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 "serv_calendar.h"
  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 "dynloader.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
  35 #ifdef HAVE_ICAL_H
  36
  37 #include <ical.h>
  38
  39 struct ical_respond_data {
  40         char desired_partnum[SIZ];
  41         icalcomponent *cal;
  42 };
  43
  44
  45 /*
  46  * Write a calendar object into the specified user's calendar room.
  47  */
  48 void ical_write_to_cal(struct usersupp *u, icalcomponent *cal) {
  49         char temp[PATH_MAX];
  50         FILE *fp;
  51         char *ser;
  52
  53         strcpy(temp, tmpnam(NULL));
  54         ser = icalcomponent_as_ical_string(cal);
  55         if (ser == NULL) return;
  56
  57         /* Make a temp file out of it */
  58         fp = fopen(temp, "w");
  59         if (fp == NULL) return;
  60         fwrite(ser, strlen(ser), 1, fp);
  61         fclose(fp);
  62
  63         /* This handy API function does all the work for us.
  64          */
  65         CtdlWriteObject(USERCALENDARROOM,       /* which room */
  66                         "text/calendar",        /* MIME type */
  67                         temp,                   /* temp file */
  68                         u,                      /* which user */
  69                         0,                      /* not binary */
  70                         0,              /* don't delete others of this type */
  71                         0);                     /* no flags */
  72
  73         unlink(temp);
  74 }
  75
  76
  77 /*
  78  * Add a calendar object to the user's calendar
  79  */
  80 void ical_add(icalcomponent *cal, int recursion_level) {
  81         icalcomponent *c;
  82
  83         /*
  84          * The VEVENT subcomponent is the one we're interested in saving.
  85          */
  86         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
  87
  88                 ical_write_to_cal(&CC->usersupp, cal);
  89
  90         }
  91
  92         /* If the component has subcomponents, recurse through them. */
  93         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
  94             (c != 0);
  95             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
  96                 /* Recursively process subcomponent */
  97                 ical_add(c, recursion_level+1);
  98         }
  99
 100 }
 101
 102
 103
 104 /*
 105  * Send a reply to a meeting invitation.
 106  *
 107  * 'request' is the invitation to reply to.
 108  * 'action' is the string "accept" or "decline".
 109  *
 110  * (Sorry about this being more than 80 columns ... there was just
 111  * no easy way to break it down sensibly.)
 112  */
 113 void ical_send_a_reply(icalcomponent *request, char *action) {
 114         icalcomponent *the_reply = NULL;
 115         icalcomponent *vevent = NULL;
 116         icalproperty *attendee = NULL;
 117         char attendee_string[SIZ];
 118         icalproperty *organizer = NULL;
 119         char organizer_string[SIZ];
 120         icalproperty *summary = NULL;
 121         char summary_string[SIZ];
 122         icalproperty *me_attend = NULL;
 123         struct recptypes *recp = NULL;
 124         icalparameter *partstat = NULL;
 125         char *serialized_reply = NULL;
 126         char *reply_message_text = NULL;
 127         struct CtdlMessage *msg = NULL;
 128         struct recptypes *valid = NULL;
 129
 130         strcpy(organizer_string, "");
 131         strcpy(summary_string, "Calendar item");
 132
 133         if (request == NULL) {
 134                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 135                 return;
 136         }
 137
 138         the_reply = icalcomponent_new_clone(request);
 139         if (the_reply == NULL) {
 140                 lprintf(3, "ERROR: cannot clone request\n");
 141                 return;
 142         }
 143
 144         /* Change the method from REQUEST to REPLY */
 145         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 146
 147         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 148         if (vevent != NULL) {
 149                 /* Hunt for attendees, removing ones that aren't us.
 150                  * (Actually, remove them all, cloning our own one so we can
 151                  * re-insert it later)
 152                  */
 153                 while (attendee = icalcomponent_get_first_property(vevent,
 154                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 155                 ) {
 156                         if (icalproperty_get_attendee(attendee)) {
 157                                 strcpy(attendee_string,
 158                                         icalproperty_get_attendee(attendee) );
 159                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 160                                         strcpy(attendee_string, &attendee_string[7]);
 161                                         striplt(attendee_string);
 162                                         recp = validate_recipients(attendee_string);
 163                                         if (recp != NULL) {
 164                                                 if (!strcasecmp(recp->recp_local, CC->usersupp.fullname)) {
 165                                                         if (me_attend) icalproperty_free(me_attend);
 166                                                         me_attend = icalproperty_new_clone(attendee);
 167                                                 }
 168                                                 phree(recp);
 169                                         }
 170                                 }
 171                         }
 172                         /* Remove it... */
 173                         icalcomponent_remove_property(vevent, attendee);
 174                         icalproperty_free(attendee);
 175                 }
 176
 177                 /* We found our own address in the attendee list. */
 178                 if (me_attend) {
 179                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 180                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 181
 182                         if (!strcasecmp(action, "accept")) {
 183                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 184                         }
 185                         else if (!strcasecmp(action, "decline")) {
 186                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 187                         }
 188                         else if (!strcasecmp(action, "tentative")) {
 189                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 190                         }
 191
 192                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 193
 194                         /* Now insert it back into the vevent. */
 195                         icalcomponent_add_property(vevent, me_attend);
 196                 }
 197
 198                 /* Figure out who to send this thing to */
 199                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 200                 if (organizer != NULL) {
 201                         if (icalproperty_get_organizer(organizer)) {
 202                                 strcpy(organizer_string,
 203                                         icalproperty_get_organizer(organizer) );
 204                         }
 205                 }
 206                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 207                         strcpy(organizer_string, &organizer_string[7]);
 208                         striplt(organizer_string);
 209                 } else {
 210                         strcpy(organizer_string, "");
 211                 }
 212
 213                 /* Extract the summary string -- we'll use it as the
 214                  * message subject for the reply
 215                  */
 216                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 217                 if (summary != NULL) {
 218                         if (icalproperty_get_summary(summary)) {
 219                                 strcpy(summary_string,
 220                                         icalproperty_get_summary(summary) );
 221                         }
 222                 }
 223
 224         }
 225
 226         /* Now generate the reply message and send it out. */
 227         serialized_reply = strdoop(icalcomponent_as_ical_string(the_reply));
 228         icalcomponent_free(the_reply);  /* don't need this anymore */
 229         if (serialized_reply == NULL) return;
 230
 231         reply_message_text = mallok(strlen(serialized_reply) + SIZ);
 232         if (reply_message_text != NULL) {
 233                 sprintf(reply_message_text,
 234                         "Content-type: text/calendar\r\n\r\n%s\r\n",
 235                         serialized_reply
 236                 );
 237
 238                 msg = CtdlMakeMessage(&CC->usersupp, organizer_string,
 239                         CC->quickroom.QRname, 0, FMT_RFC822,
 240                         "",
 241                         summary_string,         /* Use summary for subject */
 242                         reply_message_text);
 243
 244                 if (msg != NULL) {
 245                         valid = validate_recipients(organizer_string);
 246                         CtdlSubmitMsg(msg, valid, "");
 247                         CtdlFreeMessage(msg);
 248                 }
 249         }
 250         phree(serialized_reply);
 251 }
 252
 253
 254
 255 /*
 256  * Callback function for mime parser that hunts for calendar content types
 257  * and turns them into calendar objects
 258  */
 259 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 260                 void *content, char *cbtype, size_t length, char *encoding,
 261                 void *cbuserdata) {
 262
 263         struct ical_respond_data *ird = NULL;
 264
 265         ird = (struct ical_respond_data *) cbuserdata;
 266         if (ird->cal != NULL) {
 267                 icalcomponent_free(ird->cal);
 268                 ird->cal = NULL;
 269         }
 270         if (strcasecmp(partnum, ird->desired_partnum)) return;
 271         ird->cal = icalcomponent_new_from_string(content);
 272 }
 273
 274
 275 /*
 276  * Respond to a meeting request.
 277  */
 278 void ical_respond(long msgnum, char *partnum, char *action) {
 279         struct CtdlMessage *msg;
 280         struct ical_respond_data ird;
 281
 282         if (
 283            (strcasecmp(action, "accept"))
 284            && (strcasecmp(action, "decline"))
 285         ) {
 286                 cprintf("%d Action must be 'accept' or 'decline'\n",
 287                         ERROR + ILLEGAL_VALUE
 288                 );
 289                 return;
 290         }
 291
 292         msg = CtdlFetchMessage(msgnum);
 293         if (msg == NULL) {
 294                 cprintf("%d Message %ld not found.\n",
 295                         ERROR+ILLEGAL_VALUE,
 296                         (long)msgnum
 297                 );
 298                 return;
 299         }
 300
 301         memset(&ird, 0, sizeof ird);
 302         strcpy(ird.desired_partnum, partnum);
 303         mime_parser(msg->cm_fields['M'],
 304                 NULL,
 305                 *ical_locate_part,              /* callback function */
 306                 NULL, NULL,
 307                 (void *) &ird,                  /* user data */
 308                 0
 309         );
 310
 311         /* We're done with the incoming message, because we now have a
 312          * calendar object in memory.
 313          */
 314         CtdlFreeMessage(msg);
 315
 316         /*
 317          * Here is the real meat of this function.  Handle the event.
 318          */
 319         if (ird.cal != NULL) {
 320                 /* Save this in the user's calendar if necessary */
 321                 if (!strcasecmp(action, "accept")) {
 322                         ical_add(ird.cal, 0);
 323                 }
 324
 325                 /* Send a reply if necessary */
 326                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 327                         ical_send_a_reply(ird.cal, action);
 328                 }
 329
 330                 /* Now that we've processed this message, we don't need it
 331                  * anymore.  So delete it.
 332                  */
 333                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 334
 335                 /* Free the memory we allocated and return a response. */
 336                 icalcomponent_free(ird.cal);
 337                 ird.cal = NULL;
 338                 cprintf("%d ok\n", CIT_OK);
 339                 return;
 340         }
 341         else {
 342                 cprintf("%d No calendar object found\n", ERROR);
 343                 return;
 344         }
 345
 346         /* should never get here */
 347 }
 348
 349
 350 /*
 351  * Figure out the UID of the calendar event being referred to in a
 352  * REPLY object.  This function is recursive.
 353  */
 354 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 355         icalcomponent *subcomponent;
 356         icalproperty *p;
 357
 358         /* If this object is a REPLY, then extract the UID. */
 359         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 360                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 361                 if (p != NULL) {
 362                         strcpy(uidbuf, icalproperty_get_comment(p));
 363                 }
 364         }
 365
 366         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 367          * UID of the reply; we want the UID of the invitation being replied to.
 368          */
 369         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 370             subcomponent != NULL;
 371             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 372                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 373         }
 374 }
 375
 376
 377 /*
 378  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 379  * locate the message containing the calendar event we're replying to, this function
 380  * gets called.  It basically just sticks the message number in a supplied buffer.
 381  */
 382 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 383         long *msgnumptr;
 384
 385         msgnumptr = (long *) data;
 386         *msgnumptr = msgnum;
 387 }
 388
 389
 390 struct original_event_container {
 391         icalcomponent *c;
 392 };
 393
 394 /*
 395  * Callback function for mime parser that hunts for calendar content types
 396  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 397  * to fetch the object being updated)
 398  */
 399 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 400                 void *content, char *cbtype, size_t length, char *encoding,
 401                 void *cbuserdata) {
 402
 403         struct original_event_container *oec = NULL;
 404
 405         if (strcasecmp(cbtype, "text/calendar")) {
 406                 return;
 407         }
 408         oec = (struct original_event_container *) cbuserdata;
 409         if (oec->c != NULL) {
 410                 icalcomponent_free(oec->c);
 411         }
 412         oec->c = icalcomponent_new_from_string(content);
 413 }
 414
 415
 416 /*
 417  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 418  * calendar event.  The object has already been deserialized for us; all
 419  * we have to do here is hunt for the event in our calendar, merge in the
 420  * updated attendee status, and save it again.
 421  *
 422  * This function returns 0 on success, 1 if the event was not found in the
 423  * user's calendar, or 2 if an internal error occurred.
 424  */
 425 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 426         char uid[SIZ];
 427         char hold_rm[ROOMNAMELEN];
 428         long msgnum_being_replaced = 0;
 429         struct CtdlMessage *template = NULL;
 430         struct CtdlMessage *msg;
 431         struct original_event_container oec;
 432         icalcomponent *original_event;
 433
 434         /* Figure out just what event it is we're dealing with */
 435         strcpy(uid, "--==<< InVaLiD uId >>==--");
 436         ical_learn_uid_of_reply(uid, cal);
 437         lprintf(9, "UID of event being replied to is <%s>\n", uid);
 438
 439         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 440
 441         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 442                 getroom(&CC->quickroom, hold_rm);
 443                 lprintf(3, "cannot get user calendar room\n");
 444                 return(2);
 445         }
 446
 447         /*
 448          * Pound through the user's calendar looking for a message with
 449          * the Citadel EUID set to the value we're looking for.  Since
 450          * Citadel always sets the message EUID to the vCalendar UID of
 451          * the event, this will work.
 452          */
 453         template = (struct CtdlMessage *)
 454                 mallok(sizeof(struct CtdlMessage));
 455         memset(template, 0, sizeof(struct CtdlMessage));
 456         template->cm_fields['E'] = strdoop(uid);
 457         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 458                 template, ical_hunt_for_event_to_update, &msgnum_being_replaced);
 459         CtdlFreeMessage(template);
 460         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 461
 462         lprintf(9, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 463         if (msgnum_being_replaced == 0) {
 464                 return(1);                      /* no calendar event found */
 465         }
 466
 467         /* Now we know the ID of the message containing the event being updated.
 468          * We don't actually have to delete it; that'll get taken care of by the
 469          * server when we save another event with the same UID.  This just gives
 470          * us the ability to load the event into memory so we can diddle the
 471          * attendees.
 472          */
 473         msg = CtdlFetchMessage(msgnum_being_replaced);
 474         if (msg == NULL) {
 475                 return(2);                      /* internal error */
 476         }
 477         oec.c = NULL;
 478         mime_parser(msg->cm_fields['M'],
 479                 NULL,
 480                 *ical_locate_original_event,    /* callback function */
 481                 NULL, NULL,
 482                 &oec,                           /* user data */
 483                 0
 484         );
 485         CtdlFreeMessage(msg);
 486
 487         original_event = oec.c;
 488         if (original_event == NULL) {
 489                 lprintf(3, "ERROR: Original_component is NULL.\n");
 490                 return(1);
 491         }
 492
 493         /* FIXME finish this */
 494         /* merge "cal" into "original_event" */
 495         /* reserialize "original_event" and save to disk */
 496
 497         icalcomponent_free(original_event);
 498         return(0);
 499 }
 500
 501
 502 /*
 503  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 504  * simply extracts the calendar object from the message, deserializes it, and
 505  * passes it up to ical_update_my_calendar_with_reply() for processing.
 506  */
 507 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 508         struct CtdlMessage *msg;
 509         struct ical_respond_data ird;
 510         int ret;
 511
 512         if (
 513            (strcasecmp(action, "update"))
 514            && (strcasecmp(action, "ignore"))
 515         ) {
 516                 cprintf("%d Action must be 'update' or 'ignore'\n",
 517                         ERROR + ILLEGAL_VALUE
 518                 );
 519                 return;
 520         }
 521
 522         msg = CtdlFetchMessage(msgnum);
 523         if (msg == NULL) {
 524                 cprintf("%d Message %ld not found.\n",
 525                         ERROR+ILLEGAL_VALUE,
 526                         (long)msgnum
 527                 );
 528                 return;
 529         }
 530
 531         memset(&ird, 0, sizeof ird);
 532         strcpy(ird.desired_partnum, partnum);
 533         mime_parser(msg->cm_fields['M'],
 534                 NULL,
 535                 *ical_locate_part,              /* callback function */
 536                 NULL, NULL,
 537                 (void *) &ird,                  /* user data */
 538                 0
 539         );
 540
 541         /* We're done with the incoming message, because we now have a
 542          * calendar object in memory.
 543          */
 544         CtdlFreeMessage(msg);
 545
 546         /*
 547          * Here is the real meat of this function.  Handle the event.
 548          */
 549         if (ird.cal != NULL) {
 550                 /* Update the user's calendar if necessary */
 551                 if (!strcasecmp(action, "update")) {
 552                         ret = ical_update_my_calendar_with_reply(ird.cal);
 553                         if (ret == 0) {
 554                                 cprintf("%d Your calendar has been updated with this reply.\n",
 555                                         CIT_OK);
 556                         }
 557                         else if (ret == 1) {
 558                                 cprintf("%d This event does not exist in your calendar.\n",
 559                                         ERROR + FILE_NOT_FOUND);
 560                         }
 561                         else {
 562                                 cprintf("%d An internal error occurred.\n",
 563                                         ERROR + INTERNAL_ERROR);
 564                         }
 565                 }
 566                 else {
 567                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 568                 }
 569
 570                 /* Now that we've processed this message, we don't need it
 571                  * anymore.  So delete it.  FIXME uncomment this when ready!
 572                 CtdlDeleteMessages(CC->quickroom.QRname, msgnum, "");
 573                  */
 574
 575                 /* Free the memory we allocated and return a response. */
 576                 icalcomponent_free(ird.cal);
 577                 ird.cal = NULL;
 578                 return;
 579         }
 580         else {
 581                 cprintf("%d No calendar object found\n", ERROR);
 582                 return;
 583         }
 584
 585         /* should never get here */
 586 }
 587
 588
 589 /*
 590  * Search for a property in both the top level and in a VEVENT subcomponent
 591  */
 592 icalproperty *ical_ctdl_get_subprop(
 593                 icalcomponent *cal,
 594                 icalproperty_kind which_prop
 595 ) {
 596         icalproperty *p;
 597         icalcomponent *c;
 598
 599         p = icalcomponent_get_first_property(cal, which_prop);
 600         if (p == NULL) {
 601                 c = icalcomponent_get_first_component(cal,
 602                                                         ICAL_VEVENT_COMPONENT);
 603                 if (c != NULL) {
 604                         p = icalcomponent_get_first_property(c, which_prop);
 605                 }
 606         }
 607         return p;
 608 }
 609
 610
 611 /*
 612  * Check to see if two events overlap.  Returns nonzero if they do.
 613  */
 614 int ical_ctdl_is_overlap(
 615                         struct icaltimetype t1start,
 616                         struct icaltimetype t1end,
 617                         struct icaltimetype t2start,
 618                         struct icaltimetype t2end
 619 ) {
 620
 621         if (icaltime_is_null_time(t1start)) return(0);
 622         if (icaltime_is_null_time(t2start)) return(0);
 623
 624         /* First, check for all-day events */
 625         if (t1start.is_date) {
 626                 if (!icaltime_compare_date_only(t1start, t2start)) {
 627                         return(1);
 628                 }
 629                 if (!icaltime_is_null_time(t2end)) {
 630                         if (!icaltime_compare_date_only(t1start, t2end)) {
 631                                 return(1);
 632                         }
 633                 }
 634         }
 635
 636         if (t2start.is_date) {
 637                 if (!icaltime_compare_date_only(t2start, t1start)) {
 638                         return(1);
 639                 }
 640                 if (!icaltime_is_null_time(t1end)) {
 641                         if (!icaltime_compare_date_only(t2start, t1end)) {
 642                                 return(1);
 643                         }
 644                 }
 645         }
 646
 647         /* Now check for overlaps using date *and* time. */
 648
 649         /* First, bail out if either event 1 or event 2 is missing end time. */
 650         if (icaltime_is_null_time(t1end)) return(0);
 651         if (icaltime_is_null_time(t2end)) return(0);
 652
 653         /* If event 1 ends before event 2 starts, we're in the clear. */
 654         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 655
 656         /* If event 2 ends before event 1 starts, we're also ok. */
 657         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 658
 659         /* Otherwise, they overlap. */
 660         return(1);
 661 }
 662
 663
 664
 665 /*
 666  * Backend for ical_hunt_for_conflicts()
 667  */
 668 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 669         icalcomponent *cal;
 670         struct CtdlMessage *msg;
 671         struct ical_respond_data ird;
 672         struct icaltimetype t1start, t1end, t2start, t2end;
 673         icalproperty *p;
 674         char conflict_event_uid[SIZ];
 675         char conflict_event_summary[SIZ];
 676         char compare_uid[SIZ];
 677
 678         cal = (icalcomponent *)data;
 679         strcpy(compare_uid, "");
 680         strcpy(conflict_event_uid, "");
 681         strcpy(conflict_event_summary, "");
 682
 683         msg = CtdlFetchMessage(msgnum);
 684         if (msg == NULL) return;
 685         memset(&ird, 0, sizeof ird);
 686         strcpy(ird.desired_partnum, "1");       /* hopefully it's always 1 */
 687         mime_parser(msg->cm_fields['M'],
 688                 NULL,
 689                 *ical_locate_part,              /* callback function */
 690                 NULL, NULL,
 691                 (void *) &ird,                  /* user data */
 692                 0
 693         );
 694         CtdlFreeMessage(msg);
 695
 696         if (ird.cal == NULL) return;
 697
 698         t1start = icaltime_null_time();
 699         t1end = icaltime_null_time();
 700         t2start = icaltime_null_time();
 701         t1end = icaltime_null_time();
 702
 703         /* Now compare cal to ird.cal */
 704         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 705         if (p == NULL) return;
 706         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 707
 708         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 709         if (p != NULL) t2end = icalproperty_get_dtend(p);
 710
 711         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 712         if (p == NULL) return;
 713         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 714
 715         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 716         if (p != NULL) t1end = icalproperty_get_dtend(p);
 717
 718         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 719         if (p != NULL) {
 720                 strcpy(compare_uid, icalproperty_get_comment(p));
 721         }
 722
 723         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 724         if (p != NULL) {
 725                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 726         }
 727
 728         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 729         if (p != NULL) {
 730                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 731         }
 732
 733
 734         icalcomponent_free(ird.cal);
 735
 736         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 737                 cprintf("%ld||%s|%s|%d|\n",
 738                         msgnum,
 739                         conflict_event_uid,
 740                         conflict_event_summary,
 741                         (       ((strlen(compare_uid)>0)
 742                                 &&(!strcasecmp(compare_uid,
 743                                 conflict_event_uid))) ? 1 : 0
 744                         )
 745                 );
 746         }
 747 }
 748
 749
 750
 751 /*
 752  * Phase 2 of "hunt for conflicts" operation.
 753  * At this point we have a calendar object which represents the VEVENT that
 754  * we're considering adding to the calendar.  Now hunt through the user's
 755  * calendar room, and output zero or more existing VEVENTs which conflict
 756  * with this one.
 757  */
 758 void ical_hunt_for_conflicts(icalcomponent *cal) {
 759         char hold_rm[ROOMNAMELEN];
 760
 761         strcpy(hold_rm, CC->quickroom.QRname);  /* save current room */
 762
 763         if (getroom(&CC->quickroom, USERCALENDARROOM) != 0) {
 764                 getroom(&CC->quickroom, hold_rm);
 765                 cprintf("%d You do not have a calendar.\n", ERROR);
 766                 return;
 767         }
 768
 769         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 770
 771         CtdlForEachMessage(MSGS_ALL, 0, "text/calendar",
 772                 NULL,
 773                 ical_hunt_for_conflicts_backend,
 774                 (void *) cal
 775         );
 776
 777         cprintf("000\n");
 778         getroom(&CC->quickroom, hold_rm);       /* return to saved room */
 779
 780 }
 781
 782
 783
 784 /*
 785  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
 786  */
 787 void ical_conflicts(long msgnum, char *partnum) {
 788         struct CtdlMessage *msg;
 789         struct ical_respond_data ird;
 790
 791         msg = CtdlFetchMessage(msgnum);
 792         if (msg == NULL) {
 793                 cprintf("%d Message %ld not found.\n",
 794                         ERROR+ILLEGAL_VALUE,
 795                         (long)msgnum
 796                 );
 797                 return;
 798         }
 799
 800         memset(&ird, 0, sizeof ird);
 801         strcpy(ird.desired_partnum, partnum);
 802         mime_parser(msg->cm_fields['M'],
 803                 NULL,
 804                 *ical_locate_part,              /* callback function */
 805                 NULL, NULL,
 806                 (void *) &ird,                  /* user data */
 807                 0
 808         );
 809
 810         CtdlFreeMessage(msg);
 811
 812         if (ird.cal != NULL) {
 813                 ical_hunt_for_conflicts(ird.cal);
 814                 icalcomponent_free(ird.cal);
 815                 return;
 816         }
 817         else {
 818                 cprintf("%d No calendar object found\n", ERROR);
 819                 return;
 820         }
 821
 822         /* should never get here */
 823 }
 824
 825
 826
 827
 828 /*
 829  * All Citadel calendar commands from the client come through here.
 830  */
 831 void cmd_ical(char *argbuf)
 832 {
 833         char subcmd[SIZ];
 834         long msgnum;
 835         char partnum[SIZ];
 836         char action[SIZ];
 837
 838         if (CtdlAccessCheck(ac_logged_in)) return;
 839
 840         extract(subcmd, argbuf, 0);
 841
 842         if (!strcmp(subcmd, "test")) {
 843                 cprintf("%d This server supports calendaring\n", CIT_OK);
 844                 return;
 845         }
 846
 847         else if (!strcmp(subcmd, "respond")) {
 848                 msgnum = extract_long(argbuf, 1);
 849                 extract(partnum, argbuf, 2);
 850                 extract(action, argbuf, 3);
 851                 ical_respond(msgnum, partnum, action);
 852         }
 853
 854         else if (!strcmp(subcmd, "handle_rsvp")) {
 855                 msgnum = extract_long(argbuf, 1);
 856                 extract(partnum, argbuf, 2);
 857                 extract(action, argbuf, 3);
 858                 ical_handle_rsvp(msgnum, partnum, action);
 859         }
 860
 861         else if (!strcmp(subcmd, "conflicts")) {
 862                 msgnum = extract_long(argbuf, 1);
 863                 extract(partnum, argbuf, 2);
 864                 ical_conflicts(msgnum, partnum);
 865         }
 866
 867         else {
 868                 cprintf("%d Invalid subcommand\n", ERROR+CMD_NOT_SUPPORTED);
 869                 return;
 870         }
 871
 872         /* should never get here */
 873 }
 874
 875
 876
 877 /*
 878  * We don't know if the calendar room exists so we just create it at login
 879  */
 880 void ical_create_room(void)
 881 {
 882         struct quickroom qr;
 883         struct visit vbuf;
 884
 885         /* Create the calendar room if it doesn't already exist */
 886         create_room(USERCALENDARROOM, 4, "", 0, 1, 0);
 887
 888         /* Set expiration policy to manual; otherwise objects will be lost! */
 889         if (lgetroom(&qr, USERCALENDARROOM)) {
 890                 lprintf(3, "Couldn't get the user calendar room!\n");
 891                 return;
 892         }
 893         qr.QRep.expire_mode = EXPIRE_MANUAL;
 894         lputroom(&qr);
 895
 896         /* Set the view to a calendar view */
 897         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 898         vbuf.v_view = 3;        /* 3 = calendar */
 899         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 900
 901         /* Create the tasks list room if it doesn't already exist */
 902         create_room(USERTASKSROOM, 4, "", 0, 1, 0);
 903
 904         /* Set expiration policy to manual; otherwise objects will be lost! */
 905         if (lgetroom(&qr, USERTASKSROOM)) {
 906                 lprintf(3, "Couldn't get the user calendar room!\n");
 907                 return;
 908         }
 909         qr.QRep.expire_mode = EXPIRE_MANUAL;
 910         lputroom(&qr);
 911
 912         /* Set the view to a task list view */
 913         CtdlGetRelationship(&vbuf, &CC->usersupp, &qr);
 914         vbuf.v_view = 4;        /* 4 = tasks */
 915         CtdlSetRelationship(&vbuf, &CC->usersupp, &qr);
 916
 917         return;
 918 }
 919
 920
 921 /*
 922  * ical_send_out_invitations() is called by ical_saving_vevent() when it
 923  * finds a VEVENT.   FIXME ... finish implementing.
 924  */
 925 void ical_send_out_invitations(icalcomponent *cal) {
 926         icalcomponent *the_request = NULL;
 927         char *serialized_request = NULL;
 928         char *request_message_text = NULL;
 929         struct CtdlMessage *msg = NULL;
 930         struct recptypes *valid = NULL;
 931         char attendees_string[SIZ];
 932         char this_attendee[SIZ];
 933         icalproperty *attendee = NULL;
 934         char summary_string[SIZ];
 935         icalproperty *summary = NULL;
 936         icalcomponent *encaps = NULL;
 937
 938         if (cal == NULL) {
 939                 lprintf(3, "ERROR: trying to reply to NULL event?\n");
 940                 return;
 941         }
 942
 943         /* Clone the event */
 944         the_request = icalcomponent_new_clone(cal);
 945         if (the_request == NULL) {
 946                 lprintf(3, "ERROR: cannot clone calendar object\n");
 947                 return;
 948         }
 949
 950         /* Extract the summary string -- we'll use it as the
 951          * message subject for the request
 952          */
 953         strcpy(summary_string, "Meeting request");
 954         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
 955         if (summary != NULL) {
 956                 if (icalproperty_get_summary(summary)) {
 957                         strcpy(summary_string,
 958                                 icalproperty_get_summary(summary) );
 959                 }
 960         }
 961
 962         /* Determine who the recipients of this message are (the attendees) */
 963         strcpy(attendees_string, "");
 964         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
 965                 if (icalproperty_get_attendee(attendee)) {
 966                         strcpy(this_attendee, icalproperty_get_attendee(attendee) );
 967                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
 968                                 strcpy(this_attendee, &this_attendee[7]);
 969                                 snprintf(&attendees_string[strlen(attendees_string)],
 970                                         sizeof(attendees_string) - strlen(attendees_string),
 971                                         "%s, ",
 972                                         this_attendee
 973                                 );
 974                         }
 975                 }
 976         }
 977
 978         lprintf(9, "attendees_string: <%s>\n", attendees_string);
 979
 980         /* Encapsulate the VEVENT component into a complete VCALENDAR */
 981         encaps = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
 982         if (encaps == NULL) {
 983                 lprintf(3, "Error at %s:%d - could not allocate component!\n",
 984                         __FILE__, __LINE__);
 985                 icalcomponent_free(the_request);
 986                 return;
 987         }
 988
 989         /* Set the Product ID */
 990         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
 991
 992         /* Set the Version Number */
 993         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
 994
 995         /* Set the method to REQUEST */
 996         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
 997
 998         /* FIXME: here we need to insert a VTIMEZONE object. */
 999
1000         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1001          * are responsible for "the_request"'s memory -- it will be freed
1002          * when we free "encaps".
1003          */
1004         icalcomponent_add_component(encaps, the_request);
1005
1006         /* Serialize it */
1007         serialized_request = strdoop(icalcomponent_as_ical_string(encaps));
1008         icalcomponent_free(encaps);     /* Don't need this anymore. */
1009         if (serialized_request == NULL) return;
1010
1011         request_message_text = mallok(strlen(serialized_request) + SIZ);
1012         if (request_message_text != NULL) {
1013                 sprintf(request_message_text,
1014                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1015                         serialized_request
1016                 );
1017
1018                 msg = CtdlMakeMessage(&CC->usersupp,
1019                         "",                     /* No single recipient here */
1020                         CC->quickroom.QRname, 0, FMT_RFC822,
1021                         "",
1022                         summary_string,         /* Use summary for subject */
1023                         request_message_text);
1024
1025                 if (msg != NULL) {
1026                         valid = validate_recipients(attendees_string);
1027                         CtdlSubmitMsg(msg, valid, "");
1028                         CtdlFreeMessage(msg);
1029                 }
1030         }
1031         phree(serialized_request);
1032 }
1033
1034
1035 /*
1036  * When a calendar object is being saved, determine whether it's a VEVENT
1037  * and the user saving it is the organizer.  If so, send out invitations
1038  * to any listed attendees.
1039  *
1040  */
1041 void ical_saving_vevent(icalcomponent *cal) {
1042         icalcomponent *c;
1043         icalproperty *organizer = NULL;
1044         char organizer_string[SIZ];
1045
1046         strcpy(organizer_string, "");
1047         /*
1048          * The VEVENT subcomponent is the one we're interested in.
1049          * Send out invitations if, and only if, this user is the Organizer.
1050          */
1051         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1052                 organizer = icalcomponent_get_first_property(cal,
1053                                                 ICAL_ORGANIZER_PROPERTY);
1054                 if (organizer != NULL) {
1055                         if (icalproperty_get_organizer(organizer)) {
1056                                 strcpy(organizer_string,
1057                                         icalproperty_get_organizer(organizer));
1058                         }
1059                 }
1060                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1061                         strcpy(organizer_string, &organizer_string[7]);
1062                         striplt(organizer_string);
1063                         /*
1064                          * If the user saving the event is listed as the
1065                          * organizer, then send out invitations.
1066                          */
1067                         if (CtdlIsMe(organizer_string)) {
1068                                 ical_send_out_invitations(cal);
1069                         }
1070                 }
1071         }
1072
1073         /* If the component has subcomponents, recurse through them. */
1074         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1075             (c != NULL);
1076             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1077                 /* Recursively process subcomponent */
1078                 ical_saving_vevent(c);
1079         }
1080
1081 }
1082
1083
1084
1085 /*
1086  * Back end for ical_obj_beforesave()
1087  * This hunts for the UID of the calendar event.
1088  */
1089 void ical_ctdl_set_extended_msgid(char *name, char *filename, char *partnum,
1090                 char *disp, void *content, char *cbtype, size_t length,
1091                 char *encoding, void *cbuserdata)
1092 {
1093         icalcomponent *cal;
1094         icalproperty *p;
1095
1096         /* If this is a text/calendar object, hunt for the UID and drop it in
1097          * the "user data" pointer for the MIME parser.  When
1098          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1099          * to that string.
1100          */
1101         if (!strcasecmp(cbtype, "text/calendar")) {
1102                 cal = icalcomponent_new_from_string(content);
1103                 if (cal != NULL) {
1104                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1105                         if (p != NULL) {
1106                                 strcpy((char *)cbuserdata,
1107                                         icalproperty_get_comment(p)
1108                                 );
1109                         }
1110                         icalcomponent_free(cal);
1111                 }
1112         }
1113 }
1114
1115
1116
1117
1118
1119 /*
1120  * See if we need to prevent the object from being saved (we don't allow
1121  * MIME types other than text/calendar in the Calendar> room).  Also, when
1122  * saving an event to the calendar, set the message's Citadel extended message
1123  * ID to the UID of the object.  This causes our replication checker to
1124  * automatically delete any existing instances of the same object.  (Isn't
1125  * that cool?)
1126  */
1127 int ical_obj_beforesave(struct CtdlMessage *msg)
1128 {
1129         char roomname[ROOMNAMELEN];
1130         char *p;
1131         int a;
1132         char eidbuf[SIZ];
1133
1134         /*
1135          * Only messages with content-type text/calendar
1136          * may be saved to Calendar>.  If the message is bound for
1137          * Calendar> but doesn't have this content-type, throw an error
1138          * so that the message may not be posted.
1139          */
1140
1141         /* First determine if this is our room */
1142         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1143         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1144                 return 0;       /* It's not the Calendar room. */
1145         }
1146
1147         /* Then determine content-type of the message */
1148
1149         /* It must be an RFC822 message! */
1150         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1151         if (msg->cm_format_type != 4)
1152                 return 1;       /* You tried to save a non-RFC822 message! */
1153
1154         /* Find the Content-Type: header */
1155         p = msg->cm_fields['M'];
1156         a = strlen(p);
1157         while (--a > 0) {
1158                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1159                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1160                                 strcpy(eidbuf, "");
1161                                 mime_parser(msg->cm_fields['M'],
1162                                         NULL,
1163                                         *ical_ctdl_set_extended_msgid,
1164                                         NULL, NULL,
1165                                         (void *)eidbuf,
1166                                         0
1167                                 );
1168                                 if (strlen(eidbuf) > 0) {
1169                                         if (msg->cm_fields['E'] != NULL) {
1170                                                 phree(msg->cm_fields['E']);
1171                                         }
1172                                         msg->cm_fields['E'] = strdoop(eidbuf);
1173                                 }
1174                                 return 0;
1175                         }
1176                         else {
1177                                 return 1;
1178                         }
1179                 }
1180                 p++;
1181         }
1182
1183         /* Oops!  No Content-Type in this message!  How'd that happen? */
1184         lprintf(7, "RFC822 message with no Content-Type header!\n");
1185         return 1;
1186 }
1187
1188
1189 /*
1190  * Things we need to do after saving a calendar event.
1191  */
1192 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
1193                 char *disp, void *content, char *cbtype, size_t length,
1194                 char *encoding, void *cbuserdata)
1195 {
1196         icalcomponent *cal;
1197
1198         /* If this is a text/calendar object, hunt for the UID and drop it in
1199          * the "user data" pointer for the MIME parser.  When
1200          * ical_obj_beforesave() sees it there, it'll set the Extended msgid
1201          * to that string.
1202          */
1203         if (!strcasecmp(cbtype, "text/calendar")) {
1204                 cal = icalcomponent_new_from_string(content);
1205                 if (cal != NULL) {
1206                         ical_saving_vevent(cal);
1207                         icalcomponent_free(cal);
1208                 }
1209         }
1210 }
1211
1212
1213 /*
1214  * Things we need to do after saving a calendar event.
1215  */
1216 int ical_obj_aftersave(struct CtdlMessage *msg)
1217 {
1218         char roomname[ROOMNAMELEN];
1219         char *p;
1220         int a;
1221
1222         /*
1223          * If this isn't the Calendar> room, no further action is necessary.
1224          */
1225
1226         /* First determine if this is our room */
1227         MailboxName(roomname, sizeof roomname, &CC->usersupp, USERCALENDARROOM);
1228         if (strcasecmp(roomname, CC->quickroom.QRname)) {
1229                 return 0;       /* It's not the Calendar room. */
1230         }
1231
1232         /* Then determine content-type of the message */
1233
1234         /* It must be an RFC822 message! */
1235         /* FIXME: Not handling MIME multipart messages; implement with IMIP */
1236         if (msg->cm_format_type != 4) return(1);
1237
1238         /* Find the Content-Type: header */
1239         p = msg->cm_fields['M'];
1240         a = strlen(p);
1241         while (--a > 0) {
1242                 if (!strncasecmp(p, "Content-Type: ", 14)) {    /* Found it */
1243                         if (!strncasecmp(p + 14, "text/calendar", 13)) {
1244                                 mime_parser(msg->cm_fields['M'],
1245                                         NULL,
1246                                         *ical_obj_aftersave_backend,
1247                                         NULL, NULL,
1248                                         NULL,
1249                                         0
1250                                 );
1251                                 return 0;
1252                         }
1253                         else {
1254                                 return 1;
1255                         }
1256                 }
1257                 p++;
1258         }
1259
1260         /* Oops!  No Content-Type in this message!  How'd that happen? */
1261         lprintf(7, "RFC822 message with no Content-Type header!\n");
1262         return 1;
1263 }
1264
1265
1266 #endif  /* HAVE_ICAL_H */
1267
1268 /*
1269  * Register this module with the Citadel server.
1270  */
1271 char *Dynamic_Module_Init(void)
1272 {
1273 #ifdef HAVE_ICAL_H
1274         CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
1275         CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
1276         CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
1277         CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
1278 #endif
1279         return "$Id$";
1280 }