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 <libical/ical.h>
  23 #include <libcitadel.h>
  24 #include "citadel.h"
  25 #include "server.h"
  26 #include "citserver.h"
  27 #include "support.h"
  28 #include "config.h"
  29 #include "user_ops.h"
  30 #include "room_ops.h"
  31 #include "msgbase.h"
  32 #include "internet_addressing.h"
  33 #include "serv_calendar.h"
  34 #include "euidindex.h"
  35 #include "ctdl_module.h"
  36 #include "ical_dezonify.h"
  37
  38
  39
  40 struct ical_respond_data {
  41         char desired_partnum[SIZ];
  42         icalcomponent *cal;
  43 };
  44
  45
  46 /*
  47  * Utility function to create a new VCALENDAR component with some of the
  48  * required fields already set the way we like them.
  49  */
  50 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  51         icalcomponent *encaps;
  52
  53         encaps = icalcomponent_new_vcalendar();
  54         if (encaps == NULL) {
  55                 CtdlLogPrintf(CTDL_CRIT, "ERROR: could not allocate component!\n");
  56                 return NULL;
  57         }
  58
  59         /* Set the Product ID */
  60         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  61
  62         /* Set the Version Number */
  63         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  64
  65         return(encaps);
  66 }
  67
  68
  69 /*
  70  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  71  */
  72 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  73         icalcomponent *encaps;
  74
  75         /* If we're already looking at a full VCALENDAR component,
  76          * don't bother ... just return itself.
  77          */
  78         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  79                 return subcomp;
  80         }
  81
  82         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  83         encaps = icalcomponent_new_citadel_vcalendar();
  84         if (encaps == NULL) return NULL;
  85
  86         /* Encapsulate the subcomponent inside */
  87         icalcomponent_add_component(encaps, subcomp);
  88
  89         /* Return the object we just created. */
  90         return(encaps);
  91 }
  92
  93
  94
  95
  96 /*
  97  * Write a calendar object into the specified user's calendar room.
  98  * If the supplied user is NULL, this function writes the calendar object
  99  * to the currently selected room.
 100  */
 101 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 102         char *ser = NULL;
 103         icalcomponent *encaps = NULL;
 104         struct CtdlMessage *msg = NULL;
 105         icalcomponent *tmp=NULL;
 106
 107         if (cal == NULL) return;
 108
 109         /* If the supplied object is a subcomponent, encapsulate it in
 110          * a full VCALENDAR component, and save that instead.
 111          */
 112         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 113                 tmp = icalcomponent_new_clone(cal);
 114                 encaps = ical_encapsulate_subcomponent(tmp);
 115                 ical_write_to_cal(u, encaps);
 116                 icalcomponent_free(tmp);
 117                 icalcomponent_free(encaps);
 118                 return;
 119         }
 120
 121         ser = icalcomponent_as_ical_string_r(cal);
 122         if (ser == NULL) return;
 123
 124         /* If the caller supplied a user, write to that user's default calendar room */
 125         if (u) {
 126                 /* This handy API function does all the work for us. */
 127                 CtdlWriteObject(USERCALENDARROOM,       /* which room */
 128                         "text/calendar",        /* MIME type */
 129                         ser,                    /* data */
 130                         strlen(ser)+1,          /* length */
 131                         u,                      /* which user */
 132                         0,                      /* not binary */
 133                         0,                      /* don't delete others of this type */
 134                         0                       /* no flags */
 135                 );
 136         }
 137
 138         /* If the caller did not supply a user, write to the currently selected room */
 139         if (!u) {
 140                 msg = malloc(sizeof(struct CtdlMessage));
 141                 memset(msg, 0, sizeof(struct CtdlMessage));
 142                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 143                 msg->cm_anon_type = MES_NORMAL;
 144                 msg->cm_format_type = 4;
 145                 msg->cm_fields['A'] = strdup(CC->user.fullname);
 146                 msg->cm_fields['O'] = strdup(CC->room.QRname);
 147                 msg->cm_fields['N'] = strdup(config.c_nodename);
 148                 msg->cm_fields['H'] = strdup(config.c_humannode);
 149                 msg->cm_fields['M'] = malloc(strlen(ser) + 40);
 150                 strcpy(msg->cm_fields['M'], "Content-type: text/calendar\r\n\r\n");
 151                 strcat(msg->cm_fields['M'], ser);
 152
 153                 /* Now write the data */
 154                 CtdlSubmitMsg(msg, NULL, "", QP_EADDR);
 155                 CtdlFreeMessage(msg);
 156         }
 157
 158         /* In either case, now we can free the serialized calendar object */
 159         free(ser);
 160 }
 161
 162
 163 /*
 164  * Send a reply to a meeting invitation.
 165  *
 166  * 'request' is the invitation to reply to.
 167  * 'action' is the string "accept" or "decline" or "tentative".
 168  *
 169  */
 170 void ical_send_a_reply(icalcomponent *request, char *action) {
 171         icalcomponent *the_reply = NULL;
 172         icalcomponent *vevent = NULL;
 173         icalproperty *attendee = NULL;
 174         char attendee_string[SIZ];
 175         icalproperty *organizer = NULL;
 176         char organizer_string[SIZ];
 177         icalproperty *summary = NULL;
 178         char summary_string[SIZ];
 179         icalproperty *me_attend = NULL;
 180         struct recptypes *recp = NULL;
 181         icalparameter *partstat = NULL;
 182         char *serialized_reply = NULL;
 183         char *reply_message_text = NULL;
 184         struct CtdlMessage *msg = NULL;
 185         struct recptypes *valid = NULL;
 186
 187         strcpy(organizer_string, "");
 188         strcpy(summary_string, "Calendar item");
 189
 190         if (request == NULL) {
 191                 CtdlLogPrintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
 192                 return;
 193         }
 194
 195         the_reply = icalcomponent_new_clone(request);
 196         if (the_reply == NULL) {
 197                 CtdlLogPrintf(CTDL_ERR, "ERROR: cannot clone request\n");
 198                 return;
 199         }
 200
 201         /* Change the method from REQUEST to REPLY */
 202         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 203
 204         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 205         if (vevent != NULL) {
 206                 /* Hunt for attendees, removing ones that aren't us.
 207                  * (Actually, remove them all, cloning our own one so we can
 208                  * re-insert it later)
 209                  */
 210                 while (attendee = icalcomponent_get_first_property(vevent,
 211                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 212                 ) {
 213                         if (icalproperty_get_attendee(attendee)) {
 214                                 strcpy(attendee_string,
 215                                         icalproperty_get_attendee(attendee) );
 216                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 217                                         strcpy(attendee_string, &attendee_string[7]);
 218                                         striplt(attendee_string);
 219                                         recp = validate_recipients(attendee_string, NULL, 0);
 220                                         if (recp != NULL) {
 221                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 222                                                         if (me_attend) icalproperty_free(me_attend);
 223                                                         me_attend = icalproperty_new_clone(attendee);
 224                                                 }
 225                                                 free_recipients(recp);
 226                                         }
 227                                 }
 228                         }
 229                         /* Remove it... */
 230                         icalcomponent_remove_property(vevent, attendee);
 231                         icalproperty_free(attendee);
 232                 }
 233
 234                 /* We found our own address in the attendee list. */
 235                 if (me_attend) {
 236                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 237                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 238
 239                         if (!strcasecmp(action, "accept")) {
 240                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 241                         }
 242                         else if (!strcasecmp(action, "decline")) {
 243                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 244                         }
 245                         else if (!strcasecmp(action, "tentative")) {
 246                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 247                         }
 248
 249                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 250
 251                         /* Now insert it back into the vevent. */
 252                         icalcomponent_add_property(vevent, me_attend);
 253                 }
 254
 255                 /* Figure out who to send this thing to */
 256                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 257                 if (organizer != NULL) {
 258                         if (icalproperty_get_organizer(organizer)) {
 259                                 strcpy(organizer_string,
 260                                         icalproperty_get_organizer(organizer) );
 261                         }
 262                 }
 263                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 264                         strcpy(organizer_string, &organizer_string[7]);
 265                         striplt(organizer_string);
 266                 } else {
 267                         strcpy(organizer_string, "");
 268                 }
 269
 270                 /* Extract the summary string -- we'll use it as the
 271                  * message subject for the reply
 272                  */
 273                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 274                 if (summary != NULL) {
 275                         if (icalproperty_get_summary(summary)) {
 276                                 strcpy(summary_string,
 277                                         icalproperty_get_summary(summary) );
 278                         }
 279                 }
 280         }
 281
 282         /* Now generate the reply message and send it out. */
 283         serialized_reply = icalcomponent_as_ical_string_r(the_reply);
 284         icalcomponent_free(the_reply);  /* don't need this anymore */
 285         if (serialized_reply == NULL) return;
 286
 287         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 288         if (reply_message_text != NULL) {
 289                 sprintf(reply_message_text,
 290                         "Content-type: text/calendar; charset=\"utf-8\"\r\n\r\n%s\r\n",
 291                         serialized_reply
 292                 );
 293
 294                 msg = CtdlMakeMessage(&CC->user,
 295                         organizer_string,       /* to */
 296                         "",                     /* cc */
 297                         CC->room.QRname, 0, FMT_RFC822,
 298                         "",
 299                         "",
 300                         summary_string,         /* Use summary for subject */
 301                         NULL,
 302                         reply_message_text,
 303                         NULL);
 304
 305                 if (msg != NULL) {
 306                         valid = validate_recipients(organizer_string, NULL, 0);
 307                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
 308                         CtdlFreeMessage(msg);
 309                         free_recipients(valid);
 310                 }
 311         }
 312         free(serialized_reply);
 313 }
 314
 315
 316
 317 /*
 318  * Callback function for mime parser that hunts for calendar content types
 319  * and turns them into calendar objects
 320  */
 321 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 322                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 323                 char *cbid, void *cbuserdata) {
 324
 325         struct ical_respond_data *ird = NULL;
 326
 327         ird = (struct ical_respond_data *) cbuserdata;
 328
 329         /* desired_partnum can be set to "_HUNT_" to have it just look for
 330          * the first part with a content type of text/calendar.  Otherwise
 331          * we have to only process the right one.
 332          */
 333         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 334                 if (strcasecmp(partnum, ird->desired_partnum)) {
 335                         return;
 336                 }
 337         }
 338
 339         if (  (strcasecmp(cbtype, "text/calendar"))
 340            && (strcasecmp(cbtype, "application/ics")) ) {
 341                 return;
 342         }
 343
 344         if (ird->cal != NULL) {
 345                 icalcomponent_free(ird->cal);
 346                 ird->cal = NULL;
 347         }
 348
 349         ird->cal = icalcomponent_new_from_string(content);
 350 }
 351
 352
 353 /*
 354  * Respond to a meeting request.
 355  */
 356 void ical_respond(long msgnum, char *partnum, char *action) {
 357         struct CtdlMessage *msg = NULL;
 358         struct ical_respond_data ird;
 359
 360         if (
 361            (strcasecmp(action, "accept"))
 362            && (strcasecmp(action, "decline"))
 363         ) {
 364                 cprintf("%d Action must be 'accept' or 'decline'\n",
 365                         ERROR + ILLEGAL_VALUE
 366                 );
 367                 return;
 368         }
 369
 370         msg = CtdlFetchMessage(msgnum, 1);
 371         if (msg == NULL) {
 372                 cprintf("%d Message %ld not found.\n",
 373                         ERROR + ILLEGAL_VALUE,
 374                         (long)msgnum
 375                 );
 376                 return;
 377         }
 378
 379         memset(&ird, 0, sizeof ird);
 380         strcpy(ird.desired_partnum, partnum);
 381         mime_parser(msg->cm_fields['M'],
 382                 NULL,
 383                 *ical_locate_part,              /* callback function */
 384                 NULL, NULL,
 385                 (void *) &ird,                  /* user data */
 386                 0
 387         );
 388
 389         /* We're done with the incoming message, because we now have a
 390          * calendar object in memory.
 391          */
 392         CtdlFreeMessage(msg);
 393
 394         /*
 395          * Here is the real meat of this function.  Handle the event.
 396          */
 397         if (ird.cal != NULL) {
 398                 /* Save this in the user's calendar if necessary */
 399                 if (!strcasecmp(action, "accept")) {
 400                         ical_write_to_cal(&CC->user, ird.cal);
 401                 }
 402
 403                 /* Send a reply if necessary */
 404                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 405                         ical_send_a_reply(ird.cal, action);
 406                 }
 407
 408                 /* We used to delete the invitation after handling it.
 409                  * We don't do that anymore, but here is the code that handled it:
 410                  * CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 411                  */
 412
 413                 /* Free the memory we allocated and return a response. */
 414                 icalcomponent_free(ird.cal);
 415                 ird.cal = NULL;
 416                 cprintf("%d ok\n", CIT_OK);
 417                 return;
 418         }
 419         else {
 420                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 421                 return;
 422         }
 423
 424         /* should never get here */
 425 }
 426
 427
 428 /*
 429  * Figure out the UID of the calendar event being referred to in a
 430  * REPLY object.  This function is recursive.
 431  */
 432 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 433         icalcomponent *subcomponent;
 434         icalproperty *p;
 435
 436         /* If this object is a REPLY, then extract the UID. */
 437         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 438                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 439                 if (p != NULL) {
 440                         strcpy(uidbuf, icalproperty_get_comment(p));
 441                 }
 442         }
 443
 444         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 445          * UID of the reply; we want the UID of the invitation being replied to.
 446          */
 447         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 448             subcomponent != NULL;
 449             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 450                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 451         }
 452 }
 453
 454
 455 /*
 456  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 457  * locate the message containing the calendar event we're replying to, this function
 458  * gets called.  It basically just sticks the message number in a supplied buffer.
 459  */
 460 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 461         long *msgnumptr;
 462
 463         msgnumptr = (long *) data;
 464         *msgnumptr = msgnum;
 465 }
 466
 467
 468 struct original_event_container {
 469         icalcomponent *c;
 470 };
 471
 472 /*
 473  * Callback function for mime parser that hunts for calendar content types
 474  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 475  * to fetch the object being updated)
 476  */
 477 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 478                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 479                 char *cbid, void *cbuserdata) {
 480
 481         struct original_event_container *oec = NULL;
 482
 483         if (  (strcasecmp(cbtype, "text/calendar"))
 484            && (strcasecmp(cbtype, "application/ics")) ) {
 485                 return;
 486         }
 487         oec = (struct original_event_container *) cbuserdata;
 488         if (oec->c != NULL) {
 489                 icalcomponent_free(oec->c);
 490         }
 491         oec->c = icalcomponent_new_from_string(content);
 492 }
 493
 494
 495 /*
 496  * Merge updated attendee information from a REPLY into an existing event.
 497  */
 498 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 499         icalcomponent *c;
 500         icalproperty *e_attendee, *r_attendee;
 501
 502         /* First things first.  If we're not looking at a VEVENT component,
 503          * recurse through subcomponents until we find one.
 504          */
 505         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 506                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 507                     c != NULL;
 508                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 509                         ical_merge_attendee_reply(c, reply);
 510                 }
 511                 return;
 512         }
 513
 514         /* Now do the same thing with the reply.
 515          */
 516         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 517                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 518                     c != NULL;
 519                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 520                         ical_merge_attendee_reply(event, c);
 521                 }
 522                 return;
 523         }
 524
 525         /* Clone the reply, because we're going to rip its guts out. */
 526         reply = icalcomponent_new_clone(reply);
 527
 528         /* At this point we're looking at the correct subcomponents.
 529          * Iterate through the attendees looking for a match.
 530          */
 531 STARTOVER:
 532         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 533             e_attendee != NULL;
 534             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 535
 536                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 537                     r_attendee != NULL;
 538                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 539
 540                         /* Check to see if these two attendees match...
 541                          */
 542                         if (!strcasecmp(
 543                            icalproperty_get_attendee(e_attendee),
 544                            icalproperty_get_attendee(r_attendee)
 545                         )) {
 546                                 /* ...and if they do, remove the attendee from the event
 547                                  * and replace it with the attendee from the reply.  (The
 548                                  * reply's copy will have the same address, but an updated
 549                                  * status.)
 550                                  */
 551                                 icalcomponent_remove_property(event, e_attendee);
 552                                 icalproperty_free(e_attendee);
 553                                 icalcomponent_remove_property(reply, r_attendee);
 554                                 icalcomponent_add_property(event, r_attendee);
 555
 556                                 /* Since we diddled both sets of attendees, we have to start
 557                                  * the iteration over again.  This will not create an infinite
 558                                  * loop because we removed the attendee from the reply.  (That's
 559                                  * why we cloned the reply, and that's what we mean by "ripping
 560                                  * its guts out.")
 561                                  */
 562                                 goto STARTOVER;
 563                         }
 564
 565                 }
 566         }
 567
 568         /* Free the *clone* of the reply. */
 569         icalcomponent_free(reply);
 570 }
 571
 572
 573
 574
 575 /*
 576  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 577  * calendar event.  The object has already been deserialized for us; all
 578  * we have to do here is hunt for the event in our calendar, merge in the
 579  * updated attendee status, and save it again.
 580  *
 581  * This function returns 0 on success, 1 if the event was not found in the
 582  * user's calendar, or 2 if an internal error occurred.
 583  */
 584 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 585         char uid[SIZ];
 586         char hold_rm[ROOMNAMELEN];
 587         long msgnum_being_replaced = 0;
 588         struct CtdlMessage *msg = NULL;
 589         struct original_event_container oec;
 590         icalcomponent *original_event;
 591         char *serialized_event = NULL;
 592         char roomname[ROOMNAMELEN];
 593         char *message_text = NULL;
 594
 595         /* Figure out just what event it is we're dealing with */
 596         strcpy(uid, "--==<< InVaLiD uId >>==--");
 597         ical_learn_uid_of_reply(uid, cal);
 598         CtdlLogPrintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 599
 600         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 601
 602         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 603                 getroom(&CC->room, hold_rm);
 604                 CtdlLogPrintf(CTDL_CRIT, "cannot get user calendar room\n");
 605                 return(2);
 606         }
 607
 608         /*
 609          * Look in the EUID index for a message with
 610          * the Citadel EUID set to the value we're looking for.  Since
 611          * Citadel always sets the message EUID to the iCalendar UID of
 612          * the event, this will work.
 613          */
 614         msgnum_being_replaced = locate_message_by_euid(uid, &CC->room);
 615
 616         getroom(&CC->room, hold_rm);    /* return to saved room */
 617
 618         CtdlLogPrintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 619         if (msgnum_being_replaced == 0) {
 620                 return(1);                      /* no calendar event found */
 621         }
 622
 623         /* Now we know the ID of the message containing the event being updated.
 624          * We don't actually have to delete it; that'll get taken care of by the
 625          * server when we save another event with the same UID.  This just gives
 626          * us the ability to load the event into memory so we can diddle the
 627          * attendees.
 628          */
 629         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 630         if (msg == NULL) {
 631                 return(2);                      /* internal error */
 632         }
 633         oec.c = NULL;
 634         mime_parser(msg->cm_fields['M'],
 635                 NULL,
 636                 *ical_locate_original_event,    /* callback function */
 637                 NULL, NULL,
 638                 &oec,                           /* user data */
 639                 0
 640         );
 641         CtdlFreeMessage(msg);
 642
 643         original_event = oec.c;
 644         if (original_event == NULL) {
 645                 CtdlLogPrintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 646                 return(2);
 647         }
 648
 649         /* Merge the attendee's updated status into the event */
 650         ical_merge_attendee_reply(original_event, cal);
 651
 652         /* Serialize it */
 653         serialized_event = icalcomponent_as_ical_string_r(original_event);
 654         icalcomponent_free(original_event);     /* Don't need this anymore. */
 655         if (serialized_event == NULL) return(2);
 656
 657         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 658
 659         message_text = malloc(strlen(serialized_event) + SIZ);
 660         if (message_text != NULL) {
 661                 sprintf(message_text,
 662                         "Content-type: text/calendar; charset=\"utf-8\"\r\n\r\n%s\r\n",
 663                         serialized_event
 664                 );
 665
 666                 msg = CtdlMakeMessage(&CC->user,
 667                         "",                     /* No recipient */
 668                         "",                     /* No recipient */
 669                         roomname,
 670                         0, FMT_RFC822,
 671                         "",
 672                         "",
 673                         "",             /* no subject */
 674                         NULL,
 675                         message_text,
 676                         NULL);
 677
 678                 if (msg != NULL) {
 679                         CIT_ICAL->avoid_sending_invitations = 1;
 680                         CtdlSubmitMsg(msg, NULL, roomname, QP_EADDR);
 681                         CtdlFreeMessage(msg);
 682                         CIT_ICAL->avoid_sending_invitations = 0;
 683                 }
 684         }
 685         free(serialized_event);
 686         return(0);
 687 }
 688
 689
 690 /*
 691  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 692  * simply extracts the calendar object from the message, deserializes it, and
 693  * passes it up to ical_update_my_calendar_with_reply() for processing.
 694  */
 695 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 696         struct CtdlMessage *msg = NULL;
 697         struct ical_respond_data ird;
 698         int ret;
 699
 700         if (
 701            (strcasecmp(action, "update"))
 702            && (strcasecmp(action, "ignore"))
 703         ) {
 704                 cprintf("%d Action must be 'update' or 'ignore'\n",
 705                         ERROR + ILLEGAL_VALUE
 706                 );
 707                 return;
 708         }
 709
 710         msg = CtdlFetchMessage(msgnum, 1);
 711         if (msg == NULL) {
 712                 cprintf("%d Message %ld not found.\n",
 713                         ERROR + ILLEGAL_VALUE,
 714                         (long)msgnum
 715                 );
 716                 return;
 717         }
 718
 719         memset(&ird, 0, sizeof ird);
 720         strcpy(ird.desired_partnum, partnum);
 721         mime_parser(msg->cm_fields['M'],
 722                 NULL,
 723                 *ical_locate_part,              /* callback function */
 724                 NULL, NULL,
 725                 (void *) &ird,                  /* user data */
 726                 0
 727         );
 728
 729         /* We're done with the incoming message, because we now have a
 730          * calendar object in memory.
 731          */
 732         CtdlFreeMessage(msg);
 733
 734         /*
 735          * Here is the real meat of this function.  Handle the event.
 736          */
 737         if (ird.cal != NULL) {
 738                 /* Update the user's calendar if necessary */
 739                 if (!strcasecmp(action, "update")) {
 740                         ret = ical_update_my_calendar_with_reply(ird.cal);
 741                         if (ret == 0) {
 742                                 cprintf("%d Your calendar has been updated with this reply.\n",
 743                                         CIT_OK);
 744                         }
 745                         else if (ret == 1) {
 746                                 cprintf("%d This event does not exist in your calendar.\n",
 747                                         ERROR + FILE_NOT_FOUND);
 748                         }
 749                         else {
 750                                 cprintf("%d An internal error occurred.\n",
 751                                         ERROR + INTERNAL_ERROR);
 752                         }
 753                 }
 754                 else {
 755                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 756                 }
 757
 758                 /* Now that we've processed this message, we don't need it
 759                  * anymore.  So delete it.  (Don't do this anymore.)
 760                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 761                  */
 762
 763                 /* Free the memory we allocated and return a response. */
 764                 icalcomponent_free(ird.cal);
 765                 ird.cal = NULL;
 766                 return;
 767         }
 768         else {
 769                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 770                 return;
 771         }
 772
 773         /* should never get here */
 774 }
 775
 776
 777 /*
 778  * Search for a property in both the top level and in a VEVENT subcomponent
 779  */
 780 icalproperty *ical_ctdl_get_subprop(
 781                 icalcomponent *cal,
 782                 icalproperty_kind which_prop
 783 ) {
 784         icalproperty *p;
 785         icalcomponent *c;
 786
 787         p = icalcomponent_get_first_property(cal, which_prop);
 788         if (p == NULL) {
 789                 c = icalcomponent_get_first_component(cal,
 790                                                         ICAL_VEVENT_COMPONENT);
 791                 if (c != NULL) {
 792                         p = icalcomponent_get_first_property(c, which_prop);
 793                 }
 794         }
 795         return p;
 796 }
 797
 798
 799 /*
 800  * Check to see if two events overlap.  Returns nonzero if they do.
 801  * (This function is used in both Citadel and WebCit.  If you change it in
 802  * one place, change it in the other.  Better yet, put it in a library.)
 803  */
 804 int ical_ctdl_is_overlap(
 805                         struct icaltimetype t1start,
 806                         struct icaltimetype t1end,
 807                         struct icaltimetype t2start,
 808                         struct icaltimetype t2end
 809 ) {
 810
 811         if (icaltime_is_null_time(t1start)) return(0);
 812         if (icaltime_is_null_time(t2start)) return(0);
 813
 814         /* First, check for all-day events */
 815         if (t1start.is_date) {
 816                 if (!icaltime_compare_date_only(t1start, t2start)) {
 817                         return(1);
 818                 }
 819                 if (!icaltime_is_null_time(t2end)) {
 820                         if (!icaltime_compare_date_only(t1start, t2end)) {
 821                                 return(1);
 822                         }
 823                 }
 824         }
 825
 826         if (t2start.is_date) {
 827                 if (!icaltime_compare_date_only(t2start, t1start)) {
 828                         return(1);
 829                 }
 830                 if (!icaltime_is_null_time(t1end)) {
 831                         if (!icaltime_compare_date_only(t2start, t1end)) {
 832                                 return(1);
 833                         }
 834                 }
 835         }
 836
 837         /* Now check for overlaps using date *and* time. */
 838
 839         /* First, bail out if either event 1 or event 2 is missing end time. */
 840         if (icaltime_is_null_time(t1end)) return(0);
 841         if (icaltime_is_null_time(t2end)) return(0);
 842
 843         /* If event 1 ends before event 2 starts, we're in the clear. */
 844         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 845
 846         /* If event 2 ends before event 1 starts, we're also ok. */
 847         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 848
 849         /* Otherwise, they overlap. */
 850         return(1);
 851 }
 852
 853
 854
 855 /*
 856  * Phase 6 of "hunt for conflicts"
 857  * called by ical_conflicts_phase5()
 858  *
 859  * Now both the proposed and existing events have been boiled down to start and end times.
 860  * Check for overlap and output any conflicts.
 861  */
 862 void ical_conflicts_phase6(struct icaltimetype t1start,
 863                         struct icaltimetype t1end,
 864                         struct icaltimetype t2start,
 865                         struct icaltimetype t2end,
 866                         long existing_msgnum,
 867                         char *conflict_event_uid,
 868                         char *conflict_event_summary,
 869                         char *compare_uid)
 870 {
 871
 872         /* debugging cruft */
 873         //      time_t tt;
 874         //      tt = icaltime_as_timet(t1start);
 875         //      CtdlLogPrintf(CTDL_DEBUG, "PROPOSED START: %s", ctime(&tt));
 876         //      tt = icaltime_as_timet(t1end);
 877         //      CtdlLogPrintf(CTDL_DEBUG, "  PROPOSED END: %s", ctime(&tt));
 878         //      tt = icaltime_as_timet(t2start);
 879         //      CtdlLogPrintf(CTDL_DEBUG, "EXISTING START: %s", ctime(&tt));
 880         //      tt = icaltime_as_timet(t2end);
 881         //      CtdlLogPrintf(CTDL_DEBUG, "  EXISTING END: %s", ctime(&tt));
 882
 883         /* compare and output */
 884
 885         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 886                 cprintf("%ld||%s|%s|%d|\n",
 887                         existing_msgnum,
 888                         conflict_event_uid,
 889                         conflict_event_summary,
 890                         (       ((strlen(compare_uid)>0)
 891                                 &&(!strcasecmp(compare_uid,
 892                                 conflict_event_uid))) ? 1 : 0
 893                         )
 894                 );
 895         }
 896
 897 }
 898
 899
 900
 901 /*
 902  * Phase 5 of "hunt for conflicts"
 903  * Called by ical_conflicts_phase4()
 904  *
 905  * We have the proposed event boiled down to start and end times.
 906  * Now check it against an existing event.
 907  */
 908 void ical_conflicts_phase5(struct icaltimetype t1start,
 909                         struct icaltimetype t1end,
 910                         icalcomponent *existing_event,
 911                         long existing_msgnum,
 912                         char *compare_uid)
 913 {
 914         char conflict_event_uid[SIZ];
 915         char conflict_event_summary[SIZ];
 916         struct icaltimetype t2start, t2end;
 917         icalproperty *p;
 918
 919         /* recur variables */
 920         icalproperty *rrule = NULL;
 921         struct icalrecurrencetype recur;
 922         icalrecur_iterator *ritr = NULL;
 923         struct icaldurationtype dur;
 924         int num_recur = 0;
 925
 926         /* initialization */
 927         strcpy(conflict_event_uid, "");
 928         strcpy(conflict_event_summary, "");
 929         t2start = icaltime_null_time();
 930         t2end = icaltime_null_time();
 931
 932         /* existing event stuff */
 933         p = ical_ctdl_get_subprop(existing_event, ICAL_DTSTART_PROPERTY);
 934         if (p == NULL) return;
 935         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 936
 937         p = ical_ctdl_get_subprop(existing_event, ICAL_DTEND_PROPERTY);
 938         if (p != NULL) {
 939                 t2end = icalproperty_get_dtend(p);
 940                 dur = icaltime_subtract(t2end, t2start);
 941         }
 942
 943         rrule = ical_ctdl_get_subprop(existing_event, ICAL_RRULE_PROPERTY);
 944         if (rrule) {
 945                 recur = icalproperty_get_rrule(rrule);
 946                 ritr = icalrecur_iterator_new(recur, t2start);
 947                 CtdlLogPrintf(CTDL_DEBUG, "Recurrence found: %s\n", icalrecurrencetype_as_string(&recur));
 948         }
 949
 950         do {
 951                 p = ical_ctdl_get_subprop(existing_event, ICAL_UID_PROPERTY);
 952                 if (p != NULL) {
 953                         strcpy(conflict_event_uid, icalproperty_get_comment(p));
 954                 }
 955
 956                 p = ical_ctdl_get_subprop(existing_event, ICAL_SUMMARY_PROPERTY);
 957                 if (p != NULL) {
 958                         strcpy(conflict_event_summary, icalproperty_get_comment(p));
 959                 }
 960
 961                 ical_conflicts_phase6(t1start, t1end, t2start, t2end,
 962                         existing_msgnum, conflict_event_uid, conflict_event_summary, compare_uid
 963                 );
 964
 965                 if (rrule) {
 966                         t2start = icalrecur_iterator_next(ritr);
 967                         if (!icaltime_is_null_time(t2end)) {
 968                                 t2end = icaltime_add(t2start, dur);
 969                         }
 970                         ++num_recur;
 971                 }
 972
 973         } while ( (rrule) && (!icaltime_is_null_time(t2start)) && (num_recur < MAX_RECUR) );
 974         icalrecur_iterator_free(ritr);
 975         if (num_recur > 0) CtdlLogPrintf(CTDL_DEBUG, "Iterated over existing event %d times.\n", num_recur);
 976 }
 977
 978
 979
 980
 981 /*
 982  * Phase 4 of "hunt for conflicts"
 983  * Called by ical_hunt_for_conflicts_backend()
 984  *
 985  * At this point we've got it boiled down to two icalcomponent events in memory.
 986  * If they conflict, output something to the client.
 987  */
 988 void ical_conflicts_phase4(icalcomponent *proposed_event,
 989                 icalcomponent *existing_event,
 990                 long existing_msgnum)
 991 {
 992         struct icaltimetype t1start, t1end;
 993         t1start = icaltime_null_time();
 994         t1end = icaltime_null_time();
 995         icalproperty *p;
 996         char compare_uid[SIZ];
 997
 998         /* recur variables */
 999         icalproperty *rrule = NULL;
1000         struct icalrecurrencetype recur;
1001         icalrecur_iterator *ritr = NULL;
1002         struct icaldurationtype dur;
1003         int num_recur = 0;
1004
1005         /* initialization */
1006         strcpy(compare_uid, "");
1007
1008         /* proposed event stuff */
1009
1010         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTSTART_PROPERTY);
1011         if (p == NULL) return;
1012         if (p != NULL) t1start = icalproperty_get_dtstart(p);
1013
1014         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTEND_PROPERTY);
1015         if (p != NULL) {
1016                 t1end = icalproperty_get_dtend(p);
1017                 dur = icaltime_subtract(t1end, t1start);
1018         }
1019
1020         rrule = ical_ctdl_get_subprop(proposed_event, ICAL_RRULE_PROPERTY);
1021         if (rrule) {
1022                 recur = icalproperty_get_rrule(rrule);
1023                 ritr = icalrecur_iterator_new(recur, t1start);
1024                 CtdlLogPrintf(CTDL_DEBUG, "Recurrence found: %s\n", icalrecurrencetype_as_string(&recur));
1025         }
1026
1027         p = ical_ctdl_get_subprop(proposed_event, ICAL_UID_PROPERTY);
1028         if (p != NULL) {
1029                 strcpy(compare_uid, icalproperty_get_comment(p));
1030         }
1031
1032         do {
1033                 ical_conflicts_phase5(t1start, t1end, existing_event, existing_msgnum, compare_uid);
1034
1035                 if (rrule) {
1036                         t1start = icalrecur_iterator_next(ritr);
1037                         if (!icaltime_is_null_time(t1end)) {
1038                                 t1end = icaltime_add(t1start, dur);
1039                         }
1040                         ++num_recur;
1041                 }
1042
1043         } while ( (rrule) && (!icaltime_is_null_time(t1start)) && (num_recur < MAX_RECUR) );
1044         icalrecur_iterator_free(ritr);
1045         if (num_recur > 0) CtdlLogPrintf(CTDL_DEBUG, "Iterated over proposed event %d times.\n", num_recur);
1046 }
1047
1048
1049
1050 /*
1051  * Phase 3 of "hunt for conflicts"
1052  * Called by ical_hunt_for_conflicts()
1053  */
1054 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
1055         icalcomponent *proposed_event;
1056         struct CtdlMessage *msg = NULL;
1057         struct ical_respond_data ird;
1058
1059         proposed_event = (icalcomponent *)data;
1060
1061         msg = CtdlFetchMessage(msgnum, 1);
1062         if (msg == NULL) return;
1063         memset(&ird, 0, sizeof ird);
1064         strcpy(ird.desired_partnum, "_HUNT_");
1065         mime_parser(msg->cm_fields['M'],
1066                 NULL,
1067                 *ical_locate_part,              /* callback function */
1068                 NULL, NULL,
1069                 (void *) &ird,                  /* user data */
1070                 0
1071         );
1072         CtdlFreeMessage(msg);
1073
1074         if (ird.cal == NULL) return;
1075
1076         ical_conflicts_phase4(proposed_event, ird.cal, msgnum);
1077         icalcomponent_free(ird.cal);
1078 }
1079
1080
1081
1082 /*
1083  * Phase 2 of "hunt for conflicts" operation.
1084  * At this point we have a calendar object which represents the VEVENT that
1085  * is proposed for addition to the calendar.  Now hunt through the user's
1086  * calendar room, and output zero or more existing VEVENTs which conflict
1087  * with this one.
1088  */
1089 void ical_hunt_for_conflicts(icalcomponent *cal) {
1090         char hold_rm[ROOMNAMELEN];
1091
1092         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1093
1094         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
1095                 getroom(&CC->room, hold_rm);
1096                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
1097                 return;
1098         }
1099
1100         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
1101
1102         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1103                 NULL,
1104                 NULL,
1105                 ical_hunt_for_conflicts_backend,
1106                 (void *) cal
1107         );
1108
1109         cprintf("000\n");
1110         getroom(&CC->room, hold_rm);    /* return to saved room */
1111
1112 }
1113
1114
1115
1116 /*
1117  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1118  */
1119 void ical_conflicts(long msgnum, char *partnum) {
1120         struct CtdlMessage *msg = NULL;
1121         struct ical_respond_data ird;
1122
1123         msg = CtdlFetchMessage(msgnum, 1);
1124         if (msg == NULL) {
1125                 cprintf("%d Message %ld not found.\n",
1126                         ERROR + ILLEGAL_VALUE,
1127                         (long)msgnum
1128                 );
1129                 return;
1130         }
1131
1132         memset(&ird, 0, sizeof ird);
1133         strcpy(ird.desired_partnum, partnum);
1134         mime_parser(msg->cm_fields['M'],
1135                 NULL,
1136                 *ical_locate_part,              /* callback function */
1137                 NULL, NULL,
1138                 (void *) &ird,                  /* user data */
1139                 0
1140         );
1141
1142         CtdlFreeMessage(msg);
1143
1144         if (ird.cal != NULL) {
1145                 ical_hunt_for_conflicts(ird.cal);
1146                 icalcomponent_free(ird.cal);
1147                 return;
1148         }
1149         else {
1150                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1151                 return;
1152         }
1153
1154         /* should never get here */
1155 }
1156
1157
1158
1159 /*
1160  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1161  */
1162 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1163         icalproperty *p;
1164         icalvalue *v;
1165         struct icalperiodtype my_period;
1166
1167         if (cal == NULL) return;
1168         my_period = icalperiodtype_null_period();
1169
1170         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1171                 ical_add_to_freebusy(fb,
1172                         icalcomponent_get_first_component(
1173                                 cal, ICAL_VEVENT_COMPONENT
1174                         )
1175                 );
1176                 return;
1177         }
1178
1179         /* If this event is not opaque, the user isn't publishing it as
1180          * busy time, so don't bother doing anything else.
1181          */
1182         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1183         if (p != NULL) {
1184                 v = icalproperty_get_value(p);
1185                 if (v != NULL) {
1186                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1187                                 return;
1188                         }
1189                 }
1190         }
1191
1192         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1193         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1194         if (p != NULL) {
1195                 my_period.start = icalproperty_get_dtstart(p);
1196         }
1197
1198         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1199         if (p != NULL) {
1200                 my_period.end = icalproperty_get_dtstart(p);
1201         }
1202
1203         /* Now add it. */
1204         icalcomponent_add_property(fb,
1205                 icalproperty_new_freebusy(my_period)
1206         );
1207
1208         /* Make sure the DTSTART property of the freebusy *list* is set to
1209          * the DTSTART property of the *earliest event*.
1210          */
1211         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1212         if (p == NULL) {
1213                 icalcomponent_set_dtstart(fb,
1214                         icalcomponent_get_dtstart(cal) );
1215         }
1216         else {
1217                 if (icaltime_compare(
1218                         icalcomponent_get_dtstart(cal),
1219                         icalcomponent_get_dtstart(fb)
1220                    ) < 0) {
1221                         icalcomponent_set_dtstart(fb,
1222                                 icalcomponent_get_dtstart(cal) );
1223                 }
1224         }
1225
1226         /* Make sure the DTEND property of the freebusy *list* is set to
1227          * the DTEND property of the *latest event*.
1228          */
1229         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1230         if (p == NULL) {
1231                 icalcomponent_set_dtend(fb,
1232                         icalcomponent_get_dtend(cal) );
1233         }
1234         else {
1235                 if (icaltime_compare(
1236                         icalcomponent_get_dtend(cal),
1237                         icalcomponent_get_dtend(fb)
1238                    ) > 0) {
1239                         icalcomponent_set_dtend(fb,
1240                                 icalcomponent_get_dtend(cal) );
1241                 }
1242         }
1243
1244 }
1245
1246
1247
1248 /*
1249  * Backend for ical_freebusy()
1250  *
1251  * This function simply loads the messages in the user's calendar room,
1252  * which contain VEVENTs, then strips them of all non-freebusy data, and
1253  * adds them to the supplied VCALENDAR.
1254  *
1255  */
1256 void ical_freebusy_backend(long msgnum, void *data) {
1257         icalcomponent *cal;
1258         struct CtdlMessage *msg = NULL;
1259         struct ical_respond_data ird;
1260
1261         cal = (icalcomponent *)data;
1262
1263         msg = CtdlFetchMessage(msgnum, 1);
1264         if (msg == NULL) return;
1265         memset(&ird, 0, sizeof ird);
1266         strcpy(ird.desired_partnum, "_HUNT_");
1267         mime_parser(msg->cm_fields['M'],
1268                 NULL,
1269                 *ical_locate_part,              /* callback function */
1270                 NULL, NULL,
1271                 (void *) &ird,                  /* user data */
1272                 0
1273         );
1274         CtdlFreeMessage(msg);
1275
1276         if (ird.cal == NULL) return;
1277
1278         ical_add_to_freebusy(cal, ird.cal);
1279
1280         /* Now free the memory. */
1281         icalcomponent_free(ird.cal);
1282 }
1283
1284
1285
1286 /*
1287  * Grab another user's free/busy times
1288  */
1289 void ical_freebusy(char *who) {
1290         struct ctdluser usbuf;
1291         char calendar_room_name[ROOMNAMELEN];
1292         char hold_rm[ROOMNAMELEN];
1293         char *serialized_request = NULL;
1294         icalcomponent *encaps = NULL;
1295         icalcomponent *fb = NULL;
1296         int found_user = (-1);
1297         struct recptypes *recp = NULL;
1298         char buf[256];
1299         char host[256];
1300         char type[256];
1301         int i = 0;
1302         int config_lines = 0;
1303
1304         /* First try an exact match. */
1305         found_user = getuser(&usbuf, who);
1306
1307         /* If not found, try it as an unqualified email address. */
1308         if (found_user != 0) {
1309                 strcpy(buf, who);
1310                 recp = validate_recipients(buf, NULL, 0);
1311                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1312                 if (recp != NULL) {
1313                         if (recp->num_local == 1) {
1314                                 found_user = getuser(&usbuf, recp->recp_local);
1315                         }
1316                         free_recipients(recp);
1317                 }
1318         }
1319
1320         /* If still not found, try it as an address qualified with the
1321          * primary FQDN of this Citadel node.
1322          */
1323         if (found_user != 0) {
1324                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1325                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1326                 recp = validate_recipients(buf, NULL, 0);
1327                 if (recp != NULL) {
1328                         if (recp->num_local == 1) {
1329                                 found_user = getuser(&usbuf, recp->recp_local);
1330                         }
1331                         free_recipients(recp);
1332                 }
1333         }
1334
1335         /* Still not found?  Try qualifying it with every domain we
1336          * might have addresses in.
1337          */
1338         if (found_user != 0) {
1339                 config_lines = num_tokens(inetcfg, '\n');
1340                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1341                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1342                         extract_token(host, buf, 0, '|', sizeof host);
1343                         extract_token(type, buf, 1, '|', sizeof type);
1344
1345                         if ( (!strcasecmp(type, "localhost"))
1346                            || (!strcasecmp(type, "directory")) ) {
1347                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1348                                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1349                                 recp = validate_recipients(buf, NULL, 0);
1350                                 if (recp != NULL) {
1351                                         if (recp->num_local == 1) {
1352                                                 found_user = getuser(&usbuf, recp->recp_local);
1353                                         }
1354                                         free_recipients(recp);
1355                                 }
1356                         }
1357                 }
1358         }
1359
1360         if (found_user != 0) {
1361                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1362                 return;
1363         }
1364
1365         MailboxName(calendar_room_name, sizeof calendar_room_name,
1366                 &usbuf, USERCALENDARROOM);
1367
1368         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1369
1370         if (getroom(&CC->room, calendar_room_name) != 0) {
1371                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1372                 getroom(&CC->room, hold_rm);
1373                 return;
1374         }
1375
1376         /* Create a VFREEBUSY subcomponent */
1377         CtdlLogPrintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1378         fb = icalcomponent_new_vfreebusy();
1379         if (fb == NULL) {
1380                 cprintf("%d Internal error: cannot allocate memory.\n",
1381                         ERROR + INTERNAL_ERROR);
1382                 getroom(&CC->room, hold_rm);
1383                 return;
1384         }
1385
1386         /* Set the method to PUBLISH */
1387         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1388
1389         /* Set the DTSTAMP to right now. */
1390         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1391
1392         /* Add the user's email address as ORGANIZER */
1393         sprintf(buf, "MAILTO:%s", who);
1394         if (strchr(buf, '@') == NULL) {
1395                 strcat(buf, "@");
1396                 strcat(buf, config.c_fqdn);
1397         }
1398         for (i=0; buf[i]; ++i) {
1399                 if (buf[i]==' ') buf[i] = '_';
1400         }
1401         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1402
1403         /* Add busy time from events */
1404         CtdlLogPrintf(CTDL_DEBUG, "Adding busy time from events\n");
1405         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1406
1407         /* If values for DTSTART and DTEND are still not present, set them
1408          * to yesterday and tomorrow as default values.
1409          */
1410         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1411                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1412         }
1413         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1414                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1415         }
1416
1417         /* Put the freebusy component into the calendar component */
1418         CtdlLogPrintf(CTDL_DEBUG, "Encapsulating\n");
1419         encaps = ical_encapsulate_subcomponent(fb);
1420         if (encaps == NULL) {
1421                 icalcomponent_free(fb);
1422                 cprintf("%d Internal error: cannot allocate memory.\n",
1423                         ERROR + INTERNAL_ERROR);
1424                 getroom(&CC->room, hold_rm);
1425                 return;
1426         }
1427
1428         /* Set the method to PUBLISH */
1429         CtdlLogPrintf(CTDL_DEBUG, "Setting method\n");
1430         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1431
1432         /* Serialize it */
1433         CtdlLogPrintf(CTDL_DEBUG, "Serializing\n");
1434         serialized_request = icalcomponent_as_ical_string_r(encaps);
1435         icalcomponent_free(encaps);     /* Don't need this anymore. */
1436
1437         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1438         if (serialized_request != NULL) {
1439                 client_write(serialized_request, strlen(serialized_request));
1440                 free(serialized_request);
1441         }
1442         cprintf("\n000\n");
1443
1444         /* Go back to the room from which we came... */
1445         getroom(&CC->room, hold_rm);
1446 }
1447
1448
1449
1450 /*
1451  * Backend for ical_getics()
1452  *
1453  * This is a ForEachMessage() callback function that searches the current room
1454  * for calendar events and adds them each into one big calendar component.
1455  */
1456 void ical_getics_backend(long msgnum, void *data) {
1457         icalcomponent *encaps, *c;
1458         struct CtdlMessage *msg = NULL;
1459         struct ical_respond_data ird;
1460
1461         encaps = (icalcomponent *)data;
1462         if (encaps == NULL) return;
1463
1464         /* Look for the calendar event... */
1465
1466         msg = CtdlFetchMessage(msgnum, 1);
1467         if (msg == NULL) return;
1468         memset(&ird, 0, sizeof ird);
1469         strcpy(ird.desired_partnum, "_HUNT_");
1470         mime_parser(msg->cm_fields['M'],
1471                 NULL,
1472                 *ical_locate_part,              /* callback function */
1473                 NULL, NULL,
1474                 (void *) &ird,                  /* user data */
1475                 0
1476         );
1477         CtdlFreeMessage(msg);
1478
1479         if (ird.cal == NULL) return;
1480
1481         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1482          * are responsible for "the_request"'s memory -- it will be freed
1483          * when we free "encaps".
1484          */
1485
1486         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1487          * in.  This will almost never happen.
1488          */
1489         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1490                 icalcomponent_add_component(encaps, ird.cal);
1491         }
1492         /*
1493          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1494          * and other components encapsulated inside, we have to extract them.
1495          */
1496         else {
1497                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1498                     (c != NULL);
1499                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1500
1501                         /* For VTIMEZONE components, suppress duplicates of the same tzid */
1502
1503                         if (icalcomponent_isa(c) == ICAL_VTIMEZONE_COMPONENT) {
1504                                 icalproperty *p = icalcomponent_get_first_property(c, ICAL_TZID_PROPERTY);
1505                                 if (p) {
1506                                         const char *tzid = icalproperty_get_tzid(p);
1507                                         if (!icalcomponent_get_timezone(encaps, tzid)) {
1508                                                 icalcomponent_add_component(encaps,
1509                                                                         icalcomponent_new_clone(c));
1510                                         }
1511                                 }
1512                         }
1513
1514                         /* All other types of components can go in verbatim */
1515                         else {
1516                                 icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1517                         }
1518                 }
1519                 icalcomponent_free(ird.cal);
1520         }
1521 }
1522
1523
1524
1525 /*
1526  * Retrieve all of the calendar items in the current room, and output them
1527  * as a single icalendar object.
1528  */
1529 void ical_getics(void)
1530 {
1531         icalcomponent *encaps = NULL;
1532         char *ser = NULL;
1533
1534         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1535            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1536                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1537                 return;         /* Not an iCalendar-centric room */
1538         }
1539
1540         encaps = icalcomponent_new_vcalendar();
1541         if (encaps == NULL) {
1542                 CtdlLogPrintf(CTDL_DEBUG, "ERROR: could not allocate component!\n");
1543                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1544                 return;
1545         }
1546
1547         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1548
1549         /* Set the Product ID */
1550         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1551
1552         /* Set the Version Number */
1553         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1554
1555         /* Set the method to PUBLISH */
1556         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1557
1558         /* Now go through the room encapsulating all calendar items. */
1559         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1560                 NULL,
1561                 NULL,
1562                 ical_getics_backend,
1563                 (void *) encaps
1564         );
1565
1566         ser = icalcomponent_as_ical_string_r(encaps);
1567         icalcomponent_free(encaps);                     /* Don't need this anymore. */
1568         client_write(ser, strlen(ser));
1569         free(ser);
1570         cprintf("\n000\n");
1571 }
1572
1573
1574 /*
1575  * Delete all of the calendar items in the current room, and replace them
1576  * with calendar items from a client-supplied data stream.
1577  */
1578 void ical_putics(void)
1579 {
1580         char *calstream = NULL;
1581         icalcomponent *cal;
1582         icalcomponent *c;
1583
1584         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1585            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1586                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1587                 return;         /* Not an iCalendar-centric room */
1588         }
1589
1590         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1591                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1592                 return;
1593         }
1594
1595         cprintf("%d Transmit data now\n", SEND_LISTING);
1596         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0, 0);
1597         if (calstream == NULL) {
1598                 return;
1599         }
1600
1601         cal = icalcomponent_new_from_string(calstream);
1602         free(calstream);
1603
1604         /* We got our data stream -- now do something with it. */
1605
1606         /* Delete the existing messages in the room, because we are replacing
1607          * the entire calendar with an entire new (or updated) calendar.
1608          * (Careful: this opens an S_ROOMS critical section!)
1609          */
1610         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1611
1612         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1613          * in.  This will almost never happen.
1614          */
1615         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1616                 ical_write_to_cal(NULL, cal);
1617         }
1618         /*
1619          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1620          * and other components encapsulated inside, we have to extract them.
1621          */
1622         else {
1623                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1624                     (c != NULL);
1625                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1626                         ical_write_to_cal(NULL, c);
1627                 }
1628         }
1629
1630         icalcomponent_free(cal);
1631 }
1632
1633
1634 /*
1635  * All Citadel calendar commands from the client come through here.
1636  */
1637 void cmd_ical(char *argbuf)
1638 {
1639         char subcmd[64];
1640         long msgnum;
1641         char partnum[256];
1642         char action[256];
1643         char who[256];
1644
1645         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1646
1647         /* Allow "test" and "freebusy" subcommands without logging in. */
1648
1649         if (!strcasecmp(subcmd, "test")) {
1650                 cprintf("%d This server supports calendaring\n", CIT_OK);
1651                 return;
1652         }
1653
1654         if (!strcasecmp(subcmd, "freebusy")) {
1655                 extract_token(who, argbuf, 1, '|', sizeof who);
1656                 ical_freebusy(who);
1657                 return;
1658         }
1659
1660         if (!strcasecmp(subcmd, "sgi")) {
1661                 CIT_ICAL->server_generated_invitations =
1662                         (extract_int(argbuf, 1) ? 1 : 0) ;
1663                 cprintf("%d %d\n",
1664                         CIT_OK, CIT_ICAL->server_generated_invitations);
1665                 return;
1666         }
1667
1668         if (CtdlAccessCheck(ac_logged_in)) return;
1669
1670         if (!strcasecmp(subcmd, "respond")) {
1671                 msgnum = extract_long(argbuf, 1);
1672                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1673                 extract_token(action, argbuf, 3, '|', sizeof action);
1674                 ical_respond(msgnum, partnum, action);
1675                 return;
1676         }
1677
1678         if (!strcasecmp(subcmd, "handle_rsvp")) {
1679                 msgnum = extract_long(argbuf, 1);
1680                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1681                 extract_token(action, argbuf, 3, '|', sizeof action);
1682                 ical_handle_rsvp(msgnum, partnum, action);
1683                 return;
1684         }
1685
1686         if (!strcasecmp(subcmd, "conflicts")) {
1687                 msgnum = extract_long(argbuf, 1);
1688                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1689                 ical_conflicts(msgnum, partnum);
1690                 return;
1691         }
1692
1693         if (!strcasecmp(subcmd, "getics")) {
1694                 ical_getics();
1695                 return;
1696         }
1697
1698         if (!strcasecmp(subcmd, "putics")) {
1699                 ical_putics();
1700                 return;
1701         }
1702
1703         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1704 }
1705
1706
1707
1708 /*
1709  * We don't know if the calendar room exists so we just create it at login
1710  */
1711 void ical_create_room(void)
1712 {
1713         struct ctdlroom qr;
1714         struct visit vbuf;
1715
1716         /* Create the calendar room if it doesn't already exist */
1717         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1718
1719         /* Set expiration policy to manual; otherwise objects will be lost! */
1720         if (lgetroom(&qr, USERCALENDARROOM)) {
1721                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1722                 return;
1723         }
1724         qr.QRep.expire_mode = EXPIRE_MANUAL;
1725         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1726         lputroom(&qr);
1727
1728         /* Set the view to a calendar view */
1729         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1730         vbuf.v_view = VIEW_CALENDAR;
1731         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1732
1733         /* Create the tasks list room if it doesn't already exist */
1734         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1735
1736         /* Set expiration policy to manual; otherwise objects will be lost! */
1737         if (lgetroom(&qr, USERTASKSROOM)) {
1738                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1739                 return;
1740         }
1741         qr.QRep.expire_mode = EXPIRE_MANUAL;
1742         qr.QRdefaultview = VIEW_TASKS;
1743         lputroom(&qr);
1744
1745         /* Set the view to a task list view */
1746         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1747         vbuf.v_view = VIEW_TASKS;
1748         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1749
1750         /* Create the notes room if it doesn't already exist */
1751         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1752
1753         /* Set expiration policy to manual; otherwise objects will be lost! */
1754         if (lgetroom(&qr, USERNOTESROOM)) {
1755                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1756                 return;
1757         }
1758         qr.QRep.expire_mode = EXPIRE_MANUAL;
1759         qr.QRdefaultview = VIEW_NOTES;
1760         lputroom(&qr);
1761
1762         /* Set the view to a notes view */
1763         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1764         vbuf.v_view = VIEW_NOTES;
1765         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1766
1767         return;
1768 }
1769
1770
1771 /*
1772  * ical_send_out_invitations() is called by ical_saving_vevent() when it finds a VEVENT.
1773  *
1774  * top_level_cal is the highest available level calendar object.
1775  * cal is the subcomponent containing the VEVENT.
1776  *
1777  * Note: if you change the encapsulation code here, change it in WebCit's ical_encapsulate_subcomponent()
1778  */
1779 void ical_send_out_invitations(icalcomponent *top_level_cal, icalcomponent *cal) {
1780         icalcomponent *the_request = NULL;
1781         char *serialized_request = NULL;
1782         icalcomponent *encaps = NULL;
1783         char *request_message_text = NULL;
1784         struct CtdlMessage *msg = NULL;
1785         struct recptypes *valid = NULL;
1786         char attendees_string[SIZ];
1787         int num_attendees = 0;
1788         char this_attendee[256];
1789         icalproperty *attendee = NULL;
1790         char summary_string[SIZ];
1791         icalproperty *summary = NULL;
1792         size_t reqsize;
1793         icalproperty *p;
1794         struct icaltimetype t;
1795         icaltimezone *attached_zones[5] = { NULL, NULL, NULL, NULL, NULL };
1796         int i;
1797         icaltimezone *z;
1798         int num_zones_attached = 0;
1799         int zone_already_attached;
1800
1801         if (cal == NULL) {
1802                 CtdlLogPrintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1803                 return;
1804         }
1805
1806
1807         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1808         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1809                 ical_send_out_invitations(top_level_cal,
1810                         icalcomponent_get_first_component(
1811                                 cal, ICAL_VEVENT_COMPONENT
1812                         )
1813                 );
1814                 return;
1815         }
1816
1817         /* Clone the event */
1818         the_request = icalcomponent_new_clone(cal);
1819         if (the_request == NULL) {
1820                 CtdlLogPrintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1821                 return;
1822         }
1823
1824         /* Extract the summary string -- we'll use it as the
1825          * message subject for the request
1826          */
1827         strcpy(summary_string, "Meeting request");
1828         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1829         if (summary != NULL) {
1830                 if (icalproperty_get_summary(summary)) {
1831                         strcpy(summary_string,
1832                                 icalproperty_get_summary(summary) );
1833                 }
1834         }
1835
1836         /* Determine who the recipients of this message are (the attendees) */
1837         strcpy(attendees_string, "");
1838         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1839                 if (icalproperty_get_attendee(attendee)) {
1840                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1841                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1842                                 strcpy(this_attendee, &this_attendee[7]);
1843
1844                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1845                                         snprintf(&attendees_string[strlen(attendees_string)],
1846                                                 sizeof(attendees_string) - strlen(attendees_string),
1847                                                 "%s, ",
1848                                                 this_attendee
1849                                         );
1850                                         ++num_attendees;
1851                                 }
1852                         }
1853                 }
1854         }
1855
1856         CtdlLogPrintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1857
1858         /* If there are no attendees, there are no invitations to send, so...
1859          * don't bother putting one together!  Punch out, Maverick!
1860          */
1861         if (num_attendees == 0) {
1862                 icalcomponent_free(the_request);
1863                 return;
1864         }
1865
1866         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1867         encaps = icalcomponent_new_vcalendar();
1868         if (encaps == NULL) {
1869                 CtdlLogPrintf(CTDL_DEBUG, "ERROR: could not allocate component!\n");
1870                 icalcomponent_free(the_request);
1871                 return;
1872         }
1873
1874         /* Set the Product ID */
1875         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1876
1877         /* Set the Version Number */
1878         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1879
1880         /* Set the method to REQUEST */
1881         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1882
1883         /* Look for properties containing timezone parameters, to see if we need to attach VTIMEZONEs */
1884         for (p = icalcomponent_get_first_property(the_request, ICAL_ANY_PROPERTY);
1885              p != NULL;
1886              p = icalcomponent_get_next_property(the_request, ICAL_ANY_PROPERTY))
1887         {
1888                 if ( (icalproperty_isa(p) == ICAL_COMPLETED_PROPERTY)
1889                   || (icalproperty_isa(p) == ICAL_CREATED_PROPERTY)
1890                   || (icalproperty_isa(p) == ICAL_DATEMAX_PROPERTY)
1891                   || (icalproperty_isa(p) == ICAL_DATEMIN_PROPERTY)
1892                   || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
1893                   || (icalproperty_isa(p) == ICAL_DTSTAMP_PROPERTY)
1894                   || (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
1895                   || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
1896                   || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
1897                   || (icalproperty_isa(p) == ICAL_LASTMODIFIED_PROPERTY)
1898                   || (icalproperty_isa(p) == ICAL_MAXDATE_PROPERTY)
1899                   || (icalproperty_isa(p) == ICAL_MINDATE_PROPERTY)
1900                   || (icalproperty_isa(p) == ICAL_RECURRENCEID_PROPERTY)
1901                 ) {
1902                         t = icalproperty_get_dtstart(p);        // it's safe to use dtstart for all of them
1903                         CtdlLogPrintf(CTDL_DEBUG, "Found an icaltimetype: %s\n",
1904                                 icaltime_as_ical_string(t)
1905                         );
1906
1907                         /* First see if there's a timezone attached to the data structure itself */
1908                         if (icaltime_is_utc(t)) {
1909                                 z = icaltimezone_get_utc_timezone();
1910                         }
1911                         else {
1912                                 z = icaltime_get_timezone(t);
1913                         }
1914                         if (z) CtdlLogPrintf(CTDL_DEBUG, "Timezone is present in data structure\n");
1915
1916                         /* If not, try to determine the tzid from the parameter using attached zones */
1917                         if (!z) {
1918                                 z = icalcomponent_get_timezone(top_level_cal,
1919                                         icalparameter_get_tzid(
1920                                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
1921                                         )
1922                                 );
1923                                 if (z) CtdlLogPrintf(CTDL_DEBUG, "Timezone was found in attached zones\n");
1924                         }
1925
1926                         /* Still no good?  Try our internal database */
1927                         if (!z) {
1928                                 z = icaltimezone_get_builtin_timezone_from_tzid(
1929                                         icalparameter_get_tzid(
1930                                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
1931                                         )
1932                                 );
1933                                 if (z) CtdlLogPrintf(CTDL_DEBUG, "Timezone was found in internal db\n");
1934                         }
1935
1936                         if (z) {
1937                                 CtdlLogPrintf(CTDL_DEBUG, "Have valid timezone, need to attach it.\n");
1938
1939                                 zone_already_attached = 0;
1940                                 for (i=0; i<5; ++i) {
1941                                         if (z == attached_zones[i]) {
1942                                                 ++zone_already_attached;
1943                                                 CtdlLogPrintf(CTDL_DEBUG, "zone already attached!!\n");
1944                                         }
1945                                 }
1946                                 if ((!zone_already_attached) && (num_zones_attached < 5)) {
1947                                         CtdlLogPrintf(CTDL_DEBUG, "attach zone %d\n", num_zones_attached);
1948                                         attached_zones[num_zones_attached++] = z;
1949                                 }
1950
1951                                 icalproperty_set_parameter(p,
1952                                         icalparameter_new_tzid(icaltimezone_get_tzid(z))
1953                                 );
1954                         }
1955                 }
1956         }
1957
1958         /* Encapsulate any timezones we need */
1959         if (num_zones_attached > 0) for (i=0; i<num_zones_attached; ++i) {
1960                 icalcomponent *zc;
1961                 zc = icalcomponent_new_clone(icaltimezone_get_component(attached_zones[i]));
1962                 icalcomponent_add_component(encaps, zc);
1963         }
1964
1965         /* Here we go: encapsulate the VEVENT into the VCALENDAR.  We now no longer
1966          * are responsible for "the_request"'s memory -- it will be freed
1967          * when we free "encaps".
1968          */
1969         icalcomponent_add_component(encaps, the_request);
1970
1971         /* Serialize it */
1972         serialized_request = icalcomponent_as_ical_string_r(encaps);
1973         icalcomponent_free(encaps);     /* Don't need this anymore. */
1974         if (serialized_request == NULL) return;
1975
1976         CtdlLogPrintf(CTDL_DEBUG, "SENDING INVITATIONS:\n%s\n", serialized_request);
1977
1978         reqsize = strlen(serialized_request) + SIZ;
1979         request_message_text = malloc(reqsize);
1980         if (request_message_text != NULL) {
1981                 snprintf(request_message_text, reqsize,
1982                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1983                         serialized_request
1984                 );
1985
1986                 msg = CtdlMakeMessage(&CC->user,
1987                         "",                     /* No single recipient here */
1988                         "",                     /* No single recipient here */
1989                         CC->room.QRname, 0, FMT_RFC822,
1990                         "",
1991                         "",
1992                         summary_string,         /* Use summary for subject */
1993                         NULL,
1994                         request_message_text,
1995                         NULL);
1996
1997                 if (msg != NULL) {
1998                         valid = validate_recipients(attendees_string, NULL, 0);
1999                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
2000                         CtdlFreeMessage(msg);
2001                         free_recipients(valid);
2002                 }
2003         }
2004         free(serialized_request);
2005 }
2006
2007
2008 /*
2009  * When a calendar object is being saved, determine whether it's a VEVENT
2010  * and the user saving it is the organizer.  If so, send out invitations
2011  * to any listed attendees.
2012  *
2013  * This function is recursive.  The caller can simply supply the same object
2014  * as both arguments.  When it recurses it will alter the second argument
2015  * while holding on to the top level object.  This allows us to go back and
2016  * grab things like time zones which might be attached.
2017  *
2018  */
2019 void ical_saving_vevent(icalcomponent *top_level_cal, icalcomponent *cal) {
2020         icalcomponent *c;
2021         icalproperty *organizer = NULL;
2022         char organizer_string[SIZ];
2023
2024         CtdlLogPrintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
2025
2026         /* Don't send out invitations unless the client wants us to. */
2027         if (CIT_ICAL->server_generated_invitations == 0) {
2028                 return;
2029         }
2030
2031         /* Don't send out invitations if we've been asked not to. */
2032         if (CIT_ICAL->avoid_sending_invitations > 0) {
2033                 return;
2034         }
2035
2036         strcpy(organizer_string, "");
2037         /*
2038          * The VEVENT subcomponent is the one we're interested in.
2039          * Send out invitations if, and only if, this user is the Organizer.
2040          */
2041         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
2042                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
2043                 if (organizer != NULL) {
2044                         if (icalproperty_get_organizer(organizer)) {
2045                                 strcpy(organizer_string,
2046                                         icalproperty_get_organizer(organizer));
2047                         }
2048                 }
2049                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
2050                         strcpy(organizer_string, &organizer_string[7]);
2051                         striplt(organizer_string);
2052                         /*
2053                          * If the user saving the event is listed as the
2054                          * organizer, then send out invitations.
2055                          */
2056                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
2057                                 ical_send_out_invitations(top_level_cal, cal);
2058                         }
2059                 }
2060         }
2061
2062         /* If the component has subcomponents, recurse through them. */
2063         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2064             (c != NULL);
2065             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2066                 /* Recursively process subcomponent */
2067                 ical_saving_vevent(top_level_cal, c);
2068         }
2069
2070 }
2071
2072
2073
2074 /*
2075  * Back end for ical_obj_beforesave()
2076  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
2077  * the summary of the event (becomes message subject),
2078  * and the start time (becomes message date/time).
2079  */
2080 void ical_obj_beforesave_backend(char *name, char *filename, char *partnum,
2081                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2082                 char *encoding, char *cbid, void *cbuserdata)
2083 {
2084         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
2085         icalproperty *p;
2086         char new_uid[256] = "";
2087         char buf[1024] = "";
2088         struct CtdlMessage *msg = (struct CtdlMessage *) cbuserdata;
2089
2090         if (!msg) return;
2091
2092         /* We're only interested in calendar data. */
2093         if (  (strcasecmp(cbtype, "text/calendar"))
2094            && (strcasecmp(cbtype, "application/ics")) ) {
2095                 return;
2096         }
2097
2098         /* Hunt for the UID and drop it in
2099          * the "user data" pointer for the MIME parser.  When
2100          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2101          * to that string.
2102          */
2103         whole_cal = icalcomponent_new_from_string(content);
2104         cal = whole_cal;
2105         if (cal != NULL) {
2106                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
2107                         nested_event = icalcomponent_get_first_component(
2108                                 cal, ICAL_VEVENT_COMPONENT);
2109                         if (nested_event != NULL) {
2110                                 cal = nested_event;
2111                         }
2112                         else {
2113                                 nested_todo = icalcomponent_get_first_component(
2114                                         cal, ICAL_VTODO_COMPONENT);
2115                                 if (nested_todo != NULL) {
2116                                         cal = nested_todo;
2117                                 }
2118                         }
2119                 }
2120
2121                 if (cal != NULL) {
2122
2123                         /* Set the message EUID to the iCalendar UID */
2124
2125                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2126                         if (p == NULL) {
2127                                 /* If there's no uid we must generate one */
2128                                 generate_uuid(new_uid);
2129                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
2130                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2131                         }
2132                         if (p != NULL) {
2133                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2134                                 if (!IsEmptyStr(buf)) {
2135                                         if (msg->cm_fields['E'] != NULL) {
2136                                                 free(msg->cm_fields['E']);
2137                                         }
2138                                         msg->cm_fields['E'] = strdup(buf);
2139                                         CtdlLogPrintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", buf);
2140                                 }
2141                         }
2142
2143                         /* Set the message subject to the iCalendar summary */
2144
2145                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
2146                         if (p != NULL) {
2147                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2148                                 if (!IsEmptyStr(buf)) {
2149                                         if (msg->cm_fields['U'] != NULL) {
2150                                                 free(msg->cm_fields['U']);
2151                                         }
2152                                         msg->cm_fields['U'] = strdup(buf);
2153                                 }
2154                         }
2155
2156                         /* Set the message date/time to the iCalendar start time */
2157
2158                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
2159                         if (p != NULL) {
2160                                 time_t idtstart;
2161                                 idtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
2162                                 if (idtstart > 0) {
2163                                         if (msg->cm_fields['T'] != NULL) {
2164                                                 free(msg->cm_fields['T']);
2165                                         }
2166                                         msg->cm_fields['T'] = strdup("000000000000000000");
2167                                         sprintf(msg->cm_fields['T'], "%ld", idtstart);
2168                                 }
2169                         }
2170
2171                 }
2172                 icalcomponent_free(cal);
2173                 if (whole_cal != cal) {
2174                         icalcomponent_free(whole_cal);
2175                 }
2176         }
2177 }
2178
2179
2180
2181
2182 /*
2183  * See if we need to prevent the object from being saved (we don't allow
2184  * MIME types other than text/calendar in "calendar" or "tasks" rooms).
2185  *
2186  * If the message is being saved, we also set various message header fields
2187  * using data found in the iCalendar object.
2188  */
2189 int ical_obj_beforesave(struct CtdlMessage *msg)
2190 {
2191         /* First determine if this is a calendar or tasks room */
2192         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
2193            && (CC->room.QRdefaultview != VIEW_TASKS)
2194         ) {
2195                 return(0);              /* Not an iCalendar-centric room */
2196         }
2197
2198         /* It must be an RFC822 message! */
2199         if (msg->cm_format_type != 4) {
2200                 CtdlLogPrintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
2201                 return(1);              /* You tried to save a non-RFC822 message! */
2202         }
2203
2204         if (msg->cm_fields['M'] == NULL) {
2205                 return(1);              /* You tried to save a null message! */
2206         }
2207
2208         /* Do all of our lovely back-end parsing */
2209         mime_parser(msg->cm_fields['M'],
2210                 NULL,
2211                 *ical_obj_beforesave_backend,
2212                 NULL, NULL,
2213                 (void *)msg,
2214                 0
2215         );
2216
2217         return(0);
2218 }
2219
2220
2221 /*
2222  * Things we need to do after saving a calendar event.
2223  */
2224 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
2225                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2226                 char *encoding, char *cbid, void *cbuserdata)
2227 {
2228         icalcomponent *cal;
2229
2230         /* We're only interested in calendar items here. */
2231         if (  (strcasecmp(cbtype, "text/calendar"))
2232            && (strcasecmp(cbtype, "application/ics")) ) {
2233                 return;
2234         }
2235
2236         /* Hunt for the UID and drop it in
2237          * the "user data" pointer for the MIME parser.  When
2238          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2239          * to that string.
2240          */
2241         if (  (!strcasecmp(cbtype, "text/calendar"))
2242            || (!strcasecmp(cbtype, "application/ics")) ) {
2243                 cal = icalcomponent_new_from_string(content);
2244                 if (cal != NULL) {
2245                         ical_saving_vevent(cal, cal);
2246                         icalcomponent_free(cal);
2247                 }
2248         }
2249 }
2250
2251
2252 /*
2253  * Things we need to do after saving a calendar event.
2254  * (This will start back end tasks such as automatic generation of invitations,
2255  * if such actions are appropriate.)
2256  */
2257 int ical_obj_aftersave(struct CtdlMessage *msg)
2258 {
2259         char roomname[ROOMNAMELEN];
2260
2261         /*
2262          * If this isn't the Calendar> room, no further action is necessary.
2263          */
2264
2265         /* First determine if this is our room */
2266         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2267         if (strcasecmp(roomname, CC->room.QRname)) {
2268                 return(0);      /* Not the Calendar room -- don't do anything. */
2269         }
2270
2271         /* It must be an RFC822 message! */
2272         if (msg->cm_format_type != 4) return(1);
2273
2274         /* Reject null messages */
2275         if (msg->cm_fields['M'] == NULL) return(1);
2276
2277         /* Now recurse through it looking for our icalendar data */
2278         mime_parser(msg->cm_fields['M'],
2279                 NULL,
2280                 *ical_obj_aftersave_backend,
2281                 NULL, NULL,
2282                 NULL,
2283                 0
2284         );
2285
2286         return(0);
2287 }
2288
2289
2290 void ical_session_startup(void) {
2291         CIT_ICAL = malloc(sizeof(struct cit_ical));
2292         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2293 }
2294
2295 void ical_session_shutdown(void) {
2296         free(CIT_ICAL);
2297 }
2298
2299
2300 /*
2301  * Back end for ical_fixed_output()
2302  */
2303 void ical_fixed_output_backend(icalcomponent *cal,
2304                         int recursion_level
2305 ) {
2306         icalcomponent *c;
2307         icalproperty *p;
2308         char buf[256];
2309
2310         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2311         if (p != NULL) {
2312                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2313         }
2314
2315         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2316         if (p != NULL) {
2317                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2318         }
2319
2320         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2321         if (p != NULL) {
2322                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2323         }
2324
2325         /* If the component has attendees, iterate through them. */
2326         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2327                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2328                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2329
2330                         /* screen name or email address */
2331                         strcpy(buf, &buf[7]);
2332                         striplt(buf);
2333                         cprintf("%s ", buf);
2334                 }
2335                 cprintf("\n");
2336         }
2337
2338         /* If the component has subcomponents, recurse through them. */
2339         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2340             (c != 0);
2341             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2342                 /* Recursively process subcomponent */
2343                 ical_fixed_output_backend(c, recursion_level+1);
2344         }
2345 }
2346
2347
2348
2349 /*
2350  * Function to output iCalendar data as plain text.  Nobody uses MSG0
2351  * anymore, so really this is just so we expose the vCard data to the full
2352  * text indexer.
2353  */
2354 void ical_fixed_output(char *ptr, int len) {
2355         icalcomponent *cal;
2356         char *stringy_cal;
2357
2358         stringy_cal = malloc(len + 1);
2359         safestrncpy(stringy_cal, ptr, len + 1);
2360         cal = icalcomponent_new_from_string(stringy_cal);
2361         free(stringy_cal);
2362
2363         if (cal == NULL) {
2364                 return;
2365         }
2366
2367         ical_fixed_output_backend(cal, 0);
2368
2369         /* Free the memory we obtained from libical's constructor */
2370         icalcomponent_free(cal);
2371 }
2372
2373
2374
2375 void serv_calendar_destroy(void)
2376 {
2377         icaltimezone_free_builtin_timezones();
2378 }
2379
2380 /*
2381  * Register this module with the Citadel server.
2382  */
2383 CTDL_MODULE_INIT(calendar)
2384 {
2385         if (!threading)
2386         {
2387
2388                 /* Tell libical to return errors instead of aborting if it gets bad data */
2389                 icalerror_errors_are_fatal = 0;
2390
2391                 /* Use our own application prefix in tzid's generated from system tzdata */
2392                 icaltimezone_set_tzid_prefix("/citadel.org/");
2393
2394                 /* Initialize our hook functions */
2395                 CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2396                 CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2397                 CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2398                 CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2399                 CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2400                 CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2401                 CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2402                 CtdlRegisterFixedOutputHook("application/ics", ical_fixed_output);
2403                 CtdlRegisterCleanupHook(serv_calendar_destroy);
2404         }
2405
2406         /* return our Subversion id for the Log */
2407         return "$Id$";
2408 }