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  * Backend for ical_hunt_for_conflicts()
 895  */
 896 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
 897         icalcomponent *cal;
 898         struct CtdlMessage *msg = NULL;
 899         struct ical_respond_data ird;
 900         struct icaltimetype t1start, t1end, t2start, t2end;
 901         icalproperty *p;
 902         char conflict_event_uid[SIZ];
 903         char conflict_event_summary[SIZ];
 904         char compare_uid[SIZ];
 905
 906         cal = (icalcomponent *)data;
 907         strcpy(compare_uid, "");
 908         strcpy(conflict_event_uid, "");
 909         strcpy(conflict_event_summary, "");
 910
 911         msg = CtdlFetchMessage(msgnum, 1);
 912         if (msg == NULL) return;
 913         memset(&ird, 0, sizeof ird);
 914         strcpy(ird.desired_partnum, "_HUNT_");
 915         mime_parser(msg->cm_fields['M'],
 916                 NULL,
 917                 *ical_locate_part,              /* callback function */
 918                 NULL, NULL,
 919                 (void *) &ird,                  /* user data */
 920                 0
 921         );
 922         CtdlFreeMessage(msg);
 923
 924         if (ird.cal == NULL) return;
 925
 926         t1start = icaltime_null_time();
 927         t1end = icaltime_null_time();
 928         t2start = icaltime_null_time();
 929         t1end = icaltime_null_time();
 930
 931         /* Now compare cal to ird.cal */
 932         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTSTART_PROPERTY);
 933         if (p == NULL) return;
 934         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 935
 936         p = ical_ctdl_get_subprop(ird.cal, ICAL_DTEND_PROPERTY);
 937         if (p != NULL) t2end = icalproperty_get_dtend(p);
 938
 939         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
 940         if (p == NULL) return;
 941         if (p != NULL) t1start = icalproperty_get_dtstart(p);
 942
 943         p = ical_ctdl_get_subprop(cal, ICAL_DTEND_PROPERTY);
 944         if (p != NULL) t1end = icalproperty_get_dtend(p);
 945
 946         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
 947         if (p != NULL) {
 948                 strcpy(compare_uid, icalproperty_get_comment(p));
 949         }
 950
 951         p = ical_ctdl_get_subprop(ird.cal, ICAL_UID_PROPERTY);
 952         if (p != NULL) {
 953                 strcpy(conflict_event_uid, icalproperty_get_comment(p));
 954         }
 955
 956         p = ical_ctdl_get_subprop(ird.cal, ICAL_SUMMARY_PROPERTY);
 957         if (p != NULL) {
 958                 strcpy(conflict_event_summary, icalproperty_get_comment(p));
 959         }
 960
 961         icalcomponent_free(ird.cal);
 962
 963         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 964                 cprintf("%ld||%s|%s|%d|\n",
 965                         msgnum,
 966                         conflict_event_uid,
 967                         conflict_event_summary,
 968                         (       ((strlen(compare_uid)>0)
 969                                 &&(!strcasecmp(compare_uid,
 970                                 conflict_event_uid))) ? 1 : 0
 971                         )
 972                 );
 973         }
 974 }
 975
 976
 977
 978 /*
 979  * Phase 2 of "hunt for conflicts" operation.
 980  * At this point we have a calendar object which represents the VEVENT that
 981  * we're considering adding to the calendar.  Now hunt through the user's
 982  * calendar room, and output zero or more existing VEVENTs which conflict
 983  * with this one.
 984  */
 985 void ical_hunt_for_conflicts(icalcomponent *cal) {
 986         char hold_rm[ROOMNAMELEN];
 987
 988         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 989
 990         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 991                 getroom(&CC->room, hold_rm);
 992                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
 993                 return;
 994         }
 995
 996         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
 997
 998         CtdlForEachMessage(MSGS_ALL, 0, NULL,
 999                 NULL,
1000                 NULL,
1001                 ical_hunt_for_conflicts_backend,
1002                 (void *) cal
1003         );
1004
1005         cprintf("000\n");
1006         getroom(&CC->room, hold_rm);    /* return to saved room */
1007
1008 }
1009
1010
1011
1012 /*
1013  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1014  */
1015 void ical_conflicts(long msgnum, char *partnum) {
1016         struct CtdlMessage *msg = NULL;
1017         struct ical_respond_data ird;
1018
1019         msg = CtdlFetchMessage(msgnum, 1);
1020         if (msg == NULL) {
1021                 cprintf("%d Message %ld not found.\n",
1022                         ERROR + ILLEGAL_VALUE,
1023                         (long)msgnum
1024                 );
1025                 return;
1026         }
1027
1028         memset(&ird, 0, sizeof ird);
1029         strcpy(ird.desired_partnum, partnum);
1030         mime_parser(msg->cm_fields['M'],
1031                 NULL,
1032                 *ical_locate_part,              /* callback function */
1033                 NULL, NULL,
1034                 (void *) &ird,                  /* user data */
1035                 0
1036         );
1037
1038         CtdlFreeMessage(msg);
1039
1040         if (ird.cal != NULL) {
1041                 ical_hunt_for_conflicts(ird.cal);
1042                 icalcomponent_free(ird.cal);
1043                 return;
1044         }
1045         else {
1046                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1047                 return;
1048         }
1049
1050         /* should never get here */
1051 }
1052
1053
1054
1055 /*
1056  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1057  */
1058 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1059         icalproperty *p;
1060         icalvalue *v;
1061         struct icalperiodtype my_period;
1062
1063         if (cal == NULL) return;
1064         my_period = icalperiodtype_null_period();
1065
1066         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1067                 ical_add_to_freebusy(fb,
1068                         icalcomponent_get_first_component(
1069                                 cal, ICAL_VEVENT_COMPONENT
1070                         )
1071                 );
1072                 return;
1073         }
1074
1075         ical_dezonify(cal);
1076
1077         /* If this event is not opaque, the user isn't publishing it as
1078          * busy time, so don't bother doing anything else.
1079          */
1080         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1081         if (p != NULL) {
1082                 v = icalproperty_get_value(p);
1083                 if (v != NULL) {
1084                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1085                                 return;
1086                         }
1087                 }
1088         }
1089
1090         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1091         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1092         if (p != NULL) {
1093                 my_period.start = icalproperty_get_dtstart(p);
1094         }
1095
1096         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1097         if (p != NULL) {
1098                 my_period.end = icalproperty_get_dtstart(p);
1099         }
1100
1101         /* Now add it. */
1102         icalcomponent_add_property(fb,
1103                 icalproperty_new_freebusy(my_period)
1104         );
1105
1106         /* Make sure the DTSTART property of the freebusy *list* is set to
1107          * the DTSTART property of the *earliest event*.
1108          */
1109         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1110         if (p == NULL) {
1111                 icalcomponent_set_dtstart(fb,
1112                         icalcomponent_get_dtstart(cal) );
1113         }
1114         else {
1115                 if (icaltime_compare(
1116                         icalcomponent_get_dtstart(cal),
1117                         icalcomponent_get_dtstart(fb)
1118                    ) < 0) {
1119                         icalcomponent_set_dtstart(fb,
1120                                 icalcomponent_get_dtstart(cal) );
1121                 }
1122         }
1123
1124         /* Make sure the DTEND property of the freebusy *list* is set to
1125          * the DTEND property of the *latest event*.
1126          */
1127         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1128         if (p == NULL) {
1129                 icalcomponent_set_dtend(fb,
1130                         icalcomponent_get_dtend(cal) );
1131         }
1132         else {
1133                 if (icaltime_compare(
1134                         icalcomponent_get_dtend(cal),
1135                         icalcomponent_get_dtend(fb)
1136                    ) > 0) {
1137                         icalcomponent_set_dtend(fb,
1138                                 icalcomponent_get_dtend(cal) );
1139                 }
1140         }
1141
1142 }
1143
1144
1145
1146 /*
1147  * Backend for ical_freebusy()
1148  *
1149  * This function simply loads the messages in the user's calendar room,
1150  * which contain VEVENTs, then strips them of all non-freebusy data, and
1151  * adds them to the supplied VCALENDAR.
1152  *
1153  */
1154 void ical_freebusy_backend(long msgnum, void *data) {
1155         icalcomponent *cal;
1156         struct CtdlMessage *msg = NULL;
1157         struct ical_respond_data ird;
1158
1159         cal = (icalcomponent *)data;
1160
1161         msg = CtdlFetchMessage(msgnum, 1);
1162         if (msg == NULL) return;
1163         memset(&ird, 0, sizeof ird);
1164         strcpy(ird.desired_partnum, "_HUNT_");
1165         mime_parser(msg->cm_fields['M'],
1166                 NULL,
1167                 *ical_locate_part,              /* callback function */
1168                 NULL, NULL,
1169                 (void *) &ird,                  /* user data */
1170                 0
1171         );
1172         CtdlFreeMessage(msg);
1173
1174         if (ird.cal == NULL) return;
1175
1176         ical_add_to_freebusy(cal, ird.cal);
1177
1178         /* Now free the memory. */
1179         icalcomponent_free(ird.cal);
1180 }
1181
1182
1183
1184 /*
1185  * Grab another user's free/busy times
1186  */
1187 void ical_freebusy(char *who) {
1188         struct ctdluser usbuf;
1189         char calendar_room_name[ROOMNAMELEN];
1190         char hold_rm[ROOMNAMELEN];
1191         char *serialized_request = NULL;
1192         icalcomponent *encaps = NULL;
1193         icalcomponent *fb = NULL;
1194         int found_user = (-1);
1195         struct recptypes *recp = NULL;
1196         char buf[256];
1197         char host[256];
1198         char type[256];
1199         int i = 0;
1200         int config_lines = 0;
1201
1202         /* First try an exact match. */
1203         found_user = getuser(&usbuf, who);
1204
1205         /* If not found, try it as an unqualified email address. */
1206         if (found_user != 0) {
1207                 strcpy(buf, who);
1208                 recp = validate_recipients(buf, NULL, 0);
1209                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1210                 if (recp != NULL) {
1211                         if (recp->num_local == 1) {
1212                                 found_user = getuser(&usbuf, recp->recp_local);
1213                         }
1214                         free_recipients(recp);
1215                 }
1216         }
1217
1218         /* If still not found, try it as an address qualified with the
1219          * primary FQDN of this Citadel node.
1220          */
1221         if (found_user != 0) {
1222                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1223                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1224                 recp = validate_recipients(buf, NULL, 0);
1225                 if (recp != NULL) {
1226                         if (recp->num_local == 1) {
1227                                 found_user = getuser(&usbuf, recp->recp_local);
1228                         }
1229                         free_recipients(recp);
1230                 }
1231         }
1232
1233         /* Still not found?  Try qualifying it with every domain we
1234          * might have addresses in.
1235          */
1236         if (found_user != 0) {
1237                 config_lines = num_tokens(inetcfg, '\n');
1238                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1239                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1240                         extract_token(host, buf, 0, '|', sizeof host);
1241                         extract_token(type, buf, 1, '|', sizeof type);
1242
1243                         if ( (!strcasecmp(type, "localhost"))
1244                            || (!strcasecmp(type, "directory")) ) {
1245                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1246                                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1247                                 recp = validate_recipients(buf, NULL, 0);
1248                                 if (recp != NULL) {
1249                                         if (recp->num_local == 1) {
1250                                                 found_user = getuser(&usbuf, recp->recp_local);
1251                                         }
1252                                         free_recipients(recp);
1253                                 }
1254                         }
1255                 }
1256         }
1257
1258         if (found_user != 0) {
1259                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1260                 return;
1261         }
1262
1263         MailboxName(calendar_room_name, sizeof calendar_room_name,
1264                 &usbuf, USERCALENDARROOM);
1265
1266         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1267
1268         if (getroom(&CC->room, calendar_room_name) != 0) {
1269                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1270                 getroom(&CC->room, hold_rm);
1271                 return;
1272         }
1273
1274         /* Create a VFREEBUSY subcomponent */
1275         CtdlLogPrintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1276         fb = icalcomponent_new_vfreebusy();
1277         if (fb == NULL) {
1278                 cprintf("%d Internal error: cannot allocate memory.\n",
1279                         ERROR + INTERNAL_ERROR);
1280                 getroom(&CC->room, hold_rm);
1281                 return;
1282         }
1283
1284         /* Set the method to PUBLISH */
1285         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1286
1287         /* Set the DTSTAMP to right now. */
1288         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1289
1290         /* Add the user's email address as ORGANIZER */
1291         sprintf(buf, "MAILTO:%s", who);
1292         if (strchr(buf, '@') == NULL) {
1293                 strcat(buf, "@");
1294                 strcat(buf, config.c_fqdn);
1295         }
1296         for (i=0; buf[i]; ++i) {
1297                 if (buf[i]==' ') buf[i] = '_';
1298         }
1299         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1300
1301         /* Add busy time from events */
1302         CtdlLogPrintf(CTDL_DEBUG, "Adding busy time from events\n");
1303         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1304
1305         /* If values for DTSTART and DTEND are still not present, set them
1306          * to yesterday and tomorrow as default values.
1307          */
1308         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1309                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1310         }
1311         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1312                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1313         }
1314
1315         /* Put the freebusy component into the calendar component */
1316         CtdlLogPrintf(CTDL_DEBUG, "Encapsulating\n");
1317         encaps = ical_encapsulate_subcomponent(fb);
1318         if (encaps == NULL) {
1319                 icalcomponent_free(fb);
1320                 cprintf("%d Internal error: cannot allocate memory.\n",
1321                         ERROR + INTERNAL_ERROR);
1322                 getroom(&CC->room, hold_rm);
1323                 return;
1324         }
1325
1326         /* Set the method to PUBLISH */
1327         CtdlLogPrintf(CTDL_DEBUG, "Setting method\n");
1328         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1329
1330         /* Serialize it */
1331         CtdlLogPrintf(CTDL_DEBUG, "Serializing\n");
1332         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1333         icalcomponent_free(encaps);     /* Don't need this anymore. */
1334
1335         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1336         if (serialized_request != NULL) {
1337                 client_write(serialized_request, strlen(serialized_request));
1338                 free(serialized_request);
1339         }
1340         cprintf("\n000\n");
1341
1342         /* Go back to the room from which we came... */
1343         getroom(&CC->room, hold_rm);
1344 }
1345
1346
1347
1348 /*
1349  * Backend for ical_getics()
1350  *
1351  * This is a ForEachMessage() callback function that searches the current room
1352  * for calendar events and adds them each into one big calendar component.
1353  */
1354 void ical_getics_backend(long msgnum, void *data) {
1355         icalcomponent *encaps, *c;
1356         struct CtdlMessage *msg = NULL;
1357         struct ical_respond_data ird;
1358
1359         encaps = (icalcomponent *)data;
1360         if (encaps == NULL) return;
1361
1362         /* Look for the calendar event... */
1363
1364         msg = CtdlFetchMessage(msgnum, 1);
1365         if (msg == NULL) return;
1366         memset(&ird, 0, sizeof ird);
1367         strcpy(ird.desired_partnum, "_HUNT_");
1368         mime_parser(msg->cm_fields['M'],
1369                 NULL,
1370                 *ical_locate_part,              /* callback function */
1371                 NULL, NULL,
1372                 (void *) &ird,                  /* user data */
1373                 0
1374         );
1375         CtdlFreeMessage(msg);
1376
1377         if (ird.cal == NULL) return;
1378
1379         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1380          * are responsible for "the_request"'s memory -- it will be freed
1381          * when we free "encaps".
1382          */
1383
1384         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1385          * in.  This will almost never happen.
1386          */
1387         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1388                 icalcomponent_add_component(encaps, ird.cal);
1389         }
1390         /*
1391          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1392          * and other components encapsulated inside, we have to extract them.
1393          */
1394         else {
1395                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1396                     (c != NULL);
1397                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1398                         icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1399                 }
1400                 icalcomponent_free(ird.cal);
1401         }
1402 }
1403
1404
1405
1406 /*
1407  * Retrieve all of the calendar items in the current room, and output them
1408  * as a single icalendar object.
1409  */
1410 void ical_getics(void)
1411 {
1412         icalcomponent *encaps = NULL;
1413         char *ser = NULL;
1414
1415         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1416            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1417                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1418                 return;         /* Not an iCalendar-centric room */
1419         }
1420
1421         encaps = icalcomponent_new_vcalendar();
1422         if (encaps == NULL) {
1423                 CtdlLogPrintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1424                         __FILE__, __LINE__);
1425                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1426                 return;
1427         }
1428
1429         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1430
1431         /* Set the Product ID */
1432         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1433
1434         /* Set the Version Number */
1435         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1436
1437         /* Set the method to PUBLISH */
1438         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1439
1440         /* Now go through the room encapsulating all calendar items. */
1441         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1442                 NULL,
1443                 NULL,
1444                 ical_getics_backend,
1445                 (void *) encaps
1446         );
1447
1448         ser = strdup(icalcomponent_as_ical_string(encaps));
1449         client_write(ser, strlen(ser));
1450         free(ser);
1451         cprintf("\n000\n");
1452         icalcomponent_free(encaps);     /* Don't need this anymore. */
1453
1454 }
1455
1456
1457 /*
1458  * Delete all of the calendar items in the current room, and replace them
1459  * with calendar items from a client-supplied data stream.
1460  */
1461 void ical_putics(void)
1462 {
1463         char *calstream = NULL;
1464         icalcomponent *cal;
1465         icalcomponent *c;
1466
1467         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1468            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1469                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1470                 return;         /* Not an iCalendar-centric room */
1471         }
1472
1473         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1474                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1475                 return;
1476         }
1477
1478         cprintf("%d Transmit data now\n", SEND_LISTING);
1479         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0, 0);
1480         if (calstream == NULL) {
1481                 return;
1482         }
1483
1484         cal = icalcomponent_new_from_string(calstream);
1485         free(calstream);
1486         ical_dezonify(cal);
1487
1488         /* We got our data stream -- now do something with it. */
1489
1490         /* Delete the existing messages in the room, because we are replacing
1491          * the entire calendar with an entire new (or updated) calendar.
1492          * (Careful: this opens an S_ROOMS critical section!)
1493          */
1494         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1495
1496         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1497          * in.  This will almost never happen.
1498          */
1499         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1500                 ical_write_to_cal(NULL, cal);
1501         }
1502         /*
1503          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1504          * and other components encapsulated inside, we have to extract them.
1505          */
1506         else {
1507                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1508                     (c != NULL);
1509                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1510                         ical_write_to_cal(NULL, c);
1511                 }
1512         }
1513
1514         icalcomponent_free(cal);
1515 }
1516
1517
1518 /*
1519  * All Citadel calendar commands from the client come through here.
1520  */
1521 void cmd_ical(char *argbuf)
1522 {
1523         char subcmd[64];
1524         long msgnum;
1525         char partnum[256];
1526         char action[256];
1527         char who[256];
1528
1529         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1530
1531         /* Allow "test" and "freebusy" subcommands without logging in. */
1532
1533         if (!strcasecmp(subcmd, "test")) {
1534                 cprintf("%d This server supports calendaring\n", CIT_OK);
1535                 return;
1536         }
1537
1538         if (!strcasecmp(subcmd, "freebusy")) {
1539                 extract_token(who, argbuf, 1, '|', sizeof who);
1540                 ical_freebusy(who);
1541                 return;
1542         }
1543
1544         if (!strcasecmp(subcmd, "sgi")) {
1545                 CIT_ICAL->server_generated_invitations =
1546                         (extract_int(argbuf, 1) ? 1 : 0) ;
1547                 cprintf("%d %d\n",
1548                         CIT_OK, CIT_ICAL->server_generated_invitations);
1549                 return;
1550         }
1551
1552         if (CtdlAccessCheck(ac_logged_in)) return;
1553
1554         if (!strcasecmp(subcmd, "respond")) {
1555                 msgnum = extract_long(argbuf, 1);
1556                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1557                 extract_token(action, argbuf, 3, '|', sizeof action);
1558                 ical_respond(msgnum, partnum, action);
1559                 return;
1560         }
1561
1562         if (!strcasecmp(subcmd, "handle_rsvp")) {
1563                 msgnum = extract_long(argbuf, 1);
1564                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1565                 extract_token(action, argbuf, 3, '|', sizeof action);
1566                 ical_handle_rsvp(msgnum, partnum, action);
1567                 return;
1568         }
1569
1570         if (!strcasecmp(subcmd, "conflicts")) {
1571                 msgnum = extract_long(argbuf, 1);
1572                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1573                 ical_conflicts(msgnum, partnum);
1574                 return;
1575         }
1576
1577         if (!strcasecmp(subcmd, "getics")) {
1578                 ical_getics();
1579                 return;
1580         }
1581
1582         if (!strcasecmp(subcmd, "putics")) {
1583                 ical_putics();
1584                 return;
1585         }
1586
1587         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1588 }
1589
1590
1591
1592 /*
1593  * We don't know if the calendar room exists so we just create it at login
1594  */
1595 void ical_create_room(void)
1596 {
1597         struct ctdlroom qr;
1598         struct visit vbuf;
1599
1600         /* Create the calendar room if it doesn't already exist */
1601         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1602
1603         /* Set expiration policy to manual; otherwise objects will be lost! */
1604         if (lgetroom(&qr, USERCALENDARROOM)) {
1605                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1606                 return;
1607         }
1608         qr.QRep.expire_mode = EXPIRE_MANUAL;
1609         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1610         lputroom(&qr);
1611
1612         /* Set the view to a calendar view */
1613         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1614         vbuf.v_view = VIEW_CALENDAR;
1615         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1616
1617         /* Create the tasks list room if it doesn't already exist */
1618         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1619
1620         /* Set expiration policy to manual; otherwise objects will be lost! */
1621         if (lgetroom(&qr, USERTASKSROOM)) {
1622                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1623                 return;
1624         }
1625         qr.QRep.expire_mode = EXPIRE_MANUAL;
1626         qr.QRdefaultview = VIEW_TASKS;
1627         lputroom(&qr);
1628
1629         /* Set the view to a task list view */
1630         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1631         vbuf.v_view = VIEW_TASKS;
1632         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1633
1634         /* Create the notes room if it doesn't already exist */
1635         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1636
1637         /* Set expiration policy to manual; otherwise objects will be lost! */
1638         if (lgetroom(&qr, USERNOTESROOM)) {
1639                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1640                 return;
1641         }
1642         qr.QRep.expire_mode = EXPIRE_MANUAL;
1643         qr.QRdefaultview = VIEW_NOTES;
1644         lputroom(&qr);
1645
1646         /* Set the view to a notes view */
1647         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1648         vbuf.v_view = VIEW_NOTES;
1649         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1650
1651         return;
1652 }
1653
1654
1655 /*
1656  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1657  * finds a VEVENT.
1658  */
1659 void ical_send_out_invitations(icalcomponent *cal) {
1660         icalcomponent *the_request = NULL;
1661         char *serialized_request = NULL;
1662         icalcomponent *encaps = NULL;
1663         char *request_message_text = NULL;
1664         struct CtdlMessage *msg = NULL;
1665         struct recptypes *valid = NULL;
1666         char attendees_string[SIZ];
1667         int num_attendees = 0;
1668         char this_attendee[256];
1669         icalproperty *attendee = NULL;
1670         char summary_string[SIZ];
1671         icalproperty *summary = NULL;
1672         size_t reqsize;
1673
1674         if (cal == NULL) {
1675                 CtdlLogPrintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1676                 return;
1677         }
1678
1679
1680         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1681         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1682                 ical_send_out_invitations(
1683                         icalcomponent_get_first_component(
1684                                 cal, ICAL_VEVENT_COMPONENT
1685                         )
1686                 );
1687                 return;
1688         }
1689
1690         /* Clone the event */
1691         the_request = icalcomponent_new_clone(cal);
1692         if (the_request == NULL) {
1693                 CtdlLogPrintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1694                 return;
1695         }
1696
1697         /* Extract the summary string -- we'll use it as the
1698          * message subject for the request
1699          */
1700         strcpy(summary_string, "Meeting request");
1701         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1702         if (summary != NULL) {
1703                 if (icalproperty_get_summary(summary)) {
1704                         strcpy(summary_string,
1705                                 icalproperty_get_summary(summary) );
1706                 }
1707         }
1708
1709         /* Determine who the recipients of this message are (the attendees) */
1710         strcpy(attendees_string, "");
1711         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1712                 if (icalproperty_get_attendee(attendee)) {
1713                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1714                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1715                                 strcpy(this_attendee, &this_attendee[7]);
1716
1717                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1718                                         snprintf(&attendees_string[strlen(attendees_string)],
1719                                                 sizeof(attendees_string) - strlen(attendees_string),
1720                                                 "%s, ",
1721                                                 this_attendee
1722                                         );
1723                                         ++num_attendees;
1724                                 }
1725                         }
1726                 }
1727         }
1728
1729         CtdlLogPrintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1730
1731         /* If there are no attendees, there are no invitations to send, so...
1732          * don't bother putting one together!  Punch out, Maverick!
1733          */
1734         if (num_attendees == 0) {
1735                 icalcomponent_free(the_request);
1736                 return;
1737         }
1738
1739         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1740         encaps = icalcomponent_new_vcalendar();
1741         if (encaps == NULL) {
1742                 CtdlLogPrintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1743                         __FILE__, __LINE__);
1744                 icalcomponent_free(the_request);
1745                 return;
1746         }
1747
1748         /* Set the Product ID */
1749         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1750
1751         /* Set the Version Number */
1752         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1753
1754         /* Set the method to REQUEST */
1755         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1756
1757         /* Now make sure all of the DTSTART and DTEND properties are UTC. */
1758         ical_dezonify(the_request);
1759
1760         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1761          * are responsible for "the_request"'s memory -- it will be freed
1762          * when we free "encaps".
1763          */
1764         icalcomponent_add_component(encaps, the_request);
1765
1766         /* Serialize it */
1767         serialized_request = strdup(icalcomponent_as_ical_string(encaps));
1768         icalcomponent_free(encaps);     /* Don't need this anymore. */
1769         if (serialized_request == NULL) return;
1770
1771         reqsize = strlen(serialized_request) + SIZ;
1772         request_message_text = malloc(reqsize);
1773         if (request_message_text != NULL) {
1774                 snprintf(request_message_text, reqsize,
1775                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1776                         serialized_request
1777                 );
1778
1779                 msg = CtdlMakeMessage(&CC->user,
1780                         "",                     /* No single recipient here */
1781                         "",                     /* No single recipient here */
1782                         CC->room.QRname, 0, FMT_RFC822,
1783                         "",
1784                         "",
1785                         summary_string,         /* Use summary for subject */
1786                         NULL,
1787                         request_message_text,
1788                         NULL);
1789
1790                 if (msg != NULL) {
1791                         valid = validate_recipients(attendees_string, NULL, 0);
1792                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
1793                         CtdlFreeMessage(msg);
1794                         free_recipients(valid);
1795                 }
1796         }
1797         free(serialized_request);
1798 }
1799
1800
1801 /*
1802  * When a calendar object is being saved, determine whether it's a VEVENT
1803  * and the user saving it is the organizer.  If so, send out invitations
1804  * to any listed attendees.
1805  *
1806  */
1807 void ical_saving_vevent(icalcomponent *cal) {
1808         icalcomponent *c;
1809         icalproperty *organizer = NULL;
1810         char organizer_string[SIZ];
1811
1812         CtdlLogPrintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
1813
1814         /* Don't send out invitations unless the client wants us to. */
1815         if (CIT_ICAL->server_generated_invitations == 0) {
1816                 return;
1817         }
1818
1819         /* Don't send out invitations if we've been asked not to. */
1820         if (CIT_ICAL->avoid_sending_invitations > 0) {
1821                 return;
1822         }
1823
1824         strcpy(organizer_string, "");
1825         /*
1826          * The VEVENT subcomponent is the one we're interested in.
1827          * Send out invitations if, and only if, this user is the Organizer.
1828          */
1829         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1830                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
1831                 if (organizer != NULL) {
1832                         if (icalproperty_get_organizer(organizer)) {
1833                                 strcpy(organizer_string,
1834                                         icalproperty_get_organizer(organizer));
1835                         }
1836                 }
1837                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1838                         strcpy(organizer_string, &organizer_string[7]);
1839                         striplt(organizer_string);
1840                         /*
1841                          * If the user saving the event is listed as the
1842                          * organizer, then send out invitations.
1843                          */
1844                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
1845                                 ical_send_out_invitations(cal);
1846                         }
1847                 }
1848         }
1849
1850         /* If the component has subcomponents, recurse through them. */
1851         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1852             (c != NULL);
1853             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1854                 /* Recursively process subcomponent */
1855                 ical_saving_vevent(c);
1856         }
1857
1858 }
1859
1860
1861
1862 /*
1863  * Back end for ical_obj_beforesave()
1864  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1865  * the summary of the event (becomes message subject),
1866  * and the start time (becomes message date/time).
1867  */
1868 void ical_obj_beforesave_backend(char *name, char *filename, char *partnum,
1869                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1870                 char *encoding, void *cbuserdata)
1871 {
1872         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
1873         icalproperty *p;
1874         char new_uid[256] = "";
1875         char buf[1024] = "";
1876         struct CtdlMessage *msg = (struct CtdlMessage *) cbuserdata;
1877
1878         if (!msg) return;
1879
1880         /* We're only interested in calendar data. */
1881         if (  (strcasecmp(cbtype, "text/calendar"))
1882            && (strcasecmp(cbtype, "application/ics")) ) {
1883                 return;
1884         }
1885
1886         /* Hunt for the UID and drop it in
1887          * the "user data" pointer for the MIME parser.  When
1888          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1889          * to that string.
1890          */
1891         whole_cal = icalcomponent_new_from_string(content);
1892         cal = whole_cal;
1893         if (cal != NULL) {
1894                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1895                         nested_event = icalcomponent_get_first_component(
1896                                 cal, ICAL_VEVENT_COMPONENT);
1897                         if (nested_event != NULL) {
1898                                 cal = nested_event;
1899                         }
1900                         else {
1901                                 nested_todo = icalcomponent_get_first_component(
1902                                         cal, ICAL_VTODO_COMPONENT);
1903                                 if (nested_todo != NULL) {
1904                                         cal = nested_todo;
1905                                 }
1906                         }
1907                 }
1908
1909                 if (cal != NULL) {
1910
1911                         /* Set the message EUID to the iCalendar UID */
1912
1913                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1914                         if (p == NULL) {
1915                                 /* If there's no uid we must generate one */
1916                                 generate_uuid(new_uid);
1917                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
1918                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
1919                         }
1920                         if (p != NULL) {
1921                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
1922                                 if (!IsEmptyStr(buf)) {
1923                                         if (msg->cm_fields['E'] != NULL) {
1924                                                 free(msg->cm_fields['E']);
1925                                         }
1926                                         msg->cm_fields['E'] = strdup(buf);
1927                                         CtdlLogPrintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", buf);
1928                                 }
1929                         }
1930
1931                         /* Set the message subject to the iCalendar summary */
1932
1933                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
1934                         if (p != NULL) {
1935                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
1936                                 if (!IsEmptyStr(buf)) {
1937                                         if (msg->cm_fields['U'] != NULL) {
1938                                                 free(msg->cm_fields['U']);
1939                                         }
1940                                         msg->cm_fields['U'] = strdup(buf);
1941                                 }
1942                         }
1943
1944                         /* Set the message date/time to the iCalendar start time */
1945
1946                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
1947                         if (p != NULL) {
1948                                 time_t idtstart;
1949                                 idtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
1950                                 if (idtstart > 0) {
1951                                         if (msg->cm_fields['T'] != NULL) {
1952                                                 free(msg->cm_fields['T']);
1953                                         }
1954                                         msg->cm_fields['T'] = strdup("000000000000000000");
1955                                         sprintf(msg->cm_fields['T'], "%ld", idtstart);
1956                                 }
1957                         }
1958
1959                 }
1960                 icalcomponent_free(cal);
1961                 if (whole_cal != cal) {
1962                         icalcomponent_free(whole_cal);
1963                 }
1964         }
1965 }
1966
1967
1968
1969
1970 /*
1971  * See if we need to prevent the object from being saved (we don't allow
1972  * MIME types other than text/calendar in "calendar" or "tasks" rooms).
1973  *
1974  * If the message is being saved, we also set various message header fields
1975  * using data found in the iCalendar object.
1976  */
1977 int ical_obj_beforesave(struct CtdlMessage *msg)
1978 {
1979         /* First determine if this is a calendar or tasks room */
1980         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
1981            && (CC->room.QRdefaultview != VIEW_TASKS)
1982         ) {
1983                 return(0);              /* Not an iCalendar-centric room */
1984         }
1985
1986         /* It must be an RFC822 message! */
1987         if (msg->cm_format_type != 4) {
1988                 CtdlLogPrintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
1989                 return(1);              /* You tried to save a non-RFC822 message! */
1990         }
1991
1992         if (msg->cm_fields['M'] == NULL) {
1993                 return(1);              /* You tried to save a null message! */
1994         }
1995
1996         /* Do all of our lovely back-end parsing */
1997         mime_parser(msg->cm_fields['M'],
1998                 NULL,
1999                 *ical_obj_beforesave_backend,
2000                 NULL, NULL,
2001                 (void *)msg,
2002                 0
2003         );
2004
2005         return(0);
2006 }
2007
2008
2009 /*
2010  * Things we need to do after saving a calendar event.
2011  */
2012 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
2013                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2014                 char *encoding, void *cbuserdata)
2015 {
2016         icalcomponent *cal;
2017
2018         /* We're only interested in calendar items here. */
2019         if (  (strcasecmp(cbtype, "text/calendar"))
2020            && (strcasecmp(cbtype, "application/ics")) ) {
2021                 return;
2022         }
2023
2024         /* Hunt for the UID and drop it in
2025          * the "user data" pointer for the MIME parser.  When
2026          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2027          * to that string.
2028          */
2029         if (  (!strcasecmp(cbtype, "text/calendar"))
2030            || (!strcasecmp(cbtype, "application/ics")) ) {
2031                 cal = icalcomponent_new_from_string(content);
2032                 if (cal != NULL) {
2033                         ical_saving_vevent(cal);
2034                         icalcomponent_free(cal);
2035                 }
2036         }
2037 }
2038
2039
2040 /*
2041  * Things we need to do after saving a calendar event.
2042  * (This will start back end tasks such as automatic generation of invitations,
2043  * if such actions are appropriate.)
2044  */
2045 int ical_obj_aftersave(struct CtdlMessage *msg)
2046 {
2047         char roomname[ROOMNAMELEN];
2048
2049         /*
2050          * If this isn't the Calendar> room, no further action is necessary.
2051          */
2052
2053         /* First determine if this is our room */
2054         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2055         if (strcasecmp(roomname, CC->room.QRname)) {
2056                 return(0);      /* Not the Calendar room -- don't do anything. */
2057         }
2058
2059         /* It must be an RFC822 message! */
2060         if (msg->cm_format_type != 4) return(1);
2061
2062         /* Reject null messages */
2063         if (msg->cm_fields['M'] == NULL) return(1);
2064
2065         /* Now recurse through it looking for our icalendar data */
2066         mime_parser(msg->cm_fields['M'],
2067                 NULL,
2068                 *ical_obj_aftersave_backend,
2069                 NULL, NULL,
2070                 NULL,
2071                 0
2072         );
2073
2074         return(0);
2075 }
2076
2077
2078 void ical_session_startup(void) {
2079         CIT_ICAL = malloc(sizeof(struct cit_ical));
2080         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2081 }
2082
2083 void ical_session_shutdown(void) {
2084         free(CIT_ICAL);
2085 }
2086
2087
2088 /*
2089  * Back end for ical_fixed_output()
2090  */
2091 void ical_fixed_output_backend(icalcomponent *cal,
2092                         int recursion_level
2093 ) {
2094         icalcomponent *c;
2095         icalproperty *p;
2096         char buf[256];
2097
2098         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2099         if (p != NULL) {
2100                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2101         }
2102
2103         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2104         if (p != NULL) {
2105                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2106         }
2107
2108         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2109         if (p != NULL) {
2110                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2111         }
2112
2113         /* If the component has attendees, iterate through them. */
2114         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2115                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2116                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2117
2118                         /* screen name or email address */
2119                         strcpy(buf, &buf[7]);
2120                         striplt(buf);
2121                         cprintf("%s ", buf);
2122                 }
2123                 cprintf("\n");
2124         }
2125
2126         /* If the component has subcomponents, recurse through them. */
2127         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2128             (c != 0);
2129             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2130                 /* Recursively process subcomponent */
2131                 ical_fixed_output_backend(c, recursion_level+1);
2132         }
2133 }
2134
2135
2136
2137 /*
2138  * Function to output iCalendar data as plain text.  Nobody uses MSG0
2139  * anymore, so really this is just so we expose the vCard data to the full
2140  * text indexer.
2141  */
2142 void ical_fixed_output(char *ptr, int len) {
2143         icalcomponent *cal;
2144         char *stringy_cal;
2145
2146         stringy_cal = malloc(len + 1);
2147         safestrncpy(stringy_cal, ptr, len + 1);
2148         cal = icalcomponent_new_from_string(stringy_cal);
2149         free(stringy_cal);
2150
2151         if (cal == NULL) {
2152                 return;
2153         }
2154
2155         ical_dezonify(cal);
2156         ical_fixed_output_backend(cal, 0);
2157
2158         /* Free the memory we obtained from libical's constructor */
2159         icalcomponent_free(cal);
2160 }
2161
2162
2163
2164 void serv_calendar_destroy(void)
2165 {
2166         icaltimezone_free_builtin_timezones();
2167 }
2168
2169 /*
2170  * Register this module with the Citadel server.
2171  */
2172 CTDL_MODULE_INIT(calendar)
2173 {
2174         if (!threading)
2175         {
2176                 CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2177                 CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2178                 CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2179                 CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2180                 CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2181                 CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2182                 CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2183                 CtdlRegisterFixedOutputHook("application/ics", ical_fixed_output);
2184                 CtdlRegisterCleanupHook(serv_calendar_destroy);
2185         }
2186
2187         /* return our Subversion id for the Log */
2188         return "$Id$";
2189 }
2190