citadel/modules/calendar/serv_calendar.c

   1 /*
   2  * $Id$
   3  *
   4  * This module implements iCalendar object processing and the Calendar>
   5  * room on a Citadel server.  It handles iCalendar objects using the
   6  * iTIP protocol.  See RFCs 2445 and 2446.
   7  *
   8  */
   9
  10 #define PRODID "-//Citadel//NONSGML Citadel Calendar//EN"
  11
  12 #include "sysdep.h"
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <limits.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #ifdef HAVE_STRINGS_H
  20 #include <strings.h>
  21 #endif
  22 #include <libcitadel.h>
  23 #include "citadel.h"
  24 #include "server.h"
  25 #include "citserver.h"
  26 #include "support.h"
  27 #include "config.h"
  28 #include "user_ops.h"
  29 #include "room_ops.h"
  30 #include "msgbase.h"
  31 #include "internet_addressing.h"
  32 #include "serv_calendar.h"
  33 #include "euidindex.h"
  34 #include "ctdl_module.h"
  35
  36 #ifdef CITADEL_WITH_CALENDAR_SERVICE
  37
  38 #include <ical.h>
  39 #include "ical_dezonify.h"
  40
  41
  42
  43 struct ical_respond_data {
  44         char desired_partnum[SIZ];
  45         icalcomponent *cal;
  46 };
  47
  48
  49 /*
  50  * Utility function to create a new VCALENDAR component with some of the
  51  * required fields already set the way we like them.
  52  */
  53 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  54         icalcomponent *encaps;
  55
  56         encaps = icalcomponent_new_vcalendar();
  57         if (encaps == NULL) {
  58                 lprintf(CTDL_CRIT, "Error at %s:%d - could not allocate component!\n",
  59                         __FILE__, __LINE__);
  60                 return NULL;
  61         }
  62
  63         /* Set the Product ID */
  64         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  65
  66         /* Set the Version Number */
  67         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  68
  69         return(encaps);
  70 }
  71
  72
  73 /*
  74  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  75  */
  76 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  77         icalcomponent *encaps;
  78
  79         /* If we're already looking at a full VCALENDAR component,
  80          * don't bother ... just return itself.
  81          */
  82         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  83                 return subcomp;
  84         }
  85
  86         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  87         encaps = icalcomponent_new_citadel_vcalendar();
  88         if (encaps == NULL) return NULL;
  89
  90         /* Encapsulate the subcomponent inside */
  91         icalcomponent_add_component(encaps, subcomp);
  92
  93         /* Convert all timestamps to UTC so we don't have to deal with
  94          * stupid VTIMEZONE crap.
  95          */
  96         ical_dezonify(encaps);
  97
  98         /* Return the object we just created. */
  99         return(encaps);
 100 }
 101
 102
 103
 104
 105 /*
 106  * Write a calendar object into the specified user's calendar room.
 107  * If the supplied user is NULL, this function writes the calendar object
 108  * to the currently selected room.
 109  */
 110 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 111         char temp[PATH_MAX];
 112         FILE *fp = NULL;
 113         char *ser = NULL;
 114         icalcomponent *encaps = NULL;
 115         struct CtdlMessage *msg = NULL;
 116         icalcomponent *tmp=NULL;
 117
 118         if (cal == NULL) return;
 119
 120         /* If the supplied object is a subcomponent, encapsulate it in
 121          * a full VCALENDAR component, and save that instead.
 122          */
 123         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 124                 tmp = icalcomponent_new_clone(cal);
 125                 encaps = ical_encapsulate_subcomponent(tmp);
 126                 ical_write_to_cal(u, encaps);
 127                 icalcomponent_free(tmp);
 128                 icalcomponent_free(encaps);
 129                 return;
 130         }
 131
 132         ser = icalcomponent_as_ical_string(cal);
 133         if (ser == NULL) return;
 134
 135         /* If the caller supplied a user, write to that user's default calendar room */
 136         if (u) {
 137                 /* Make a temp file out of it */
 138                 CtdlMakeTempFileName(temp, sizeof temp);
 139                 fp = fopen(temp, "w");
 140                 if (fp != NULL) {
 141                         fwrite(ser, strlen(ser), 1, fp);
 142                         fclose(fp);
 143
 144                         /* This handy API function does all the work for us. */
 145                         CtdlWriteObject(USERCALENDARROOM,       /* which room */
 146                                 "text/calendar",        /* MIME type */
 147                                 temp,                   /* temp file */
 148                                 u,                      /* which user */
 149                                 0,                      /* not binary */
 150                                 0,                      /* don't delete others of this type */
 151                                 0                       /* no flags */
 152                         );
 153                         unlink(temp);
 154                 }
 155         }
 156
 157         /* If the caller did not supply a user, write to the currently selected room */
 158         if (!u) {
 159                 msg = malloc(sizeof(struct CtdlMessage));
 160                 memset(msg, 0, sizeof(struct CtdlMessage));
 161                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 162                 msg->cm_anon_type = MES_NORMAL;
 163                 msg->cm_format_type = 4;
 164                 msg->cm_fields['A'] = strdup(CC->user.fullname);
 165                 msg->cm_fields['O'] = strdup(CC->room.QRname);
 166                 msg->cm_fields['N'] = strdup(config.c_nodename);
 167                 msg->cm_fields['H'] = strdup(config.c_humannode);
 168                 msg->cm_fields['M'] = malloc(strlen(ser) + 40);
 169                 strcpy(msg->cm_fields['M'], "Content-type: text/calendar\r\n\r\n");
 170                 strcat(msg->cm_fields['M'], ser);
 171
 172                 /* Now write the data */
 173                 CtdlSubmitMsg(msg, NULL, "");
 174                 CtdlFreeMessage(msg);
 175         }
 176
 177         /* In either case, now we can free the serialized calendar object */
 178 //      free(ser);
 179 }
 180
 181
 182 /*
 183  * Add a calendar object to the user's calendar
 184  *
 185  * ok because it uses ical_write_to_cal()
 186  */
 187 void ical_add(icalcomponent *cal, int recursion_level) {
 188         icalcomponent *c;
 189
 190         /*
 191          * The VEVENT subcomponent is the one we're interested in saving.
 192          */
 193         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 194
 195                 ical_write_to_cal(&CC->user, cal);
 196
 197         }
 198
 199         /* If the component has subcomponents, recurse through them. */
 200         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
 201             (c != 0);
 202             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
 203                 /* Recursively process subcomponent */
 204                 ical_add(c, recursion_level+1);
 205         }
 206
 207 }
 208
 209
 210
 211 /*
 212  * Send a reply to a meeting invitation.
 213  *
 214  * 'request' is the invitation to reply to.
 215  * 'action' is the string "accept" or "decline" or "tentative".
 216  *
 217  */
 218 void ical_send_a_reply(icalcomponent *request, char *action) {
 219         icalcomponent *the_reply = NULL;
 220         icalcomponent *vevent = NULL;
 221         icalproperty *attendee = NULL;
 222         char attendee_string[SIZ];
 223         icalproperty *organizer = NULL;
 224         char organizer_string[SIZ];
 225         icalproperty *summary = NULL;
 226         char summary_string[SIZ];
 227         icalproperty *me_attend = NULL;
 228         struct recptypes *recp = NULL;
 229         icalparameter *partstat = NULL;
 230         char *serialized_reply = NULL;
 231         char *reply_message_text = NULL;
 232         struct CtdlMessage *msg = NULL;
 233         struct recptypes *valid = NULL;
 234
 235         strcpy(organizer_string, "");
 236         strcpy(summary_string, "Calendar item");
 237
 238         if (request == NULL) {
 239                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
 240                 return;
 241         }
 242
 243         the_reply = icalcomponent_new_clone(request);
 244         if (the_reply == NULL) {
 245                 lprintf(CTDL_ERR, "ERROR: cannot clone request\n");
 246                 return;
 247         }
 248
 249         /* Change the method from REQUEST to REPLY */
 250         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 251
 252         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 253         if (vevent != NULL) {
 254                 /* Hunt for attendees, removing ones that aren't us.
 255                  * (Actually, remove them all, cloning our own one so we can
 256                  * re-insert it later)
 257                  */
 258                 while (attendee = icalcomponent_get_first_property(vevent,
 259                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 260                 ) {
 261                         if (icalproperty_get_attendee(attendee)) {
 262                                 strcpy(attendee_string,
 263                                         icalproperty_get_attendee(attendee) );
 264                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 265                                         strcpy(attendee_string, &attendee_string[7]);
 266                                         striplt(attendee_string);
 267                                         recp = validate_recipients(attendee_string);
 268                                         if (recp != NULL) {
 269                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 270                                                         if (me_attend) icalproperty_free(me_attend);
 271                                                         me_attend = icalproperty_new_clone(attendee);
 272                                                 }
 273                                                 free_recipients(recp);
 274                                         }
 275                                 }
 276                         }
 277                         /* Remove it... */
 278                         icalcomponent_remove_property(vevent, attendee);
 279                         icalproperty_free(attendee);
 280                 }
 281
 282                 /* We found our own address in the attendee list. */
 283                 if (me_attend) {
 284                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 285                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 286
 287                         if (!strcasecmp(action, "accept")) {
 288                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 289                         }
 290                         else if (!strcasecmp(action, "decline")) {
 291                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 292                         }
 293                         else if (!strcasecmp(action, "tentative")) {
 294                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 295                         }
 296
 297                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 298
 299                         /* Now insert it back into the vevent. */
 300                         icalcomponent_add_property(vevent, me_attend);
 301                 }
 302
 303                 /* Figure out who to send this thing to */
 304                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 305                 if (organizer != NULL) {
 306                         if (icalproperty_get_organizer(organizer)) {
 307                                 strcpy(organizer_string,
 308                                         icalproperty_get_organizer(organizer) );
 309                         }
 310                 }
 311                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 312                         strcpy(organizer_string, &organizer_string[7]);
 313                         striplt(organizer_string);
 314                 } else {
 315                         strcpy(organizer_string, "");
 316                 }
 317
 318                 /* Extract the summary string -- we'll use it as the
 319                  * message subject for the reply
 320                  */
 321                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 322                 if (summary != NULL) {
 323                         if (icalproperty_get_summary(summary)) {
 324                                 strcpy(summary_string,
 325                                         icalproperty_get_summary(summary) );
 326                         }
 327                 }
 328         }
 329
 330         /* Now generate the reply message and send it out. */
 331         serialized_reply = strdup(icalcomponent_as_ical_string(the_reply));
 332         icalcomponent_free(the_reply);  /* don't need this anymore */
 333         if (serialized_reply == NULL) return;
 334
 335         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 336         if (reply_message_text != NULL) {
 337                 sprintf(reply_message_text,
 338                         "Content-type: text/calendar charset=\"utf-8\"\r\n\r\n%s\r\n",
 339                         serialized_reply
 340                 );
 341
 342                 msg = CtdlMakeMessage(&CC->user,
 343                         organizer_string,       /* to */
 344                         "",                     /* cc */
 345                         CC->room.QRname, 0, FMT_RFC822,
 346                         "",
 347                         "",
 348                         summary_string,         /* Use summary for subject */
 349                         NULL,
 350                         reply_message_text);
 351
 352                 if (msg != NULL) {
 353                         valid = validate_recipients(organizer_string);
 354                         CtdlSubmitMsg(msg, valid, "");
 355                         CtdlFreeMessage(msg);
 356                         free_recipients(valid);
 357                 }
 358         }
 359         free(serialized_reply);
 360 }
 361
 362
 363
 364 /*
 365  * Callback function for mime parser that hunts for calendar content types
 366  * and turns them into calendar objects
 367  */
 368 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 369                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 370                 void *cbuserdata) {
 371
 372         struct ical_respond_data *ird = NULL;
 373
 374         ird = (struct ical_respond_data *) cbuserdata;
 375
 376         /* desired_partnum can be set to "_HUNT_" to have it just look for
 377          * the first part with a content type of text/calendar.  Otherwise
 378          * we have to only process the right one.
 379          */
 380         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 381                 if (strcasecmp(partnum, ird->desired_partnum)) {
 382                         return;
 383                 }
 384         }
 385
 386         if (strcasecmp(cbtype, "text/calendar")) {
 387                 return;
 388         }
 389
 390         if (ird->cal != NULL) {
 391                 icalcomponent_free(ird->cal);
 392                 ird->cal = NULL;
 393         }
 394
 395         ird->cal = icalcomponent_new_from_string(content);
 396         if (ird->cal != NULL) {
 397                 ical_dezonify(ird->cal);
 398         }
 399 }
 400
 401
 402 /*
 403  * Respond to a meeting request.
 404  */
 405 void ical_respond(long msgnum, char *partnum, char *action) {
 406         struct CtdlMessage *msg = NULL;
 407         struct ical_respond_data ird;
 408
 409         if (
 410            (strcasecmp(action, "accept"))
 411            && (strcasecmp(action, "decline"))
 412         ) {
 413                 cprintf("%d Action must be 'accept' or 'decline'\n",
 414                         ERROR + ILLEGAL_VALUE
 415                 );
 416                 return;
 417         }
 418
 419         msg = CtdlFetchMessage(msgnum, 1);
 420         if (msg == NULL) {
 421                 cprintf("%d Message %ld not found.\n",
 422                         ERROR + ILLEGAL_VALUE,
 423                         (long)msgnum
 424                 );
 425                 return;
 426         }
 427
 428         memset(&ird, 0, sizeof ird);
 429         strcpy(ird.desired_partnum, partnum);
 430         mime_parser(msg->cm_fields['M'],
 431                 NULL,
 432                 *ical_locate_part,              /* callback function */
 433                 NULL, NULL,
 434                 (void *) &ird,                  /* user data */
 435                 0
 436         );
 437
 438         /* We're done with the incoming message, because we now have a
 439          * calendar object in memory.
 440          */
 441         CtdlFreeMessage(msg);
 442
 443         /*
 444          * Here is the real meat of this function.  Handle the event.
 445          */
 446         if (ird.cal != NULL) {
 447                 /* Save this in the user's calendar if necessary */
 448                 if (!strcasecmp(action, "accept")) {
 449                         ical_add(ird.cal, 0);
 450                 }
 451
 452                 /* Send a reply if necessary */
 453                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 454                         ical_send_a_reply(ird.cal, action);
 455                 }
 456
 457                 /* Now that we've processed this message, we don't need it
 458                  * anymore.  So delete it.  (NOTE we don't do this anymore.)
 459                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 460                  */
 461
 462                 /* Free the memory we allocated and return a response. */
 463                 icalcomponent_free(ird.cal);
 464                 ird.cal = NULL;
 465                 cprintf("%d ok\n", CIT_OK);
 466                 return;
 467         }
 468         else {
 469                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 470                 return;
 471         }
 472
 473         /* should never get here */
 474 }
 475
 476
 477 /*
 478  * Figure out the UID of the calendar event being referred to in a
 479  * REPLY object.  This function is recursive.
 480  */
 481 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 482         icalcomponent *subcomponent;
 483         icalproperty *p;
 484
 485         /* If this object is a REPLY, then extract the UID. */
 486         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 487                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 488                 if (p != NULL) {
 489                         strcpy(uidbuf, icalproperty_get_comment(p));
 490                 }
 491         }
 492
 493         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 494          * UID of the reply; we want the UID of the invitation being replied to.
 495          */
 496         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 497             subcomponent != NULL;
 498             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 499                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 500         }
 501 }
 502
 503
 504 /*
 505  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 506  * locate the message containing the calendar event we're replying to, this function
 507  * gets called.  It basically just sticks the message number in a supplied buffer.
 508  */
 509 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 510         long *msgnumptr;
 511
 512         msgnumptr = (long *) data;
 513         *msgnumptr = msgnum;
 514 }
 515
 516
 517 struct original_event_container {
 518         icalcomponent *c;
 519 };
 520
 521 /*
 522  * Callback function for mime parser that hunts for calendar content types
 523  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 524  * to fetch the object being updated)
 525  */
 526 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 527                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 528                 void *cbuserdata) {
 529
 530         struct original_event_container *oec = NULL;
 531
 532         if (strcasecmp(cbtype, "text/calendar")) {
 533                 return;
 534         }
 535         oec = (struct original_event_container *) cbuserdata;
 536         if (oec->c != NULL) {
 537                 icalcomponent_free(oec->c);
 538         }
 539         oec->c = icalcomponent_new_from_string(content);
 540 }
 541
 542
 543 /*
 544  * Merge updated attendee information from a REPLY into an existing event.
 545  */
 546 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 547         icalcomponent *c;
 548         icalproperty *e_attendee, *r_attendee;
 549
 550         /* First things first.  If we're not looking at a VEVENT component,
 551          * recurse through subcomponents until we find one.
 552          */
 553         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 554                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 555                     c != NULL;
 556                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 557                         ical_merge_attendee_reply(c, reply);
 558                 }
 559                 return;
 560         }
 561
 562         /* Now do the same thing with the reply.
 563          */
 564         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 565                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 566                     c != NULL;
 567                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 568                         ical_merge_attendee_reply(event, c);
 569                 }
 570                 return;
 571         }
 572
 573         /* Clone the reply, because we're going to rip its guts out. */
 574         reply = icalcomponent_new_clone(reply);
 575
 576         /* At this point we're looking at the correct subcomponents.
 577          * Iterate through the attendees looking for a match.
 578          */
 579 STARTOVER:
 580         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 581             e_attendee != NULL;
 582             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 583
 584                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 585                     r_attendee != NULL;
 586                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 587
 588                         /* Check to see if these two attendees match...
 589                          */
 590                         if (!strcasecmp(
 591                            icalproperty_get_attendee(e_attendee),
 592                            icalproperty_get_attendee(r_attendee)
 593                         )) {
 594                                 /* ...and if they do, remove the attendee from the event
 595                                  * and replace it with the attendee from the reply.  (The
 596                                  * reply's copy will have the same address, but an updated
 597                                  * status.)
 598                                  */
 599                                 icalcomponent_remove_property(event, e_attendee);
 600                                 icalproperty_free(e_attendee);
 601                                 icalcomponent_remove_property(reply, r_attendee);
 602                                 icalcomponent_add_property(event, r_attendee);
 603
 604                                 /* Since we diddled both sets of attendees, we have to start
 605                                  * the iteration over again.  This will not create an infinite
 606                                  * loop because we removed the attendee from the reply.  (That's
 607                                  * why we cloned the reply, and that's what we mean by "ripping
 608                                  * its guts out.")
 609                                  */
 610                                 goto STARTOVER;
 611                         }
 612
 613                 }
 614         }
 615
 616         /* Free the *clone* of the reply. */
 617         icalcomponent_free(reply);
 618 }
 619
 620
 621
 622
 623 /*
 624  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 625  * calendar event.  The object has already been deserialized for us; all
 626  * we have to do here is hunt for the event in our calendar, merge in the
 627  * updated attendee status, and save it again.
 628  *
 629  * This function returns 0 on success, 1 if the event was not found in the
 630  * user's calendar, or 2 if an internal error occurred.
 631  */
 632 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 633         char uid[SIZ];
 634         char hold_rm[ROOMNAMELEN];
 635         long msgnum_being_replaced = 0;
 636         struct CtdlMessage *msg = NULL;
 637         struct original_event_container oec;
 638         icalcomponent *original_event;
 639         char *serialized_event = NULL;
 640         char roomname[ROOMNAMELEN];
 641         char *message_text = NULL;
 642
 643         /* Figure out just what event it is we're dealing with */
 644         strcpy(uid, "--==<< InVaLiD uId >>==--");
 645         ical_learn_uid_of_reply(uid, cal);
 646         lprintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 647
 648         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 649
 650         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 651                 getroom(&CC->room, hold_rm);
 652                 lprintf(CTDL_CRIT, "cannot get user calendar room\n");
 653                 return(2);
 654         }
 655
 656         /*
 657          * Look in the EUID index for a message with
 658          * the Citadel EUID set to the value we're looking for.  Since
 659          * Citadel always sets the message EUID to the vCalendar UID of
 660          * the event, this will work.
 661          */
 662         msgnum_being_replaced = locate_message_by_euid(uid, &CC->room);
 663
 664         getroom(&CC->room, hold_rm);    /* return to saved room */
 665
 666         lprintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 667         if (msgnum_being_replaced == 0) {
 668                 return(1);                      /* no calendar event found */
 669         }
 670
 671         /* Now we know the ID of the message containing the event being updated.
 672          * We don't actually have to delete it; that'll get taken care of by the
 673          * server when we save another event with the same UID.  This just gives
 674          * us the ability to load the event into memory so we can diddle the
 675          * attendees.
 676          */
 677         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 678         if (msg == NULL) {
 679                 return(2);                      /* internal error */
 680         }
 681         oec.c = NULL;
 682         mime_parser(msg->cm_fields['M'],
 683                 NULL,
 684                 *ical_locate_original_event,    /* callback function */
 685                 NULL, NULL,
 686                 &oec,                           /* user data */
 687                 0
 688         );
 689         CtdlFreeMessage(msg);
 690
 691         original_event = oec.c;
 692         if (original_event == NULL) {
 693                 lprintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 694                 return(2);
 695         }
 696
 697         /* Merge the attendee's updated status into the event */
 698         ical_merge_attendee_reply(original_event, cal);
 699
 700         /* Serialize it */
 701         serialized_event = strdup(icalcomponent_as_ical_string(original_event));
 702         icalcomponent_free(original_event);     /* Don't need this anymore. */
 703         if (serialized_event == NULL) return(2);
 704
 705         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 706
 707         message_text = malloc(strlen(serialized_event) + SIZ);
 708         if (message_text != NULL) {
 709                 sprintf(message_text,
 710                         "Content-type: text/calendar charset=\"utf-8\"\r\n\r\n%s\r\n",
 711                         serialized_event
 712                 );
 713
 714                 msg = CtdlMakeMessage(&CC->user,
 715                         "",                     /* No recipient */
 716                         "",                     /* No recipient */
 717                         roomname,
 718                         0, FMT_RFC822,
 719                         "",
 720                         "",
 721                         "",             /* no subject */
 722                         NULL,
 723                         message_text);
 724
 725                 if (msg != NULL) {
 726                         CIT_ICAL->avoid_sending_invitations = 1;
 727                         CtdlSubmitMsg(msg, NULL, roomname);
 728                         CtdlFreeMessage(msg);
 729                         CIT_ICAL->avoid_sending_invitations = 0;
 730                 }
 731         }
 732         free(serialized_event);
 733         return(0);
 734 }
 735
 736
 737 /*
 738  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 739  * simply extracts the calendar object from the message, deserializes it, and
 740  * passes it up to ical_update_my_calendar_with_reply() for processing.
 741  */
 742 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 743         struct CtdlMessage *msg = NULL;
 744         struct ical_respond_data ird;
 745         int ret;
 746
 747         if (
 748            (strcasecmp(action, "update"))
 749            && (strcasecmp(action, "ignore"))
 750         ) {
 751                 cprintf("%d Action must be 'update' or 'ignore'\n",
 752                         ERROR + ILLEGAL_VALUE
 753                 );
 754                 return;
 755         }
 756
 757         msg = CtdlFetchMessage(msgnum, 1);
 758         if (msg == NULL) {
 759                 cprintf("%d Message %ld not found.\n",
 760                         ERROR + ILLEGAL_VALUE,
 761                         (long)msgnum
 762                 );
 763                 return;
 764         }
 765
 766         memset(&ird, 0, sizeof ird);
 767         strcpy(ird.desired_partnum, partnum);
 768         mime_parser(msg->cm_fields['M'],
 769                 NULL,
 770                 *ical_locate_part,              /* callback function */
 771                 NULL, NULL,
 772                 (void *) &ird,                  /* user data */
 773                 0
 774         );
 775
 776         /* We're done with the incoming message, because we now have a
 777          * calendar object in memory.
 778          */
 779         CtdlFreeMessage(msg);
 780
 781         /*
 782          * Here is the real meat of this function.  Handle the event.
 783          */
 784         if (ird.cal != NULL) {
 785                 /* Update the user's calendar if necessary */
 786                 if (!strcasecmp(action, "update")) {
 787                         ret = ical_update_my_calendar_with_reply(ird.cal);
 788                         if (ret == 0) {
 789                                 cprintf("%d Your calendar has been updated with this reply.\n",
 790                                         CIT_OK);
 791                         }
 792                         else if (ret == 1) {
 793                                 cprintf("%d This event does not exist in your calendar.\n",
 794                                         ERROR + FILE_NOT_FOUND);
 795                         }
 796                         else {
 797                                 cprintf("%d An internal error occurred.\n",
 798                                         ERROR + INTERNAL_ERROR);
 799                         }
 800                 }
 801                 else {
 802                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 803                 }
 804
 805                 /* Now that we've processed this message, we don't need it
 806                  * anymore.  So delete it.  (Don't do this anymore.)
 807                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 808                  */
 809
 810                 /* Free the memory we allocated and return a response. */
 811                 icalcomponent_free(ird.cal);
 812                 ird.cal = NULL;
 813                 return;
 814         }
 815         else {
 816                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 817                 return;
 818         }
 819
 820         /* should never get here */
 821 }
 822
 823
 824 /*
 825  * Search for a property in both the top level and in a VEVENT subcomponent
 826  */
 827 icalproperty *ical_ctdl_get_subprop(
 828                 icalcomponent *cal,
 829                 icalproperty_kind which_prop
 830 ) {
 831         icalproperty *p;
 832         icalcomponent *c;
 833
 834         p = icalcomponent_get_first_property(cal, which_prop);
 835         if (p == NULL) {
 836                 c = icalcomponent_get_first_component(cal,
 837                                                         ICAL_VEVENT_COMPONENT);
 838                 if (c != NULL) {
 839                         p = icalcomponent_get_first_property(c, which_prop);
 840                 }
 841         }
 842         return p;
 843 }
 844
 845
 846 /*
 847  * Check to see if two events overlap.  Returns nonzero if they do.
 848  * (This function is used in both Citadel and WebCit.  If you change it in
 849  * one place, change it in the other.  Better yet, put it in a library.)
 850  */
 851 int ical_ctdl_is_overlap(
 852                         struct icaltimetype t1start,
 853                         struct icaltimetype t1end,
 854                         struct icaltimetype t2start,
 855                         struct icaltimetype t2end
 856 ) {
 857
 858         if (icaltime_is_null_time(t1start)) return(0);
 859         if (icaltime_is_null_time(t2start)) return(0);
 860
 861         /* First, check for all-day events */
 862         if (t1start.is_date) {
 863                 if (!icaltime_compare_date_only(t1start, t2start)) {
 864                         return(1);
 865                 }
 866                 if (!icaltime_is_null_time(t2end)) {
 867                         if (!icaltime_compare_date_only(t1start, t2end)) {
 868                                 return(1);
 869                         }
 870                 }
 871         }
 872
 873         if (t2start.is_date) {
 874                 if (!icaltime_compare_date_only(t2start, t1start)) {
 875                         return(1);
 876                 }
 877                 if (!icaltime_is_null_time(t1end)) {
 878                         if (!icaltime_compare_date_only(t2start, t1end)) {
 879                                 return(1);
 880                         }
 881                 }
 882         }
 883
 884         /* Now check for overlaps using date *and* time. */
 885
 886         /* First, bail out if either event 1 or event 2 is missing end time. */
 887         if (icaltime_is_null_time(t1end)) return(0);
 888         if (icaltime_is_null_time(t2end)) return(0);
 889
 890         /* If event 1 ends before event 2 starts, we're in the clear. */
 891         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 892
 893         /* If event 2 ends before event 1 starts, we're also ok. */
 894         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 895
 896         /* Otherwise, they overlap. */
 897         return(1);
 898 }
 899
 900
 901
 902 /*
 903  * Backend for ical_hunt_for_conflicts()
 904  */
 905 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 906         icalcomponent *cal;
 907         struct CtdlMessage *msg = NULL;
 908         struct ical_respond_data ird;
 909         struct icaltimetype t1start, t1end, t2start, t2end;
 910         icalproperty *p;
 911         char conflict_event_uid[SIZ];
 912         char conflict_event_summary[SIZ];
 913         char compare_uid[SIZ];
 914
 915         cal = (icalcomponent *)data;
 916         strcpy(compare_uid, "");
 917         strcpy(conflict_event_uid, "");
 918         strcpy(conflict_event_summary, "");
 919
 920         msg = CtdlFetchMessage(msgnum, 1);
 921         if (msg == NULL) return;
 922         memset(&ird, 0, sizeof ird);
 923         strcpy(ird.desired_partnum, "_HUNT_");
 924         mime_parser(msg->cm_fields['M'],
 925                 NULL,
 926                 *ical_locate_part,              /* callback function */
 927                 NULL, NULL,
 928                 (void *) &ird,                  /* user data */
 929                 0
 930         );
 931         CtdlFreeMessage(msg);
 932
 933         if (ird.cal == NULL) return;
 934
 935         t1start = icaltime_null_time();
 936         t1end = icaltime_null_time();
 937         t2start = icaltime_null_time();
 938         t1end = icaltime_null_time();
 939
 940         /* Now compare cal to ird.cal */
 941         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 942         if (p == NULL) return;
 943         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 944
 945         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 946         if (p != NULL) t2end = icalproperty_get_dtend(p);
 947
 948         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 949         if (p == NULL) return;
 950         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 951
 952         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 953         if (p != NULL) t1end = icalproperty_get_dtend(p);
 954
 955         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 956         if (p != NULL) {
 957                 strcpy(compare_uid, icalproperty_get_comment(p));
 958         }
 959
 960         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 961         if (p != NULL) {
 962                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 963         }
 964
 965         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 966         if (p != NULL) {
 967                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 968         }
 969
 970         icalcomponent_free(ird.cal);
 971
 972         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 973                 cprintf("%ld||%s|%s|%d|\n",
 974                         msgnum,
 975                         conflict_event_uid,
 976                         conflict_event_summary,
 977                         (       ((strlen(compare_uid)>0)
 978                                 &&(!strcasecmp(compare_uid,
 979                                 conflict_event_uid))) ? 1 : 0
 980                         )
 981                 );
 982         }
 983 }
 984
 985
 986
 987 /*
 988  * Phase 2 of "hunt for conflicts" operation.
 989  * At this point we have a calendar object which represents the VEVENT that
 990  * we're considering adding to the calendar.  Now hunt through the user's
 991  * calendar room, and output zero or more existing VEVENTs which conflict
 992  * with this one.
 993  */
 994 void ical_hunt_for_conflicts(icalcomponent *cal) {
 995         char hold_rm[ROOMNAMELEN];
 996
 997         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 998
 999         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
1000                 getroom(&CC->room, hold_rm);
1001                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
1002                 return;
1003         }
1004
1005         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
1006
1007         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1008                 NULL,
1009                 NULL,
1010                 ical_hunt_for_conflicts_backend,
1011                 (void *) cal
1012         );
1013
1014         cprintf("000\n");
1015         getroom(&CC->room, hold_rm);    /* return to saved room */
1016
1017 }
1018
1019
1020
1021 /*
1022  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1023  */
1024 void ical_conflicts(long msgnum, char *partnum) {
1025         struct CtdlMessage *msg = NULL;
1026         struct ical_respond_data ird;
1027
1028         msg = CtdlFetchMessage(msgnum, 1);
1029         if (msg == NULL) {
1030                 cprintf("%d Message %ld not found.\n",
1031                         ERROR + ILLEGAL_VALUE,
1032                         (long)msgnum
1033                 );
1034                 return;
1035         }
1036
1037         memset(&ird, 0, sizeof ird);
1038         strcpy(ird.desired_partnum, partnum);
1039         mime_parser(msg->cm_fields['M'],
1040                 NULL,
1041                 *ical_locate_part,              /* callback function */
1042                 NULL, NULL,
1043                 (void *) &ird,                  /* user data */
1044                 0
1045         );
1046
1047         CtdlFreeMessage(msg);
1048
1049         if (ird.cal != NULL) {
1050                 ical_hunt_for_conflicts(ird.cal);
1051                 icalcomponent_free(ird.cal);
1052                 return;
1053         }
1054         else {
1055                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1056                 return;
1057         }
1058
1059         /* should never get here */
1060 }
1061
1062
1063
1064 /*
1065  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1066  */
1067 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1068         icalproperty *p;
1069         icalvalue *v;
1070         struct icalperiodtype my_period;
1071
1072         if (cal == NULL) return;
1073         my_period = icalperiodtype_null_period();
1074
1075         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1076                 ical_add_to_freebusy(fb,
1077                         icalcomponent_get_first_component(
1078                                 cal, ICAL_VEVENT_COMPONENT
1079                         )
1080                 );
1081                 return;
1082         }
1083
1084         ical_dezonify(cal);
1085
1086         /* If this event is not opaque, the user isn't publishing it as
1087          * busy time, so don't bother doing anything else.
1088          */
1089         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1090         if (p != NULL) {
1091                 v = icalproperty_get_value(p);
1092                 if (v != NULL) {
1093                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1094                                 return;
1095                         }
1096                 }
1097         }
1098
1099         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1100         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1101         if (p != NULL) {
1102                 my_period.start = icalproperty_get_dtstart(p);
1103         }
1104
1105         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1106         if (p != NULL) {
1107                 my_period.end = icalproperty_get_dtstart(p);
1108         }
1109
1110         /* Now add it. */
1111         icalcomponent_add_property(fb,
1112                 icalproperty_new_freebusy(my_period)
1113         );
1114
1115         /* Make sure the DTSTART property of the freebusy *list* is set to
1116          * the DTSTART property of the *earliest event*.
1117          */
1118         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1119         if (p == NULL) {
1120                 icalcomponent_set_dtstart(fb,
1121                         icalcomponent_get_dtstart(cal) );
1122         }
1123         else {
1124                 if (icaltime_compare(
1125                         icalcomponent_get_dtstart(cal),
1126                         icalcomponent_get_dtstart(fb)
1127                    ) < 0) {
1128                         icalcomponent_set_dtstart(fb,
1129                                 icalcomponent_get_dtstart(cal) );
1130                 }
1131         }
1132
1133         /* Make sure the DTEND property of the freebusy *list* is set to
1134          * the DTEND property of the *latest event*.
1135          */
1136         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1137         if (p == NULL) {
1138                 icalcomponent_set_dtend(fb,
1139                         icalcomponent_get_dtend(cal) );
1140         }
1141         else {
1142                 if (icaltime_compare(
1143                         icalcomponent_get_dtend(cal),
1144                         icalcomponent_get_dtend(fb)
1145                    ) > 0) {
1146                         icalcomponent_set_dtend(fb,
1147                                 icalcomponent_get_dtend(cal) );
1148                 }
1149         }
1150
1151 }
1152
1153
1154
1155 /*
1156  * Backend for ical_freebusy()
1157  *
1158  * This function simply loads the messages in the user's calendar room,
1159  * which contain VEVENTs, then strips them of all non-freebusy data, and
1160  * adds them to the supplied VCALENDAR.
1161  *
1162  */
1163 void ical_freebusy_backend(long msgnum, void *data) {
1164         icalcomponent *cal;
1165         struct CtdlMessage *msg = NULL;
1166         struct ical_respond_data ird;
1167
1168         cal = (icalcomponent *)data;
1169
1170         msg = CtdlFetchMessage(msgnum, 1);
1171         if (msg == NULL) return;
1172         memset(&ird, 0, sizeof ird);
1173         strcpy(ird.desired_partnum, "_HUNT_");
1174         mime_parser(msg->cm_fields['M'],
1175                 NULL,
1176                 *ical_locate_part,              /* callback function */
1177                 NULL, NULL,
1178                 (void *) &ird,                  /* user data */
1179                 0
1180         );
1181         CtdlFreeMessage(msg);
1182
1183         if (ird.cal == NULL) return;
1184
1185         ical_add_to_freebusy(cal, ird.cal);
1186
1187         /* Now free the memory. */
1188         icalcomponent_free(ird.cal);
1189 }
1190
1191
1192
1193 /*
1194  * Grab another user's free/busy times
1195  */
1196 void ical_freebusy(char *who) {
1197         struct ctdluser usbuf;
1198         char calendar_room_name[ROOMNAMELEN];
1199         char hold_rm[ROOMNAMELEN];
1200         char *serialized_request = NULL;
1201         icalcomponent *encaps = NULL;
1202         icalcomponent *fb = NULL;
1203         int found_user = (-1);
1204         struct recptypes *recp = NULL;
1205         char buf[256];
1206         char host[256];
1207         char type[256];
1208         int i = 0;
1209         int config_lines = 0;
1210
1211         /* First try an exact match. */
1212         found_user = getuser(&usbuf, who);
1213
1214         /* If not found, try it as an unqualified email address. */
1215         if (found_user != 0) {
1216                 strcpy(buf, who);
1217                 recp = validate_recipients(buf);
1218                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1219                 if (recp != NULL) {
1220                         if (recp->num_local == 1) {
1221                                 found_user = getuser(&usbuf, recp->recp_local);
1222                         }
1223                         free_recipients(recp);
1224                 }
1225         }
1226
1227         /* If still not found, try it as an address qualified with the
1228          * primary FQDN of this Citadel node.
1229          */
1230         if (found_user != 0) {
1231                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1232                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1233                 recp = validate_recipients(buf);
1234                 if (recp != NULL) {
1235                         if (recp->num_local == 1) {
1236                                 found_user = getuser(&usbuf, recp->recp_local);
1237                         }
1238                         free_recipients(recp);
1239                 }
1240         }
1241
1242         /* Still not found?  Try qualifying it with every domain we
1243          * might have addresses in.
1244          */
1245         if (found_user != 0) {
1246                 config_lines = num_tokens(inetcfg, '\n');
1247                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1248                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1249                         extract_token(host, buf, 0, '|', sizeof host);
1250                         extract_token(type, buf, 1, '|', sizeof type);
1251
1252                         if ( (!strcasecmp(type, "localhost"))
1253                            || (!strcasecmp(type, "directory")) ) {
1254                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1255                                 lprintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1256                                 recp = validate_recipients(buf);
1257                                 if (recp != NULL) {
1258                                         if (recp->num_local == 1) {
1259                                                 found_user = getuser(&usbuf, recp->recp_local);
1260                                         }
1261                                         free_recipients(recp);
1262                                 }
1263                         }
1264                 }
1265         }
1266
1267         if (found_user != 0) {
1268                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1269                 return;
1270         }
1271
1272         MailboxName(calendar_room_name, sizeof calendar_room_name,
1273                 &usbuf, USERCALENDARROOM);
1274
1275         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1276
1277         if (getroom(&CC->room, calendar_room_name) != 0) {
1278                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1279                 getroom(&CC->room, hold_rm);
1280                 return;
1281         }
1282
1283         /* Create a VFREEBUSY subcomponent */
1284         lprintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1285         fb = icalcomponent_new_vfreebusy();
1286         if (fb == NULL) {
1287                 cprintf("%d Internal error: cannot allocate memory.\n",
1288                         ERROR + INTERNAL_ERROR);
1289                 getroom(&CC->room, hold_rm);
1290                 return;
1291         }
1292
1293         /* Set the method to PUBLISH */
1294         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1295
1296         /* Set the DTSTAMP to right now. */
1297         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1298
1299         /* Add the user's email address as ORGANIZER */
1300         sprintf(buf, "MAILTO:%s", who);
1301         if (strchr(buf, '@') == NULL) {
1302                 strcat(buf, "@");
1303                 strcat(buf, config.c_fqdn);
1304         }
1305         for (i=0; buf[i]; ++i) {
1306                 if (buf[i]==' ') buf[i] = '_';
1307         }
1308         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1309
1310         /* Add busy time from events */
1311         lprintf(CTDL_DEBUG, "Adding busy time from events\n");
1312         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1313
1314         /* If values for DTSTART and DTEND are still not present, set them
1315          * to yesterday and tomorrow as default values.
1316          */
1317         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1318                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1319         }
1320         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1321                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1322         }
1323
1324         /* Put the freebusy component into the calendar component */
1325         lprintf(CTDL_DEBUG, "Encapsulating\n");
1326         encaps = ical_encapsulate_subcomponent(fb);
1327         if (encaps == NULL) {
1328                 icalcomponent_free(fb);
1329                 cprintf("%d Internal error: cannot allocate memory.\n",
1330                         ERROR + INTERNAL_ERROR);
1331                 getroom(&CC->room, hold_rm);
1332                 return;
1333         }
1334
1335         /* Set the method to PUBLISH */
1336         lprintf(CTDL_DEBUG, "Setting method\n");
1337         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1338
1339         /* Serialize it */
1340         lprintf(CTDL_DEBUG, "Serializing\n");
1341         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1342         icalcomponent_free(encaps);     /* Don't need this anymore. */
1343
1344         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1345         if (serialized_request != NULL) {
1346                 client_write(serialized_request, strlen(serialized_request));
1347                 free(serialized_request);
1348         }
1349         cprintf("\n000\n");
1350
1351         /* Go back to the room from which we came... */
1352         getroom(&CC->room, hold_rm);
1353 }
1354
1355
1356
1357 /*
1358  * Backend for ical_getics()
1359  *
1360  * This is a ForEachMessage() callback function that searches the current room
1361  * for calendar events and adds them each into one big calendar component.
1362  */
1363 void ical_getics_backend(long msgnum, void *data) {
1364         icalcomponent *encaps, *c;
1365         struct CtdlMessage *msg = NULL;
1366         struct ical_respond_data ird;
1367
1368         encaps = (icalcomponent *)data;
1369         if (encaps == NULL) return;
1370
1371         /* Look for the calendar event... */
1372
1373         msg = CtdlFetchMessage(msgnum, 1);
1374         if (msg == NULL) return;
1375         memset(&ird, 0, sizeof ird);
1376         strcpy(ird.desired_partnum, "_HUNT_");
1377         mime_parser(msg->cm_fields['M'],
1378                 NULL,
1379                 *ical_locate_part,              /* callback function */
1380                 NULL, NULL,
1381                 (void *) &ird,                  /* user data */
1382                 0
1383         );
1384         CtdlFreeMessage(msg);
1385
1386         if (ird.cal == NULL) return;
1387
1388         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1389          * are responsible for "the_request"'s memory -- it will be freed
1390          * when we free "encaps".
1391          */
1392
1393         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1394          * in.  This will almost never happen.
1395          */
1396         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1397                 icalcomponent_add_component(encaps, ird.cal);
1398         }
1399         /*
1400          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1401          * and other components encapsulated inside, we have to extract them.
1402          */
1403         else {
1404                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1405                     (c != NULL);
1406                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1407                         icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1408                 }
1409                 icalcomponent_free(ird.cal);
1410         }
1411 }
1412
1413
1414
1415 /*
1416  * Retrieve all of the calendar items in the current room, and output them
1417  * as a single icalendar object.
1418  */
1419 void ical_getics(void)
1420 {
1421         icalcomponent *encaps = NULL;
1422         char *ser = NULL;
1423
1424         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1425            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1426                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1427                 return;         /* Not a vCalendar-centric room */
1428         }
1429
1430         encaps = icalcomponent_new_vcalendar();
1431         if (encaps == NULL) {
1432                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1433                         __FILE__, __LINE__);
1434                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1435                 return;
1436         }
1437
1438         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1439
1440         /* Set the Product ID */
1441         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1442
1443         /* Set the Version Number */
1444         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1445
1446         /* Set the method to PUBLISH */
1447         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1448
1449         /* Now go through the room encapsulating all calendar items. */
1450         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1451                 NULL,
1452                 NULL,
1453                 ical_getics_backend,
1454                 (void *) encaps
1455         );
1456
1457         ser = strdup(icalcomponent_as_ical_string(encaps));
1458         client_write(ser, strlen(ser));
1459         free(ser);
1460         cprintf("\n000\n");
1461         icalcomponent_free(encaps);     /* Don't need this anymore. */
1462
1463 }
1464
1465
1466 /*
1467  * Delete all of the calendar items in the current room, and replace them
1468  * with calendar items from a client-supplied data stream.
1469  */
1470 void ical_putics(void)
1471 {
1472         char *calstream = NULL;
1473         icalcomponent *cal;
1474         icalcomponent *c;
1475
1476         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1477            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1478                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1479                 return;         /* Not a vCalendar-centric room */
1480         }
1481
1482         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1483                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1484                 return;
1485         }
1486
1487         cprintf("%d Transmit data now\n", SEND_LISTING);
1488         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0, 0);
1489         if (calstream == NULL) {
1490                 return;
1491         }
1492
1493         cal = icalcomponent_new_from_string(calstream);
1494         free(calstream);
1495         ical_dezonify(cal);
1496
1497         /* We got our data stream -- now do something with it. */
1498
1499         /* Delete the existing messages in the room, because we are replacing
1500          * the entire calendar with an entire new (or updated) calendar.
1501          * (Careful: this opens an S_ROOMS critical section!)
1502          */
1503         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1504
1505         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1506          * in.  This will almost never happen.
1507          */
1508         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1509                 ical_write_to_cal(NULL, cal);
1510         }
1511         /*
1512          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1513          * and other components encapsulated inside, we have to extract them.
1514          */
1515         else {
1516                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1517                     (c != NULL);
1518                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1519                         ical_write_to_cal(NULL, c);
1520                 }
1521         }
1522
1523         icalcomponent_free(cal);
1524 }
1525
1526
1527 /*
1528  * All Citadel calendar commands from the client come through here.
1529  */
1530 void cmd_ical(char *argbuf)
1531 {
1532         char subcmd[64];
1533         long msgnum;
1534         char partnum[256];
1535         char action[256];
1536         char who[256];
1537
1538         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1539
1540         /* Allow "test" and "freebusy" subcommands without logging in. */
1541
1542         if (!strcasecmp(subcmd, "test")) {
1543                 cprintf("%d This server supports calendaring\n", CIT_OK);
1544                 return;
1545         }
1546
1547         if (!strcasecmp(subcmd, "freebusy")) {
1548                 extract_token(who, argbuf, 1, '|', sizeof who);
1549                 ical_freebusy(who);
1550                 return;
1551         }
1552
1553         if (!strcasecmp(subcmd, "sgi")) {
1554                 CIT_ICAL->server_generated_invitations =
1555                         (extract_int(argbuf, 1) ? 1 : 0) ;
1556                 cprintf("%d %d\n",
1557                         CIT_OK, CIT_ICAL->server_generated_invitations);
1558                 return;
1559         }
1560
1561         if (CtdlAccessCheck(ac_logged_in)) return;
1562
1563         if (!strcasecmp(subcmd, "respond")) {
1564                 msgnum = extract_long(argbuf, 1);
1565                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1566                 extract_token(action, argbuf, 3, '|', sizeof action);
1567                 ical_respond(msgnum, partnum, action);
1568                 return;
1569         }
1570
1571         if (!strcasecmp(subcmd, "handle_rsvp")) {
1572                 msgnum = extract_long(argbuf, 1);
1573                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1574                 extract_token(action, argbuf, 3, '|', sizeof action);
1575                 ical_handle_rsvp(msgnum, partnum, action);
1576                 return;
1577         }
1578
1579         if (!strcasecmp(subcmd, "conflicts")) {
1580                 msgnum = extract_long(argbuf, 1);
1581                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1582                 ical_conflicts(msgnum, partnum);
1583                 return;
1584         }
1585
1586         if (!strcasecmp(subcmd, "getics")) {
1587                 ical_getics();
1588                 return;
1589         }
1590
1591         if (!strcasecmp(subcmd, "putics")) {
1592                 ical_putics();
1593                 return;
1594         }
1595
1596         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1597 }
1598
1599
1600
1601 /*
1602  * We don't know if the calendar room exists so we just create it at login
1603  */
1604 void ical_create_room(void)
1605 {
1606         struct ctdlroom qr;
1607         struct visit vbuf;
1608
1609         /* Create the calendar room if it doesn't already exist */
1610         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1611
1612         /* Set expiration policy to manual; otherwise objects will be lost! */
1613         if (lgetroom(&qr, USERCALENDARROOM)) {
1614                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1615                 return;
1616         }
1617         qr.QRep.expire_mode = EXPIRE_MANUAL;
1618         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1619         lputroom(&qr);
1620
1621         /* Set the view to a calendar view */
1622         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1623         vbuf.v_view = VIEW_CALENDAR;
1624         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1625
1626         /* Create the tasks list room if it doesn't already exist */
1627         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1628
1629         /* Set expiration policy to manual; otherwise objects will be lost! */
1630         if (lgetroom(&qr, USERTASKSROOM)) {
1631                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1632                 return;
1633         }
1634         qr.QRep.expire_mode = EXPIRE_MANUAL;
1635         qr.QRdefaultview = VIEW_TASKS;
1636         lputroom(&qr);
1637
1638         /* Set the view to a task list view */
1639         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1640         vbuf.v_view = VIEW_TASKS;
1641         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1642
1643         /* Create the notes room if it doesn't already exist */
1644         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1645
1646         /* Set expiration policy to manual; otherwise objects will be lost! */
1647         if (lgetroom(&qr, USERNOTESROOM)) {
1648                 lprintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1649                 return;
1650         }
1651         qr.QRep.expire_mode = EXPIRE_MANUAL;
1652         qr.QRdefaultview = VIEW_NOTES;
1653         lputroom(&qr);
1654
1655         /* Set the view to a notes view */
1656         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1657         vbuf.v_view = VIEW_NOTES;
1658         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1659
1660         return;
1661 }
1662
1663
1664 /*
1665  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1666  * finds a VEVENT.
1667  */
1668 void ical_send_out_invitations(icalcomponent *cal) {
1669         icalcomponent *the_request = NULL;
1670         char *serialized_request = NULL;
1671         icalcomponent *encaps = NULL;
1672         char *request_message_text = NULL;
1673         struct CtdlMessage *msg = NULL;
1674         struct recptypes *valid = NULL;
1675         char attendees_string[SIZ];
1676         int num_attendees = 0;
1677         char this_attendee[256];
1678         icalproperty *attendee = NULL;
1679         char summary_string[SIZ];
1680         icalproperty *summary = NULL;
1681
1682         if (cal == NULL) {
1683                 lprintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1684                 return;
1685         }
1686
1687
1688         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1689         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1690                 ical_send_out_invitations(
1691                         icalcomponent_get_first_component(
1692                                 cal, ICAL_VEVENT_COMPONENT
1693                         )
1694                 );
1695                 return;
1696         }
1697
1698         /* Clone the event */
1699         the_request = icalcomponent_new_clone(cal);
1700         if (the_request == NULL) {
1701                 lprintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1702                 return;
1703         }
1704
1705         /* Extract the summary string -- we'll use it as the
1706          * message subject for the request
1707          */
1708         strcpy(summary_string, "Meeting request");
1709         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1710         if (summary != NULL) {
1711                 if (icalproperty_get_summary(summary)) {
1712                         strcpy(summary_string,
1713                                 icalproperty_get_summary(summary) );
1714                 }
1715         }
1716
1717         /* Determine who the recipients of this message are (the attendees) */
1718         strcpy(attendees_string, "");
1719         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1720                 if (icalproperty_get_attendee(attendee)) {
1721                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1722                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1723                                 strcpy(this_attendee, &this_attendee[7]);
1724
1725                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1726                                         snprintf(&attendees_string[strlen(attendees_string)],
1727                                                 sizeof(attendees_string) - strlen(attendees_string),
1728                                                 "%s, ",
1729                                                 this_attendee
1730                                         );
1731                                         ++num_attendees;
1732                                 }
1733                         }
1734                 }
1735         }
1736
1737         lprintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1738
1739         /* If there are no attendees, there are no invitations to send, so...
1740          * don't bother putting one together!  Punch out, Maverick!
1741          */
1742         if (num_attendees == 0) {
1743                 icalcomponent_free(the_request);
1744                 return;
1745         }
1746
1747         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1748         encaps = icalcomponent_new_vcalendar();
1749         if (encaps == NULL) {
1750                 lprintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1751                         __FILE__, __LINE__);
1752                 icalcomponent_free(the_request);
1753                 return;
1754         }
1755
1756         /* Set the Product ID */
1757         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1758
1759         /* Set the Version Number */
1760         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1761
1762         /* Set the method to REQUEST */
1763         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1764
1765         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1766         ical_dezonify(the_request);
1767
1768         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1769          * are responsible for "the_request"'s memory -- it will be freed
1770          * when we free "encaps".
1771          */
1772         icalcomponent_add_component(encaps, the_request);
1773
1774         /* Serialize it */
1775         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1776         icalcomponent_free(encaps);     /* Don't need this anymore. */
1777         if (serialized_request == NULL) return;
1778
1779         request_message_text = malloc(strlen(serialized_request) + SIZ);
1780         if (request_message_text != NULL) {
1781                 sprintf(request_message_text,
1782                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1783                         serialized_request
1784                 );
1785
1786                 msg = CtdlMakeMessage(&CC->user,
1787                         "",                     /* No single recipient here */
1788                         "",                     /* No single recipient here */
1789                         CC->room.QRname, 0, FMT_RFC822,
1790                         "",
1791                         "",
1792                         summary_string,         /* Use summary for subject */
1793                         NULL,
1794                         request_message_text);
1795
1796                 if (msg != NULL) {
1797                         valid = validate_recipients(attendees_string);
1798                         CtdlSubmitMsg(msg, valid, "");
1799                         CtdlFreeMessage(msg);
1800                         free_recipients(valid);
1801                 }
1802         }
1803         free(serialized_request);
1804 }
1805
1806
1807 /*
1808  * When a calendar object is being saved, determine whether it's a VEVENT
1809  * and the user saving it is the organizer.  If so, send out invitations
1810  * to any listed attendees.
1811  *
1812  */
1813 void ical_saving_vevent(icalcomponent *cal) {
1814         icalcomponent *c;
1815         icalproperty *organizer = NULL;
1816         char organizer_string[SIZ];
1817
1818         lprintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
1819
1820         /* Don't send out invitations unless the client wants us to. */
1821         if (CIT_ICAL->server_generated_invitations == 0) {
1822                 return;
1823         }
1824
1825         /* Don't send out invitations if we've been asked not to. */
1826         if (CIT_ICAL->avoid_sending_invitations > 0) {
1827                 return;
1828         }
1829
1830         strcpy(organizer_string, "");
1831         /*
1832          * The VEVENT subcomponent is the one we're interested in.
1833          * Send out invitations if, and only if, this user is the Organizer.
1834          */
1835         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1836                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
1837                 if (organizer != NULL) {
1838                         if (icalproperty_get_organizer(organizer)) {
1839                                 strcpy(organizer_string,
1840                                         icalproperty_get_organizer(organizer));
1841                         }
1842                 }
1843                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1844                         strcpy(organizer_string, &organizer_string[7]);
1845                         striplt(organizer_string);
1846                         /*
1847                          * If the user saving the event is listed as the
1848                          * organizer, then send out invitations.
1849                          */
1850                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
1851                                 ical_send_out_invitations(cal);
1852                         }
1853                 }
1854         }
1855
1856         /* If the component has subcomponents, recurse through them. */
1857         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1858             (c != NULL);
1859             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1860                 /* Recursively process subcomponent */
1861                 ical_saving_vevent(c);
1862         }
1863
1864 }
1865
1866
1867
1868 /*
1869  * Back end for ical_obj_beforesave()
1870  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1871  * the summary of the event (becomes message subject),
1872  * and the start time (becomes message date/time).
1873  */
1874 void ical_ctdl_set_exclusive_msgid(char *name, char *filename, char *partnum,
1875                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1876                 char *encoding, void *cbuserdata)
1877 {
1878         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
1879         icalproperty *p;
1880         struct icalmessagemod *imm;
1881         char new_uid[SIZ];
1882
1883         imm = (struct icalmessagemod *)cbuserdata;
1884
1885         /* We're only interested in calendar data. */
1886         if (strcasecmp(cbtype, "text/calendar")) {
1887                 return;
1888         }
1889
1890         /* Hunt for the UID and drop it in
1891          * the "user data" pointer for the MIME parser.  When
1892          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1893          * to that string.
1894          */
1895         whole_cal = icalcomponent_new_from_string(content);
1896         cal = whole_cal;
1897         if (cal != NULL) {
1898                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1899                         nested_event = icalcomponent_get_first_component(
1900                                 cal, ICAL_VEVENT_COMPONENT);
1901                         if (nested_event != NULL) {
1902                                 cal = nested_event;
1903                         }
1904                         else {
1905                                 nested_todo = icalcomponent_get_first_component(
1906                                         cal, ICAL_VTODO_COMPONENT);
1907                                 if (nested_todo != NULL) {
1908                                         cal = nested_todo;
1909                                 }
1910                         }
1911                 }
1912
1913                 if (cal != NULL) {
1914                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1915                         if (p == NULL) {
1916                                 /* If there's no uid we must generate one */
1917                                 generate_uuid(new_uid);
1918                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
1919                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1920                         }
1921                         if (p != NULL) {
1922                                 strcpy(imm->uid, icalproperty_get_comment(p));
1923                         }
1924                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1925                         if (p != NULL) {
1926                                 strcpy(imm->subject, icalproperty_get_comment(p));
1927                         }
1928                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1929                         if (p != NULL) {
1930                                 imm->dtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1931                         }
1932                 }
1933                 icalcomponent_free(cal);
1934                 if (whole_cal != cal) {
1935                         icalcomponent_free(whole_cal);
1936                 }
1937         }
1938 }
1939
1940
1941
1942
1943 /*
1944  * See if we need to prevent the object from being saved (we don't allow
1945  * MIME types other than text/calendar in "calendar" or "tasks"  rooms).  Also,
1946  * when saving an event to the calendar, set the message's Citadel exclusive
1947  * message ID to the UID of the object.  This causes our replication checker to
1948  * automatically delete any existing instances of the same object.  (Isn't
1949  * that cool?)
1950  *
1951  * We also set the message's Subject to the event summary, and the Date/time to
1952  * the event start time.
1953  */
1954 int ical_obj_beforesave(struct CtdlMessage *msg)
1955 {
1956         struct icalmessagemod imm;
1957
1958         /* First determine if this is a calendar or tasks room */
1959         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
1960            && (CC->room.QRdefaultview != VIEW_TASKS)
1961         ) {
1962                 return(0);              /* Not a vCalendar-centric room */
1963         }
1964
1965         /* It must be an RFC822 message! */
1966         if (msg->cm_format_type != 4) {
1967                 lprintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
1968                 return(1);              /* You tried to save a non-RFC822 message! */
1969         }
1970
1971         if (msg->cm_fields['M'] == NULL) {
1972                 return(1);              /* You tried to save a null message! */
1973         }
1974
1975         memset(&imm, 0, sizeof(struct icalmessagemod));
1976
1977         /* Do all of our lovely back-end parsing */
1978         mime_parser(msg->cm_fields['M'],
1979                 NULL,
1980                 *ical_ctdl_set_exclusive_msgid,
1981                 NULL, NULL,
1982                 (void *)&imm,
1983                 0
1984         );
1985
1986         if (!IsEmptyStr(imm.uid)) {
1987                 if (msg->cm_fields['E'] != NULL) {
1988                         free(msg->cm_fields['E']);
1989                 }
1990                 msg->cm_fields['E'] = strdup(imm.uid);
1991                 lprintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", msg->cm_fields['E']);
1992         }
1993         if (!IsEmptyStr(imm.subject)) {
1994                 if (msg->cm_fields['U'] != NULL) {
1995                         free(msg->cm_fields['U']);
1996                 }
1997                 msg->cm_fields['U'] = strdup(imm.subject);
1998         }
1999         if (imm.dtstart > 0) {
2000                 if (msg->cm_fields['T'] != NULL) {
2001                         free(msg->cm_fields['T']);
2002                 }
2003                 msg->cm_fields['T'] = strdup("000000000000000000");
2004                 sprintf(msg->cm_fields['T'], "%ld", imm.dtstart);
2005         }
2006
2007         return(0);
2008 }
2009
2010
2011 /*
2012  * Things we need to do after saving a calendar event.
2013  */
2014 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
2015                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2016                 char *encoding, void *cbuserdata)
2017 {
2018         icalcomponent *cal;
2019
2020         /* We're only interested in calendar items here. */
2021         if (strcasecmp(cbtype, "text/calendar")) {
2022                 return;
2023         }
2024
2025         /* Hunt for the UID and drop it in
2026          * the "user data" pointer for the MIME parser.  When
2027          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2028          * to that string.
2029          */
2030         if (!strcasecmp(cbtype, "text/calendar")) {
2031                 cal = icalcomponent_new_from_string(content);
2032                 if (cal != NULL) {
2033                         ical_saving_vevent(cal);
2034                         icalcomponent_free(cal);
2035                 }
2036         }
2037 }
2038
2039
2040 /*
2041  * Things we need to do after saving a calendar event.
2042  * (This will start back end tasks such as automatic generation of invitations,
2043  * if such actions are appropriate.)
2044  */
2045 int ical_obj_aftersave(struct CtdlMessage *msg)
2046 {
2047         char roomname[ROOMNAMELEN];
2048
2049         /*
2050          * If this isn't the Calendar> room, no further action is necessary.
2051          */
2052
2053         /* First determine if this is our room */
2054         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2055         if (strcasecmp(roomname, CC->room.QRname)) {
2056                 return(0);      /* Not the Calendar room -- don't do anything. */
2057         }
2058
2059         /* It must be an RFC822 message! */
2060         if (msg->cm_format_type != 4) return(1);
2061
2062         /* Reject null messages */
2063         if (msg->cm_fields['M'] == NULL) return(1);
2064
2065         /* Now recurse through it looking for our icalendar data */
2066         mime_parser(msg->cm_fields['M'],
2067                 NULL,
2068                 *ical_obj_aftersave_backend,
2069                 NULL, NULL,
2070                 NULL,
2071                 0
2072         );
2073
2074         return(0);
2075 }
2076
2077
2078 void ical_session_startup(void) {
2079         CIT_ICAL = malloc(sizeof(struct cit_ical));
2080         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2081 }
2082
2083 void ical_session_shutdown(void) {
2084         free(CIT_ICAL);
2085 }
2086
2087
2088 /*
2089  * Back end for ical_fixed_output()
2090  */
2091 void ical_fixed_output_backend(icalcomponent *cal,
2092                         int recursion_level
2093 ) {
2094         icalcomponent *c;
2095         icalproperty *p;
2096         char buf[256];
2097
2098         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2099         if (p != NULL) {
2100                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2101         }
2102
2103         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2104         if (p != NULL) {
2105                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2106         }
2107
2108         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2109         if (p != NULL) {
2110                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2111         }
2112
2113         /* If the component has attendees, iterate through them. */
2114         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2115                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2116                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2117
2118                         /* screen name or email address */
2119                         strcpy(buf, &buf[7]);
2120                         striplt(buf);
2121                         cprintf("%s ", buf);
2122                 }
2123                 cprintf("\n");
2124         }
2125
2126         /* If the component has subcomponents, recurse through them. */
2127         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2128             (c != 0);
2129             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2130                 /* Recursively process subcomponent */
2131                 ical_fixed_output_backend(c, recursion_level+1);
2132         }
2133 }
2134
2135
2136
2137 /*
2138  * Function to output vcalendar data as plain text.  Nobody uses MSG0
2139  * anymore, so really this is just so we expose the vCard data to the full
2140  * text indexer.
2141  */
2142 void ical_fixed_output(char *ptr, int len) {
2143         icalcomponent *cal;
2144         char *stringy_cal;
2145
2146         stringy_cal = malloc(len + 1);
2147         safestrncpy(stringy_cal, ptr, len + 1);
2148         cal = icalcomponent_new_from_string(stringy_cal);
2149         free(stringy_cal);
2150
2151         if (cal == NULL) {
2152                 return;
2153         }
2154
2155         ical_dezonify(cal);
2156         ical_fixed_output_backend(cal, 0);
2157
2158         /* Free the memory we obtained from libical's constructor */
2159         icalcomponent_free(cal);
2160 }
2161
2162
2163
2164 void serv_calendar_destroy(void)
2165 {
2166         icaltimezone_free_builtin_timezones();
2167 }
2168
2169 #endif  /* CITADEL_WITH_CALENDAR_SERVICE */
2170
2171 /*
2172  * Register this module with the Citadel server.
2173  */
2174 CTDL_MODULE_INIT(calendar)
2175 {
2176         if (!threading)
2177         {
2178 #ifdef CITADEL_WITH_CALENDAR_SERVICE
2179                 CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2180                 CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2181                 CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2182                 CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2183                 CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2184                 CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2185                 CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2186                 CtdlRegisterCleanupHook(serv_calendar_destroy);
2187 #endif
2188         }
2189
2190         /* return our Subversion id for the Log */
2191         return "$Id$";
2192 }
2193