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