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