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