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  * Returns nonzero if a conflict was reported.  This allows the caller to stop iterating.
 863  */
 864 int ical_conflicts_phase6(struct icaltimetype t1start,
 865                         struct icaltimetype t1end,
 866                         struct icaltimetype t2start,
 867                         struct icaltimetype t2end,
 868                         long existing_msgnum,
 869                         char *conflict_event_uid,
 870                         char *conflict_event_summary,
 871                         char *compare_uid)
 872 {
 873         int conflict_reported = 0;
 874
 875         /* debugging cruft */
 876         time_t tt;
 877         tt = icaltime_as_timet(t1start);
 878         CtdlLogPrintf(CTDL_DEBUG, "PROPOSED START: %s", ctime(&tt));
 879         tt = icaltime_as_timet(t1end);
 880         CtdlLogPrintf(CTDL_DEBUG, "  PROPOSED END: %s", ctime(&tt));
 881         tt = icaltime_as_timet(t2start);
 882         CtdlLogPrintf(CTDL_DEBUG, "EXISTING START: %s", ctime(&tt));
 883         tt = icaltime_as_timet(t2end);
 884         CtdlLogPrintf(CTDL_DEBUG, "  EXISTING END: %s", ctime(&tt));
 885         /* debugging cruft */
 886
 887         /* compare and output */
 888
 889         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 890                 cprintf("%ld||%s|%s|%d|\n",
 891                         existing_msgnum,
 892                         conflict_event_uid,
 893                         conflict_event_summary,
 894                         (       ((strlen(compare_uid)>0)
 895                                 &&(!strcasecmp(compare_uid,
 896                                 conflict_event_uid))) ? 1 : 0
 897                         )
 898                 );
 899                 conflict_reported = 1;
 900         }
 901
 902         return(conflict_reported);
 903 }
 904
 905
 906
 907 /*
 908  * Phase 5 of "hunt for conflicts"
 909  * Called by ical_conflicts_phase4()
 910  *
 911  * We have the proposed event boiled down to start and end times.
 912  * Now check it against an existing event.
 913  */
 914 void ical_conflicts_phase5(struct icaltimetype t1start,
 915                         struct icaltimetype t1end,
 916                         icalcomponent *existing_event,
 917                         long existing_msgnum,
 918                         char *compare_uid)
 919 {
 920         char conflict_event_uid[SIZ];
 921         char conflict_event_summary[SIZ];
 922         struct icaltimetype t2start, t2end;
 923         icalproperty *p;
 924
 925         /* recur variables */
 926         icalproperty *rrule = NULL;
 927         struct icalrecurrencetype recur;
 928         icalrecur_iterator *ritr = NULL;
 929         struct icaldurationtype dur;
 930         int num_recur = 0;
 931
 932         /* initialization */
 933         strcpy(conflict_event_uid, "");
 934         strcpy(conflict_event_summary, "");
 935         t2start = icaltime_null_time();
 936         t2end = icaltime_null_time();
 937
 938         /* existing event stuff */
 939         p = ical_ctdl_get_subprop(existing_event, ICAL_DTSTART_PROPERTY);
 940         if (p == NULL) return;
 941         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 942
 943         p = ical_ctdl_get_subprop(existing_event, ICAL_DTEND_PROPERTY);
 944         if (p != NULL) {
 945                 t2end = icalproperty_get_dtend(p);
 946                 dur = icaltime_subtract(t2end, t2start);
 947         }
 948
 949         rrule = ical_ctdl_get_subprop(existing_event, ICAL_RRULE_PROPERTY);
 950         if (rrule) {
 951                 recur = icalproperty_get_rrule(rrule);
 952                 ritr = icalrecur_iterator_new(recur, t2start);
 953                 CtdlLogPrintf(CTDL_DEBUG, "Recurrence found: %s\n", icalrecurrencetype_as_string(&recur));
 954         }
 955
 956         do {
 957                 p = ical_ctdl_get_subprop(existing_event, ICAL_UID_PROPERTY);
 958                 if (p != NULL) {
 959                         strcpy(conflict_event_uid, icalproperty_get_comment(p));
 960                 }
 961
 962                 p = ical_ctdl_get_subprop(existing_event, ICAL_SUMMARY_PROPERTY);
 963                 if (p != NULL) {
 964                         strcpy(conflict_event_summary, icalproperty_get_comment(p));
 965                 }
 966
 967                 if (ical_conflicts_phase6(t1start, t1end, t2start, t2end,
 968                    existing_msgnum, conflict_event_uid, conflict_event_summary, compare_uid))
 969                 {
 970                         CtdlLogPrintf(CTDL_DEBUG, "Hit a conflict after %d iterations\n", num_recur);
 971                         num_recur = MAX_RECUR + 1;      /* force it out of scope */
 972                 }
 973
 974                 if (rrule) {
 975                         t2start = icalrecur_iterator_next(ritr);
 976                         if (!icaltime_is_null_time(t2end)) {
 977                                 t2end = icaltime_add(t2start, dur);
 978                         }
 979                         ++num_recur;
 980                 }
 981
 982                 if (icaltime_compare(t2start, t1end) < 0) {
 983                         CtdlLogPrintf(CTDL_DEBUG, "Went out of scope after %d iterations\n", num_recur);
 984                         num_recur = MAX_RECUR + 1;      /* force it out of scope */
 985                 }
 986
 987         } while ( (rrule) && (!icaltime_is_null_time(t2start)) && (num_recur < MAX_RECUR) );
 988         icalrecur_iterator_free(ritr);
 989         if (num_recur > 0) CtdlLogPrintf(CTDL_DEBUG, "Iterated over existing event %d times.\n", num_recur);
 990 }
 991
 992
 993
 994
 995 /*
 996  * Phase 4 of "hunt for conflicts"
 997  * Called by ical_hunt_for_conflicts_backend()
 998  *
 999  * At this point we've got it boiled down to two icalcomponent events in memory.
1000  * If they conflict, output something to the client.
1001  */
1002 void ical_conflicts_phase4(icalcomponent *proposed_event,
1003                 icalcomponent *existing_event,
1004                 long existing_msgnum)
1005 {
1006         struct icaltimetype t1start, t1end;
1007         t1start = icaltime_null_time();
1008         t1end = icaltime_null_time();
1009         icalproperty *p;
1010         char compare_uid[SIZ];
1011
1012         /* recur variables */
1013         icalproperty *rrule = NULL;
1014         struct icalrecurrencetype recur;
1015         icalrecur_iterator *ritr = NULL;
1016         struct icaldurationtype dur;
1017         int num_recur = 0;
1018
1019         /* initialization */
1020         strcpy(compare_uid, "");
1021
1022         /* proposed event stuff */
1023
1024         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTSTART_PROPERTY);
1025         if (p == NULL) return;
1026         if (p != NULL) t1start = icalproperty_get_dtstart(p);
1027
1028         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTEND_PROPERTY);
1029         if (p != NULL) {
1030                 t1end = icalproperty_get_dtend(p);
1031                 dur = icaltime_subtract(t1end, t1start);
1032         }
1033
1034         rrule = ical_ctdl_get_subprop(proposed_event, ICAL_RRULE_PROPERTY);
1035         if (rrule) {
1036                 recur = icalproperty_get_rrule(rrule);
1037                 ritr = icalrecur_iterator_new(recur, t1start);
1038                 CtdlLogPrintf(CTDL_DEBUG, "Recurrence found: %s\n", icalrecurrencetype_as_string(&recur));
1039         }
1040
1041         p = ical_ctdl_get_subprop(proposed_event, ICAL_UID_PROPERTY);
1042         if (p != NULL) {
1043                 strcpy(compare_uid, icalproperty_get_comment(p));
1044         }
1045
1046         do {
1047                 ical_conflicts_phase5(t1start, t1end, existing_event, existing_msgnum, compare_uid);
1048
1049                 if (rrule) {
1050                         t1start = icalrecur_iterator_next(ritr);
1051                         if (!icaltime_is_null_time(t1end)) {
1052                                 t1end = icaltime_add(t1start, dur);
1053                         }
1054                         ++num_recur;
1055                 }
1056
1057         } while ( (rrule) && (!icaltime_is_null_time(t1start)) && (num_recur < MAX_RECUR) );
1058         icalrecur_iterator_free(ritr);
1059         if (num_recur > 0) CtdlLogPrintf(CTDL_DEBUG, "Iterated over proposed event %d times.\n", num_recur);
1060 }
1061
1062
1063
1064 /*
1065  * Phase 3 of "hunt for conflicts"
1066  * Called by ical_hunt_for_conflicts()
1067  */
1068 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
1069         icalcomponent *proposed_event;
1070         struct CtdlMessage *msg = NULL;
1071         struct ical_respond_data ird;
1072
1073         proposed_event = (icalcomponent *)data;
1074
1075         msg = CtdlFetchMessage(msgnum, 1);
1076         if (msg == NULL) return;
1077         memset(&ird, 0, sizeof ird);
1078         strcpy(ird.desired_partnum, "_HUNT_");
1079         mime_parser(msg->cm_fields['M'],
1080                 NULL,
1081                 *ical_locate_part,              /* callback function */
1082                 NULL, NULL,
1083                 (void *) &ird,                  /* user data */
1084                 0
1085         );
1086         CtdlFreeMessage(msg);
1087
1088         if (ird.cal == NULL) return;
1089
1090         ical_conflicts_phase4(proposed_event, ird.cal, msgnum);
1091         icalcomponent_free(ird.cal);
1092 }
1093
1094
1095
1096 /*
1097  * Phase 2 of "hunt for conflicts" operation.
1098  * At this point we have a calendar object which represents the VEVENT that
1099  * is proposed for addition to the calendar.  Now hunt through the user's
1100  * calendar room, and output zero or more existing VEVENTs which conflict
1101  * with this one.
1102  */
1103 void ical_hunt_for_conflicts(icalcomponent *cal) {
1104         char hold_rm[ROOMNAMELEN];
1105
1106         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1107
1108         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
1109                 getroom(&CC->room, hold_rm);
1110                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
1111                 return;
1112         }
1113
1114         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
1115
1116         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1117                 NULL,
1118                 NULL,
1119                 ical_hunt_for_conflicts_backend,
1120                 (void *) cal
1121         );
1122
1123         cprintf("000\n");
1124         getroom(&CC->room, hold_rm);    /* return to saved room */
1125
1126 }
1127
1128
1129
1130 /*
1131  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1132  */
1133 void ical_conflicts(long msgnum, char *partnum) {
1134         struct CtdlMessage *msg = NULL;
1135         struct ical_respond_data ird;
1136
1137         msg = CtdlFetchMessage(msgnum, 1);
1138         if (msg == NULL) {
1139                 cprintf("%d Message %ld not found\n",
1140                         ERROR + ILLEGAL_VALUE,
1141                         (long)msgnum
1142                 );
1143                 return;
1144         }
1145
1146         memset(&ird, 0, sizeof ird);
1147         strcpy(ird.desired_partnum, partnum);
1148         mime_parser(msg->cm_fields['M'],
1149                 NULL,
1150                 *ical_locate_part,              /* callback function */
1151                 NULL, NULL,
1152                 (void *) &ird,                  /* user data */
1153                 0
1154         );
1155
1156         CtdlFreeMessage(msg);
1157
1158         if (ird.cal != NULL) {
1159                 ical_hunt_for_conflicts(ird.cal);
1160                 icalcomponent_free(ird.cal);
1161                 return;
1162         }
1163
1164         cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1165 }
1166
1167
1168
1169 /*
1170  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1171  */
1172 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1173         icalproperty *p;
1174         icalvalue *v;
1175         struct icalperiodtype my_period;
1176
1177         if (cal == NULL) return;
1178         my_period = icalperiodtype_null_period();
1179
1180         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1181                 ical_add_to_freebusy(fb,
1182                         icalcomponent_get_first_component(
1183                                 cal, ICAL_VEVENT_COMPONENT
1184                         )
1185                 );
1186                 return;
1187         }
1188
1189         /* If this event is not opaque, the user isn't publishing it as
1190          * busy time, so don't bother doing anything else.
1191          */
1192         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1193         if (p != NULL) {
1194                 v = icalproperty_get_value(p);
1195                 if (v != NULL) {
1196                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1197                                 return;
1198                         }
1199                 }
1200         }
1201
1202         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1203         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1204         if (p != NULL) {
1205                 my_period.start = icalproperty_get_dtstart(p);
1206         }
1207
1208         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1209         if (p != NULL) {
1210                 my_period.end = icalproperty_get_dtstart(p);
1211         }
1212
1213         /* Now add it. */
1214         icalcomponent_add_property(fb,
1215                 icalproperty_new_freebusy(my_period)
1216         );
1217
1218         /* Make sure the DTSTART property of the freebusy *list* is set to
1219          * the DTSTART property of the *earliest event*.
1220          */
1221         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1222         if (p == NULL) {
1223                 icalcomponent_set_dtstart(fb,
1224                         icalcomponent_get_dtstart(cal) );
1225         }
1226         else {
1227                 if (icaltime_compare(
1228                         icalcomponent_get_dtstart(cal),
1229                         icalcomponent_get_dtstart(fb)
1230                    ) < 0) {
1231                         icalcomponent_set_dtstart(fb,
1232                                 icalcomponent_get_dtstart(cal) );
1233                 }
1234         }
1235
1236         /* Make sure the DTEND property of the freebusy *list* is set to
1237          * the DTEND property of the *latest event*.
1238          */
1239         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1240         if (p == NULL) {
1241                 icalcomponent_set_dtend(fb,
1242                         icalcomponent_get_dtend(cal) );
1243         }
1244         else {
1245                 if (icaltime_compare(
1246                         icalcomponent_get_dtend(cal),
1247                         icalcomponent_get_dtend(fb)
1248                    ) > 0) {
1249                         icalcomponent_set_dtend(fb,
1250                                 icalcomponent_get_dtend(cal) );
1251                 }
1252         }
1253
1254 }
1255
1256
1257
1258 /*
1259  * Backend for ical_freebusy()
1260  *
1261  * This function simply loads the messages in the user's calendar room,
1262  * which contain VEVENTs, then strips them of all non-freebusy data, and
1263  * adds them to the supplied VCALENDAR.
1264  *
1265  */
1266 void ical_freebusy_backend(long msgnum, void *data) {
1267         icalcomponent *cal;
1268         struct CtdlMessage *msg = NULL;
1269         struct ical_respond_data ird;
1270
1271         cal = (icalcomponent *)data;
1272
1273         msg = CtdlFetchMessage(msgnum, 1);
1274         if (msg == NULL) return;
1275         memset(&ird, 0, sizeof ird);
1276         strcpy(ird.desired_partnum, "_HUNT_");
1277         mime_parser(msg->cm_fields['M'],
1278                 NULL,
1279                 *ical_locate_part,              /* callback function */
1280                 NULL, NULL,
1281                 (void *) &ird,                  /* user data */
1282                 0
1283         );
1284         CtdlFreeMessage(msg);
1285
1286         if (ird.cal == NULL) return;
1287
1288         ical_add_to_freebusy(cal, ird.cal);
1289
1290         /* Now free the memory. */
1291         icalcomponent_free(ird.cal);
1292 }
1293
1294
1295
1296 /*
1297  * Grab another user's free/busy times
1298  */
1299 void ical_freebusy(char *who) {
1300         struct ctdluser usbuf;
1301         char calendar_room_name[ROOMNAMELEN];
1302         char hold_rm[ROOMNAMELEN];
1303         char *serialized_request = NULL;
1304         icalcomponent *encaps = NULL;
1305         icalcomponent *fb = NULL;
1306         int found_user = (-1);
1307         struct recptypes *recp = NULL;
1308         char buf[256];
1309         char host[256];
1310         char type[256];
1311         int i = 0;
1312         int config_lines = 0;
1313
1314         /* First try an exact match. */
1315         found_user = getuser(&usbuf, who);
1316
1317         /* If not found, try it as an unqualified email address. */
1318         if (found_user != 0) {
1319                 strcpy(buf, who);
1320                 recp = validate_recipients(buf, NULL, 0);
1321                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1322                 if (recp != NULL) {
1323                         if (recp->num_local == 1) {
1324                                 found_user = getuser(&usbuf, recp->recp_local);
1325                         }
1326                         free_recipients(recp);
1327                 }
1328         }
1329
1330         /* If still not found, try it as an address qualified with the
1331          * primary FQDN of this Citadel node.
1332          */
1333         if (found_user != 0) {
1334                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1335                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1336                 recp = validate_recipients(buf, NULL, 0);
1337                 if (recp != NULL) {
1338                         if (recp->num_local == 1) {
1339                                 found_user = getuser(&usbuf, recp->recp_local);
1340                         }
1341                         free_recipients(recp);
1342                 }
1343         }
1344
1345         /* Still not found?  Try qualifying it with every domain we
1346          * might have addresses in.
1347          */
1348         if (found_user != 0) {
1349                 config_lines = num_tokens(inetcfg, '\n');
1350                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1351                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1352                         extract_token(host, buf, 0, '|', sizeof host);
1353                         extract_token(type, buf, 1, '|', sizeof type);
1354
1355                         if ( (!strcasecmp(type, "localhost"))
1356                            || (!strcasecmp(type, "directory")) ) {
1357                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1358                                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1359                                 recp = validate_recipients(buf, NULL, 0);
1360                                 if (recp != NULL) {
1361                                         if (recp->num_local == 1) {
1362                                                 found_user = getuser(&usbuf, recp->recp_local);
1363                                         }
1364                                         free_recipients(recp);
1365                                 }
1366                         }
1367                 }
1368         }
1369
1370         if (found_user != 0) {
1371                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1372                 return;
1373         }
1374
1375         MailboxName(calendar_room_name, sizeof calendar_room_name,
1376                 &usbuf, USERCALENDARROOM);
1377
1378         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1379
1380         if (getroom(&CC->room, calendar_room_name) != 0) {
1381                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1382                 getroom(&CC->room, hold_rm);
1383                 return;
1384         }
1385
1386         /* Create a VFREEBUSY subcomponent */
1387         CtdlLogPrintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1388         fb = icalcomponent_new_vfreebusy();
1389         if (fb == NULL) {
1390                 cprintf("%d Internal error: cannot allocate memory.\n",
1391                         ERROR + INTERNAL_ERROR);
1392                 getroom(&CC->room, hold_rm);
1393                 return;
1394         }
1395
1396         /* Set the method to PUBLISH */
1397         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1398
1399         /* Set the DTSTAMP to right now. */
1400         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1401
1402         /* Add the user's email address as ORGANIZER */
1403         sprintf(buf, "MAILTO:%s", who);
1404         if (strchr(buf, '@') == NULL) {
1405                 strcat(buf, "@");
1406                 strcat(buf, config.c_fqdn);
1407         }
1408         for (i=0; buf[i]; ++i) {
1409                 if (buf[i]==' ') buf[i] = '_';
1410         }
1411         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1412
1413         /* Add busy time from events */
1414         CtdlLogPrintf(CTDL_DEBUG, "Adding busy time from events\n");
1415         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1416
1417         /* If values for DTSTART and DTEND are still not present, set them
1418          * to yesterday and tomorrow as default values.
1419          */
1420         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1421                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1422         }
1423         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1424                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1425         }
1426
1427         /* Put the freebusy component into the calendar component */
1428         CtdlLogPrintf(CTDL_DEBUG, "Encapsulating\n");
1429         encaps = ical_encapsulate_subcomponent(fb);
1430         if (encaps == NULL) {
1431                 icalcomponent_free(fb);
1432                 cprintf("%d Internal error: cannot allocate memory.\n",
1433                         ERROR + INTERNAL_ERROR);
1434                 getroom(&CC->room, hold_rm);
1435                 return;
1436         }
1437
1438         /* Set the method to PUBLISH */
1439         CtdlLogPrintf(CTDL_DEBUG, "Setting method\n");
1440         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1441
1442         /* Serialize it */
1443         CtdlLogPrintf(CTDL_DEBUG, "Serializing\n");
1444         serialized_request = icalcomponent_as_ical_string_r(encaps);
1445         icalcomponent_free(encaps);     /* Don't need this anymore. */
1446
1447         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1448         if (serialized_request != NULL) {
1449                 client_write(serialized_request, strlen(serialized_request));
1450                 free(serialized_request);
1451         }
1452         cprintf("\n000\n");
1453
1454         /* Go back to the room from which we came... */
1455         getroom(&CC->room, hold_rm);
1456 }
1457
1458
1459
1460 /*
1461  * Backend for ical_getics()
1462  *
1463  * This is a ForEachMessage() callback function that searches the current room
1464  * for calendar events and adds them each into one big calendar component.
1465  */
1466 void ical_getics_backend(long msgnum, void *data) {
1467         icalcomponent *encaps, *c;
1468         struct CtdlMessage *msg = NULL;
1469         struct ical_respond_data ird;
1470
1471         encaps = (icalcomponent *)data;
1472         if (encaps == NULL) return;
1473
1474         /* Look for the calendar event... */
1475
1476         msg = CtdlFetchMessage(msgnum, 1);
1477         if (msg == NULL) return;
1478         memset(&ird, 0, sizeof ird);
1479         strcpy(ird.desired_partnum, "_HUNT_");
1480         mime_parser(msg->cm_fields['M'],
1481                 NULL,
1482                 *ical_locate_part,              /* callback function */
1483                 NULL, NULL,
1484                 (void *) &ird,                  /* user data */
1485                 0
1486         );
1487         CtdlFreeMessage(msg);
1488
1489         if (ird.cal == NULL) return;
1490
1491         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1492          * are responsible for "the_request"'s memory -- it will be freed
1493          * when we free "encaps".
1494          */
1495
1496         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1497          * in.  This will almost never happen.
1498          */
1499         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1500                 icalcomponent_add_component(encaps, ird.cal);
1501         }
1502         /*
1503          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1504          * and other components encapsulated inside, we have to extract them.
1505          */
1506         else {
1507                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1508                     (c != NULL);
1509                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1510
1511                         /* For VTIMEZONE components, suppress duplicates of the same tzid */
1512
1513                         if (icalcomponent_isa(c) == ICAL_VTIMEZONE_COMPONENT) {
1514                                 icalproperty *p = icalcomponent_get_first_property(c, ICAL_TZID_PROPERTY);
1515                                 if (p) {
1516                                         const char *tzid = icalproperty_get_tzid(p);
1517                                         if (!icalcomponent_get_timezone(encaps, tzid)) {
1518                                                 icalcomponent_add_component(encaps,
1519                                                                         icalcomponent_new_clone(c));
1520                                         }
1521                                 }
1522                         }
1523
1524                         /* All other types of components can go in verbatim */
1525                         else {
1526                                 icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1527                         }
1528                 }
1529                 icalcomponent_free(ird.cal);
1530         }
1531 }
1532
1533
1534
1535 /*
1536  * Retrieve all of the calendar items in the current room, and output them
1537  * as a single icalendar object.
1538  */
1539 void ical_getics(void)
1540 {
1541         icalcomponent *encaps = NULL;
1542         char *ser = NULL;
1543
1544         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1545            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1546                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1547                 return;         /* Not an iCalendar-centric room */
1548         }
1549
1550         encaps = icalcomponent_new_vcalendar();
1551         if (encaps == NULL) {
1552                 CtdlLogPrintf(CTDL_DEBUG, "ERROR: could not allocate component!\n");
1553                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1554                 return;
1555         }
1556
1557         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1558
1559         /* Set the Product ID */
1560         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1561
1562         /* Set the Version Number */
1563         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1564
1565         /* Set the method to PUBLISH */
1566         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1567
1568         /* Now go through the room encapsulating all calendar items. */
1569         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1570                 NULL,
1571                 NULL,
1572                 ical_getics_backend,
1573                 (void *) encaps
1574         );
1575
1576         ser = icalcomponent_as_ical_string_r(encaps);
1577         icalcomponent_free(encaps);                     /* Don't need this anymore. */
1578         client_write(ser, strlen(ser));
1579         free(ser);
1580         cprintf("\n000\n");
1581 }
1582
1583
1584 /*
1585  * Helper callback function for ical_putics() to discover which TZID's we need.
1586  * Simply put the tzid name string into a hash table.  After the callbacks are
1587  * done we'll go through them and attach the ones that we have.
1588  */
1589 void ical_putics_grabtzids(icalparameter *param, void *data)
1590 {
1591         const char *tzid = icalparameter_get_tzid(param);
1592         HashList *keys = (HashList *) data;
1593
1594         if ( (keys) && (tzid) && (!IsEmptyStr(tzid)) ) {
1595                 Put(keys, tzid, strlen(tzid), strdup(tzid), generic_free_handler);
1596         }
1597 }
1598
1599
1600 /*
1601  * Delete all of the calendar items in the current room, and replace them
1602  * with calendar items from a client-supplied data stream.
1603  */
1604 void ical_putics(void)
1605 {
1606         char *calstream = NULL;
1607         icalcomponent *cal;
1608         icalcomponent *c;
1609         icalcomponent *encaps = NULL;
1610         HashList *tzidlist = NULL;
1611         HashPos *HashPos;
1612         void *Value;
1613         const char *Key;
1614         long len;
1615
1616         /* Only allow this operation if we're in a room containing a calendar or tasks view */
1617         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1618            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1619                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1620                 return;
1621         }
1622
1623         /* Only allow this operation if we have permission to overwrite the existing calendar */
1624         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1625                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1626                 return;
1627         }
1628
1629         cprintf("%d Transmit data now\n", SEND_LISTING);
1630         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0, 0);
1631         if (calstream == NULL) {
1632                 return;
1633         }
1634
1635         cal = icalcomponent_new_from_string(calstream);
1636         free(calstream);
1637
1638         /* We got our data stream -- now do something with it. */
1639
1640         /* Delete the existing messages in the room, because we are overwriting
1641          * the entire calendar with an entire new (or updated) calendar.
1642          * (Careful: this opens an S_ROOMS critical section!)
1643          */
1644         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1645
1646         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1647          * in.  This will almost never happen.
1648          */
1649         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1650                 ical_write_to_cal(NULL, cal);
1651         }
1652         /*
1653          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1654          * and other components encapsulated inside, we have to extract them.
1655          */
1656         else {
1657                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1658                     (c != NULL);
1659                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1660
1661                         /* Non-VTIMEZONE components each get written as individual messages.
1662                          * But we also need to attach the relevant VTIMEZONE components to them.
1663                          */
1664                         if ( (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT)
1665                            && (encaps = icalcomponent_new_vcalendar()) ) {
1666                                 icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1667                                 icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1668                                 icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1669
1670                                 /* Attach any needed timezones here */
1671                                 tzidlist = NewHash(1, NULL);
1672                                 if (tzidlist) {
1673                                         icalcomponent_foreach_tzid(c, ical_putics_grabtzids, tzidlist);
1674                                 }
1675                                 HashPos = GetNewHashPos(tzidlist, 0);
1676
1677                                 while (GetNextHashPos(tzidlist, HashPos, &len, &Key, &Value)) {
1678                                         CtdlLogPrintf(CTDL_DEBUG, "Attaching timezone '%s'\n", Value);
1679                                         icaltimezone *t = NULL;
1680
1681                                         /* First look for a timezone attached to the original calendar */
1682                                         t = icalcomponent_get_timezone(cal, Value);
1683
1684                                         /* Try built-in tzdata if the right one wasn't attached */
1685                                         if (!t) {
1686                                                 t = icaltimezone_get_builtin_timezone(Value);
1687                                         }
1688
1689                                         /* I've got a valid timezone to attach. */
1690                                         if (t) {
1691                                                 icalcomponent_add_component(encaps,
1692                                                         icalcomponent_new_clone(
1693                                                                 icaltimezone_get_component(t)
1694                                                         )
1695                                                 );
1696                                         }
1697
1698                                 }
1699                                 DeleteHashPos(&HashPos);
1700                                 DeleteHash(&tzidlist);
1701
1702                                 /* Now attach the component itself (usually a VEVENT or VTODO) */
1703                                 icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1704
1705                                 /* Write it to the message store */
1706                                 ical_write_to_cal(NULL, encaps);
1707                                 icalcomponent_free(encaps);
1708                         }
1709                 }
1710         }
1711
1712         icalcomponent_free(cal);
1713 }
1714
1715
1716 /*
1717  * All Citadel calendar commands from the client come through here.
1718  */
1719 void cmd_ical(char *argbuf)
1720 {
1721         char subcmd[64];
1722         long msgnum;
1723         char partnum[256];
1724         char action[256];
1725         char who[256];
1726
1727         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1728
1729         /* Allow "test" and "freebusy" subcommands without logging in. */
1730
1731         if (!strcasecmp(subcmd, "test")) {
1732                 cprintf("%d This server supports calendaring\n", CIT_OK);
1733                 return;
1734         }
1735
1736         if (!strcasecmp(subcmd, "freebusy")) {
1737                 extract_token(who, argbuf, 1, '|', sizeof who);
1738                 ical_freebusy(who);
1739                 return;
1740         }
1741
1742         if (!strcasecmp(subcmd, "sgi")) {
1743                 CIT_ICAL->server_generated_invitations =
1744                         (extract_int(argbuf, 1) ? 1 : 0) ;
1745                 cprintf("%d %d\n",
1746                         CIT_OK, CIT_ICAL->server_generated_invitations);
1747                 return;
1748         }
1749
1750         if (CtdlAccessCheck(ac_logged_in)) return;
1751
1752         if (!strcasecmp(subcmd, "respond")) {
1753                 msgnum = extract_long(argbuf, 1);
1754                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1755                 extract_token(action, argbuf, 3, '|', sizeof action);
1756                 ical_respond(msgnum, partnum, action);
1757                 return;
1758         }
1759
1760         if (!strcasecmp(subcmd, "handle_rsvp")) {
1761                 msgnum = extract_long(argbuf, 1);
1762                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1763                 extract_token(action, argbuf, 3, '|', sizeof action);
1764                 ical_handle_rsvp(msgnum, partnum, action);
1765                 return;
1766         }
1767
1768         if (!strcasecmp(subcmd, "conflicts")) {
1769                 msgnum = extract_long(argbuf, 1);
1770                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1771                 ical_conflicts(msgnum, partnum);
1772                 return;
1773         }
1774
1775         if (!strcasecmp(subcmd, "getics")) {
1776                 ical_getics();
1777                 return;
1778         }
1779
1780         if (!strcasecmp(subcmd, "putics")) {
1781                 ical_putics();
1782                 return;
1783         }
1784
1785         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1786 }
1787
1788
1789
1790 /*
1791  * We don't know if the calendar room exists so we just create it at login
1792  */
1793 void ical_create_room(void)
1794 {
1795         struct ctdlroom qr;
1796         struct visit vbuf;
1797
1798         /* Create the calendar room if it doesn't already exist */
1799         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1800
1801         /* Set expiration policy to manual; otherwise objects will be lost! */
1802         if (lgetroom(&qr, USERCALENDARROOM)) {
1803                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1804                 return;
1805         }
1806         qr.QRep.expire_mode = EXPIRE_MANUAL;
1807         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1808         lputroom(&qr);
1809
1810         /* Set the view to a calendar view */
1811         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1812         vbuf.v_view = VIEW_CALENDAR;
1813         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1814
1815         /* Create the tasks list room if it doesn't already exist */
1816         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1817
1818         /* Set expiration policy to manual; otherwise objects will be lost! */
1819         if (lgetroom(&qr, USERTASKSROOM)) {
1820                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1821                 return;
1822         }
1823         qr.QRep.expire_mode = EXPIRE_MANUAL;
1824         qr.QRdefaultview = VIEW_TASKS;
1825         lputroom(&qr);
1826
1827         /* Set the view to a task list view */
1828         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1829         vbuf.v_view = VIEW_TASKS;
1830         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1831
1832         /* Create the notes room if it doesn't already exist */
1833         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1834
1835         /* Set expiration policy to manual; otherwise objects will be lost! */
1836         if (lgetroom(&qr, USERNOTESROOM)) {
1837                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1838                 return;
1839         }
1840         qr.QRep.expire_mode = EXPIRE_MANUAL;
1841         qr.QRdefaultview = VIEW_NOTES;
1842         lputroom(&qr);
1843
1844         /* Set the view to a notes view */
1845         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1846         vbuf.v_view = VIEW_NOTES;
1847         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1848
1849         return;
1850 }
1851
1852
1853 /*
1854  * ical_send_out_invitations() is called by ical_saving_vevent() when it finds a VEVENT.
1855  *
1856  * top_level_cal is the highest available level calendar object.
1857  * cal is the subcomponent containing the VEVENT.
1858  *
1859  * Note: if you change the encapsulation code here, change it in WebCit's ical_encapsulate_subcomponent()
1860  */
1861 void ical_send_out_invitations(icalcomponent *top_level_cal, icalcomponent *cal) {
1862         icalcomponent *the_request = NULL;
1863         char *serialized_request = NULL;
1864         icalcomponent *encaps = NULL;
1865         char *request_message_text = NULL;
1866         struct CtdlMessage *msg = NULL;
1867         struct recptypes *valid = NULL;
1868         char attendees_string[SIZ];
1869         int num_attendees = 0;
1870         char this_attendee[256];
1871         icalproperty *attendee = NULL;
1872         char summary_string[SIZ];
1873         icalproperty *summary = NULL;
1874         size_t reqsize;
1875         icalproperty *p;
1876         struct icaltimetype t;
1877         icaltimezone *attached_zones[5] = { NULL, NULL, NULL, NULL, NULL };
1878         int i;
1879         icaltimezone *z;
1880         int num_zones_attached = 0;
1881         int zone_already_attached;
1882
1883         if (cal == NULL) {
1884                 CtdlLogPrintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1885                 return;
1886         }
1887
1888
1889         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1890         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1891                 ical_send_out_invitations(top_level_cal,
1892                         icalcomponent_get_first_component(
1893                                 cal, ICAL_VEVENT_COMPONENT
1894                         )
1895                 );
1896                 return;
1897         }
1898
1899         /* Clone the event */
1900         the_request = icalcomponent_new_clone(cal);
1901         if (the_request == NULL) {
1902                 CtdlLogPrintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1903                 return;
1904         }
1905
1906         /* Extract the summary string -- we'll use it as the
1907          * message subject for the request
1908          */
1909         strcpy(summary_string, "Meeting request");
1910         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1911         if (summary != NULL) {
1912                 if (icalproperty_get_summary(summary)) {
1913                         strcpy(summary_string,
1914                                 icalproperty_get_summary(summary) );
1915                 }
1916         }
1917
1918         /* Determine who the recipients of this message are (the attendees) */
1919         strcpy(attendees_string, "");
1920         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1921                 if (icalproperty_get_attendee(attendee)) {
1922                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1923                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1924                                 strcpy(this_attendee, &this_attendee[7]);
1925
1926                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1927                                         snprintf(&attendees_string[strlen(attendees_string)],
1928                                                 sizeof(attendees_string) - strlen(attendees_string),
1929                                                 "%s, ",
1930                                                 this_attendee
1931                                         );
1932                                         ++num_attendees;
1933                                 }
1934                         }
1935                 }
1936         }
1937
1938         CtdlLogPrintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1939
1940         /* If there are no attendees, there are no invitations to send, so...
1941          * don't bother putting one together!  Punch out, Maverick!
1942          */
1943         if (num_attendees == 0) {
1944                 icalcomponent_free(the_request);
1945                 return;
1946         }
1947
1948         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1949         encaps = icalcomponent_new_vcalendar();
1950         if (encaps == NULL) {
1951                 CtdlLogPrintf(CTDL_DEBUG, "ERROR: could not allocate component!\n");
1952                 icalcomponent_free(the_request);
1953                 return;
1954         }
1955
1956         /* Set the Product ID */
1957         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1958
1959         /* Set the Version Number */
1960         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1961
1962         /* Set the method to REQUEST */
1963         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1964
1965         /* Look for properties containing timezone parameters, to see if we need to attach VTIMEZONEs */
1966         for (p = icalcomponent_get_first_property(the_request, ICAL_ANY_PROPERTY);
1967              p != NULL;
1968              p = icalcomponent_get_next_property(the_request, ICAL_ANY_PROPERTY))
1969         {
1970                 if ( (icalproperty_isa(p) == ICAL_COMPLETED_PROPERTY)
1971                   || (icalproperty_isa(p) == ICAL_CREATED_PROPERTY)
1972                   || (icalproperty_isa(p) == ICAL_DATEMAX_PROPERTY)
1973                   || (icalproperty_isa(p) == ICAL_DATEMIN_PROPERTY)
1974                   || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
1975                   || (icalproperty_isa(p) == ICAL_DTSTAMP_PROPERTY)
1976                   || (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
1977                   || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
1978                   || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
1979                   || (icalproperty_isa(p) == ICAL_LASTMODIFIED_PROPERTY)
1980                   || (icalproperty_isa(p) == ICAL_MAXDATE_PROPERTY)
1981                   || (icalproperty_isa(p) == ICAL_MINDATE_PROPERTY)
1982                   || (icalproperty_isa(p) == ICAL_RECURRENCEID_PROPERTY)
1983                 ) {
1984                         t = icalproperty_get_dtstart(p);        // it's safe to use dtstart for all of them
1985                         CtdlLogPrintf(CTDL_DEBUG, "Found an icaltimetype: %s\n",
1986                                 icaltime_as_ical_string(t)
1987                         );
1988
1989                         /* First see if there's a timezone attached to the data structure itself */
1990                         if (icaltime_is_utc(t)) {
1991                                 z = icaltimezone_get_utc_timezone();
1992                         }
1993                         else {
1994                                 z = icaltime_get_timezone(t);
1995                         }
1996                         if (z) CtdlLogPrintf(CTDL_DEBUG, "Timezone is present in data structure\n");
1997
1998                         /* If not, try to determine the tzid from the parameter using attached zones */
1999                         if (!z) {
2000                                 z = icalcomponent_get_timezone(top_level_cal,
2001                                         icalparameter_get_tzid(
2002                                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
2003                                         )
2004                                 );
2005                                 if (z) CtdlLogPrintf(CTDL_DEBUG, "Timezone was found in attached zones\n");
2006                         }
2007
2008                         /* Still no good?  Try our internal database */
2009                         if (!z) {
2010                                 z = icaltimezone_get_builtin_timezone_from_tzid(
2011                                         icalparameter_get_tzid(
2012                                                 icalproperty_get_first_parameter(p, ICAL_TZID_PARAMETER)
2013                                         )
2014                                 );
2015                                 if (z) CtdlLogPrintf(CTDL_DEBUG, "Timezone was found in internal db\n");
2016                         }
2017
2018                         if (z) {
2019                                 CtdlLogPrintf(CTDL_DEBUG, "Have valid timezone, need to attach it.\n");
2020
2021                                 zone_already_attached = 0;
2022                                 for (i=0; i<5; ++i) {
2023                                         if (z == attached_zones[i]) {
2024                                                 ++zone_already_attached;
2025                                                 CtdlLogPrintf(CTDL_DEBUG, "zone already attached!!\n");
2026                                         }
2027                                 }
2028                                 if ((!zone_already_attached) && (num_zones_attached < 5)) {
2029                                         CtdlLogPrintf(CTDL_DEBUG, "attach zone %d\n", num_zones_attached);
2030                                         attached_zones[num_zones_attached++] = z;
2031                                 }
2032
2033                                 icalproperty_set_parameter(p,
2034                                         icalparameter_new_tzid(icaltimezone_get_tzid(z))
2035                                 );
2036                         }
2037                 }
2038         }
2039
2040         /* Encapsulate any timezones we need */
2041         if (num_zones_attached > 0) for (i=0; i<num_zones_attached; ++i) {
2042                 icalcomponent *zc;
2043                 zc = icalcomponent_new_clone(icaltimezone_get_component(attached_zones[i]));
2044                 icalcomponent_add_component(encaps, zc);
2045         }
2046
2047         /* Here we go: encapsulate the VEVENT into the VCALENDAR.  We now no longer
2048          * are responsible for "the_request"'s memory -- it will be freed
2049          * when we free "encaps".
2050          */
2051         icalcomponent_add_component(encaps, the_request);
2052
2053         /* Serialize it */
2054         serialized_request = icalcomponent_as_ical_string_r(encaps);
2055         icalcomponent_free(encaps);     /* Don't need this anymore. */
2056         if (serialized_request == NULL) return;
2057
2058         CtdlLogPrintf(CTDL_DEBUG, "SENDING INVITATIONS:\n%s\n", serialized_request);
2059
2060         reqsize = strlen(serialized_request) + SIZ;
2061         request_message_text = malloc(reqsize);
2062         if (request_message_text != NULL) {
2063                 snprintf(request_message_text, reqsize,
2064                         "Content-type: text/calendar\r\n\r\n%s\r\n",
2065                         serialized_request
2066                 );
2067
2068                 msg = CtdlMakeMessage(&CC->user,
2069                         "",                     /* No single recipient here */
2070                         "",                     /* No single recipient here */
2071                         CC->room.QRname, 0, FMT_RFC822,
2072                         "",
2073                         "",
2074                         summary_string,         /* Use summary for subject */
2075                         NULL,
2076                         request_message_text,
2077                         NULL);
2078
2079                 if (msg != NULL) {
2080                         valid = validate_recipients(attendees_string, NULL, 0);
2081                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
2082                         CtdlFreeMessage(msg);
2083                         free_recipients(valid);
2084                 }
2085         }
2086         free(serialized_request);
2087 }
2088
2089
2090 /*
2091  * When a calendar object is being saved, determine whether it's a VEVENT
2092  * and the user saving it is the organizer.  If so, send out invitations
2093  * to any listed attendees.
2094  *
2095  * This function is recursive.  The caller can simply supply the same object
2096  * as both arguments.  When it recurses it will alter the second argument
2097  * while holding on to the top level object.  This allows us to go back and
2098  * grab things like time zones which might be attached.
2099  *
2100  */
2101 void ical_saving_vevent(icalcomponent *top_level_cal, icalcomponent *cal) {
2102         icalcomponent *c;
2103         icalproperty *organizer = NULL;
2104         char organizer_string[SIZ];
2105
2106         CtdlLogPrintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
2107
2108         /* Don't send out invitations unless the client wants us to. */
2109         if (CIT_ICAL->server_generated_invitations == 0) {
2110                 return;
2111         }
2112
2113         /* Don't send out invitations if we've been asked not to. */
2114         if (CIT_ICAL->avoid_sending_invitations > 0) {
2115                 return;
2116         }
2117
2118         strcpy(organizer_string, "");
2119         /*
2120          * The VEVENT subcomponent is the one we're interested in.
2121          * Send out invitations if, and only if, this user is the Organizer.
2122          */
2123         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
2124                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
2125                 if (organizer != NULL) {
2126                         if (icalproperty_get_organizer(organizer)) {
2127                                 strcpy(organizer_string,
2128                                         icalproperty_get_organizer(organizer));
2129                         }
2130                 }
2131                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
2132                         strcpy(organizer_string, &organizer_string[7]);
2133                         striplt(organizer_string);
2134                         /*
2135                          * If the user saving the event is listed as the
2136                          * organizer, then send out invitations.
2137                          */
2138                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
2139                                 ical_send_out_invitations(top_level_cal, cal);
2140                         }
2141                 }
2142         }
2143
2144         /* If the component has subcomponents, recurse through them. */
2145         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2146             (c != NULL);
2147             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2148                 /* Recursively process subcomponent */
2149                 ical_saving_vevent(top_level_cal, c);
2150         }
2151
2152 }
2153
2154
2155
2156 /*
2157  * Back end for ical_obj_beforesave()
2158  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
2159  * the summary of the event (becomes message subject),
2160  * and the start time (becomes message date/time).
2161  */
2162 void ical_obj_beforesave_backend(char *name, char *filename, char *partnum,
2163                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2164                 char *encoding, char *cbid, void *cbuserdata)
2165 {
2166         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
2167         icalproperty *p;
2168         char new_uid[256] = "";
2169         char buf[1024] = "";
2170         struct CtdlMessage *msg = (struct CtdlMessage *) cbuserdata;
2171
2172         if (!msg) return;
2173
2174         /* We're only interested in calendar data. */
2175         if (  (strcasecmp(cbtype, "text/calendar"))
2176            && (strcasecmp(cbtype, "application/ics")) ) {
2177                 return;
2178         }
2179
2180         /* Hunt for the UID and drop it in
2181          * the "user data" pointer for the MIME parser.  When
2182          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2183          * to that string.
2184          */
2185         whole_cal = icalcomponent_new_from_string(content);
2186         cal = whole_cal;
2187         if (cal != NULL) {
2188                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
2189                         nested_event = icalcomponent_get_first_component(
2190                                 cal, ICAL_VEVENT_COMPONENT);
2191                         if (nested_event != NULL) {
2192                                 cal = nested_event;
2193                         }
2194                         else {
2195                                 nested_todo = icalcomponent_get_first_component(
2196                                         cal, ICAL_VTODO_COMPONENT);
2197                                 if (nested_todo != NULL) {
2198                                         cal = nested_todo;
2199                                 }
2200                         }
2201                 }
2202
2203                 if (cal != NULL) {
2204
2205                         /* Set the message EUID to the iCalendar UID */
2206
2207                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2208                         if (p == NULL) {
2209                                 /* If there's no uid we must generate one */
2210                                 generate_uuid(new_uid);
2211                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
2212                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2213                         }
2214                         if (p != NULL) {
2215                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2216                                 if (!IsEmptyStr(buf)) {
2217                                         if (msg->cm_fields['E'] != NULL) {
2218                                                 free(msg->cm_fields['E']);
2219                                         }
2220                                         msg->cm_fields['E'] = strdup(buf);
2221                                         CtdlLogPrintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", buf);
2222                                 }
2223                         }
2224
2225                         /* Set the message subject to the iCalendar summary */
2226
2227                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
2228                         if (p != NULL) {
2229                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2230                                 if (!IsEmptyStr(buf)) {
2231                                         if (msg->cm_fields['U'] != NULL) {
2232                                                 free(msg->cm_fields['U']);
2233                                         }
2234                                         msg->cm_fields['U'] = strdup(buf);
2235                                 }
2236                         }
2237
2238                         /* Set the message date/time to the iCalendar start time */
2239
2240                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
2241                         if (p != NULL) {
2242                                 time_t idtstart;
2243                                 idtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
2244                                 if (idtstart > 0) {
2245                                         if (msg->cm_fields['T'] != NULL) {
2246                                                 free(msg->cm_fields['T']);
2247                                         }
2248                                         msg->cm_fields['T'] = strdup("000000000000000000");
2249                                         sprintf(msg->cm_fields['T'], "%ld", idtstart);
2250                                 }
2251                         }
2252
2253                 }
2254                 icalcomponent_free(cal);
2255                 if (whole_cal != cal) {
2256                         icalcomponent_free(whole_cal);
2257                 }
2258         }
2259 }
2260
2261
2262
2263
2264 /*
2265  * See if we need to prevent the object from being saved (we don't allow
2266  * MIME types other than text/calendar in "calendar" or "tasks" rooms).
2267  *
2268  * If the message is being saved, we also set various message header fields
2269  * using data found in the iCalendar object.
2270  */
2271 int ical_obj_beforesave(struct CtdlMessage *msg)
2272 {
2273         /* First determine if this is a calendar or tasks room */
2274         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
2275            && (CC->room.QRdefaultview != VIEW_TASKS)
2276         ) {
2277                 return(0);              /* Not an iCalendar-centric room */
2278         }
2279
2280         /* It must be an RFC822 message! */
2281         if (msg->cm_format_type != 4) {
2282                 CtdlLogPrintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
2283                 return(1);              /* You tried to save a non-RFC822 message! */
2284         }
2285
2286         if (msg->cm_fields['M'] == NULL) {
2287                 return(1);              /* You tried to save a null message! */
2288         }
2289
2290         /* Do all of our lovely back-end parsing */
2291         mime_parser(msg->cm_fields['M'],
2292                 NULL,
2293                 *ical_obj_beforesave_backend,
2294                 NULL, NULL,
2295                 (void *)msg,
2296                 0
2297         );
2298
2299         return(0);
2300 }
2301
2302
2303 /*
2304  * Things we need to do after saving a calendar event.
2305  */
2306 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
2307                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2308                 char *encoding, char *cbid, void *cbuserdata)
2309 {
2310         icalcomponent *cal;
2311
2312         /* We're only interested in calendar items here. */
2313         if (  (strcasecmp(cbtype, "text/calendar"))
2314            && (strcasecmp(cbtype, "application/ics")) ) {
2315                 return;
2316         }
2317
2318         /* Hunt for the UID and drop it in
2319          * the "user data" pointer for the MIME parser.  When
2320          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2321          * to that string.
2322          */
2323         if (  (!strcasecmp(cbtype, "text/calendar"))
2324            || (!strcasecmp(cbtype, "application/ics")) ) {
2325                 cal = icalcomponent_new_from_string(content);
2326                 if (cal != NULL) {
2327                         ical_saving_vevent(cal, cal);
2328                         icalcomponent_free(cal);
2329                 }
2330         }
2331 }
2332
2333
2334 /*
2335  * Things we need to do after saving a calendar event.
2336  * (This will start back end tasks such as automatic generation of invitations,
2337  * if such actions are appropriate.)
2338  */
2339 int ical_obj_aftersave(struct CtdlMessage *msg)
2340 {
2341         char roomname[ROOMNAMELEN];
2342
2343         /*
2344          * If this isn't the Calendar> room, no further action is necessary.
2345          */
2346
2347         /* First determine if this is our room */
2348         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2349         if (strcasecmp(roomname, CC->room.QRname)) {
2350                 return(0);      /* Not the Calendar room -- don't do anything. */
2351         }
2352
2353         /* It must be an RFC822 message! */
2354         if (msg->cm_format_type != 4) return(1);
2355
2356         /* Reject null messages */
2357         if (msg->cm_fields['M'] == NULL) return(1);
2358
2359         /* Now recurse through it looking for our icalendar data */
2360         mime_parser(msg->cm_fields['M'],
2361                 NULL,
2362                 *ical_obj_aftersave_backend,
2363                 NULL, NULL,
2364                 NULL,
2365                 0
2366         );
2367
2368         return(0);
2369 }
2370
2371
2372 void ical_session_startup(void) {
2373         CIT_ICAL = malloc(sizeof(struct cit_ical));
2374         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2375 }
2376
2377 void ical_session_shutdown(void) {
2378         free(CIT_ICAL);
2379 }
2380
2381
2382 /*
2383  * Back end for ical_fixed_output()
2384  */
2385 void ical_fixed_output_backend(icalcomponent *cal,
2386                         int recursion_level
2387 ) {
2388         icalcomponent *c;
2389         icalproperty *p;
2390         char buf[256];
2391
2392         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2393         if (p != NULL) {
2394                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2395         }
2396
2397         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2398         if (p != NULL) {
2399                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2400         }
2401
2402         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2403         if (p != NULL) {
2404                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2405         }
2406
2407         /* If the component has attendees, iterate through them. */
2408         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2409                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2410                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2411
2412                         /* screen name or email address */
2413                         strcpy(buf, &buf[7]);
2414                         striplt(buf);
2415                         cprintf("%s ", buf);
2416                 }
2417                 cprintf("\n");
2418         }
2419
2420         /* If the component has subcomponents, recurse through them. */
2421         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2422             (c != 0);
2423             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2424                 /* Recursively process subcomponent */
2425                 ical_fixed_output_backend(c, recursion_level+1);
2426         }
2427 }
2428
2429
2430
2431 /*
2432  * Function to output iCalendar data as plain text.  Nobody uses MSG0
2433  * anymore, so really this is just so we expose the vCard data to the full
2434  * text indexer.
2435  */
2436 void ical_fixed_output(char *ptr, int len) {
2437         icalcomponent *cal;
2438         char *stringy_cal;
2439
2440         stringy_cal = malloc(len + 1);
2441         safestrncpy(stringy_cal, ptr, len + 1);
2442         cal = icalcomponent_new_from_string(stringy_cal);
2443         free(stringy_cal);
2444
2445         if (cal == NULL) {
2446                 return;
2447         }
2448
2449         ical_fixed_output_backend(cal, 0);
2450
2451         /* Free the memory we obtained from libical's constructor */
2452         icalcomponent_free(cal);
2453 }
2454
2455
2456
2457 void serv_calendar_destroy(void)
2458 {
2459         icaltimezone_free_builtin_timezones();
2460 }
2461
2462 /*
2463  * Register this module with the Citadel server.
2464  */
2465 CTDL_MODULE_INIT(calendar)
2466 {
2467         if (!threading)
2468         {
2469
2470                 /* Tell libical to return errors instead of aborting if it gets bad data */
2471                 icalerror_errors_are_fatal = 0;
2472
2473                 /* Use our own application prefix in tzid's generated from system tzdata */
2474                 icaltimezone_set_tzid_prefix("/citadel.org/");
2475
2476                 /* Initialize our hook functions */
2477                 CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2478                 CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2479                 CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2480                 CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2481                 CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2482                 CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2483                 CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2484                 CtdlRegisterFixedOutputHook("application/ics", ical_fixed_output);
2485                 CtdlRegisterCleanupHook(serv_calendar_destroy);
2486         }
2487
2488         /* return our Subversion id for the Log */
2489         return "$Id$";
2490 }