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 <stdlib.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <limits.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #ifdef HAVE_STRINGS_H
  20 #include <strings.h>
  21 #endif
  22 #include "citadel.h"
  23 #include "server.h"
  24 #include "citserver.h"
  25 #include "sysdep_decls.h"
  26 #include "support.h"
  27 #include "config.h"
  28 #include "serv_extensions.h"
  29 #include "user_ops.h"
  30 #include "room_ops.h"
  31 #include "tools.h"
  32 #include "msgbase.h"
  33 #include "mime_parser.h"
  34 #include "serv_calendar.h"
  35
  36 #ifdef CITADEL_WITH_CALENDAR_SERVICE
  37
  38 #include <ical.h>
  39 #include "ical_dezonify.h"
  40
  41 struct ical_respond_data {
  42         char desired_partnum[SIZ];
  43         icalcomponent *cal;
  44 };
  45
  46
  47 /*
  48  * Utility function to create a new VCALENDAR component with some of the
  49  * required fields already set the way we like them.
  50  */
  51 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  52         icalcomponent *encaps;
  53
  54         encaps = icalcomponent_new_vcalendar();
  55         if (encaps == NULL) {
  56                 lprintf(CTDL_CRIT, "Error at %s:%d - could not allocate component!\n",
  57                         __FILE__, __LINE__);
  58                 return NULL;
  59         }
  60
  61         /* Set the Product ID */
  62         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  63
  64         /* Set the Version Number */
  65         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  66
  67         return(encaps);
  68 }
  69
  70
  71 /*
  72  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  73  */
  74 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  75         icalcomponent *encaps;
  76
  77         /* If we're already looking at a full VCALENDAR component,
  78          * don't bother ... just return itself.
  79          */
  80         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  81                 return subcomp;
  82         }
  83
  84         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  85         encaps = icalcomponent_new_citadel_vcalendar();
  86         if (encaps == NULL) return NULL;
  87
  88         /* Encapsulate the subcomponent inside */
  89         icalcomponent_add_component(encaps, subcomp);
  90
  91         /* Convert all timestamps to UTC so we don't have to deal with
  92          * stupid VTIMEZONE crap.
  93          */
  94         ical_dezonify(encaps);
  95
  96         /* Return the object we just created. */
  97         return(encaps);
  98 }
  99
 100
 101
 102
 103 /*
 104  * Write a calendar object into the specified user's calendar room.
 105  *
 106  * ok
 107  */
 108 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 109         char temp[PATH_MAX];
 110         FILE *fp;
 111         char *ser;
 112         icalcomponent *encaps;
 113
 114         if (cal == NULL) return;
 115
 116         /* If the supplied object is a subcomponent, encapsulate it in
 117          * a full VCALENDAR component, and save that instead.
 118          */
 119         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 120                 encaps = ical_encapsulate_subcomponent(
 121                         icalcomponent_new_clone(cal)
 122                 );
 123                 ical_write_to_cal(u, encaps);
 124                 icalcomponent_free(encaps);
 125                 return;
 126         }
 127
 128         strcpy(temp, tmpnam(NULL));
 129         ser = icalcomponent_as_ical_string(cal);
 130         if (ser == NULL) return;
 131
 132         /* Make a temp file out of it */
 133         fp = fopen(temp, "w");
 134         if (fp == NULL) return;
 135         fwrite(ser, strlen(ser), 1, fp);
 136         fclose(fp);
 137
 138         /* This handy API function does all the work for us.
 139          */
 140         CtdlWriteObject(USERCALENDARROOM,       /* which room */
 141                         "text/calendar",        /* MIME type */
 142                         temp,                   /* temp file */
 143                         u,                      /* which user */
 144                         0,                      /* not binary */
 145                         0,              /* don't delete others of this type */
 146                         0);                     /* no flags */
 147
 148         unlink(temp);
 149 }
 150
 151
 152 /*
 153  * Add a calendar object to the user's calendar
 154  *
 155  * ok because it uses ical_write_to_cal()
 156  */
 157 void ical_add(icalcomponent *cal, int recursion_level) {
 158         icalcomponent *c;
 159
 160         /*
 161          * The VEVENT subcomponent is the one we're interested in saving.
 162          */
 163         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 164
 165                 ical_write_to_cal(&CC->user, cal);
 166
 167         }
 168
 169         /* If the component has subcomponents, recurse through them. */
 170         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 171             (c != 0);
 172             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 173                 /* Recursively process subcomponent */
 174                 ical_add(c, recursion_level+1);
 175         }
 176
 177 }
 178
 179
 180
 181 /*
 182  * Send a reply to a meeting invitation.
 183  *
 184  * 'request' is the invitation to reply to.
 185  * 'action' is the string "accept" or "decline".
 186  *
 187  * (Sorry about this being more than 80 columns ... there was just
 188  * no easy way to break it down sensibly.)
 189  *
 190  * ok
 191  */
 192 void ical_send_a_reply(icalcomponent *request, char *action) {
 193         icalcomponent *the_reply = NULL;
 194         icalcomponent *vevent = NULL;
 195         icalproperty *attendee = NULL;
 196         char attendee_string[SIZ];
 197         icalproperty *organizer = NULL;
 198         char organizer_string[SIZ];
 199         icalproperty *summary = NULL;
 200         char summary_string[SIZ];
 201         icalproperty *me_attend = NULL;
 202         struct recptypes *recp = NULL;
 203         icalparameter *partstat = NULL;
 204         char *serialized_reply = NULL;
 205         char *reply_message_text = NULL;
 206         struct CtdlMessage *msg = NULL;
 207         struct recptypes *valid = NULL;
 208
 209         strcpy(organizer_string, "");
 210         strcpy(summary_string, "Calendar item");
 211
 212         if (request == NULL) {
 213                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
 214                 return;
 215         }
 216
 217         the_reply = icalcomponent_new_clone(request);
 218         if (the_reply == NULL) {
 219                 lprintf(CTDL_ERR, "ERROR: cannot clone request\n");
 220                 return;
 221         }
 222
 223         /* Change the method from REQUEST to REPLY */
 224         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 225
 226         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 227         if (vevent != NULL) {
 228                 /* Hunt for attendees, removing ones that aren't us.
 229                  * (Actually, remove them all, cloning our own one so we can
 230                  * re-insert it later)
 231                  */
 232                 while (attendee = icalcomponent_get_first_property(vevent,
 233                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 234                 ) {
 235                         if (icalproperty_get_attendee(attendee)) {
 236                                 strcpy(attendee_string,
 237                                         icalproperty_get_attendee(attendee) );
 238                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 239                                         strcpy(attendee_string, &attendee_string[7]);
 240                                         striplt(attendee_string);
 241                                         recp = validate_recipients(attendee_string);
 242                                         if (recp != NULL) {
 243                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 244                                                         if (me_attend) icalproperty_free(me_attend);
 245                                                         me_attend = icalproperty_new_clone(attendee);
 246                                                 }
 247                                                 free(recp);
 248                                         }
 249                                 }
 250                         }
 251                         /* Remove it... */
 252                         icalcomponent_remove_property(vevent, attendee);
 253                         icalproperty_free(attendee);
 254                 }
 255
 256                 /* We found our own address in the attendee list. */
 257                 if (me_attend) {
 258                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 259                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 260
 261                         if (!strcasecmp(action, "accept")) {
 262                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 263                         }
 264                         else if (!strcasecmp(action, "decline")) {
 265                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 266                         }
 267                         else if (!strcasecmp(action, "tentative")) {
 268                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 269                         }
 270
 271                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 272
 273                         /* Now insert it back into the vevent. */
 274                         icalcomponent_add_property(vevent, me_attend);
 275                 }
 276
 277                 /* Figure out who to send this thing to */
 278                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 279                 if (organizer != NULL) {
 280                         if (icalproperty_get_organizer(organizer)) {
 281                                 strcpy(organizer_string,
 282                                         icalproperty_get_organizer(organizer) );
 283                         }
 284                 }
 285                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 286                         strcpy(organizer_string, &organizer_string[7]);
 287                         striplt(organizer_string);
 288                 } else {
 289                         strcpy(organizer_string, "");
 290                 }
 291
 292                 /* Extract the summary string -- we'll use it as the
 293                  * message subject for the reply
 294                  */
 295                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 296                 if (summary != NULL) {
 297                         if (icalproperty_get_summary(summary)) {
 298                                 strcpy(summary_string,
 299                                         icalproperty_get_summary(summary) );
 300                         }
 301                 }
 302
 303         }
 304
 305         /* Now generate the reply message and send it out. */
 306         serialized_reply = strdup(icalcomponent_as_ical_string(the_reply));
 307         icalcomponent_free(the_reply);  /* don't need this anymore */
 308         if (serialized_reply == NULL) return;
 309
 310         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 311         if (reply_message_text != NULL) {
 312                 sprintf(reply_message_text,
 313                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 314                         serialized_reply
 315                 );
 316
 317                 msg = CtdlMakeMessage(&CC->user, organizer_string,
 318                         CC->room.QRname, 0, FMT_RFC822,
 319                         "",
 320                         summary_string,         /* Use summary for subject */
 321                         reply_message_text);
 322
 323                 if (msg != NULL) {
 324                         valid = validate_recipients(organizer_string);
 325                         CtdlSubmitMsg(msg, valid, "");
 326                         CtdlFreeMessage(msg);
 327                 }
 328         }
 329         free(serialized_reply);
 330 }
 331
 332
 333
 334 /*
 335  * Callback function for mime parser that hunts for calendar content types
 336  * and turns them into calendar objects
 337  */
 338 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 339                 void *content, char *cbtype, size_t length, char *encoding,
 340                 void *cbuserdata) {
 341
 342         struct ical_respond_data *ird = NULL;
 343
 344         ird = (struct ical_respond_data *) cbuserdata;
 345
 346         /* desired_partnum can be set to "_HUNT_" to have it just look for
 347          * the first part with a content type of text/calendar.  Otherwise
 348          * we have to only process the right one.
 349          */
 350         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 351                 if (strcasecmp(partnum, ird->desired_partnum)) {
 352                         return;
 353                 }
 354         }
 355
 356         if (strcasecmp(cbtype, "text/calendar")) {
 357                 return;
 358         }
 359
 360         if (ird->cal != NULL) {
 361                 icalcomponent_free(ird->cal);
 362                 ird->cal = NULL;
 363         }
 364
 365         ird->cal = icalcomponent_new_from_string(content);
 366         if (ird->cal != NULL) {
 367                 ical_dezonify(ird->cal);
 368         }
 369 }
 370
 371
 372 /*
 373  * Respond to a meeting request.
 374  */
 375 void ical_respond(long msgnum, char *partnum, char *action) {
 376         struct CtdlMessage *msg;
 377         struct ical_respond_data ird;
 378
 379         if (
 380            (strcasecmp(action, "accept"))
 381            && (strcasecmp(action, "decline"))
 382         ) {
 383                 cprintf("%d Action must be 'accept' or 'decline'\n",
 384                         ERROR + ILLEGAL_VALUE
 385                 );
 386                 return;
 387         }
 388
 389         msg = CtdlFetchMessage(msgnum);
 390         if (msg == NULL) {
 391                 cprintf("%d Message %ld not found.\n",
 392                         ERROR + ILLEGAL_VALUE,
 393                         (long)msgnum
 394                 );
 395                 return;
 396         }
 397
 398         memset(&ird, 0, sizeof ird);
 399         strcpy(ird.desired_partnum, partnum);
 400         mime_parser(msg->cm_fields['M'],
 401                 NULL,
 402                 *ical_locate_part,              /* callback function */
 403                 NULL, NULL,
 404                 (void *) &ird,                  /* user data */
 405                 0
 406         );
 407
 408         /* We're done with the incoming message, because we now have a
 409          * calendar object in memory.
 410          */
 411         CtdlFreeMessage(msg);
 412
 413         /*
 414          * Here is the real meat of this function.  Handle the event.
 415          */
 416         if (ird.cal != NULL) {
 417                 /* Save this in the user's calendar if necessary */
 418                 if (!strcasecmp(action, "accept")) {
 419                         ical_add(ird.cal, 0);
 420                 }
 421
 422                 /* Send a reply if necessary */
 423                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 424                         ical_send_a_reply(ird.cal, action);
 425                 }
 426
 427                 /* Now that we've processed this message, we don't need it
 428                  * anymore.  So delete it.
 429                  */
 430                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 431
 432                 /* Free the memory we allocated and return a response. */
 433                 icalcomponent_free(ird.cal);
 434                 ird.cal = NULL;
 435                 cprintf("%d ok\n", CIT_OK);
 436                 return;
 437         }
 438         else {
 439                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 440                 return;
 441         }
 442
 443         /* should never get here */
 444 }
 445
 446
 447 /*
 448  * Figure out the UID of the calendar event being referred to in a
 449  * REPLY object.  This function is recursive.
 450  */
 451 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 452         icalcomponent *subcomponent;
 453         icalproperty *p;
 454
 455         /* If this object is a REPLY, then extract the UID. */
 456         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 457                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 458                 if (p != NULL) {
 459                         strcpy(uidbuf, icalproperty_get_comment(p));
 460                 }
 461         }
 462
 463         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 464          * UID of the reply; we want the UID of the invitation being replied to.
 465          */
 466         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 467             subcomponent != NULL;
 468             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 469                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 470         }
 471 }
 472
 473
 474 /*
 475  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 476  * locate the message containing the calendar event we're replying to, this function
 477  * gets called.  It basically just sticks the message number in a supplied buffer.
 478  */
 479 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 480         long *msgnumptr;
 481
 482         msgnumptr = (long *) data;
 483         *msgnumptr = msgnum;
 484 }
 485
 486
 487 struct original_event_container {
 488         icalcomponent *c;
 489 };
 490
 491 /*
 492  * Callback function for mime parser that hunts for calendar content types
 493  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 494  * to fetch the object being updated)
 495  */
 496 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 497                 void *content, char *cbtype, size_t length, char *encoding,
 498                 void *cbuserdata) {
 499
 500         struct original_event_container *oec = NULL;
 501
 502         if (strcasecmp(cbtype, "text/calendar")) {
 503                 return;
 504         }
 505         oec = (struct original_event_container *) cbuserdata;
 506         if (oec->c != NULL) {
 507                 icalcomponent_free(oec->c);
 508         }
 509         oec->c = icalcomponent_new_from_string(content);
 510 }
 511
 512
 513 /*
 514  * Merge updated attendee information from a REPLY into an existing event.
 515  */
 516 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 517         icalcomponent *c;
 518         icalproperty *e_attendee, *r_attendee;
 519
 520         /* First things first.  If we're not looking at a VEVENT component,
 521          * recurse through subcomponents until we find one.
 522          */
 523         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 524                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 525                     c != NULL;
 526                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 527                         ical_merge_attendee_reply(c, reply);
 528                 }
 529                 return;
 530         }
 531
 532         /* Now do the same thing with the reply.
 533          */
 534         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 535                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 536                     c != NULL;
 537                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 538                         ical_merge_attendee_reply(event, c);
 539                 }
 540                 return;
 541         }
 542
 543         /* Clone the reply, because we're going to rip its guts out. */
 544         reply = icalcomponent_new_clone(reply);
 545
 546         /* At this point we're looking at the correct subcomponents.
 547          * Iterate through the attendees looking for a match.
 548          */
 549 STARTOVER:
 550         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 551             e_attendee != NULL;
 552             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 553
 554                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 555                     r_attendee != NULL;
 556                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 557
 558                         /* Check to see if these two attendees match...
 559                          */
 560                         if (!strcasecmp(
 561                            icalproperty_get_attendee(e_attendee),
 562                            icalproperty_get_attendee(r_attendee)
 563                         )) {
 564                                 /* ...and if they do, remove the attendee from the event
 565                                  * and replace it with the attendee from the reply.  (The
 566                                  * reply's copy will have the same address, but an updated
 567                                  * status.)
 568                                  */
 569                                 TRACE;
 570                                 icalcomponent_remove_property(event, e_attendee);
 571                                 TRACE;
 572                                 icalproperty_free(e_attendee);
 573                                 TRACE;
 574                                 icalcomponent_remove_property(reply, r_attendee);
 575                                 TRACE;
 576                                 icalcomponent_add_property(event, r_attendee);
 577                                 TRACE;
 578
 579                                 /* Since we diddled both sets of attendees, we have to start
 580                                  * the iteration over again.  This will not create an infinite
 581                                  * loop because we removed the attendee from the reply.  (That's
 582                                  * why we cloned the reply, and that's what we mean by "ripping
 583                                  * its guts out.")
 584                                  */
 585                                 goto STARTOVER;
 586                         }
 587
 588                 }
 589         }
 590
 591         /* Free the *clone* of the reply. */
 592         icalcomponent_free(reply);
 593 }
 594
 595
 596
 597
 598 /*
 599  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 600  * calendar event.  The object has already been deserialized for us; all
 601  * we have to do here is hunt for the event in our calendar, merge in the
 602  * updated attendee status, and save it again.
 603  *
 604  * This function returns 0 on success, 1 if the event was not found in the
 605  * user's calendar, or 2 if an internal error occurred.
 606  */
 607 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 608         char uid[SIZ];
 609         char hold_rm[ROOMNAMELEN];
 610         long msgnum_being_replaced = 0;
 611         struct CtdlMessage *template = NULL;
 612         struct CtdlMessage *msg;
 613         struct original_event_container oec;
 614         icalcomponent *original_event;
 615         char *serialized_event = NULL;
 616         char roomname[ROOMNAMELEN];
 617         char *message_text = NULL;
 618
 619         /* Figure out just what event it is we're dealing with */
 620         strcpy(uid, "--==<< InVaLiD uId >>==--");
 621         ical_learn_uid_of_reply(uid, cal);
 622         lprintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 623
 624         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 625
 626         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 627                 getroom(&CC->room, hold_rm);
 628                 lprintf(CTDL_CRIT, "cannot get user calendar room\n");
 629                 return(2);
 630         }
 631
 632         /*
 633          * Pound through the user's calendar looking for a message with
 634          * the Citadel EUID set to the value we're looking for.  Since
 635          * Citadel always sets the message EUID to the vCalendar UID of
 636          * the event, this will work.
 637          */
 638         template = (struct CtdlMessage *)
 639                 malloc(sizeof(struct CtdlMessage));
 640         memset(template, 0, sizeof(struct CtdlMessage));
 641         template->cm_fields['E'] = strdup(uid);
 642         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 643                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 644         CtdlFreeMessage(template);
 645         getroom(&CC->room, hold_rm);    /* return to saved room */
 646
 647         lprintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 648         if (msgnum_being_replaced == 0) {
 649                 return(1);                      /* no calendar event found */
 650         }
 651
 652         /* Now we know the ID of the message containing the event being updated.
 653          * We don't actually have to delete it; that'll get taken care of by the
 654          * server when we save another event with the same UID.  This just gives
 655          * us the ability to load the event into memory so we can diddle the
 656          * attendees.
 657          */
 658         msg = CtdlFetchMessage(msgnum_being_replaced);
 659         if (msg == NULL) {
 660                 return(2);                      /* internal error */
 661         }
 662         oec.c = NULL;
 663         mime_parser(msg->cm_fields['M'],
 664                 NULL,
 665                 *ical_locate_original_event,    /* callback function */
 666                 NULL, NULL,
 667                 &oec,                           /* user data */
 668                 0
 669         );
 670         CtdlFreeMessage(msg);
 671
 672         original_event = oec.c;
 673         if (original_event == NULL) {
 674                 lprintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 675                 return(2);
 676         }
 677
 678         /* Merge the attendee's updated status into the event */
 679         ical_merge_attendee_reply(original_event, cal);
 680
 681         /* Serialize it */
 682         serialized_event = strdup(icalcomponent_as_ical_string(original_event));
 683         icalcomponent_free(original_event);     /* Don't need this anymore. */
 684         if (serialized_event == NULL) return(2);
 685
 686         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 687
 688         message_text = malloc(strlen(serialized_event) + SIZ);
 689         if (message_text != NULL) {
 690                 sprintf(message_text,
 691                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 692                         serialized_event
 693                 );
 694
 695                 msg = CtdlMakeMessage(&CC->user,
 696                         "",                     /* No recipient */
 697                         roomname,
 698                         0, FMT_RFC822,
 699                         "",
 700                         "",             /* no subject */
 701                         message_text);
 702
 703                 if (msg != NULL) {
 704                         CIT_ICAL->avoid_sending_invitations = 1;
 705                         CtdlSubmitMsg(msg, NULL, roomname);
 706                         CtdlFreeMessage(msg);
 707                         CIT_ICAL->avoid_sending_invitations = 0;
 708                 }
 709         }
 710         free(serialized_event);
 711         return(0);
 712 }
 713
 714
 715 /*
 716  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 717  * simply extracts the calendar object from the message, deserializes it, and
 718  * passes it up to ical_update_my_calendar_with_reply() for processing.
 719  */
 720 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 721         struct CtdlMessage *msg;
 722         struct ical_respond_data ird;
 723         int ret;
 724
 725         if (
 726            (strcasecmp(action, "update"))
 727            && (strcasecmp(action, "ignore"))
 728         ) {
 729                 cprintf("%d Action must be 'update' or 'ignore'\n",
 730                         ERROR + ILLEGAL_VALUE
 731                 );
 732                 return;
 733         }
 734
 735         msg = CtdlFetchMessage(msgnum);
 736         if (msg == NULL) {
 737                 cprintf("%d Message %ld not found.\n",
 738                         ERROR + ILLEGAL_VALUE,
 739                         (long)msgnum
 740                 );
 741                 return;
 742         }
 743
 744         memset(&ird, 0, sizeof ird);
 745         strcpy(ird.desired_partnum, partnum);
 746         mime_parser(msg->cm_fields['M'],
 747                 NULL,
 748                 *ical_locate_part,              /* callback function */
 749                 NULL, NULL,
 750                 (void *) &ird,                  /* user data */
 751                 0
 752         );
 753
 754         /* We're done with the incoming message, because we now have a
 755          * calendar object in memory.
 756          */
 757         CtdlFreeMessage(msg);
 758
 759         /*
 760          * Here is the real meat of this function.  Handle the event.
 761          */
 762         if (ird.cal != NULL) {
 763                 /* Update the user's calendar if necessary */
 764                 if (!strcasecmp(action, "update")) {
 765                         ret = ical_update_my_calendar_with_reply(ird.cal);
 766                         if (ret == 0) {
 767                                 cprintf("%d Your calendar has been updated with this reply.\n",
 768                                         CIT_OK);
 769                         }
 770                         else if (ret == 1) {
 771                                 cprintf("%d This event does not exist in your calendar.\n",
 772                                         ERROR + FILE_NOT_FOUND);
 773                         }
 774                         else {
 775                                 cprintf("%d An internal error occurred.\n",
 776                                         ERROR + INTERNAL_ERROR);
 777                         }
 778                 }
 779                 else {
 780                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 781                 }
 782
 783                 /* Now that we've processed this message, we don't need it
 784                  * anymore.  So delete it.  (Maybe make this optional?)
 785                  */
 786                 CtdlDeleteMessages(CC->room.QRname, msgnum, "");
 787
 788                 /* Free the memory we allocated and return a response. */
 789                 icalcomponent_free(ird.cal);
 790                 ird.cal = NULL;
 791                 return;
 792         }
 793         else {
 794                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 795                 return;
 796         }
 797
 798         /* should never get here */
 799 }
 800
 801
 802 /*
 803  * Search for a property in both the top level and in a VEVENT subcomponent
 804  */
 805 icalproperty *ical_ctdl_get_subprop(
 806                 icalcomponent *cal,
 807                 icalproperty_kind which_prop
 808 ) {
 809         icalproperty *p;
 810         icalcomponent *c;
 811
 812         p = icalcomponent_get_first_property(cal, which_prop);
 813         if (p == NULL) {
 814                 c = icalcomponent_get_first_component(cal,
 815                                                         ICAL_VEVENT_COMPONENT);
 816                 if (c != NULL) {
 817                         p = icalcomponent_get_first_property(c, which_prop);
 818                 }
 819         }
 820         return p;
 821 }
 822
 823
 824 /*
 825  * Check to see if two events overlap.  Returns nonzero if they do.
 826  * (This function is used in both Citadel and WebCit.  If you change it in
 827  * one place, change it in the other.  Better yet, put it in a library.)
 828  */
 829 int ical_ctdl_is_overlap(
 830                         struct icaltimetype t1start,
 831                         struct icaltimetype t1end,
 832                         struct icaltimetype t2start,
 833                         struct icaltimetype t2end
 834 ) {
 835
 836         if (icaltime_is_null_time(t1start)) return(0);
 837         if (icaltime_is_null_time(t2start)) return(0);
 838
 839         /* First, check for all-day events */
 840         if (t1start.is_date) {
 841                 if (!icaltime_compare_date_only(t1start, t2start)) {
 842                         return(1);
 843                 }
 844                 if (!icaltime_is_null_time(t2end)) {
 845                         if (!icaltime_compare_date_only(t1start, t2end)) {
 846                                 return(1);
 847                         }
 848                 }
 849         }
 850
 851         if (t2start.is_date) {
 852                 if (!icaltime_compare_date_only(t2start, t1start)) {
 853                         return(1);
 854                 }
 855                 if (!icaltime_is_null_time(t1end)) {
 856                         if (!icaltime_compare_date_only(t2start, t1end)) {
 857                                 return(1);
 858                         }
 859                 }
 860         }
 861
 862         /* Now check for overlaps using date *and* time. */
 863
 864         /* First, bail out if either event 1 or event 2 is missing end time. */
 865         if (icaltime_is_null_time(t1end)) return(0);
 866         if (icaltime_is_null_time(t2end)) return(0);
 867
 868         /* If event 1 ends before event 2 starts, we're in the clear. */
 869         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 870
 871         /* If event 2 ends before event 1 starts, we're also ok. */
 872         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 873
 874         /* Otherwise, they overlap. */
 875         return(1);
 876 }
 877
 878
 879
 880 /*
 881  * Backend for ical_hunt_for_conflicts()
 882  */
 883 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 884         icalcomponent *cal;
 885         struct CtdlMessage *msg;
 886         struct ical_respond_data ird;
 887         struct icaltimetype t1start, t1end, t2start, t2end;
 888         icalproperty *p;
 889         char conflict_event_uid[SIZ];
 890         char conflict_event_summary[SIZ];
 891         char compare_uid[SIZ];
 892
 893         cal = (icalcomponent *)data;
 894         strcpy(compare_uid, "");
 895         strcpy(conflict_event_uid, "");
 896         strcpy(conflict_event_summary, "");
 897
 898         msg = CtdlFetchMessage(msgnum);
 899         if (msg == NULL) return;
 900         memset(&ird, 0, sizeof ird);
 901         strcpy(ird.desired_partnum, "_HUNT_");
 902         mime_parser(msg->cm_fields['M'],
 903                 NULL,
 904                 *ical_locate_part,              /* callback function */
 905                 NULL, NULL,
 906                 (void *) &ird,                  /* user data */
 907                 0
 908         );
 909         CtdlFreeMessage(msg);
 910
 911         if (ird.cal == NULL) return;
 912
 913         t1start = icaltime_null_time();
 914         t1end = icaltime_null_time();
 915         t2start = icaltime_null_time();
 916         t1end = icaltime_null_time();
 917
 918         /* Now compare cal to ird.cal */
 919         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 920         if (p == NULL) return;
 921         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 922
 923         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 924         if (p != NULL) t2end = icalproperty_get_dtend(p);
 925
 926         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 927         if (p == NULL) return;
 928         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 929
 930         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 931         if (p != NULL) t1end = icalproperty_get_dtend(p);
 932
 933         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 934         if (p != NULL) {
 935                 strcpy(compare_uid, icalproperty_get_comment(p));
 936         }
 937
 938         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 939         if (p != NULL) {
 940                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 941         }
 942
 943         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 944         if (p != NULL) {
 945                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 946         }
 947
 948         icalcomponent_free(ird.cal);
 949
 950         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 951                 cprintf("%ld||%s|%s|%d|\n",
 952                         msgnum,
 953                         conflict_event_uid,
 954                         conflict_event_summary,
 955                         (       ((strlen(compare_uid)>0)
 956                                 &&(!strcasecmp(compare_uid,
 957                                 conflict_event_uid))) ? 1 : 0
 958                         )
 959                 );
 960         }
 961 }
 962
 963
 964
 965 /*
 966  * Phase 2 of "hunt for conflicts" operation.
 967  * At this point we have a calendar object which represents the VEVENT that
 968  * we're considering adding to the calendar.  Now hunt through the user's
 969  * calendar room, and output zero or more existing VEVENTs which conflict
 970  * with this one.
 971  */
 972 void ical_hunt_for_conflicts(icalcomponent *cal) {
 973         char hold_rm[ROOMNAMELEN];
 974
 975         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 976
 977         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 978                 getroom(&CC->room, hold_rm);
 979                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
 980                 return;
 981         }
 982
 983         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 984
 985         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 986                 NULL,
 987                 ical_hunt_for_conflicts_backend,
 988                 (void *) cal
 989         );
 990
 991         cprintf("000\n");
 992         getroom(&CC->room, hold_rm);    /* return to saved room */
 993
 994 }
 995
 996
 997
 998 /*
 999  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1000  */
1001 void ical_conflicts(long msgnum, char *partnum) {
1002         struct CtdlMessage *msg;
1003         struct ical_respond_data ird;
1004
1005         msg = CtdlFetchMessage(msgnum);
1006         if (msg == NULL) {
1007                 cprintf("%d Message %ld not found.\n",
1008                         ERROR + ILLEGAL_VALUE,
1009                         (long)msgnum
1010                 );
1011                 return;
1012         }
1013
1014         memset(&ird, 0, sizeof ird);
1015         strcpy(ird.desired_partnum, partnum);
1016         mime_parser(msg->cm_fields['M'],
1017                 NULL,
1018                 *ical_locate_part,              /* callback function */
1019                 NULL, NULL,
1020                 (void *) &ird,                  /* user data */
1021                 0
1022         );
1023
1024         CtdlFreeMessage(msg);
1025
1026         if (ird.cal != NULL) {
1027                 ical_hunt_for_conflicts(ird.cal);
1028                 icalcomponent_free(ird.cal);
1029                 return;
1030         }
1031         else {
1032                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1033                 return;
1034         }
1035
1036         /* should never get here */
1037 }
1038
1039
1040
1041 /*
1042  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1043  */
1044 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1045         icalproperty *p;
1046         icalvalue *v;
1047         struct icalperiodtype my_period;
1048
1049         if (cal == NULL) return;
1050         my_period = icalperiodtype_null_period();
1051
1052         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1053                 ical_add_to_freebusy(fb,
1054                         icalcomponent_get_first_component(
1055                                 cal, ICAL_VEVENT_COMPONENT
1056                         )
1057                 );
1058                 return;
1059         }
1060
1061         ical_dezonify(cal);
1062
1063         /* If this event is not opaque, the user isn't publishing it as
1064          * busy time, so don't bother doing anything else.
1065          */
1066         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1067         if (p != NULL) {
1068                 v = icalproperty_get_value(p);
1069                 if (v != NULL) {
1070                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1071                                 return;
1072                         }
1073                 }
1074         }
1075
1076         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1077         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1078         if (p != NULL) {
1079                 my_period.start = icalproperty_get_dtstart(p);
1080         }
1081
1082         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1083         if (p != NULL) {
1084                 my_period.end = icalproperty_get_dtstart(p);
1085         }
1086
1087         /* Now add it. */
1088         icalcomponent_add_property(fb,
1089                 icalproperty_new_freebusy(my_period)
1090         );
1091
1092 }
1093
1094
1095
1096 /*
1097  * Backend for ical_freebusy()
1098  *
1099  * This function simply loads the messages in the user's calendar room,
1100  * which contain VEVENTs, then strips them of all non-freebusy data, and
1101  * adds them to the supplied VCALENDAR.
1102  *
1103  */
1104 void ical_freebusy_backend(long msgnum, void *data) {
1105         icalcomponent *cal;
1106         struct CtdlMessage *msg;
1107         struct ical_respond_data ird;
1108
1109         cal = (icalcomponent *)data;
1110
1111         msg = CtdlFetchMessage(msgnum);
1112         if (msg == NULL) return;
1113         memset(&ird, 0, sizeof ird);
1114         strcpy(ird.desired_partnum, "_HUNT_");
1115         mime_parser(msg->cm_fields['M'],
1116                 NULL,
1117                 *ical_locate_part,              /* callback function */
1118                 NULL, NULL,
1119                 (void *) &ird,                  /* user data */
1120                 0
1121         );
1122         CtdlFreeMessage(msg);
1123
1124         if (ird.cal == NULL) return;
1125
1126         ical_add_to_freebusy(cal, ird.cal);
1127
1128         /* Now free the memory. */
1129         icalcomponent_free(ird.cal);
1130 }
1131
1132
1133
1134 /*
1135  * Grab another user's free/busy times
1136  */
1137 void ical_freebusy(char *who) {
1138         struct ctdluser usbuf;
1139         char calendar_room_name[ROOMNAMELEN];
1140         char hold_rm[ROOMNAMELEN];
1141         char *serialized_request = NULL;
1142         icalcomponent *encaps = NULL;
1143         icalcomponent *fb = NULL;
1144
1145         if (getuser(&usbuf, who) != 0) {
1146                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1147                 return;
1148         }
1149
1150         MailboxName(calendar_room_name, sizeof calendar_room_name,
1151                 &usbuf, USERCALENDARROOM);
1152
1153         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1154
1155         if (getroom(&CC->room, calendar_room_name) != 0) {
1156                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1157                 getroom(&CC->room, hold_rm);
1158                 return;
1159         }
1160
1161         /* Create a VFREEBUSY subcomponent */
1162         lprintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1163         fb = icalcomponent_new_vfreebusy();
1164         if (fb == NULL) {
1165                 cprintf("%d Internal error: cannot allocate memory.\n",
1166                         ERROR + INTERNAL_ERROR);
1167                 icalcomponent_free(encaps);
1168                 getroom(&CC->room, hold_rm);
1169                 return;
1170         }
1171
1172         lprintf(CTDL_DEBUG, "Adding busy time from events\n");
1173         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
1174                 NULL, ical_freebusy_backend, (void *)fb
1175         );
1176
1177         /* Set the method to PUBLISH */
1178         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1179
1180         /* Set the DTSTAMP to right now. */
1181         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1182
1183         /* FIXME we still need (at least) DTSTART, DTEND, and the user's
1184          * e-mail address as ORGANIZER.
1185          */
1186
1187         /* Put the freebusy component into the calendar component */
1188         lprintf(CTDL_DEBUG, "Encapsulating\n");
1189         encaps = ical_encapsulate_subcomponent(fb);
1190         if (encaps == NULL) {
1191                 icalcomponent_free(fb);
1192                 cprintf("%d Internal error: cannot allocate memory.\n",
1193                         ERROR + INTERNAL_ERROR);
1194                 getroom(&CC->room, hold_rm);
1195                 return;
1196         }
1197
1198         /* Set the method to PUBLISH */
1199         lprintf(CTDL_DEBUG, "Setting method\n");
1200         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1201
1202         /* Serialize it */
1203         lprintf(CTDL_DEBUG, "Serializing\n");
1204         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1205         icalcomponent_free(encaps);     /* Don't need this anymore. */
1206
1207         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1208         if (serialized_request != NULL) {
1209                 client_write(serialized_request, strlen(serialized_request));
1210                 free(serialized_request);
1211         }
1212         cprintf("\n000\n");
1213
1214         /* Go back to the room from which we came... */
1215         getroom(&CC->room, hold_rm);
1216 }
1217
1218
1219
1220
1221 /*
1222  * All Citadel calendar commands from the client come through here.
1223  */
1224 void cmd_ical(char *argbuf)
1225 {
1226         char subcmd[SIZ];
1227         long msgnum;
1228         char partnum[SIZ];
1229         char action[SIZ];
1230         char who[SIZ];
1231
1232         extract(subcmd, argbuf, 0);
1233
1234         /* Allow "test" and "freebusy" subcommands without logging in. */
1235
1236         if (!strcasecmp(subcmd, "test")) {
1237                 cprintf("%d This server supports calendaring\n", CIT_OK);
1238                 return;
1239         }
1240
1241         if (!strcasecmp(subcmd, "freebusy")) {
1242                 extract(who, argbuf, 1);
1243                 ical_freebusy(who);
1244                 return;
1245         }
1246
1247         if (!strcasecmp(subcmd, "sgi")) {
1248                 CIT_ICAL->server_generated_invitations =
1249                         (extract_int(argbuf, 1) ? 1 : 0) ;
1250                 cprintf("%d %d\n",
1251                         CIT_OK, CIT_ICAL->server_generated_invitations);
1252                 return;
1253         }
1254
1255         if (CtdlAccessCheck(ac_logged_in)) return;
1256
1257         if (!strcasecmp(subcmd, "respond")) {
1258                 msgnum = extract_long(argbuf, 1);
1259                 extract(partnum, argbuf, 2);
1260                 extract(action, argbuf, 3);
1261                 ical_respond(msgnum, partnum, action);
1262                 return;
1263         }
1264
1265         if (!strcasecmp(subcmd, "handle_rsvp")) {
1266                 msgnum = extract_long(argbuf, 1);
1267                 extract(partnum, argbuf, 2);
1268                 extract(action, argbuf, 3);
1269                 ical_handle_rsvp(msgnum, partnum, action);
1270                 return;
1271         }
1272
1273         if (!strcasecmp(subcmd, "conflicts")) {
1274                 msgnum = extract_long(argbuf, 1);
1275                 extract(partnum, argbuf, 2);
1276                 ical_conflicts(msgnum, partnum);
1277                 return;
1278         }
1279
1280         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1281 }
1282
1283
1284
1285 /*
1286  * We don't know if the calendar room exists so we just create it at login
1287  */
1288 void ical_create_room(void)
1289 {
1290         struct ctdlroom qr;
1291         struct visit vbuf;
1292
1293         /* Create the calendar room if it doesn't already exist */
1294         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
1295
1296         /* Set expiration policy to manual; otherwise objects will be lost! */
1297         if (lgetroom(&qr, USERCALENDARROOM)) {
1298                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1299                 return;
1300         }
1301         qr.QRep.expire_mode = EXPIRE_MANUAL;
1302         qr.QRdefaultview = 3;   /* 3 = calendar view */
1303         lputroom(&qr);
1304
1305         /* Set the view to a calendar view */
1306         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1307         vbuf.v_view = 3;        /* 3 = calendar */
1308         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1309
1310         /* Create the tasks list room if it doesn't already exist */
1311         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
1312
1313         /* Set expiration policy to manual; otherwise objects will be lost! */
1314         if (lgetroom(&qr, USERTASKSROOM)) {
1315                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1316                 return;
1317         }
1318         qr.QRep.expire_mode = EXPIRE_MANUAL;
1319         qr.QRdefaultview = 4;   /* 4 = tasks view */
1320         lputroom(&qr);
1321
1322         /* Set the view to a task list view */
1323         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1324         vbuf.v_view = 4;        /* 4 = tasks */
1325         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1326
1327         return;
1328 }
1329
1330
1331 /*
1332  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1333  * finds a VEVENT.
1334  */
1335 void ical_send_out_invitations(icalcomponent *cal) {
1336         icalcomponent *the_request = NULL;
1337         char *serialized_request = NULL;
1338         icalcomponent *encaps = NULL;
1339         char *request_message_text = NULL;
1340         struct CtdlMessage *msg = NULL;
1341         struct recptypes *valid = NULL;
1342         char attendees_string[SIZ];
1343         int num_attendees = 0;
1344         char this_attendee[SIZ];
1345         icalproperty *attendee = NULL;
1346         char summary_string[SIZ];
1347         icalproperty *summary = NULL;
1348
1349         if (cal == NULL) {
1350                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1351                 return;
1352         }
1353
1354
1355         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1356         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1357                 ical_send_out_invitations(
1358                         icalcomponent_get_first_component(
1359                                 cal, ICAL_VEVENT_COMPONENT
1360                         )
1361                 );
1362                 return;
1363         }
1364
1365         /* Clone the event */
1366         the_request = icalcomponent_new_clone(cal);
1367         if (the_request == NULL) {
1368                 lprintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1369                 return;
1370         }
1371
1372         /* Extract the summary string -- we'll use it as the
1373          * message subject for the request
1374          */
1375         strcpy(summary_string, "Meeting request");
1376         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1377         if (summary != NULL) {
1378                 if (icalproperty_get_summary(summary)) {
1379                         strcpy(summary_string,
1380                                 icalproperty_get_summary(summary) );
1381                 }
1382         }
1383
1384         /* Determine who the recipients of this message are (the attendees) */
1385         strcpy(attendees_string, "");
1386         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1387                 if (icalproperty_get_attendee(attendee)) {
1388                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
1389                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1390                                 strcpy(this_attendee, &this_attendee[7]);
1391
1392                                 if (!CtdlIsMe(this_attendee)) { /* don't send an invitation to myself! */
1393                                         snprintf(&attendees_string[strlen(attendees_string)],
1394                                                 sizeof(attendees_string) - strlen(attendees_string),
1395                                                 "%s, ",
1396                                                 this_attendee
1397                                         );
1398                                         ++num_attendees;
1399                                 }
1400                         }
1401                 }
1402         }
1403
1404         lprintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1405
1406         /* If there are no attendees, there are no invitations to send, so...
1407          * don't bother putting one together!  Punch out, Maverick!
1408          */
1409         if (num_attendees == 0) {
1410                 icalcomponent_free(the_request);
1411                 return;
1412         }
1413
1414         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1415         encaps = icalcomponent_new_vcalendar();
1416         if (encaps == NULL) {
1417                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1418                         __FILE__, __LINE__);
1419                 icalcomponent_free(the_request);
1420                 return;
1421         }
1422
1423         /* Set the Product ID */
1424         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1425
1426         /* Set the Version Number */
1427         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1428
1429         /* Set the method to REQUEST */
1430         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1431
1432         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1433         ical_dezonify(the_request);
1434
1435         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1436          * are responsible for "the_request"'s memory -- it will be freed
1437          * when we free "encaps".
1438          */
1439         icalcomponent_add_component(encaps, the_request);
1440
1441         /* Serialize it */
1442         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1443         icalcomponent_free(encaps);     /* Don't need this anymore. */
1444         if (serialized_request == NULL) return;
1445
1446         request_message_text = malloc(strlen(serialized_request) + SIZ);
1447         if (request_message_text != NULL) {
1448                 sprintf(request_message_text,
1449                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1450                         serialized_request
1451                 );
1452
1453                 msg = CtdlMakeMessage(&CC->user,
1454                         "",                     /* No single recipient here */
1455                         CC->room.QRname, 0, FMT_RFC822,
1456                         "",
1457                         summary_string,         /* Use summary for subject */
1458                         request_message_text);
1459
1460                 if (msg != NULL) {
1461                         valid = validate_recipients(attendees_string);
1462                         CtdlSubmitMsg(msg, valid, "");
1463                         CtdlFreeMessage(msg);
1464                 }
1465         }
1466         free(serialized_request);
1467 }
1468
1469
1470 /*
1471  * When a calendar object is being saved, determine whether it's a VEVENT
1472  * and the user saving it is the organizer.  If so, send out invitations
1473  * to any listed attendees.
1474  *
1475  */
1476 void ical_saving_vevent(icalcomponent *cal) {
1477         icalcomponent *c;
1478         icalproperty *organizer = NULL;
1479         char organizer_string[SIZ];
1480
1481         /* Don't send out invitations unless the client wants us to. */
1482         if (CIT_ICAL->server_generated_invitations == 0) {
1483                 return;
1484         }
1485
1486         /* Don't send out invitations if we've been asked not to. */
1487         if (CIT_ICAL->avoid_sending_invitations > 0) {
1488                 return;
1489         }
1490
1491         strcpy(organizer_string, "");
1492         /*
1493          * The VEVENT subcomponent is the one we're interested in.
1494          * Send out invitations if, and only if, this user is the Organizer.
1495          */
1496         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1497                 organizer = icalcomponent_get_first_property(cal,
1498                                                 ICAL_ORGANIZER_PROPERTY);
1499                 if (organizer != NULL) {
1500                         if (icalproperty_get_organizer(organizer)) {
1501                                 strcpy(organizer_string,
1502                                         icalproperty_get_organizer(organizer));
1503                         }
1504                 }
1505                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1506                         strcpy(organizer_string, &organizer_string[7]);
1507                         striplt(organizer_string);
1508                         /*
1509                          * If the user saving the event is listed as the
1510                          * organizer, then send out invitations.
1511                          */
1512                         if (CtdlIsMe(organizer_string)) {
1513                                 ical_send_out_invitations(cal);
1514                         }
1515                 }
1516         }
1517
1518         /* If the component has subcomponents, recurse through them. */
1519         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1520             (c != NULL);
1521             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1522                 /* Recursively process subcomponent */
1523                 ical_saving_vevent(c);
1524         }
1525
1526 }
1527
1528
1529
1530 /*
1531  * Back end for ical_obj_beforesave()
1532  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1533  * the summary of the event (becomes message subject),
1534  * and the start time (becomes message date/time).
1535  */
1536 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1537                 char *disp, void *content, char *cbtype, size_t length,
1538                 char *encoding, void *cbuserdata)
1539 {
1540         icalcomponent *cal;
1541         icalproperty *p;
1542         struct icalmessagemod *imm;
1543
1544         imm = (struct icalmessagemod *)cbuserdata;
1545
1546         /* If this is a text/calendar object, hunt for the UID and drop it in
1547          * the "user data" pointer for the MIME parser.  When
1548          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1549          * to that string.
1550          */
1551         if (!strcasecmp(cbtype, "text/calendar")) {
1552                 cal = icalcomponent_new_from_string(content);
1553                 if (cal != NULL) {
1554                         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1555                                 cal = icalcomponent_get_first_component(
1556                                         cal, ICAL_VEVENT_COMPONENT
1557                                 );
1558                         }
1559                 }
1560                 if (cal != NULL) {
1561                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1562                         if (p != NULL) {
1563                                 strcpy(imm->uid, icalproperty_get_comment(p));
1564                         }
1565                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1566                         if (p != NULL) {
1567                                 strcpy(imm->subject,
1568                                                 icalproperty_get_comment(p));
1569                         }
1570                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1571                         if (p != NULL) {
1572                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1573                         }
1574                         icalcomponent_free(cal);
1575                 }
1576         }
1577 }
1578
1579
1580
1581
1582
1583 /*
1584  * See if we need to prevent the object from being saved (we don't allow
1585  * MIME types other than text/calendar in the Calendar> room).  Also, when
1586  * saving an event to the calendar, set the message's Citadel extended message
1587  * ID to the UID of the object.  This causes our replication checker to
1588  * automatically delete any existing instances of the same object.  (Isn't
1589  * that cool?)
1590  *
1591  * We also set the message's Subject to the event summary, and the Date/time to
1592  * the event start time.
1593  */
1594 int ical_obj_beforesave(struct CtdlMessage *msg)
1595 {
1596         char roomname[ROOMNAMELEN];
1597         char *p;
1598         int a;
1599         struct icalmessagemod imm;
1600
1601         /*
1602          * Only messages with content-type text/calendar
1603          * may be saved to Calendar>.  If the message is bound for
1604          * Calendar> but doesn't have this content-type, throw an error
1605          * so that the message may not be posted.
1606          */
1607
1608         /* First determine if this is our room */
1609         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1610         if (strcasecmp(roomname, CC->room.QRname)) {
1611                 return 0;       /* It's not the Calendar room. */
1612         }
1613
1614         /* Then determine content-type of the message */
1615
1616         /* It must be an RFC822 message! */
1617         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1618         if (msg->cm_format_type != 4)
1619                 return 1;       /* You tried to save a non-RFC822 message! */
1620
1621         /* Find the Content-Type: header */
1622         p = msg->cm_fields['M'];
1623         a = strlen(p);
1624         while (--a > 0) {
1625                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1626                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1627                                 memset(&imm, 0, sizeof(struct icalmessagemod));
1628                                 mime_parser(msg->cm_fields['M'],
1629                                         NULL,
1630                                         *ical_ctdl_set_extended_msgid,
1631                                         NULL, NULL,
1632                                         (void *)&imm,
1633                                         0
1634                                 );
1635                                 if (strlen(imm.uid) > 0) {
1636                                         if (msg->cm_fields['E'] != NULL) {
1637                                                 free(msg->cm_fields['E']);
1638                                         }
1639                                         msg->cm_fields['E'] = strdup(imm.uid);
1640                                 }
1641                                 if (strlen(imm.subject) > 0) {
1642                                         if (msg->cm_fields['U'] != NULL) {
1643                                                 free(msg->cm_fields['U']);
1644                                         }
1645                                         msg->cm_fields['U'] = strdup(imm.subject);
1646                                 }
1647                                 if (imm.dtstart > 0) {
1648                                         if (msg->cm_fields['T'] != NULL) {
1649                                                 free(msg->cm_fields['T']);
1650                                         }
1651                                         msg->cm_fields['T'] = strdup("000000000000000000");
1652                                         sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
1653                                 }
1654                                 return 0;
1655                         }
1656                         else {
1657                                 return 1;
1658                         }
1659                 }
1660                 p++;
1661         }
1662
1663         /* Oops!  No Content-Type in this message!  How'd that happen? */
1664         lprintf(CTDL_ERR, "RFC822 message with no Content-Type header!\n");
1665         return 1;
1666 }
1667
1668
1669 /*
1670  * Things we need to do after saving a calendar event.
1671  */
1672 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1673                 char *disp, void *content, char *cbtype, size_t length,
1674                 char *encoding, void *cbuserdata)
1675 {
1676         icalcomponent *cal;
1677
1678         /* If this is a text/calendar object, hunt for the UID and drop it in
1679          * the "user data" pointer for the MIME parser.  When
1680          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1681          * to that string.
1682          */
1683         if (!strcasecmp(cbtype, "text/calendar")) {
1684                 cal = icalcomponent_new_from_string(content);
1685                 if (cal != NULL) {
1686                         ical_saving_vevent(cal);
1687                         icalcomponent_free(cal);
1688                 }
1689         }
1690 }
1691
1692
1693 /*
1694  * Things we need to do after saving a calendar event.
1695  */
1696 int ical_obj_aftersave(struct CtdlMessage *msg)
1697 {
1698         char roomname[ROOMNAMELEN];
1699         char *p;
1700         int a;
1701
1702         /*
1703          * If this isn't the Calendar> room, no further action is necessary.
1704          */
1705
1706         /* First determine if this is our room */
1707         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
1708         if (strcasecmp(roomname, CC->room.QRname)) {
1709                 return 0;       /* It's not the Calendar room. */
1710         }
1711
1712         /* Then determine content-type of the message */
1713
1714         /* It must be an RFC822 message! */
1715         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1716         if (msg->cm_format_type != 4) return(1);
1717
1718         /* Find the Content-Type: header */
1719         p = msg->cm_fields['M'];
1720         a = strlen(p);
1721         while (--a > 0) {
1722                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1723                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1724                                 mime_parser(msg->cm_fields['M'],
1725                                         NULL,
1726                                         *ical_obj_aftersave_backend,
1727                                         NULL, NULL,
1728                                         NULL,
1729                                         0
1730                                 );
1731                                 return 0;
1732                         }
1733                         else {
1734                                 return 1;
1735                         }
1736                 }
1737                 p++;
1738         }
1739
1740         /* Oops!  No Content-Type in this message!  How'd that happen? */
1741         lprintf(CTDL_ERR, "RFC822 message with no Content-Type header!\n");
1742         return 1;
1743 }
1744
1745
1746 void ical_session_startup(void) {
1747         CtdlAllocUserData(SYM_CIT_ICAL, sizeof(struct cit_ical));
1748         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
1749 }
1750
1751
1752 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
1753
1754 /*
1755  * Register this module with the Citadel server.
1756  */
1757 char *serv_calendar_init(void)
1758 {
1759 #ifdef CITADEL_WITH_CALENDAR_SERVICE
1760         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1761         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1762         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1763         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1764         CtdlRegisterSessionHook(ical_session_startup, EVT_START);
1765 #endif
1766         return "$Id$";
1767 }