citadel/modules/calendar/serv_calendar.c

   1 /*
   2  * $Id$
   3  *
   4  * This module implements iCalendar object processing and the Calendar>
   5  * room on a Citadel server.  It handles iCalendar objects using the
   6  * iTIP protocol.  See RFCs 2445 and 2446.
   7  *
   8  */
   9
  10 #define PRODID "-//Citadel//NONSGML Citadel Calendar//EN"
  11
  12 #include "sysdep.h"
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <limits.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #ifdef HAVE_STRINGS_H
  20 #include <strings.h>
  21 #endif
  22 #include <libical/ical.h>
  23 #include <libcitadel.h>
  24 #include "citadel.h"
  25 #include "server.h"
  26 #include "citserver.h"
  27 #include "support.h"
  28 #include "config.h"
  29 #include "user_ops.h"
  30 #include "room_ops.h"
  31 #include "msgbase.h"
  32 #include "internet_addressing.h"
  33 #include "serv_calendar.h"
  34 #include "euidindex.h"
  35 #include "ctdl_module.h"
  36 #include "ical_dezonify.h"
  37
  38
  39
  40 struct ical_respond_data {
  41         char desired_partnum[SIZ];
  42         icalcomponent *cal;
  43 };
  44
  45
  46 /*
  47  * Utility function to create a new VCALENDAR component with some of the
  48  * required fields already set the way we like them.
  49  */
  50 icalcomponent *icalcomponent_new_citadel_vcalendar(void) {
  51         icalcomponent *encaps;
  52
  53         encaps = icalcomponent_new_vcalendar();
  54         if (encaps == NULL) {
  55                 CtdlLogPrintf(CTDL_CRIT, "Error at %s:%d - could not allocate component!\n",
  56                         __FILE__, __LINE__);
  57                 return NULL;
  58         }
  59
  60         /* Set the Product ID */
  61         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
  62
  63         /* Set the Version Number */
  64         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
  65
  66         return(encaps);
  67 }
  68
  69
  70 /*
  71  * Utility function to encapsulate a subcomponent into a full VCALENDAR
  72  */
  73 icalcomponent *ical_encapsulate_subcomponent(icalcomponent *subcomp) {
  74         icalcomponent *encaps;
  75
  76         /* If we're already looking at a full VCALENDAR component,
  77          * don't bother ... just return itself.
  78          */
  79         if (icalcomponent_isa(subcomp) == ICAL_VCALENDAR_COMPONENT) {
  80                 return subcomp;
  81         }
  82
  83         /* Encapsulate the VEVENT component into a complete VCALENDAR */
  84         encaps = icalcomponent_new_citadel_vcalendar();
  85         if (encaps == NULL) return NULL;
  86
  87         /* Encapsulate the subcomponent inside */
  88         icalcomponent_add_component(encaps, subcomp);
  89
  90         /* Return the object we just created. */
  91         return(encaps);
  92 }
  93
  94
  95
  96
  97 /*
  98  * Write a calendar object into the specified user's calendar room.
  99  * If the supplied user is NULL, this function writes the calendar object
 100  * to the currently selected room.
 101  */
 102 void ical_write_to_cal(struct ctdluser *u, icalcomponent *cal) {
 103         char *ser = NULL;
 104         icalcomponent *encaps = NULL;
 105         struct CtdlMessage *msg = NULL;
 106         icalcomponent *tmp=NULL;
 107
 108         if (cal == NULL) return;
 109
 110         /* If the supplied object is a subcomponent, encapsulate it in
 111          * a full VCALENDAR component, and save that instead.
 112          */
 113         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
 114                 tmp = icalcomponent_new_clone(cal);
 115                 encaps = ical_encapsulate_subcomponent(tmp);
 116                 ical_write_to_cal(u, encaps);
 117                 icalcomponent_free(tmp);
 118                 icalcomponent_free(encaps);
 119                 return;
 120         }
 121
 122         ser = icalcomponent_as_ical_string_r(cal);
 123         if (ser == NULL) return;
 124
 125         /* If the caller supplied a user, write to that user's default calendar room */
 126         if (u) {
 127                 /* This handy API function does all the work for us. */
 128                 CtdlWriteObject(USERCALENDARROOM,       /* which room */
 129                         "text/calendar",        /* MIME type */
 130                         ser,                    /* data */
 131                         strlen(ser)+1,          /* length */
 132                         u,                      /* which user */
 133                         0,                      /* not binary */
 134                         0,                      /* don't delete others of this type */
 135                         0                       /* no flags */
 136                 );
 137         }
 138
 139         /* If the caller did not supply a user, write to the currently selected room */
 140         if (!u) {
 141                 msg = malloc(sizeof(struct CtdlMessage));
 142                 memset(msg, 0, sizeof(struct CtdlMessage));
 143                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 144                 msg->cm_anon_type = MES_NORMAL;
 145                 msg->cm_format_type = 4;
 146                 msg->cm_fields['A'] = strdup(CC->user.fullname);
 147                 msg->cm_fields['O'] = strdup(CC->room.QRname);
 148                 msg->cm_fields['N'] = strdup(config.c_nodename);
 149                 msg->cm_fields['H'] = strdup(config.c_humannode);
 150                 msg->cm_fields['M'] = malloc(strlen(ser) + 40);
 151                 strcpy(msg->cm_fields['M'], "Content-type: text/calendar\r\n\r\n");
 152                 strcat(msg->cm_fields['M'], ser);
 153
 154                 /* Now write the data */
 155                 CtdlSubmitMsg(msg, NULL, "", QP_EADDR);
 156                 CtdlFreeMessage(msg);
 157         }
 158
 159         /* In either case, now we can free the serialized calendar object */
 160         free(ser);
 161 }
 162
 163
 164 /*
 165  * Send a reply to a meeting invitation.
 166  *
 167  * 'request' is the invitation to reply to.
 168  * 'action' is the string "accept" or "decline" or "tentative".
 169  *
 170  */
 171 void ical_send_a_reply(icalcomponent *request, char *action) {
 172         icalcomponent *the_reply = NULL;
 173         icalcomponent *vevent = NULL;
 174         icalproperty *attendee = NULL;
 175         char attendee_string[SIZ];
 176         icalproperty *organizer = NULL;
 177         char organizer_string[SIZ];
 178         icalproperty *summary = NULL;
 179         char summary_string[SIZ];
 180         icalproperty *me_attend = NULL;
 181         struct recptypes *recp = NULL;
 182         icalparameter *partstat = NULL;
 183         char *serialized_reply = NULL;
 184         char *reply_message_text = NULL;
 185         struct CtdlMessage *msg = NULL;
 186         struct recptypes *valid = NULL;
 187
 188         strcpy(organizer_string, "");
 189         strcpy(summary_string, "Calendar item");
 190
 191         if (request == NULL) {
 192                 CtdlLogPrintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
 193                 return;
 194         }
 195
 196         the_reply = icalcomponent_new_clone(request);
 197         if (the_reply == NULL) {
 198                 CtdlLogPrintf(CTDL_ERR, "ERROR: cannot clone request\n");
 199                 return;
 200         }
 201
 202         /* Change the method from REQUEST to REPLY */
 203         icalcomponent_set_method(the_reply, ICAL_METHOD_REPLY);
 204
 205         vevent = icalcomponent_get_first_component(the_reply, ICAL_VEVENT_COMPONENT);
 206         if (vevent != NULL) {
 207                 /* Hunt for attendees, removing ones that aren't us.
 208                  * (Actually, remove them all, cloning our own one so we can
 209                  * re-insert it later)
 210                  */
 211                 while (attendee = icalcomponent_get_first_property(vevent,
 212                     ICAL_ATTENDEE_PROPERTY), (attendee != NULL)
 213                 ) {
 214                         if (icalproperty_get_attendee(attendee)) {
 215                                 strcpy(attendee_string,
 216                                         icalproperty_get_attendee(attendee) );
 217                                 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
 218                                         strcpy(attendee_string, &attendee_string[7]);
 219                                         striplt(attendee_string);
 220                                         recp = validate_recipients(attendee_string, NULL, 0);
 221                                         if (recp != NULL) {
 222                                                 if (!strcasecmp(recp->recp_local, CC->user.fullname)) {
 223                                                         if (me_attend) icalproperty_free(me_attend);
 224                                                         me_attend = icalproperty_new_clone(attendee);
 225                                                 }
 226                                                 free_recipients(recp);
 227                                         }
 228                                 }
 229                         }
 230                         /* Remove it... */
 231                         icalcomponent_remove_property(vevent, attendee);
 232                         icalproperty_free(attendee);
 233                 }
 234
 235                 /* We found our own address in the attendee list. */
 236                 if (me_attend) {
 237                         /* Change the partstat from NEEDS-ACTION to ACCEPT or DECLINE */
 238                         icalproperty_remove_parameter(me_attend, ICAL_PARTSTAT_PARAMETER);
 239
 240                         if (!strcasecmp(action, "accept")) {
 241                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_ACCEPTED);
 242                         }
 243                         else if (!strcasecmp(action, "decline")) {
 244                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_DECLINED);
 245                         }
 246                         else if (!strcasecmp(action, "tentative")) {
 247                                 partstat = icalparameter_new_partstat(ICAL_PARTSTAT_TENTATIVE);
 248                         }
 249
 250                         if (partstat) icalproperty_add_parameter(me_attend, partstat);
 251
 252                         /* Now insert it back into the vevent. */
 253                         icalcomponent_add_property(vevent, me_attend);
 254                 }
 255
 256                 /* Figure out who to send this thing to */
 257                 organizer = icalcomponent_get_first_property(vevent, ICAL_ORGANIZER_PROPERTY);
 258                 if (organizer != NULL) {
 259                         if (icalproperty_get_organizer(organizer)) {
 260                                 strcpy(organizer_string,
 261                                         icalproperty_get_organizer(organizer) );
 262                         }
 263                 }
 264                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
 265                         strcpy(organizer_string, &organizer_string[7]);
 266                         striplt(organizer_string);
 267                 } else {
 268                         strcpy(organizer_string, "");
 269                 }
 270
 271                 /* Extract the summary string -- we'll use it as the
 272                  * message subject for the reply
 273                  */
 274                 summary = icalcomponent_get_first_property(vevent, ICAL_SUMMARY_PROPERTY);
 275                 if (summary != NULL) {
 276                         if (icalproperty_get_summary(summary)) {
 277                                 strcpy(summary_string,
 278                                         icalproperty_get_summary(summary) );
 279                         }
 280                 }
 281         }
 282
 283         /* Now generate the reply message and send it out. */
 284         serialized_reply = icalcomponent_as_ical_string_r(the_reply);
 285         icalcomponent_free(the_reply);  /* don't need this anymore */
 286         if (serialized_reply == NULL) return;
 287
 288         reply_message_text = malloc(strlen(serialized_reply) + SIZ);
 289         if (reply_message_text != NULL) {
 290                 sprintf(reply_message_text,
 291                         "Content-type: text/calendar; charset=\"utf-8\"\r\n\r\n%s\r\n",
 292                         serialized_reply
 293                 );
 294
 295                 msg = CtdlMakeMessage(&CC->user,
 296                         organizer_string,       /* to */
 297                         "",                     /* cc */
 298                         CC->room.QRname, 0, FMT_RFC822,
 299                         "",
 300                         "",
 301                         summary_string,         /* Use summary for subject */
 302                         NULL,
 303                         reply_message_text,
 304                         NULL);
 305
 306                 if (msg != NULL) {
 307                         valid = validate_recipients(organizer_string, NULL, 0);
 308                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
 309                         CtdlFreeMessage(msg);
 310                         free_recipients(valid);
 311                 }
 312         }
 313         free(serialized_reply);
 314 }
 315
 316
 317
 318 /*
 319  * Callback function for mime parser that hunts for calendar content types
 320  * and turns them into calendar objects
 321  */
 322 void ical_locate_part(char *name, char *filename, char *partnum, char *disp,
 323                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 324                 char *cbid, void *cbuserdata) {
 325
 326         struct ical_respond_data *ird = NULL;
 327
 328         ird = (struct ical_respond_data *) cbuserdata;
 329
 330         /* desired_partnum can be set to "_HUNT_" to have it just look for
 331          * the first part with a content type of text/calendar.  Otherwise
 332          * we have to only process the right one.
 333          */
 334         if (strcasecmp(ird->desired_partnum, "_HUNT_")) {
 335                 if (strcasecmp(partnum, ird->desired_partnum)) {
 336                         return;
 337                 }
 338         }
 339
 340         if (  (strcasecmp(cbtype, "text/calendar"))
 341            && (strcasecmp(cbtype, "application/ics")) ) {
 342                 return;
 343         }
 344
 345         if (ird->cal != NULL) {
 346                 icalcomponent_free(ird->cal);
 347                 ird->cal = NULL;
 348         }
 349
 350         ird->cal = icalcomponent_new_from_string(content);
 351 }
 352
 353
 354 /*
 355  * Respond to a meeting request.
 356  */
 357 void ical_respond(long msgnum, char *partnum, char *action) {
 358         struct CtdlMessage *msg = NULL;
 359         struct ical_respond_data ird;
 360
 361         if (
 362            (strcasecmp(action, "accept"))
 363            && (strcasecmp(action, "decline"))
 364         ) {
 365                 cprintf("%d Action must be 'accept' or 'decline'\n",
 366                         ERROR + ILLEGAL_VALUE
 367                 );
 368                 return;
 369         }
 370
 371         msg = CtdlFetchMessage(msgnum, 1);
 372         if (msg == NULL) {
 373                 cprintf("%d Message %ld not found.\n",
 374                         ERROR + ILLEGAL_VALUE,
 375                         (long)msgnum
 376                 );
 377                 return;
 378         }
 379
 380         memset(&ird, 0, sizeof ird);
 381         strcpy(ird.desired_partnum, partnum);
 382         mime_parser(msg->cm_fields['M'],
 383                 NULL,
 384                 *ical_locate_part,              /* callback function */
 385                 NULL, NULL,
 386                 (void *) &ird,                  /* user data */
 387                 0
 388         );
 389
 390         /* We're done with the incoming message, because we now have a
 391          * calendar object in memory.
 392          */
 393         CtdlFreeMessage(msg);
 394
 395         /*
 396          * Here is the real meat of this function.  Handle the event.
 397          */
 398         if (ird.cal != NULL) {
 399                 /* Save this in the user's calendar if necessary */
 400                 if (!strcasecmp(action, "accept")) {
 401                         ical_write_to_cal(&CC->user, ird.cal);
 402                 }
 403
 404                 /* Send a reply if necessary */
 405                 if (icalcomponent_get_method(ird.cal) == ICAL_METHOD_REQUEST) {
 406                         ical_send_a_reply(ird.cal, action);
 407                 }
 408
 409                 /* We used to delete the invitation after handling it.
 410                  * We don't do that anymore, but here is the code that handled it:
 411                  * CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 412                  */
 413
 414                 /* Free the memory we allocated and return a response. */
 415                 icalcomponent_free(ird.cal);
 416                 ird.cal = NULL;
 417                 cprintf("%d ok\n", CIT_OK);
 418                 return;
 419         }
 420         else {
 421                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 422                 return;
 423         }
 424
 425         /* should never get here */
 426 }
 427
 428
 429 /*
 430  * Figure out the UID of the calendar event being referred to in a
 431  * REPLY object.  This function is recursive.
 432  */
 433 void ical_learn_uid_of_reply(char *uidbuf, icalcomponent *cal) {
 434         icalcomponent *subcomponent;
 435         icalproperty *p;
 436
 437         /* If this object is a REPLY, then extract the UID. */
 438         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
 439                 p = icalcomponent_get_first_property(cal, ICAL_UID_PROPERTY);
 440                 if (p != NULL) {
 441                         strcpy(uidbuf, icalproperty_get_comment(p));
 442                 }
 443         }
 444
 445         /* Otherwise, recurse through any VEVENT subcomponents.  We do NOT want the
 446          * UID of the reply; we want the UID of the invitation being replied to.
 447          */
 448         for (subcomponent = icalcomponent_get_first_component(cal, ICAL_VEVENT_COMPONENT);
 449             subcomponent != NULL;
 450             subcomponent = icalcomponent_get_next_component(cal, ICAL_VEVENT_COMPONENT) ) {
 451                 ical_learn_uid_of_reply(uidbuf, subcomponent);
 452         }
 453 }
 454
 455
 456 /*
 457  * ical_update_my_calendar_with_reply() refers to this callback function; when we
 458  * locate the message containing the calendar event we're replying to, this function
 459  * gets called.  It basically just sticks the message number in a supplied buffer.
 460  */
 461 void ical_hunt_for_event_to_update(long msgnum, void *data) {
 462         long *msgnumptr;
 463
 464         msgnumptr = (long *) data;
 465         *msgnumptr = msgnum;
 466 }
 467
 468
 469 struct original_event_container {
 470         icalcomponent *c;
 471 };
 472
 473 /*
 474  * Callback function for mime parser that hunts for calendar content types
 475  * and turns them into calendar objects (called by ical_update_my_calendar_with_reply()
 476  * to fetch the object being updated)
 477  */
 478 void ical_locate_original_event(char *name, char *filename, char *partnum, char *disp,
 479                 void *content, char *cbtype, char *cbcharset, size_t length, char *encoding,
 480                 char *cbid, void *cbuserdata) {
 481
 482         struct original_event_container *oec = NULL;
 483
 484         if (  (strcasecmp(cbtype, "text/calendar"))
 485            && (strcasecmp(cbtype, "application/ics")) ) {
 486                 return;
 487         }
 488         oec = (struct original_event_container *) cbuserdata;
 489         if (oec->c != NULL) {
 490                 icalcomponent_free(oec->c);
 491         }
 492         oec->c = icalcomponent_new_from_string(content);
 493 }
 494
 495
 496 /*
 497  * Merge updated attendee information from a REPLY into an existing event.
 498  */
 499 void ical_merge_attendee_reply(icalcomponent *event, icalcomponent *reply) {
 500         icalcomponent *c;
 501         icalproperty *e_attendee, *r_attendee;
 502
 503         /* First things first.  If we're not looking at a VEVENT component,
 504          * recurse through subcomponents until we find one.
 505          */
 506         if (icalcomponent_isa(event) != ICAL_VEVENT_COMPONENT) {
 507                 for (c = icalcomponent_get_first_component(event, ICAL_VEVENT_COMPONENT);
 508                     c != NULL;
 509                     c = icalcomponent_get_next_component(event, ICAL_VEVENT_COMPONENT) ) {
 510                         ical_merge_attendee_reply(c, reply);
 511                 }
 512                 return;
 513         }
 514
 515         /* Now do the same thing with the reply.
 516          */
 517         if (icalcomponent_isa(reply) != ICAL_VEVENT_COMPONENT) {
 518                 for (c = icalcomponent_get_first_component(reply, ICAL_VEVENT_COMPONENT);
 519                     c != NULL;
 520                     c = icalcomponent_get_next_component(reply, ICAL_VEVENT_COMPONENT) ) {
 521                         ical_merge_attendee_reply(event, c);
 522                 }
 523                 return;
 524         }
 525
 526         /* Clone the reply, because we're going to rip its guts out. */
 527         reply = icalcomponent_new_clone(reply);
 528
 529         /* At this point we're looking at the correct subcomponents.
 530          * Iterate through the attendees looking for a match.
 531          */
 532 STARTOVER:
 533         for (e_attendee = icalcomponent_get_first_property(event, ICAL_ATTENDEE_PROPERTY);
 534             e_attendee != NULL;
 535             e_attendee = icalcomponent_get_next_property(event, ICAL_ATTENDEE_PROPERTY)) {
 536
 537                 for (r_attendee = icalcomponent_get_first_property(reply, ICAL_ATTENDEE_PROPERTY);
 538                     r_attendee != NULL;
 539                     r_attendee = icalcomponent_get_next_property(reply, ICAL_ATTENDEE_PROPERTY)) {
 540
 541                         /* Check to see if these two attendees match...
 542                          */
 543                         if (!strcasecmp(
 544                            icalproperty_get_attendee(e_attendee),
 545                            icalproperty_get_attendee(r_attendee)
 546                         )) {
 547                                 /* ...and if they do, remove the attendee from the event
 548                                  * and replace it with the attendee from the reply.  (The
 549                                  * reply's copy will have the same address, but an updated
 550                                  * status.)
 551                                  */
 552                                 icalcomponent_remove_property(event, e_attendee);
 553                                 icalproperty_free(e_attendee);
 554                                 icalcomponent_remove_property(reply, r_attendee);
 555                                 icalcomponent_add_property(event, r_attendee);
 556
 557                                 /* Since we diddled both sets of attendees, we have to start
 558                                  * the iteration over again.  This will not create an infinite
 559                                  * loop because we removed the attendee from the reply.  (That's
 560                                  * why we cloned the reply, and that's what we mean by "ripping
 561                                  * its guts out.")
 562                                  */
 563                                 goto STARTOVER;
 564                         }
 565
 566                 }
 567         }
 568
 569         /* Free the *clone* of the reply. */
 570         icalcomponent_free(reply);
 571 }
 572
 573
 574
 575
 576 /*
 577  * Handle an incoming RSVP (object with method==ICAL_METHOD_REPLY) for a
 578  * calendar event.  The object has already been deserialized for us; all
 579  * we have to do here is hunt for the event in our calendar, merge in the
 580  * updated attendee status, and save it again.
 581  *
 582  * This function returns 0 on success, 1 if the event was not found in the
 583  * user's calendar, or 2 if an internal error occurred.
 584  */
 585 int ical_update_my_calendar_with_reply(icalcomponent *cal) {
 586         char uid[SIZ];
 587         char hold_rm[ROOMNAMELEN];
 588         long msgnum_being_replaced = 0;
 589         struct CtdlMessage *msg = NULL;
 590         struct original_event_container oec;
 591         icalcomponent *original_event;
 592         char *serialized_event = NULL;
 593         char roomname[ROOMNAMELEN];
 594         char *message_text = NULL;
 595
 596         /* Figure out just what event it is we're dealing with */
 597         strcpy(uid, "--==<< InVaLiD uId >>==--");
 598         ical_learn_uid_of_reply(uid, cal);
 599         CtdlLogPrintf(CTDL_DEBUG, "UID of event being replied to is <%s>\n", uid);
 600
 601         strcpy(hold_rm, CC->room.QRname);       /* save current room */
 602
 603         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
 604                 getroom(&CC->room, hold_rm);
 605                 CtdlLogPrintf(CTDL_CRIT, "cannot get user calendar room\n");
 606                 return(2);
 607         }
 608
 609         /*
 610          * Look in the EUID index for a message with
 611          * the Citadel EUID set to the value we're looking for.  Since
 612          * Citadel always sets the message EUID to the iCalendar UID of
 613          * the event, this will work.
 614          */
 615         msgnum_being_replaced = locate_message_by_euid(uid, &CC->room);
 616
 617         getroom(&CC->room, hold_rm);    /* return to saved room */
 618
 619         CtdlLogPrintf(CTDL_DEBUG, "msgnum_being_replaced == %ld\n", msgnum_being_replaced);
 620         if (msgnum_being_replaced == 0) {
 621                 return(1);                      /* no calendar event found */
 622         }
 623
 624         /* Now we know the ID of the message containing the event being updated.
 625          * We don't actually have to delete it; that'll get taken care of by the
 626          * server when we save another event with the same UID.  This just gives
 627          * us the ability to load the event into memory so we can diddle the
 628          * attendees.
 629          */
 630         msg = CtdlFetchMessage(msgnum_being_replaced, 1);
 631         if (msg == NULL) {
 632                 return(2);                      /* internal error */
 633         }
 634         oec.c = NULL;
 635         mime_parser(msg->cm_fields['M'],
 636                 NULL,
 637                 *ical_locate_original_event,    /* callback function */
 638                 NULL, NULL,
 639                 &oec,                           /* user data */
 640                 0
 641         );
 642         CtdlFreeMessage(msg);
 643
 644         original_event = oec.c;
 645         if (original_event == NULL) {
 646                 CtdlLogPrintf(CTDL_ERR, "ERROR: Original_component is NULL.\n");
 647                 return(2);
 648         }
 649
 650         /* Merge the attendee's updated status into the event */
 651         ical_merge_attendee_reply(original_event, cal);
 652
 653         /* Serialize it */
 654         serialized_event = icalcomponent_as_ical_string_r(original_event);
 655         icalcomponent_free(original_event);     /* Don't need this anymore. */
 656         if (serialized_event == NULL) return(2);
 657
 658         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
 659
 660         message_text = malloc(strlen(serialized_event) + SIZ);
 661         if (message_text != NULL) {
 662                 sprintf(message_text,
 663                         "Content-type: text/calendar; charset=\"utf-8\"\r\n\r\n%s\r\n",
 664                         serialized_event
 665                 );
 666
 667                 msg = CtdlMakeMessage(&CC->user,
 668                         "",                     /* No recipient */
 669                         "",                     /* No recipient */
 670                         roomname,
 671                         0, FMT_RFC822,
 672                         "",
 673                         "",
 674                         "",             /* no subject */
 675                         NULL,
 676                         message_text,
 677                         NULL);
 678
 679                 if (msg != NULL) {
 680                         CIT_ICAL->avoid_sending_invitations = 1;
 681                         CtdlSubmitMsg(msg, NULL, roomname, QP_EADDR);
 682                         CtdlFreeMessage(msg);
 683                         CIT_ICAL->avoid_sending_invitations = 0;
 684                 }
 685         }
 686         free(serialized_event);
 687         return(0);
 688 }
 689
 690
 691 /*
 692  * Handle an incoming RSVP for an event.  (This is the server subcommand part; it
 693  * simply extracts the calendar object from the message, deserializes it, and
 694  * passes it up to ical_update_my_calendar_with_reply() for processing.
 695  */
 696 void ical_handle_rsvp(long msgnum, char *partnum, char *action) {
 697         struct CtdlMessage *msg = NULL;
 698         struct ical_respond_data ird;
 699         int ret;
 700
 701         if (
 702            (strcasecmp(action, "update"))
 703            && (strcasecmp(action, "ignore"))
 704         ) {
 705                 cprintf("%d Action must be 'update' or 'ignore'\n",
 706                         ERROR + ILLEGAL_VALUE
 707                 );
 708                 return;
 709         }
 710
 711         msg = CtdlFetchMessage(msgnum, 1);
 712         if (msg == NULL) {
 713                 cprintf("%d Message %ld not found.\n",
 714                         ERROR + ILLEGAL_VALUE,
 715                         (long)msgnum
 716                 );
 717                 return;
 718         }
 719
 720         memset(&ird, 0, sizeof ird);
 721         strcpy(ird.desired_partnum, partnum);
 722         mime_parser(msg->cm_fields['M'],
 723                 NULL,
 724                 *ical_locate_part,              /* callback function */
 725                 NULL, NULL,
 726                 (void *) &ird,                  /* user data */
 727                 0
 728         );
 729
 730         /* We're done with the incoming message, because we now have a
 731          * calendar object in memory.
 732          */
 733         CtdlFreeMessage(msg);
 734
 735         /*
 736          * Here is the real meat of this function.  Handle the event.
 737          */
 738         if (ird.cal != NULL) {
 739                 /* Update the user's calendar if necessary */
 740                 if (!strcasecmp(action, "update")) {
 741                         ret = ical_update_my_calendar_with_reply(ird.cal);
 742                         if (ret == 0) {
 743                                 cprintf("%d Your calendar has been updated with this reply.\n",
 744                                         CIT_OK);
 745                         }
 746                         else if (ret == 1) {
 747                                 cprintf("%d This event does not exist in your calendar.\n",
 748                                         ERROR + FILE_NOT_FOUND);
 749                         }
 750                         else {
 751                                 cprintf("%d An internal error occurred.\n",
 752                                         ERROR + INTERNAL_ERROR);
 753                         }
 754                 }
 755                 else {
 756                         cprintf("%d This reply has been ignored.\n", CIT_OK);
 757                 }
 758
 759                 /* Now that we've processed this message, we don't need it
 760                  * anymore.  So delete it.  (Don't do this anymore.)
 761                 CtdlDeleteMessages(CC->room.QRname, &msgnum, 1, "");
 762                  */
 763
 764                 /* Free the memory we allocated and return a response. */
 765                 icalcomponent_free(ird.cal);
 766                 ird.cal = NULL;
 767                 return;
 768         }
 769         else {
 770                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
 771                 return;
 772         }
 773
 774         /* should never get here */
 775 }
 776
 777
 778 /*
 779  * Search for a property in both the top level and in a VEVENT subcomponent
 780  */
 781 icalproperty *ical_ctdl_get_subprop(
 782                 icalcomponent *cal,
 783                 icalproperty_kind which_prop
 784 ) {
 785         icalproperty *p;
 786         icalcomponent *c;
 787
 788         p = icalcomponent_get_first_property(cal, which_prop);
 789         if (p == NULL) {
 790                 c = icalcomponent_get_first_component(cal,
 791                                                         ICAL_VEVENT_COMPONENT);
 792                 if (c != NULL) {
 793                         p = icalcomponent_get_first_property(c, which_prop);
 794                 }
 795         }
 796         return p;
 797 }
 798
 799
 800 /*
 801  * Check to see if two events overlap.  Returns nonzero if they do.
 802  * (This function is used in both Citadel and WebCit.  If you change it in
 803  * one place, change it in the other.  Better yet, put it in a library.)
 804  */
 805 int ical_ctdl_is_overlap(
 806                         struct icaltimetype t1start,
 807                         struct icaltimetype t1end,
 808                         struct icaltimetype t2start,
 809                         struct icaltimetype t2end
 810 ) {
 811
 812         if (icaltime_is_null_time(t1start)) return(0);
 813         if (icaltime_is_null_time(t2start)) return(0);
 814
 815         /* First, check for all-day events */
 816         if (t1start.is_date) {
 817                 if (!icaltime_compare_date_only(t1start, t2start)) {
 818                         return(1);
 819                 }
 820                 if (!icaltime_is_null_time(t2end)) {
 821                         if (!icaltime_compare_date_only(t1start, t2end)) {
 822                                 return(1);
 823                         }
 824                 }
 825         }
 826
 827         if (t2start.is_date) {
 828                 if (!icaltime_compare_date_only(t2start, t1start)) {
 829                         return(1);
 830                 }
 831                 if (!icaltime_is_null_time(t1end)) {
 832                         if (!icaltime_compare_date_only(t2start, t1end)) {
 833                                 return(1);
 834                         }
 835                 }
 836         }
 837
 838         /* Now check for overlaps using date *and* time. */
 839
 840         /* First, bail out if either event 1 or event 2 is missing end time. */
 841         if (icaltime_is_null_time(t1end)) return(0);
 842         if (icaltime_is_null_time(t2end)) return(0);
 843
 844         /* If event 1 ends before event 2 starts, we're in the clear. */
 845         if (icaltime_compare(t1end, t2start) <= 0) return(0);
 846
 847         /* If event 2 ends before event 1 starts, we're also ok. */
 848         if (icaltime_compare(t2end, t1start) <= 0) return(0);
 849
 850         /* Otherwise, they overlap. */
 851         return(1);
 852 }
 853
 854
 855
 856 /*
 857  * Phase 6 of "hunt for conflicts"
 858  * called by ical_conflicts_phase5()
 859  *
 860  * Now both the proposed and existing events have been boiled down to start and end times.
 861  * Check for overlap and output any conflicts.
 862  */
 863 void ical_conflicts_phase6(struct icaltimetype t1start,
 864                         struct icaltimetype t1end,
 865                         struct icaltimetype t2start,
 866                         struct icaltimetype t2end,
 867                         long existing_msgnum,
 868                         char *conflict_event_uid,
 869                         char *conflict_event_summary,
 870                         char *compare_uid)
 871 {
 872
 873         /* debugging cruft */
 874         //      time_t tt;
 875         //      tt = icaltime_as_timet(t1start);
 876         //      CtdlLogPrintf(CTDL_DEBUG, "PROPOSED START: %s", ctime(&tt));
 877         //      tt = icaltime_as_timet(t1end);
 878         //      CtdlLogPrintf(CTDL_DEBUG, "  PROPOSED END: %s", ctime(&tt));
 879         //      tt = icaltime_as_timet(t2start);
 880         //      CtdlLogPrintf(CTDL_DEBUG, "EXISTING START: %s", ctime(&tt));
 881         //      tt = icaltime_as_timet(t2end);
 882         //      CtdlLogPrintf(CTDL_DEBUG, "  EXISTING END: %s", ctime(&tt));
 883
 884         /* compare and output */
 885
 886         if (ical_ctdl_is_overlap(t1start, t1end, t2start, t2end)) {
 887                 cprintf("%ld||%s|%s|%d|\n",
 888                         existing_msgnum,
 889                         conflict_event_uid,
 890                         conflict_event_summary,
 891                         (       ((strlen(compare_uid)>0)
 892                                 &&(!strcasecmp(compare_uid,
 893                                 conflict_event_uid))) ? 1 : 0
 894                         )
 895                 );
 896         }
 897
 898 }
 899
 900
 901
 902 /*
 903  * Phase 5 of "hunt for conflicts"
 904  * Called by ical_conflicts_phase4()
 905  *
 906  * We have the proposed event boiled down to start and end times.
 907  * Now check it against an existing event.
 908  */
 909 void ical_conflicts_phase5(struct icaltimetype t1start,
 910                         struct icaltimetype t1end,
 911                         icalcomponent *existing_event,
 912                         long existing_msgnum,
 913                         char *compare_uid)
 914 {
 915         char conflict_event_uid[SIZ];
 916         char conflict_event_summary[SIZ];
 917         struct icaltimetype t2start, t2end;
 918         icalproperty *p;
 919
 920         /* recur variables */
 921         icalproperty *rrule = NULL;
 922         struct icalrecurrencetype recur;
 923         icalrecur_iterator *ritr = NULL;
 924         struct icaldurationtype dur;
 925         int num_recur = 0;
 926
 927         /* initialization */
 928         strcpy(conflict_event_uid, "");
 929         strcpy(conflict_event_summary, "");
 930         t2start = icaltime_null_time();
 931         t2end = icaltime_null_time();
 932
 933         /* existing event stuff */
 934         p = ical_ctdl_get_subprop(existing_event, ICAL_DTSTART_PROPERTY);
 935         if (p == NULL) return;
 936         if (p != NULL) t2start = icalproperty_get_dtstart(p);
 937
 938         p = ical_ctdl_get_subprop(existing_event, ICAL_DTEND_PROPERTY);
 939         if (p != NULL) {
 940                 t2end = icalproperty_get_dtend(p);
 941                 dur = icaltime_subtract(t2end, t2start);
 942         }
 943
 944         rrule = ical_ctdl_get_subprop(existing_event, ICAL_RRULE_PROPERTY);
 945         if (rrule) {
 946                 recur = icalproperty_get_rrule(rrule);
 947                 ritr = icalrecur_iterator_new(recur, t2start);
 948                 CtdlLogPrintf(CTDL_DEBUG, "Recurrence found: %s\n", icalrecurrencetype_as_string(&recur));
 949         }
 950
 951         do {
 952                 p = ical_ctdl_get_subprop(existing_event, ICAL_UID_PROPERTY);
 953                 if (p != NULL) {
 954                         strcpy(conflict_event_uid, icalproperty_get_comment(p));
 955                 }
 956
 957                 p = ical_ctdl_get_subprop(existing_event, ICAL_SUMMARY_PROPERTY);
 958                 if (p != NULL) {
 959                         strcpy(conflict_event_summary, icalproperty_get_comment(p));
 960                 }
 961
 962                 ical_conflicts_phase6(t1start, t1end, t2start, t2end,
 963                         existing_msgnum, conflict_event_uid, conflict_event_summary, compare_uid
 964                 );
 965
 966                 if (rrule) {
 967                         t2start = icalrecur_iterator_next(ritr);
 968                         if (!icaltime_is_null_time(t2end)) {
 969                                 t2end = icaltime_add(t2start, dur);
 970                         }
 971                         ++num_recur;
 972                 }
 973
 974         } while ( (rrule) && (!icaltime_is_null_time(t2start)) && (num_recur < MAX_RECUR) );
 975         icalrecur_iterator_free(ritr);
 976         if (num_recur > 0) CtdlLogPrintf(CTDL_DEBUG, "Iterated over existing event %d times.\n", num_recur);
 977 }
 978
 979
 980
 981
 982 /*
 983  * Phase 4 of "hunt for conflicts"
 984  * Called by ical_hunt_for_conflicts_backend()
 985  *
 986  * At this point we've got it boiled down to two icalcomponent events in memory.
 987  * If they conflict, output something to the client.
 988  */
 989 void ical_conflicts_phase4(icalcomponent *proposed_event,
 990                 icalcomponent *existing_event,
 991                 long existing_msgnum)
 992 {
 993         struct icaltimetype t1start, t1end;
 994         t1start = icaltime_null_time();
 995         t1end = icaltime_null_time();
 996         icalproperty *p;
 997         char compare_uid[SIZ];
 998
 999         /* recur variables */
1000         icalproperty *rrule = NULL;
1001         struct icalrecurrencetype recur;
1002         icalrecur_iterator *ritr = NULL;
1003         struct icaldurationtype dur;
1004         int num_recur = 0;
1005
1006         /* initialization */
1007         strcpy(compare_uid, "");
1008
1009         /* proposed event stuff */
1010
1011         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTSTART_PROPERTY);
1012         if (p == NULL) return;
1013         if (p != NULL) t1start = icalproperty_get_dtstart(p);
1014
1015         p = ical_ctdl_get_subprop(proposed_event, ICAL_DTEND_PROPERTY);
1016         if (p != NULL) {
1017                 t1end = icalproperty_get_dtend(p);
1018                 dur = icaltime_subtract(t1end, t1start);
1019         }
1020
1021         rrule = ical_ctdl_get_subprop(proposed_event, ICAL_RRULE_PROPERTY);
1022         if (rrule) {
1023                 recur = icalproperty_get_rrule(rrule);
1024                 ritr = icalrecur_iterator_new(recur, t1start);
1025                 CtdlLogPrintf(CTDL_DEBUG, "Recurrence found: %s\n", icalrecurrencetype_as_string(&recur));
1026         }
1027
1028         p = ical_ctdl_get_subprop(proposed_event, ICAL_UID_PROPERTY);
1029         if (p != NULL) {
1030                 strcpy(compare_uid, icalproperty_get_comment(p));
1031         }
1032
1033         do {
1034                 ical_conflicts_phase5(t1start, t1end, existing_event, existing_msgnum, compare_uid);
1035
1036                 if (rrule) {
1037                         t1start = icalrecur_iterator_next(ritr);
1038                         if (!icaltime_is_null_time(t1end)) {
1039                                 t1end = icaltime_add(t1start, dur);
1040                         }
1041                         ++num_recur;
1042                 }
1043
1044         } while ( (rrule) && (!icaltime_is_null_time(t1start)) && (num_recur < MAX_RECUR) );
1045         icalrecur_iterator_free(ritr);
1046         if (num_recur > 0) CtdlLogPrintf(CTDL_DEBUG, "Iterated over proposed event %d times.\n", num_recur);
1047 }
1048
1049
1050
1051 /*
1052  * Phase 3 of "hunt for conflicts"
1053  * Called by ical_hunt_for_conflicts()
1054  */
1055 void ical_hunt_for_conflicts_backend(long msgnum, void *data) {
1056         icalcomponent *proposed_event;
1057         struct CtdlMessage *msg = NULL;
1058         struct ical_respond_data ird;
1059
1060         proposed_event = (icalcomponent *)data;
1061
1062         msg = CtdlFetchMessage(msgnum, 1);
1063         if (msg == NULL) return;
1064         memset(&ird, 0, sizeof ird);
1065         strcpy(ird.desired_partnum, "_HUNT_");
1066         mime_parser(msg->cm_fields['M'],
1067                 NULL,
1068                 *ical_locate_part,              /* callback function */
1069                 NULL, NULL,
1070                 (void *) &ird,                  /* user data */
1071                 0
1072         );
1073         CtdlFreeMessage(msg);
1074
1075         if (ird.cal == NULL) return;
1076
1077         ical_conflicts_phase4(proposed_event, ird.cal, msgnum);
1078         icalcomponent_free(ird.cal);
1079 }
1080
1081
1082
1083 /*
1084  * Phase 2 of "hunt for conflicts" operation.
1085  * At this point we have a calendar object which represents the VEVENT that
1086  * is proposed for addition to the calendar.  Now hunt through the user's
1087  * calendar room, and output zero or more existing VEVENTs which conflict
1088  * with this one.
1089  */
1090 void ical_hunt_for_conflicts(icalcomponent *cal) {
1091         char hold_rm[ROOMNAMELEN];
1092
1093         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1094
1095         if (getroom(&CC->room, USERCALENDARROOM) != 0) {
1096                 getroom(&CC->room, hold_rm);
1097                 cprintf("%d You do not have a calendar.\n", ERROR + ROOM_NOT_FOUND);
1098                 return;
1099         }
1100
1101         cprintf("%d Conflicting events:\n", LISTING_FOLLOWS);
1102
1103         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1104                 NULL,
1105                 NULL,
1106                 ical_hunt_for_conflicts_backend,
1107                 (void *) cal
1108         );
1109
1110         cprintf("000\n");
1111         getroom(&CC->room, hold_rm);    /* return to saved room */
1112
1113 }
1114
1115
1116
1117 /*
1118  * Hunt for conflicts (Phase 1 -- retrieve the object and call Phase 2)
1119  */
1120 void ical_conflicts(long msgnum, char *partnum) {
1121         struct CtdlMessage *msg = NULL;
1122         struct ical_respond_data ird;
1123
1124         msg = CtdlFetchMessage(msgnum, 1);
1125         if (msg == NULL) {
1126                 cprintf("%d Message %ld not found.\n",
1127                         ERROR + ILLEGAL_VALUE,
1128                         (long)msgnum
1129                 );
1130                 return;
1131         }
1132
1133         memset(&ird, 0, sizeof ird);
1134         strcpy(ird.desired_partnum, partnum);
1135         mime_parser(msg->cm_fields['M'],
1136                 NULL,
1137                 *ical_locate_part,              /* callback function */
1138                 NULL, NULL,
1139                 (void *) &ird,                  /* user data */
1140                 0
1141         );
1142
1143         CtdlFreeMessage(msg);
1144
1145         if (ird.cal != NULL) {
1146                 ical_hunt_for_conflicts(ird.cal);
1147                 icalcomponent_free(ird.cal);
1148                 return;
1149         }
1150         else {
1151                 cprintf("%d No calendar object found\n", ERROR + ROOM_NOT_FOUND);
1152                 return;
1153         }
1154
1155         /* should never get here */
1156 }
1157
1158
1159
1160 /*
1161  * Look for busy time in a VEVENT and add it to the supplied VFREEBUSY.
1162  */
1163 void ical_add_to_freebusy(icalcomponent *fb, icalcomponent *cal) {
1164         icalproperty *p;
1165         icalvalue *v;
1166         struct icalperiodtype my_period;
1167
1168         if (cal == NULL) return;
1169         my_period = icalperiodtype_null_period();
1170
1171         if (icalcomponent_isa(cal) != ICAL_VEVENT_COMPONENT) {
1172                 ical_add_to_freebusy(fb,
1173                         icalcomponent_get_first_component(
1174                                 cal, ICAL_VEVENT_COMPONENT
1175                         )
1176                 );
1177                 return;
1178         }
1179
1180         /* If this event is not opaque, the user isn't publishing it as
1181          * busy time, so don't bother doing anything else.
1182          */
1183         p = icalcomponent_get_first_property(cal, ICAL_TRANSP_PROPERTY);
1184         if (p != NULL) {
1185                 v = icalproperty_get_value(p);
1186                 if (v != NULL) {
1187                         if (icalvalue_get_transp(v) != ICAL_TRANSP_OPAQUE) {
1188                                 return;
1189                         }
1190                 }
1191         }
1192
1193         /* Convert the DTSTART and DTEND properties to an icalperiod. */
1194         p = icalcomponent_get_first_property(cal, ICAL_DTSTART_PROPERTY);
1195         if (p != NULL) {
1196                 my_period.start = icalproperty_get_dtstart(p);
1197         }
1198
1199         p = icalcomponent_get_first_property(cal, ICAL_DTEND_PROPERTY);
1200         if (p != NULL) {
1201                 my_period.end = icalproperty_get_dtstart(p);
1202         }
1203
1204         /* Now add it. */
1205         icalcomponent_add_property(fb,
1206                 icalproperty_new_freebusy(my_period)
1207         );
1208
1209         /* Make sure the DTSTART property of the freebusy *list* is set to
1210          * the DTSTART property of the *earliest event*.
1211          */
1212         p = icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY);
1213         if (p == NULL) {
1214                 icalcomponent_set_dtstart(fb,
1215                         icalcomponent_get_dtstart(cal) );
1216         }
1217         else {
1218                 if (icaltime_compare(
1219                         icalcomponent_get_dtstart(cal),
1220                         icalcomponent_get_dtstart(fb)
1221                    ) < 0) {
1222                         icalcomponent_set_dtstart(fb,
1223                                 icalcomponent_get_dtstart(cal) );
1224                 }
1225         }
1226
1227         /* Make sure the DTEND property of the freebusy *list* is set to
1228          * the DTEND property of the *latest event*.
1229          */
1230         p = icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY);
1231         if (p == NULL) {
1232                 icalcomponent_set_dtend(fb,
1233                         icalcomponent_get_dtend(cal) );
1234         }
1235         else {
1236                 if (icaltime_compare(
1237                         icalcomponent_get_dtend(cal),
1238                         icalcomponent_get_dtend(fb)
1239                    ) > 0) {
1240                         icalcomponent_set_dtend(fb,
1241                                 icalcomponent_get_dtend(cal) );
1242                 }
1243         }
1244
1245 }
1246
1247
1248
1249 /*
1250  * Backend for ical_freebusy()
1251  *
1252  * This function simply loads the messages in the user's calendar room,
1253  * which contain VEVENTs, then strips them of all non-freebusy data, and
1254  * adds them to the supplied VCALENDAR.
1255  *
1256  */
1257 void ical_freebusy_backend(long msgnum, void *data) {
1258         icalcomponent *cal;
1259         struct CtdlMessage *msg = NULL;
1260         struct ical_respond_data ird;
1261
1262         cal = (icalcomponent *)data;
1263
1264         msg = CtdlFetchMessage(msgnum, 1);
1265         if (msg == NULL) return;
1266         memset(&ird, 0, sizeof ird);
1267         strcpy(ird.desired_partnum, "_HUNT_");
1268         mime_parser(msg->cm_fields['M'],
1269                 NULL,
1270                 *ical_locate_part,              /* callback function */
1271                 NULL, NULL,
1272                 (void *) &ird,                  /* user data */
1273                 0
1274         );
1275         CtdlFreeMessage(msg);
1276
1277         if (ird.cal == NULL) return;
1278
1279         ical_add_to_freebusy(cal, ird.cal);
1280
1281         /* Now free the memory. */
1282         icalcomponent_free(ird.cal);
1283 }
1284
1285
1286
1287 /*
1288  * Grab another user's free/busy times
1289  */
1290 void ical_freebusy(char *who) {
1291         struct ctdluser usbuf;
1292         char calendar_room_name[ROOMNAMELEN];
1293         char hold_rm[ROOMNAMELEN];
1294         char *serialized_request = NULL;
1295         icalcomponent *encaps = NULL;
1296         icalcomponent *fb = NULL;
1297         int found_user = (-1);
1298         struct recptypes *recp = NULL;
1299         char buf[256];
1300         char host[256];
1301         char type[256];
1302         int i = 0;
1303         int config_lines = 0;
1304
1305         /* First try an exact match. */
1306         found_user = getuser(&usbuf, who);
1307
1308         /* If not found, try it as an unqualified email address. */
1309         if (found_user != 0) {
1310                 strcpy(buf, who);
1311                 recp = validate_recipients(buf, NULL, 0);
1312                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1313                 if (recp != NULL) {
1314                         if (recp->num_local == 1) {
1315                                 found_user = getuser(&usbuf, recp->recp_local);
1316                         }
1317                         free_recipients(recp);
1318                 }
1319         }
1320
1321         /* If still not found, try it as an address qualified with the
1322          * primary FQDN of this Citadel node.
1323          */
1324         if (found_user != 0) {
1325                 snprintf(buf, sizeof buf, "%s@%s", who, config.c_fqdn);
1326                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1327                 recp = validate_recipients(buf, NULL, 0);
1328                 if (recp != NULL) {
1329                         if (recp->num_local == 1) {
1330                                 found_user = getuser(&usbuf, recp->recp_local);
1331                         }
1332                         free_recipients(recp);
1333                 }
1334         }
1335
1336         /* Still not found?  Try qualifying it with every domain we
1337          * might have addresses in.
1338          */
1339         if (found_user != 0) {
1340                 config_lines = num_tokens(inetcfg, '\n');
1341                 for (i=0; ((i < config_lines) && (found_user != 0)); ++i) {
1342                         extract_token(buf, inetcfg, i, '\n', sizeof buf);
1343                         extract_token(host, buf, 0, '|', sizeof host);
1344                         extract_token(type, buf, 1, '|', sizeof type);
1345
1346                         if ( (!strcasecmp(type, "localhost"))
1347                            || (!strcasecmp(type, "directory")) ) {
1348                                 snprintf(buf, sizeof buf, "%s@%s", who, host);
1349                                 CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", buf);
1350                                 recp = validate_recipients(buf, NULL, 0);
1351                                 if (recp != NULL) {
1352                                         if (recp->num_local == 1) {
1353                                                 found_user = getuser(&usbuf, recp->recp_local);
1354                                         }
1355                                         free_recipients(recp);
1356                                 }
1357                         }
1358                 }
1359         }
1360
1361         if (found_user != 0) {
1362                 cprintf("%d No such user.\n", ERROR + NO_SUCH_USER);
1363                 return;
1364         }
1365
1366         MailboxName(calendar_room_name, sizeof calendar_room_name,
1367                 &usbuf, USERCALENDARROOM);
1368
1369         strcpy(hold_rm, CC->room.QRname);       /* save current room */
1370
1371         if (getroom(&CC->room, calendar_room_name) != 0) {
1372                 cprintf("%d Cannot open calendar\n", ERROR + ROOM_NOT_FOUND);
1373                 getroom(&CC->room, hold_rm);
1374                 return;
1375         }
1376
1377         /* Create a VFREEBUSY subcomponent */
1378         CtdlLogPrintf(CTDL_DEBUG, "Creating VFREEBUSY component\n");
1379         fb = icalcomponent_new_vfreebusy();
1380         if (fb == NULL) {
1381                 cprintf("%d Internal error: cannot allocate memory.\n",
1382                         ERROR + INTERNAL_ERROR);
1383                 getroom(&CC->room, hold_rm);
1384                 return;
1385         }
1386
1387         /* Set the method to PUBLISH */
1388         icalcomponent_set_method(fb, ICAL_METHOD_PUBLISH);
1389
1390         /* Set the DTSTAMP to right now. */
1391         icalcomponent_set_dtstamp(fb, icaltime_from_timet(time(NULL), 0));
1392
1393         /* Add the user's email address as ORGANIZER */
1394         sprintf(buf, "MAILTO:%s", who);
1395         if (strchr(buf, '@') == NULL) {
1396                 strcat(buf, "@");
1397                 strcat(buf, config.c_fqdn);
1398         }
1399         for (i=0; buf[i]; ++i) {
1400                 if (buf[i]==' ') buf[i] = '_';
1401         }
1402         icalcomponent_add_property(fb, icalproperty_new_organizer(buf));
1403
1404         /* Add busy time from events */
1405         CtdlLogPrintf(CTDL_DEBUG, "Adding busy time from events\n");
1406         CtdlForEachMessage(MSGS_ALL, 0, NULL, NULL, NULL, ical_freebusy_backend, (void *)fb );
1407
1408         /* If values for DTSTART and DTEND are still not present, set them
1409          * to yesterday and tomorrow as default values.
1410          */
1411         if (icalcomponent_get_first_property(fb, ICAL_DTSTART_PROPERTY) == NULL) {
1412                 icalcomponent_set_dtstart(fb, icaltime_from_timet(time(NULL)-86400L, 0));
1413         }
1414         if (icalcomponent_get_first_property(fb, ICAL_DTEND_PROPERTY) == NULL) {
1415                 icalcomponent_set_dtend(fb, icaltime_from_timet(time(NULL)+86400L, 0));
1416         }
1417
1418         /* Put the freebusy component into the calendar component */
1419         CtdlLogPrintf(CTDL_DEBUG, "Encapsulating\n");
1420         encaps = ical_encapsulate_subcomponent(fb);
1421         if (encaps == NULL) {
1422                 icalcomponent_free(fb);
1423                 cprintf("%d Internal error: cannot allocate memory.\n",
1424                         ERROR + INTERNAL_ERROR);
1425                 getroom(&CC->room, hold_rm);
1426                 return;
1427         }
1428
1429         /* Set the method to PUBLISH */
1430         CtdlLogPrintf(CTDL_DEBUG, "Setting method\n");
1431         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1432
1433         /* Serialize it */
1434         CtdlLogPrintf(CTDL_DEBUG, "Serializing\n");
1435         serialized_request = icalcomponent_as_ical_string_r(encaps);
1436         icalcomponent_free(encaps);     /* Don't need this anymore. */
1437
1438         cprintf("%d Here is the free/busy data:\n", LISTING_FOLLOWS);
1439         if (serialized_request != NULL) {
1440                 client_write(serialized_request, strlen(serialized_request));
1441                 free(serialized_request);
1442         }
1443         cprintf("\n000\n");
1444
1445         /* Go back to the room from which we came... */
1446         getroom(&CC->room, hold_rm);
1447 }
1448
1449
1450
1451 /*
1452  * Backend for ical_getics()
1453  *
1454  * This is a ForEachMessage() callback function that searches the current room
1455  * for calendar events and adds them each into one big calendar component.
1456  */
1457 void ical_getics_backend(long msgnum, void *data) {
1458         icalcomponent *encaps, *c;
1459         struct CtdlMessage *msg = NULL;
1460         struct ical_respond_data ird;
1461
1462         encaps = (icalcomponent *)data;
1463         if (encaps == NULL) return;
1464
1465         /* Look for the calendar event... */
1466
1467         msg = CtdlFetchMessage(msgnum, 1);
1468         if (msg == NULL) return;
1469         memset(&ird, 0, sizeof ird);
1470         strcpy(ird.desired_partnum, "_HUNT_");
1471         mime_parser(msg->cm_fields['M'],
1472                 NULL,
1473                 *ical_locate_part,              /* callback function */
1474                 NULL, NULL,
1475                 (void *) &ird,                  /* user data */
1476                 0
1477         );
1478         CtdlFreeMessage(msg);
1479
1480         if (ird.cal == NULL) return;
1481
1482         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1483          * are responsible for "the_request"'s memory -- it will be freed
1484          * when we free "encaps".
1485          */
1486
1487         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1488          * in.  This will almost never happen.
1489          */
1490         if (icalcomponent_isa(ird.cal) != ICAL_VCALENDAR_COMPONENT) {
1491                 icalcomponent_add_component(encaps, ird.cal);
1492         }
1493         /*
1494          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1495          * and other components encapsulated inside, we have to extract them.
1496          */
1497         else {
1498                 for (c = icalcomponent_get_first_component(ird.cal, ICAL_ANY_COMPONENT);
1499                     (c != NULL);
1500                     c = icalcomponent_get_next_component(ird.cal, ICAL_ANY_COMPONENT)) {
1501                         icalcomponent_add_component(encaps, icalcomponent_new_clone(c));
1502                 }
1503                 icalcomponent_free(ird.cal);
1504         }
1505 }
1506
1507
1508
1509 /*
1510  * Retrieve all of the calendar items in the current room, and output them
1511  * as a single icalendar object.
1512  */
1513 void ical_getics(void)
1514 {
1515         icalcomponent *encaps = NULL;
1516         char *ser = NULL;
1517
1518         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1519            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1520                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1521                 return;         /* Not an iCalendar-centric room */
1522         }
1523
1524         encaps = icalcomponent_new_vcalendar();
1525         if (encaps == NULL) {
1526                 CtdlLogPrintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1527                         __FILE__, __LINE__);
1528                 cprintf("%d Could not allocate memory\n", ERROR+INTERNAL_ERROR);
1529                 return;
1530         }
1531
1532         cprintf("%d one big calendar\n", LISTING_FOLLOWS);
1533
1534         /* Set the Product ID */
1535         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1536
1537         /* Set the Version Number */
1538         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1539
1540         /* Set the method to PUBLISH */
1541         icalcomponent_set_method(encaps, ICAL_METHOD_PUBLISH);
1542
1543         /* Now go through the room encapsulating all calendar items. */
1544         CtdlForEachMessage(MSGS_ALL, 0, NULL,
1545                 NULL,
1546                 NULL,
1547                 ical_getics_backend,
1548                 (void *) encaps
1549         );
1550
1551         ser = icalcomponent_as_ical_string_r(encaps);
1552         client_write(ser, strlen(ser));
1553         free(ser);
1554         cprintf("\n000\n");
1555         icalcomponent_free(encaps);     /* Don't need this anymore. */
1556
1557 }
1558
1559
1560 /*
1561  * Delete all of the calendar items in the current room, and replace them
1562  * with calendar items from a client-supplied data stream.
1563  */
1564 void ical_putics(void)
1565 {
1566         char *calstream = NULL;
1567         icalcomponent *cal;
1568         icalcomponent *c;
1569
1570         if ( (CC->room.QRdefaultview != VIEW_CALENDAR)
1571            &&(CC->room.QRdefaultview != VIEW_TASKS) ) {
1572                 cprintf("%d Not a calendar room\n", ERROR+NOT_HERE);
1573                 return;         /* Not an iCalendar-centric room */
1574         }
1575
1576         if (!CtdlDoIHavePermissionToDeleteMessagesFromThisRoom()) {
1577                 cprintf("%d Permission denied.\n", ERROR+HIGHER_ACCESS_REQUIRED);
1578                 return;
1579         }
1580
1581         cprintf("%d Transmit data now\n", SEND_LISTING);
1582         calstream = CtdlReadMessageBody("000", config.c_maxmsglen, NULL, 0, 0);
1583         if (calstream == NULL) {
1584                 return;
1585         }
1586
1587         cal = icalcomponent_new_from_string(calstream);
1588         free(calstream);
1589
1590         /* We got our data stream -- now do something with it. */
1591
1592         /* Delete the existing messages in the room, because we are replacing
1593          * the entire calendar with an entire new (or updated) calendar.
1594          * (Careful: this opens an S_ROOMS critical section!)
1595          */
1596         CtdlDeleteMessages(CC->room.QRname, NULL, 0, "");
1597
1598         /* If the top-level component is *not* a VCALENDAR, we can drop it right
1599          * in.  This will almost never happen.
1600          */
1601         if (icalcomponent_isa(cal) != ICAL_VCALENDAR_COMPONENT) {
1602                 ical_write_to_cal(NULL, cal);
1603         }
1604         /*
1605          * In the more likely event that we're looking at a VCALENDAR with the VEVENT
1606          * and other components encapsulated inside, we have to extract them.
1607          */
1608         else {
1609                 for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1610                     (c != NULL);
1611                     c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1612                         ical_write_to_cal(NULL, c);
1613                 }
1614         }
1615
1616         icalcomponent_free(cal);
1617 }
1618
1619
1620 /*
1621  * All Citadel calendar commands from the client come through here.
1622  */
1623 void cmd_ical(char *argbuf)
1624 {
1625         char subcmd[64];
1626         long msgnum;
1627         char partnum[256];
1628         char action[256];
1629         char who[256];
1630
1631         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
1632
1633         /* Allow "test" and "freebusy" subcommands without logging in. */
1634
1635         if (!strcasecmp(subcmd, "test")) {
1636                 cprintf("%d This server supports calendaring\n", CIT_OK);
1637                 return;
1638         }
1639
1640         if (!strcasecmp(subcmd, "freebusy")) {
1641                 extract_token(who, argbuf, 1, '|', sizeof who);
1642                 ical_freebusy(who);
1643                 return;
1644         }
1645
1646         if (!strcasecmp(subcmd, "sgi")) {
1647                 CIT_ICAL->server_generated_invitations =
1648                         (extract_int(argbuf, 1) ? 1 : 0) ;
1649                 cprintf("%d %d\n",
1650                         CIT_OK, CIT_ICAL->server_generated_invitations);
1651                 return;
1652         }
1653
1654         if (CtdlAccessCheck(ac_logged_in)) return;
1655
1656         if (!strcasecmp(subcmd, "respond")) {
1657                 msgnum = extract_long(argbuf, 1);
1658                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1659                 extract_token(action, argbuf, 3, '|', sizeof action);
1660                 ical_respond(msgnum, partnum, action);
1661                 return;
1662         }
1663
1664         if (!strcasecmp(subcmd, "handle_rsvp")) {
1665                 msgnum = extract_long(argbuf, 1);
1666                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1667                 extract_token(action, argbuf, 3, '|', sizeof action);
1668                 ical_handle_rsvp(msgnum, partnum, action);
1669                 return;
1670         }
1671
1672         if (!strcasecmp(subcmd, "conflicts")) {
1673                 msgnum = extract_long(argbuf, 1);
1674                 extract_token(partnum, argbuf, 2, '|', sizeof partnum);
1675                 ical_conflicts(msgnum, partnum);
1676                 return;
1677         }
1678
1679         if (!strcasecmp(subcmd, "getics")) {
1680                 ical_getics();
1681                 return;
1682         }
1683
1684         if (!strcasecmp(subcmd, "putics")) {
1685                 ical_putics();
1686                 return;
1687         }
1688
1689         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
1690 }
1691
1692
1693
1694 /*
1695  * We don't know if the calendar room exists so we just create it at login
1696  */
1697 void ical_create_room(void)
1698 {
1699         struct ctdlroom qr;
1700         struct visit vbuf;
1701
1702         /* Create the calendar room if it doesn't already exist */
1703         create_room(USERCALENDARROOM, 4, "", 0, 1, 0, VIEW_CALENDAR);
1704
1705         /* Set expiration policy to manual; otherwise objects will be lost! */
1706         if (lgetroom(&qr, USERCALENDARROOM)) {
1707                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1708                 return;
1709         }
1710         qr.QRep.expire_mode = EXPIRE_MANUAL;
1711         qr.QRdefaultview = VIEW_CALENDAR;       /* 3 = calendar view */
1712         lputroom(&qr);
1713
1714         /* Set the view to a calendar view */
1715         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1716         vbuf.v_view = VIEW_CALENDAR;
1717         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1718
1719         /* Create the tasks list room if it doesn't already exist */
1720         create_room(USERTASKSROOM, 4, "", 0, 1, 0, VIEW_TASKS);
1721
1722         /* Set expiration policy to manual; otherwise objects will be lost! */
1723         if (lgetroom(&qr, USERTASKSROOM)) {
1724                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1725                 return;
1726         }
1727         qr.QRep.expire_mode = EXPIRE_MANUAL;
1728         qr.QRdefaultview = VIEW_TASKS;
1729         lputroom(&qr);
1730
1731         /* Set the view to a task list view */
1732         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1733         vbuf.v_view = VIEW_TASKS;
1734         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1735
1736         /* Create the notes room if it doesn't already exist */
1737         create_room(USERNOTESROOM, 4, "", 0, 1, 0, VIEW_NOTES);
1738
1739         /* Set expiration policy to manual; otherwise objects will be lost! */
1740         if (lgetroom(&qr, USERNOTESROOM)) {
1741                 CtdlLogPrintf(CTDL_CRIT, "Couldn't get the user calendar room!\n");
1742                 return;
1743         }
1744         qr.QRep.expire_mode = EXPIRE_MANUAL;
1745         qr.QRdefaultview = VIEW_NOTES;
1746         lputroom(&qr);
1747
1748         /* Set the view to a notes view */
1749         CtdlGetRelationship(&vbuf, &CC->user, &qr);
1750         vbuf.v_view = VIEW_NOTES;
1751         CtdlSetRelationship(&vbuf, &CC->user, &qr);
1752
1753         return;
1754 }
1755
1756
1757 /*
1758  * ical_send_out_invitations() is called by ical_saving_vevent() when it
1759  * finds a VEVENT.
1760  */
1761 void ical_send_out_invitations(icalcomponent *cal) {
1762         icalcomponent *the_request = NULL;
1763         char *serialized_request = NULL;
1764         icalcomponent *encaps = NULL;
1765         char *request_message_text = NULL;
1766         struct CtdlMessage *msg = NULL;
1767         struct recptypes *valid = NULL;
1768         char attendees_string[SIZ];
1769         int num_attendees = 0;
1770         char this_attendee[256];
1771         icalproperty *attendee = NULL;
1772         char summary_string[SIZ];
1773         icalproperty *summary = NULL;
1774         size_t reqsize;
1775
1776         if (cal == NULL) {
1777                 CtdlLogPrintf(CTDL_ERR, "ERROR: trying to reply to NULL event?\n");
1778                 return;
1779         }
1780
1781
1782         /* If this is a VCALENDAR component, look for a VEVENT subcomponent. */
1783         if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1784                 ical_send_out_invitations(
1785                         icalcomponent_get_first_component(
1786                                 cal, ICAL_VEVENT_COMPONENT
1787                         )
1788                 );
1789                 return;
1790         }
1791
1792         /* Clone the event */
1793         the_request = icalcomponent_new_clone(cal);
1794         if (the_request == NULL) {
1795                 CtdlLogPrintf(CTDL_ERR, "ERROR: cannot clone calendar object\n");
1796                 return;
1797         }
1798
1799         /* Extract the summary string -- we'll use it as the
1800          * message subject for the request
1801          */
1802         strcpy(summary_string, "Meeting request");
1803         summary = icalcomponent_get_first_property(the_request, ICAL_SUMMARY_PROPERTY);
1804         if (summary != NULL) {
1805                 if (icalproperty_get_summary(summary)) {
1806                         strcpy(summary_string,
1807                                 icalproperty_get_summary(summary) );
1808                 }
1809         }
1810
1811         /* Determine who the recipients of this message are (the attendees) */
1812         strcpy(attendees_string, "");
1813         for (attendee = icalcomponent_get_first_property(the_request, ICAL_ATTENDEE_PROPERTY); attendee != NULL; attendee = icalcomponent_get_next_property(the_request, ICAL_ATTENDEE_PROPERTY)) {
1814                 if (icalproperty_get_attendee(attendee)) {
1815                         safestrncpy(this_attendee, icalproperty_get_attendee(attendee), sizeof this_attendee);
1816                         if (!strncasecmp(this_attendee, "MAILTO:", 7)) {
1817                                 strcpy(this_attendee, &this_attendee[7]);
1818
1819                                 if (!CtdlIsMe(this_attendee, sizeof this_attendee)) {   /* don't send an invitation to myself! */
1820                                         snprintf(&attendees_string[strlen(attendees_string)],
1821                                                 sizeof(attendees_string) - strlen(attendees_string),
1822                                                 "%s, ",
1823                                                 this_attendee
1824                                         );
1825                                         ++num_attendees;
1826                                 }
1827                         }
1828                 }
1829         }
1830
1831         CtdlLogPrintf(CTDL_DEBUG, "<%d> attendees: <%s>\n", num_attendees, attendees_string);
1832
1833         /* If there are no attendees, there are no invitations to send, so...
1834          * don't bother putting one together!  Punch out, Maverick!
1835          */
1836         if (num_attendees == 0) {
1837                 icalcomponent_free(the_request);
1838                 return;
1839         }
1840
1841         /* Encapsulate the VEVENT component into a complete VCALENDAR */
1842         encaps = icalcomponent_new_vcalendar();
1843         if (encaps == NULL) {
1844                 CtdlLogPrintf(CTDL_DEBUG, "Error at %s:%d - could not allocate component!\n",
1845                         __FILE__, __LINE__);
1846                 icalcomponent_free(the_request);
1847                 return;
1848         }
1849
1850         /* Set the Product ID */
1851         icalcomponent_add_property(encaps, icalproperty_new_prodid(PRODID));
1852
1853         /* Set the Version Number */
1854         icalcomponent_add_property(encaps, icalproperty_new_version("2.0"));
1855
1856         /* Set the method to REQUEST */
1857         icalcomponent_set_method(encaps, ICAL_METHOD_REQUEST);
1858
1859         /* Here we go: put the VEVENT into the VCALENDAR.  We now no longer
1860          * are responsible for "the_request"'s memory -- it will be freed
1861          * when we free "encaps".
1862          */
1863         icalcomponent_add_component(encaps, the_request);
1864
1865         /* Serialize it */
1866         serialized_request = icalcomponent_as_ical_string_r(encaps);
1867         icalcomponent_free(encaps);     /* Don't need this anymore. */
1868         if (serialized_request == NULL) return;
1869
1870         reqsize = strlen(serialized_request) + SIZ;
1871         request_message_text = malloc(reqsize);
1872         if (request_message_text != NULL) {
1873                 snprintf(request_message_text, reqsize,
1874                         "Content-type: text/calendar\r\n\r\n%s\r\n",
1875                         serialized_request
1876                 );
1877
1878                 msg = CtdlMakeMessage(&CC->user,
1879                         "",                     /* No single recipient here */
1880                         "",                     /* No single recipient here */
1881                         CC->room.QRname, 0, FMT_RFC822,
1882                         "",
1883                         "",
1884                         summary_string,         /* Use summary for subject */
1885                         NULL,
1886                         request_message_text,
1887                         NULL);
1888
1889                 if (msg != NULL) {
1890                         valid = validate_recipients(attendees_string, NULL, 0);
1891                         CtdlSubmitMsg(msg, valid, "", QP_EADDR);
1892                         CtdlFreeMessage(msg);
1893                         free_recipients(valid);
1894                 }
1895         }
1896         free(serialized_request);
1897 }
1898
1899
1900 /*
1901  * When a calendar object is being saved, determine whether it's a VEVENT
1902  * and the user saving it is the organizer.  If so, send out invitations
1903  * to any listed attendees.
1904  *
1905  */
1906 void ical_saving_vevent(icalcomponent *cal) {
1907         icalcomponent *c;
1908         icalproperty *organizer = NULL;
1909         char organizer_string[SIZ];
1910
1911         CtdlLogPrintf(CTDL_DEBUG, "ical_saving_vevent() has been called!\n");
1912
1913         /* Don't send out invitations unless the client wants us to. */
1914         if (CIT_ICAL->server_generated_invitations == 0) {
1915                 return;
1916         }
1917
1918         /* Don't send out invitations if we've been asked not to. */
1919         if (CIT_ICAL->avoid_sending_invitations > 0) {
1920                 return;
1921         }
1922
1923         strcpy(organizer_string, "");
1924         /*
1925          * The VEVENT subcomponent is the one we're interested in.
1926          * Send out invitations if, and only if, this user is the Organizer.
1927          */
1928         if (icalcomponent_isa(cal) == ICAL_VEVENT_COMPONENT) {
1929                 organizer = icalcomponent_get_first_property(cal, ICAL_ORGANIZER_PROPERTY);
1930                 if (organizer != NULL) {
1931                         if (icalproperty_get_organizer(organizer)) {
1932                                 strcpy(organizer_string,
1933                                         icalproperty_get_organizer(organizer));
1934                         }
1935                 }
1936                 if (!strncasecmp(organizer_string, "MAILTO:", 7)) {
1937                         strcpy(organizer_string, &organizer_string[7]);
1938                         striplt(organizer_string);
1939                         /*
1940                          * If the user saving the event is listed as the
1941                          * organizer, then send out invitations.
1942                          */
1943                         if (CtdlIsMe(organizer_string, sizeof organizer_string)) {
1944                                 ical_send_out_invitations(cal);
1945                         }
1946                 }
1947         }
1948
1949         /* If the component has subcomponents, recurse through them. */
1950         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
1951             (c != NULL);
1952             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
1953                 /* Recursively process subcomponent */
1954                 ical_saving_vevent(c);
1955         }
1956
1957 }
1958
1959
1960
1961 /*
1962  * Back end for ical_obj_beforesave()
1963  * This hunts for the UID of the calendar event (becomes Citadel msg EUID),
1964  * the summary of the event (becomes message subject),
1965  * and the start time (becomes message date/time).
1966  */
1967 void ical_obj_beforesave_backend(char *name, char *filename, char *partnum,
1968                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
1969                 char *encoding, char *cbid, void *cbuserdata)
1970 {
1971         icalcomponent *cal, *nested_event, *nested_todo, *whole_cal;
1972         icalproperty *p;
1973         char new_uid[256] = "";
1974         char buf[1024] = "";
1975         struct CtdlMessage *msg = (struct CtdlMessage *) cbuserdata;
1976
1977         if (!msg) return;
1978
1979         /* We're only interested in calendar data. */
1980         if (  (strcasecmp(cbtype, "text/calendar"))
1981            && (strcasecmp(cbtype, "application/ics")) ) {
1982                 return;
1983         }
1984
1985         /* Hunt for the UID and drop it in
1986          * the "user data" pointer for the MIME parser.  When
1987          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
1988          * to that string.
1989          */
1990         whole_cal = icalcomponent_new_from_string(content);
1991         cal = whole_cal;
1992         if (cal != NULL) {
1993                 if (icalcomponent_isa(cal) == ICAL_VCALENDAR_COMPONENT) {
1994                         nested_event = icalcomponent_get_first_component(
1995                                 cal, ICAL_VEVENT_COMPONENT);
1996                         if (nested_event != NULL) {
1997                                 cal = nested_event;
1998                         }
1999                         else {
2000                                 nested_todo = icalcomponent_get_first_component(
2001                                         cal, ICAL_VTODO_COMPONENT);
2002                                 if (nested_todo != NULL) {
2003                                         cal = nested_todo;
2004                                 }
2005                         }
2006                 }
2007
2008                 if (cal != NULL) {
2009
2010                         /* Set the message EUID to the iCalendar UID */
2011
2012                         p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2013                         if (p == NULL) {
2014                                 /* If there's no uid we must generate one */
2015                                 generate_uuid(new_uid);
2016                                 icalcomponent_add_property(cal, icalproperty_new_uid(new_uid));
2017                                 p = ical_ctdl_get_subprop(cal, ICAL_UID_PROPERTY);
2018                         }
2019                         if (p != NULL) {
2020                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2021                                 if (!IsEmptyStr(buf)) {
2022                                         if (msg->cm_fields['E'] != NULL) {
2023                                                 free(msg->cm_fields['E']);
2024                                         }
2025                                         msg->cm_fields['E'] = strdup(buf);
2026                                         CtdlLogPrintf(CTDL_DEBUG, "Saving calendar UID <%s>\n", buf);
2027                                 }
2028                         }
2029
2030                         /* Set the message subject to the iCalendar summary */
2031
2032                         p = ical_ctdl_get_subprop(cal, ICAL_SUMMARY_PROPERTY);
2033                         if (p != NULL) {
2034                                 safestrncpy(buf, icalproperty_get_comment(p), sizeof buf);
2035                                 if (!IsEmptyStr(buf)) {
2036                                         if (msg->cm_fields['U'] != NULL) {
2037                                                 free(msg->cm_fields['U']);
2038                                         }
2039                                         msg->cm_fields['U'] = strdup(buf);
2040                                 }
2041                         }
2042
2043                         /* Set the message date/time to the iCalendar start time */
2044
2045                         p = ical_ctdl_get_subprop(cal, ICAL_DTSTART_PROPERTY);
2046                         if (p != NULL) {
2047                                 time_t idtstart;
2048                                 idtstart = icaltime_as_timet(icalproperty_get_dtstart(p));
2049                                 if (idtstart > 0) {
2050                                         if (msg->cm_fields['T'] != NULL) {
2051                                                 free(msg->cm_fields['T']);
2052                                         }
2053                                         msg->cm_fields['T'] = strdup("000000000000000000");
2054                                         sprintf(msg->cm_fields['T'], "%ld", idtstart);
2055                                 }
2056                         }
2057
2058                 }
2059                 icalcomponent_free(cal);
2060                 if (whole_cal != cal) {
2061                         icalcomponent_free(whole_cal);
2062                 }
2063         }
2064 }
2065
2066
2067
2068
2069 /*
2070  * See if we need to prevent the object from being saved (we don't allow
2071  * MIME types other than text/calendar in "calendar" or "tasks" rooms).
2072  *
2073  * If the message is being saved, we also set various message header fields
2074  * using data found in the iCalendar object.
2075  */
2076 int ical_obj_beforesave(struct CtdlMessage *msg)
2077 {
2078         /* First determine if this is a calendar or tasks room */
2079         if (  (CC->room.QRdefaultview != VIEW_CALENDAR)
2080            && (CC->room.QRdefaultview != VIEW_TASKS)
2081         ) {
2082                 return(0);              /* Not an iCalendar-centric room */
2083         }
2084
2085         /* It must be an RFC822 message! */
2086         if (msg->cm_format_type != 4) {
2087                 CtdlLogPrintf(CTDL_DEBUG, "Rejecting non-RFC822 message\n");
2088                 return(1);              /* You tried to save a non-RFC822 message! */
2089         }
2090
2091         if (msg->cm_fields['M'] == NULL) {
2092                 return(1);              /* You tried to save a null message! */
2093         }
2094
2095         /* Do all of our lovely back-end parsing */
2096         mime_parser(msg->cm_fields['M'],
2097                 NULL,
2098                 *ical_obj_beforesave_backend,
2099                 NULL, NULL,
2100                 (void *)msg,
2101                 0
2102         );
2103
2104         return(0);
2105 }
2106
2107
2108 /*
2109  * Things we need to do after saving a calendar event.
2110  */
2111 void ical_obj_aftersave_backend(char *name, char *filename, char *partnum,
2112                 char *disp, void *content, char *cbtype, char *cbcharset, size_t length,
2113                 char *encoding, char *cbid, void *cbuserdata)
2114 {
2115         icalcomponent *cal;
2116
2117         /* We're only interested in calendar items here. */
2118         if (  (strcasecmp(cbtype, "text/calendar"))
2119            && (strcasecmp(cbtype, "application/ics")) ) {
2120                 return;
2121         }
2122
2123         /* Hunt for the UID and drop it in
2124          * the "user data" pointer for the MIME parser.  When
2125          * ical_obj_beforesave() sees it there, it'll set the Exclusive msgid
2126          * to that string.
2127          */
2128         if (  (!strcasecmp(cbtype, "text/calendar"))
2129            || (!strcasecmp(cbtype, "application/ics")) ) {
2130                 cal = icalcomponent_new_from_string(content);
2131                 if (cal != NULL) {
2132                         ical_saving_vevent(cal);
2133                         icalcomponent_free(cal);
2134                 }
2135         }
2136 }
2137
2138
2139 /*
2140  * Things we need to do after saving a calendar event.
2141  * (This will start back end tasks such as automatic generation of invitations,
2142  * if such actions are appropriate.)
2143  */
2144 int ical_obj_aftersave(struct CtdlMessage *msg)
2145 {
2146         char roomname[ROOMNAMELEN];
2147
2148         /*
2149          * If this isn't the Calendar> room, no further action is necessary.
2150          */
2151
2152         /* First determine if this is our room */
2153         MailboxName(roomname, sizeof roomname, &CC->user, USERCALENDARROOM);
2154         if (strcasecmp(roomname, CC->room.QRname)) {
2155                 return(0);      /* Not the Calendar room -- don't do anything. */
2156         }
2157
2158         /* It must be an RFC822 message! */
2159         if (msg->cm_format_type != 4) return(1);
2160
2161         /* Reject null messages */
2162         if (msg->cm_fields['M'] == NULL) return(1);
2163
2164         /* Now recurse through it looking for our icalendar data */
2165         mime_parser(msg->cm_fields['M'],
2166                 NULL,
2167                 *ical_obj_aftersave_backend,
2168                 NULL, NULL,
2169                 NULL,
2170                 0
2171         );
2172
2173         return(0);
2174 }
2175
2176
2177 void ical_session_startup(void) {
2178         CIT_ICAL = malloc(sizeof(struct cit_ical));
2179         memset(CIT_ICAL, 0, sizeof(struct cit_ical));
2180 }
2181
2182 void ical_session_shutdown(void) {
2183         free(CIT_ICAL);
2184 }
2185
2186
2187 /*
2188  * Back end for ical_fixed_output()
2189  */
2190 void ical_fixed_output_backend(icalcomponent *cal,
2191                         int recursion_level
2192 ) {
2193         icalcomponent *c;
2194         icalproperty *p;
2195         char buf[256];
2196
2197         p = icalcomponent_get_first_property(cal, ICAL_SUMMARY_PROPERTY);
2198         if (p != NULL) {
2199                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2200         }
2201
2202         p = icalcomponent_get_first_property(cal, ICAL_LOCATION_PROPERTY);
2203         if (p != NULL) {
2204                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2205         }
2206
2207         p = icalcomponent_get_first_property(cal, ICAL_DESCRIPTION_PROPERTY);
2208         if (p != NULL) {
2209                 cprintf("%s\n", (const char *)icalproperty_get_comment(p));
2210         }
2211
2212         /* If the component has attendees, iterate through them. */
2213         for (p = icalcomponent_get_first_property(cal, ICAL_ATTENDEE_PROPERTY); (p != NULL); p = icalcomponent_get_next_property(cal, ICAL_ATTENDEE_PROPERTY)) {
2214                 safestrncpy(buf, icalproperty_get_attendee(p), sizeof buf);
2215                 if (!strncasecmp(buf, "MAILTO:", 7)) {
2216
2217                         /* screen name or email address */
2218                         strcpy(buf, &buf[7]);
2219                         striplt(buf);
2220                         cprintf("%s ", buf);
2221                 }
2222                 cprintf("\n");
2223         }
2224
2225         /* If the component has subcomponents, recurse through them. */
2226         for (c = icalcomponent_get_first_component(cal, ICAL_ANY_COMPONENT);
2227             (c != 0);
2228             c = icalcomponent_get_next_component(cal, ICAL_ANY_COMPONENT)) {
2229                 /* Recursively process subcomponent */
2230                 ical_fixed_output_backend(c, recursion_level+1);
2231         }
2232 }
2233
2234
2235
2236 /*
2237  * Function to output iCalendar data as plain text.  Nobody uses MSG0
2238  * anymore, so really this is just so we expose the vCard data to the full
2239  * text indexer.
2240  */
2241 void ical_fixed_output(char *ptr, int len) {
2242         icalcomponent *cal;
2243         char *stringy_cal;
2244
2245         stringy_cal = malloc(len + 1);
2246         safestrncpy(stringy_cal, ptr, len + 1);
2247         cal = icalcomponent_new_from_string(stringy_cal);
2248         free(stringy_cal);
2249
2250         if (cal == NULL) {
2251                 return;
2252         }
2253
2254         ical_fixed_output_backend(cal, 0);
2255
2256         /* Free the memory we obtained from libical's constructor */
2257         icalcomponent_free(cal);
2258 }
2259
2260
2261
2262 void serv_calendar_destroy(void)
2263 {
2264         icaltimezone_free_builtin_timezones();
2265 }
2266
2267 /*
2268  * Register this module with the Citadel server.
2269  */
2270 CTDL_MODULE_INIT(calendar)
2271 {
2272         if (!threading)
2273         {
2274
2275                 /* Tell libical to return errors instead of aborting if it gets bad data */
2276                 icalerror_errors_are_fatal = 0;
2277
2278                 /* Use our own application prefix in tzid's generated from system tzdata */
2279                 icaltimezone_set_tzid_prefix("/citadel.org/");
2280
2281                 /* Initialize our hook functions */
2282                 CtdlRegisterMessageHook(ical_obj_beforesave, EVT_BEFORESAVE);
2283                 CtdlRegisterMessageHook(ical_obj_aftersave, EVT_AFTERSAVE);
2284                 CtdlRegisterSessionHook(ical_create_room, EVT_LOGIN);
2285                 CtdlRegisterProtoHook(cmd_ical, "ICAL", "Citadel iCal commands");
2286                 CtdlRegisterSessionHook(ical_session_startup, EVT_START);
2287                 CtdlRegisterSessionHook(ical_session_shutdown, EVT_STOP);
2288                 CtdlRegisterFixedOutputHook("text/calendar", ical_fixed_output);
2289                 CtdlRegisterFixedOutputHook("application/ics", ical_fixed_output);
2290                 CtdlRegisterCleanupHook(serv_calendar_destroy);
2291         }
2292
2293         /* return our Subversion id for the Log */
2294         return "$Id$";
2295 }
2296