 902         memset(&ird, 0, sizeof ird);
 903         strcpy(ird.desired_partnum, "_HUNT_");
 904         mime_parser(msg->cm_fields['M'],
 905                 NULL,
 906                 *ical_locate_part,              /* callback function */
 907                 NULL, NULL,
 908                 (void *) &ird,                  /* user data */
 909                 0
 910         );
 911         CtdlFreeMessage(msg);
 912
 913         if (ird.cal == NULL) return;
 914
 915         t1start = icaltime_null_time();
 916         t1end = icaltime_null_time();
 917         t2start = icaltime_null_time();
 918         t1end = icaltime_null_time();
 919
 920         /* Now compare cal to ird.cal */
 921         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 922         if (p == NULL) return;
 923         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 924
 925         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 926         if (p != NULL) t2end = icalproperty_get_dtend(p);
 927
 928         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 929         if (p == NULL) return;
 930         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 931
 932         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 933         if (p != NULL) t1end = icalproperty_get_dtend(p);
 934
 935         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 936         if (p != NULL) {
 937                 strcpy(compare_uid, icalproperty_get_comment(p));
 938         }
 939
 940         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 941         if (p != NULL) {
 942                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 943         }
 944
 945         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 946         if (p != NULL) {
 947                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 948         }
 949
 950         icalcomponent_free(ird.cal);
 951
 952         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 953                 cprintf("%ld||%s|%s|%d|\n",
 954                         msgnum,
 955                         conflict_event_uid,
 956                         conflict_event_summary,
 957                         (       ((strlen(compare_uid)>0)
 958                                 &&(!strcasecmp(compare_uid,
 959                                 conflict_event_uid))) ? 1 : 0
 960                         )
 961                 );
 962         }
 963 }
 964
 965
 966
 967 /*
 968  * Phase 2 of "hunt for conflicts" operation.
 969  * At this point we have a calendar object which represents the VEVENT that
 970  * we're considering adding to the calendar.  Now hunt through the user's
 971  * calendar room, and output zero or more existing VEVENTs which conflict
 972  * with this one.
 973  */
 974 void ical_hunt_for_conflicts(icalcomponent *cal) {
 975         char hold_rm[ROOMNAMELEN];
 976
 977         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 978
 979         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 980                 getroom(&CC->room, hold_rm);
 981                 cprintf("%d You do not have a calendar.\n", ERROR);
 982                 return;
 983         }
 984
 985         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 986
 987         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 988                 NULL,
 989                 ical_hunt_for_conflicts_backend,
 990                 (void *) cal
 991         );
 992
 993         cprintf("000\n");
 994         getroom(&CC->room, hold_rm);    /* return to saved room */
 995
 996 }
 997
 998
 999
1000 /*
1001  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1002  */
1003 void ical_conflicts(long msgnum, char *partnum) {
1004         struct CtdlMessage *msg;
1005         struct ical_respond_data ird;
1006
1007         msg = CtdlFetchMessage(msgnum);
1008         if (msg == NULL) {
1009                 cprintf("%d Message %ld not found.\n",
1010                         ERROR+ILLEGAL_VALUE,
1011                         (long)msgnum
1012                 );
1013                 return;
1014         }
1015
1016         memset(&ird, 0, sizeof ird);
1017         strcpy(ird.desired_partnum, partnum);
1018         mime_parser(msg->cm_fields['M'],
1019                 NULL,
1020                 *ical_locate_part,              /* callback function */
1021                 NULL, NULL,
1022                 (void *) &ird,                  /* user data */
1023                 0
1024         );
1025
1026         CtdlFreeMessage(msg);
1027
1028         if (ird.cal != NULL) {
1029                 ical_hunt_for_conflicts(ird.cal);
1030                 icalcomponent_free(ird.cal);
1031                 return;
1032         }
1033         else {
1034                 cprintf("%d No calendar object found\n", ERROR);
1035                 return;
1036         }
1037
1038         /* should never get here */
1039 }
1040
1041
1042
1043 /*
1044  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1045  */
1046 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1047         icalproperty *p;
1048         icalvalue *v;
1049         struct icalperiodtype my_period;
1050
1051         if (cal == NULL) return;
1052         my_period = icalperiodtype_null_period();
1053
1054         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1055                 ical_add_to_freebusy(fb,
1056                         icalcomponent_get_first_component(
1057                                 cal, ICAL_VEVENT_COMPONENT
1058                         )
1059                 );
1060                 return;
1061         }
1062
1063         ical_dezonify(cal);
1064
1065         /* If this event is not opaque, the user isn't publishing it as
1066          * busy time, so don't bother doing anything else.
1067          */
1068         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1069         if (p != NULL) {
1070                 v = icalproperty_get_value(p);
1071                 if (v != NULL) {
1072                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1073                                 return;
1074                         }
1075                 }
1076         }
1077
1078         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1079         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1080         if (p != NULL) {
1081                 my_period.start = icalproperty_get_dtstart(p);
1082         }
1083
1084         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1085         if (p != NULL) {
1086                 my_period.end = icalproperty_get_dtstart(p);
1087         }
1088
1089         /* Now add it. */
1090         icalcomponent_add_property(fb,
1091                 icalproperty_new_freebusy(my_period)
1092         );
1093
1094 }
1095
1096
1097
1098 /*
1099  * Backend for ical_freebusy()
1100  *
1101  * This function simply loads the messages in the user's calendar room,
1102  * which contain VEVENTs, then strips them of all non-freebusy data, and
1103  * adds them to the supplied VCALENDAR.
1104  *
1105  */
1106 void ical_freebusy_backend(long msgnum, void *data) {
1107         icalcomponent *cal;
1108         struct CtdlMessage *msg;
1109         struct ical_respond_data ird;
1110
1111         cal = (icalcomponent *)data;
1112
1113         msg = CtdlFetchMessage(msgnum);
1114         if (msg == NULL) return;
1115         memset(&ird, 0, sizeof ird);
1116         strcpy(ird.desired_partnum, "_HUNT_");
1117         mime_parser(msg->cm_fields['M'],
1118                 NULL,
1119                 *ical_locate_part,              /* callback function */
1120                 NULL, NULL,
1121                 (void *) &ird,                  /* user data */
1122                 0
1123         );
1124         CtdlFreeMessage(msg);
1125
1126         if (ird.cal == NULL) return;
1127
1128         ical_add_to_freebusy(cal, ird.cal);
1129
1130         /* Now free the memory. */
1131         icalcomponent_free(ird.cal);
1132 }
1133
1134
1135
1136 /*
1137  * Grab another user's free/busy times
1138  */
1139 void ical_freebusy(char *who) {
1140         struct ctdluser usbuf;
1141         char calendar_room_name[ROOMNAMELEN];
1142         char hold_rm[ROOMNAMELEN];
1143         char *serialized_request = NULL;
1144         icalcomponent *encaps = NULL;
1145         icalcomponent *fb = NULL;
1146
1147         if (getuser(&usbuf, who) != 0) {
1148                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1149                 return;
1150         }
1151
1152         MailboxName(calendar_room_name, sizeof calendar_room_name,
1153                 &usbuf, USERCALENDARROOM);
1154
1155         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1156
1157         if (getroom(&CC->room, calendar_room_name) != 0) {
1158                 cprintf("%d Cannot open calendar\n", ERROR+ROOM_NOT_FOUND);
1159                 getroom(&CC->room, hold_rm);
1160                 return;
1161         }
1162
1163         /* Create a VFREEBUSY subcomponent */
1164         lprintf(9, "Creating VFREEBUSY component\n");
1165         fb = icalcomponent_new_vfreebusy();
1166         if (fb == NULL) {
1167                 cprintf("%d Internal error: cannot allocate memory.\n",
1168                         ERROR+INTERNAL_ERROR);
1169                 icalcomponent_free(encaps);
1170                 getroom(&CC->room, hold_rm);
1171                 return;
1172         }
1173
1174         lprintf(9, "Adding busy time from events\n");
1175         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
1176                 NULL, ical_freebusy_backend, (void *)fb
1177         );
1178
1179         /* Set the method to PUBLISH */
1180         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1181
1182         /* Set the DTSTAMP to right now. */
1183         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1184
1185         /* FIXME we still need (at least) DTSTART, DTEND, and the user's
1186          * e-mail address as ORGANIZER.
1187          */
1188
1189         /* Put the freebusy component into the calendar component */
1190         lprintf(9, "Encapsulating\n");
1191         encaps = ical_encapsulate_subcomponent(fb);
1192         if (encaps == NULL) {
1193                 icalcomponent_free(fb);
1194                 cprintf("%d Internal error: cannot allocate memory.\n",
1195                         ERROR+INTERNAL_ERROR);
1196                 getroom(&CC->room, hold_rm);
1197                 return;
1198         }
1199
1200         /* Set the method to PUBLISH */
1201         lprintf(9, "Setting method\n");
1202         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1203
1204         /* Serialize it */
1205         lprintf(9, "Serializing\n");
1206         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1207         icalcomponent_free(encaps);     /* Don't need this anymore. */
1208
1209         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1210         if (serialized_request != NULL) {
1211                 client_write(serialized_request, strlen(serialized_request));
1212                 phree(serialized_request);
1213         }
1214         cprintf("\n000\n");
1215
1216         /* Go back to the room from which we came... */
1217         getroom(&CC->room, hold_rm);
1218 }
1219
1220
1221
1222
1223 /*
1224  * All Citadel calendar commands from the client come through here.
1225  */
1226 void cmd_ical(char *argbuf)
1227 {
1228         char subcmd[SIZ];
1229         long msgnum;
1230         char partnum[SIZ];
1231         char action[SIZ];
1232         char who[SIZ];
1233
1234         extract(subcmd, argbuf, 0);
1235
1236         /* Allow "test" and "freebusy" subcommands without logging in. */
1237
1238         if (!strcmp(subcmd, "test")) {
1239                 cprintf("%d This server supports calendaring\n", CIT_OK);
1240                 return;
1241         }
1242
1243         if (!strcmp(subcmd, "freebusy")) {
1244                 extract(who, argbuf, 1);
1245                 ical_freebusy(who);
1246                 return;
1247         }
1248
1249         if (CtdlAccessCheck(ac_logged_in)) return;
1250
1251         if (!strcmp(subcmd, "respond")) {
1252                 msgnum = extract_long(argbuf, 1);
1253                 extract(partnum, argbuf, 2);
1254                 extract(action, argbuf, 3);
1255                 ical_respond(msgnum, partnum, action);
1256                 return;
1257         }
1258
1259         if (!strcmp(subcmd, "handle_rsvp")) {
1260                 msgnum = extract_long(argbuf, 1);
1261                 extract(partnum, argbuf, 2);
1262                 extract(action, argbuf, 3);
1263                 ical_handle_rsvp(msgnum, partnum, action);
1264                 return;
1265         }
1266
1267         if (!strcmp(subcmd, "conflicts")) {
1268                 msgnum = extract_long(argbuf, 1);
1269                 extract(partnum, argbuf, 2);
1270                 ical_conflicts(msgnum, partnum);
1271                 return;
1272         }
1273
1274         cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
1275 }
1276
1277
1278
1279 /*
1280  * We don't know if the calendar room exists so we just create it at login
1281  */
1282 void ical_create_room(void)
1283 {
1284         struct ctdlroom qr;
1285         struct visit vbuf;
1286
1287         /* Create the calendar room if it doesn't already exist */
1288         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
1289
1290         /* Set expiration policy to manual; otherwise objects will be lost! */
1291         if (lgetroom(&qr, USERCALENDARROOM)) {
1292                 lprintf(3, "Couldn't get the user calendar room!\n");
1293                 return;
1294         }
1295         qr.QRep.expire_mode = EXPIRE_MANUAL;
1296         qr.QRdefaultview = 3;   /* 3 = calendar view */
1297         lputroom(&qr);
1298
1299         /* Set the view to a calendar view */
1300         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1301         vbuf.v_view = 3;        /* 3 = calendar */
1302         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1303
1304         /* Create the tasks list room if it doesn't already exist */
1305         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
1306
1307         /* Set expiration policy to manual; otherwise objects will be lost! */
1308         if (lgetroom(&qr, USERTASKSROOM)) {
1309                 lprintf(3, "Couldn't get the user calendar room!\n");
1310                 return;
1311         }
1312         qr.QRep.expire_mode = EXPIRE_MANUAL;
1313         qr.QRdefaultview = 4;   /* 4 = tasks view */
1314         lputroom(&qr);
1315
1316         /* Set the view to a task list view */
1317         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1318         vbuf.v_view = 4;        /* 4 = tasks */
1319         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1320
1321         return;
1322 }
1323
1324
1325 /*
1326  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1327  * finds a VEVENT.
1328  */
1329 void ical_send_out_invitations(icalcomponent *cal) {
1330         icalcomponent *the_request = NULL;
1331         char *serialized_request = NULL;
1332         icalcomponent *encaps = NULL;
1333         char *request_message_text = NULL;
1334         struct CtdlMessage *msg = NULL;
1335         struct recptypes *valid = NULL;
1336         char attendees_string[SIZ];
1337         int num_attendees = 0;
1338         char this_attendee[SIZ];
1339         icalproperty *attendee = NULL;
1340         char summary_string[SIZ];
1341         icalproperty *summary = NULL;
1342
1343         if (cal == NULL) {
1344                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
1345                 return;
1346         }
1347
1348
1349         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1350         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1351                 ical_send_out_invitations(
1352                         icalcomponent_get_first_component(
1353                                 cal, ICAL_VEVENT_COMPONENT
1354                         )
1355                 );
1356                 return;
1357         }
1358
1359         /* Clone the event */
1360         the_request = icalcomponent_new_clone(cal);
1361         if (the_request == NULL) {
1362                 lprintf(3, "ERROR: cannot clone calendar object\n");
1363                 return;
1364         }
1365
1366         /* Extract the summary string -- we'll use it as the
1367          * message subject for the request
1368          */
1369         strcpy(summary_string, "Meeting request");
1370         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1371         if (summary != NULL) {
1372                 if (icalproperty_get_summary(summary)) {
1373                         strcpy(summary_string,
1374                                 icalproperty_get_summary(summary) );
1375                 }
1376         }
1377
1378         /* Determine who the recipients of this message are (the attendees) */
1379         strcpy(attendees_string, "");
1380         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1381                 if (icalproperty_get_attendee(attendee)) {
1382                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1383                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1384                                 strcpy(this_attendee, &this_attendee[7]);
1385                                 snprintf(&attendees_string[strlen(attendees_string)],
1386                                         sizeof(attendees_string) - strlen(attendees_string),
1387                                         "%s, ",
1388                                         this_attendee
1389                                 );
1390                                 ++num_attendees;
1391                         }
1392                 }
1393         }
1394
1395         lprintf(9, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1396
1397         /* If there are no attendees, there are no invitations to send, so...
1398          * don't bother putting one together!  Punch out, Maverick!
1399          */
1400         if (num_attendees == 0) {
1401                 icalcomponent_free(the_request);
1402                 return;
1403         }
1404
1405         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1406         encaps = icalcomponent_new_vcalendar();
1407         if (encaps == NULL) {
1408                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
1409                         __FILE__, __LINE__);
1410                 icalcomponent_free(the_request);
1411                 return;
1412         }
1413
1414         /* Set the Product ID */
1415         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1416
1417         /* Set the Version Number */
1418         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1419
1420         /* Set the method to REQUEST */
1421         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1422
1423         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1424         ical_dezonify(the_request);
1425
1426         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1427          * are responsible for "the_request"'s memory -- it will be freed
1428          * when we free "encaps".
1429          */
1430         icalcomponent_add_component(encaps, the_request);
1431
1432         /* Serialize it */
1433         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1434         icalcomponent_free(encaps);     /* Don't need this anymore. */
1435         if (serialized_request == NULL) return;
1436
1437         request_message_text = mallok(strlen(serialized_request) + SIZ);
1438         if (request_message_text != NULL) {
1439                 sprintf(request_message_text,
1440                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1441                         serialized_request
1442                 );
1443
1444                 msg = CtdlMakeMessage(&CC->user,
1445                         "",                     /* No single recipient here */
1446                         CC->room.QRname, 0, FMT_RFC822,
1447                         "",
1448                         summary_string,         /* Use summary for subject */
1449                         request_message_text);
1450
1451                 if (msg != NULL) {
1452                         valid = validate_recipients(attendees_string);
1453                         CtdlSubmitMsg(msg, valid, "");
1454                         CtdlFreeMessage(msg);
1455                 }
1456         }
1457         phree(serialized_request);
1458 }
1459
1460
1461 /*
1462  * When a calendar object is being saved, determine whether it's a VEVENT
1463  * and the user saving it is the organizer.  If so, send out invitations
1464  * to any listed attendees.
1465  *
1466  */
1467 void ical_saving_vevent(icalcomponent *cal) {
1468         icalcomponent *c;
1469         icalproperty *organizer = NULL;
1470         char organizer_string[SIZ];
1471
1472         /* Don't send out invitations if we've been asked not to. */
1473         lprintf(9, "CIT_ICAL->avoid_sending_invitations = %d\n",
1474                 CIT_ICAL->avoid_sending_invitations);
1475         if (CIT_ICAL->avoid_sending_invitations > 0) {
1476                 return;
1477         }
1478
1479         strcpy(organizer_string, "");
1480         /*
1481          * The VEVENT subcomponent is the one we're interested in.
1482          * Send out invitations if, and only if, this user is the Organizer.
1483          */
1484         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1485                 organizer = icalcomponent_get_first_property(cal,
1486                                                 ICAL_ORGANIZER_PROPERTY);
1487                 if (organizer != NULL) {
1488                         if (icalproperty_get_organizer(organizer)) {
1489                                 strcpy(organizer_string,
1490                                         icalproperty_get_organizer(organizer));
1491                         }
1492                 }
1493                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1494                         strcpy(organizer_string, &organizer_string[7]);
1495                         striplt(organizer_string);
1496                         /*
1497                          * If the user saving the event is listed as the
1498                          * organizer, then send out invitations.
1499                          */
1500                         if (CtdlIsMe(organizer_string)) {
1501                                 ical_send_out_invitations(cal);
1502                         }
1503                 }
1504         }
1505
1506         /* If the component has subcomponents, recurse through them. */
1507         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1508             (c != NULL);
1509             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1510                 /* Recursively process subcomponent */
1511                 ical_saving_vevent(c);
1512         }
1513
1514 }
1515
1516
1517
1518 /*
1519  * Back end for ical_obj_beforesave()
1520  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1521  * the summary of the event (becomes message subject),
1522  * and the start time (becomes message date/time).
1523  */
1524 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1525                 char *disp, void *content, char *cbtype, size_t length,
1526                 char *encoding, void *cbuserdata)
1527 {
1528         icalcomponent *cal;
1529         icalproperty *p;
1530         struct icalmessagemod *imm;
1531
1532         imm = (struct icalmessagemod *)cbuserdata;
1533
1534         /* If this is a text/calendar object, hunt for the UID and drop it in
1535          * the "user data" pointer for the MIME parser.  When
1536          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1537          * to that string.
1538          */
1539         if (!strcasecmp(cbtype, "text/calendar")) {
1540                 cal = icalcomponent_new_from_string(content);
1541                 if (cal != NULL) {
1542                         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1543                                 cal = icalcomponent_get_first_component(
1544                                         cal, ICAL_VEVENT_COMPONENT
1545                                 );
1546                         }
1547                 }
1548                 if (cal != NULL) {
1549                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1550                         if (p != NULL) {
1551                                 strcpy(imm->uid, icalproperty_get_comment(p));
1552                         }
1553                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1554                         if (p != NULL) {
1555                                 strcpy(imm->subject,
1556                                                 icalproperty_get_comment(p));
1557                         }
1558                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1559                         if (p != NULL) {
1560                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1561                         }
1562                         icalcomponent_free(cal);
1563                 }
1564         }
1565 }
1566
1567
1568
1569
1570
1571 /*
1572  * See if we need to prevent the object from being saved (we don't allow
1573  * MIME types other than text/calendar in the Calendar> room).  Also, when
1574  * saving an event to the calendar, set the message's Citadel extended message
1575  * ID to the UID of the object.  This causes our replication checker to
1576  * automatically delete any existing instances of the same object.  (Isn't
1577  * that cool?)
1578  *
1579  * We also set the message's Subject to the event summary, and the Date/time to
1580  * the event start time.
1581  */
1582 int ical_obj_beforesave(struct CtdlMessage *msg)
1583 {
1584         char roomname[ROOMNAMELEN];
1585         char *p;
1586         int a;
1587         struct icalmessagemod imm;
1588
1589         /*
1590          * Only messages with content-type text/calendar
1591          * may be saved to Calendar>.  If the message is bound for
1592          * Calendar> but doesn't have this content-type, throw an error
1593          * so that the message may not be posted.
1594          */
1595
1596         /* First determine if this is our room */
1597         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1598         if (strcasecmp(roomname, CC->room.QRname)) {
1599                 return 0;       /* It's not the Calendar room. */
1600         }
1601
1602         /* Then determine content-type of the message */
1603
1604         /* It must be an RFC822 message! */
1605         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1606         if (msg->cm_format_type != 4)
1607                 return 1;       /* You tried to save a non-RFC822 message! */
1608
1609         /* Find the Content-Type: header */
1610         p = msg->cm_fields['M'];
1611         a = strlen(p);
1612         while (--a > 0) {
1613                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1614                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1615                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1616                                 mime_parser(msg->cm_fields['M'],
1617                                         NULL,
1618                                         *ical_ctdl_set_extended_msgid,
1619                                         NULL, NULL,
1620                                         (void *)&imm,
1621                                         0
1622                                 );
1623                                 if (strlen(imm.uid) > 0) {
1624                                         if (msg->cm_fields['E'] != NULL) {
1625                                                 phree(msg->cm_fields['E']);
1626                                         }
1627                                         msg->cm_fields['E'] = strdoop(imm.uid);
1628                                 }
1629                                 if (strlen(imm.subject) > 0) {
1630                                         if (msg->cm_fields['U'] != NULL) {
1631                                                 phree(msg->cm_fields['U']);
1632                                         }
1633                                         msg->cm_fields['U'] = strdoop(imm.subject);
1634                                 }
1635                                 if (imm.dtstart > 0) {
1636                                         if (msg->cm_fields['T'] != NULL) {
1637                                                 phree(msg->cm_fields['T']);
1638                                         }
1639                                         msg->cm_fields['T'] = strdoop("000000000000000000");
1640                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1641                                 }
1642                                 return 0;
1643                         }
1644                         else {
1645                                 return 1;
1646                         }
1647                 }
1648                 p++;
1649         }
1650
1651         /* Oops!  No Content-Type in this message!  How'd that happen? */
1652         lprintf(7, "RFC822 message with no Content-Type header!\n");
1653         return 1;
1654 }
1655
1656
1657 /*
1658  * Things we need to do after saving a calendar event.
1659  */
1660 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1661                 char *disp, void *content, char *cbtype, size_t length,
1662                 char *encoding, void *cbuserdata)
1663 {
1664         icalcomponent *cal;
1665
1666         /* If this is a text/calendar object, hunt for the UID and drop it in
1667          * the "user data" pointer for the MIME parser.  When
1668          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1669          * to that string.
1670          */
1671         if (!strcasecmp(cbtype, "text/calendar")) {
1672                 cal = icalcomponent_new_from_string(content);
1673                 if (cal != NULL) {
1674                         ical_saving_vevent(cal);
1675                         icalcomponent_free(cal);
1676                 }
1677         }
1678 }
1679
1680
1681 /*
1682  * Things we need to do after saving a calendar event.
1683  */
1684 int ical_obj_aftersave(struct CtdlMessage *msg)
1685 {
1686         char roomname[ROOMNAMELEN];
1687         char *p;
1688         int a;
1689
1690         /*
1691          * If this isn't the Calendar> room, no further action is necessary.
1692          */
1693
1694         /* First determine if this is our room */
1695         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1696         if (strcasecmp(roomname, CC->room.QRname)) {
1697                 return 0;       /* It's not the Calendar room. */
1698         }
1699
1700         /* Then determine content-type of the message */
1701
1702         /* It must be an RFC822 message! */
1703         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1704         if (msg->cm_format_type != 4) return(1);
1705
1706         /* Find the Content-Type: header */
1707         p = msg->cm_fields['M'];
1708         a = strlen(p);
1709         while (--a > 0) {
1710                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1711                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1712                                 mime_parser(msg->cm_fields['M'],
1713                                         NULL,
1714                                         *ical_obj_aftersave_backend,
1715                                         NULL, NULL,
1716                                         NULL,
1717                                         0
1718                                 );
1719                                 return 0;
1720                         }
1721                         else {
1722                                 return 1;
1723                         }
1724                 }
1725                 p++;
1726         }
1727
1728         /* Oops!  No Content-Type in this message!  How'd that happen? */
1729         lprintf(7, "RFC822 message with no Content-Type header!\n");
1730         return 1;
1731 }
1732
1733
1734 void ical_session_startup(void) {
1735         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1736         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1737 }
1738
1739
1740 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
1741
1742 /*
1743  * Register this module with the Citadel server.
1744  */
1745 char *serv_calendar_init(void)
1746 {
1747 #ifdef CITADEL_WITH_CALENDAR_SERVICE
1748         SYM_CIT_ICAL = CtdlGetDynamicSymbol();
1749         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1750         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1751         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1752         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1753         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1754 #endif
1755         return "$Id$";
1756 }